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d0d6b7c5 | 1 | /* Asynchronous subprocess control for GNU Emacs. |
c6c5df7f | 2 | Copyright (C) 1985, 1986, 1987, 1988, 1993 Free Software Foundation, Inc. |
d0d6b7c5 JB |
3 | |
4 | This file is part of GNU Emacs. | |
5 | ||
6 | GNU Emacs is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
1dc77cc3 | 8 | the Free Software Foundation; either version 2, or (at your option) |
d0d6b7c5 JB |
9 | any later version. |
10 | ||
11 | GNU Emacs is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU Emacs; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | ||
21 | #include <signal.h> | |
22 | ||
23 | #include "config.h" | |
24 | ||
6720a7fb JB |
25 | /* This file is split into two parts by the following preprocessor |
26 | conditional. The 'then' clause contains all of the support for | |
27 | asynchronous subprocesses. The 'else' clause contains stub | |
28 | versions of some of the asynchronous subprocess routines that are | |
29 | often called elsewhere in Emacs, so we don't have to #ifdef the | |
30 | sections that call them. */ | |
31 | ||
32 | \f | |
d0d6b7c5 | 33 | #ifdef subprocesses |
d0d6b7c5 JB |
34 | |
35 | #include <stdio.h> | |
36 | #include <errno.h> | |
37 | #include <setjmp.h> | |
38 | #include <sys/types.h> /* some typedefs are used in sys/file.h */ | |
39 | #include <sys/file.h> | |
40 | #include <sys/stat.h> | |
41 | ||
42 | #ifdef HAVE_SOCKETS /* TCP connection support, if kernel can do it */ | |
43 | #include <sys/socket.h> | |
44 | #include <netdb.h> | |
45 | #include <netinet/in.h> | |
46 | #include <arpa/inet.h> | |
47 | #endif /* HAVE_SOCKETS */ | |
48 | ||
49 | #if defined(BSD) || defined(STRIDE) | |
50 | #include <sys/ioctl.h> | |
0ad77c54 | 51 | #if !defined (O_NDELAY) && defined (HAVE_PTYS) && !defined(USG5) |
d0d6b7c5 JB |
52 | #include <fcntl.h> |
53 | #endif /* HAVE_PTYS and no O_NDELAY */ | |
54 | #endif /* BSD or STRIDE */ | |
d0d6b7c5 JB |
55 | |
56 | #ifdef NEED_BSDTTY | |
57 | #include <bsdtty.h> | |
58 | #endif | |
59 | ||
d0d6b7c5 JB |
60 | #ifdef IRIS |
61 | #include <sys/sysmacros.h> /* for "minor" */ | |
62 | #endif /* not IRIS */ | |
63 | ||
64 | #include "systime.h" | |
36ebaafa | 65 | #include "systty.h" |
d0d6b7c5 JB |
66 | |
67 | #include "lisp.h" | |
68 | #include "window.h" | |
69 | #include "buffer.h" | |
70 | #include "process.h" | |
71 | #include "termhooks.h" | |
72 | #include "termopts.h" | |
73 | #include "commands.h" | |
1dc77cc3 | 74 | #include "frame.h" |
d0d6b7c5 JB |
75 | |
76 | Lisp_Object Qrun, Qstop, Qsignal, Qopen, Qclosed; | |
77 | /* Qexit is declared and initialized in eval.c. */ | |
78 | ||
79 | /* a process object is a network connection when its childp field is neither | |
80 | Qt nor Qnil but is instead a string (name of foreign host we | |
81 | are connected to + name of port we are connected to) */ | |
82 | ||
83 | #ifdef HAVE_SOCKETS | |
84 | static Lisp_Object stream_process; | |
85 | ||
86 | #define NETCONN_P(p) (XGCTYPE (XPROCESS (p)->childp) == Lisp_String) | |
87 | #else | |
88 | #define NETCONN_P(p) 0 | |
89 | #endif /* HAVE_SOCKETS */ | |
90 | ||
91 | /* Define first descriptor number available for subprocesses. */ | |
92 | #ifdef VMS | |
93 | #define FIRST_PROC_DESC 1 | |
94 | #else /* Not VMS */ | |
95 | #define FIRST_PROC_DESC 3 | |
96 | #endif | |
97 | ||
98 | /* Define SIGCHLD as an alias for SIGCLD. There are many conditionals | |
99 | testing SIGCHLD. */ | |
100 | ||
101 | #if !defined (SIGCHLD) && defined (SIGCLD) | |
102 | #define SIGCHLD SIGCLD | |
103 | #endif /* SIGCLD */ | |
104 | ||
105 | #include "syssignal.h" | |
106 | ||
107 | /* Define the structure that the wait system call stores. | |
108 | On many systems, there is a structure defined for this. | |
109 | But on vanilla-ish USG systems there is not. */ | |
110 | ||
111 | #ifndef VMS | |
112 | #ifndef WAITTYPE | |
161aa2f8 | 113 | #if (!defined (BSD) && !defined (UNIPLUS) && !defined (STRIDE) && !(defined (HPUX) && !defined (NOMULTIPLEJOBS)) && !defined (HAVE_WAIT_HEADER)) || defined (LINUX) |
d0d6b7c5 JB |
114 | #define WAITTYPE int |
115 | #define WIFSTOPPED(w) ((w&0377) == 0177) | |
116 | #define WIFSIGNALED(w) ((w&0377) != 0177 && (w&~0377) == 0) | |
117 | #define WIFEXITED(w) ((w&0377) == 0) | |
118 | #define WRETCODE(w) (w >> 8) | |
119 | #define WSTOPSIG(w) (w >> 8) | |
d0d6b7c5 | 120 | #define WTERMSIG(w) (w & 0377) |
ce4c9c90 RS |
121 | #ifndef WCOREDUMP |
122 | #define WCOREDUMP(w) ((w&0200) != 0) | |
123 | #endif | |
d0d6b7c5 JB |
124 | #else |
125 | #ifdef BSD4_1 | |
126 | #include <wait.h> | |
127 | #else | |
128 | #include <sys/wait.h> | |
129 | #endif /* not BSD 4.1 */ | |
130 | ||
131 | #define WAITTYPE union wait | |
132 | #define WRETCODE(w) w.w_retcode | |
133 | #define WCOREDUMP(w) w.w_coredump | |
134 | ||
135 | #ifdef HPUX | |
136 | /* HPUX version 7 has broken definitions of these. */ | |
137 | #undef WTERMSIG | |
138 | #undef WSTOPSIG | |
139 | #undef WIFSTOPPED | |
140 | #undef WIFSIGNALED | |
141 | #undef WIFEXITED | |
142 | #endif | |
143 | ||
144 | #ifndef WTERMSIG | |
145 | #define WTERMSIG(w) w.w_termsig | |
146 | #endif | |
147 | #ifndef WSTOPSIG | |
148 | #define WSTOPSIG(w) w.w_stopsig | |
149 | #endif | |
150 | #ifndef WIFSTOPPED | |
151 | #define WIFSTOPPED(w) (WTERMSIG (w) == 0177) | |
152 | #endif | |
153 | #ifndef WIFSIGNALED | |
154 | #define WIFSIGNALED(w) (WTERMSIG (w) != 0177 && (WSTOPSIG (w)) == 0) | |
155 | #endif | |
156 | #ifndef WIFEXITED | |
157 | #define WIFEXITED(w) (WTERMSIG (w) == 0) | |
158 | #endif | |
159 | #endif /* BSD or UNIPLUS or STRIDE */ | |
160 | #endif /* no WAITTYPE */ | |
161 | #else /* VMS */ | |
b0310da4 | 162 | #define WAITTYPE int |
c6c6865d JB |
163 | #define WIFSTOPPED(w) 0 |
164 | #define WIFSIGNALED(w) 0 | |
165 | #define WIFEXITED(w) ((w) != -1) | |
166 | #define WRETCODE(w) (w) | |
167 | #define WSTOPSIG(w) (w) | |
168 | #define WCOREDUMP(w) 0 | |
169 | #define WTERMSIG(w) (w) | |
d0d6b7c5 JB |
170 | #include <ssdef.h> |
171 | #include <iodef.h> | |
172 | #include <clidef.h> | |
173 | #include "vmsproc.h" | |
174 | #endif /* VMS */ | |
175 | ||
176 | extern errno; | |
177 | extern sys_nerr; | |
178 | extern char *sys_errlist[]; | |
179 | ||
180 | #ifndef VMS | |
181 | #ifndef BSD4_1 | |
084fd64a | 182 | #ifndef LINUX |
d0d6b7c5 | 183 | extern char *sys_siglist[]; |
084fd64a | 184 | #endif |
d0d6b7c5 JB |
185 | #else |
186 | char *sys_siglist[] = | |
187 | { | |
188 | "bum signal!!", | |
189 | "hangup", | |
190 | "interrupt", | |
191 | "quit", | |
192 | "illegal instruction", | |
193 | "trace trap", | |
194 | "iot instruction", | |
195 | "emt instruction", | |
196 | "floating point exception", | |
197 | "kill", | |
198 | "bus error", | |
199 | "segmentation violation", | |
200 | "bad argument to system call", | |
201 | "write on a pipe with no one to read it", | |
202 | "alarm clock", | |
203 | "software termination signal from kill", | |
204 | "status signal", | |
205 | "sendable stop signal not from tty", | |
206 | "stop signal from tty", | |
207 | "continue a stopped process", | |
208 | "child status has changed", | |
209 | "background read attempted from control tty", | |
210 | "background write attempted from control tty", | |
211 | "input record available at control tty", | |
212 | "exceeded CPU time limit", | |
213 | "exceeded file size limit" | |
214 | }; | |
215 | #endif | |
216 | #endif /* VMS */ | |
217 | ||
d0d6b7c5 JB |
218 | /* t means use pty, nil means use a pipe, |
219 | maybe other values to come. */ | |
220 | Lisp_Object Vprocess_connection_type; | |
221 | ||
222 | #ifdef SKTPAIR | |
223 | #ifndef HAVE_SOCKETS | |
224 | #include <sys/socket.h> | |
225 | #endif | |
226 | #endif /* SKTPAIR */ | |
227 | ||
228 | /* Number of events of change of status of a process. */ | |
229 | int process_tick; | |
230 | ||
231 | /* Number of events for which the user or sentinel has been notified. */ | |
232 | int update_tick; | |
233 | ||
234 | #ifdef FD_SET | |
235 | /* We could get this from param.h, but better not to depend on finding that. | |
236 | And better not to risk that it might define other symbols used in this | |
237 | file. */ | |
238 | #define MAXDESC 64 | |
239 | #define SELECT_TYPE fd_set | |
240 | #else /* no FD_SET */ | |
241 | #define MAXDESC 32 | |
242 | #define SELECT_TYPE int | |
243 | ||
244 | /* Define the macros to access a single-int bitmap of descriptors. */ | |
245 | #define FD_SET(n, p) (*(p) |= (1 << (n))) | |
246 | #define FD_CLR(n, p) (*(p) &= ~(1 << (n))) | |
247 | #define FD_ISSET(n, p) (*(p) & (1 << (n))) | |
248 | #define FD_ZERO(p) (*(p) = 0) | |
249 | #endif /* no FD_SET */ | |
250 | ||
251 | /* Mask of bits indicating the descriptors that we wait for input on */ | |
252 | ||
253 | SELECT_TYPE input_wait_mask; | |
254 | ||
255 | int delete_exited_processes; | |
256 | ||
257 | /* Indexed by descriptor, gives the process (if any) for that descriptor */ | |
258 | Lisp_Object chan_process[MAXDESC]; | |
259 | ||
260 | /* Alist of elements (NAME . PROCESS) */ | |
261 | Lisp_Object Vprocess_alist; | |
262 | ||
263 | Lisp_Object Qprocessp; | |
264 | ||
265 | Lisp_Object get_process (); | |
266 | ||
267 | /* Buffered-ahead input char from process, indexed by channel. | |
268 | -1 means empty (no char is buffered). | |
269 | Used on sys V where the only way to tell if there is any | |
270 | output from the process is to read at least one char. | |
271 | Always -1 on systems that support FIONREAD. */ | |
272 | ||
273 | int proc_buffered_char[MAXDESC]; | |
274 | \f | |
275 | /* Compute the Lisp form of the process status, p->status, from | |
276 | the numeric status that was returned by `wait'. */ | |
277 | ||
f9738840 JB |
278 | Lisp_Object status_convert (); |
279 | ||
d0d6b7c5 JB |
280 | update_status (p) |
281 | struct Lisp_Process *p; | |
282 | { | |
283 | union { int i; WAITTYPE wt; } u; | |
284 | u.i = XFASTINT (p->raw_status_low) + (XFASTINT (p->raw_status_high) << 16); | |
285 | p->status = status_convert (u.wt); | |
286 | p->raw_status_low = Qnil; | |
287 | p->raw_status_high = Qnil; | |
288 | } | |
289 | ||
290 | /* Convert a process status work in Unix format to | |
291 | the list that we use internally. */ | |
292 | ||
293 | Lisp_Object | |
294 | status_convert (w) | |
295 | WAITTYPE w; | |
296 | { | |
297 | if (WIFSTOPPED (w)) | |
298 | return Fcons (Qstop, Fcons (make_number (WSTOPSIG (w)), Qnil)); | |
299 | else if (WIFEXITED (w)) | |
300 | return Fcons (Qexit, Fcons (make_number (WRETCODE (w)), | |
301 | WCOREDUMP (w) ? Qt : Qnil)); | |
302 | else if (WIFSIGNALED (w)) | |
303 | return Fcons (Qsignal, Fcons (make_number (WTERMSIG (w)), | |
304 | WCOREDUMP (w) ? Qt : Qnil)); | |
305 | else | |
306 | return Qrun; | |
307 | } | |
308 | ||
309 | /* Given a status-list, extract the three pieces of information | |
310 | and store them individually through the three pointers. */ | |
311 | ||
312 | void | |
313 | decode_status (l, symbol, code, coredump) | |
314 | Lisp_Object l; | |
315 | Lisp_Object *symbol; | |
316 | int *code; | |
317 | int *coredump; | |
318 | { | |
319 | Lisp_Object tem; | |
320 | ||
321 | if (XTYPE (l) == Lisp_Symbol) | |
322 | { | |
323 | *symbol = l; | |
324 | *code = 0; | |
325 | *coredump = 0; | |
326 | } | |
327 | else | |
328 | { | |
329 | *symbol = XCONS (l)->car; | |
330 | tem = XCONS (l)->cdr; | |
331 | *code = XFASTINT (XCONS (tem)->car); | |
f9738840 | 332 | tem = XCONS (tem)->cdr; |
d0d6b7c5 JB |
333 | *coredump = !NILP (tem); |
334 | } | |
335 | } | |
336 | ||
337 | /* Return a string describing a process status list. */ | |
338 | ||
339 | Lisp_Object | |
340 | status_message (status) | |
341 | Lisp_Object status; | |
342 | { | |
343 | Lisp_Object symbol; | |
344 | int code, coredump; | |
345 | Lisp_Object string, string2; | |
346 | ||
347 | decode_status (status, &symbol, &code, &coredump); | |
348 | ||
349 | if (EQ (symbol, Qsignal) || EQ (symbol, Qstop)) | |
350 | { | |
b0310da4 | 351 | #ifndef VMS |
d0d6b7c5 | 352 | string = build_string (code < NSIG ? sys_siglist[code] : "unknown"); |
b0310da4 JB |
353 | #else |
354 | string = build_string (code < NSIG ? sys_errlist[code] : "unknown"); | |
355 | #endif | |
d0d6b7c5 JB |
356 | string2 = build_string (coredump ? " (core dumped)\n" : "\n"); |
357 | XSTRING (string)->data[0] = DOWNCASE (XSTRING (string)->data[0]); | |
358 | return concat2 (string, string2); | |
359 | } | |
360 | else if (EQ (symbol, Qexit)) | |
361 | { | |
362 | if (code == 0) | |
363 | return build_string ("finished\n"); | |
f2980264 | 364 | string = Fnumber_to_string (make_number (code)); |
d0d6b7c5 JB |
365 | string2 = build_string (coredump ? " (core dumped)\n" : "\n"); |
366 | return concat2 (build_string ("exited abnormally with code "), | |
367 | concat2 (string, string2)); | |
368 | } | |
369 | else | |
370 | return Fcopy_sequence (Fsymbol_name (symbol)); | |
371 | } | |
372 | \f | |
373 | #ifdef HAVE_PTYS | |
d0d6b7c5 JB |
374 | |
375 | /* Open an available pty, returning a file descriptor. | |
376 | Return -1 on failure. | |
377 | The file name of the terminal corresponding to the pty | |
378 | is left in the variable pty_name. */ | |
379 | ||
380 | char pty_name[24]; | |
381 | ||
382 | int | |
383 | allocate_pty () | |
384 | { | |
385 | struct stat stb; | |
386 | register c, i; | |
387 | int fd; | |
388 | ||
32676c08 JB |
389 | /* Some systems name their pseudoterminals so that there are gaps in |
390 | the usual sequence - for example, on HP9000/S700 systems, there | |
391 | are no pseudoterminals with names ending in 'f'. So we wait for | |
392 | three failures in a row before deciding that we've reached the | |
393 | end of the ptys. */ | |
394 | int failed_count = 0; | |
395 | ||
d0d6b7c5 JB |
396 | #ifdef PTY_ITERATION |
397 | PTY_ITERATION | |
398 | #else | |
399 | for (c = FIRST_PTY_LETTER; c <= 'z'; c++) | |
400 | for (i = 0; i < 16; i++) | |
401 | #endif | |
402 | { | |
403 | #ifdef PTY_NAME_SPRINTF | |
404 | PTY_NAME_SPRINTF | |
d0d6b7c5 JB |
405 | #else |
406 | sprintf (pty_name, "/dev/pty%c%x", c, i); | |
d0d6b7c5 JB |
407 | #endif /* no PTY_NAME_SPRINTF */ |
408 | ||
4d7c105e RS |
409 | #ifdef PTY_OPEN |
410 | PTY_OPEN; | |
411 | #else /* no PTY_OPEN */ | |
32676c08 JB |
412 | #ifdef IRIS |
413 | /* Unusual IRIS code */ | |
414 | *ptyv = open ("/dev/ptc", O_RDWR | O_NDELAY, 0); | |
415 | if (fd < 0) | |
