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[bpt/emacs.git] / src / process.c
1 /* Asynchronous subprocess control for GNU Emacs.
2 Copyright (C) 1985, 86, 87, 88, 93, 94, 95, 96, 1998
3 Free Software Foundation, Inc.
4
5 This file is part of GNU Emacs.
6
7 GNU Emacs is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
10 any later version.
11
12 GNU Emacs is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with GNU Emacs; see the file COPYING. If not, write to
19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
21
22
23 #include <signal.h>
24
25 #include <config.h>
26
27 /* This file is split into two parts by the following preprocessor
28 conditional. The 'then' clause contains all of the support for
29 asynchronous subprocesses. The 'else' clause contains stub
30 versions of some of the asynchronous subprocess routines that are
31 often called elsewhere in Emacs, so we don't have to #ifdef the
32 sections that call them. */
33
34 \f
35 #ifdef subprocesses
36
37 #include <stdio.h>
38 #include <errno.h>
39 #include <setjmp.h>
40 #include <sys/types.h> /* some typedefs are used in sys/file.h */
41 #include <sys/file.h>
42 #include <sys/stat.h>
43 #ifdef HAVE_UNISTD_H
44 #include <unistd.h>
45 #endif
46
47 #ifdef WINDOWSNT
48 #include <stdlib.h>
49 #include <fcntl.h>
50 #endif /* not WINDOWSNT */
51
52 #ifdef HAVE_SOCKETS /* TCP connection support, if kernel can do it */
53 #include <sys/socket.h>
54 #include <netdb.h>
55 #include <netinet/in.h>
56 #include <arpa/inet.h>
57 #ifdef NEED_NET_ERRNO_H
58 #include <net/errno.h>
59 #endif /* NEED_NET_ERRNO_H */
60 #endif /* HAVE_SOCKETS */
61
62 /* TERM is a poor-man's SLIP, used on Linux. */
63 #ifdef TERM
64 #include <client.h>
65 #endif
66
67 /* On some systems, e.g. DGUX, inet_addr returns a 'struct in_addr'. */
68 #ifdef HAVE_BROKEN_INET_ADDR
69 #define IN_ADDR struct in_addr
70 #define NUMERIC_ADDR_ERROR (numeric_addr.s_addr == -1)
71 #else
72 #define IN_ADDR unsigned long
73 #define NUMERIC_ADDR_ERROR (numeric_addr == -1)
74 #endif
75
76 #if defined(BSD_SYSTEM) || defined(STRIDE)
77 #include <sys/ioctl.h>
78 #if !defined (O_NDELAY) && defined (HAVE_PTYS) && !defined(USG5)
79 #include <fcntl.h>
80 #endif /* HAVE_PTYS and no O_NDELAY */
81 #endif /* BSD_SYSTEM || STRIDE */
82
83 #ifdef BROKEN_O_NONBLOCK
84 #undef O_NONBLOCK
85 #endif /* BROKEN_O_NONBLOCK */
86
87 #ifdef NEED_BSDTTY
88 #include <bsdtty.h>
89 #endif
90
91 #ifdef IRIS
92 #include <sys/sysmacros.h> /* for "minor" */
93 #endif /* not IRIS */
94
95 #include "systime.h"
96 #include "systty.h"
97
98 #include "lisp.h"
99 #include "window.h"
100 #include "buffer.h"
101 #include "charset.h"
102 #include "coding.h"
103 #include "process.h"
104 #include "termhooks.h"
105 #include "termopts.h"
106 #include "commands.h"
107 #include "frame.h"
108 #include "blockinput.h"
109 #include "keyboard.h"
110 #include "dispextern.h"
111
112 #define max(a, b) ((a) > (b) ? (a) : (b))
113
114 Lisp_Object Qprocessp;
115 Lisp_Object Qrun, Qstop, Qsignal, Qopen, Qclosed;
116 Lisp_Object Qlast_nonmenu_event;
117 /* Qexit is declared and initialized in eval.c. */
118
119 /* a process object is a network connection when its childp field is neither
120 Qt nor Qnil but is instead a cons cell (HOSTNAME PORTNUM). */
121
122 #ifdef HAVE_SOCKETS
123 #define NETCONN_P(p) (GC_CONSP (XPROCESS (p)->childp))
124 #else
125 #define NETCONN_P(p) 0
126 #endif /* HAVE_SOCKETS */
127
128 /* Define first descriptor number available for subprocesses. */
129 #ifdef VMS
130 #define FIRST_PROC_DESC 1
131 #else /* Not VMS */
132 #define FIRST_PROC_DESC 3
133 #endif
134
135 /* Define SIGCHLD as an alias for SIGCLD. There are many conditionals
136 testing SIGCHLD. */
137
138 #if !defined (SIGCHLD) && defined (SIGCLD)
139 #define SIGCHLD SIGCLD
140 #endif /* SIGCLD */
141
142 #include "syssignal.h"
143
144 #include "syswait.h"
145
146 extern int errno;
147 extern char *strerror ();
148 #ifdef VMS
149 extern char *sys_errlist[];
150 #endif
151
152 #ifndef HAVE_H_ERRNO
153 extern int h_errno;
154 #endif
155
156 #ifndef SYS_SIGLIST_DECLARED
157 #ifndef VMS
158 #ifndef BSD4_1
159 #ifndef WINDOWSNT
160 #ifndef LINUX
161 extern char *sys_siglist[];
162 #endif /* not LINUX */
163 #else /* BSD4_1 */
164 char *sys_siglist[] =
165 {
166 "bum signal!!",
167 "hangup",
168 "interrupt",
169 "quit",
170 "illegal instruction",
171 "trace trap",
172 "iot instruction",
173 "emt instruction",
174 "floating point exception",
175 "kill",
176 "bus error",
177 "segmentation violation",
178 "bad argument to system call",
179 "write on a pipe with no one to read it",
180 "alarm clock",
181 "software termination signal from kill",
182 "status signal",
183 "sendable stop signal not from tty",
184 "stop signal from tty",
185 "continue a stopped process",
186 "child status has changed",
187 "background read attempted from control tty",
188 "background write attempted from control tty",
189 "input record available at control tty",
190 "exceeded CPU time limit",
191 "exceeded file size limit"
192 };
193 #endif /* not WINDOWSNT */
194 #endif
195 #endif /* VMS */
196 #endif /* ! SYS_SIGLIST_DECLARED */
197
198 /* t means use pty, nil means use a pipe,
199 maybe other values to come. */
200 static Lisp_Object Vprocess_connection_type;
201
202 #ifdef SKTPAIR
203 #ifndef HAVE_SOCKETS
204 #include <sys/socket.h>
205 #endif
206 #endif /* SKTPAIR */
207
208 /* These next two vars are non-static since sysdep.c uses them in the
209 emulation of `select'. */
210 /* Number of events of change of status of a process. */
211 int process_tick;
212 /* Number of events for which the user or sentinel has been notified. */
213 int update_tick;
214
215 #include "sysselect.h"
216
217 /* If we support a window system, turn on the code to poll periodically
218 to detect C-g. It isn't actually used when doing interrupt input. */
219 #ifdef HAVE_WINDOW_SYSTEM
220 #define POLL_FOR_INPUT
221 #endif
222
223 /* Mask of bits indicating the descriptors that we wait for input on. */
224
225 static SELECT_TYPE input_wait_mask;
226
227 /* Mask that excludes keyboard input descriptor (s). */
228
229 static SELECT_TYPE non_keyboard_wait_mask;
230
231 /* Mask that excludes process input descriptor (s). */
232
233 static SELECT_TYPE non_process_wait_mask;
234
235 /* The largest descriptor currently in use for a process object. */
236 static int max_process_desc;
237
238 /* The largest descriptor currently in use for keyboard input. */
239 static int max_keyboard_desc;
240
241 /* Nonzero means delete a process right away if it exits. */
242 static int delete_exited_processes;
243
244 /* Indexed by descriptor, gives the process (if any) for that descriptor */
245 Lisp_Object chan_process[MAXDESC];
246
247 /* Alist of elements (NAME . PROCESS) */
248 Lisp_Object Vprocess_alist;
249
250 /* Buffered-ahead input char from process, indexed by channel.
251 -1 means empty (no char is buffered).
252 Used on sys V where the only way to tell if there is any
253 output from the process is to read at least one char.
254 Always -1 on systems that support FIONREAD. */
255
256 /* Don't make static; need to access externally. */
257 int proc_buffered_char[MAXDESC];
258
259 /* Table of `struct coding-system' for each process. */
260 static struct coding_system *proc_decode_coding_system[MAXDESC];
261 static struct coding_system *proc_encode_coding_system[MAXDESC];
262
263 static Lisp_Object get_process ();
264
265 extern EMACS_TIME timer_check ();
266 extern int timers_run;
267
268 /* Maximum number of bytes to send to a pty without an eof. */
269 static int pty_max_bytes;
270
271 extern Lisp_Object Vfile_name_coding_system, Vdefault_file_name_coding_system;
272
273 #ifdef HAVE_PTYS
274 /* The file name of the pty opened by allocate_pty. */
275
276 static char pty_name[24];
277 #endif
278 \f
279 /* Compute the Lisp form of the process status, p->status, from
280 the numeric status that was returned by `wait'. */
281
282 Lisp_Object status_convert ();
283
284 void
285 update_status (p)
286 struct Lisp_Process *p;
287 {
288 union { int i; WAITTYPE wt; } u;
289 u.i = XFASTINT (p->raw_status_low) + (XFASTINT (p->raw_status_high) << 16);
290 p->status = status_convert (u.wt);
291 p->raw_status_low = Qnil;
292 p->raw_status_high = Qnil;
293 }
294
295 /* Convert a process status word in Unix format to
296 the list that we use internally. */
297
298 Lisp_Object
299 status_convert (w)
300 WAITTYPE w;
301 {
302 if (WIFSTOPPED (w))
303 return Fcons (Qstop, Fcons (make_number (WSTOPSIG (w)), Qnil));
304 else if (WIFEXITED (w))
305 return Fcons (Qexit, Fcons (make_number (WRETCODE (w)),
306 WCOREDUMP (w) ? Qt : Qnil));
307 else if (WIFSIGNALED (w))
308 return Fcons (Qsignal, Fcons (make_number (WTERMSIG (w)),
309 WCOREDUMP (w) ? Qt : Qnil));
310 else
311 return Qrun;
312 }
313
314 /* Given a status-list, extract the three pieces of information
315 and store them individually through the three pointers. */
316
317 void
318 decode_status (l, symbol, code, coredump)
319 Lisp_Object l;
320 Lisp_Object *symbol;
321 int *code;
322 int *coredump;
323 {
324 Lisp_Object tem;
325
326 if (SYMBOLP (l))
327 {
328 *symbol = l;
329 *code = 0;
330 *coredump = 0;
331 }
332 else
333 {
334 *symbol = XCONS (l)->car;
335 tem = XCONS (l)->cdr;
336 *code = XFASTINT (XCONS (tem)->car);
337 tem = XCONS (tem)->cdr;
338 *coredump = !NILP (tem);
339 }
340 }
341
342 /* Return a string describing a process status list. */
343
344 Lisp_Object
345 status_message (status)
346 Lisp_Object status;
347 {
348 Lisp_Object symbol;
349 int code, coredump;
350 Lisp_Object string, string2;
351
352 decode_status (status, &symbol, &code, &coredump);
353
354 if (EQ (symbol, Qsignal) || EQ (symbol, Qstop))
355 {
356 char *signame = 0;
357 if (code < NSIG)
358 {
359 #ifndef VMS
360 /* Cast to suppress warning if the table has const char *. */
361 signame = (char *) sys_siglist[code];
362 #else
363 signame = sys_errlist[code];
364 #endif
365 }
366 if (signame == 0)
367 signame = "unknown";
368 string = build_string (signame);
369 string2 = build_string (coredump ? " (core dumped)\n" : "\n");
370 XSTRING (string)->data[0] = DOWNCASE (XSTRING (string)->data[0]);
371 return concat2 (string, string2);
372 }
373 else if (EQ (symbol, Qexit))
374 {
375 if (code == 0)
376 return build_string ("finished\n");
377 string = Fnumber_to_string (make_number (code));
378 string2 = build_string (coredump ? " (core dumped)\n" : "\n");
379 return concat2 (build_string ("exited abnormally with code "),
380 concat2 (string, string2));
381 }
382 else
383 return Fcopy_sequence (Fsymbol_name (symbol));
384 }
385 \f
386 #ifdef HAVE_PTYS
387
388 /* Open an available pty, returning a file descriptor.
389 Return -1 on failure.
390 The file name of the terminal corresponding to the pty
391 is left in the variable pty_name. */
392
393 int
394 allocate_pty ()
395 {
396 struct stat stb;
397 register int c, i;
398 int fd;
399
400 /* Some systems name their pseudoterminals so that there are gaps in
401 the usual sequence - for example, on HP9000/S700 systems, there
402 are no pseudoterminals with names ending in 'f'. So we wait for
403 three failures in a row before deciding that we've reached the
404 end of the ptys. */
405 int failed_count = 0;
406
407 #ifdef PTY_ITERATION
408 PTY_ITERATION
409 #else
410 for (c = FIRST_PTY_LETTER; c <= 'z'; c++)
411 for (i = 0; i < 16; i++)
412 #endif
413 {
414 #ifdef PTY_NAME_SPRINTF
415 PTY_NAME_SPRINTF
416 #else
417 sprintf (pty_name, "/dev/pty%c%x", c, i);
418 #endif /* no PTY_NAME_SPRINTF */
419
420 #ifdef PTY_OPEN
421 PTY_OPEN;
422 #else /* no PTY_OPEN */
423 #ifdef IRIS
424 /* Unusual IRIS code */
425 *ptyv = open ("/dev/ptc", O_RDWR | O_NDELAY, 0);
426 if (fd < 0)
427 return -1;
428 if (fstat (fd, &stb) < 0)
429 return -1;
430 #else /* not IRIS */
431 if (stat (pty_name, &stb) < 0)
432 {
433 failed_count++;
434 if (failed_count >= 3)
435 return -1;
436 }
437 else
438 failed_count = 0;
439 #ifdef O_NONBLOCK
440 fd = open (pty_name, O_RDWR | O_NONBLOCK, 0);
441 #else
442 fd = open (pty_name, O_RDWR | O_NDELAY, 0);
443 #endif
444 #endif /* not IRIS */
445 #endif /* no PTY_OPEN */
446
447 if (fd >= 0)
448 {
449 /* check to make certain that both sides are available
450 this avoids a nasty yet stupid bug in rlogins */
451 #ifdef PTY_TTY_NAME_SPRINTF
452 PTY_TTY_NAME_SPRINTF
453 #else
454 sprintf (pty_name, "/dev/tty%c%x", c, i);
455 #endif /* no PTY_TTY_NAME_SPRINTF */
456 #ifndef UNIPLUS
457 if (access (pty_name, 6) != 0)
458 {
459 close (fd);
460 #if !defined(IRIS) && !defined(__sgi)
461 continue;
462 #else
463 return -1;
464 #endif /* IRIS */
465 }
466 #endif /* not UNIPLUS */
467 setup_pty (fd);
468 return fd;
469 }
470 }
471 return -1;
472 }
473 #endif /* HAVE_PTYS */
474 \f
475 Lisp_Object
476 make_process (name)
477 Lisp_Object name;
478 {
479 struct Lisp_Vector *vec;
480 register Lisp_Object val, tem, name1;
481 register struct Lisp_Process *p;
482 char suffix[10];
483 register int i;
484
485 vec = allocate_vectorlike ((EMACS_INT) VECSIZE (struct Lisp_Process));
486 for (i = 0; i < VECSIZE (struct Lisp_Process); i++)
487 vec->contents[i] = Qnil;
488 vec->size = VECSIZE (struct Lisp_Process);
489 p = (struct Lisp_Process *)vec;
490
491 XSETINT (p->infd, -1);
492 XSETINT (p->outfd, -1);
493 XSETFASTINT (p->pid, 0);
494 XSETFASTINT (p->tick, 0);
495 XSETFASTINT (p->update_tick, 0);
496 p->raw_status_low = Qnil;
497 p->raw_status_high = Qnil;
498 p->status = Qrun;
499 p->mark = Fmake_marker ();
500
501 /* If name is already in use, modify it until it is unused. */
502
503 name1 = name;
504 for (i = 1; ; i++)
505 {
506 tem = Fget_process (name1);
507 if (NILP (tem)) break;
508 sprintf (suffix, "<%d>", i);
509 name1 = concat2 (name, build_string (suffix));
510 }
511 name = name1;
512 p->name = name;
513 XSETPROCESS (val, p);
514 Vprocess_alist = Fcons (Fcons (name, val), Vprocess_alist);
515 return val;
516 }
517
518 void
519 remove_process (proc)
520 register Lisp_Object proc;
521 {
522 register Lisp_Object pair;
523
524 pair = Frassq (proc, Vprocess_alist);
525 Vprocess_alist = Fdelq (pair, Vprocess_alist);
526
527 deactivate_process (proc);
528 }
529 \f
530 DEFUN ("processp", Fprocessp, Sprocessp, 1, 1, 0,
531 "Return t if OBJECT is a process.")
532 (object)
533 Lisp_Object object;
534 {
535 return PROCESSP (object) ? Qt : Qnil;
536 }
537
538 DEFUN ("get-process", Fget_process, Sget_process, 1, 1, 0,
539 "Return the process named NAME, or nil if there is none.")
540 (name)
541 register Lisp_Object name;
542 {
543 if (PROCESSP (name))
544 return name;
545 CHECK_STRING (name, 0);
546 return Fcdr (Fassoc (name, Vprocess_alist));
547 }
548
549 DEFUN ("get-buffer-process", Fget_buffer_process, Sget_buffer_process, 1, 1, 0,
550 "Return the (or, a) process associated with BUFFER.\n\
551 BUFFER may be a buffer or the name of one.")
552 (buffer)
553 register Lisp_Object buffer;
554 {
555 register Lisp_Object buf, tail, proc;
556
557 if (NILP (buffer)) return Qnil;
558 buf = Fget_buffer (buffer);
559 if (NILP (buf)) return Qnil;
560
561 for (tail = Vprocess_alist; !NILP (tail); tail = Fcdr (tail))
562 {
563 proc = Fcdr (Fcar (tail));
564 if (PROCESSP (proc) && EQ (XPROCESS (proc)->buffer, buf))
565 return proc;
566 }
567 return Qnil;
568 }
569
570 /* This is how commands for the user decode process arguments. It
571 accepts a process, a process name, a buffer, a buffer name, or nil.
572 Buffers denote the first process in the buffer, and nil denotes the
573 current buffer. */
574
575 static Lisp_Object
576 get_process (name)
577 register Lisp_Object name;
578 {
579 register Lisp_Object proc, obj;
580 if (STRINGP (name))
581 {
582 obj = Fget_process (name);
583 if (NILP (obj))
584 obj = Fget_buffer (name);
585 if (NILP (obj))
586 error ("Process %s does not exist", XSTRING (name)->data);
587 }
588 else if (NILP (name))
589 obj = Fcurrent_buffer ();
590 else
591 obj = name;
592
593 /* Now obj should be either a buffer object or a process object.
594 */
595 if (BUFFERP (obj))
596 {
597 proc = Fget_buffer_process (obj);
598 if (NILP (proc))
599 error ("Buffer %s has no process", XSTRING (XBUFFER (obj)->name)->data);
600 }
601 else
602 {
603 CHECK_PROCESS (obj, 0);
604 proc = obj;
605 }
606 return proc;
607 }
608
609 DEFUN ("delete-process", Fdelete_process, Sdelete_process, 1, 1, 0,
610 "Delete PROCESS: kill it and forget about it immediately.\n\
611 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
612 nil, indicating the current buffer's process.")
613 (process)
614 register Lisp_Object process;
615 {
616 process = get_process (process);
617 XPROCESS (process)->raw_status_low = Qnil;
618 XPROCESS (process)->raw_status_high = Qnil;
619 if (NETCONN_P (process))
620 {
621 XPROCESS (process)->status = Fcons (Qexit, Fcons (make_number (0), Qnil));
622 XSETINT (XPROCESS (process)->tick, ++process_tick);
623 }
624 else if (XINT (XPROCESS (process)->infd) >= 0)
625 {
626 Fkill_process (process, Qnil);
627 /* Do this now, since remove_process will make sigchld_handler do nothing. */
628 XPROCESS (process)->status
629 = Fcons (Qsignal, Fcons (make_number (SIGKILL), Qnil));
630 XSETINT (XPROCESS (process)->tick, ++process_tick);
631 status_notify ();
632 }
633 remove_process (process);
634 return Qnil;
635 }
636 \f
637 DEFUN ("process-status", Fprocess_status, Sprocess_status, 1, 1, 0,
638 "Return the status of PROCESS: a symbol, one of these:\n\
639 run -- for a process that is running.\n\
640 stop -- for a process stopped but continuable.\n\
641 exit -- for a process that has exited.\n\
642 signal -- for a process that has got a fatal signal.\n\
643 open -- for a network stream connection that is open.\n\
644 closed -- for a network stream connection that is closed.\n\
645 nil -- if arg is a process name and no such process exists.\n\
646 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
647 nil, indicating the current buffer's process.")