416 | return -1; | |
417 | if (fstat (fd, &stb) < 0) | |
d0d6b7c5 | 418 | return -1; |
4d7c105e | 419 | #else /* not IRIS */ |
32676c08 JB |
420 | if (stat (pty_name, &stb) < 0) |
421 | { | |
422 | failed_count++; | |
423 | if (failed_count >= 3) | |
424 | return -1; | |
425 | } | |
426 | else | |
427 | failed_count = 0; | |
d0d6b7c5 JB |
428 | #ifdef O_NONBLOCK |
429 | fd = open (pty_name, O_RDWR | O_NONBLOCK, 0); | |
430 | #else | |
431 | fd = open (pty_name, O_RDWR | O_NDELAY, 0); | |
432 | #endif | |
4d7c105e RS |
433 | #endif /* not IRIS */ |
434 | #endif /* no PTY_OPEN */ | |
d0d6b7c5 JB |
435 | |
436 | if (fd >= 0) | |
437 | { | |
438 | /* check to make certain that both sides are available | |
439 | this avoids a nasty yet stupid bug in rlogins */ | |
440 | #ifdef PTY_TTY_NAME_SPRINTF | |
441 | PTY_TTY_NAME_SPRINTF | |
d0d6b7c5 JB |
442 | #else |
443 | sprintf (pty_name, "/dev/tty%c%x", c, i); | |
d0d6b7c5 JB |
444 | #endif /* no PTY_TTY_NAME_SPRINTF */ |
445 | #ifndef UNIPLUS | |
446 | if (access (pty_name, 6) != 0) | |
447 | { | |
448 | close (fd); | |
fad97cbe | 449 | #if !defined(IRIS) && !defined(__sgi) |
d0d6b7c5 JB |
450 | continue; |
451 | #else | |
452 | return -1; | |
453 | #endif /* IRIS */ | |
454 | } | |
455 | #endif /* not UNIPLUS */ | |
456 | setup_pty (fd); | |
457 | return fd; | |
458 | } | |
459 | } | |
460 | return -1; | |
461 | } | |
462 | #endif /* HAVE_PTYS */ | |
463 | \f | |
464 | Lisp_Object | |
465 | make_process (name) | |
466 | Lisp_Object name; | |
467 | { | |
468 | register Lisp_Object val, tem, name1; | |
469 | register struct Lisp_Process *p; | |
470 | char suffix[10]; | |
471 | register int i; | |
472 | ||
473 | /* size of process structure includes the vector header, | |
474 | so deduct for that. But struct Lisp_Vector includes the first | |
475 | element, thus deducts too much, so add it back. */ | |
476 | val = Fmake_vector (make_number ((sizeof (struct Lisp_Process) | |
477 | - sizeof (struct Lisp_Vector) | |
478 | + sizeof (Lisp_Object)) | |
479 | / sizeof (Lisp_Object)), | |
480 | Qnil); | |
481 | XSETTYPE (val, Lisp_Process); | |
482 | ||
483 | p = XPROCESS (val); | |
484 | XFASTINT (p->infd) = 0; | |
485 | XFASTINT (p->outfd) = 0; | |
486 | XFASTINT (p->pid) = 0; | |
487 | XFASTINT (p->tick) = 0; | |
488 | XFASTINT (p->update_tick) = 0; | |
489 | p->raw_status_low = Qnil; | |
490 | p->raw_status_high = Qnil; | |
491 | p->status = Qrun; | |
492 | p->mark = Fmake_marker (); | |
493 | ||
494 | /* If name is already in use, modify it until it is unused. */ | |
495 | ||
496 | name1 = name; | |
497 | for (i = 1; ; i++) | |
498 | { | |
499 | tem = Fget_process (name1); | |
500 | if (NILP (tem)) break; | |
501 | sprintf (suffix, "<%d>", i); | |
502 | name1 = concat2 (name, build_string (suffix)); | |
503 | } | |
504 | name = name1; | |
505 | p->name = name; | |
506 | Vprocess_alist = Fcons (Fcons (name, val), Vprocess_alist); | |
507 | return val; | |
508 | } | |
509 | ||
510 | remove_process (proc) | |
511 | register Lisp_Object proc; | |
512 | { | |
513 | register Lisp_Object pair; | |
514 | ||
515 | pair = Frassq (proc, Vprocess_alist); | |
516 | Vprocess_alist = Fdelq (pair, Vprocess_alist); | |
517 | Fset_marker (XPROCESS (proc)->mark, Qnil, Qnil); | |
518 | ||
519 | deactivate_process (proc); | |
520 | } | |
521 | \f | |
522 | DEFUN ("processp", Fprocessp, Sprocessp, 1, 1, 0, | |
523 | "Return t if OBJECT is a process.") | |
524 | (obj) | |
525 | Lisp_Object obj; | |
526 | { | |
527 | return XTYPE (obj) == Lisp_Process ? Qt : Qnil; | |
528 | } | |
529 | ||
530 | DEFUN ("get-process", Fget_process, Sget_process, 1, 1, 0, | |
531 | "Return the process named NAME, or nil if there is none.") | |
532 | (name) | |
533 | register Lisp_Object name; | |
534 | { | |
535 | if (XTYPE (name) == Lisp_Process) | |
536 | return name; | |
537 | CHECK_STRING (name, 0); | |
538 | return Fcdr (Fassoc (name, Vprocess_alist)); | |
539 | } | |
540 | ||
541 | DEFUN ("get-buffer-process", Fget_buffer_process, Sget_buffer_process, 1, 1, 0, | |
542 | "Return the (or, a) process associated with BUFFER.\n\ | |
543 | BUFFER may be a buffer or the name of one.") | |
544 | (name) | |
545 | register Lisp_Object name; | |
546 | { | |
547 | register Lisp_Object buf, tail, proc; | |
548 | ||
549 | if (NILP (name)) return Qnil; | |
550 | buf = Fget_buffer (name); | |
551 | if (NILP (buf)) return Qnil; | |
552 | ||
553 | for (tail = Vprocess_alist; !NILP (tail); tail = Fcdr (tail)) | |
554 | { | |
555 | proc = Fcdr (Fcar (tail)); | |
556 | if (XTYPE (proc) == Lisp_Process && EQ (XPROCESS (proc)->buffer, buf)) | |
557 | return proc; | |
558 | } | |
559 | return Qnil; | |
560 | } | |
561 | ||
ebb9e16f JB |
562 | /* This is how commands for the user decode process arguments. It |
563 | accepts a process, a process name, a buffer, a buffer name, or nil. | |
564 | Buffers denote the first process in the buffer, and nil denotes the | |
565 | current buffer. */ | |
d0d6b7c5 JB |
566 | |
567 | Lisp_Object | |
568 | get_process (name) | |
569 | register Lisp_Object name; | |
570 | { | |
571 | register Lisp_Object proc; | |
572 | if (NILP (name)) | |
573 | proc = Fget_buffer_process (Fcurrent_buffer ()); | |
574 | else | |
575 | { | |
576 | proc = Fget_process (name); | |
577 | if (NILP (proc)) | |
578 | proc = Fget_buffer_process (Fget_buffer (name)); | |
579 | } | |
580 | ||
581 | if (!NILP (proc)) | |
582 | return proc; | |
583 | ||
584 | if (NILP (name)) | |
585 | error ("Current buffer has no process"); | |
586 | else | |
587 | error ("Process %s does not exist", XSTRING (name)->data); | |
588 | /* NOTREACHED */ | |
589 | } | |
590 | ||
591 | DEFUN ("delete-process", Fdelete_process, Sdelete_process, 1, 1, 0, | |
592 | "Delete PROCESS: kill it and forget about it immediately.\n\ | |
ebb9e16f JB |
593 | PROCESS may be a process, a buffer, the name of a process or buffer, or\n\ |
594 | nil, indicating the current buffer's process.") | |
d0d6b7c5 JB |
595 | (proc) |
596 | register Lisp_Object proc; | |
597 | { | |
598 | proc = get_process (proc); | |
599 | XPROCESS (proc)->raw_status_low = Qnil; | |
600 | XPROCESS (proc)->raw_status_high = Qnil; | |
601 | if (NETCONN_P (proc)) | |
602 | { | |
603 | XPROCESS (proc)->status = Fcons (Qexit, Fcons (make_number (0), Qnil)); | |
604 | XSETINT (XPROCESS (proc)->tick, ++process_tick); | |
605 | } | |
606 | else if (XFASTINT (XPROCESS (proc)->infd)) | |
607 | { | |
608 | Fkill_process (proc, Qnil); | |
609 | /* Do this now, since remove_process will make sigchld_handler do nothing. */ | |
610 | XPROCESS (proc)->status | |
611 | = Fcons (Qsignal, Fcons (make_number (SIGKILL), Qnil)); | |
612 | XSETINT (XPROCESS (proc)->tick, ++process_tick); | |
613 | status_notify (); | |
614 | } | |
615 | remove_process (proc); | |
616 | return Qnil; | |
617 | } | |
618 | \f | |
619 | DEFUN ("process-status", Fprocess_status, Sprocess_status, 1, 1, 0, | |
620 | "Return the status of PROCESS: a symbol, one of these:\n\ | |
621 | run -- for a process that is running.\n\ | |
622 | stop -- for a process stopped but continuable.\n\ | |
623 | exit -- for a process that has exited.\n\ | |
624 | signal -- for a process that has got a fatal signal.\n\ | |
625 | open -- for a network stream connection that is open.\n\ | |
626 | closed -- for a network stream connection that is closed.\n\ | |
ebb9e16f JB |
627 | nil -- if arg is a process name and no such process exists.\n\ |
628 | PROCESS may be a process, a buffer, the name of a process or buffer, or\n\ | |
629 | nil, indicating the current buffer's process.") | |
d0d6b7c5 JB |
630 | /* command -- for a command channel opened to Emacs by another process.\n\ |
631 | external -- for an i/o channel opened to Emacs by another process.\n\ */ | |
632 | (proc) | |
633 | register Lisp_Object proc; | |
634 | { | |
635 | register struct Lisp_Process *p; | |
636 | register Lisp_Object status; | |
ebb9e16f | 637 | proc = get_process (proc); |
d0d6b7c5 JB |
638 | if (NILP (proc)) |
639 | return proc; | |
640 | p = XPROCESS (proc); | |
641 | if (!NILP (p->raw_status_low)) | |
642 | update_status (p); | |
643 | status = p->status; | |
644 | if (XTYPE (status) == Lisp_Cons) | |
645 | status = XCONS (status)->car; | |
646 | if (NETCONN_P (proc)) | |
647 | { | |
648 | if (EQ (status, Qrun)) | |
649 | status = Qopen; | |
650 | else if (EQ (status, Qexit)) | |
651 | status = Qclosed; | |
652 | } | |
653 | return status; | |
654 | } | |
655 | ||
656 | DEFUN ("process-exit-status", Fprocess_exit_status, Sprocess_exit_status, | |
657 | 1, 1, 0, | |
658 | "Return the exit status of PROCESS or the signal number that killed it.\n\ | |
659 | If PROCESS has not yet exited or died, return 0.") | |
660 | (proc) | |
661 | register Lisp_Object proc; | |
662 | { | |
663 | CHECK_PROCESS (proc, 0); | |
664 | if (!NILP (XPROCESS (proc)->raw_status_low)) | |
665 | update_status (XPROCESS (proc)); | |
666 | if (XTYPE (XPROCESS (proc)->status) == Lisp_Cons) | |
667 | return XCONS (XCONS (XPROCESS (proc)->status)->cdr)->car; | |
668 | return make_number (0); | |
669 | } | |
670 | ||
671 | DEFUN ("process-id", Fprocess_id, Sprocess_id, 1, 1, 0, | |
672 | "Return the process id of PROCESS.\n\ | |
673 | This is the pid of the Unix process which PROCESS uses or talks to.\n\ | |
674 | For a network connection, this value is nil.") | |
675 | (proc) | |
676 | register Lisp_Object proc; | |
677 | { | |
678 | CHECK_PROCESS (proc, 0); | |
679 | return XPROCESS (proc)->pid; | |
680 | } | |
681 | ||
682 | DEFUN ("process-name", Fprocess_name, Sprocess_name, 1, 1, 0, | |
683 | "Return the name of PROCESS, as a string.\n\ | |
684 | This is the name of the program invoked in PROCESS,\n\ | |
685 | possibly modified to make it unique among process names.") | |
686 | (proc) | |
687 | register Lisp_Object proc; | |
688 | { | |
689 | CHECK_PROCESS (proc, 0); | |
690 | return XPROCESS (proc)->name; | |
691 | } | |
692 | ||
693 | DEFUN ("process-command", Fprocess_command, Sprocess_command, 1, 1, 0, | |
694 | "Return the command that was executed to start PROCESS.\n\ | |
695 | This is a list of strings, the first string being the program executed\n\ | |
696 | and the rest of the strings being the arguments given to it.\n\ | |
697 | For a non-child channel, this is nil.") | |
698 | (proc) | |
699 | register Lisp_Object proc; | |
700 | { | |
701 | CHECK_PROCESS (proc, 0); | |
702 | return XPROCESS (proc)->command; | |
703 | } | |
704 | ||
705 | DEFUN ("set-process-buffer", Fset_process_buffer, Sset_process_buffer, | |
706 | 2, 2, 0, | |
707 | "Set buffer associated with PROCESS to BUFFER (a buffer, or nil).") | |
708 | (proc, buffer) | |
709 | register Lisp_Object proc, buffer; | |
710 | { | |
711 | CHECK_PROCESS (proc, 0); | |
712 | if (!NILP (buffer)) | |
713 | CHECK_BUFFER (buffer, 1); | |
714 | XPROCESS (proc)->buffer = buffer; | |
715 | return buffer; | |
716 | } | |
717 | ||
718 | DEFUN ("process-buffer", Fprocess_buffer, Sprocess_buffer, | |
719 | 1, 1, 0, | |
720 | "Return the buffer PROCESS is associated with.\n\ | |
721 | Output from PROCESS is inserted in this buffer\n\ | |
722 | unless PROCESS has a filter.") | |
723 | (proc) | |
724 | register Lisp_Object proc; | |
725 | { | |
726 | CHECK_PROCESS (proc, 0); | |
727 | return XPROCESS (proc)->buffer; | |
728 | } | |
729 | ||
730 | DEFUN ("process-mark", Fprocess_mark, Sprocess_mark, | |
731 | 1, 1, 0, | |
732 | "Return the marker for the end of the last output from PROCESS.") | |
733 | (proc) | |
734 | register Lisp_Object proc; | |
735 | { | |
736 | CHECK_PROCESS (proc, 0); | |
737 | return XPROCESS (proc)->mark; | |
738 | } | |
739 | ||
740 | DEFUN ("set-process-filter", Fset_process_filter, Sset_process_filter, | |
741 | 2, 2, 0, | |
742 | "Give PROCESS the filter function FILTER; nil means no filter.\n\ | |
743 | When a process has a filter, each time it does output\n\ | |
744 | the entire string of output is passed to the filter.\n\ | |
745 | The filter gets two arguments: the process and the string of output.\n\ | |
746 | If the process has a filter, its buffer is not used for output.") | |
747 | (proc, filter) | |
748 | register Lisp_Object proc, filter; | |
749 | { | |
750 | CHECK_PROCESS (proc, 0); | |
751 | XPROCESS (proc)->filter = filter; | |
752 | return filter; | |
753 | } | |
754 | ||
755 | DEFUN ("process-filter", Fprocess_filter, Sprocess_filter, | |
756 | 1, 1, 0, | |
757 | "Returns the filter function of PROCESS; nil if none.\n\ | |
758 | See `set-process-filter' for more info on filter functions.") | |
759 | (proc) | |
760 | register Lisp_Object proc; | |
761 | { | |
762 | CHECK_PROCESS (proc, 0); | |
763 | return XPROCESS (proc)->filter; | |
764 | } | |
765 | ||
766 | DEFUN ("set-process-sentinel", Fset_process_sentinel, Sset_process_sentinel, | |
767 | 2, 2, 0, | |
768 | "Give PROCESS the sentinel SENTINEL; nil for none.\n\ | |
769 | The sentinel is called as a function when the process changes state.\n\ | |
770 | It gets two arguments: the process, and a string describing the change.") | |
771 | (proc, sentinel) | |
772 | register Lisp_Object proc, sentinel; | |
773 | { | |
774 | CHECK_PROCESS (proc, 0); | |
775 | XPROCESS (proc)->sentinel = sentinel; | |
776 | return sentinel; | |
777 | } | |
778 | ||
779 | DEFUN ("process-sentinel", Fprocess_sentinel, Sprocess_sentinel, | |
780 | 1, 1, 0, | |
781 | "Return the sentinel of PROCESS; nil if none.\n\ | |
782 | See `set-process-sentinel' for more info on sentinels.") | |
783 | (proc) | |
784 | register Lisp_Object proc; | |
785 | { | |
786 | CHECK_PROCESS (proc, 0); | |
787 | return XPROCESS (proc)->sentinel; | |
788 | } | |
789 | ||
790 | DEFUN ("process-kill-without-query", Fprocess_kill_without_query, | |
791 | Sprocess_kill_without_query, 1, 2, 0, | |
792 | "Say no query needed if PROCESS is running when Emacs is exited.\n\ | |
793 | Optional second argument if non-nill says to require a query.\n\ | |
794 | Value is t if a query was formerly required.") | |
795 | (proc, value) | |
796 | register Lisp_Object proc, value; | |
797 | { | |
798 | Lisp_Object tem; | |
799 | ||
800 | CHECK_PROCESS (proc, 0); | |
801 | tem = XPROCESS (proc)->kill_without_query; | |
802 | XPROCESS (proc)->kill_without_query = Fnull (value); | |
803 | ||
804 | return Fnull (tem); | |
805 | } | |
806 | \f | |
807 | Lisp_Object | |
808 | list_processes_1 () | |
809 | { | |
810 | register Lisp_Object tail, tem; | |
811 | Lisp_Object proc, minspace, tem1; | |
812 | register struct buffer *old = current_buffer; | |
813 | register struct Lisp_Process *p; | |
814 | register int state; | |
815 | char tembuf[80]; | |
816 | ||
817 | XFASTINT (minspace) = 1; | |
818 | ||
819 | set_buffer_internal (XBUFFER (Vstandard_output)); | |
820 | Fbuffer_disable_undo (Vstandard_output); | |
821 | ||
822 | current_buffer->truncate_lines = Qt; | |
823 | ||
824 | write_string ("\ | |
825 | Proc Status Buffer Command\n\ | |
826 | ---- ------ ------ -------\n", -1); | |
827 | ||
828 | for (tail = Vprocess_alist; !NILP (tail); tail = Fcdr (tail)) | |
829 | { | |
830 | Lisp_Object symbol; | |
831 | ||
832 | proc = Fcdr (Fcar (tail)); | |
833 | p = XPROCESS (proc); | |
834 | if (NILP (p->childp)) | |
835 | continue; | |
836 | ||
837 | Finsert (1, &p->name); | |
838 | Findent_to (make_number (13), minspace); | |
839 | ||
840 | if (!NILP (p->raw_status_low)) | |
841 | update_status (p); | |
842 | symbol = p->status; | |
843 | if (XTYPE (p->status) == Lisp_Cons) | |
844 | symbol = XCONS (p->status)->car; | |
845 | ||
846 | ||
847 | if (EQ (symbol, Qsignal)) | |
848 | { | |
849 | Lisp_Object tem; | |
850 | tem = Fcar (Fcdr (p->status)); | |
851 | #ifdef VMS | |
852 | if (XINT (tem) < NSIG) | |
b0310da4 | 853 | write_string (sys_errlist [XINT (tem)], -1); |
d0d6b7c5 JB |
854 | else |
855 | #endif | |
856 | Fprinc (symbol, Qnil); | |
857 | } | |
858 | else if (NETCONN_P (proc)) | |
859 | { | |
860 | if (EQ (symbol, Qrun)) | |
861 | write_string ("open", -1); | |
862 | else if (EQ (symbol, Qexit)) | |
863 | write_string ("closed", -1); | |
864 | else | |
865 | Fprinc (symbol, Qnil); | |
866 | } | |
867 | else | |
868 | Fprinc (symbol, Qnil); | |
869 | ||
870 | if (EQ (symbol, Qexit)) | |
871 | { | |
872 | Lisp_Object tem; | |
873 | tem = Fcar (Fcdr (p->status)); | |
874 | if (XFASTINT (tem)) | |
875 | { | |
876 | sprintf (tembuf, " %d", XFASTINT (tem)); | |
877 | write_string (tembuf, -1); | |
878 | } | |
879 | } | |
880 | ||
881 | if (EQ (symbol, Qsignal) || EQ (symbol, Qexit)) | |
882 | remove_process (proc); | |
883 | ||
884 | Findent_to (make_number (22), minspace); | |
885 | if (NILP (p->buffer)) | |
886 | insert_string ("(none)"); | |
887 | else if (NILP (XBUFFER (p->buffer)->name)) | |
888 | insert_string ("(Killed)"); | |
889 | else | |
890 | Finsert (1, &XBUFFER (p->buffer)->name); | |
891 | ||
892 | Findent_to (make_number (37), minspace); | |
893 | ||
894 | if (NETCONN_P (proc)) | |
895 | { | |
896 | sprintf (tembuf, "(network stream connection to %s)\n", | |
897 | XSTRING (p->childp)->data); | |
898 | insert_string (tembuf); | |
899 | } | |
900 | else | |
901 | { | |
902 | tem = p->command; | |
903 | while (1) | |
904 | { | |
905 | tem1 = Fcar (tem); | |
906 | Finsert (1, &tem1); | |
907 | tem = Fcdr (tem); | |
908 | if (NILP (tem)) | |
909 | break; | |
910 | insert_string (" "); | |
911 | } | |
912 | insert_string ("\n"); | |
913 | } | |
914 | } | |
915 | return Qnil; | |
916 | } | |
917 | ||
918 | DEFUN ("list-processes", Flist_processes, Slist_processes, 0, 0, "", | |
919 | "Display a list of all processes.\n\ | |
920 | \(Any processes listed as Exited or Signaled are actually eliminated\n\ | |
921 | after the listing is made.)") | |
922 | () | |
923 | { | |
924 | internal_with_output_to_temp_buffer ("*Process List*", | |
925 | list_processes_1, Qnil); | |
926 | return Qnil; | |
927 | } | |
928 | ||
929 | DEFUN ("process-list", Fprocess_list, Sprocess_list, 0, 0, 0, | |
930 | "Return a list of all processes.") | |
931 | () | |
932 | { | |
933 | return Fmapcar (Qcdr, Vprocess_alist); | |
934 | } | |
935 | \f | |
b0310da4 JB |
936 | /* Starting asynchronous inferior processes. */ |
937 | ||
938 | static Lisp_Object start_process_unwind (); | |
939 | ||
d0d6b7c5 JB |
940 | DEFUN ("start-process", Fstart_process, Sstart_process, 3, MANY, 0, |
941 | "Start a program in a subprocess. Return the process object for it.\n\ | |
942 | Args are NAME BUFFER PROGRAM &rest PROGRAM-ARGS\n\ | |
943 | NAME is name for process. It is modified if necessary to make it unique.\n\ | |
944 | BUFFER is the buffer or (buffer-name) to associate with the process.\n\ | |
945 | Process output goes at end of that buffer, unless you specify\n\ | |
946 | an output stream or filter function to handle the output.\n\ | |
947 | BUFFER may be also nil, meaning that this process is not associated\n\ | |
948 | with any buffer\n\ | |
949 | Third arg is program file name. It is searched for as in the shell.\n\ | |
950 | Remaining arguments are strings to give program as arguments.") | |
951 | (nargs, args) | |
952 | int nargs; | |
953 | register Lisp_Object *args; | |
954 | { | |
1e30af70 | 955 | Lisp_Object buffer, name, program, proc, current_dir, tem; |
d0d6b7c5 JB |
956 | #ifdef VMS |
957 | register unsigned char *new_argv; | |
958 | int len; | |
959 | #else | |
960 | register unsigned char **new_argv; | |
961 | #endif | |
962 | register int i; | |
b0310da4 | 963 | int count = specpdl_ptr - specpdl; |
d0d6b7c5 JB |
964 | |
965 | buffer = args[1]; | |
966 | if (!NILP (buffer)) | |
967 | buffer = Fget_buffer_create (buffer); | |
968 | ||
1e30af70 JB |
969 | /* Make sure that the child will be able to chdir to the current |
970 | buffer's current directory, or its unhandled equivalent. We | |
971 | can't just have the child check for an error when it does the | |
972 | chdir, since it's in a vfork. | |
973 | ||
974 | We have to GCPRO around this because Fexpand_file_name and | |
975 | Funhandled_file_name_directory might call a file name handling | |
976 | function. The argument list is protected by the caller, so all | |
977 | we really have to worry about is buffer. */ | |
978 | { | |
979 | struct gcpro gcpro1, gcpro2; | |
980 | ||
981 | current_dir = current_buffer->directory; | |
982 | ||
983 | GCPRO2 (buffer, current_dir); | |
984 | ||
985 | current_dir = | |
986 | expand_and_dir_to_file | |
82df4891 | 987 | (Funhandled_file_name_directory (current_dir), Qnil); |
1e30af70 JB |
988 | if (NILP (Ffile_accessible_directory_p (current_dir))) |
989 | report_file_error ("Setting current directory", | |
990 | Fcons (current_buffer->directory, Qnil)); | |
991 | ||
992 | UNGCPRO; | |
993 | } | |
994 | ||
d0d6b7c5 JB |
995 | name = args[0]; |
996 | CHECK_STRING (name, 0); | |
997 | ||
998 | program = args[2]; | |
999 | ||
1000 | CHECK_STRING (program, 2); | |
1001 | ||
1002 | #ifdef VMS | |
1003 | /* Make a one member argv with all args concatenated | |
1004 | together separated by a blank. */ | |
1005 | len = XSTRING (program)->size + 2; | |
1006 | for (i = 3; i < nargs; i++) | |
1007 | { | |
1008 | tem = args[i]; | |
1009 | CHECK_STRING (tem, i); | |
1010 | len += XSTRING (tem)->size + 1; /* count the blank */ | |
1011 | } | |
1012 | new_argv = (unsigned char *) alloca (len); | |
1013 | strcpy (new_argv, XSTRING (program)->data); | |
1014 | for (i = 3; i < nargs; i++) | |
1015 | { | |
1016 | tem = args[i]; | |
1017 | CHECK_STRING (tem, i); | |
1018 | strcat (new_argv, " "); | |
1019 | strcat (new_argv, XSTRING (tem)->data); | |
1020 | } | |
b0310da4 JB |
1021 | /* Need to add code here to check for program existence on VMS */ |
1022 | ||
d0d6b7c5 JB |
1023 | #else /* not VMS */ |
1024 | new_argv = (unsigned char **) alloca ((nargs - 1) * sizeof (char *)); | |
1025 | ||
1026 | for (i = 3; i < nargs; i++) | |
1027 | { | |
1028 | tem = args[i]; | |
1029 | CHECK_STRING (tem, i); | |
1030 | new_argv[i - 2] = XSTRING (tem)->data; | |
1031 | } | |
1032 | new_argv[i - 2] = 0; | |
1033 | new_argv[0] = XSTRING (program)->data; | |
1034 | ||
1035 | /* If program file name is not absolute, search our path for it */ | |
1036 | if (new_argv[0][0] != '/') | |
1037 | { | |
1038 | tem = Qnil; | |
5437e9f9 | 1039 | openp (Vexec_path, program, EXEC_SUFFIXES, &tem, 1); |
d0d6b7c5 JB |
1040 | if (NILP (tem)) |
1041 | report_file_error ("Searching for program", Fcons (program, Qnil)); | |
1042 | new_argv[0] = XSTRING (tem)->data; | |
1043 | } | |
1044 | #endif /* not VMS */ | |
1045 | ||
1046 | proc = make_process (name); | |
b0310da4 JB |
1047 | /* If an error occurs and we can't start the process, we want to |
1048 | remove it from the process list. This means that each error | |
1049 | check in create_process doesn't need to call remove_process | |
1050 | itself; it's all taken care of here. */ | |
1051 | record_unwind_protect (start_process_unwind, proc); | |
d0d6b7c5 JB |
1052 | |
1053 | XPROCESS (proc)->childp = Qt; | |
1054 | XPROCESS (proc)->command_channel_p = Qnil; | |
1055 | XPROCESS (proc)->buffer = buffer; | |
1056 | XPROCESS (proc)->sentinel = Qnil; | |
1057 | XPROCESS (proc)->filter = Qnil; | |
1058 | XPROCESS (proc)->command = Flist (nargs - 2, args + 2); | |
1059 | ||
1e30af70 | 1060 | create_process (proc, new_argv, current_dir); |
d0d6b7c5 | 1061 | |
b0310da4 | 1062 | return unbind_to (count, proc); |
d0d6b7c5 JB |
1063 | } |
1064 | ||
b0310da4 JB |
1065 | /* This function is the unwind_protect form for Fstart_process. If |
1066 | PROC doesn't have its pid set, then we know someone has signalled | |
1067 | an error and the process wasn't started successfully, so we should | |
1068 | remove it from the process list. */ | |
1069 | static Lisp_Object | |
1070 | start_process_unwind (proc) | |
1071 | Lisp_Object proc; | |
1072 | { | |
1073 | if (XTYPE (proc) != Lisp_Process) | |
1074 | abort (); | |
1075 | ||
1076 | /* Was PROC started successfully? */ | |
1077 | if (XPROCESS (proc)->pid <= 0) | |
1078 | remove_process (proc); | |
1079 | ||
1080 | return Qnil; | |
1081 | } | |
1082 | ||
1083 | ||
d0d6b7c5 JB |
1084 | SIGTYPE |
1085 | create_process_1 (signo) | |
1086 | int signo; | |
1087 | { | |
1088 | #ifdef USG | |
1089 | /* USG systems forget handlers when they are used; | |
1090 | must reestablish each time */ | |
1091 | signal (signo, create_process_1); | |
1092 | #endif /* USG */ | |
1093 | } | |
1094 | ||
1095 | #if 0 /* This doesn't work; see the note before sigchld_handler. */ | |
1096 | #ifdef USG | |
1097 | #ifdef SIGCHLD | |
1098 | /* Mimic blocking of signals on system V, which doesn't really have it. */ | |
1099 | ||
1100 | /* Nonzero means we got a SIGCHLD when it was supposed to be blocked. */ | |
1101 | int sigchld_deferred; | |
1102 | ||
1103 | SIGTYPE | |
1104 | create_process_sigchld () | |
1105 | { | |
1106 | signal (SIGCHLD, create_process_sigchld); | |
1107 | ||
1108 | sigchld_deferred = 1; | |
1109 | } | |
1110 | #endif | |
1111 | #endif | |
1112 | #endif | |
1113 | ||
1114 | #ifndef VMS /* VMS version of this function is in vmsproc.c. */ | |
1e30af70 | 1115 | create_process (process, new_argv, current_dir) |
d0d6b7c5 JB |
1116 | Lisp_Object process; |
1117 | char **new_argv; | |
1e30af70 | 1118 | Lisp_Object current_dir; |
d0d6b7c5 JB |
1119 | { |
1120 | int pid, inchannel, outchannel, forkin, forkout; | |
1121 | int sv[2]; | |
1122 | #ifdef SIGCHLD | |
1123 | SIGTYPE (*sigchld)(); | |
1124 | #endif | |
1125 | int pty_flag = 0; | |
d0d6b7c5 JB |
1126 | extern char **environ; |
1127 | ||
d0d6b7c5 JB |
1128 | inchannel = outchannel = -1; |
1129 | ||
1130 | #ifdef HAVE_PTYS | |
1131 | if (EQ (Vprocess_connection_type, Qt)) | |
1132 | outchannel = inchannel = allocate_pty (); | |
1133 | ||
d0d6b7c5 JB |
1134 | if (inchannel >= 0) |
1135 | { | |
1136 | #ifndef USG | |
1137 | /* On USG systems it does not work to open the pty's tty here | |
1138 | and then close and reopen it in the child. */ | |
1139 | #ifdef O_NOCTTY | |
1140 | /* Don't let this terminal become our controlling terminal | |
1141 | (in case we don't have one). */ | |
1142 | forkout = forkin = open (pty_name, O_RDWR | O_NOCTTY, 0); | |
1143 | #else | |
1144 | forkout = forkin = open (pty_name, O_RDWR, 0); | |
1145 | #endif | |
1146 | if (forkin < 0) | |
1147 | report_file_error ("Opening pty", Qnil); | |
1148 | #else | |
1149 | forkin = forkout = -1; | |
1150 | #endif /* not USG */ | |
1151 | pty_flag = 1; | |
1152 | } | |
1153 | else | |
1154 | #endif /* HAVE_PTYS */ | |
1155 | #ifdef SKTPAIR | |
1156 | { | |
1157 | if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv) < 0) | |
1158 | report_file_error ("Opening socketpair", Qnil); | |
1159 | outchannel = inchannel = sv[0]; | |
1160 | forkout = forkin = sv[1]; | |
1161 | } | |
1162 | #else /* not SKTPAIR */ | |
1163 | { | |
1164 | pipe (sv); | |
1165 | inchannel = sv[0]; | |
1166 | forkout = sv[1]; | |
1167 | pipe (sv); | |
1168 | outchannel = sv[1]; | |
1169 | forkin = sv[0]; | |
1170 | } | |
1171 | #endif /* not SKTPAIR */ | |
1172 | ||
1173 | #if 0 | |
1174 | /* Replaced by close_process_descs */ | |
1175 | set_exclusive_use (inchannel); | |
1176 | set_exclusive_use (outchannel); | |
1177 | #endif | |
1178 | ||
1179 | /* Stride people say it's a mystery why this is needed | |
1180 | as well as the O_NDELAY, but that it fails without this. */ | |
1181 | #if defined (STRIDE) || (defined (pfa) && defined (HAVE_PTYS)) | |
1182 | { | |
1183 | int one = 1; | |
1184 | ioctl (inchannel, FIONBIO, &one); | |
1185 | } | |
1186 | #endif | |
1187 | ||
1188 | #ifdef O_NONBLOCK | |
1189 | fcntl (inchannel, F_SETFL, O_NONBLOCK); | |
1190 | #else | |
1191 | #ifdef O_NDELAY | |
1192 | fcntl (inchannel, F_SETFL, O_NDELAY); | |
1193 | #endif | |
1194 | #endif | |
1195 | ||
1196 | /* Record this as an active process, with its channels. | |
1197 | As a result, child_setup will close Emacs's side of the pipes. */ | |
1198 | chan_process[inchannel] = process; | |
1199 | XFASTINT (XPROCESS (process)->infd) = inchannel; | |
1200 | XFASTINT (XPROCESS (process)->outfd) = outchannel; | |
1201 | /* Record the tty descriptor used in the subprocess. */ | |
1202 | if (forkin < 0) | |
1203 | XPROCESS (process)->subtty = Qnil; | |
1204 | else | |
1205 | XFASTINT (XPROCESS (process)->subtty) = forkin; | |
1206 | XPROCESS (process)->pty_flag = (pty_flag ? Qt : Qnil); | |
1207 | XPROCESS (process)->status = Qrun; | |
1208 | ||
1209 | /* Delay interrupts until we have a chance to store | |
1210 | the new fork's pid in its process structure */ | |
1211 | #ifdef SIGCHLD | |
1212 | #ifdef BSD4_1 | |
1213 | sighold (SIGCHLD); | |
1214 | #else /* not BSD4_1 */ | |
1215 | #if defined (BSD) || defined (UNIPLUS) || defined (HPUX) | |
1216 | sigsetmask (sigmask (SIGCHLD)); | |
1217 | #else /* ordinary USG */ | |
1218 | #if 0 | |