648 (process)
649 register Lisp_Object process;
650 {
651 register struct Lisp_Process *p;
652 register Lisp_Object status;
653
654 if (STRINGP (process))
655 process = Fget_process (process);
656 else
657 process = get_process (process);
658
659 if (NILP (process))
660 return process;
661
662 p = XPROCESS (process);
663 if (!NILP (p->raw_status_low))
664 update_status (p);
665 status = p->status;
666 if (CONSP (status))
667 status = XCONS (status)->car;
668 if (NETCONN_P (process))
669 {
670 if (EQ (status, Qrun))
671 status = Qopen;
672 else if (EQ (status, Qexit))
673 status = Qclosed;
674 }
675 return status;
676 }
677
678 DEFUN ("process-exit-status", Fprocess_exit_status, Sprocess_exit_status,
679 1, 1, 0,
680 "Return the exit status of PROCESS or the signal number that killed it.\n\
681 If PROCESS has not yet exited or died, return 0.")
682 (process)
683 register Lisp_Object process;
684 {
685 CHECK_PROCESS (process, 0);
686 if (!NILP (XPROCESS (process)->raw_status_low))
687 update_status (XPROCESS (process));
688 if (CONSP (XPROCESS (process)->status))
689 return XCONS (XCONS (XPROCESS (process)->status)->cdr)->car;
690 return make_number (0);
691 }
692
693 DEFUN ("process-id", Fprocess_id, Sprocess_id, 1, 1, 0,
694 "Return the process id of PROCESS.\n\
695 This is the pid of the Unix process which PROCESS uses or talks to.\n\
696 For a network connection, this value is nil.")
697 (process)
698 register Lisp_Object process;
699 {
700 CHECK_PROCESS (process, 0);
701 return XPROCESS (process)->pid;
702 }
703
704 DEFUN ("process-name", Fprocess_name, Sprocess_name, 1, 1, 0,
705 "Return the name of PROCESS, as a string.\n\
706 This is the name of the program invoked in PROCESS,\n\
707 possibly modified to make it unique among process names.")
708 (process)
709 register Lisp_Object process;
710 {
711 CHECK_PROCESS (process, 0);
712 return XPROCESS (process)->name;
713 }
714
715 DEFUN ("process-command", Fprocess_command, Sprocess_command, 1, 1, 0,
716 "Return the command that was executed to start PROCESS.\n\
717 This is a list of strings, the first string being the program executed\n\
718 and the rest of the strings being the arguments given to it.\n\
719 For a non-child channel, this is nil.")
720 (process)
721 register Lisp_Object process;
722 {
723 CHECK_PROCESS (process, 0);
724 return XPROCESS (process)->command;
725 }
726
727 DEFUN ("process-tty-name", Fprocess_tty_name, Sprocess_tty_name, 1, 1, 0,
728 "Return the name of the terminal PROCESS uses, or nil if none.\n\
729 This is the terminal that the process itself reads and writes on,\n\
730 not the name of the pty that Emacs uses to talk with that terminal.")
731 (process)
732 register Lisp_Object process;
733 {
734 CHECK_PROCESS (process, 0);
735 return XPROCESS (process)->tty_name;
736 }
737
738 DEFUN ("set-process-buffer", Fset_process_buffer, Sset_process_buffer,
739 2, 2, 0,
740 "Set buffer associated with PROCESS to BUFFER (a buffer, or nil).")
741 (process, buffer)
742 register Lisp_Object process, buffer;
743 {
744 CHECK_PROCESS (process, 0);
745 if (!NILP (buffer))
746 CHECK_BUFFER (buffer, 1);
747 XPROCESS (process)->buffer = buffer;
748 return buffer;
749 }
750
751 DEFUN ("process-buffer", Fprocess_buffer, Sprocess_buffer,
752 1, 1, 0,
753 "Return the buffer PROCESS is associated with.\n\
754 Output from PROCESS is inserted in this buffer\n\
755 unless PROCESS has a filter.")
756 (process)
757 register Lisp_Object process;
758 {
759 CHECK_PROCESS (process, 0);
760 return XPROCESS (process)->buffer;
761 }
762
763 DEFUN ("process-mark", Fprocess_mark, Sprocess_mark,
764 1, 1, 0,
765 "Return the marker for the end of the last output from PROCESS.")
766 (process)
767 register Lisp_Object process;
768 {
769 CHECK_PROCESS (process, 0);
770 return XPROCESS (process)->mark;
771 }
772
773 DEFUN ("set-process-filter", Fset_process_filter, Sset_process_filter,
774 2, 2, 0,
775 "Give PROCESS the filter function FILTER; nil means no filter.\n\
776 t means stop accepting output from the process.\n\
777 When a process has a filter, each time it does output\n\
778 the entire string of output is passed to the filter.\n\
779 The filter gets two arguments: the process and the string of output.\n\
780 If the process has a filter, its buffer is not used for output.")
781 (process, filter)
782 register Lisp_Object process, filter;
783 {
784 CHECK_PROCESS (process, 0);
785 if (EQ (filter, Qt))
786 {
787 FD_CLR (XINT (XPROCESS (process)->infd), &input_wait_mask);
788 FD_CLR (XINT (XPROCESS (process)->infd), &non_keyboard_wait_mask);
789 }
790 else if (EQ (XPROCESS (process)->filter, Qt))
791 {
792 FD_SET (XINT (XPROCESS (process)->infd), &input_wait_mask);
793 FD_SET (XINT (XPROCESS (process)->infd), &non_keyboard_wait_mask);
794 }
795 XPROCESS (process)->filter = filter;
796 return filter;
797 }
798
799 DEFUN ("process-filter", Fprocess_filter, Sprocess_filter,
800 1, 1, 0,
801 "Returns the filter function of PROCESS; nil if none.\n\
802 See `set-process-filter' for more info on filter functions.")
803 (process)
804 register Lisp_Object process;
805 {
806 CHECK_PROCESS (process, 0);
807 return XPROCESS (process)->filter;
808 }
809
810 DEFUN ("set-process-sentinel", Fset_process_sentinel, Sset_process_sentinel,
811 2, 2, 0,
812 "Give PROCESS the sentinel SENTINEL; nil for none.\n\
813 The sentinel is called as a function when the process changes state.\n\
814 It gets two arguments: the process, and a string describing the change.")
815 (process, sentinel)
816 register Lisp_Object process, sentinel;
817 {
818 CHECK_PROCESS (process, 0);
819 XPROCESS (process)->sentinel = sentinel;
820 return sentinel;
821 }
822
823 DEFUN ("process-sentinel", Fprocess_sentinel, Sprocess_sentinel,
824 1, 1, 0,
825 "Return the sentinel of PROCESS; nil if none.\n\
826 See `set-process-sentinel' for more info on sentinels.")
827 (process)
828 register Lisp_Object process;
829 {
830 CHECK_PROCESS (process, 0);
831 return XPROCESS (process)->sentinel;
832 }
833
834 DEFUN ("set-process-window-size", Fset_process_window_size,
835 Sset_process_window_size, 3, 3, 0,
836 "Tell PROCESS that it has logical window size HEIGHT and WIDTH.")
837 (process, height, width)
838 register Lisp_Object process, height, width;
839 {
840 CHECK_PROCESS (process, 0);
841 CHECK_NATNUM (height, 0);
842 CHECK_NATNUM (width, 0);
843 if (set_window_size (XINT (XPROCESS (process)->infd),
844 XINT (height), XINT(width)) <= 0)
845 return Qnil;
846 else
847 return Qt;
848 }
849
850 DEFUN ("set-process-inherit-coding-system-flag",
851 Fset_process_inherit_coding_system_flag,
852 Sset_process_inherit_coding_system_flag, 2, 2, 0,
853 "Determine whether buffer of PROCESS will inherit coding-system.\n\
854 If the second argument FLAG is non-nil, then the variable\n\
855 `buffer-file-coding-system' of the buffer associated with PROCESS\n\
856 will be bound to the value of the coding system used to decode\n\
857 the process output.\n\
858 \n\
859 This is useful when the coding system specified for the process buffer\n\
860 leaves either the character code conversion or the end-of-line conversion\n\
861 unspecified, or if the coding system used to decode the process output\n\
862 is more appropriate for saving the process buffer.\n\
863 \n\
864 Binding the variable `inherit-process-coding-system' to non-nil before\n\
865 starting the process is an alternative way of setting the inherit flag\n\
866 for the process which will run.")
867 (process, flag)
868 register Lisp_Object process, flag;
869 {
870 CHECK_PROCESS (process, 0);
871 XPROCESS (process)->inherit_coding_system_flag = flag;
872 return flag;
873 }
874
875 DEFUN ("process-inherit-coding-system-flag",
876 Fprocess_inherit_coding_system_flag, Sprocess_inherit_coding_system_flag,
877 1, 1, 0,
878 "Return the value of inherit-coding-system flag for PROCESS.\n\
879 If this flag is t, `buffer-file-coding-system' of the buffer\n\
880 associated with PROCESS will inherit the coding system used to decode\n\
881 the process output.")
882 (process)
883 register Lisp_Object process;
884 {
885 CHECK_PROCESS (process, 0);
886 return XPROCESS (process)->inherit_coding_system_flag;
887 }
888
889 DEFUN ("process-kill-without-query", Fprocess_kill_without_query,
890 Sprocess_kill_without_query, 1, 2, 0,
891 "Say no query needed if PROCESS is running when Emacs is exited.\n\
892 Optional second argument if non-nil says to require a query.\n\
893 Value is t if a query was formerly required.")
894 (process, value)
895 register Lisp_Object process, value;
896 {
897 Lisp_Object tem;
898
899 CHECK_PROCESS (process, 0);
900 tem = XPROCESS (process)->kill_without_query;
901 XPROCESS (process)->kill_without_query = Fnull (value);
902
903 return Fnull (tem);
904 }
905
906 DEFUN ("process-contact", Fprocess_contact, Sprocess_contact,
907 1, 1, 0,
908 "Return the contact info of PROCESS; t for a real child.\n\
909 For a net connection, the value is a cons cell of the form (HOST SERVICE).")
910 (process)
911 register Lisp_Object process;
912 {
913 CHECK_PROCESS (process, 0);
914 return XPROCESS (process)->childp;
915 }
916
917 #if 0 /* Turned off because we don't currently record this info
918 in the process. Perhaps add it. */
919 DEFUN ("process-connection", Fprocess_connection, Sprocess_connection, 1, 1, 0,
920 "Return the connection type of `PROCESS'.\n\
921 The value is `nil' for a pipe,\n\
922 `t' or `pty' for a pty, or `stream' for a socket connection.")
923 (process)
924 Lisp_Object process;
925 {
926 return XPROCESS (process)->type;
927 }
928 #endif
929 \f
930 Lisp_Object
931 list_processes_1 ()
932 {
933 register Lisp_Object tail, tem;
934 Lisp_Object proc, minspace, tem1;
935 register struct buffer *old = current_buffer;
936 register struct Lisp_Process *p;
937 register int state;
938 char tembuf[80];
939
940 XSETFASTINT (minspace, 1);
941
942 set_buffer_internal (XBUFFER (Vstandard_output));
943 Fbuffer_disable_undo (Vstandard_output);
944
945 current_buffer->truncate_lines = Qt;
946
947 write_string ("\
948 Proc Status Buffer Tty Command\n\
949 ---- ------ ------ --- -------\n", -1);
950
951 for (tail = Vprocess_alist; !NILP (tail); tail = Fcdr (tail))
952 {
953 Lisp_Object symbol;
954
955 proc = Fcdr (Fcar (tail));
956 p = XPROCESS (proc);
957 if (NILP (p->childp))
958 continue;
959
960 Finsert (1, &p->name);
961 Findent_to (make_number (13), minspace);
962
963 if (!NILP (p->raw_status_low))
964 update_status (p);
965 symbol = p->status;
966 if (CONSP (p->status))
967 symbol = XCONS (p->status)->car;
968
969
970 if (EQ (symbol, Qsignal))
971 {
972 Lisp_Object tem;
973 tem = Fcar (Fcdr (p->status));
974 #ifdef VMS
975 if (XINT (tem) < NSIG)
976 write_string (sys_errlist [XINT (tem)], -1);
977 else
978 #endif
979 Fprinc (symbol, Qnil);
980 }
981 else if (NETCONN_P (proc))
982 {
983 if (EQ (symbol, Qrun))
984 write_string ("open", -1);
985 else if (EQ (symbol, Qexit))
986 write_string ("closed", -1);
987 else
988 Fprinc (symbol, Qnil);
989 }
990 else
991 Fprinc (symbol, Qnil);
992
993 if (EQ (symbol, Qexit))
994 {
995 Lisp_Object tem;
996 tem = Fcar (Fcdr (p->status));
997 if (XFASTINT (tem))
998 {
999 sprintf (tembuf, " %d", (int) XFASTINT (tem));
1000 write_string (tembuf, -1);
1001 }
1002 }
1003
1004 if (EQ (symbol, Qsignal) || EQ (symbol, Qexit))
1005 remove_process (proc);
1006
1007 Findent_to (make_number (22), minspace);
1008 if (NILP (p->buffer))
1009 insert_string ("(none)");
1010 else if (NILP (XBUFFER (p->buffer)->name))
1011 insert_string ("(Killed)");
1012 else
1013 Finsert (1, &XBUFFER (p->buffer)->name);
1014
1015 Findent_to (make_number (37), minspace);
1016
1017 if (STRINGP (p->tty_name))
1018 Finsert (1, &p->tty_name);
1019 else
1020 insert_string ("(none)");
1021
1022 Findent_to (make_number (49), minspace);
1023
1024 if (NETCONN_P (proc))
1025 {
1026 sprintf (tembuf, "(network stream connection to %s)\n",
1027 XSTRING (XCONS (p->childp)->car)->data);
1028 insert_string (tembuf);
1029 }
1030 else
1031 {
1032 tem = p->command;
1033 while (1)
1034 {
1035 tem1 = Fcar (tem);
1036 Finsert (1, &tem1);
1037 tem = Fcdr (tem);
1038 if (NILP (tem))
1039 break;
1040 insert_string (" ");
1041 }
1042 insert_string ("\n");
1043 }
1044 }
1045 return Qnil;
1046 }
1047
1048 DEFUN ("list-processes", Flist_processes, Slist_processes, 0, 0, "",
1049 "Display a list of all processes.\n\
1050 \(Any processes listed as Exited or Signaled are actually eliminated\n\
1051 after the listing is made.)")
1052 ()
1053 {
1054 internal_with_output_to_temp_buffer ("*Process List*",
1055 list_processes_1, Qnil);
1056 return Qnil;
1057 }
1058
1059 DEFUN ("process-list", Fprocess_list, Sprocess_list, 0, 0, 0,
1060 "Return a list of all processes.")
1061 ()
1062 {
1063 return Fmapcar (Qcdr, Vprocess_alist);
1064 }
1065 \f
1066 /* Starting asynchronous inferior processes. */
1067
1068 static Lisp_Object start_process_unwind ();
1069
1070 DEFUN ("start-process", Fstart_process, Sstart_process, 3, MANY, 0,
1071 "Start a program in a subprocess. Return the process object for it.\n\
1072 Args are NAME BUFFER PROGRAM &rest PROGRAM-ARGS\n\
1073 NAME is name for process. It is modified if necessary to make it unique.\n\
1074 BUFFER is the buffer or (buffer-name) to associate with the process.\n\
1075 Process output goes at end of that buffer, unless you specify\n\
1076 an output stream or filter function to handle the output.\n\
1077 BUFFER may be also nil, meaning that this process is not associated\n\
1078 with any buffer.\n\
1079 Third arg is program file name. It is searched for in PATH.\n\
1080 Remaining arguments are strings to give program as arguments.")
1081 (nargs, args)
1082 int nargs;
1083 register Lisp_Object *args;
1084 {
1085 Lisp_Object buffer, name, program, proc, current_dir, tem;
1086 #ifdef VMS
1087 register unsigned char *new_argv;
1088 int len;
1089 #else
1090 register unsigned char **new_argv;
1091 #endif
1092 register int i;
1093 int count = specpdl_ptr - specpdl;
1094
1095 buffer = args[1];
1096 if (!NILP (buffer))
1097 buffer = Fget_buffer_create (buffer);
1098
1099 /* Make sure that the child will be able to chdir to the current
1100 buffer's current directory, or its unhandled equivalent. We
1101 can't just have the child check for an error when it does the
1102 chdir, since it's in a vfork.
1103
1104 We have to GCPRO around this because Fexpand_file_name and
1105 Funhandled_file_name_directory might call a file name handling
1106 function. The argument list is protected by the caller, so all
1107 we really have to worry about is buffer. */
1108 {
1109 struct gcpro gcpro1, gcpro2;
1110
1111 current_dir = current_buffer->directory;
1112
1113 GCPRO2 (buffer, current_dir);
1114
1115 current_dir
1116 = expand_and_dir_to_file (Funhandled_file_name_directory (current_dir),
1117 Qnil);
1118 if (NILP (Ffile_accessible_directory_p (current_dir)))
1119 report_file_error ("Setting current directory",
1120 Fcons (current_buffer->directory, Qnil));
1121
1122 UNGCPRO;
1123 }
1124
1125 name = args[0];
1126 CHECK_STRING (name, 0);
1127
1128 program = args[2];
1129
1130 CHECK_STRING (program, 2);
1131
1132 #ifdef VMS
1133 /* Make a one member argv with all args concatenated
1134 together separated by a blank. */
1135 len = STRING_BYTES (XSTRING (program)) + 2;
1136 for (i = 3; i < nargs; i++)
1137 {
1138 tem = args[i];
1139 CHECK_STRING (tem, i);
1140 len += STRING_BYTES (XSTRING (tem)) + 1; /* count the blank */
1141 }
1142 new_argv = (unsigned char *) alloca (len);
1143 strcpy (new_argv, XSTRING (program)->data);
1144 for (i = 3; i < nargs; i++)
1145 {
1146 tem = args[i];
1147 CHECK_STRING (tem, i);
1148 strcat (new_argv, " ");
1149 strcat (new_argv, XSTRING (tem)->data);
1150 }
1151 /* Need to add code here to check for program existence on VMS */
1152
1153 #else /* not VMS */
1154 new_argv = (unsigned char **) alloca ((nargs - 1) * sizeof (char *));
1155
1156 /* If program file name is not absolute, search our path for it */
1157 if (!IS_DIRECTORY_SEP (XSTRING (program)->data[0])
1158 && !(XSTRING (program)->size > 1
1159 && IS_DEVICE_SEP (XSTRING (program)->data[1])))
1160 {
1161 struct gcpro gcpro1, gcpro2, gcpro3, gcpro4;
1162
1163 tem = Qnil;
1164 GCPRO4 (name, program, buffer, current_dir);
1165 openp (Vexec_path, program, EXEC_SUFFIXES, &tem, 1);
1166 UNGCPRO;
1167 if (NILP (tem))
1168 report_file_error ("Searching for program", Fcons (program, Qnil));
1169 tem = Fexpand_file_name (tem, Qnil);
1170 new_argv[0] = XSTRING (tem)->data;
1171 }
1172 else
1173 {
1174 if (!NILP (Ffile_directory_p (program)))
1175 error ("Specified program for new process is a directory");
1176
1177 new_argv[0] = XSTRING (program)->data;
1178 }
1179
1180 for (i = 3; i < nargs; i++)
1181 {
1182 tem = args[i];
1183 CHECK_STRING (tem, i);
1184 new_argv[i - 2] = XSTRING (tem)->data;
1185 }
1186 new_argv[i - 2] = 0;
1187 #endif /* not VMS */
1188
1189 proc = make_process (name);
1190 /* If an error occurs and we can't start the process, we want to
1191 remove it from the process list. This means that each error
1192 check in create_process doesn't need to call remove_process
1193 itself; it's all taken care of here. */
1194 record_unwind_protect (start_process_unwind, proc);
1195
1196 XPROCESS (proc)->childp = Qt;
1197 XPROCESS (proc)->command_channel_p = Qnil;
1198 XPROCESS (proc)->buffer = buffer;
1199 XPROCESS (proc)->sentinel = Qnil;
1200 XPROCESS (proc)->filter = Qnil;
1201 XPROCESS (proc)->command = Flist (nargs - 2, args + 2);
1202
1203 /* Make the process marker point into the process buffer (if any). */
1204 if (!NILP (buffer))
1205 set_marker_both (XPROCESS (proc)->mark, buffer,
1206 BUF_ZV (XBUFFER (buffer)),
1207 BUF_ZV_BYTE (XBUFFER (buffer)));
1208
1209 {
1210 /* Decide coding systems for communicating with the process. Here
1211 we don't setup the structure coding_system nor pay attention to
1212 unibyte mode. They are done in create_process. */
1213
1214 /* Qt denotes we have not yet called Ffind_operation_coding_system. */
1215 Lisp_Object coding_systems = Qt;
1216 Lisp_Object val, *args2;
1217 struct gcpro gcpro1;
1218
1219 val = Vcoding_system_for_read;
1220 if (NILP (val))
1221 {
1222 args2 = (Lisp_Object *) alloca ((nargs + 1) * sizeof *args2);
1223 args2[0] = Qstart_process;
1224 for (i = 0; i < nargs; i++) args2[i + 1] = args[i];
1225 GCPRO1 (proc);
1226 coding_systems = Ffind_operation_coding_system (nargs + 1, args2);
1227 UNGCPRO;
1228 if (CONSP (coding_systems))
1229 val = XCONS (coding_systems)->car;
1230 else if (CONSP (Vdefault_process_coding_system))
1231 val = XCONS (Vdefault_process_coding_system)->car;
1232 }
1233 XPROCESS (proc)->decode_coding_system = val;
1234
1235 val = Vcoding_system_for_write;
1236 if (NILP (val))
1237 {
1238 if (EQ (coding_systems, Qt))
1239 {
1240 args2 = (Lisp_Object *) alloca ((nargs + 1) * sizeof args2);
1241 args2[0] = Qstart_process;
1242 for (i = 0; i < nargs; i++) args2[i + 1] = args[i];
1243 GCPRO1 (proc);
1244 coding_systems = Ffind_operation_coding_system (nargs + 1, args2);
1245 UNGCPRO;
1246 }
1247 if (CONSP (coding_systems))
1248 val = XCONS (coding_systems)->cdr;
1249 else if (CONSP (Vdefault_process_coding_system))
1250 val = XCONS (Vdefault_process_coding_system)->cdr;
1251 }
1252 XPROCESS (proc)->encode_coding_system = val;
1253 }
1254
1255 XPROCESS (proc)->decoding_buf = make_uninit_string (0);
1256 XPROCESS (proc)->decoding_carryover = make_number (0);
1257 XPROCESS (proc)->encoding_buf = make_uninit_string (0);
1258 XPROCESS (proc)->encoding_carryover = make_number (0);
1259
1260 XPROCESS (proc)->inherit_coding_system_flag
1261 = (NILP (buffer) || !inherit_process_coding_system
1262 ? Qnil : Qt);
1263
1264 create_process (proc, (char **) new_argv, current_dir);
1265
1266 return unbind_to (count, proc);
1267 }
1268
1269 /* This function is the unwind_protect form for Fstart_process. If
1270 PROC doesn't have its pid set, then we know someone has signaled
1271 an error and the process wasn't started successfully, so we should
1272 remove it from the process list. */
1273 static Lisp_Object
1274 start_process_unwind (proc)
1275 Lisp_Object proc;
1276 {
1277 if (!PROCESSP (proc))
1278 abort ();
1279
1280 /* Was PROC started successfully? */
1281 if (XINT (XPROCESS (proc)->pid) <= 0)
1282 remove_process (proc);
1283
1284 return Qnil;
1285 }
1286
1287
1288 SIGTYPE
1289 create_process_1 (signo)
1290 int signo;
1291 {
1292 #if defined (USG) && !defined (POSIX_SIGNALS)
1293 /* USG systems forget handlers when they are used;
1294 must reestablish each time */
1295 signal (signo, create_process_1);
1296 #endif /* USG */
1297 }
1298
1299 #if 0 /* This doesn't work; see the note before sigchld_handler. */
1300 #ifdef USG
1301 #ifdef SIGCHLD
1302 /* Mimic blocking of signals on system V, which doesn't really have it. */
1303
1304 /* Nonzero means we got a SIGCHLD when it was supposed to be blocked. */
1305 int sigchld_deferred;
1306
1307 SIGTYPE
1308 create_process_sigchld ()
1309 {
1310 signal (SIGCHLD, create_process_sigchld);
1311
1312 sigchld_deferred = 1;
1313 }
1314 #endif
1315 #endif
1316 #endif
1317
1318 #ifndef VMS /* VMS version of this function is in vmsproc.c. */
1319 void
1320 create_process (process, new_argv, current_dir)
1321 Lisp_Object process;
1322 char **new_argv;
1323 Lisp_Object current_dir;
1324 {
1325 int pid, inchannel, outchannel;
1326 int sv[2];
1327 #ifdef POSIX_SIGNALS
1328 sigset_t procmask;
1329 sigset_t blocked;
1330 struct sigaction sigint_action;
1331 struct sigaction sigquit_action;
1332 #ifdef AIX
1333 struct sigaction sighup_action;
1334 #endif
1335 #else /* !POSIX_SIGNALS */
1336 #ifdef SIGCHLD
1337 SIGTYPE (*sigchld)();
1338 #endif
1339 #endif /* !POSIX_SIGNALS */
1340 /* Use volatile to protect variables from being clobbered by longjmp. */
1341 volatile int forkin, forkout;
1342 volatile int pty_flag = 0;
1343 extern char **environ;
1344 Lisp_Object buffer = XPROCESS (process)->buffer;
1345
1346 inchannel = outchannel = -1;
1347
1348 #ifdef HAVE_PTYS
1349 if (!NILP (Vprocess_connection_type))
1350 outchannel = inchannel = allocate_pty ();
1351
1352 if (inchannel >= 0)
1353 {
1354 #ifndef USG
1355 /* On USG systems it does not work to open the pty's tty here
1356 and then close and reopen it in the child. */
1357 #ifdef O_NOCTTY
1358 /* Don't let this terminal become our controlling terminal
1359 (in case we don't have one). */
1360 forkout = forkin = open (pty_name, O_RDWR | O_NOCTTY, 0);
1361 #else
1362 forkout = forkin = open (pty_name, O_RDWR, 0);
1363 #endif
1364 if (forkin < 0)
1365 report_file_error ("Opening pty", Qnil);
1366 #else
1367 forkin = forkout = -1;
1368 #endif /* not USG */
1369 pty_flag = 1;
1370 }
1371 else
1372 #endif /* HAVE_PTYS */
1373 #ifdef SKTPAIR
1374 {
1375 if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv) < 0)
1376 report_file_error ("Opening socketpair", Qnil);
1377 outchannel = inchannel = sv[0];
1378 forkout = forkin = sv[1];
1379 }
1380 #else /* not SKTPAIR */
1381 {
1382 pipe (sv);
1383 inchannel = sv[0];
1384 forkout = sv[1];
1385 pipe (sv);
1386 outchannel = sv[1];
1387 forkin = sv[0];
1388 }
1389 #endif /* not SKTPAIR */
1390
1391 #if 0
1392 /* Replaced by close_process_descs */
1393 set_exclusive_use (inchannel);
1394 set_exclusive_use (outchannel);
1395 #endif
1396
1397 /* Stride people say it's a mystery why this is needed
1398 as well as the O_NDELAY, but that it fails without this. */
1399 #if defined (STRIDE) || (defined (pfa) && defined (HAVE_PTYS))
1400 {
1401 int one = 1;
1402 ioctl (inchannel, FIONBIO, &one);
1403 }
1404 #endif
1405
1406 #ifdef O_NONBLOCK
1407 fcntl (inchannel, F_SETFL, O_NONBLOCK);
1408 fcntl (outchannel, F_SETFL, O_NONBLOCK);
1409 #else
1410 #ifdef O_NDELAY
1411 fcntl (inchannel, F_SETFL, O_NDELAY);
1412 fcntl (outchannel, F_SETFL, O_NDELAY);
1413 #endif
1414 #endif
1415
1416 /* Record this as an active process, with its channels.
1417 As a result, child_setup will close Emacs's side of the pipes. */
1418 chan_process[inchannel] = process;
1419 XSETINT (XPROCESS (process)->infd, inchannel);
1420 XSETINT (XPROCESS (process)->outfd, outchannel);
1421 /* Record the tty descriptor used in the subprocess. */
1422 if (forkin < 0)
1423 XPROCESS (process)->subtty = Qnil;
1424 else
1425 XSETFASTINT (XPROCESS (process)->subtty, forkin);
1426 XPROCESS (process)->pty_flag = (pty_flag ? Qt : Qnil);
1427 XPROCESS (process)->status = Qrun;
1428 if (!proc_decode_coding_system[inchannel])
1429 proc_decode_coding_system[inchannel]
1430 = (struct coding_system *) xmalloc (sizeof (struct coding_system));
1431 setup_coding_system (XPROCESS (process)->decode_coding_system,
1432 proc_decode_coding_system[inchannel]);
1433 if (!proc_encode_coding_system[outchannel])
1434 proc_encode_coding_system[outchannel]
1435 = (struct coding_system *) xmalloc (sizeof (struct coding_system));
1436 setup_coding_system (XPROCESS (process)->encode_coding_system,
1437 proc_encode_coding_system[outchannel]);
1438
1439 if (!NILP (buffer) && NILP (XBUFFER (buffer)->enable_multibyte_characters)
1440 || (NILP (buffer) && NILP (buffer_defaults.enable_multibyte_characters)))
1441 {
1442 /* In unibyte mode, character code conversion should not take
1443 place but EOL conversion should. So, setup raw-text or one
1444 of the subsidiary according to the information just setup. */
1445 if (NILP (Vcoding_system_for_read)
1446 && !NILP (XPROCESS (process)->decode_coding_system))
1447 setup_raw_text_coding_system (proc_decode_coding_system[inchannel]);
1448 if (NILP (Vcoding_system_for_write)
1449 && !NILP (XPROCESS (process)->encode_coding_system))
1450 setup_raw_text_coding_system (proc_decode_coding_system[outchannel]);
1451 }
1452
1453 if (CODING_REQUIRE_ENCODING (proc_encode_coding_system[outchannel]))
1454 {
1455 /* Here we encode arguments by the coding system used for
1456 sending data to the process. We don't support using
1457 different coding systems for encoding arguments and for
1458 encoding data sent to the process. */
1459 struct gcpro gcpro1;
1460 int i = 1;
1461 struct coding_system *coding = proc_encode_coding_system[outchannel];
1462
1463 coding->mode |= CODING_MODE_LAST_BLOCK;
1464 GCPRO1 (process);
1465 while (new_argv[i] != 0)
1466 {
1467 int len = strlen (new_argv[i]);
1468 int size = encoding_buffer_size (coding, len);
1469 unsigned char *buf = (unsigned char *) alloca (size);
1470
1471 encode_coding (coding, (unsigned char *)new_argv[i], buf, len, size);
1472 buf[coding->produced] = 0;
1473 /* We don't have to free new_argv[i] because it points to a
1474 Lisp string given as an argument to `start-process'. */
1475 new_argv[i++] = (char *) buf;
1476 }
1477 UNGCPRO;
1478 coding->mode &= ~CODING_MODE_LAST_BLOCK;
1479 }
1480
1481 /* Delay interrupts until we have a chance to store
1482 the new fork's pid in its process structure */
1483 #ifdef POSIX_SIGNALS
1484 sigemptyset (&blocked);
1485 #ifdef SIGCHLD
1486 sigaddset (&blocked, SIGCHLD);
1487 #endif
1488 #ifdef HAVE_VFORK
1489 /* On many hosts (e.g. Solaris 2.4), if a vforked child calls `signal',
1490 this sets the parent's signal handlers as well as the child's.
1491 So delay all interrupts whose handlers the child might munge,
1492 and record the current handlers so they can be restored later. */
1493 sigaddset (&blocked, SIGINT ); sigaction (SIGINT , 0, &sigint_action );
1494 sigaddset (&blocked, SIGQUIT); sigaction (SIGQUIT, 0, &sigquit_action);
1495 #ifdef AIX
1496 sigaddset (&blocked, SIGHUP ); sigaction (SIGHUP , 0, &sighup_action );
1497 #endif
1498 #endif /* HAVE_VFORK */
1499 sigprocmask (SIG_BLOCK, &blocked, &procmask);
1500 #else /* !POSIX_SIGNALS */
1501 #ifdef SIGCHLD
1502 #ifdef BSD4_1
1503 sighold (SIGCHLD);
1504 #else /* not BSD4_1 */
1505 #if defined (BSD_SYSTEM) || defined (UNIPLUS) || defined (HPUX)
1506 sigsetmask (sigmask (SIGCHLD));
1507 #else /* ordinary USG */
1508 #if 0
1509 sigchld_deferred = 0;
1510 sigchld = signal (SIGCHLD, create_process_sigchld);
1511 #endif
1512 #endif /* ordinary USG */
1513 #endif /* not BSD4_1 */
1514 #endif /* SIGCHLD */
1515 #endif /* !POSIX_SIGNALS */
1516
1517 FD_SET (inchannel, &input_wait_mask);
1518 FD_SET (inchannel, &non_keyboard_wait_mask);
1519 if (inchannel > max_process_desc)
1520 max_process_desc = inchannel;
1521
1522 /* Until we store the proper pid, enable sigchld_handler
1523 to recognize an unknown pid as standing for this process.
1524 It is very important not to let this `marker' value stay
1525 in the table after this function has returned; if it does
1526 it might cause call-process to hang and subsequent asynchronous
1527 processes to get their return values scrambled. */
1528 XSETINT (XPROCESS (process)->pid, -1);
1529
1530 BLOCK_INPUT;
1531
1532 {
1533 /* child_setup must clobber environ on systems with true vfork.
1534 Protect it from permanent change. */
1535 char **save_environ = environ;
1536
1537 current_dir = ENCODE_FILE (current_dir);
1538
1539 #ifndef WINDOWSNT
1540 pid = vfork ();
1541 if (pid == 0)
1542 #endif /* not WINDOWSNT */
1543 {
1544 int xforkin = forkin;
1545 int xforkout = forkout;
1546
1547 #if 0 /* This was probably a mistake--it duplicates code later on,
1548 but fails to handle all the cases. */
1549 /* Make sure SIGCHLD is not blocked in the child. */
1550 sigsetmask (SIGEMPTYMASK);
1551 #endif
1552
1553 /* Make the pty be the controlling terminal of the process. */
1554 #ifdef HAVE_PTYS
1555 /* First, disconnect its current controlling terminal. */
1556 #ifdef HAVE_SETSID
1557 /* We tried doing setsid only if pty_flag, but it caused
1558 process_set_signal to fail on SGI when using a pipe. */
1559 setsid ();
1560 /* Make the pty's terminal the controlling terminal. */
1561 if (pty_flag)
1562 {
1563 #ifdef TIOCSCTTY
1564 /* We ignore the return value
1565 because faith@cs.unc.edu says that is necessary on Linux. */
1566 ioctl (xforkin, TIOCSCTTY, 0);
1567 #endif
1568 }
1569 #else /* not HAVE_SETSID */
1570 #ifdef USG
1571 /* It's very important to call setpgrp here and no time
1572 afterwards. Otherwise, we lose our controlling tty which
1573 is set when we open the pty. */
1574 setpgrp ();
1575 #endif /* USG */
1576 #endif /* not HAVE_SETSID */
1577 #if defined (HAVE_TERMIOS) && defined (LDISC1)
1578 if (pty_flag && xforkin >= 0)
1579 {
1580 struct termios t;
1581 tcgetattr (xforkin, &t);
1582 t.c_lflag = LDISC1;
1583 if (tcsetattr (xforkin, TCSANOW, &t) < 0)
1584 write (1, "create_process/tcsetattr LDISC1 failed\n", 39);
1585 }
1586 #else
1587 #if defined (NTTYDISC) && defined (TIOCSETD)
1588 if (pty_flag && xforkin >= 0)
1589 {
1590 /* Use new line discipline. */
1591 int ldisc = NTTYDISC;
1592 ioctl (xforkin, TIOCSETD, &ldisc);
1593 }
1594 #endif
1595 #endif
1596 #ifdef TIOCNOTTY
1597 /* In 4.3BSD, the TIOCSPGRP bug has been fixed, and now you
1598 can do TIOCSPGRP only to the process's controlling tty. */
1599 if (pty_flag)
1600 {
1601 /* I wonder: would just ioctl (0, TIOCNOTTY, 0) work here?
1602 I can't test it since I don't have 4.3. */
1603 int j = open ("/dev/tty", O_RDWR, 0);
1604 ioctl (j, TIOCNOTTY, 0);
1605 close (j);
1606 #ifndef USG
1607 /* In order to get a controlling terminal on some versions
1608 of BSD, it is necessary to put the process in pgrp 0
1609 before it opens the terminal. */
1610 #ifdef HAVE_SETPGID
1611 setpgid (0, 0);
1612 #else
1613 setpgrp (0, 0);
1614 #endif
1615 #endif
1616 }
1617 #endif /* TIOCNOTTY */
1618
1619 #if !defined (RTU) && !defined (UNIPLUS) && !defined (DONT_REOPEN_PTY)
1620 /*** There is a suggestion that this ought to be a
1621 conditional on TIOCSPGRP,
1622 or !(defined (HAVE_SETSID) && defined (TIOCSCTTY)).
1623 Trying the latter gave the wrong results on Debian GNU/Linux 1.1;
1624 that system does seem to need this code, even though
1625 both HAVE_SETSID and TIOCSCTTY are defined. */
1626 /* Now close the pty (if we had it open) and reopen it.
1627 This makes the pty the controlling terminal of the subprocess. */
1628 if (pty_flag)
1629 {
1630 #ifdef SET_CHILD_PTY_PGRP
1631 int pgrp = getpid ();
1632 #endif
1633
1634 /* I wonder if close (open (pty_name, ...)) would work? */
1635 if (xforkin >= 0)
1636 close (xforkin);
1637 xforkout = xforkin = open (pty_name, O_RDWR, 0);
1638
1639 if (xforkin < 0)
1640 {
1641 write (1, "Couldn't open the pty terminal ", 31);
1642 write (1, pty_name, strlen (pty_name));
1643 write (1, "\n", 1);
1644 _exit (1);
1645 }
1646
1647 #ifdef SET_CHILD_PTY_PGRP
1648 ioctl (xforkin, TIOCSPGRP, &pgrp);
1649 ioctl (xforkout, TIOCSPGRP, &pgrp);
1650 #endif
1651 }
1652 #endif /* not UNIPLUS and not RTU and not DONT_REOPEN_PTY */
1653
1654 #ifdef SETUP_SLAVE_PTY
1655 if (pty_flag)
1656 {
1657 SETUP_SLAVE_PTY;
1658 }
1659 #endif /* SETUP_SLAVE_PTY */
1660 #ifdef AIX
1661 /* On AIX, we've disabled SIGHUP above once we start a child on a pty.
1662 Now reenable it in the child, so it will die when we want it to. */
1663 if (pty_flag)
1664 signal (SIGHUP, SIG_DFL);
1665 #endif
1666 #endif /* HAVE_PTYS */
1667
1668 signal (SIGINT, SIG_DFL);
1669 signal (SIGQUIT, SIG_DFL);
1670
1671 /* Stop blocking signals in the child. */
1672 #ifdef POSIX_SIGNALS
1673 sigprocmask (SIG_SETMASK, &procmask, 0);
1674 #else /* !POSIX_SIGNALS */
1675 #ifdef SIGCHLD
1676 #ifdef BSD4_1
1677 sigrelse (SIGCHLD);
1678 #else /* not BSD4_1 */
1679 #if defined (BSD_SYSTEM) || defined (UNIPLUS) || defined (HPUX)
1680 sigsetmask (SIGEMPTYMASK);
1681 #else /* ordinary USG */
1682 #if 0
1683 signal (SIGCHLD, sigchld);
1684 #endif
1685 #endif /* ordinary USG */
1686 #endif /* not BSD4_1 */
1687 #endif /* SIGCHLD */
1688 #endif /* !POSIX_SIGNALS */
1689
1690 if (pty_flag)
1691 child_setup_tty (xforkout);
1692 #ifdef WINDOWSNT
1693 pid = child_setup (xforkin, xforkout, xforkout,
1694 new_argv, 1, current_dir);
1695 #else /* not WINDOWSNT */
1696 child_setup (xforkin, xforkout, xforkout,
1697 new_argv, 1, current_dir);
1698 #endif /* not WINDOWSNT */
1699 }
1700 environ = save_environ;
1701 }
1702
1703 UNBLOCK_INPUT;
1704
1705 /* This runs in the Emacs process. */
1706 if (pid < 0)
1707 {
1708 if (forkin >= 0)
1709 close (forkin);
1710 if (forkin != forkout && forkout >= 0)
1711 close (forkout);
1712 }
1713 else
1714 {
1715 /* vfork succeeded. */
1716 XSETFASTINT (XPROCESS (process)->pid, pid);
1717
1718 #ifdef WINDOWSNT
1719 register_child (pid, inchannel);
1720 #endif /* WINDOWSNT */
1721
1722 /* If the subfork execv fails, and it exits,
1723 this close hangs. I don't know why.
1724 So have an interrupt jar it loose. */
1725 stop_polling ();
1726 signal (SIGALRM, create_process_1);
1727 alarm (1);
1728 XPROCESS (process)->subtty = Qnil;
1729 if (forkin >= 0)
1730 close (forkin);
1731 alarm (0);
1732 start_polling ();
1733 if (forkin != forkout && forkout >= 0)
1734 close (forkout);
1735
1736 #ifdef HAVE_PTYS
1737 if (pty_flag)
1738 XPROCESS (process)->tty_name = build_string (pty_name);
1739 else
1740 #endif
1741 XPROCESS (process)->tty_name = Qnil;
1742 }
1743
1744 /* Restore the signal state whether vfork succeeded or not.
1745 (We will signal an error, below, if it failed.) */
1746 #ifdef POSIX_SIGNALS
1747 #ifdef HAVE_VFORK
1748 /* Restore the parent's signal handlers. */
1749 sigaction (SIGINT, &sigint_action, 0);
1750 sigaction (SIGQUIT, &sigquit_action, 0);
1751 #ifdef AIX
1752 sigaction (SIGHUP, &sighup_action, 0);
1753 #endif
1754 #endif /* HAVE_VFORK */
1755 /* Stop blocking signals in the parent. */
1756 sigprocmask (SIG_SETMASK, &procmask, 0);
1757 #else /* !POSIX_SIGNALS */
1758 #ifdef SIGCHLD
1759 #ifdef BSD4_1
1760 sigrelse (SIGCHLD);
1761 #else /* not BSD4_1 */
1762 #if defined (BSD_SYSTEM) || defined (UNIPLUS) || defined (HPUX)
1763 sigsetmask (SIGEMPTYMASK);
1764 #else /* ordinary USG */
1765 #if 0
1766 signal (SIGCHLD, sigchld);
1767 /* Now really handle any of these signals
1768 that came in during this function. */
1769 if (sigchld_deferred)
1770 kill (getpid (), SIGCHLD);
1771 #endif
1772 #endif /* ordinary USG */
1773 #endif /* not BSD4_1 */
1774 #endif /* SIGCHLD */
1775 #endif /* !POSIX_SIGNALS */
1776
1777 /* Now generate the error if vfork failed. */
1778 if (pid < 0)
1779 report_file_error ("Doing vfork", Qnil);
1780 }
1781 #endif /* not VMS */
1782
1783 #ifdef HAVE_SOCKETS
1784
1785 /* open a TCP network connection to a given HOST/SERVICE. Treated
1786 exactly like a normal process when reading and writing. Only
1787 differences are in status display and process deletion. A network
1788 connection has no PID; you cannot signal it. All you can do is
1789 deactivate and close it via delete-process */
1790
1791 DEFUN ("open-network-stream", Fopen_network_stream, Sopen_network_stream,
1792 4, 4, 0,
1793 "Open a TCP connection for a service to a host.\n\
1794 Returns a subprocess-object to represent the connection.\n\
1795 Input and output work as for subprocesses; `delete-process' closes it.\n\
1796 Args are NAME BUFFER HOST SERVICE.\n\
1797 NAME is name for process. It is modified if necessary to make it unique.\n\
1798 BUFFER is the buffer (or buffer-name) to associate with the process.\n\
1799 Process output goes at end of that buffer, unless you specify\n\
1800 an output stream or filter function to handle the output.\n\
1801 BUFFER may be also nil, meaning that this process is not associated\n\
1802 with any buffer\n\
1803 Third arg is name of the host to connect to, or its IP address.\n\
1804 Fourth arg SERVICE is name of the service desired, or an integer\n\
1805 specifying a port number to connect to.")