1219 | sigchld_deferred = 0; | |
1220 | sigchld = signal (SIGCHLD, create_process_sigchld); | |
1221 | #endif | |
1222 | #endif /* ordinary USG */ | |
1223 | #endif /* not BSD4_1 */ | |
1224 | #endif /* SIGCHLD */ | |
1225 | ||
1226 | /* Until we store the proper pid, enable sigchld_handler | |
1227 | to recognize an unknown pid as standing for this process. | |
1228 | It is very important not to let this `marker' value stay | |
1229 | in the table after this function has returned; if it does | |
1230 | it might cause call-process to hang and subsequent asynchronous | |
1231 | processes to get their return values scrambled. */ | |
1232 | XSETINT (XPROCESS (process)->pid, -1); | |
1233 | ||
1234 | { | |
1235 | /* child_setup must clobber environ on systems with true vfork. | |
1236 | Protect it from permanent change. */ | |
1237 | char **save_environ = environ; | |
1238 | ||
1239 | pid = vfork (); | |
1240 | if (pid == 0) | |
1241 | { | |
1242 | int xforkin = forkin; | |
1243 | int xforkout = forkout; | |
1244 | ||
1245 | #if 0 /* This was probably a mistake--it duplicates code later on, | |
1246 | but fails to handle all the cases. */ | |
1247 | /* Make sure SIGCHLD is not blocked in the child. */ | |
1248 | sigsetmask (SIGEMPTYMASK); | |
1249 | #endif | |
1250 | ||
1251 | /* Make the pty be the controlling terminal of the process. */ | |
1252 | #ifdef HAVE_PTYS | |
1253 | /* First, disconnect its current controlling terminal. */ | |
1254 | #ifdef HAVE_SETSID | |
1255 | setsid (); | |
ce4c9c90 RS |
1256 | #ifdef TIOCSCTTY |
1257 | /* Make the pty's terminal the controlling terminal. */ | |
084fd64a RS |
1258 | if (pty_flag) |
1259 | /* We ignore the return value | |
1260 | because faith@cs.unc.edu says that is necessary on Linux. */ | |
1261 | ioctl (xforkin, TIOCSCTTY, 0); | |
ce4c9c90 | 1262 | #endif |
d0d6b7c5 JB |
1263 | #else /* not HAVE_SETSID */ |
1264 | #ifdef USG | |
1265 | /* It's very important to call setpgrp() here and no time | |
1266 | afterwards. Otherwise, we lose our controlling tty which | |
1267 | is set when we open the pty. */ | |
1268 | setpgrp (); | |
1269 | #endif /* USG */ | |
1270 | #endif /* not HAVE_SETSID */ | |
1271 | #ifdef TIOCNOTTY | |
1272 | /* In 4.3BSD, the TIOCSPGRP bug has been fixed, and now you | |
1273 | can do TIOCSPGRP only to the process's controlling tty. */ | |
1274 | if (pty_flag) | |
1275 | { | |
1276 | /* I wonder: would just ioctl (0, TIOCNOTTY, 0) work here? | |
1277 | I can't test it since I don't have 4.3. */ | |
1278 | int j = open ("/dev/tty", O_RDWR, 0); | |
1279 | ioctl (j, TIOCNOTTY, 0); | |
1280 | close (j); | |
1281 | #ifndef USG | |
1282 | /* In order to get a controlling terminal on some versions | |
1283 | of BSD, it is necessary to put the process in pgrp 0 | |
1284 | before it opens the terminal. */ | |
1285 | setpgrp (0, 0); | |
1286 | #endif | |
1287 | } | |
1288 | #endif /* TIOCNOTTY */ | |
1289 | ||
1290 | #if !defined (RTU) && !defined (UNIPLUS) | |
1291 | /*** There is a suggestion that this ought to be a | |
1292 | conditional on TIOCSPGRP. */ | |
1293 | /* Now close the pty (if we had it open) and reopen it. | |
1294 | This makes the pty the controlling terminal of the subprocess. */ | |
1295 | if (pty_flag) | |
1296 | { | |
1297 | /* I wonder if close (open (pty_name, ...)) would work? */ | |
1298 | if (xforkin >= 0) | |
1299 | close (xforkin); | |
1300 | xforkout = xforkin = open (pty_name, O_RDWR, 0); | |
1301 | ||
1302 | if (xforkin < 0) | |
1303 | abort (); | |
1304 | } | |
1305 | #endif /* not UNIPLUS and not RTU */ | |
1306 | #ifdef SETUP_SLAVE_PTY | |
1307 | SETUP_SLAVE_PTY; | |
1308 | #endif /* SETUP_SLAVE_PTY */ | |
1309 | #ifdef AIX | |
1310 | /* On AIX, we've disabled SIGHUP above once we start a child on a pty. | |
1311 | Now reenable it in the child, so it will die when we want it to. */ | |
1312 | if (pty_flag) | |
1313 | signal (SIGHUP, SIG_DFL); | |
1314 | #endif | |
1315 | #endif /* HAVE_PTYS */ | |
1316 | ||
1317 | #ifdef SIGCHLD | |
1318 | #ifdef BSD4_1 | |
1319 | sigrelse (SIGCHLD); | |
1320 | #else /* not BSD4_1 */ | |
1321 | #if defined (BSD) || defined (UNIPLUS) || defined (HPUX) | |
1322 | sigsetmask (SIGEMPTYMASK); | |
1323 | #else /* ordinary USG */ | |
63528b78 | 1324 | #if 0 |
d0d6b7c5 | 1325 | signal (SIGCHLD, sigchld); |
63528b78 | 1326 | #endif |
d0d6b7c5 JB |
1327 | #endif /* ordinary USG */ |
1328 | #endif /* not BSD4_1 */ | |
1329 | #endif /* SIGCHLD */ | |
1330 | ||
1331 | child_setup_tty (xforkout); | |
1332 | child_setup (xforkin, xforkout, xforkout, | |
e065a56e | 1333 | new_argv, 1, current_dir); |
d0d6b7c5 JB |
1334 | } |
1335 | environ = save_environ; | |
1336 | } | |
1337 | ||
1338 | if (pid < 0) | |
b0310da4 JB |
1339 | report_file_error ("Doing vfork", Qnil); |
1340 | ||
d0d6b7c5 JB |
1341 | XFASTINT (XPROCESS (process)->pid) = pid; |
1342 | ||
1343 | FD_SET (inchannel, &input_wait_mask); | |
1344 | ||
1345 | /* If the subfork execv fails, and it exits, | |
1346 | this close hangs. I don't know why. | |
1347 | So have an interrupt jar it loose. */ | |
1348 | stop_polling (); | |
1349 | signal (SIGALRM, create_process_1); | |
1350 | alarm (1); | |
1351 | #ifdef SYSV4_PTYS | |
1352 | /* OK to close only if it's not a pty. Otherwise we need to leave | |
1353 | it open for ioctl to get pgrp when signals are sent, or to send | |
1354 | the interrupt characters through if that's how we're signalling | |
1355 | subprocesses. Alternately if you are concerned about running out | |
1356 | of file descriptors, you could just save the tty name and open | |
1357 | just to do the ioctl. */ | |
1358 | if (NILP (XFASTINT (XPROCESS (process)->pty_flag))) | |
1359 | #endif | |
1360 | { | |
1361 | XPROCESS (process)->subtty = Qnil; | |
1362 | if (forkin >= 0) | |
1363 | close (forkin); | |
1364 | } | |
1365 | alarm (0); | |
1366 | start_polling (); | |
1367 | if (forkin != forkout && forkout >= 0) | |
1368 | close (forkout); | |
1369 | ||
1370 | #ifdef SIGCHLD | |
1371 | #ifdef BSD4_1 | |
1372 | sigrelse (SIGCHLD); | |
1373 | #else /* not BSD4_1 */ | |
1374 | #if defined (BSD) || defined (UNIPLUS) || defined (HPUX) | |
1375 | sigsetmask (SIGEMPTYMASK); | |
1376 | #else /* ordinary USG */ | |
1377 | #if 0 | |
1378 | signal (SIGCHLD, sigchld); | |
1379 | /* Now really handle any of these signals | |
1380 | that came in during this function. */ | |
1381 | if (sigchld_deferred) | |
1382 | kill (getpid (), SIGCHLD); | |
1383 | #endif | |
1384 | #endif /* ordinary USG */ | |
1385 | #endif /* not BSD4_1 */ | |
1386 | #endif /* SIGCHLD */ | |
1387 | } | |
1388 | #endif /* not VMS */ | |
1389 | ||
1390 | #ifdef HAVE_SOCKETS | |
1391 | ||
1392 | /* open a TCP network connection to a given HOST/SERVICE. Treated | |
1393 | exactly like a normal process when reading and writing. Only | |
1394 | differences are in status display and process deletion. A network | |
1395 | connection has no PID; you cannot signal it. All you can do is | |
1396 | deactivate and close it via delete-process */ | |
1397 | ||
1398 | DEFUN ("open-network-stream", Fopen_network_stream, Sopen_network_stream, | |
1399 | 4, 4, 0, | |
1400 | "Open a TCP connection for a service to a host.\n\ | |
1401 | Returns a subprocess-object to represent the connection.\n\ | |
1402 | Input and output work as for subprocesses; `delete-process' closes it.\n\ | |
1403 | Args are NAME BUFFER HOST SERVICE.\n\ | |
1404 | NAME is name for process. It is modified if necessary to make it unique.\n\ | |
1405 | BUFFER is the buffer (or buffer-name) to associate with the process.\n\ | |
1406 | Process output goes at end of that buffer, unless you specify\n\ | |
1407 | an output stream or filter function to handle the output.\n\ | |
1408 | BUFFER may be also nil, meaning that this process is not associated\n\ | |
1409 | with any buffer\n\ | |
1410 | Third arg is name of the host to connect to, or its IP address.\n\ | |
1411 | Fourth arg SERVICE is name of the service desired, or an integer\n\ | |
1412 | specifying a port number to connect to.") | |
1413 | (name, buffer, host, service) | |
1414 | Lisp_Object name, buffer, host, service; | |
1415 | { | |
1416 | Lisp_Object proc; | |
1417 | register int i; | |
1418 | struct sockaddr_in address; | |
1419 | struct servent *svc_info; | |
1420 | struct hostent *host_info_ptr, host_info; | |
1421 | char *(addr_list[2]); | |
1422 | unsigned long numeric_addr; | |
1423 | int s, outch, inch; | |
1424 | char errstring[80]; | |
1425 | int port; | |
1426 | struct hostent host_info_fixed; | |
1427 | struct gcpro gcpro1, gcpro2, gcpro3, gcpro4; | |
1428 | ||
1429 | GCPRO4 (name, buffer, host, service); | |
1430 | CHECK_STRING (name, 0); | |
1431 | CHECK_STRING (host, 0); | |
1432 | if (XTYPE(service) == Lisp_Int) | |
1433 | port = htons ((unsigned short) XINT (service)); | |
1434 | else | |
1435 | { | |
1436 | CHECK_STRING (service, 0); | |
1437 | svc_info = getservbyname (XSTRING (service)->data, "tcp"); | |
1438 | if (svc_info == 0) | |
1439 | error ("Unknown service \"%s\"", XSTRING (service)->data); | |
1440 | port = svc_info->s_port; | |
1441 | } | |
1442 | ||
1443 | host_info_ptr = gethostbyname (XSTRING (host)->data); | |
1444 | if (host_info_ptr == 0) | |
1445 | /* Attempt to interpret host as numeric inet address */ | |
1446 | { | |
1447 | numeric_addr = inet_addr (XSTRING (host)->data); | |
1448 | if (numeric_addr == -1) | |
1449 | error ("Unknown host \"%s\"", XSTRING (host)->data); | |
1450 | ||
1451 | host_info_ptr = &host_info; | |
1452 | host_info.h_name = 0; | |
1453 | host_info.h_aliases = 0; | |
1454 | host_info.h_addrtype = AF_INET; | |
39a21be6 JB |
1455 | #ifdef h_addr |
1456 | /* Older machines have only one address slot called h_addr. | |
1457 | Newer machines have h_addr_list, but #define h_addr to | |
1458 | be its first element. */ | |
1459 | host_info.h_addr_list = &(addr_list[0]); | |
1460 | #endif | |
1461 | host_info.h_addr = (char*)(&numeric_addr); | |
d0d6b7c5 JB |
1462 | addr_list[1] = 0; |
1463 | host_info.h_length = strlen (addr_list[0]); | |
1464 | } | |
1465 | ||
1466 | bzero (&address, sizeof address); | |
1467 | bcopy (host_info_ptr->h_addr, (char *) &address.sin_addr, | |
1468 | host_info_ptr->h_length); | |
1469 | address.sin_family = host_info_ptr->h_addrtype; | |
1470 | address.sin_port = port; | |
1471 | ||
1472 | s = socket (host_info_ptr->h_addrtype, SOCK_STREAM, 0); | |
1473 | if (s < 0) | |
1474 | report_file_error ("error creating socket", Fcons (name, Qnil)); | |
1475 | ||
1476 | loop: | |
1477 | if (connect (s, &address, sizeof address) == -1) | |
1478 | { | |
1479 | int xerrno = errno; | |
1480 | if (errno == EINTR) | |
1481 | goto loop; | |
1482 | close (s); | |
1483 | errno = xerrno; | |
1484 | report_file_error ("connection failed", | |
1485 | Fcons (host, Fcons (name, Qnil))); | |
1486 | } | |
1487 | ||
1488 | inch = s; | |
1489 | outch = dup (s); | |
1490 | if (outch < 0) | |
1491 | report_file_error ("error duplicating socket", Fcons (name, Qnil)); | |
1492 | ||
1493 | if (!NILP (buffer)) | |
1494 | buffer = Fget_buffer_create (buffer); | |
1495 | proc = make_process (name); | |
1496 | ||
1497 | chan_process[inch] = proc; | |
1498 | ||
1499 | #ifdef O_NONBLOCK | |
1500 | fcntl (inch, F_SETFL, O_NONBLOCK); | |
1501 | #else | |
1502 | #ifdef O_NDELAY | |
1503 | fcntl (inch, F_SETFL, O_NDELAY); | |
1504 | #endif | |
1505 | #endif | |
1506 | ||
1507 | XPROCESS (proc)->childp = host; | |
1508 | XPROCESS (proc)->command_channel_p = Qnil; | |
1509 | XPROCESS (proc)->buffer = buffer; | |
1510 | XPROCESS (proc)->sentinel = Qnil; | |
1511 | XPROCESS (proc)->filter = Qnil; | |
1512 | XPROCESS (proc)->command = Qnil; | |
1513 | XPROCESS (proc)->pid = Qnil; | |
1514 | XFASTINT (XPROCESS (proc)->infd) = s; | |
1515 | XFASTINT (XPROCESS (proc)->outfd) = outch; | |
1516 | XPROCESS (proc)->status = Qrun; | |
1517 | FD_SET (inch, &input_wait_mask); | |
1518 | ||
1519 | UNGCPRO; | |
1520 | return proc; | |
1521 | } | |
1522 | #endif /* HAVE_SOCKETS */ | |
1523 | ||
1524 | deactivate_process (proc) | |
1525 | Lisp_Object proc; | |
1526 | { | |
1527 | register int inchannel, outchannel; | |
1528 | register struct Lisp_Process *p = XPROCESS (proc); | |
1529 | ||
1530 | inchannel = XFASTINT (p->infd); | |
1531 | outchannel = XFASTINT (p->outfd); | |
1532 | ||
1533 | if (inchannel) | |
1534 | { | |
1535 | /* Beware SIGCHLD hereabouts. */ | |
1536 | flush_pending_output (inchannel); | |
1537 | #ifdef VMS | |
1538 | { | |
1539 | VMS_PROC_STUFF *get_vms_process_pointer (), *vs; | |
1540 | sys$dassgn (outchannel); | |
c6c6865d | 1541 | vs = get_vms_process_pointer (p->pid); |
d0d6b7c5 JB |
1542 | if (vs) |
1543 | give_back_vms_process_stuff (vs); | |
1544 | } | |
1545 | #else | |
1546 | close (inchannel); | |
1547 | if (outchannel && outchannel != inchannel) | |
1548 | close (outchannel); | |
1549 | #endif | |
1550 | ||
1551 | XFASTINT (p->infd) = 0; | |
1552 | XFASTINT (p->outfd) = 0; | |
1553 | chan_process[inchannel] = Qnil; | |
1554 | FD_CLR (inchannel, &input_wait_mask); | |
1555 | } | |
1556 | } | |
1557 | ||
1558 | /* Close all descriptors currently in use for communication | |
1559 | with subprocess. This is used in a newly-forked subprocess | |
1560 | to get rid of irrelevant descriptors. */ | |
1561 | ||
1562 | close_process_descs () | |
1563 | { | |
1564 | int i; | |
1565 | for (i = 0; i < MAXDESC; i++) | |
1566 | { | |
1567 | Lisp_Object process; | |
1568 | process = chan_process[i]; | |
1569 | if (!NILP (process)) | |
1570 | { | |
1571 | int in = XFASTINT (XPROCESS (process)->infd); | |
1572 | int out = XFASTINT (XPROCESS (process)->outfd); | |
1573 | if (in) | |
1574 | close (in); | |
1575 | if (out && in != out) | |
1576 | close (out); | |
1577 | } | |
1578 | } | |
1579 | } | |
1580 | \f | |
1581 | DEFUN ("accept-process-output", Faccept_process_output, Saccept_process_output, | |
1582 | 0, 3, 0, | |
1583 | "Allow any pending output from subprocesses to be read by Emacs.\n\ | |
1584 | It is read into the process' buffers or given to their filter functions.\n\ | |
1585 | Non-nil arg PROCESS means do not return until some output has been received\n\ | |
1586 | from PROCESS.\n\ | |
1587 | Non-nil second arg TIMEOUT and third arg TIMEOUT-MSECS are number of\n\ | |
1588 | seconds and microseconds to wait; return after that much time whether\n\ | |
1589 | or not there is input.\n\ | |