1806 (name, buffer, host, service)
1807 Lisp_Object name, buffer, host, service;
1808 {
1809 Lisp_Object proc;
1810 register int i;
1811 struct sockaddr_in address;
1812 struct servent *svc_info;
1813 struct hostent *host_info_ptr, host_info;
1814 char *(addr_list[2]);
1815 IN_ADDR numeric_addr;
1816 int s, outch, inch;
1817 char errstring[80];
1818 int port;
1819 struct hostent host_info_fixed;
1820 struct gcpro gcpro1, gcpro2, gcpro3, gcpro4;
1821 int retry = 0;
1822 int count = specpdl_ptr - specpdl;
1823
1824 #ifdef WINDOWSNT
1825 /* Ensure socket support is loaded if available. */
1826 init_winsock (TRUE);
1827 #endif
1828
1829 GCPRO4 (name, buffer, host, service);
1830 CHECK_STRING (name, 0);
1831 CHECK_STRING (host, 0);
1832 if (INTEGERP (service))
1833 port = htons ((unsigned short) XINT (service));
1834 else
1835 {
1836 CHECK_STRING (service, 0);
1837 svc_info = getservbyname (XSTRING (service)->data, "tcp");
1838 if (svc_info == 0)
1839 error ("Unknown service \"%s\"", XSTRING (service)->data);
1840 port = svc_info->s_port;
1841 }
1842
1843 /* Slow down polling to every ten seconds.
1844 Some kernels have a bug which causes retrying connect to fail
1845 after a connect. Polling can interfere with gethostbyname too. */
1846 #ifdef POLL_FOR_INPUT
1847 bind_polling_period (10);
1848 #endif
1849
1850 #ifndef TERM
1851 while (1)
1852 {
1853 #ifdef TRY_AGAIN
1854 h_errno = 0;
1855 #endif
1856 immediate_quit = 1;
1857 QUIT;
1858 host_info_ptr = gethostbyname (XSTRING (host)->data);
1859 immediate_quit = 0;
1860 #ifdef TRY_AGAIN
1861 if (! (host_info_ptr == 0 && h_errno == TRY_AGAIN))
1862 #endif
1863 break;
1864 Fsleep_for (make_number (1), Qnil);
1865 }
1866 if (host_info_ptr == 0)
1867 /* Attempt to interpret host as numeric inet address */
1868 {
1869 numeric_addr = inet_addr ((char *) XSTRING (host)->data);
1870 if (NUMERIC_ADDR_ERROR)
1871 error ("Unknown host \"%s\"", XSTRING (host)->data);
1872
1873 host_info_ptr = &host_info;
1874 host_info.h_name = 0;
1875 host_info.h_aliases = 0;
1876 host_info.h_addrtype = AF_INET;
1877 #ifdef h_addr
1878 /* Older machines have only one address slot called h_addr.
1879 Newer machines have h_addr_list, but #define h_addr to
1880 be its first element. */
1881 host_info.h_addr_list = &(addr_list[0]);
1882 #endif
1883 host_info.h_addr = (char*)(&numeric_addr);
1884 addr_list[1] = 0;
1885 /* numeric_addr isn't null-terminated; it has fixed length. */
1886 host_info.h_length = sizeof (numeric_addr);
1887 }
1888
1889 bzero (&address, sizeof address);
1890 bcopy (host_info_ptr->h_addr, (char *) &address.sin_addr,
1891 host_info_ptr->h_length);
1892 address.sin_family = host_info_ptr->h_addrtype;
1893 address.sin_port = port;
1894
1895 s = socket (host_info_ptr->h_addrtype, SOCK_STREAM, 0);
1896 if (s < 0)
1897 report_file_error ("error creating socket", Fcons (name, Qnil));
1898
1899 /* Kernel bugs (on Ultrix at least) cause lossage (not just EINTR)
1900 when connect is interrupted. So let's not let it get interrupted.
1901 Note we do not turn off polling, because polling is only used
1902 when not interrupt_input, and thus not normally used on the systems
1903 which have this bug. On systems which use polling, there's no way
1904 to quit if polling is turned off. */
1905 if (interrupt_input)
1906 unrequest_sigio ();
1907
1908 loop:
1909
1910 immediate_quit = 1;
1911 QUIT;
1912
1913 if (connect (s, (struct sockaddr *) &address, sizeof address) == -1
1914 && errno != EISCONN)
1915 {
1916 int xerrno = errno;
1917
1918 immediate_quit = 0;
1919
1920 if (errno == EINTR)
1921 goto loop;
1922 if (errno == EADDRINUSE && retry < 20)
1923 {
1924 /* A delay here is needed on some FreeBSD systems,
1925 and it is harmless, since this retrying takes time anyway
1926 and should be infrequent. */
1927 Fsleep_for (make_number (1), Qnil);
1928 retry++;
1929 goto loop;
1930 }
1931
1932 close (s);
1933
1934 if (interrupt_input)
1935 request_sigio ();
1936
1937 errno = xerrno;
1938 report_file_error ("connection failed",
1939 Fcons (host, Fcons (name, Qnil)));
1940 }
1941
1942 immediate_quit = 0;
1943
1944 #ifdef POLL_FOR_INPUT
1945 unbind_to (count, Qnil);
1946 #endif
1947
1948 if (interrupt_input)
1949 request_sigio ();
1950
1951 #else /* TERM */
1952 s = connect_server (0);
1953 if (s < 0)
1954 report_file_error ("error creating socket", Fcons (name, Qnil));
1955 send_command (s, C_PORT, 0, "%s:%d", XSTRING (host)->data, ntohs (port));
1956 send_command (s, C_DUMB, 1, 0);
1957 #endif /* TERM */
1958
1959 inch = s;
1960 outch = s;
1961
1962 if (!NILP (buffer))
1963 buffer = Fget_buffer_create (buffer);
1964 proc = make_process (name);
1965
1966 chan_process[inch] = proc;
1967
1968 #ifdef O_NONBLOCK
1969 fcntl (inch, F_SETFL, O_NONBLOCK);
1970 #else
1971 #ifdef O_NDELAY
1972 fcntl (inch, F_SETFL, O_NDELAY);
1973 #endif
1974 #endif
1975
1976 XPROCESS (proc)->childp = Fcons (host, Fcons (service, Qnil));
1977 XPROCESS (proc)->command_channel_p = Qnil;
1978 XPROCESS (proc)->buffer = buffer;
1979 XPROCESS (proc)->sentinel = Qnil;
1980 XPROCESS (proc)->filter = Qnil;
1981 XPROCESS (proc)->command = Qnil;
1982 XPROCESS (proc)->pid = Qnil;
1983 XSETINT (XPROCESS (proc)->infd, inch);
1984 XSETINT (XPROCESS (proc)->outfd, outch);
1985 XPROCESS (proc)->status = Qrun;
1986 FD_SET (inch, &input_wait_mask);
1987 FD_SET (inch, &non_keyboard_wait_mask);
1988 if (inch > max_process_desc)
1989 max_process_desc = inch;
1990
1991 {
1992 /* Setup coding systems for communicating with the network stream. */
1993 struct gcpro gcpro1;
1994 /* Qt denotes we have not yet called Ffind_operation_coding_system. */
1995 Lisp_Object coding_systems = Qt;
1996 Lisp_Object args[5], val;
1997
1998 if (!NILP (Vcoding_system_for_read))
1999 val = Vcoding_system_for_read;
2000 else if (!NILP (buffer) && NILP (XBUFFER (buffer)->enable_multibyte_characters)
2001 || NILP (buffer) && NILP (buffer_defaults.enable_multibyte_characters))
2002 /* We dare not decode end-of-line format by setting VAL to
2003 Qraw_text, because the existing Emacs Lisp libraries
2004 assume that they receive bare code including a sequene of
2005 CR LF. */
2006 val = Qnil;
2007 else
2008 {
2009 args[0] = Qopen_network_stream, args[1] = name,
2010 args[2] = buffer, args[3] = host, args[4] = service;
2011 GCPRO1 (proc);
2012 coding_systems = Ffind_operation_coding_system (5, args);
2013 UNGCPRO;
2014 if (CONSP (coding_systems))
2015 val = XCONS (coding_systems)->car;
2016 else if (CONSP (Vdefault_process_coding_system))
2017 val = XCONS (Vdefault_process_coding_system)->car;
2018 else
2019 val = Qnil;
2020 }
2021 XPROCESS (proc)->decode_coding_system = val;
2022
2023 if (!NILP (Vcoding_system_for_write))
2024 val = Vcoding_system_for_write;
2025 else if (NILP (current_buffer->enable_multibyte_characters))
2026 val = Qnil;
2027 else
2028 {
2029 if (EQ (coding_systems, Qt))
2030 {
2031 args[0] = Qopen_network_stream, args[1] = name,
2032 args[2] = buffer, args[3] = host, args[4] = service;
2033 GCPRO1 (proc);
2034 coding_systems = Ffind_operation_coding_system (5, args);
2035 UNGCPRO;
2036 }
2037 if (CONSP (coding_systems))
2038 val = XCONS (coding_systems)->cdr;
2039 else if (CONSP (Vdefault_process_coding_system))
2040 val = XCONS (Vdefault_process_coding_system)->cdr;
2041 else
2042 val = Qnil;
2043 }
2044 XPROCESS (proc)->encode_coding_system = val;
2045 }
2046
2047 if (!proc_decode_coding_system[inch])
2048 proc_decode_coding_system[inch]
2049 = (struct coding_system *) xmalloc (sizeof (struct coding_system));
2050 setup_coding_system (XPROCESS (proc)->decode_coding_system,
2051 proc_decode_coding_system[inch]);
2052 if (!proc_encode_coding_system[outch])
2053 proc_encode_coding_system[outch]
2054 = (struct coding_system *) xmalloc (sizeof (struct coding_system));
2055 setup_coding_system (XPROCESS (proc)->encode_coding_system,
2056 proc_encode_coding_system[outch]);
2057
2058 XPROCESS (proc)->decoding_buf = make_uninit_string (0);
2059 XPROCESS (proc)->decoding_carryover = make_number (0);
2060 XPROCESS (proc)->encoding_buf = make_uninit_string (0);
2061 XPROCESS (proc)->encoding_carryover = make_number (0);
2062
2063 XPROCESS (proc)->inherit_coding_system_flag
2064 = (NILP (buffer) || !inherit_process_coding_system
2065 ? Qnil : Qt);
2066
2067 UNGCPRO;
2068 return proc;
2069 }
2070 #endif /* HAVE_SOCKETS */
2071
2072 void
2073 deactivate_process (proc)
2074 Lisp_Object proc;
2075 {
2076 register int inchannel, outchannel;
2077 register struct Lisp_Process *p = XPROCESS (proc);
2078
2079 inchannel = XINT (p->infd);
2080 outchannel = XINT (p->outfd);
2081
2082 if (inchannel >= 0)
2083 {
2084 /* Beware SIGCHLD hereabouts. */
2085 flush_pending_output (inchannel);
2086 #ifdef VMS
2087 {
2088 VMS_PROC_STUFF *get_vms_process_pointer (), *vs;
2089 sys$dassgn (outchannel);
2090 vs = get_vms_process_pointer (p->pid);
2091 if (vs)
2092 give_back_vms_process_stuff (vs);
2093 }
2094 #else
2095 close (inchannel);
2096 if (outchannel >= 0 && outchannel != inchannel)
2097 close (outchannel);
2098 #endif
2099
2100 XSETINT (p->infd, -1);
2101 XSETINT (p->outfd, -1);
2102 chan_process[inchannel] = Qnil;
2103 FD_CLR (inchannel, &input_wait_mask);
2104 FD_CLR (inchannel, &non_keyboard_wait_mask);
2105 if (inchannel == max_process_desc)
2106 {
2107 int i;
2108 /* We just closed the highest-numbered process input descriptor,
2109 so recompute the highest-numbered one now. */
2110 max_process_desc = 0;
2111 for (i = 0; i < MAXDESC; i++)
2112 if (!NILP (chan_process[i]))
2113 max_process_desc = i;
2114 }
2115 }
2116 }
2117
2118 /* Close all descriptors currently in use for communication
2119 with subprocess. This is used in a newly-forked subprocess
2120 to get rid of irrelevant descriptors. */
2121
2122 void
2123 close_process_descs ()
2124 {
2125 #ifndef WINDOWSNT
2126 int i;
2127 for (i = 0; i < MAXDESC; i++)
2128 {
2129 Lisp_Object process;
2130 process = chan_process[i];
2131 if (!NILP (process))
2132 {
2133 int in = XINT (XPROCESS (process)->infd);
2134 int out = XINT (XPROCESS (process)->outfd);
2135 if (in >= 0)
2136 close (in);
2137 if (out >= 0 && in != out)
2138 close (out);
2139 }
2140 }
2141 #endif
2142 }
2143 \f
2144 DEFUN ("accept-process-output", Faccept_process_output, Saccept_process_output,
2145 0, 3, 0,
2146 "Allow any pending output from subprocesses to be read by Emacs.\n\
2147 It is read into the process' buffers or given to their filter functions.\n\
2148 Non-nil arg PROCESS means do not return until some output has been received\n\
2149 from PROCESS.\n\
2150 Non-nil second arg TIMEOUT and third arg TIMEOUT-MSECS are number of\n\
2151 seconds and microseconds to wait; return after that much time whether\n\
2152 or not there is input.\n\
2153 Return non-nil iff we received any output before the timeout expired.")
2154 (process, timeout, timeout_msecs)
2155 register Lisp_Object process, timeout, timeout_msecs;
2156 {
2157 int seconds;
2158 int useconds;
2159
2160 if (! NILP (timeout_msecs))
2161 {
2162 CHECK_NUMBER (timeout_msecs, 2);
2163 useconds = XINT (timeout_msecs);
2164 if (!INTEGERP (timeout))
2165 XSETINT (timeout, 0);
2166
2167 {
2168 int carry = useconds / 1000000;
2169
2170 XSETINT (timeout, XINT (timeout) + carry);
2171 useconds -= carry * 1000000;
2172
2173 /* I think this clause is necessary because C doesn't
2174 guarantee a particular rounding direction for negative
2175 integers. */
2176 if (useconds < 0)
2177 {
2178 XSETINT (timeout, XINT (timeout) - 1);
2179 useconds += 1000000;
2180 }
2181 }
2182 }
2183 else
2184 useconds = 0;
2185
2186 if (! NILP (timeout))
2187 {
2188 CHECK_NUMBER (timeout, 1);
2189 seconds = XINT (timeout);
2190 if (seconds < 0 || (seconds == 0 && useconds == 0))
2191 seconds = -1;
2192 }
2193 else
2194 {
2195 if (NILP (process))
2196 seconds = -1;
2197 else
2198 seconds = 0;
2199 }
2200
2201 if (NILP (process))
2202 XSETFASTINT (process, 0);
2203
2204 return
2205 (wait_reading_process_input (seconds, useconds, process, 0)
2206 ? Qt : Qnil);
2207 }
2208
2209 /* This variable is different from waiting_for_input in keyboard.c.
2210 It is used to communicate to a lisp process-filter/sentinel (via the
2211 function Fwaiting_for_user_input_p below) whether emacs was waiting
2212 for user-input when that process-filter was called.
2213 waiting_for_input cannot be used as that is by definition 0 when
2214 lisp code is being evalled.
2215 This is also used in record_asynch_buffer_change.
2216 For that purpose, this must be 0
2217 when not inside wait_reading_process_input. */
2218 static int waiting_for_user_input_p;
2219
2220 /* This is here so breakpoints can be put on it. */
2221 static void
2222 wait_reading_process_input_1 ()
2223 {
2224 }
2225
2226 /* Read and dispose of subprocess output while waiting for timeout to
2227 elapse and/or keyboard input to be available.
2228
2229 TIME_LIMIT is:
2230 timeout in seconds, or
2231 zero for no limit, or
2232 -1 means gobble data immediately available but don't wait for any.
2233
2234 MICROSECS is:
2235 an additional duration to wait, measured in microseconds.
2236 If this is nonzero and time_limit is 0, then the timeout
2237 consists of MICROSECS only.
2238
2239 READ_KBD is a lisp value:
2240 0 to ignore keyboard input, or
2241 1 to return when input is available, or
2242 -1 meaning caller will actually read the input, so don't throw to
2243 the quit handler, or
2244 a cons cell, meaning wait until its car is non-nil
2245 (and gobble terminal input into the buffer if any arrives), or
2246 a process object, meaning wait until something arrives from that
2247 process. The return value is true iff we read some input from
2248 that process.
2249
2250 DO_DISPLAY != 0 means redisplay should be done to show subprocess
2251 output that arrives.
2252
2253 If READ_KBD is a pointer to a struct Lisp_Process, then the
2254 function returns true iff we received input from that process
2255 before the timeout elapsed.
2256 Otherwise, return true iff we received input from any process. */
2257
2258 int
2259 wait_reading_process_input (time_limit, microsecs, read_kbd, do_display)
2260 int time_limit, microsecs;
2261 Lisp_Object read_kbd;
2262 int do_display;
2263 {
2264 register int channel, nfds, m;
2265 static SELECT_TYPE Available;
2266 int xerrno;
2267 Lisp_Object proc;
2268 EMACS_TIME timeout, end_time, garbage;
2269 SELECT_TYPE Atemp;
2270 int wait_channel = -1;
2271 struct Lisp_Process *wait_proc = 0;
2272 int got_some_input = 0;
2273 Lisp_Object *wait_for_cell = 0;
2274
2275 FD_ZERO (&Available);
2276
2277 /* If read_kbd is a process to watch, set wait_proc and wait_channel
2278 accordingly. */
2279 if (PROCESSP (read_kbd))
2280 {
2281 wait_proc = XPROCESS (read_kbd);
2282 wait_channel = XINT (wait_proc->infd);
2283 XSETFASTINT (read_kbd, 0);
2284 }
2285
2286 /* If waiting for non-nil in a cell, record where. */
2287 if (CONSP (read_kbd))
2288 {
2289 wait_for_cell = &XCONS (read_kbd)->car;
2290 XSETFASTINT (read_kbd, 0);
2291 }
2292
2293 waiting_for_user_input_p = XINT (read_kbd);
2294
2295 /* Since we may need to wait several times,
2296 compute the absolute time to return at. */
2297 if (time_limit || microsecs)
2298 {
2299 EMACS_GET_TIME (end_time);
2300 EMACS_SET_SECS_USECS (timeout, time_limit, microsecs);
2301 EMACS_ADD_TIME (end_time, end_time, timeout);
2302 }
2303 #ifdef hpux
2304 /* AlainF 5-Jul-1996
2305 HP-UX 10.10 seem to have problems with signals coming in
2306 Causes "poll: interrupted system call" messages when Emacs is run
2307 in an X window
2308 Turn off periodic alarms (in case they are in use) */
2309 stop_polling ();
2310 #endif
2311
2312 while (1)
2313 {
2314 int timeout_reduced_for_timers = 0;
2315
2316 /* If calling from keyboard input, do not quit
2317 since we want to return C-g as an input character.
2318 Otherwise, do pending quit if requested. */
2319 if (XINT (read_kbd) >= 0)
2320 QUIT;
2321
2322 /* Exit now if the cell we're waiting for became non-nil. */
2323 if (wait_for_cell && ! NILP (*wait_for_cell))
2324 break;
2325
2326 /* Compute time from now till when time limit is up */
2327 /* Exit if already run out */
2328 if (time_limit == -1)
2329 {
2330 /* -1 specified for timeout means
2331 gobble output available now
2332 but don't wait at all. */
2333
2334 EMACS_SET_SECS_USECS (timeout, 0, 0);
2335 }
2336 else if (time_limit || microsecs)
2337 {
2338 EMACS_GET_TIME (timeout);
2339 EMACS_SUB_TIME (timeout, end_time, timeout);
2340 if (EMACS_TIME_NEG_P (timeout))
2341 break;
2342 }
2343 else
2344 {
2345 EMACS_SET_SECS_USECS (timeout, 100000, 0);
2346 }
2347
2348 /* Normally we run timers here.
2349 But not if wait_for_cell; in those cases,
2350 the wait is supposed to be short,
2351 and those callers cannot handle running arbitrary Lisp code here. */
2352 if (! wait_for_cell)
2353 {
2354 EMACS_TIME timer_delay;
2355 int old_timers_run;
2356
2357 retry:
2358 old_timers_run = timers_run;
2359 timer_delay = timer_check (1);
2360 if (timers_run != old_timers_run && do_display)
2361 {
2362 redisplay_preserve_echo_area ();
2363 /* We must retry, since a timer may have requeued itself
2364 and that could alter the time_delay. */
2365 goto retry;
2366 }
2367
2368 /* If there is unread keyboard input, also return. */
2369 if (XINT (read_kbd) != 0
2370 && requeued_events_pending_p ())
2371 break;
2372
2373 if (! EMACS_TIME_NEG_P (timer_delay) && time_limit != -1)
2374 {
2375 EMACS_TIME difference;
2376 EMACS_SUB_TIME (difference, timer_delay, timeout);
2377 if (EMACS_TIME_NEG_P (difference))
2378 {
2379 timeout = timer_delay;
2380 timeout_reduced_for_timers = 1;
2381 }
2382 }
2383 /* If time_limit is -1, we are not going to wait at all. */
2384 else if (time_limit != -1)
2385 {
2386 /* This is so a breakpoint can be put here. */
2387 wait_reading_process_input_1 ();
2388 }
2389 }
2390
2391 /* Cause C-g and alarm signals to take immediate action,
2392 and cause input available signals to zero out timeout.