1590 | Return non-nil iff we received any output before the timeout expired.") | |
1591 | (proc, timeout, timeout_msecs) | |
1592 | register Lisp_Object proc, timeout, timeout_msecs; | |
1593 | { | |
1594 | int seconds; | |
1595 | int useconds; | |
1596 | ||
1597 | if (! NILP (timeout_msecs)) | |
1598 | { | |
1599 | CHECK_NUMBER (timeout_msecs, 2); | |
1600 | useconds = XINT (timeout_msecs); | |
1601 | if (XTYPE (timeout) != Lisp_Int) | |
1602 | XSET (timeout, Lisp_Int, 0); | |
1603 | ||
1604 | { | |
1605 | int carry = useconds / 1000000; | |
1606 | ||
1607 | XSETINT (timeout, XINT (timeout) + carry); | |
1608 | useconds -= carry * 1000000; | |
1609 | ||
1610 | /* I think this clause is necessary because C doesn't | |
1611 | guarantee a particular rounding direction for negative | |
1612 | integers. */ | |
1613 | if (useconds < 0) | |
1614 | { | |
1615 | XSETINT (timeout, XINT (timeout) - 1); | |
1616 | useconds += 1000000; | |
1617 | } | |
1618 | } | |
1619 | } | |
de946e5a RS |
1620 | else |
1621 | useconds = 0; | |
d0d6b7c5 JB |
1622 | |
1623 | if (! NILP (timeout)) | |
1624 | { | |
1625 | CHECK_NUMBER (timeout, 1); | |
1626 | seconds = XINT (timeout); | |
1627 | if (seconds <= 0) | |
1628 | seconds = -1; | |
1629 | } | |
1630 | else | |
1631 | { | |
1632 | if (NILP (proc)) | |
1633 | seconds = -1; | |
1634 | else | |
1635 | seconds = 0; | |
1636 | } | |
1637 | ||
f76475ad JB |
1638 | if (NILP (proc)) |
1639 | XFASTINT (proc) = 0; | |
1640 | ||
d0d6b7c5 | 1641 | return |
f76475ad | 1642 | (wait_reading_process_input (seconds, useconds, proc, 0) |
d0d6b7c5 JB |
1643 | ? Qt : Qnil); |
1644 | } | |
1645 | ||
1646 | /* This variable is different from waiting_for_input in keyboard.c. | |
1647 | It is used to communicate to a lisp process-filter/sentinel (via the | |
1648 | function Fwaiting_for_user_input_p below) whether emacs was waiting | |
1649 | for user-input when that process-filter was called. | |
1650 | waiting_for_input cannot be used as that is by definition 0 when | |
1651 | lisp code is being evalled */ | |
1652 | static int waiting_for_user_input_p; | |
1653 | ||
1654 | /* Read and dispose of subprocess output while waiting for timeout to | |
1655 | elapse and/or keyboard input to be available. | |
1656 | ||
1657 | time_limit is: | |
1658 | timeout in seconds, or | |
1659 | zero for no limit, or | |
1660 | -1 means gobble data immediately available but don't wait for any. | |
1661 | ||
6e4f3667 JB |
1662 | microsecs is: |
1663 | an additional duration to wait (if time_limit is greater than | |
1664 | zero), specified in millisec. | |
1665 | ||
f76475ad | 1666 | read_kbd is a lisp value: |
d0d6b7c5 JB |
1667 | 0 to ignore keyboard input, or |
1668 | 1 to return when input is available, or | |
84aa3ace | 1669 | -1 meaning caller will actually read the input, so don't throw to |
d0d6b7c5 | 1670 | the quit handler, or |
84aa3ace | 1671 | a cons cell, meaning wait wait until its car is non-nil, or |
f76475ad JB |
1672 | a process object, meaning wait until something arrives from that |
1673 | process. The return value is true iff we read some input from | |
1674 | that process. | |
d0d6b7c5 JB |
1675 | |
1676 | do_display != 0 means redisplay should be done to show subprocess | |
1677 | output that arrives. | |
1678 | ||
1679 | If read_kbd is a pointer to a struct Lisp_Process, then the | |
1680 | function returns true iff we received input from that process | |
1681 | before the timeout elapsed. | |
1682 | Otherwise, return true iff we recieved input from any process. */ | |
1683 | ||
1684 | wait_reading_process_input (time_limit, microsecs, read_kbd, do_display) | |
f76475ad JB |
1685 | int time_limit, microsecs; |
1686 | Lisp_Object read_kbd; | |
1687 | int do_display; | |
d0d6b7c5 JB |
1688 | { |
1689 | register int channel, nfds, m; | |
1690 | static SELECT_TYPE Available; | |
1691 | int xerrno; | |
1692 | Lisp_Object proc; | |
1693 | EMACS_TIME timeout, end_time, garbage; | |
1694 | SELECT_TYPE Atemp; | |
1695 | int wait_channel = 0; | |
1696 | struct Lisp_Process *wait_proc = 0; | |
1697 | int got_some_input = 0; | |
84aa3ace | 1698 | Lisp_Object *wait_for_cell = 0; |
d0d6b7c5 JB |
1699 | |
1700 | FD_ZERO (&Available); | |
1701 | ||
f76475ad JB |
1702 | /* If read_kbd is a process to watch, set wait_proc and wait_channel |
1703 | accordingly. */ | |
1704 | if (XTYPE (read_kbd) == Lisp_Process) | |
d0d6b7c5 | 1705 | { |
f76475ad | 1706 | wait_proc = XPROCESS (read_kbd); |
d0d6b7c5 | 1707 | wait_channel = XFASTINT (wait_proc->infd); |
f76475ad | 1708 | XFASTINT (read_kbd) = 0; |
d0d6b7c5 JB |
1709 | } |
1710 | ||
84aa3ace RS |
1711 | /* If waiting for non-nil in a cell, record where. */ |
1712 | if (XTYPE (read_kbd) == Lisp_Cons) | |
1713 | { | |
1714 | wait_for_cell = &XCONS (read_kbd)->car; | |
1715 | XFASTINT (read_kbd) = 0; | |
1716 | } | |
1717 | ||
f76475ad | 1718 | waiting_for_user_input_p = XINT (read_kbd); |
d0d6b7c5 JB |
1719 | |
1720 | /* Since we may need to wait several times, | |
1721 | compute the absolute time to return at. */ | |
1722 | if (time_limit || microsecs) | |
1723 | { | |
1724 | EMACS_GET_TIME (end_time); | |
1725 | EMACS_SET_SECS_USECS (timeout, time_limit, microsecs); | |
1726 | EMACS_ADD_TIME (end_time, end_time, timeout); | |
1727 | } | |
1728 | ||
d0d6b7c5 JB |
1729 | while (1) |
1730 | { | |
1731 | /* If calling from keyboard input, do not quit | |
1732 | since we want to return C-g as an input character. | |
1733 | Otherwise, do pending quit if requested. */ | |
f76475ad | 1734 | if (XINT (read_kbd) >= 0) |
d0d6b7c5 JB |
1735 | QUIT; |
1736 | ||
d0d6b7c5 JB |
1737 | /* Compute time from now till when time limit is up */ |
1738 | /* Exit if already run out */ | |
1739 | if (time_limit == -1) | |
1740 | { | |
1741 | /* -1 specified for timeout means | |
1742 | gobble output available now | |
1743 | but don't wait at all. */ | |
1744 | ||
1745 | EMACS_SET_SECS_USECS (timeout, 0, 0); | |
1746 | } | |
1747 | else if (time_limit || microsecs) | |
1748 | { | |
1749 | EMACS_GET_TIME (timeout); | |
1750 | EMACS_SUB_TIME (timeout, end_time, timeout); | |
1751 | if (EMACS_TIME_NEG_P (timeout)) | |
1752 | break; | |
1753 | } | |
1754 | else | |
1755 | { | |
1756 | EMACS_SET_SECS_USECS (timeout, 100000, 0); | |
1757 | } | |
1758 | ||
90ab1a81 JB |
1759 | /* Cause C-g and alarm signals to take immediate action, |
1760 | and cause input available signals to zero out timeout. | |
1761 | ||
1762 | It is important that we do this before checking for process | |
1763 | activity. If we get a SIGCHLD after the explicit checks for | |
1764 | process activity, timeout is the only way we will know. */ | |
1765 | if (XINT (read_kbd) < 0) | |
1766 | set_waiting_for_input (&timeout); | |
1767 | ||
6be429b1 JB |
1768 | /* If status of something has changed, and no input is |
1769 | available, notify the user of the change right away. After | |
1770 | this explicit check, we'll let the SIGCHLD handler zap | |
1771 | timeout to get our attention. */ | |
1772 | if (update_tick != process_tick && do_display) | |
1773 | { | |
1774 | Atemp = input_wait_mask; | |
1775 | EMACS_SET_SECS_USECS (timeout, 0, 0); | |
1776 | if (select (MAXDESC, &Atemp, 0, 0, &timeout) <= 0) | |
90ab1a81 JB |
1777 | { |
1778 | /* It's okay for us to do this and then continue with | |
1779 | the loop, since timeout has already been zeroed out. */ | |
1780 | clear_waiting_for_input (); | |
1781 | status_notify (); | |
1782 | } | |
6be429b1 JB |
1783 | } |
1784 | ||
1785 | /* Don't wait for output from a non-running process. */ | |
1786 | if (wait_proc != 0 && !NILP (wait_proc->raw_status_low)) | |
1787 | update_status (wait_proc); | |
1788 | if (wait_proc != 0 | |
1789 | && ! EQ (wait_proc->status, Qrun)) | |
9aa2a7f4 JB |
1790 | { |
1791 | clear_waiting_for_input (); | |
1792 | break; | |
1793 | } | |
6be429b1 | 1794 | |
d0d6b7c5 JB |
1795 | /* Wait till there is something to do */ |
1796 | ||
1797 | Available = input_wait_mask; | |
f76475ad | 1798 | if (! XINT (read_kbd)) |
d0d6b7c5 JB |
1799 | FD_CLR (0, &Available); |
1800 | ||
ff11dfa1 | 1801 | /* If frame size has changed or the window is newly mapped, |
ffd56f97 JB |
1802 | redisplay now, before we start to wait. There is a race |
1803 | condition here; if a SIGIO arrives between now and the select | |
016899c0 JB |
1804 | and indicates that a frame is trashed, the select may block |
1805 | displaying a trashed screen. */ | |
ff11dfa1 | 1806 | if (frame_garbaged) |
ffd56f97 JB |
1807 | redisplay_preserve_echo_area (); |
1808 | ||
f76475ad | 1809 | if (XINT (read_kbd) && detect_input_pending ()) |
d0d6b7c5 JB |
1810 | nfds = 0; |
1811 | else | |
d0d6b7c5 | 1812 | nfds = select (MAXDESC, &Available, 0, 0, &timeout); |
6720a7fb | 1813 | |
d0d6b7c5 JB |
1814 | xerrno = errno; |
1815 | ||
1816 | /* Make C-g and alarm signals set flags again */ | |
1817 | clear_waiting_for_input (); | |
1818 | ||
1819 | /* If we woke up due to SIGWINCH, actually change size now. */ | |
1820 | do_pending_window_change (); | |
1821 | ||
ffd56f97 | 1822 | if (time_limit && nfds == 0) /* timeout elapsed */ |
d0d6b7c5 JB |
1823 | break; |
1824 | if (nfds < 0) | |
1825 | { | |
1826 | if (xerrno == EINTR) | |
1827 | FD_ZERO (&Available); | |
b0310da4 JB |
1828 | #ifdef ultrix |
1829 | /* Ultrix select seems to return ENOMEM when it is | |
1830 | interrupted. Treat it just like EINTR. Bleah. Note | |
1831 | that we want to test for the "ultrix" CPP symbol, not | |
1832 | "__ultrix__"; the latter is only defined under GCC, but | |
1833 | not by DEC's bundled CC. -JimB */ | |
8058415c JB |
1834 | else if (xerrno == ENOMEM) |
1835 | FD_ZERO (&Available); | |
1836 | #endif | |
d0d6b7c5 JB |
1837 | #ifdef ALLIANT |
1838 | /* This happens for no known reason on ALLIANT. | |
1839 | I am guessing that this is the right response. -- RMS. */ | |
1840 | else if (xerrno == EFAULT) | |
1841 | FD_ZERO (&Available); | |
1842 | #endif | |
1843 | else if (xerrno == EBADF) | |
1844 | { | |
1845 | #ifdef AIX | |
1846 | /* AIX doesn't handle PTY closure the same way BSD does. On AIX, | |
1847 | the child's closure of the pts gives the parent a SIGHUP, and | |
1848 | the ptc file descriptor is automatically closed, | |
1849 | yielding EBADF here or at select() call above. | |
1850 | So, SIGHUP is ignored (see def of PTY_TTY_NAME_SPRINTF | |
1851 | in m-ibmrt-aix.h), and here we just ignore the select error. | |
1852 | Cleanup occurs c/o status_notify after SIGCLD. */ | |
ffd56f97 | 1853 | FD_ZERO (&Available); /* Cannot depend on values returned */ |
d0d6b7c5 JB |
1854 | #else |
1855 | abort (); | |
1856 | #endif | |
1857 | } | |
1858 | else | |
1859 | error("select error: %s", sys_errlist[xerrno]); | |
1860 | } | |
26ec91de | 1861 | #if defined(sun) && !defined(USG5_4) |
d0d6b7c5 | 1862 | else if (nfds > 0 && FD_ISSET (0, &Available) && interrupt_input) |
e0109153 JB |
1863 | /* System sometimes fails to deliver SIGIO. |
1864 | ||
1865 | David J. Mackenzie says that Emacs doesn't compile under | |
1866 | Solaris if this code is enabled, thus the USG5_4 in the CPP | |
1867 | conditional. "I haven't noticed any ill effects so far. | |
1868 | If you find a Solaris expert somewhere, they might know | |
1869 | better." */ | |
d0d6b7c5 JB |
1870 | kill (getpid (), SIGIO); |
1871 | #endif | |
1872 | ||
1873 | /* Check for keyboard input */ | |
1874 | /* If there is any, return immediately | |
1875 | to give it higher priority than subprocesses */ | |
1876 | ||
f76475ad | 1877 | if (XINT (read_kbd) && detect_input_pending ()) |
6e103bac RS |
1878 | { |
1879 | swallow_events (); | |
1880 | if (detect_input_pending ()) | |
1881 | break; | |
1882 | } | |
d0d6b7c5 | 1883 | |
84aa3ace RS |
1884 | /* Exit now if the cell we're waiting for became non-nil. */ |
1885 | if (wait_for_cell && ! NILP (*wait_for_cell)) | |
1886 | break; | |
1887 | ||
4746118a | 1888 | #ifdef SIGIO |
d0d6b7c5 JB |
1889 | /* If we think we have keyboard input waiting, but didn't get SIGIO |
1890 | go read it. This can happen with X on BSD after logging out. | |
1891 | In that case, there really is no input and no SIGIO, | |
1892 | but select says there is input. */ | |
1893 | ||
f76475ad | 1894 | if (XINT (read_kbd) && interrupt_input && (FD_ISSET (fileno (stdin), &Available))) |
d0d6b7c5 | 1895 | kill (0, SIGIO); |
4746118a | 1896 | #endif |
d0d6b7c5 | 1897 | |
d0d6b7c5 JB |
1898 | if (! wait_proc) |
1899 | got_some_input |= nfds > 0; | |
1900 | ||
32676c08 JB |
1901 | /* If checking input just got us a size-change event from X, |
1902 | obey it now if we should. */ | |
f76475ad | 1903 | if (XINT (read_kbd)) |
32676c08 JB |
1904 | do_pending_window_change (); |
1905 | ||
d0d6b7c5 JB |
1906 | /* Check for data from a process or a command channel */ |
1907 | for (channel = FIRST_PROC_DESC; channel < MAXDESC; channel++) | |
1908 | { | |
1909 | if (FD_ISSET (channel, &Available)) | |
1910 | { | |
1911 | int nread; | |
1912 | ||
1913 | /* If waiting for this channel, arrange to return as | |
1914 | soon as no more input to be processed. No more | |
1915 | waiting. */ | |
1916 | if (wait_channel == channel) | |
1917 | { | |
1918 | wait_channel = 0; | |
1919 | time_limit = -1; | |
1920 | got_some_input = 1; | |
1921 | } | |
1922 | proc = chan_process[channel]; | |
1923 | if (NILP (proc)) | |
1924 | continue; | |
1925 | ||
d0d6b7c5 JB |
1926 | /* Read data from the process, starting with our |
1927 | buffered-ahead character if we have one. */ | |
1928 | ||
1929 | nread = read_process_output (proc, channel); | |
1930 | if (nread > 0) | |
1931 | { | |
1932 | /* Since read_process_output can run a filter, | |
1933 | which can call accept-process-output, | |
1934 | don't try to read from any other processes | |
1935 | before doing the select again. */ | |
1936 | FD_ZERO (&Available); | |
1937 | ||
1938 | if (do_display) | |
1939 | redisplay_preserve_echo_area (); | |
1940 | } | |
1941 | #ifdef EWOULDBLOCK | |
1942 | else if (nread == -1 && errno == EWOULDBLOCK) | |
1943 | ; | |
1944 | #else | |
1945 | #ifdef O_NONBLOCK | |
1946 | else if (nread == -1 && errno == EAGAIN) | |
1947 | ; | |
1948 | #else | |
1949 | #ifdef O_NDELAY | |
1950 | else if (nread == -1 && errno == EAGAIN) | |
1951 | ; | |
1952 | /* Note that we cannot distinguish between no input | |
1953 | available now and a closed pipe. | |
1954 | With luck, a closed pipe will be accompanied by | |
1955 | subprocess termination and SIGCHLD. */ | |
1956 | else if (nread == 0 && !NETCONN_P (proc)) | |
1957 | ; | |
ffd56f97 JB |
1958 | #endif /* O_NDELAY */ |
1959 | #endif /* O_NONBLOCK */ | |
1960 | #endif /* EWOULDBLOCK */ | |
d0d6b7c5 JB |
1961 | #ifdef HAVE_PTYS |
1962 | /* On some OSs with ptys, when the process on one end of | |
1963 | a pty exits, the other end gets an error reading with | |
1964 | errno = EIO instead of getting an EOF (0 bytes read). | |
1965 | Therefore, if we get an error reading and errno = | |
1966 | EIO, just continue, because the child process has | |
1967 | exited and should clean itself up soon (e.g. when we | |
1968 | get a SIGCHLD). */ | |
1969 | else if (nread == -1 && errno == EIO) | |
1970 | ; | |
ffd56f97 JB |
1971 | #endif /* HAVE_PTYS */ |
1972 | /* If we can detect process termination, don't consider the process | |
1973 | gone just because its pipe is closed. */ | |
d0d6b7c5 JB |
1974 | #ifdef SIGCHLD |
1975 | else if (nread == 0 && !NETCONN_P (proc)) | |
1976 | ; | |
1977 | #endif | |
1978 | else | |
1979 | { | |
1980 | /* Preserve status of processes already terminated. */ | |
1981 | XSETINT (XPROCESS (proc)->tick, ++process_tick); | |
1982 | deactivate_process (proc); | |
1983 | if (!NILP (XPROCESS (proc)->raw_status_low)) | |
1984 | update_status (XPROCESS (proc)); | |
1985 | if (EQ (XPROCESS (proc)->status, Qrun)) | |
1986 | XPROCESS (proc)->status | |
1987 | = Fcons (Qexit, Fcons (make_number (256), Qnil)); | |
1988 | } | |
1989 | } | |
ffd56f97 JB |
1990 | } /* end for each file descriptor */ |
1991 | } /* end while exit conditions not met */ | |
d0d6b7c5 | 1992 | |
ffd56f97 JB |
1993 | /* If calling from keyboard input, do not quit |
1994 | since we want to return C-g as an input character. | |
1995 | Otherwise, do pending quit if requested. */ | |
f76475ad | 1996 | if (XINT (read_kbd) >= 0) |
ffd56f97 JB |
1997 | { |
1998 | /* Prevent input_pending from remaining set if we quit. */ | |
1999 | clear_input_pending (); | |
2000 | QUIT; | |
2001 | } | |
d0d6b7c5 JB |
2002 | |
2003 | return got_some_input; | |
2004 | } | |
2005 | \f | |
2006 | /* Read pending output from the process channel, | |
2007 | starting with our buffered-ahead character if we have one. | |
2008 | Yield number of characters read. | |
2009 | ||
2010 | This function reads at most 1024 characters. | |
2011 | If you want to read all available subprocess output, | |
2012 | you must call it repeatedly until it returns zero. */ | |
2013 | ||
2014 | read_process_output (proc, channel) | |
2015 | Lisp_Object proc; | |
2016 | register int channel; | |
2017 | { | |
2018 | register int nchars; | |
2019 | #ifdef VMS | |
2020 | char *chars; | |
2021 | #else | |
2022 | char chars[1024]; | |
2023 | #endif | |
2024 | register Lisp_Object outstream; | |
2025 | register struct buffer *old = current_buffer; | |
2026 | register struct Lisp_Process *p = XPROCESS (proc); | |
2027 | register int opoint; | |
2028 | ||
2029 | #ifdef VMS | |
2030 | VMS_PROC_STUFF *vs, *get_vms_process_pointer(); | |
2031 | ||
2032 | vs = get_vms_process_pointer (p->pid); | |
2033 | if (vs) | |
2034 | { | |
2035 | if (!vs->iosb[0]) | |
2036 | return(0); /* Really weird if it does this */ | |
2037 | if (!(vs->iosb[0] & 1)) | |
2038 | return -1; /* I/O error */ | |
2039 | } | |
2040 | else | |
2041 | error ("Could not get VMS process pointer"); | |
2042 | chars = vs->inputBuffer; | |
2043 | nchars = clean_vms_buffer (chars, vs->iosb[1]); | |
2044 | if (nchars <= 0) | |
2045 | { | |
2046 | start_vms_process_read (vs); /* Crank up the next read on the process */ | |
2047 | return 1; /* Nothing worth printing, say we got 1 */ | |
2048 | } | |
2049 | #else /* not VMS */ | |
2050 | ||
2051 | if (proc_buffered_char[channel] < 0) | |
2052 | nchars = read (channel, chars, sizeof chars); | |
2053 | else | |
2054 | { | |
2055 | chars[0] = proc_buffered_char[channel]; | |
2056 | proc_buffered_char[channel] = -1; | |
2057 | nchars = read (channel, chars + 1, sizeof chars - 1); | |
2058 | if (nchars < 0) | |
2059 | nchars = 1; | |
2060 | else | |
2061 | nchars = nchars + 1; | |
2062 | } | |
2063 | #endif /* not VMS */ | |
2064 | ||
2065 | if (nchars <= 0) return nchars; | |
2066 | ||
2067 | outstream = p->filter; | |
2068 | if (!NILP (outstream)) | |
2069 | { | |
2070 | /* We inhibit quit here instead of just catching it so that | |
2071 | hitting ^G when a filter happens to be running won't screw | |
2072 | it up. */ | |
2073 | int count = specpdl_ptr - specpdl; | |
2074 | specbind (Qinhibit_quit, Qt); | |
2075 | call2 (outstream, proc, make_string (chars, nchars)); | |
2076 | ||
2077 | #ifdef VMS | |
2078 | start_vms_process_read (vs); | |
2079 | #endif | |
2080 | unbind_to (count); | |
2081 | return nchars; | |
2082 | } | |
2083 | ||
2084 | /* If no filter, write into buffer if it isn't dead. */ | |
2085 | if (!NILP (p->buffer) && !NILP (XBUFFER (p->buffer)->name)) | |
2086 | { | |
b0310da4 JB |
2087 | Lisp_Object old_read_only; |
2088 | Lisp_Object old_begv, old_zv; | |
d0d6b7c5 JB |
2089 | |
2090 | Fset_buffer (p->buffer); | |
2091 | opoint = point; | |
b0310da4 JB |
2092 | old_read_only = current_buffer->read_only; |
2093 | XFASTINT (old_begv) = BEGV; | |
2094 | XFASTINT (old_zv) = ZV; | |
2095 | ||
2096 | current_buffer->read_only = Qnil; | |
d0d6b7c5 JB |
2097 | |
2098 | /* Insert new output into buffer | |
2099 | at the current end-of-output marker, | |
2100 | thus preserving logical ordering of input and output. */ | |
2101 | if (XMARKER (p->mark)->buffer) | |
2102 | SET_PT (marker_position (p->mark)); | |
2103 | else | |
2104 | SET_PT (ZV); | |
b0310da4 JB |
2105 | |
2106 | /* If the output marker is outside of the visible region, save | |
2107 | the restriction and widen. */ | |
2108 | if (! (BEGV <= point && point <= ZV)) | |
2109 | Fwiden (); | |
2110 | ||
2111 | /* Make sure opoint floats ahead of any new text, just as point | |
2112 | would. */ | |
d0d6b7c5 JB |
2113 | if (point <= opoint) |
2114 | opoint += nchars; | |
2115 | ||
b0310da4 JB |
2116 | /* Insert after old_begv, but before old_zv. */ |
2117 | if (point < XFASTINT (old_begv)) | |
2118 | XFASTINT (old_begv) += nchars; | |
2119 | if (point <= XFASTINT (old_zv)) | |
2120 | XFASTINT (old_zv) += nchars; | |
2121 | ||
d0d6b7c5 JB |
2122 | /* Insert before markers in case we are inserting where |
2123 | the buffer's mark is, and the user's next command is Meta-y. */ | |
2124 | insert_before_markers (chars, nchars); | |
d0d6b7c5 | 2125 | Fset_marker (p->mark, make_number (point), p->buffer); |
b0310da4 | 2126 | |
d0d6b7c5 JB |
2127 | update_mode_lines++; |
2128 | ||
b0310da4 JB |
2129 | /* If the restriction isn't what it should be, set it. */ |
2130 | if (XFASTINT (old_begv) != BEGV || XFASTINT (old_zv) != ZV) | |
2131 | Fnarrow_to_region (old_begv, old_zv); | |
2132 | ||
2133 | current_buffer->read_only = old_read_only; | |
d0d6b7c5 JB |
2134 | SET_PT (opoint); |
2135 | set_buffer_internal (old); | |
2136 | } | |
2137 | #ifdef VMS | |
2138 | start_vms_process_read (vs); | |
2139 | #endif | |
2140 | return nchars; | |
2141 | } | |
2142 | ||
2143 | DEFUN ("waiting-for-user-input-p", Fwaiting_for_user_input_p, Swaiting_for_user_input_p, | |
2144 | 0, 0, 0, | |
2145 | "Returns non-NIL if emacs is waiting for input from the user.\n\ | |
2146 | This is intended for use by asynchronous process output filters and sentinels.") | |
2147 | () | |
2148 | { | |
2149 | return ((waiting_for_user_input_p) ? Qt : Qnil); | |
2150 | } | |
2151 | \f | |
2152 | /* Sending data to subprocess */ | |
2153 | ||
2154 | jmp_buf send_process_frame; | |
2155 | ||
2156 | SIGTYPE | |
2157 | send_process_trap () | |
2158 | { | |
2159 | #ifdef BSD4_1 | |
2160 | sigrelse (SIGPIPE); | |
2161 | sigrelse (SIGALRM); | |
2162 | #endif /* BSD4_1 */ | |
2163 | longjmp (send_process_frame, 1); | |
2164 | } | |
2165 | ||
2166 | send_process (proc, buf, len) | |
2167 | Lisp_Object proc; | |
2168 | char *buf; | |
2169 | int len; | |
2170 | { | |
2171 | /* Don't use register vars; longjmp can lose them. */ | |
2172 | int rv; | |
2173 | unsigned char *procname = XSTRING (XPROCESS (proc)->name)->data; | |
2174 | ||
2175 | ||
2176 | #ifdef VMS | |
2177 | struct Lisp_Process *p = XPROCESS (proc); | |
2178 | VMS_PROC_STUFF *vs, *get_vms_process_pointer(); | |
2179 | #endif /* VMS */ | |
2180 | ||
2181 | if (! NILP (XPROCESS (proc)->raw_status_low)) | |
2182 | update_status (XPROCESS (proc)); | |
2183 | if (! EQ (XPROCESS (proc)->status, Qrun)) | |
2184 | error ("Process %s not running", procname); | |
2185 | ||
2186 | #ifdef VMS | |
2187 | vs = get_vms_process_pointer (p->pid); | |
2188 | if (vs == 0) | |
2189 | error ("Could not find this process: %x", p->pid); | |
2190 | else if (write_to_vms_process (vs, buf, len)) | |
2191 | ; | |
2192 | #else | |
2193 | if (!setjmp (send_process_frame)) | |
2194 | while (len > 0) | |
2195 | { | |
2196 | int this = len; | |
4746118a JB |
2197 | SIGTYPE (*old_sigpipe)(); |
2198 | ||
d0d6b7c5 JB |
2199 | /* Don't send more than 500 bytes at a time. */ |
2200 | if (this > 500) | |
2201 | this = 500; | |
508b171c | 2202 | old_sigpipe = (SIGTYPE (*) ()) signal (SIGPIPE, send_process_trap); |
d0d6b7c5 | 2203 | rv = write (XFASTINT (XPROCESS (proc)->outfd), buf, this); |
4746118a | 2204 | signal (SIGPIPE, old_sigpipe); |
d0d6b7c5 JB |
2205 | if (rv < 0) |
2206 | { | |
2207 | if (0 | |
2208 | #ifdef EWOULDBLOCK | |
2209 | || errno == EWOULDBLOCK | |
2210 | #endif | |
2211 | #ifdef EAGAIN | |
2212 | || errno == EAGAIN | |
2213 | #endif | |
2214 | ) | |
2215 | { | |
2216 | /* It would be nice to accept process output here, | |
2217 | but that is difficult. For example, it could | |
2218 | garbage what we are sending if that is from a buffer. */ | |
2219 | immediate_quit = 1; | |
2220 | QUIT; | |
2221 | sleep (1); | |
2222 | immediate_quit = 0; | |
2223 | continue; | |
2224 | } | |
2225 | report_file_error ("writing to process", Fcons (proc, Qnil)); | |
2226 | } | |
2227 | buf += rv; | |
2228 | len -= rv; | |
2229 | /* Allow input from processes between bursts of sending. | |
2230 | Otherwise things may get stopped up. */ | |
2231 | if (len > 0) | |
f76475ad JB |
2232 | { |
2233 | Lisp_Object zero; | |
2234 | ||
2235 | XFASTINT (zero) = 0; | |
2236 | wait_reading_process_input (-1, 0, zero, 0); | |
2237 | } | |
d0d6b7c5 JB |
2238 | } |
2239 | #endif | |
2240 | else | |
2241 | { | |
2242 | XPROCESS (proc)->raw_status_low = Qnil; | |
2243 | XPROCESS (proc)->raw_status_high = Qnil; | |
2244 | XPROCESS (proc)->status = Fcons (Qexit, Fcons (make_number (256), Qnil)); | |
2245 | XSETINT (XPROCESS (proc)->tick, ++process_tick); | |
2246 | deactivate_process (proc); | |
2247 | #ifdef VMS | |
2248 | error ("Error writing to process %s; closed it", procname); | |
2249 | #else | |
2250 | error ("SIGPIPE raised on process %s; closed it", procname); | |
2251 | #endif | |
2252 | } | |
2253 | } | |
2254 | ||
2255 | DEFUN ("process-send-region", Fprocess_send_region, Sprocess_send_region, | |
2256 | 3, 3, 0, | |
2257 | "Send current contents of region as input to PROCESS.\n\ | |
ebb9e16f JB |
2258 | PROCESS may be a process, a buffer, the name of a process or buffer, or\n\ |
2259 | nil, indicating the current buffer's process.\n\ | |
d0d6b7c5 JB |
2260 | Called from program, takes three arguments, PROCESS, START and END.\n\ |
2261 | If the region is more than 500 characters long,\n\ | |
2262 | it is sent in several bunches. This may happen even for shorter regions.\n\ | |
2263 | Output from processes can arrive in between bunches.") | |
2264 | (process, start, end) | |
2265 | Lisp_Object process, start, end; | |
2266 | { | |
2267 | Lisp_Object proc; | |
2268 | int start1; | |
2269 | ||
2270 | proc = get_process (process); | |
2271 | validate_region (&start, &end); | |
2272 | ||
2273 | if (XINT (start) < GPT && XINT (end) > GPT) | |
2274 | move_gap (start); | |
2275 | ||
2276 | start1 = XINT (start); | |
2277 | send_process (proc, &FETCH_CHAR (start1), XINT (end) - XINT (start)); | |
2278 | ||
2279 | return Qnil; | |
2280 | } | |
2281 | ||
2282 | DEFUN ("process-send-string", Fprocess_send_string, Sprocess_send_string, | |
2283 | 2, 2, 0, | |
2284 | "Send PROCESS the contents of STRING as input.\n\ | |
ebb9e16f JB |
2285 | PROCESS may be a process, a buffer, the name of a process or buffer, or\n\ |
2286 | nil, indicating the current buffer's process.\n\ | |
d0d6b7c5 JB |
2287 | If STRING is more than 500 characters long,\n\ |
2288 | it is sent in several bunches. This may happen even for shorter strings.\n\ | |
2289 | Output from processes can arrive in between bunches.") | |
2290 | (process, string) | |
2291 | Lisp_Object process, string; | |
2292 | { | |
2293 | Lisp_Object proc; | |
2294 | CHECK_STRING (string, 1); | |
2295 | proc = get_process (process); | |
2296 | send_process (proc, XSTRING (string)->data, XSTRING (string)->size); | |
2297 | return Qnil; | |
2298 | } | |
2299 | \f | |
2300 | /* send a signal number SIGNO to PROCESS. | |
2301 | CURRENT_GROUP means send to the process group that currently owns | |
2302 | the terminal being used to communicate with PROCESS. | |
2303 | This is used for various commands in shell mode. | |
2304 | If NOMSG is zero, insert signal-announcements into process's buffers | |
b0310da4 JB |
2305 | right away. |
2306 | ||
2307 | If we can, we try to signal PROCESS by sending control characters | |
2308 | down the pipe. This allows us to signal inferiors who have changed | |
2309 | their uid, for which killpg would return an EPERM error. */ | |
d0d6b7c5 | 2310 | |
f9738840 | 2311 | static void |
d0d6b7c5 JB |
2312 | process_send_signal (process, signo, current_group, nomsg) |
2313 | Lisp_Object process; | |
2314 | int signo; | |
2315 | Lisp_Object current_group; | |
2316 | int nomsg; | |
2317 | { | |
2318 | Lisp_Object proc; | |
2319 | register struct Lisp_Process *p; | |
2320 | int gid; | |
2321 | int no_pgrp = 0; | |
2322 | ||
2323 | proc = get_process (process); | |
2324 | p = XPROCESS (proc); | |
2325 | ||
2326 | if (!EQ (p->childp, Qt)) | |
2327 | error ("Process %s is not a subprocess", | |
2328 | XSTRING (p->name)->data); | |
2329 | if (!XFASTINT (p->infd)) | |
2330 | error ("Process %s is not active", | |
2331 | XSTRING (p->name)->data); | |
2332 | ||
2333 | if (NILP (p->pty_flag)) | |
2334 | current_group = Qnil; | |
2335 | ||