2393
2394 It is important that we do this before checking for process
2395 activity. If we get a SIGCHLD after the explicit checks for
2396 process activity, timeout is the only way we will know. */
2397 if (XINT (read_kbd) < 0)
2398 set_waiting_for_input (&timeout);
2399
2400 /* If status of something has changed, and no input is
2401 available, notify the user of the change right away. After
2402 this explicit check, we'll let the SIGCHLD handler zap
2403 timeout to get our attention. */
2404 if (update_tick != process_tick && do_display)
2405 {
2406 Atemp = input_wait_mask;
2407 EMACS_SET_SECS_USECS (timeout, 0, 0);
2408 if ((select (max (max_process_desc, max_keyboard_desc) + 1,
2409 &Atemp, (SELECT_TYPE *)0, (SELECT_TYPE *)0,
2410 &timeout)
2411 <= 0))
2412 {
2413 /* It's okay for us to do this and then continue with
2414 the loop, since timeout has already been zeroed out. */
2415 clear_waiting_for_input ();
2416 status_notify ();
2417 }
2418 }
2419
2420 /* Don't wait for output from a non-running process. */
2421 if (wait_proc != 0 && !NILP (wait_proc->raw_status_low))
2422 update_status (wait_proc);
2423 if (wait_proc != 0
2424 && ! EQ (wait_proc->status, Qrun))
2425 {
2426 int nread, total_nread = 0;
2427
2428 clear_waiting_for_input ();
2429 XSETPROCESS (proc, wait_proc);
2430
2431 /* Read data from the process, until we exhaust it. */
2432 while (XINT (wait_proc->infd) >= 0
2433 && (nread
2434 = read_process_output (proc, XINT (wait_proc->infd))))
2435 {
2436 if (0 < nread)
2437 total_nread += nread;
2438 #ifdef EIO
2439 else if (nread == -1 && EIO == errno)
2440 break;
2441 #endif
2442 }
2443 if (total_nread > 0 && do_display)
2444 redisplay_preserve_echo_area ();
2445
2446 break;
2447 }
2448
2449 /* Wait till there is something to do */
2450
2451 if (wait_for_cell)
2452 Available = non_process_wait_mask;
2453 else if (! XINT (read_kbd))
2454 Available = non_keyboard_wait_mask;
2455 else
2456 Available = input_wait_mask;
2457
2458 /* If frame size has changed or the window is newly mapped,
2459 redisplay now, before we start to wait. There is a race
2460 condition here; if a SIGIO arrives between now and the select
2461 and indicates that a frame is trashed, the select may block
2462 displaying a trashed screen. */
2463 if (frame_garbaged && do_display)
2464 {
2465 clear_waiting_for_input ();
2466 redisplay_preserve_echo_area ();
2467 if (XINT (read_kbd) < 0)
2468 set_waiting_for_input (&timeout);
2469 }
2470
2471 if (XINT (read_kbd) && detect_input_pending ())
2472 {
2473 nfds = 0;
2474 FD_ZERO (&Available);
2475 }
2476 else
2477 nfds = select (max (max_process_desc, max_keyboard_desc) + 1,
2478 &Available, (SELECT_TYPE *)0, (SELECT_TYPE *)0,
2479 &timeout);
2480
2481 xerrno = errno;
2482
2483 /* Make C-g and alarm signals set flags again */
2484 clear_waiting_for_input ();
2485
2486 /* If we woke up due to SIGWINCH, actually change size now. */
2487 do_pending_window_change ();
2488
2489 if (time_limit && nfds == 0 && ! timeout_reduced_for_timers)
2490 /* We wanted the full specified time, so return now. */
2491 break;
2492 if (nfds < 0)
2493 {
2494 if (xerrno == EINTR)
2495 FD_ZERO (&Available);
2496 #ifdef ultrix
2497 /* Ultrix select seems to return ENOMEM when it is
2498 interrupted. Treat it just like EINTR. Bleah. Note
2499 that we want to test for the "ultrix" CPP symbol, not
2500 "__ultrix__"; the latter is only defined under GCC, but
2501 not by DEC's bundled CC. -JimB */
2502 else if (xerrno == ENOMEM)
2503 FD_ZERO (&Available);
2504 #endif
2505 #ifdef ALLIANT
2506 /* This happens for no known reason on ALLIANT.
2507 I am guessing that this is the right response. -- RMS. */
2508 else if (xerrno == EFAULT)
2509 FD_ZERO (&Available);
2510 #endif
2511 else if (xerrno == EBADF)
2512 {
2513 #ifdef AIX
2514 /* AIX doesn't handle PTY closure the same way BSD does. On AIX,
2515 the child's closure of the pts gives the parent a SIGHUP, and
2516 the ptc file descriptor is automatically closed,
2517 yielding EBADF here or at select() call above.
2518 So, SIGHUP is ignored (see def of PTY_TTY_NAME_SPRINTF
2519 in m/ibmrt-aix.h), and here we just ignore the select error.
2520 Cleanup occurs c/o status_notify after SIGCLD. */
2521 FD_ZERO (&Available); /* Cannot depend on values returned */
2522 #else
2523 abort ();
2524 #endif
2525 }
2526 else
2527 error ("select error: %s", strerror (xerrno));
2528 }
2529 #if defined(sun) && !defined(USG5_4)
2530 else if (nfds > 0 && keyboard_bit_set (&Available)
2531 && interrupt_input)
2532 /* System sometimes fails to deliver SIGIO.
2533
2534 David J. Mackenzie says that Emacs doesn't compile under
2535 Solaris if this code is enabled, thus the USG5_4 in the CPP
2536 conditional. "I haven't noticed any ill effects so far.
2537 If you find a Solaris expert somewhere, they might know
2538 better." */
2539 kill (getpid (), SIGIO);
2540 #endif
2541
2542 #if 0 /* When polling is used, interrupt_input is 0,
2543 so get_input_pending should read the input.
2544 So this should not be needed. */
2545 /* If we are using polling for input,
2546 and we see input available, make it get read now.
2547 Otherwise it might not actually get read for a second.
2548 And on hpux, since we turn off polling in wait_reading_process_input,
2549 it might never get read at all if we don't spend much time
2550 outside of wait_reading_process_input. */
2551 if (XINT (read_kbd) && interrupt_input
2552 && keyboard_bit_set (&Available)
2553 && input_polling_used ())
2554 kill (getpid (), SIGALRM);
2555 #endif
2556
2557 /* Check for keyboard input */
2558 /* If there is any, return immediately
2559 to give it higher priority than subprocesses */
2560
2561 if (XINT (read_kbd) != 0
2562 && detect_input_pending_run_timers (do_display))
2563 {
2564 swallow_events (do_display);
2565 if (detect_input_pending_run_timers (do_display))
2566 break;
2567 }
2568
2569 /* If there is unread keyboard input, also return. */
2570 if (XINT (read_kbd) != 0
2571 && requeued_events_pending_p ())
2572 break;
2573
2574 /* If we are not checking for keyboard input now,
2575 do process events (but don't run any timers).
2576 This is so that X events will be processed.
2577 Otherwise they may have to wait until polling takes place.
2578 That would causes delays in pasting selections, for example.
2579
2580 (We used to do this only if wait_for_cell.) */
2581 if (XINT (read_kbd) == 0 && detect_input_pending ())
2582 {
2583 swallow_events (do_display);
2584 #if 0 /* Exiting when read_kbd doesn't request that seems wrong, though. */
2585 if (detect_input_pending ())
2586 break;
2587 #endif
2588 }
2589
2590 /* Exit now if the cell we're waiting for became non-nil. */
2591 if (wait_for_cell && ! NILP (*wait_for_cell))
2592 break;
2593
2594 #ifdef SIGIO
2595 /* If we think we have keyboard input waiting, but didn't get SIGIO,
2596 go read it. This can happen with X on BSD after logging out.
2597 In that case, there really is no input and no SIGIO,
2598 but select says there is input. */
2599
2600 if (XINT (read_kbd) && interrupt_input
2601 && keyboard_bit_set (&Available))
2602 kill (getpid (), SIGIO);
2603 #endif
2604
2605 if (! wait_proc)
2606 got_some_input |= nfds > 0;
2607
2608 /* If checking input just got us a size-change event from X,
2609 obey it now if we should. */
2610 if (XINT (read_kbd) || wait_for_cell)
2611 do_pending_window_change ();
2612
2613 /* Check for data from a process. */
2614 /* Really FIRST_PROC_DESC should be 0 on Unix,
2615 but this is safer in the short run. */
2616 for (channel = 0; channel <= max_process_desc; channel++)
2617 {
2618 if (FD_ISSET (channel, &Available)
2619 && FD_ISSET (channel, &non_keyboard_wait_mask))
2620 {
2621 int nread;
2622
2623 /* If waiting for this channel, arrange to return as
2624 soon as no more input to be processed. No more
2625 waiting. */
2626 if (wait_channel == channel)
2627 {
2628 wait_channel = -1;
2629 time_limit = -1;
2630 got_some_input = 1;
2631 }
2632 proc = chan_process[channel];
2633 if (NILP (proc))
2634 continue;
2635
2636 /* Read data from the process, starting with our
2637 buffered-ahead character if we have one. */
2638
2639 nread = read_process_output (proc, channel);
2640 if (nread > 0)
2641 {
2642 /* Since read_process_output can run a filter,
2643 which can call accept-process-output,
2644 don't try to read from any other processes
2645 before doing the select again. */
2646 FD_ZERO (&Available);
2647
2648 if (do_display)
2649 redisplay_preserve_echo_area ();
2650 }
2651 #ifdef EWOULDBLOCK
2652 else if (nread == -1 && errno == EWOULDBLOCK)
2653 ;
2654 #endif
2655 /* ISC 4.1 defines both EWOULDBLOCK and O_NONBLOCK,
2656 and Emacs uses O_NONBLOCK, so what we get is EAGAIN. */
2657 #ifdef O_NONBLOCK
2658 else if (nread == -1 && errno == EAGAIN)
2659 ;
2660 #else
2661 #ifdef O_NDELAY
2662 else if (nread == -1 && errno == EAGAIN)
2663 ;
2664 /* Note that we cannot distinguish between no input
2665 available now and a closed pipe.
2666 With luck, a closed pipe will be accompanied by
2667 subprocess termination and SIGCHLD. */
2668 else if (nread == 0 && !NETCONN_P (proc))
2669 ;
2670 #endif /* O_NDELAY */
2671 #endif /* O_NONBLOCK */
2672 #ifdef HAVE_PTYS
2673 /* On some OSs with ptys, when the process on one end of
2674 a pty exits, the other end gets an error reading with
2675 errno = EIO instead of getting an EOF (0 bytes read).
2676 Therefore, if we get an error reading and errno =
2677 EIO, just continue, because the child process has
2678 exited and should clean itself up soon (e.g. when we
2679 get a SIGCHLD). */
2680 else if (nread == -1 && errno == EIO)
2681 ;
2682 #endif /* HAVE_PTYS */
2683 /* If we can detect process termination, don't consider the process
2684 gone just because its pipe is closed. */
2685 #ifdef SIGCHLD
2686 else if (nread == 0 && !NETCONN_P (proc))
2687 ;
2688 #endif
2689 else
2690 {
2691 /* Preserve status of processes already terminated. */
2692 XSETINT (XPROCESS (proc)->tick, ++process_tick);
2693 deactivate_process (proc);
2694 if (!NILP (XPROCESS (proc)->raw_status_low))
2695 update_status (XPROCESS (proc));
2696 if (EQ (XPROCESS (proc)->status, Qrun))
2697 XPROCESS (proc)->status
2698 = Fcons (Qexit, Fcons (make_number (256), Qnil));
2699 }
2700 }
2701 } /* end for each file descriptor */
2702 } /* end while exit conditions not met */
2703
2704 waiting_for_user_input_p = 0;
2705
2706 /* If calling from keyboard input, do not quit
2707 since we want to return C-g as an input character.
2708 Otherwise, do pending quit if requested. */
2709 if (XINT (read_kbd) >= 0)
2710 {
2711 /* Prevent input_pending from remaining set if we quit. */
2712 clear_input_pending ();
2713 QUIT;
2714 }
2715 #ifdef hpux
2716 /* AlainF 5-Jul-1996
2717 HP-UX 10.10 seems to have problems with signals coming in
2718 Causes "poll: interrupted system call" messages when Emacs is run
2719 in an X window
2720 Turn periodic alarms back on */
2721 start_polling ();
2722 #endif
2723
2724 return got_some_input;
2725 }
2726 \f
2727 /* Given a list (FUNCTION ARGS...), apply FUNCTION to the ARGS. */
2728
2729 static Lisp_Object
2730 read_process_output_call (fun_and_args)
2731 Lisp_Object fun_and_args;
2732 {
2733 return apply1 (XCONS (fun_and_args)->car, XCONS (fun_and_args)->cdr);
2734 }
2735
2736 static Lisp_Object
2737 read_process_output_error_handler (error)
2738 Lisp_Object error;
2739 {
2740 cmd_error_internal (error, "error in process filter: ");
2741 Vinhibit_quit = Qt;
2742 update_echo_area ();
2743 Fsleep_for (make_number (2), Qnil);
2744 }
2745
2746 /* Read pending output from the process channel,
2747 starting with our buffered-ahead character if we have one.
2748 Yield number of decoded characters read.
2749
2750 This function reads at most 1024 characters.
2751 If you want to read all available subprocess output,
2752 you must call it repeatedly until it returns zero.
2753
2754 The characters read are decoded according to PROC's coding-system
2755 for decoding. */
2756
2757 int
2758 read_process_output (proc, channel)
2759 Lisp_Object proc;
2760 register int channel;
2761 {
2762 register int nchars, nbytes;
2763 char *chars;
2764 #ifdef VMS
2765 int chars_allocated = 0; /* If 1, `chars' should be freed later. */
2766 #else
2767 char buf[1024];
2768 #endif
2769 register Lisp_Object outstream;
2770 register struct buffer *old = current_buffer;
2771 register struct Lisp_Process *p = XPROCESS (proc);
2772 register int opoint;
2773 struct coding_system *coding = proc_decode_coding_system[channel];
2774 int chars_in_decoding_buf = 0; /* If 1, `chars' points
2775 XSTRING (p->decoding_buf)->data. */
2776 int carryover = XINT (p->decoding_carryover);
2777
2778 #ifdef VMS
2779 VMS_PROC_STUFF *vs, *get_vms_process_pointer();
2780
2781 vs = get_vms_process_pointer (p->pid);
2782 if (vs)
2783 {
2784 if (!vs->iosb[0])
2785 return(0); /* Really weird if it does this */
2786 if (!(vs->iosb[0] & 1))
2787 return -1; /* I/O error */
2788 }
2789 else
2790 error ("Could not get VMS process pointer");
2791 chars = vs->inputBuffer;
2792 nbytes = clean_vms_buffer (chars, vs->iosb[1]);
2793 if (nbytes <= 0)
2794 {
2795 start_vms_process_read (vs); /* Crank up the next read on the process */
2796 return 1; /* Nothing worth printing, say we got 1 */
2797 }
2798 if (carryover > 0)
2799 {
2800 /* The data carried over in the previous decoding (which are at
2801 the tail of decoding buffer) should be prepended to the new
2802 data read to decode all together. */
2803 char *buf = (char *) xmalloc (nbytes + carryover);
2804
2805 bcopy (XSTRING (p->decoding_buf)->data
2806 + STRING_BYTES (XSTRING (p->decoding_buf)) - carryover,
2807 buf, carryover);
2808 bcopy (chars, buf + carryover, nbytes);
2809 chars = buf;
2810 chars_allocated = 1;
2811 }
2812 #else /* not VMS */
2813
2814 if (carryover)
2815 /* See the comment above. */
2816 bcopy (XSTRING (p->decoding_buf)->data
2817 + STRING_BYTES (XSTRING (p->decoding_buf)) - carryover,
2818 buf, carryover);
2819
2820 if (proc_buffered_char[channel] < 0)
2821 nbytes = read (channel, buf + carryover, (sizeof buf) - carryover);
2822 else
2823 {
2824 buf[carryover] = proc_buffered_char[channel];
2825 proc_buffered_char[channel] = -1;
2826 nbytes = read (channel, buf + carryover + 1,
2827 (sizeof buf) - carryover - 1);
2828 if (nbytes < 0)
2829 nbytes = 1;
2830 else
2831 nbytes = nbytes + 1;
2832 }
2833 chars = buf;
2834 #endif /* not VMS */
2835
2836 XSETINT (p->decoding_carryover, 0);
2837
2838 /* At this point, NBYTES holds number of characters just received
2839 (including the one in proc_buffered_char[channel]). */
2840 if (nbytes <= 0) return nbytes;
2841
2842 /* Now set NBYTES how many bytes we must decode. */
2843 nbytes += carryover;
2844 nchars = nbytes;
2845
2846 if (CODING_MAY_REQUIRE_DECODING (coding))
2847 {
2848 int require = decoding_buffer_size (coding, nbytes);
2849 int result;
2850
2851 if (STRING_BYTES (XSTRING (p->decoding_buf)) < require)
2852 p->decoding_buf = make_uninit_string (require);
2853 result = decode_coding (coding, chars, XSTRING (p->decoding_buf)->data,
2854 nbytes, STRING_BYTES (XSTRING (p->decoding_buf)));
2855 carryover = nbytes - coding->consumed;
2856 if (carryover > 0)
2857 {
2858 /* Copy the carryover bytes to the end of p->decoding_buf, to
2859 be processed on the next read. Since decoding_buffer_size
2860 asks for an extra amount of space beyond the maximum
2861 expected for the output, there should always be sufficient
2862 space for the carryover (which is by definition a sequence
2863 of bytes that was not long enough to be decoded, and thus
2864 has a bounded length). */
2865 if (STRING_BYTES (XSTRING (p->decoding_buf))
2866 < coding->produced + carryover)
2867 abort ();
2868 bcopy (chars + coding->consumed,
2869 XSTRING (p->decoding_buf)->data
2870 + STRING_BYTES (XSTRING (p->decoding_buf)) - carryover,
2871 carryover);
2872 XSETINT (p->decoding_carryover, carryover);
2873 }
2874
2875 /* A new coding system might be found by `decode_coding'. */
2876 if (!EQ (p->decode_coding_system, coding->symbol))
2877 {
2878 p->decode_coding_system = coding->symbol;
2879
2880 /* Don't call setup_coding_system for
2881 proc_decode_coding_system[channel] here. It is done in
2882 detect_coding called via decode_coding above. */
2883
2884 /* If a coding system for encoding is not yet decided, we set
2885 it as the same as coding-system for decoding.
2886
2887 But, before doing that we must check if
2888 proc_encode_coding_system[p->outfd] surely points to a
2889 valid memory because p->outfd will be changed once EOF is
2890 sent to the process. */
2891 if (NILP (p->encode_coding_system)
2892 && proc_encode_coding_system[XINT (p->outfd)])
2893 {
2894 p->encode_coding_system = coding->symbol;
2895 setup_coding_system (coding->symbol,
2896 proc_encode_coding_system[XINT (p->outfd)]);
2897 }
2898 }
2899
2900 #ifdef VMS
2901 /* Now we don't need the contents of `chars'. */
2902 if (chars_allocated)
2903 free (chars);
2904 #endif
2905 if (coding->produced == 0)
2906 return 0;
2907 chars = (char *) XSTRING (p->decoding_buf)->data;
2908 nbytes = coding->produced;
2909 nchars = (coding->fake_multibyte
2910 ? multibyte_chars_in_text (chars, nbytes)
2911 : coding->produced_char);
2912 chars_in_decoding_buf = 1;
2913 }
2914 #ifdef VMS
2915 else if (chars_allocated)
2916 {
2917 /* Although we don't have to decode the received data, we must
2918 move it to an area which we don't have to free. */
2919 if (! STRINGP (p->decoding_buf)
2920 || STRING_BYTES (XSTRING (p->decoding_buf)) < nbytes)
2921 p->decoding_buf = make_uninit_string (nbytes);
2922 bcopy (chars, XSTRING (p->decoding_buf)->data, nbytes);
2923 free (chars);
2924 chars = XSTRING (p->decoding_buf)->data;
2925 nchars = multibyte_chars_in_text (chars, nbytes);
2926 chars_in_decoding_buf = 1;
2927 }
2928 #endif
2929
2930 Vlast_coding_system_used = coding->symbol;
2931
2932 /* If the caller required, let the process associated buffer
2933 inherit the coding-system used to decode the process output. */
2934 if (! NILP (p->inherit_coding_system_flag)
2935 && !NILP (p->buffer) && !NILP (XBUFFER (p->buffer)->name))
2936 {
2937 struct buffer *prev_buf = current_buffer;
2938
2939 Fset_buffer (p->buffer);
2940 call1 (intern ("after-insert-file-set-buffer-file-coding-system"),
2941 make_number (nbytes));
2942 set_buffer_internal (prev_buf);
2943 }
2944
2945 /* Read and dispose of the process output. */
2946 outstream = p->filter;
2947 if (!NILP (outstream))
2948 {
2949 /* We inhibit quit here instead of just catching it so that
2950 hitting ^G when a filter happens to be running won't screw
2951 it up. */
2952 int count = specpdl_ptr - specpdl;
2953 Lisp_Object odeactivate;
2954 Lisp_Object obuffer, okeymap;
2955 Lisp_Object text;
2956 int outer_running_asynch_code = running_asynch_code;
2957
2958 /* No need to gcpro these, because all we do with them later
2959 is test them for EQness, and none of them should be a string. */
2960 odeactivate = Vdeactivate_mark;
2961 XSETBUFFER (obuffer, current_buffer);
2962 okeymap = current_buffer->keymap;
2963
2964 specbind (Qinhibit_quit, Qt);
2965 specbind (Qlast_nonmenu_event, Qt);
2966
2967 /* In case we get recursively called,
2968 and we already saved the match data nonrecursively,
2969 save the same match data in safely recursive fashion. */
2970 if (outer_running_asynch_code)
2971 {
2972 Lisp_Object tem;
2973 /* Don't clobber the CURRENT match data, either! */
2974 tem = Fmatch_data (Qnil, Qnil);
2975 restore_match_data ();
2976 record_unwind_protect (Fset_match_data, Fmatch_data (Qnil, Qnil));
2977 Fset_match_data (tem);
2978 }
2979
2980 /* For speed, if a search happens within this code,
2981 save the match data in a special nonrecursive fashion. */
2982 running_asynch_code = 1;
2983
2984 text = make_string_from_bytes (chars, nchars, nbytes);
2985 internal_condition_case_1 (read_process_output_call,
2986 Fcons (outstream,
2987 Fcons (proc, Fcons (text, Qnil))),
2988 !NILP (Vdebug_on_error) ? Qnil : Qerror,
2989 read_process_output_error_handler);
2990
2991 /* If we saved the match data nonrecursively, restore it now. */
2992 restore_match_data ();
2993 running_asynch_code = outer_running_asynch_code;
2994
2995 /* Handling the process output should not deactivate the mark. */
2996 Vdeactivate_mark = odeactivate;
2997
2998 #if 0 /* Call record_asynch_buffer_change unconditionally,
2999 because we might have changed minor modes or other things
3000 that affect key bindings. */
3001 if (! EQ (Fcurrent_buffer (), obuffer)
3002 || ! EQ (current_buffer->keymap, okeymap))
3003 #endif
3004 /* But do it only if the caller is actually going to read events.
3005 Otherwise there's no need to make him wake up, and it could
3006 cause trouble (for example it would make Fsit_for return). */
3007 if (waiting_for_user_input_p == -1)
3008 record_asynch_buffer_change ();
3009
3010 #ifdef VMS
3011 start_vms_process_read (vs);
3012 #endif
3013 unbind_to (count, Qnil);
3014 return nchars;
3015 }
3016
3017 /* If no filter, write into buffer if it isn't dead. */
3018 if (!NILP (p->buffer) && !NILP (XBUFFER (p->buffer)->name))
3019 {
3020 Lisp_Object old_read_only;
3021 int old_begv, old_zv;
3022 int old_begv_byte, old_zv_byte;
3023 Lisp_Object odeactivate;
3024 int before, before_byte;
3025 int opoint_byte;
3026
3027 odeactivate = Vdeactivate_mark;
3028
3029 Fset_buffer (p->buffer);
3030 opoint = PT;
3031 opoint_byte = PT_BYTE;
3032 old_read_only = current_buffer->read_only;
3033 old_begv = BEGV;
3034 old_zv = ZV;
3035 old_begv_byte = BEGV_BYTE;
3036 old_zv_byte = ZV_BYTE;
3037
3038 current_buffer->read_only = Qnil;
3039
3040 /* Insert new output into buffer
3041 at the current end-of-output marker,
3042 thus preserving logical ordering of input and output. */
3043 if (XMARKER (p->mark)->buffer)
3044 SET_PT_BOTH (clip_to_bounds (BEGV, marker_position (p->mark), ZV),
3045 clip_to_bounds (BEGV_BYTE, marker_byte_position (p->mark),
3046 ZV_BYTE));
3047 else
3048 SET_PT_BOTH (ZV, ZV_BYTE);
3049 before = PT;
3050 before_byte = PT_BYTE;
3051
3052 /* If the output marker is outside of the visible region, save
3053 the restriction and widen. */
3054 if (! (BEGV <= PT && PT <= ZV))
3055 Fwiden ();
3056
3057 /* Insert before markers in case we are inserting where
3058 the buffer's mark is, and the user's next command is Meta-y. */
3059 if (chars_in_decoding_buf)
3060 {
3061 /* Since multibyteness of p->docoding_buf is corrupted, we
3062 can't use insert_from_string_before_markers. */
3063 char *temp_buf;
3064
3065 temp_buf = (char *) alloca (nbytes);
3066 bcopy (XSTRING (p->decoding_buf)->data, temp_buf, nbytes);
3067 insert_before_markers (temp_buf, nbytes);
3068 }
3069 else
3070 insert_1_both (chars, nchars, nbytes, 0, 1, 1);
3071 set_marker_both (p->mark, p->buffer, PT, PT_BYTE);
3072
3073 update_mode_lines++;
3074
3075 /* Make sure opoint and the old restrictions
3076 float ahead of any new text just as point would. */
3077 if (opoint >= before)
3078 {
3079 opoint += PT - before;
3080 opoint_byte += PT_BYTE - before_byte;
3081 }
3082 if (old_begv > before)
3083 {
3084 old_begv += PT - before;
3085 old_begv_byte += PT_BYTE - before_byte;
3086 }
3087 if (old_zv >= before)
3088 {
3089 old_zv += PT - before;
3090 old_zv_byte += PT_BYTE - before_byte;
3091 }
3092
3093 /* If the restriction isn't what it should be, set it. */
3094 if (old_begv != BEGV || old_zv != ZV)
3095 Fnarrow_to_region (make_number (old_begv), make_number (old_zv));
3096
3097 /* Handling the process output should not deactivate the mark. */
3098 Vdeactivate_mark = odeactivate;
3099
3100 current_buffer->read_only = old_read_only;
3101 SET_PT_BOTH (opoint, opoint_byte);
3102 set_buffer_internal (old);
3103 }
3104 #ifdef VMS
3105 start_vms_process_read (vs);
3106 #endif
3107 return nbytes;
3108 }
3109
3110 DEFUN ("waiting-for-user-input-p", Fwaiting_for_user_input_p, Swaiting_for_user_input_p,
3111 0, 0, 0,
3112 "Returns non-nil if emacs is waiting for input from the user.\n\
3113 This is intended for use by asynchronous process output filters and sentinels.")
3114 ()
3115 {
3116 return (waiting_for_user_input_p ? Qt : Qnil);
3117 }
3118 \f
3119 /* Sending data to subprocess */
3120
3121 jmp_buf send_process_frame;
3122
3123 SIGTYPE
3124 send_process_trap ()
3125 {
3126 #ifdef BSD4_1
3127 sigrelse (SIGPIPE);
3128 sigrelse (SIGALRM);
3129 #endif /* BSD4_1 */
3130 longjmp (send_process_frame, 1);
3131 }
3132
3133 /* Send some data to process PROC.
3134 BUF is the beginning of the data; LEN is the number of characters.
3135 OBJECT is the Lisp object that the data comes from.
3136
3137 The data is encoded by PROC's coding-system for encoding before it
3138 is sent. But if the data ends at the middle of multi-byte
3139 representation, that incomplete sequence of bytes are sent without
3140 being encoded. Should we store them in a buffer to prepend them to
3141 the data send later? */
3142
3143 void
3144 send_process (proc, buf, len, object)
3145 volatile Lisp_Object proc;
3146 unsigned char *buf;
3147 int len;
3148 Lisp_Object object;
3149 {
3150 /* Use volatile to protect variables from being clobbered by longjmp. */
3151 int rv;
3152 volatile unsigned char *procname = XSTRING (XPROCESS (proc)->name)->data;
3153 struct coding_system *coding;
3154 struct gcpro gcpro1;
3155 int carryover = XINT (XPROCESS (proc)->encoding_carryover);
3156
3157 GCPRO1 (object);
3158
3159 #ifdef VMS
3160 struct Lisp_Process *p = XPROCESS (proc);
3161 VMS_PROC_STUFF *vs, *get_vms_process_pointer();
3162 #endif /* VMS */
3163
3164 if (! NILP (XPROCESS (proc)->raw_status_low))
3165 update_status (XPROCESS (proc));
3166 if (! EQ (XPROCESS (proc)->status, Qrun))
3167 error ("Process %s not running", procname);
3168 if (XINT (XPROCESS (proc)->outfd) < 0)
3169 error ("Output file descriptor of %s is closed", procname);
3170
3171 coding = proc_encode_coding_system[XINT (XPROCESS (proc)->outfd)];
3172 Vlast_coding_system_used = coding->symbol;
3173
3174 if (CODING_REQUIRE_ENCODING (coding))
3175 {
3176 int require = encoding_buffer_size (coding, len);
3177 int offset, dummy;
3178 unsigned char *temp_buf = NULL;
3179
3180 /* Remember the offset of data because a string or a buffer may
3181 be relocated. Setting OFFSET to -1 means we don't have to
3182 care relocation. */
3183 offset = (BUFFERP (object)
3184 ? BUF_PTR_BYTE_POS (XBUFFER (object), buf)
3185 : (STRINGP (object)
3186 ? offset = buf - XSTRING (object)->data
3187 : -1));
3188
3189 if (carryover > 0)
3190 {
3191 temp_buf = (unsigned char *) xmalloc (len + carryover);
3192
3193 if (offset >= 0)
3194 {
3195 if (BUFFERP (object))
3196 buf = BUF_BYTE_ADDRESS (XBUFFER (object), offset);
3197 else if (STRINGP (object))
3198 buf = offset + XSTRING (object)->data;
3199 /* Now we don't have to care relocation. */
3200 offset = -1;
3201 }
3202 bcopy ((XSTRING (XPROCESS (proc)->encoding_buf)->data
3203 + STRING_BYTES (XSTRING (XPROCESS (proc)->encoding_buf))
3204 - carryover),
3205 temp_buf,
3206 carryover);
3207 bcopy (buf, temp_buf + carryover, len);
3208 buf = temp_buf;
3209 }
3210
3211 if (STRING_BYTES (XSTRING (XPROCESS (proc)->encoding_buf)) < require)
3212 {
3213 XPROCESS (proc)->encoding_buf = make_uninit_string (require);
3214
3215 if (offset >= 0)
3216 {
3217 if (BUFFERP (object))
3218 buf = BUF_BYTE_ADDRESS (XBUFFER (object), offset);
3219 else if (STRINGP (object))
3220 buf = offset + XSTRING (object)->data;
3221 }
3222 }
3223 object = XPROCESS (proc)->encoding_buf;
3224 encode_coding (coding, buf, XSTRING (object)->data,
3225 len, STRING_BYTES (XSTRING (object)));
3226 len = coding->produced;
3227 buf = XSTRING (object)->data;
3228 if (temp_buf)
3229 xfree (temp_buf);
3230 }
3231
3232 #ifdef VMS
3233 vs = get_vms_process_pointer (p->pid);
3234 if (vs == 0)
3235 error ("Could not find this process: %x", p->pid);
3236 else if (write_to_vms_process (vs, buf, len))
3237 ;
3238 #else
3239
3240 if (pty_max_bytes == 0)
3241 {
3242 #if defined (HAVE_FPATHCONF) && defined (_PC_MAX_CANON)
3243 pty_max_bytes = fpathconf (XFASTINT (XPROCESS (proc)->outfd),
3244 _PC_MAX_CANON);
3245 if (pty_max_bytes < 0)
3246 pty_max_bytes = 250;
3247 #else
3248 pty_max_bytes = 250;
3249 #endif
3250 /* Deduct one, to leave space for the eof. */
3251 pty_max_bytes--;
3252 }
3253
3254 if (!setjmp (send_process_frame))
3255 while (len > 0)
3256 {
3257 int this = len;
3258 SIGTYPE (*old_sigpipe)();
3259 int flush_pty = 0;
3260
3261 /* Decide how much data we can send in one batch.
3262 Long lines need to be split into multiple batches. */
3263 if (!NILP (XPROCESS (proc)->pty_flag))
3264 {
3265 /* Starting this at zero is always correct when not the first iteration
3266 because the previous iteration ended by sending C-d.
3267 It may not be correct for the first iteration
3268 if a partial line was sent in a separate send_process call.
3269 If that proves worth handling, we need to save linepos
3270 in the process object. */
3271 int linepos = 0;
3272 unsigned char *ptr = buf;
3273 unsigned char *end = buf + len;
3274
3275 /* Scan through this text for a line that is too long. */
3276 while (ptr != end && linepos < pty_max_bytes)
3277 {
3278 if (*ptr == '\n')
3279 linepos = 0;
3280 else
3281 linepos++;
3282 ptr++;
3283 }
3284 /* If we found one, break the line there
3285 and put in a C-d to force the buffer through. */
3286 this = ptr - buf;
3287 }
3288
3289 /* Send this batch, using one or more write calls. */
3290 while (this > 0)
3291 {
3292 old_sigpipe = (SIGTYPE (*) ()) signal (SIGPIPE, send_process_trap);
3293 rv = write (XINT (XPROCESS (proc)->outfd), buf, this);
3294 signal (SIGPIPE, old_sigpipe);
3295
3296 if (rv < 0)
3297 {
3298 if (0
3299 #ifdef EWOULDBLOCK
3300 || errno == EWOULDBLOCK
3301 #endif
3302 #ifdef EAGAIN
3303 || errno == EAGAIN
3304 #endif
3305 )
3306 /* Buffer is full. Wait, accepting input;
3307 that may allow the program
3308 to finish doing output and read more. */
3309 {
3310 Lisp_Object zero;
3311 int offset;
3312
3313 /* Running filters might relocate buffers or strings.
3314 Arrange to relocate BUF. */
3315 if (BUFFERP (object))
3316 offset = BUF_PTR_BYTE_POS (XBUFFER (object), buf);
3317 else if (STRINGP (object))
3318 offset = buf - XSTRING (object)->data;
3319
3320 XSETFASTINT (zero, 0);
3321 #ifdef EMACS_HAS_USECS
3322 wait_reading_process_input (0, 20000, zero, 0);
3323 #else
3324 wait_reading_process_input (1, 0, zero, 0);
3325 #endif
3326
3327 if (BUFFERP (object))
3328 buf = BUF_BYTE_ADDRESS (XBUFFER (object), offset);
3329 else if (STRINGP (object))
3330 buf = offset + XSTRING (object)->data;
3331
3332 rv = 0;
3333 }
3334 else
3335 /* This is a real error. */
3336 report_file_error ("writing to process", Fcons (proc, Qnil));
3337 }
3338 buf += rv;
3339 len -= rv;
3340 this -= rv;
3341 }
3342
3343 /* If we sent just part of the string, put in an EOF
3344 to force it through, before we send the rest. */
3345 if (len > 0)
3346 Fprocess_send_eof (proc);
3347 }
3348 #endif
3349 else
3350 {
3351 XPROCESS (proc)->raw_status_low = Qnil;
3352 XPROCESS (proc)->raw_status_high = Qnil;
3353 XPROCESS (proc)->status = Fcons (Qexit, Fcons (make_number (256), Qnil));
3354 XSETINT (XPROCESS (proc)->tick, ++process_tick);
3355 deactivate_process (proc);
3356 #ifdef VMS
3357 error ("Error writing to process %s; closed it", procname);
3358 #else
3359 error ("SIGPIPE raised on process %s; closed it", procname);
3360 #endif
3361 }
3362
3363 UNGCPRO;
3364 }
3365
3366 DEFUN ("process-send-region", Fprocess_send_region, Sprocess_send_region,
3367 3, 3, 0,
3368 "Send current contents of region as input to PROCESS.\n\
3369 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
3370 nil, indicating the current buffer's process.\n\
3371 Called from program, takes three arguments, PROCESS, START and END.\n\
3372 If the region is more than 500 characters long,\n\
3373 it is sent in several bunches. This may happen even for shorter regions.\n\
3374 Output from processes can arrive in between bunches.")
3375 (process, start, end)
3376 Lisp_Object process, start, end;
3377 {
3378 Lisp_Object proc;
3379 int start1, end1;
3380
3381 proc = get_process (process);
3382 validate_region (&start, &end);
3383
3384 if (XINT (start) < GPT && XINT (end) > GPT)
3385 move_gap (XINT (start));
3386
3387 start1 = CHAR_TO_BYTE (XINT (start));
3388 end1 = CHAR_TO_BYTE (XINT (end));
3389 send_process (proc, BYTE_POS_ADDR (start1), end1 - start1,
3390 Fcurrent_buffer ());
3391
3392 return Qnil;
3393 }
3394
3395 DEFUN ("process-send-string", Fprocess_send_string, Sprocess_send_string,
3396 2, 2, 0,
3397 "Send PROCESS the contents of STRING as input.\n\
3398 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
3399 nil, indicating the current buffer's process.\n\
3400 If STRING is more than 500 characters long,\n\
3401 it is sent in several bunches. This may happen even for shorter strings.\n\
3402 Output from processes can arrive in between bunches.")
3403 (process, string)
3404 Lisp_Object process, string;
3405 {
3406 Lisp_Object proc;
3407 CHECK_STRING (string, 1);
3408 proc = get_process (process);
3409 send_process (proc, XSTRING (string)->data,
3410 STRING_BYTES (XSTRING (string)), string);
3411 return Qnil;
3412 }
3413 \f
3414 /* send a signal number SIGNO to PROCESS.
3415 CURRENT_GROUP means send to the process group that currently owns
3416 the terminal being used to communicate with PROCESS.
3417 This is used for various commands in shell mode.
3418 If NOMSG is zero, insert signal-announcements into process's buffers
3419 right away.
3420
3421 If we can, we try to signal PROCESS by sending control characters
3422 down the pty. This allows us to signal inferiors who have changed
3423 their uid, for which killpg would return an EPERM error. */
3424
3425 static void
3426 process_send_signal (process, signo, current_group, nomsg)
3427 Lisp_Object process;
3428 int signo;
3429 Lisp_Object current_group;
3430 int nomsg;
3431 {
3432 Lisp_Object proc;
3433 register struct Lisp_Process *p;
3434 int gid;
3435 int no_pgrp = 0;
3436
3437 proc = get_process (process);
3438 p = XPROCESS (proc);
3439
3440 if (!EQ (p->childp, Qt))
3441 error ("Process %s is not a subprocess",
3442 XSTRING (p->name)->data);
3443 if (XINT (p->infd) < 0)
3444 error ("Process %s is not active",
3445 XSTRING (p->name)->data);
3446
3447 if (NILP (p->pty_flag))
3448 current_group = Qnil;
3449
3450 /* If we are using pgrps, get a pgrp number and make it negative. */
3451 if (!NILP (current_group))
3452 {
3453 #ifdef SIGNALS_VIA_CHARACTERS
3454 /* If possible, send signals to the entire pgrp
3455 by sending an input character to it. */
3456
3457 /* TERMIOS is the latest and bestest, and seems most likely to
3458 work. If the system has it, use it. */
3459 #ifdef HAVE_TERMIOS
3460 struct termios t;
3461
3462 switch (signo)
3463 {
3464 case SIGINT:
3465 tcgetattr (XINT (p->infd), &t);
3466 send_process (proc, &t.c_cc[VINTR], 1, Qnil);
3467 return;
3468
3469 case SIGQUIT:
3470 tcgetattr (XINT (p->infd), &t);
3471 send_process (proc, &t.c_cc[VQUIT], 1, Qnil);
3472 return;
3473
3474 case SIGTSTP:
3475 tcgetattr (XINT (p->infd), &t);
3476 #if defined (VSWTCH) && !defined (PREFER_VSUSP)
3477 send_process (proc, &t.c_cc[VSWTCH], 1, Qnil);
3478 #else
3479 send_process (proc, &t.c_cc[VSUSP], 1, Qnil);
3480 #endif
3481 return;
3482 }
3483
3484 #else /* ! HAVE_TERMIOS */
3485
3486 /* On Berkeley descendants, the following IOCTL's retrieve the
3487 current control characters. */
3488 #if defined (TIOCGLTC) && defined (TIOCGETC)
3489
3490 struct tchars c;
3491 struct ltchars lc;
3492
3493 switch (signo)
3494 {
3495 case SIGINT:
3496 ioctl (XINT (p->infd), TIOCGETC, &c);
3497 send_process (proc, &c.t_intrc, 1, Qnil);
3498 return;
3499 case SIGQUIT:
3500 ioctl (XINT (p->infd), TIOCGETC, &c);
3501 send_process (proc, &c.t_quitc, 1, Qnil);
3502 return;
3503 #ifdef SIGTSTP
3504 case SIGTSTP:
3505 ioctl (XINT (p->infd), TIOCGLTC, &lc);
3506 send_process (proc, &lc.t_suspc, 1, Qnil);
3507 return;
3508 #endif /* ! defined (SIGTSTP) */
3509 }
3510
3511 #else /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
3512
3513 /* On SYSV descendants, the TCGETA ioctl retrieves the current control
3514 characters. */
3515 #ifdef TCGETA
3516 struct termio t;
3517 switch (signo)
3518 {
3519 case SIGINT:
3520 ioctl (XINT (p->infd), TCGETA, &t);
3521 send_process (proc, &t.c_cc[VINTR], 1, Qnil);
3522 return;
3523 case SIGQUIT:
3524 ioctl (XINT (p->infd), TCGETA, &t);
3525 send_process (proc, &t.c_cc[VQUIT], 1, Qnil);
3526 return;
3527 #ifdef SIGTSTP
3528 case SIGTSTP:
3529 ioctl (XINT (p->infd), TCGETA, &t);
3530 send_process (proc, &t.c_cc[VSWTCH], 1, Qnil);
3531 return;
3532 #endif /* ! defined (SIGTSTP) */
3533 }
3534 #else /* ! defined (TCGETA) */
3535 Your configuration files are messed up.
3536 /* If your system configuration files define SIGNALS_VIA_CHARACTERS,
3537 you'd better be using one of the alternatives above! */
3538 #endif /* ! defined (TCGETA) */
3539 #endif /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
3540 #endif /* ! defined HAVE_TERMIOS */
3541 #endif /* ! defined (SIGNALS_VIA_CHARACTERS) */
3542
3543 #ifdef TIOCGPGRP
3544 /* Get the pgrp using the tty itself, if we have that.
3545 Otherwise, use the pty to get the pgrp.
3546 On pfa systems, saka@pfu.fujitsu.co.JP writes:
3547 "TIOCGPGRP symbol defined in sys/ioctl.h at E50.