d0d6b7c5 JB |
2336 | /* If we are using pgrps, get a pgrp number and make it negative. */ |
2337 | if (!NILP (current_group)) | |
2338 | { | |
b0310da4 | 2339 | #ifdef SIGNALS_VIA_CHARACTERS |
d0d6b7c5 JB |
2340 | /* If possible, send signals to the entire pgrp |
2341 | by sending an input character to it. */ | |
b0310da4 | 2342 | |
6be429b1 JB |
2343 | /* TERMIOS is the latest and bestest, and seems most likely to |
2344 | work. If the system has it, use it. */ | |
2345 | #ifdef HAVE_TERMIOS | |
2346 | struct termios t; | |
2347 | ||
2348 | switch (signo) | |
2349 | { | |
2350 | case SIGINT: | |
2351 | tcgetattr (XFASTINT (p->infd), &t); | |
2352 | send_process (proc, &t.c_cc[VINTR], 1); | |
a87b802f | 2353 | return; |
6be429b1 JB |
2354 | |
2355 | case SIGQUIT: | |
2356 | tcgetattr (XFASTINT (p->infd), &t); | |
2357 | send_process (proc, &t.c_cc[VQUIT], 1); | |
a87b802f | 2358 | return; |
6be429b1 JB |
2359 | |
2360 | case SIGTSTP: | |
2361 | tcgetattr (XFASTINT (p->infd), &t); | |
2362 | #ifdef VSWTCH | |
2363 | send_process (proc, &t.c_cc[VSWTCH], 1); | |
2364 | #else | |
2365 | send_process (proc, &t.c_cc[VSUSP], 1); | |
2366 | #endif | |
a87b802f | 2367 | return; |
6be429b1 JB |
2368 | } |
2369 | ||
2370 | #else /* ! HAVE_TERMIOS */ | |
2371 | ||
b0310da4 JB |
2372 | /* On Berkeley descendants, the following IOCTL's retrieve the |
2373 | current control characters. */ | |
d0d6b7c5 | 2374 | #if defined (TIOCGLTC) && defined (TIOCGETC) |
b0310da4 | 2375 | |
d0d6b7c5 JB |
2376 | struct tchars c; |
2377 | struct ltchars lc; | |
2378 | ||
2379 | switch (signo) | |
2380 | { | |
2381 | case SIGINT: | |
2382 | ioctl (XFASTINT (p->infd), TIOCGETC, &c); | |
2383 | send_process (proc, &c.t_intrc, 1); | |
f9738840 | 2384 | return; |
d0d6b7c5 JB |
2385 | case SIGQUIT: |
2386 | ioctl (XFASTINT (p->infd), TIOCGETC, &c); | |
2387 | send_process (proc, &c.t_quitc, 1); | |
f9738840 | 2388 | return; |
0ad77c54 | 2389 | #ifdef SIGTSTP |
d0d6b7c5 JB |
2390 | case SIGTSTP: |
2391 | ioctl (XFASTINT (p->infd), TIOCGLTC, &lc); | |
2392 | send_process (proc, &lc.t_suspc, 1); | |
f9738840 | 2393 | return; |
b0310da4 | 2394 | #endif /* ! defined (SIGTSTP) */ |
d0d6b7c5 | 2395 | } |
b0310da4 JB |
2396 | |
2397 | #else /* ! defined (TIOCGLTC) && defined (TIOCGETC) */ | |
2398 | ||
2399 | /* On SYSV descendants, the TCGETA ioctl retrieves the current control | |
2400 | characters. */ | |
2401 | #ifdef TCGETA | |
d0d6b7c5 JB |
2402 | struct termio t; |
2403 | switch (signo) | |
2404 | { | |
2405 | case SIGINT: | |
2406 | ioctl (XFASTINT (p->infd), TCGETA, &t); | |
2407 | send_process (proc, &t.c_cc[VINTR], 1); | |
f9738840 | 2408 | return; |
d0d6b7c5 JB |
2409 | case SIGQUIT: |
2410 | ioctl (XFASTINT (p->infd), TCGETA, &t); | |
2411 | send_process (proc, &t.c_cc[VQUIT], 1); | |
f9738840 | 2412 | return; |
7d79e3b4 | 2413 | #ifdef SIGTSTP |
d0d6b7c5 JB |
2414 | case SIGTSTP: |
2415 | ioctl (XFASTINT (p->infd), TCGETA, &t); | |
2416 | send_process (proc, &t.c_cc[VSWTCH], 1); | |
f9738840 | 2417 | return; |
b0310da4 | 2418 | #endif /* ! defined (SIGTSTP) */ |
d0d6b7c5 | 2419 | } |
b0310da4 JB |
2420 | #else /* ! defined (TCGETA) */ |
2421 | Your configuration files are messed up. | |
2422 | /* If your system configuration files define SIGNALS_VIA_CHARACTERS, | |
2423 | you'd better be using one of the alternatives above! */ | |
2424 | #endif /* ! defined (TCGETA) */ | |
2425 | #endif /* ! defined (TIOCGLTC) && defined (TIOCGETC) */ | |
6be429b1 | 2426 | #endif /* ! defined HAVE_TERMIOS */ |
b0310da4 | 2427 | #endif /* ! defined (SIGNALS_VIA_CHARACTERS) */ |
d0d6b7c5 | 2428 | |
301c3fe4 | 2429 | #ifdef TIOCGPGRP |
d0d6b7c5 JB |
2430 | /* Get the pgrp using the tty itself, if we have that. |
2431 | Otherwise, use the pty to get the pgrp. | |
2432 | On pfa systems, saka@pfu.fujitsu.co.JP writes: | |
b0310da4 JB |
2433 | "TIOCGPGRP symbol defined in sys/ioctl.h at E50. |
2434 | But, TIOCGPGRP does not work on E50 ;-P works fine on E60" | |
d0d6b7c5 JB |
2435 | His patch indicates that if TIOCGPGRP returns an error, then |
2436 | we should just assume that p->pid is also the process group id. */ | |
2437 | { | |
2438 | int err; | |
2439 | ||
2440 | if (!NILP (p->subtty)) | |
2441 | err = ioctl (XFASTINT (p->subtty), TIOCGPGRP, &gid); | |
2442 | else | |
2443 | err = ioctl (XFASTINT (p->infd), TIOCGPGRP, &gid); | |
2444 | ||
2445 | #ifdef pfa | |
2446 | if (err == -1) | |
2447 | gid = - XFASTINT (p->pid); | |
301c3fe4 | 2448 | #endif /* ! defined (pfa) */ |
d0d6b7c5 JB |
2449 | } |
2450 | if (gid == -1) | |
2451 | no_pgrp = 1; | |
2452 | else | |
2453 | gid = - gid; | |
b0310da4 | 2454 | #else /* ! defined (TIOCGPGRP ) */ |
301c3fe4 JB |
2455 | /* Can't select pgrps on this system, so we know that |
2456 | the child itself heads the pgrp. */ | |
2457 | gid = - XFASTINT (p->pid); | |
2458 | #endif /* ! defined (TIOCGPGRP ) */ | |
d0d6b7c5 JB |
2459 | } |
2460 | else | |
2461 | gid = - XFASTINT (p->pid); | |
d0d6b7c5 JB |
2462 | |
2463 | switch (signo) | |
2464 | { | |
2465 | #ifdef SIGCONT | |
2466 | case SIGCONT: | |
2467 | p->raw_status_low = Qnil; | |
2468 | p->raw_status_high = Qnil; | |
2469 | p->status = Qrun; | |
2470 | XSETINT (p->tick, ++process_tick); | |
2471 | if (!nomsg) | |
2472 | status_notify (); | |
2473 | break; | |
301c3fe4 | 2474 | #endif /* ! defined (SIGCONT) */ |
d0d6b7c5 JB |
2475 | case SIGINT: |
2476 | #ifdef VMS | |
2477 | send_process (proc, "\003", 1); /* ^C */ | |
2478 | goto whoosh; | |
2479 | #endif | |
2480 | case SIGQUIT: | |
2481 | #ifdef VMS | |
2482 | send_process (proc, "\031", 1); /* ^Y */ | |
2483 | goto whoosh; | |
2484 | #endif | |
2485 | case SIGKILL: | |
2486 | #ifdef VMS | |
2487 | sys$forcex (&(XFASTINT (p->pid)), 0, 1); | |
2488 | whoosh: | |
2489 | #endif | |
2490 | flush_pending_output (XFASTINT (p->infd)); | |
2491 | break; | |
2492 | } | |
2493 | ||
2494 | /* If we don't have process groups, send the signal to the immediate | |
2495 | subprocess. That isn't really right, but it's better than any | |
2496 | obvious alternative. */ | |
2497 | if (no_pgrp) | |
2498 | { | |
2499 | kill (XFASTINT (p->pid), signo); | |
2500 | return; | |
2501 | } | |
2502 | ||
2503 | /* gid may be a pid, or minus a pgrp's number */ | |
2504 | #ifdef TIOCSIGSEND | |
2505 | if (!NILP (current_group)) | |
2506 | ioctl (XFASTINT (p->infd), TIOCSIGSEND, signo); | |
2507 | else | |
2508 | { | |
2509 | gid = - XFASTINT (p->pid); | |
2510 | kill (gid, signo); | |
2511 | } | |
301c3fe4 | 2512 | #else /* ! defined (TIOCSIGSEND) */ |
d0d6b7c5 | 2513 | EMACS_KILLPG (-gid, signo); |
301c3fe4 | 2514 | #endif /* ! defined (TIOCSIGSEND) */ |
d0d6b7c5 JB |
2515 | } |
2516 | ||
2517 | DEFUN ("interrupt-process", Finterrupt_process, Sinterrupt_process, 0, 2, 0, | |
2518 | "Interrupt process PROCESS. May be process or name of one.\n\ | |
ebb9e16f | 2519 | PROCESS may be a process, a buffer, or the name of a process or buffer.\n\ |
d0d6b7c5 JB |
2520 | Nil or no arg means current buffer's process.\n\ |
2521 | Second arg CURRENT-GROUP non-nil means send signal to\n\ | |
2522 | the current process-group of the process's controlling terminal\n\ | |
2523 | rather than to the process's own process group.\n\ | |
2524 | If the process is a shell, this means interrupt current subjob\n\ | |
2525 | rather than the shell.") | |
2526 | (process, current_group) | |
2527 | Lisp_Object process, current_group; | |
2528 | { | |
2529 | process_send_signal (process, SIGINT, current_group, 0); | |
2530 | return process; | |
2531 | } | |
2532 | ||
2533 | DEFUN ("kill-process", Fkill_process, Skill_process, 0, 2, 0, | |
2534 | "Kill process PROCESS. May be process or name of one.\n\ | |
2535 | See function `interrupt-process' for more details on usage.") | |
2536 | (process, current_group) | |
2537 | Lisp_Object process, current_group; | |
2538 | { | |
2539 | process_send_signal (process, SIGKILL, current_group, 0); | |
2540 | return process; | |
2541 | } | |
2542 | ||
2543 | DEFUN ("quit-process", Fquit_process, Squit_process, 0, 2, 0, | |
2544 | "Send QUIT signal to process PROCESS. May be process or name of one.\n\ | |
2545 | See function `interrupt-process' for more details on usage.") | |
2546 | (process, current_group) | |
2547 | Lisp_Object process, current_group; | |
2548 | { | |
2549 | process_send_signal (process, SIGQUIT, current_group, 0); | |
2550 | return process; | |
2551 | } | |
2552 | ||
2553 | DEFUN ("stop-process", Fstop_process, Sstop_process, 0, 2, 0, | |
2554 | "Stop process PROCESS. May be process or name of one.\n\ | |
2555 | See function `interrupt-process' for more details on usage.") | |
2556 | (process, current_group) | |
2557 | Lisp_Object process, current_group; | |
2558 | { | |
2559 | #ifndef SIGTSTP | |
2560 | error ("no SIGTSTP support"); | |
2561 | #else | |
2562 | process_send_signal (process, SIGTSTP, current_group, 0); | |
2563 | #endif | |
2564 | return process; | |
2565 | } | |
2566 | ||
2567 | DEFUN ("continue-process", Fcontinue_process, Scontinue_process, 0, 2, 0, | |
2568 | "Continue process PROCESS. May be process or name of one.\n\ | |
2569 | See function `interrupt-process' for more details on usage.") | |
2570 | (process, current_group) | |
2571 | Lisp_Object process, current_group; | |
2572 | { | |
2573 | #ifdef SIGCONT | |
2574 | process_send_signal (process, SIGCONT, current_group, 0); | |
2575 | #else | |
2576 | error ("no SIGCONT support"); | |
2577 | #endif | |
2578 | return process; | |
2579 | } | |
2580 | ||
2581 | DEFUN ("signal-process", Fsignal_process, Ssignal_process, | |
2582 | 2, 2, "nProcess number: \nnSignal code: ", | |
2583 | "Send the process with number PID the signal with code CODE.\n\ | |
2584 | Both PID and CODE are integers.") | |
2585 | (pid, sig) | |
2586 | Lisp_Object pid, sig; | |
2587 | { | |
2588 | CHECK_NUMBER (pid, 0); | |
2589 | CHECK_NUMBER (sig, 1); | |
2590 | return make_number (kill (XINT (pid), XINT (sig))); | |
2591 | } | |
2592 | ||
2593 | DEFUN ("process-send-eof", Fprocess_send_eof, Sprocess_send_eof, 0, 1, 0, | |
2594 | "Make PROCESS see end-of-file in its input.\n\ | |
2595 | Eof comes after any text already sent to it.\n\ | |
ebb9e16f JB |
2596 | PROCESS may be a process, a buffer, the name of a process or buffer, or\n\ |
2597 | nil, indicating the current buffer's process.") | |
d0d6b7c5 JB |
2598 | (process) |
2599 | Lisp_Object process; | |
2600 | { | |
2601 | Lisp_Object proc; | |
2602 | ||
2603 | proc = get_process (process); | |
577d03d5 RS |
2604 | |
2605 | /* Make sure the process is really alive. */ | |
2606 | if (! NILP (XPROCESS (proc)->raw_status_low)) | |
2607 | update_status (XPROCESS (proc)); | |
2608 | if (! EQ (XPROCESS (proc)->status, Qrun)) | |
dcf970e6 | 2609 | error ("Process %s not running", XSTRING (XPROCESS (proc)->name)->data); |
577d03d5 | 2610 | |
d0d6b7c5 JB |
2611 | /* Sending a zero-length record is supposed to mean eof |
2612 | when TIOCREMOTE is turned on. */ | |
2613 | #ifdef DID_REMOTE | |
2614 | { | |
2615 | char buf[1]; | |
2616 | write (XFASTINT (XPROCESS (proc)->outfd), buf, 0); | |
2617 | } | |
2618 | #else /* did not do TOICREMOTE */ | |
2619 | #ifdef VMS | |
2620 | send_process (proc, "\032", 1); /* ^z */ | |
2621 | #else | |
2622 | if (!NILP (XPROCESS (proc)->pty_flag)) | |
2623 | send_process (proc, "\004", 1); | |
2624 | else | |
2625 | { | |
2626 | close (XPROCESS (proc)->outfd); | |
5437e9f9 | 2627 | XFASTINT (XPROCESS (proc)->outfd) = open (NULL_DEVICE, O_WRONLY); |
d0d6b7c5 JB |
2628 | } |
2629 | #endif /* VMS */ | |
2630 | #endif /* did not do TOICREMOTE */ | |
2631 | return process; | |
2632 | } | |
2633 | ||
2634 | /* Kill all processes associated with `buffer'. | |
2635 | If `buffer' is nil, kill all processes */ | |
2636 | ||
2637 | kill_buffer_processes (buffer) | |
2638 | Lisp_Object buffer; | |
2639 | { | |
2640 | Lisp_Object tail, proc; | |
2641 | ||
2642 | for (tail = Vprocess_alist; XGCTYPE (tail) == Lisp_Cons; | |
2643 | tail = XCONS (tail)->cdr) | |
2644 | { | |
2645 | proc = XCONS (XCONS (tail)->car)->cdr; | |
2646 | if (XGCTYPE (proc) == Lisp_Process | |
2647 | && (NILP (buffer) || EQ (XPROCESS (proc)->buffer, buffer))) | |
2648 | { | |
2649 | if (NETCONN_P (proc)) | |
2650 | deactivate_process (proc); | |
2651 | else if (XFASTINT (XPROCESS (proc)->infd)) | |
2652 | process_send_signal (proc, SIGHUP, Qnil, 1); | |
2653 | } | |
2654 | } | |
2655 | } | |
2656 | \f | |
2657 | /* On receipt of a signal that a child status has changed, | |
2658 | loop asking about children with changed statuses until | |
2659 | the system says there are no more. | |
2660 | All we do is change the status; | |
2661 | we do not run sentinels or print notifications. | |
2662 | That is saved for the next time keyboard input is done, | |
2663 | in order to avoid timing errors. */ | |
2664 | ||
2665 | /** WARNING: this can be called during garbage collection. | |
2666 | Therefore, it must not be fooled by the presence of mark bits in | |
2667 | Lisp objects. */ | |
2668 | ||
2669 | /** USG WARNING: Although it is not obvious from the documentation | |
2670 | in signal(2), on a USG system the SIGCLD handler MUST NOT call | |
2671 | signal() before executing at least one wait(), otherwise the handler | |
2672 | will be called again, resulting in an infinite loop. The relevant | |
2673 | portion of the documentation reads "SIGCLD signals will be queued | |
2674 | and the signal-catching function will be continually reentered until | |
2675 | the queue is empty". Invoking signal() causes the kernel to reexamine | |
2676 | the SIGCLD queue. Fred Fish, UniSoft Systems Inc. */ | |
2677 | ||
2678 | SIGTYPE | |
2679 | sigchld_handler (signo) | |
2680 | int signo; | |
2681 | { | |
2682 | int old_errno = errno; | |
2683 | Lisp_Object proc; | |
2684 | register struct Lisp_Process *p; | |
6be429b1 | 2685 | extern EMACS_TIME *input_available_clear_time; |
d0d6b7c5 JB |
2686 | |
2687 | #ifdef BSD4_1 | |
2688 | extern int sigheld; | |
2689 | sigheld |= sigbit (SIGCHLD); | |
2690 | #endif | |
2691 | ||
2692 | while (1) | |
2693 | { | |
2694 | register int pid; | |
2695 | WAITTYPE w; | |
2696 | Lisp_Object tail; | |
2697 | ||
2698 | #ifdef WNOHANG | |
2699 | #ifndef WUNTRACED | |
2700 | #define WUNTRACED 0 | |
2701 | #endif /* no WUNTRACED */ | |
2702 | /* Keep trying to get a status until we get a definitive result. */ | |
2703 | do | |