3548 But, TIOCGPGRP does not work on E50 ;-P works fine on E60"
3549 His patch indicates that if TIOCGPGRP returns an error, then
3550 we should just assume that p->pid is also the process group id. */
3551 {
3552 int err;
3553
3554 if (!NILP (p->subtty))
3555 err = ioctl (XFASTINT (p->subtty), TIOCGPGRP, &gid);
3556 else
3557 err = ioctl (XINT (p->infd), TIOCGPGRP, &gid);
3558
3559 #ifdef pfa
3560 if (err == -1)
3561 gid = - XFASTINT (p->pid);
3562 #endif /* ! defined (pfa) */
3563 }
3564 if (gid == -1)
3565 no_pgrp = 1;
3566 else
3567 gid = - gid;
3568 #else /* ! defined (TIOCGPGRP ) */
3569 /* Can't select pgrps on this system, so we know that
3570 the child itself heads the pgrp. */
3571 gid = - XFASTINT (p->pid);
3572 #endif /* ! defined (TIOCGPGRP ) */
3573 }
3574 else
3575 gid = - XFASTINT (p->pid);
3576
3577 switch (signo)
3578 {
3579 #ifdef SIGCONT
3580 case SIGCONT:
3581 p->raw_status_low = Qnil;
3582 p->raw_status_high = Qnil;
3583 p->status = Qrun;
3584 XSETINT (p->tick, ++process_tick);
3585 if (!nomsg)
3586 status_notify ();
3587 break;
3588 #endif /* ! defined (SIGCONT) */
3589 case SIGINT:
3590 #ifdef VMS
3591 send_process (proc, "\003", 1, Qnil); /* ^C */
3592 goto whoosh;
3593 #endif
3594 case SIGQUIT:
3595 #ifdef VMS
3596 send_process (proc, "\031", 1, Qnil); /* ^Y */
3597 goto whoosh;
3598 #endif
3599 case SIGKILL:
3600 #ifdef VMS
3601 sys$forcex (&(XFASTINT (p->pid)), 0, 1);
3602 whoosh:
3603 #endif
3604 flush_pending_output (XINT (p->infd));
3605 break;
3606 }
3607
3608 /* If we don't have process groups, send the signal to the immediate
3609 subprocess. That isn't really right, but it's better than any
3610 obvious alternative. */
3611 if (no_pgrp)
3612 {
3613 kill (XFASTINT (p->pid), signo);
3614 return;
3615 }
3616
3617 /* gid may be a pid, or minus a pgrp's number */
3618 #ifdef TIOCSIGSEND
3619 if (!NILP (current_group))
3620 ioctl (XINT (p->infd), TIOCSIGSEND, signo);
3621 else
3622 {
3623 gid = - XFASTINT (p->pid);
3624 kill (gid, signo);
3625 }
3626 #else /* ! defined (TIOCSIGSEND) */
3627 EMACS_KILLPG (-gid, signo);
3628 #endif /* ! defined (TIOCSIGSEND) */
3629 }
3630
3631 DEFUN ("interrupt-process", Finterrupt_process, Sinterrupt_process, 0, 2, 0,
3632 "Interrupt process PROCESS. May be process or name of one.\n\
3633 PROCESS may be a process, a buffer, or the name of a process or buffer.\n\
3634 nil or no arg means current buffer's process.\n\
3635 Second arg CURRENT-GROUP non-nil means send signal to\n\
3636 the current process-group of the process's controlling terminal\n\
3637 rather than to the process's own process group.\n\
3638 If the process is a shell, this means interrupt current subjob\n\
3639 rather than the shell.")
3640 (process, current_group)
3641 Lisp_Object process, current_group;
3642 {
3643 process_send_signal (process, SIGINT, current_group, 0);
3644 return process;
3645 }
3646
3647 DEFUN ("kill-process", Fkill_process, Skill_process, 0, 2, 0,
3648 "Kill process PROCESS. May be process or name of one.\n\
3649 See function `interrupt-process' for more details on usage.")
3650 (process, current_group)
3651 Lisp_Object process, current_group;
3652 {
3653 process_send_signal (process, SIGKILL, current_group, 0);
3654 return process;
3655 }
3656
3657 DEFUN ("quit-process", Fquit_process, Squit_process, 0, 2, 0,
3658 "Send QUIT signal to process PROCESS. May be process or name of one.\n\
3659 See function `interrupt-process' for more details on usage.")
3660 (process, current_group)
3661 Lisp_Object process, current_group;
3662 {
3663 process_send_signal (process, SIGQUIT, current_group, 0);
3664 return process;
3665 }
3666
3667 DEFUN ("stop-process", Fstop_process, Sstop_process, 0, 2, 0,
3668 "Stop process PROCESS. May be process or name of one.\n\
3669 See function `interrupt-process' for more details on usage.")
3670 (process, current_group)
3671 Lisp_Object process, current_group;
3672 {
3673 #ifndef SIGTSTP
3674 error ("no SIGTSTP support");
3675 #else
3676 process_send_signal (process, SIGTSTP, current_group, 0);
3677 #endif
3678 return process;
3679 }
3680
3681 DEFUN ("continue-process", Fcontinue_process, Scontinue_process, 0, 2, 0,
3682 "Continue process PROCESS. May be process or name of one.\n\
3683 See function `interrupt-process' for more details on usage.")
3684 (process, current_group)
3685 Lisp_Object process, current_group;
3686 {
3687 #ifdef SIGCONT
3688 process_send_signal (process, SIGCONT, current_group, 0);
3689 #else
3690 error ("no SIGCONT support");
3691 #endif
3692 return process;
3693 }
3694
3695 DEFUN ("signal-process", Fsignal_process, Ssignal_process,
3696 2, 2, "nProcess number: \nnSignal code: ",
3697 "Send the process with process id PID the signal with code SIGCODE.\n\
3698 PID must be an integer. The process need not be a child of this Emacs.\n\
3699 SIGCODE may be an integer, or a symbol whose name is a signal name.")
3700 (pid, sigcode)
3701 Lisp_Object pid, sigcode;
3702 {
3703 CHECK_NUMBER (pid, 0);
3704
3705 #define handle_signal(NAME, VALUE) \
3706 else if (!strcmp (name, NAME)) \
3707 XSETINT (sigcode, VALUE)
3708
3709 if (INTEGERP (sigcode))
3710 ;
3711 else
3712 {
3713 unsigned char *name;
3714
3715 CHECK_SYMBOL (sigcode, 1);
3716 name = XSYMBOL (sigcode)->name->data;
3717
3718 if (0)
3719 ;
3720 #ifdef SIGHUP
3721 handle_signal ("SIGHUP", SIGHUP);
3722 #endif
3723 #ifdef SIGINT
3724 handle_signal ("SIGINT", SIGINT);
3725 #endif
3726 #ifdef SIGQUIT
3727 handle_signal ("SIGQUIT", SIGQUIT);
3728 #endif
3729 #ifdef SIGILL
3730 handle_signal ("SIGILL", SIGILL);
3731 #endif
3732 #ifdef SIGABRT
3733 handle_signal ("SIGABRT", SIGABRT);
3734 #endif
3735 #ifdef SIGEMT
3736 handle_signal ("SIGEMT", SIGEMT);
3737 #endif
3738 #ifdef SIGKILL
3739 handle_signal ("SIGKILL", SIGKILL);
3740 #endif
3741 #ifdef SIGFPE
3742 handle_signal ("SIGFPE", SIGFPE);
3743 #endif
3744 #ifdef SIGBUS
3745 handle_signal ("SIGBUS", SIGBUS);
3746 #endif
3747 #ifdef SIGSEGV
3748 handle_signal ("SIGSEGV", SIGSEGV);
3749 #endif
3750 #ifdef SIGSYS
3751 handle_signal ("SIGSYS", SIGSYS);
3752 #endif
3753 #ifdef SIGPIPE
3754 handle_signal ("SIGPIPE", SIGPIPE);
3755 #endif
3756 #ifdef SIGALRM
3757 handle_signal ("SIGALRM", SIGALRM);
3758 #endif
3759 #ifdef SIGTERM
3760 handle_signal ("SIGTERM", SIGTERM);
3761 #endif
3762 #ifdef SIGURG
3763 handle_signal ("SIGURG", SIGURG);
3764 #endif
3765 #ifdef SIGSTOP
3766 handle_signal ("SIGSTOP", SIGSTOP);
3767 #endif
3768 #ifdef SIGTSTP
3769 handle_signal ("SIGTSTP", SIGTSTP);
3770 #endif
3771 #ifdef SIGCONT
3772 handle_signal ("SIGCONT", SIGCONT);
3773 #endif
3774 #ifdef SIGCHLD
3775 handle_signal ("SIGCHLD", SIGCHLD);
3776 #endif
3777 #ifdef SIGTTIN
3778 handle_signal ("SIGTTIN", SIGTTIN);
3779 #endif
3780 #ifdef SIGTTOU
3781 handle_signal ("SIGTTOU", SIGTTOU);
3782 #endif
3783 #ifdef SIGIO
3784 handle_signal ("SIGIO", SIGIO);
3785 #endif
3786 #ifdef SIGXCPU
3787 handle_signal ("SIGXCPU", SIGXCPU);
3788 #endif
3789 #ifdef SIGXFSZ
3790 handle_signal ("SIGXFSZ", SIGXFSZ);
3791 #endif
3792 #ifdef SIGVTALRM
3793 handle_signal ("SIGVTALRM", SIGVTALRM);
3794 #endif
3795 #ifdef SIGPROF
3796 handle_signal ("SIGPROF", SIGPROF);
3797 #endif
3798 #ifdef SIGWINCH
3799 handle_signal ("SIGWINCH", SIGWINCH);
3800 #endif
3801 #ifdef SIGINFO
3802 handle_signal ("SIGINFO", SIGINFO);
3803 #endif
3804 #ifdef SIGUSR1
3805 handle_signal ("SIGUSR1", SIGUSR1);
3806 #endif
3807 #ifdef SIGUSR2
3808 handle_signal ("SIGUSR2", SIGUSR2);
3809 #endif
3810 else
3811 error ("Undefined signal name %s", name);
3812 }
3813
3814 #undef handle_signal
3815
3816 return make_number (kill (XINT (pid), XINT (sigcode)));
3817 }
3818
3819 DEFUN ("process-send-eof", Fprocess_send_eof, Sprocess_send_eof, 0, 1, 0,
3820 "Make PROCESS see end-of-file in its input.\n\
3821 Eof comes after any text already sent to it.\n\
3822 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
3823 nil, indicating the current buffer's process.\n\
3824 If PROCESS is a network connection, or is a process communicating\n\
3825 through a pipe (as opposed to a pty), then you cannot send any more\n\
3826 text to PROCESS after you call this function.")
3827 (process)
3828 Lisp_Object process;
3829 {
3830 Lisp_Object proc;
3831
3832 proc = get_process (process);
3833
3834 /* Make sure the process is really alive. */
3835 if (! NILP (XPROCESS (proc)->raw_status_low))
3836 update_status (XPROCESS (proc));
3837 if (! EQ (XPROCESS (proc)->status, Qrun))
3838 error ("Process %s not running", XSTRING (XPROCESS (proc)->name)->data);
3839
3840 #ifdef VMS
3841 send_process (proc, "\032", 1, Qnil); /* ^z */
3842 #else
3843 if (!NILP (XPROCESS (proc)->pty_flag))
3844 send_process (proc, "\004", 1, Qnil);
3845 else
3846 {
3847 #ifdef HAVE_SHUTDOWN
3848 /* If this is a network connection, or socketpair is used
3849 for communication with the subprocess, call shutdown to cause EOF.
3850 (In some old system, shutdown to socketpair doesn't work.
3851 Then we just can't win.) */
3852 if (NILP (XPROCESS (proc)->pid)
3853 || XINT (XPROCESS (proc)->outfd) == XINT (XPROCESS (proc)->infd))
3854 shutdown (XINT (XPROCESS (proc)->outfd), 1);
3855 /* In case of socketpair, outfd == infd, so don't close it. */
3856 if (XINT (XPROCESS (proc)->outfd) != XINT (XPROCESS (proc)->infd))
3857 close (XINT (XPROCESS (proc)->outfd));
3858 #else /* not HAVE_SHUTDOWN */
3859 close (XINT (XPROCESS (proc)->outfd));
3860 #endif /* not HAVE_SHUTDOWN */
3861 XSETINT (XPROCESS (proc)->outfd, open (NULL_DEVICE, O_WRONLY));
3862 }
3863 #endif /* VMS */
3864 return process;
3865 }
3866
3867 /* Kill all processes associated with `buffer'.
3868 If `buffer' is nil, kill all processes */
3869
3870 void
3871 kill_buffer_processes (buffer)
3872 Lisp_Object buffer;
3873 {
3874 Lisp_Object tail, proc;
3875
3876 for (tail = Vprocess_alist; GC_CONSP (tail); tail = XCONS (tail)->cdr)
3877 {
3878 proc = XCONS (XCONS (tail)->car)->cdr;
3879 if (GC_PROCESSP (proc)
3880 && (NILP (buffer) || EQ (XPROCESS (proc)->buffer, buffer)))
3881 {
3882 if (NETCONN_P (proc))
3883 Fdelete_process (proc);
3884 else if (XINT (XPROCESS (proc)->infd) >= 0)
3885 process_send_signal (proc, SIGHUP, Qnil, 1);
3886 }
3887 }
3888 }
3889 \f
3890 /* On receipt of a signal that a child status has changed,
3891 loop asking about children with changed statuses until
3892 the system says there are no more.
3893 All we do is change the status;
3894 we do not run sentinels or print notifications.
3895 That is saved for the next time keyboard input is done,
3896 in order to avoid timing errors. */
3897
3898 /** WARNING: this can be called during garbage collection.
3899 Therefore, it must not be fooled by the presence of mark bits in
3900 Lisp objects. */
3901
3902 /** USG WARNING: Although it is not obvious from the documentation
3903 in signal(2), on a USG system the SIGCLD handler MUST NOT call
3904 signal() before executing at least one wait(), otherwise the handler
3905 will be called again, resulting in an infinite loop. The relevant
3906 portion of the documentation reads "SIGCLD signals will be queued
3907 and the signal-catching function will be continually reentered until
3908 the queue is empty". Invoking signal() causes the kernel to reexamine
3909 the SIGCLD queue. Fred Fish, UniSoft Systems Inc. */
3910
3911 SIGTYPE
3912 sigchld_handler (signo)
3913 int signo;
3914 {
3915 int old_errno = errno;
3916 Lisp_Object proc;
3917 register struct Lisp_Process *p;
3918 extern EMACS_TIME *input_available_clear_time;
3919
3920 #ifdef BSD4_1
3921 extern int sigheld;
3922 sigheld |= sigbit (SIGCHLD);
3923 #endif
3924
3925 while (1)
3926 {
3927 register int pid;
3928 WAITTYPE w;
3929 Lisp_Object tail;
3930
3931 #ifdef WNOHANG
3932 #ifndef WUNTRACED
3933 #define WUNTRACED 0
3934 #endif /* no WUNTRACED */
3935 /* Keep trying to get a status until we get a definitive result. */
3936 do
3937 {
3938 errno = 0;
3939 pid = wait3 (&w, WNOHANG | WUNTRACED, 0);
3940 }
3941 while (pid <= 0 && errno == EINTR);
3942
3943 if (pid <= 0)
3944 {
3945 /* A real failure. We have done all our job, so return. */
3946
3947 /* USG systems forget handlers when they are used;
3948 must reestablish each time */
3949 #if defined (USG) && !defined (POSIX_SIGNALS)
3950 signal (signo, sigchld_handler); /* WARNING - must come after wait3() */
3951 #endif
3952 #ifdef BSD4_1
3953 sigheld &= ~sigbit (SIGCHLD);
3954 sigrelse (SIGCHLD);
3955 #endif
3956 errno = old_errno;
3957 return;
3958 }
3959 #else
3960 pid = wait (&w);
3961 #endif /* no WNOHANG */
3962
3963 /* Find the process that signaled us, and record its status. */
3964
3965 p = 0;
3966 for (tail = Vprocess_alist; CONSP (tail); tail = XCONS (tail)->cdr)
3967 {
3968 proc = XCONS (XCONS (tail)->car)->cdr;
3969 p = XPROCESS (proc);
3970 if (EQ (p->childp, Qt) && XFASTINT (p->pid) == pid)
3971 break;
3972 p = 0;
3973 }
3974
3975 /* Look for an asynchronous process whose pid hasn't been filled
3976 in yet. */
3977 if (p == 0)
3978 for (tail = Vprocess_alist; CONSP (tail); tail = XCONS (tail)->cdr)
3979 {
3980 proc = XCONS (XCONS (tail)->car)->cdr;
3981 p = XPROCESS (proc);
3982 if (INTEGERP (p->pid) && XINT (p->pid) == -1)
3983 break;
3984 p = 0;
3985 }
3986
3987 /* Change the status of the process that was found. */
3988 if (p != 0)
3989 {
3990 union { int i; WAITTYPE wt; } u;
3991 int clear_desc_flag = 0;
3992
3993 XSETINT (p->tick, ++process_tick);
3994 u.wt = w;
3995 XSETINT (p->raw_status_low, u.i & 0xffff);
3996 XSETINT (p->raw_status_high, u.i >> 16);
3997
3998 /* If process has terminated, stop waiting for its output. */
3999 if ((WIFSIGNALED (w) || WIFEXITED (w))
4000 && XINT (p->infd) >= 0)
4001 clear_desc_flag = 1;
4002
4003 /* We use clear_desc_flag to avoid a compiler bug in Microsoft C. */
4004 if (clear_desc_flag)
4005 {
4006 FD_CLR (XINT (p->infd), &input_wait_mask);
4007 FD_CLR (XINT (p->infd), &non_keyboard_wait_mask);
4008 }
4009
4010 /* Tell wait_reading_process_input that it needs to wake up and
4011 look around. */
4012 if (input_available_clear_time)
4013 EMACS_SET_SECS_USECS (*input_available_clear_time, 0, 0);
4014 }
4015
4016 /* There was no asynchronous process found for that id. Check
4017 if we have a synchronous process. */
4018 else
4019 {
4020 synch_process_alive = 0;
4021
4022 /* Report the status of the synchronous process. */
4023 if (WIFEXITED (w))
4024 synch_process_retcode = WRETCODE (w);
4025 else if (WIFSIGNALED (w))
4026 {
4027 int code = WTERMSIG (w);
4028 char *signame = 0;
4029
4030 if (code < NSIG)
4031 {
4032 #ifndef VMS
4033 /* Suppress warning if the table has const char *. */
4034 signame = (char *) sys_siglist[code];
4035 #else
4036 signame = sys_errlist[code];
4037 #endif
4038 }
4039 if (signame == 0)
4040 signame = "unknown";
4041
4042 synch_process_death = signame;
4043 }
4044
4045 /* Tell wait_reading_process_input that it needs to wake up and
4046 look around. */
4047 if (input_available_clear_time)
4048 EMACS_SET_SECS_USECS (*input_available_clear_time, 0, 0);
4049 }
4050
4051 /* On some systems, we must return right away.
4052 If any more processes want to signal us, we will
4053 get another signal.
4054 Otherwise (on systems that have WNOHANG), loop around
4055 to use up all the processes that have something to tell us. */
4056 #if defined (USG) && ! (defined (HPUX) && defined (WNOHANG)) || defined (WINDOWSNT)
4057 #if defined (USG) && ! defined (POSIX_SIGNALS)
4058 signal (signo, sigchld_handler);
4059 #endif
4060 errno = old_errno;
4061 return;
4062 #endif /* USG, but not HPUX with WNOHANG */
4063 }
4064 }
4065 \f
4066
4067 static Lisp_Object
4068 exec_sentinel_unwind (data)
4069 Lisp_Object data;
4070 {
4071 XPROCESS (XCONS (data)->car)->sentinel = XCONS (data)->cdr;
4072 return Qnil;
4073 }
4074
4075 static Lisp_Object
4076 exec_sentinel_error_handler (error)
4077 Lisp_Object error;
4078 {
4079 cmd_error_internal (error, "error in process sentinel: ");
4080 Vinhibit_quit = Qt;
4081 update_echo_area ();
4082 Fsleep_for (make_number (2), Qnil);
4083 }
4084
4085 static void
4086 exec_sentinel (proc, reason)
4087 Lisp_Object proc, reason;
4088 {
4089 Lisp_Object sentinel, obuffer, odeactivate, okeymap;
4090 register struct Lisp_Process *p = XPROCESS (proc);
4091 int count = specpdl_ptr - specpdl;
4092 int outer_running_asynch_code = running_asynch_code;
4093
4094 /* No need to gcpro these, because all we do with them later
4095 is test them for EQness, and none of them should be a string. */
4096 odeactivate = Vdeactivate_mark;
4097 XSETBUFFER (obuffer, current_buffer);
4098 okeymap = current_buffer->keymap;
4099
4100 sentinel = p->sentinel;
4101 if (NILP (sentinel))
4102 return;
4103
4104 /* Zilch the sentinel while it's running, to avoid recursive invocations;
4105 assure that it gets restored no matter how the sentinel exits. */
4106 p->sentinel = Qnil;
4107 record_unwind_protect (exec_sentinel_unwind, Fcons (proc, sentinel));
4108 /* Inhibit quit so that random quits don't screw up a running filter. */
4109 specbind (Qinhibit_quit, Qt);
4110 specbind (Qlast_nonmenu_event, Qt);
4111
4112 /* In case we get recursively called,
4113 and we already saved the match data nonrecursively,
4114 save the same match data in safely recursive fashion. */
4115 if (outer_running_asynch_code)
4116 {
4117 Lisp_Object tem;
4118 tem = Fmatch_data (Qnil, Qnil);
4119 restore_match_data ();
4120 record_unwind_protect (Fset_match_data, Fmatch_data (Qnil, Qnil));
4121 Fset_match_data (tem);
4122 }
4123
4124 /* For speed, if a search happens within this code,
4125 save the match data in a special nonrecursive fashion. */
4126 running_asynch_code = 1;
4127
4128 internal_condition_case_1 (read_process_output_call,
4129 Fcons (sentinel,
4130 Fcons (proc, Fcons (reason, Qnil))),
4131 !NILP (Vdebug_on_error) ? Qnil : Qerror,
4132 exec_sentinel_error_handler);
4133
4134 /* If we saved the match data nonrecursively, restore it now. */
4135 restore_match_data ();
4136 running_asynch_code = outer_running_asynch_code;
4137
4138 Vdeactivate_mark = odeactivate;
4139 #if 0
4140 if (! EQ (Fcurrent_buffer (), obuffer)
4141 || ! EQ (current_buffer->keymap, okeymap))
4142 #endif
4143 /* But do it only if the caller is actually going to read events.
4144 Otherwise there's no need to make him wake up, and it could
4145 cause trouble (for example it would make Fsit_for return). */
4146 if (waiting_for_user_input_p == -1)
4147 record_asynch_buffer_change ();
4148
4149 unbind_to (count, Qnil);
4150 }
4151
4152 /* Report all recent events of a change in process status
4153 (either run the sentinel or output a message).
4154 This is done while Emacs is waiting for keyboard input. */
4155
4156 void
4157 status_notify ()
4158 {
4159 register Lisp_Object proc, buffer;
4160 Lisp_Object tail, msg;
4161 struct gcpro gcpro1, gcpro2;
4162
4163 tail = Qnil;
4164 msg = Qnil;
4165 /* We need to gcpro tail; if read_process_output calls a filter
4166 which deletes a process and removes the cons to which tail points
4167 from Vprocess_alist, and then causes a GC, tail is an unprotected
4168 reference. */
4169 GCPRO2 (tail, msg);
4170
4171 /* Set this now, so that if new processes are created by sentinels
4172 that we run, we get called again to handle their status changes. */
4173 update_tick = process_tick;
4174
4175 for (tail = Vprocess_alist; !NILP (tail); tail = Fcdr (tail))
4176 {
4177 Lisp_Object symbol;
4178 register struct Lisp_Process *p;
4179
4180 proc = Fcdr (Fcar (tail));
4181 p = XPROCESS (proc);
4182
4183 if (XINT (p->tick) != XINT (p->update_tick))
4184 {
4185 XSETINT (p->update_tick, XINT (p->tick));
4186
4187 /* If process is still active, read any output that remains. */
4188 while (! EQ (p->filter, Qt)
4189 && XINT (p->infd) >= 0
4190 && read_process_output (proc, XINT (p->infd)) > 0);
4191
4192 buffer = p->buffer;
4193
4194 /* Get the text to use for the message. */
4195 if (!NILP (p->raw_status_low))
4196 update_status (p);
4197 msg = status_message (p->status);
4198
4199 /* If process is terminated, deactivate it or delete it. */
4200 symbol = p->status;
4201 if (CONSP (p->status))
4202 symbol = XCONS (p->status)->car;
4203
4204 if (EQ (symbol, Qsignal) || EQ (symbol, Qexit)
4205 || EQ (symbol, Qclosed))
4206 {
4207 if (delete_exited_processes)
4208 remove_process (proc);
4209 else
4210 deactivate_process (proc);
4211 }
4212
4213 /* The actions above may have further incremented p->tick.
4214 So set p->update_tick again
4215 so that an error in the sentinel will not cause
4216 this code to be run again. */
4217 XSETINT (p->update_tick, XINT (p->tick));
4218 /* Now output the message suitably. */
4219 if (!NILP (p->sentinel))
4220 exec_sentinel (proc, msg);
4221 /* Don't bother with a message in the buffer
4222 when a process becomes runnable. */
4223 else if (!EQ (symbol, Qrun) && !NILP (buffer))
4224 {
4225 Lisp_Object ro, tem;
4226 struct buffer *old = current_buffer;
4227 int opoint, opoint_byte;
4228 int before, before_byte;
4229
4230 ro = XBUFFER (buffer)->read_only;
4231
4232 /* Avoid error if buffer is deleted
4233 (probably that's why the process is dead, too) */
4234 if (NILP (XBUFFER (buffer)->name))
4235 continue;
4236 Fset_buffer (buffer);
4237
4238 opoint = PT;
4239 opoint_byte = PT_BYTE;
4240 /* Insert new output into buffer
4241 at the current end-of-output marker,
4242 thus preserving logical ordering of input and output. */
4243 if (XMARKER (p->mark)->buffer)
4244 Fgoto_char (p->mark);
4245 else
4246 SET_PT_BOTH (ZV, ZV_BYTE);
4247
4248 before = PT;
4249 before_byte = PT_BYTE;
4250
4251 tem = current_buffer->read_only;
4252 current_buffer->read_only = Qnil;
4253 insert_string ("\nProcess ");
4254 Finsert (1, &p->name);
4255 insert_string (" ");
4256 Finsert (1, &msg);
4257 current_buffer->read_only = tem;
4258 set_marker_both (p->mark, p->buffer, PT, PT_BYTE);
4259
4260 if (opoint >= before)
4261 SET_PT_BOTH (opoint + (PT - before),
4262 opoint_byte + (PT_BYTE - before_byte));
4263 else
4264 SET_PT_BOTH (opoint, opoint_byte);
4265
4266 set_buffer_internal (old);
4267 }
4268 }
4269 } /* end for */
4270
4271 update_mode_lines++; /* in case buffers use %s in mode-line-format */
4272 redisplay_preserve_echo_area ();
4273
4274 UNGCPRO;
4275 }
4276
4277 \f
4278 DEFUN ("set-process-coding-system", Fset_process_coding_system,
4279 Sset_process_coding_system, 1, 3, 0,
4280 "Set coding systems of PROCESS to DECODING (input from the process) and\n\
4281 ENCODING (output to the process).")
4282 (proc, decoding, encoding)
4283 register Lisp_Object proc, decoding, encoding;
4284 {
4285 register struct Lisp_Process *p;
4286
4287 CHECK_PROCESS (proc, 0);
4288 p = XPROCESS (proc);
4289 if (XINT (p->infd) < 0)
4290 error ("Input file descriptor of %s closed", XSTRING (p->name)->data);
4291 if (XINT (p->outfd) < 0)
4292 error ("Output file descriptor of %s closed", XSTRING (p->name)->data);
4293
4294 p->decode_coding_system = Fcheck_coding_system (decoding);
4295 p->encode_coding_system = Fcheck_coding_system (encoding);
4296 setup_coding_system (decoding,
4297 proc_decode_coding_system[XINT (p->infd)]);
4298 setup_coding_system (encoding,
4299 proc_encode_coding_system[XINT (p->outfd)]);
4300
4301 return Qnil;
4302 }
4303
4304 DEFUN ("process-coding-system",
4305 Fprocess_coding_system, Sprocess_coding_system, 1, 1, 0,
4306 "Return a cons of coding systems for decoding and encoding of PROCESS.")
4307 (proc)
4308 register Lisp_Object proc;
4309 {
4310 CHECK_PROCESS (proc, 0);
4311 return Fcons (XPROCESS (proc)->decode_coding_system,
4312 XPROCESS (proc)->encode_coding_system);
4313 }
4314 \f
4315 /* The first time this is called, assume keyboard input comes from DESC
4316 instead of from where we used to expect it.
4317 Subsequent calls mean assume input keyboard can come from DESC
4318 in addition to other places. */
4319
4320 static int add_keyboard_wait_descriptor_called_flag;
4321
4322 void
4323 add_keyboard_wait_descriptor (desc)
4324 int desc;
4325 {
4326 if (! add_keyboard_wait_descriptor_called_flag)
4327 FD_CLR (0, &input_wait_mask);
4328 add_keyboard_wait_descriptor_called_flag = 1;
4329 FD_SET (desc, &input_wait_mask);
4330 FD_SET (desc, &non_process_wait_mask);
4331 if (desc > max_keyboard_desc)
4332 max_keyboard_desc = desc;
4333 }
4334
4335 /* From now on, do not expect DESC to give keyboard input. */
4336
4337 void
4338 delete_keyboard_wait_descriptor (desc)
4339 int desc;
4340 {
4341 int fd;
4342 int lim = max_keyboard_desc;
4343
4344 FD_CLR (desc, &input_wait_mask);
4345 FD_CLR (desc, &non_process_wait_mask);
4346
4347 if (desc == max_keyboard_desc)
4348 for (fd = 0; fd < lim; fd++)
4349 if (FD_ISSET (fd, &input_wait_mask)
4350 && !FD_ISSET (fd, &non_keyboard_wait_mask))
4351 max_keyboard_desc = fd;
4352 }
4353
4354 /* Return nonzero if *MASK has a bit set
4355 that corresponds to one of the keyboard input descriptors. */
4356
4357 int
4358 keyboard_bit_set (mask)
4359 SELECT_TYPE *mask;
4360 {
4361 int fd;
4362
4363 for (fd = 0; fd <= max_keyboard_desc; fd++)
4364 if (FD_ISSET (fd, mask) && FD_ISSET (fd, &input_wait_mask)
4365 && !FD_ISSET (fd, &non_keyboard_wait_mask))
4366 return 1;
4367
4368 return 0;
4369 }
4370 \f
4371 void
4372 init_process ()
4373 {
4374 register int i;
4375
4376 #ifdef SIGCHLD
4377 #ifndef CANNOT_DUMP
4378 if (! noninteractive || initialized)
4379 #endif
4380 signal (SIGCHLD, sigchld_handler);
4381 #endif
4382
4383 FD_ZERO (&input_wait_mask);
4384 FD_ZERO (&non_keyboard_wait_mask);
4385 FD_ZERO (&non_process_wait_mask);
4386 max_process_desc = 0;
4387
4388 FD_SET (0, &input_wait_mask);
4389
4390 Vprocess_alist = Qnil;
4391 for (i = 0; i < MAXDESC; i++)
4392 {
4393 chan_process[i] = Qnil;
4394 proc_buffered_char[i] = -1;
4395 }
4396 bzero (proc_decode_coding_system, sizeof proc_decode_coding_system);
4397 bzero (proc_encode_coding_system, sizeof proc_encode_coding_system);
4398
4399 Vdefault_process_coding_system
4400 = (NILP (buffer_defaults.enable_multibyte_characters)
4401 ? Fcons (Qraw_text, Qnil)
4402 : Fcons (Qemacs_mule, Qnil));
4403 }
4404
4405 void
4406 syms_of_process ()
4407 {
4408 Qprocessp = intern ("processp");
4409 staticpro (&Qprocessp);
4410 Qrun = intern ("run");
4411 staticpro (&Qrun);
4412 Qstop = intern ("stop");
4413 staticpro (&Qstop);
4414 Qsignal = intern ("signal");
4415 staticpro (&Qsignal);
4416
4417 /* Qexit is already staticpro'd by syms_of_eval; don't staticpro it
4418 here again.
4419
4420 Qexit = intern ("exit");
4421 staticpro (&Qexit); */
4422
4423 Qopen = intern ("open");
4424 staticpro (&Qopen);
4425 Qclosed = intern ("closed");
4426 staticpro (&Qclosed);
4427
4428 Qlast_nonmenu_event = intern ("last-nonmenu-event");
4429 staticpro (&Qlast_nonmenu_event);
4430
4431 staticpro (&Vprocess_alist);
4432
4433 DEFVAR_BOOL ("delete-exited-processes", &delete_exited_processes,
4434 "*Non-nil means delete processes immediately when they exit.\n\
4435 nil means don't delete them until `list-processes' is run.");
4436
4437 delete_exited_processes = 1;
4438
4439 DEFVAR_LISP ("process-connection-type", &Vprocess_connection_type,
4440 "Control type of device used to communicate with subprocesses.\n\
4441 Values are nil to use a pipe, or t or `pty' to use a pty.\n\
4442 The value has no effect if the system has no ptys or if all ptys are busy:\n\
4443 then a pipe is used in any case.\n\
4444 The value takes effect when `start-process' is called.");
4445 Vprocess_connection_type = Qt;
4446
4447 defsubr (&Sprocessp);
4448 defsubr (&Sget_process);
4449 defsubr (&Sget_buffer_process);
4450 defsubr (&Sdelete_process);
4451 defsubr (&Sprocess_status);
4452 defsubr (&Sprocess_exit_status);
4453 defsubr (&Sprocess_id);
4454 defsubr (&Sprocess_name);
4455 defsubr (&Sprocess_tty_name);
4456 defsubr (&Sprocess_command);
4457 defsubr (&Sset_process_buffer);
4458 defsubr (&Sprocess_buffer);
4459 defsubr (&Sprocess_mark);
4460 defsubr (&Sset_process_filter);
4461 defsubr (&Sprocess_filter);
4462 defsubr (&Sset_process_sentinel);
4463 defsubr (&Sprocess_sentinel);
4464 defsubr (&Sset_process_window_size);
4465 defsubr (&Sset_process_inherit_coding_system_flag);
4466 defsubr (&Sprocess_inherit_coding_system_flag);
4467 defsubr (&Sprocess_kill_without_query);
4468 defsubr (&Sprocess_contact);
4469 defsubr (&Slist_processes);
4470 defsubr (&Sprocess_list);
4471 defsubr (&Sstart_process);
4472 #ifdef HAVE_SOCKETS
4473 defsubr (&Sopen_network_stream);
4474 #endif /* HAVE_SOCKETS */
4475 defsubr (&Saccept_process_output);
4476 defsubr (&Sprocess_send_region);
4477 defsubr (&Sprocess_send_string);
4478 defsubr (&Sinterrupt_process);
4479 defsubr (&Skill_process);
4480 defsubr (&Squit_process);
4481 defsubr (&Sstop_process);
4482 defsubr (&Scontinue_process);
4483 defsubr (&Sprocess_send_eof);
4484 defsubr (&Ssignal_process);
4485 defsubr (&Swaiting_for_user_input_p);
4486 /* defsubr (&Sprocess_connection); */
4487 defsubr (&Sset_process_coding_system);
4488 defsubr (&Sprocess_coding_system);
4489 }
4490
4491 \f
4492 #else /* not subprocesses */
4493
4494 #include <sys/types.h>
4495 #include <errno.h>
4496
4497 #include "lisp.h"
4498 #include "systime.h"
4499 #include "charset.h"
4500 #include "coding.h"
4501 #include "termopts.h"
4502 #include "sysselect.h"
4503
4504 extern int frame_garbaged;
4505
4506 extern EMACS_TIME timer_check ();
4507 extern int timers_run;
4508
4509 /* As described above, except assuming that there are no subprocesses:
4510
4511 Wait for timeout to elapse and/or keyboard input to be available.
4512
4513 time_limit is:
4514 timeout in seconds, or
4515 zero for no limit, or
4516 -1 means gobble data immediately available but don't wait for any.
4517
4518 read_kbd is a Lisp_Object:
4519 0 to ignore keyboard input, or
4520 1 to return when input is available, or
4521 -1 means caller will actually read the input, so don't throw to
4522 the quit handler.
4523 a cons cell, meaning wait until its car is non-nil
4524 (and gobble terminal input into the buffer if any arrives), or
4525 We know that read_kbd will never be a Lisp_Process, since
4526 `subprocesses' isn't defined.
4527
4528 do_display != 0 means redisplay should be done to show subprocess
4529 output that arrives.
4530
4531 Return true iff we received input from any process. */
4532
4533 int
4534 wait_reading_process_input (time_limit, microsecs, read_kbd, do_display)
4535 int time_limit, microsecs;
4536 Lisp_Object read_kbd;
4537 int do_display;
4538 {
4539 register int nfds;
4540 EMACS_TIME end_time, timeout;
4541 SELECT_TYPE waitchannels;
4542 int xerrno;
4543 Lisp_Object *wait_for_cell = 0;
4544
4545 /* If waiting for non-nil in a cell, record where. */
4546 if (CONSP (read_kbd))
4547 {
4548 wait_for_cell = &XCONS (read_kbd)->car;
4549 XSETFASTINT (read_kbd, 0);
4550 }
4551
4552 /* What does time_limit really mean? */
4553 if (time_limit || microsecs)
4554 {
4555 EMACS_GET_TIME (end_time);
4556 EMACS_SET_SECS_USECS (timeout, time_limit, microsecs);
4557 EMACS_ADD_TIME (end_time, end_time, timeout);
4558 }
4559
4560 /* Turn off periodic alarms (in case they are in use)
4561 because the select emulator uses alarms. */
4562 stop_polling ();
4563
4564 while (1)
4565 {
4566 int timeout_reduced_for_timers = 0;
4567
4568 /* If calling from keyboard input, do not quit
4569 since we want to return C-g as an input character.
4570 Otherwise, do pending quit if requested. */
4571 if (XINT (read_kbd) >= 0)
4572 QUIT;
4573
4574 /* Exit now if the cell we're waiting for became non-nil. */
4575 if (wait_for_cell && ! NILP (*wait_for_cell))
4576 break;
4577
4578 /* Compute time from now till when time limit is up */
4579 /* Exit if already run out */
4580 if (time_limit == -1)
4581 {
4582 /* -1 specified for timeout means
4583 gobble output available now
4584 but don't wait at all. */
4585
4586 EMACS_SET_SECS_USECS (timeout, 0, 0);
4587 }
4588 else if (time_limit || microsecs)
4589 {
4590 EMACS_GET_TIME (timeout);
4591 EMACS_SUB_TIME (timeout, end_time, timeout);
4592 if (EMACS_TIME_NEG_P (timeout))
4593 break;
4594 }
4595 else
4596 {
4597 EMACS_SET_SECS_USECS (timeout, 100000, 0);
4598 }
4599
4600 /* If our caller will not immediately handle keyboard events,
4601 run timer events directly.
4602 (Callers that will immediately read keyboard events
4603 call timer_delay on their own.) */
4604 if (! wait_for_cell)
4605 {
4606 EMACS_TIME timer_delay;
4607 int old_timers_run;
4608
4609 retry:
4610 old_timers_run = timers_run;
4611 timer_delay = timer_check (1);
4612 if (timers_run != old_timers_run && do_display)
4613 {
4614 redisplay_preserve_echo_area ();
4615 /* We must retry, since a timer may have requeued itself
4616 and that could alter the time delay. */
4617 goto retry;
4618 }
4619
4620 /* If there is unread keyboard input, also return. */
4621 if (XINT (read_kbd) != 0
4622 && requeued_events_pending_p ())
4623 break;
4624
4625 if (! EMACS_TIME_NEG_P (timer_delay) && time_limit != -1)
4626 {
4627 EMACS_TIME difference;
4628 EMACS_SUB_TIME (difference, timer_delay, timeout);
4629 if (EMACS_TIME_NEG_P (difference))
4630 {
4631 timeout = timer_delay;
4632 timeout_reduced_for_timers = 1;
4633 }
4634 }
4635 }
4636
4637 /* Cause C-g and alarm signals to take immediate action,
4638 and cause input available signals to zero out timeout. */
4639 if (XINT (read_kbd) < 0)
4640 set_waiting_for_input (&timeout);
4641
4642 /* Wait till there is something to do. */
4643
4644 if (! XINT (read_kbd) && wait_for_cell == 0)
4645 FD_ZERO (&waitchannels);
4646 else
4647 FD_SET (0, &waitchannels);
4648
4649 /* If a frame has been newly mapped and needs updating,
4650 reprocess its display stuff. */
4651 if (frame_garbaged && do_display)
4652 {
4653 clear_waiting_for_input ();
4654 redisplay_preserve_echo_area ();
4655 if (XINT (read_kbd) < 0)
4656 set_waiting_for_input (&timeout);
4657 }
4658
4659 if (XINT (read_kbd) && detect_input_pending ())
4660 {
4661 nfds = 0;
4662 FD_ZERO (&waitchannels);
4663 }
4664 else
4665 nfds = select (1, &waitchannels, (SELECT_TYPE *)0, (SELECT_TYPE *)0,
4666 &timeout);
4667
4668 xerrno = errno;
4669
4670 /* Make C-g and alarm signals set flags again */
4671 clear_waiting_for_input ();
4672
4673 /* If we woke up due to SIGWINCH, actually change size now. */
4674 do_pending_window_change ();
4675
4676 if (time_limit && nfds == 0 && ! timeout_reduced_for_timers)
4677 /* We waited the full specified time, so return now. */
4678 break;
4679
4680 if (nfds == -1)
4681 {
4682 /* If the system call was interrupted, then go around the
4683 loop again. */
4684 if (xerrno == EINTR)
4685 FD_ZERO (&waitchannels);
4686 else
4687 error ("select error: %s", strerror (xerrno));
4688 }
4689 #ifdef sun
4690 else if (nfds > 0 && (waitchannels & 1) && interrupt_input)
4691 /* System sometimes fails to deliver SIGIO. */
4692 kill (getpid (), SIGIO);
4693 #endif
4694 #ifdef SIGIO
4695 if (XINT (read_kbd) && interrupt_input && (waitchannels & 1))
4696 kill (getpid (), SIGIO);
4697 #endif
4698
4699 /* Check for keyboard input */
4700
4701 if ((XINT (read_kbd) != 0)
4702 && detect_input_pending_run_timers (do_display))
4703 {
4704 swallow_events (do_display);
4705 if (detect_input_pending_run_timers (do_display))
4706 break;
4707 }
4708
4709 /* If there is unread keyboard input, also return. */
4710 if (XINT (read_kbd) != 0
4711 && requeued_events_pending_p ())
4712 break;
4713
4714 /* If wait_for_cell. check for keyboard input
4715 but don't run any timers.
4716 ??? (It seems wrong to me to check for keyboard
4717 input at all when wait_for_cell, but the code
4718 has been this way since July 1994.
4719 Try changing this after version 19.31.) */
4720 if (wait_for_cell
4721 && detect_input_pending ())
4722 {
4723 swallow_events (do_display);
4724 if (detect_input_pending ())
4725 break;
4726 }
4727
4728 /* Exit now if the cell we're waiting for became non-nil. */
4729 if (wait_for_cell && ! NILP (*wait_for_cell))
4730 break;
4731 }
4732
4733 start_polling ();
4734
4735 return 0;
4736 }
4737
4738
4739 DEFUN ("get-buffer-process", Fget_buffer_process, Sget_buffer_process, 1, 1, 0,
4740 /* Don't confuse make-docfile by having two doc strings for this function.
4741 make-docfile does not pay attention to #if, for good reason! */
4742 0)
4743 (name)
4744 register Lisp_Object name;
4745 {
4746 return Qnil;
4747 }
4748
4749 DEFUN ("process-inherit-coding-system-flag",
4750 Fprocess_inherit_coding_system_flag, Sprocess_inherit_coding_system_flag,
4751 1, 1, 0,
4752 /* Don't confuse make-docfile by having two doc strings for this function.
4753 make-docfile does not pay attention to #if, for good reason! */
4754 0)
4755 (process)
4756 register Lisp_Object process;
4757 {
4758 /* Ignore the argument and return the value of
4759 inherit-process-coding-system. */
4760 return inherit_process_coding_system ? Qt : Qnil;
4761 }
4762
4763 /* Kill all processes associated with `buffer'.
4764 If `buffer' is nil, kill all processes.
4765 Since we have no subprocesses, this does nothing. */
4766
4767 void
4768 kill_buffer_processes (buffer)
4769 Lisp_Object buffer;
4770 {
4771 }
4772
4773 void
4774 init_process ()
4775 {
4776 }
4777
4778 void
4779 syms_of_process ()
4780 {
4781 defsubr (&Sget_buffer_process);
4782 defsubr (&Sprocess_inherit_coding_system_flag);
4783 }
4784
4785 \f
4786 #endif /* not subprocesses */