2704 | { | |
2705 | errno = 0; | |
2706 | pid = wait3 (&w, WNOHANG | WUNTRACED, 0); | |
2707 | } | |
2708 | while (pid <= 0 && errno == EINTR); | |
2709 | ||
2710 | if (pid <= 0) | |
2711 | { | |
2712 | /* A real failure. We have done all our job, so return. */ | |
2713 | ||
2714 | /* USG systems forget handlers when they are used; | |
2715 | must reestablish each time */ | |
2716 | #ifdef USG | |
2717 | signal (signo, sigchld_handler); /* WARNING - must come after wait3() */ | |
2718 | #endif | |
2719 | #ifdef BSD4_1 | |
2720 | sigheld &= ~sigbit (SIGCHLD); | |
2721 | sigrelse (SIGCHLD); | |
2722 | #endif | |
2723 | errno = old_errno; | |
2724 | return; | |
2725 | } | |
2726 | #else | |
2727 | pid = wait (&w); | |
2728 | #endif /* no WNOHANG */ | |
2729 | ||
2730 | /* Find the process that signaled us, and record its status. */ | |
2731 | ||
2732 | p = 0; | |
2733 | for (tail = Vprocess_alist; XSYMBOL (tail) != XSYMBOL (Qnil); tail = XCONS (tail)->cdr) | |
2734 | { | |
2735 | proc = XCONS (XCONS (tail)->car)->cdr; | |
2736 | p = XPROCESS (proc); | |
2737 | if (EQ (p->childp, Qt) && XFASTINT (p->pid) == pid) | |
2738 | break; | |
2739 | p = 0; | |
2740 | } | |
2741 | ||
2742 | /* Look for an asynchronous process whose pid hasn't been filled | |
2743 | in yet. */ | |
2744 | if (p == 0) | |
2745 | for (tail = Vprocess_alist; XSYMBOL (tail) != XSYMBOL (Qnil); tail = XCONS (tail)->cdr) | |
2746 | { | |
2747 | proc = XCONS (XCONS (tail)->car)->cdr; | |
2748 | p = XPROCESS (proc); | |
2749 | if (XTYPE (p->pid) == Lisp_Int && XINT (p->pid) == -1) | |
2750 | break; | |
2751 | p = 0; | |
2752 | } | |
2753 | ||
2754 | /* Change the status of the process that was found. */ | |
2755 | if (p != 0) | |
2756 | { | |
2757 | union { int i; WAITTYPE wt; } u; | |
2758 | ||
2759 | XSETINT (p->tick, ++process_tick); | |
2760 | u.wt = w; | |
2761 | XFASTINT (p->raw_status_low) = u.i & 0xffff; | |
2762 | XFASTINT (p->raw_status_high) = u.i >> 16; | |
2763 | ||
2764 | /* If process has terminated, stop waiting for its output. */ | |
2765 | if (WIFSIGNALED (w) || WIFEXITED (w)) | |
f9738840 JB |
2766 | if (XFASTINT (p->infd)) |
2767 | FD_CLR (XFASTINT (p->infd), &input_wait_mask); | |
6be429b1 JB |
2768 | |
2769 | /* Tell wait_reading_process_input that it needs to wake up and | |
2770 | look around. */ | |
2771 | if (input_available_clear_time) | |
2772 | EMACS_SET_SECS_USECS (*input_available_clear_time, 0, 0); | |
d0d6b7c5 JB |
2773 | } |
2774 | ||
2775 | /* There was no asynchronous process found for that id. Check | |
2776 | if we have a synchronous process. */ | |
2777 | else | |
2778 | { | |
2779 | synch_process_alive = 0; | |
2780 | ||
2781 | /* Report the status of the synchronous process. */ | |
2782 | if (WIFEXITED (w)) | |
2783 | synch_process_retcode = WRETCODE (w); | |
2784 | else if (WIFSIGNALED (w)) | |
b0310da4 | 2785 | #ifndef VMS |
d0d6b7c5 | 2786 | synch_process_death = sys_siglist[WTERMSIG (w)]; |
b0310da4 JB |
2787 | #else |
2788 | synch_process_death = sys_errlist[WTERMSIG (w)]; | |
2789 | #endif | |
6be429b1 JB |
2790 | |
2791 | /* Tell wait_reading_process_input that it needs to wake up and | |
2792 | look around. */ | |
2793 | if (input_available_clear_time) | |
2794 | EMACS_SET_SECS_USECS (*input_available_clear_time, 0, 0); | |
d0d6b7c5 JB |
2795 | } |
2796 | ||
2797 | /* On some systems, we must return right away. | |
2798 | If any more processes want to signal us, we will | |
2799 | get another signal. | |
2800 | Otherwise (on systems that have WNOHANG), loop around | |
2801 | to use up all the processes that have something to tell us. */ | |
2802 | #if defined (USG) && ! (defined (HPUX) && defined (WNOHANG)) | |
2803 | #ifdef USG | |
2804 | signal (signo, sigchld_handler); | |
2805 | #endif | |
2806 | errno = old_errno; | |
2807 | return; | |
2808 | #endif /* USG, but not HPUX with WNOHANG */ | |
2809 | } | |
2810 | } | |
2811 | \f | |
2812 | ||
2813 | static Lisp_Object | |
2814 | exec_sentinel_unwind (data) | |
2815 | Lisp_Object data; | |
2816 | { | |
2817 | XPROCESS (XCONS (data)->car)->sentinel = XCONS (data)->cdr; | |
2818 | return Qnil; | |
2819 | } | |
2820 | ||
2821 | static void | |
2822 | exec_sentinel (proc, reason) | |
2823 | Lisp_Object proc, reason; | |
2824 | { | |
2825 | Lisp_Object sentinel; | |
2826 | register struct Lisp_Process *p = XPROCESS (proc); | |
2827 | int count = specpdl_ptr - specpdl; | |
2828 | ||
2829 | sentinel = p->sentinel; | |
2830 | if (NILP (sentinel)) | |
2831 | return; | |
2832 | ||
2833 | /* Zilch the sentinel while it's running, to avoid recursive invocations; | |
2834 | assure that it gets restored no matter how the sentinel exits. */ | |
2835 | p->sentinel = Qnil; | |
2836 | record_unwind_protect (exec_sentinel_unwind, Fcons (proc, sentinel)); | |
2837 | /* Inhibit quit so that random quits don't screw up a running filter. */ | |
2838 | specbind (Qinhibit_quit, Qt); | |
2839 | call2 (sentinel, proc, reason); | |
2840 | unbind_to (count); | |
2841 | } | |
2842 | ||
2843 | /* Report all recent events of a change in process status | |
2844 | (either run the sentinel or output a message). | |
2845 | This is done while Emacs is waiting for keyboard input. */ | |
2846 | ||
2847 | status_notify () | |
2848 | { | |
2849 | register Lisp_Object proc, buffer; | |
2850 | Lisp_Object tail = Qnil; | |
2851 | Lisp_Object msg = Qnil; | |
2852 | struct gcpro gcpro1, gcpro2; | |
2853 | ||
2854 | /* We need to gcpro tail; if read_process_output calls a filter | |
2855 | which deletes a process and removes the cons to which tail points | |
2856 | from Vprocess_alist, and then causes a GC, tail is an unprotected | |
2857 | reference. */ | |
2858 | GCPRO2 (tail, msg); | |
2859 | ||
2860 | for (tail = Vprocess_alist; !NILP (tail); tail = Fcdr (tail)) | |
2861 | { | |
2862 | Lisp_Object symbol; | |
2863 | register struct Lisp_Process *p; | |
2864 | ||
2865 | proc = Fcdr (Fcar (tail)); | |
2866 | p = XPROCESS (proc); | |
2867 | ||
2868 | if (XINT (p->tick) != XINT (p->update_tick)) | |
2869 | { | |
2870 | XSETINT (p->update_tick, XINT (p->tick)); | |
2871 | ||
2872 | /* If process is still active, read any output that remains. */ | |
2873 | if (XFASTINT (p->infd)) | |
2874 | while (read_process_output (proc, XFASTINT (p->infd)) > 0); | |
2875 | ||
2876 | buffer = p->buffer; | |
2877 | ||
2878 | /* Get the text to use for the message. */ | |
2879 | if (!NILP (p->raw_status_low)) | |
2880 | update_status (p); | |
2881 | msg = status_message (p->status); | |
2882 | ||
2883 | /* If process is terminated, deactivate it or delete it. */ | |
2884 | symbol = p->status; | |
2885 | if (XTYPE (p->status) == Lisp_Cons) | |
2886 | symbol = XCONS (p->status)->car; | |
2887 | ||
2888 | if (EQ (symbol, Qsignal) || EQ (symbol, Qexit) | |
2889 | || EQ (symbol, Qclosed)) | |
2890 | { | |
2891 | if (delete_exited_processes) | |
2892 | remove_process (proc); | |
2893 | else | |
2894 | deactivate_process (proc); | |
2895 | } | |
2896 | ||
2897 | /* Now output the message suitably. */ | |
2898 | if (!NILP (p->sentinel)) | |
2899 | exec_sentinel (proc, msg); | |
2900 | /* Don't bother with a message in the buffer | |
2901 | when a process becomes runnable. */ | |
2902 | else if (!EQ (symbol, Qrun) && !NILP (buffer)) | |
2903 | { | |
2904 | Lisp_Object ro = XBUFFER (buffer)->read_only; | |
2905 | Lisp_Object tem; | |
2906 | struct buffer *old = current_buffer; | |
2907 | int opoint; | |
2908 | ||
2909 | /* Avoid error if buffer is deleted | |
2910 | (probably that's why the process is dead, too) */ | |
2911 | if (NILP (XBUFFER (buffer)->name)) | |
2912 | continue; | |
2913 | Fset_buffer (buffer); | |
2914 | opoint = point; | |
2915 | /* Insert new output into buffer | |
2916 | at the current end-of-output marker, | |
2917 | thus preserving logical ordering of input and output. */ | |
2918 | if (XMARKER (p->mark)->buffer) | |
2919 | SET_PT (marker_position (p->mark)); | |
2920 | else | |
2921 | SET_PT (ZV); | |
2922 | if (point <= opoint) | |
2923 | opoint += XSTRING (msg)->size + XSTRING (p->name)->size + 10; | |
2924 | ||
2925 | tem = current_buffer->read_only; | |
2926 | current_buffer->read_only = Qnil; | |
2927 | insert_string ("\nProcess "); | |
2928 | Finsert (1, &p->name); | |
2929 | insert_string (" "); | |
2930 | Finsert (1, &msg); | |
2931 | current_buffer->read_only = tem; | |
2932 | Fset_marker (p->mark, make_number (point), p->buffer); | |
2933 | ||
2934 | SET_PT (opoint); | |
2935 | set_buffer_internal (old); | |
2936 | } | |
2937 | } | |
2938 | } /* end for */ | |
2939 | ||
2940 | update_mode_lines++; /* in case buffers use %s in mode-line-format */ | |
2941 | redisplay_preserve_echo_area (); | |
2942 | ||
2943 | update_tick = process_tick; | |
2944 | ||
2945 | UNGCPRO; | |
2946 | } | |
2947 | \f | |
2948 | init_process () | |
2949 | { | |
2950 | register int i; | |
2951 | ||
2952 | #ifdef SIGCHLD | |
2953 | #ifndef CANNOT_DUMP | |
2954 | if (! noninteractive || initialized) | |
2955 | #endif | |
2956 | signal (SIGCHLD, sigchld_handler); | |
2957 | #endif | |
2958 | ||
2959 | FD_ZERO (&input_wait_mask); | |
2960 | FD_SET (0, &input_wait_mask); | |
2961 | Vprocess_alist = Qnil; | |
2962 | for (i = 0; i < MAXDESC; i++) | |
2963 | { | |
2964 | chan_process[i] = Qnil; | |
2965 | proc_buffered_char[i] = -1; | |
2966 | } | |
2967 | } | |
08564963 | 2968 | #if 0 |
d0d6b7c5 JB |
2969 | DEFUN ("process-connection", Fprocess_connection, Sprocess_connection, 0, 1, 0, |
2970 | "Return the connection type of `PROCESS'. This can be nil (pipe),\n\ | |
2971 | t or pty (pty) or stream (socket connection).") | |
2972 | (process) | |
2973 | Lisp_Object process; | |
2974 | { | |
2975 | return XPROCESS (process)->type; | |
2976 | } | |
2977 | #endif | |
2978 | syms_of_process () | |
2979 | { | |
d0d6b7c5 JB |
2980 | #ifdef HAVE_SOCKETS |
2981 | stream_process = intern ("stream"); | |
2982 | #endif | |
2983 | Qprocessp = intern ("processp"); | |
2984 | staticpro (&Qprocessp); | |
2985 | Qrun = intern ("run"); | |
2986 | staticpro (&Qrun); | |
2987 | Qstop = intern ("stop"); | |
2988 | staticpro (&Qstop); | |
2989 | Qsignal = intern ("signal"); | |
2990 | staticpro (&Qsignal); | |
2991 | ||
2992 | /* Qexit is already staticpro'd by syms_of_eval; don't staticpro it | |
2993 | here again. | |
2994 | ||
2995 | Qexit = intern ("exit"); | |
2996 | staticpro (&Qexit); */ | |
2997 | ||
2998 | Qopen = intern ("open"); | |
2999 | staticpro (&Qopen); | |
3000 | Qclosed = intern ("closed"); | |
3001 | staticpro (&Qclosed); | |
3002 | ||
3003 | staticpro (&Vprocess_alist); | |
3004 | ||
3005 | DEFVAR_BOOL ("delete-exited-processes", &delete_exited_processes, | |
3006 | "*Non-nil means delete processes immediately when they exit.\n\ | |
3007 | nil means don't delete them until `list-processes' is run."); | |
3008 | ||
3009 | delete_exited_processes = 1; | |
3010 | ||
3011 | DEFVAR_LISP ("process-connection-type", &Vprocess_connection_type, | |
3012 | "Control type of device used to communicate with subprocesses.\n\ | |
3013 | Values are nil to use a pipe, and t or 'pty for a pty. Note that if\n\ | |
3014 | pty's are not available, this variable will be ignored. The value takes\n\ | |
3015 | effect when `start-process' is called."); | |
3016 | Vprocess_connection_type = Qt; | |
3017 | ||
3018 | defsubr (&Sprocessp); | |
3019 | defsubr (&Sget_process); | |
3020 | defsubr (&Sget_buffer_process); | |
3021 | defsubr (&Sdelete_process); | |
3022 | defsubr (&Sprocess_status); | |
3023 | defsubr (&Sprocess_exit_status); | |
3024 | defsubr (&Sprocess_id); | |
3025 | defsubr (&Sprocess_name); | |
3026 | defsubr (&Sprocess_command); | |
3027 | defsubr (&Sset_process_buffer); | |
3028 | defsubr (&Sprocess_buffer); | |
3029 | defsubr (&Sprocess_mark); | |
3030 | defsubr (&Sset_process_filter); | |
3031 | defsubr (&Sprocess_filter); | |
3032 | defsubr (&Sset_process_sentinel); | |
3033 | defsubr (&Sprocess_sentinel); | |
3034 | defsubr (&Sprocess_kill_without_query); | |
3035 | defsubr (&Slist_processes); | |
3036 | defsubr (&Sprocess_list); | |
3037 | defsubr (&Sstart_process); | |
3038 | #ifdef HAVE_SOCKETS | |
3039 | defsubr (&Sopen_network_stream); | |
3040 | #endif /* HAVE_SOCKETS */ | |
3041 | defsubr (&Saccept_process_output); | |
3042 | defsubr (&Sprocess_send_region); | |
3043 | defsubr (&Sprocess_send_string); | |
3044 | defsubr (&Sinterrupt_process); | |
3045 | defsubr (&Skill_process); | |
3046 | defsubr (&Squit_process); | |
3047 | defsubr (&Sstop_process); | |
3048 | defsubr (&Scontinue_process); | |
3049 | defsubr (&Sprocess_send_eof); | |
3050 | defsubr (&Ssignal_process); | |
3051 | defsubr (&Swaiting_for_user_input_p); | |
3052 | /* defsubr (&Sprocess_connection); */ | |
3053 | } | |
3054 | ||
6720a7fb JB |
3055 | \f |
3056 | #else /* not subprocesses */ | |
3057 | ||
3058 | #include <sys/types.h> | |
3059 | #include <errno.h> | |
3060 | ||
3061 | #include "lisp.h" | |
3062 | #include "systime.h" | |
3063 | #include "termopts.h" | |
3064 | ||
ff11dfa1 | 3065 | extern int frame_garbaged; |
6720a7fb JB |
3066 | |
3067 | ||
3068 | /* As described above, except assuming that there are no subprocesses: | |
3069 | ||
3070 | Wait for timeout to elapse and/or keyboard input to be available. | |
3071 | ||
3072 | time_limit is: | |
3073 | timeout in seconds, or | |
3074 | zero for no limit, or | |
3075 | -1 means gobble data immediately available but don't wait for any. | |
3076 | ||
f76475ad | 3077 | read_kbd is a Lisp_Object: |
6720a7fb JB |
3078 | 0 to ignore keyboard input, or |
3079 | 1 to return when input is available, or | |
3080 | -1 means caller will actually read the input, so don't throw to | |
3081 | the quit handler. | |
3082 | We know that read_kbd will never be a Lisp_Process, since | |
3083 | `subprocesses' isn't defined. | |
3084 | ||
3085 | do_display != 0 means redisplay should be done to show subprocess | |
3086 | output that arrives. This version of the function ignores it. | |
3087 | ||
f76475ad | 3088 | Return true iff we recieved input from any process. */ |
6720a7fb JB |
3089 | |
3090 | int | |
3091 | wait_reading_process_input (time_limit, microsecs, read_kbd, do_display) | |
f76475ad JB |
3092 | int time_limit, microsecs; |
3093 | Lisp_Object read_kbd; | |
3094 | int do_display; | |
6720a7fb JB |
3095 | { |
3096 | EMACS_TIME end_time, timeout, *timeout_p; | |
3097 | int waitchannels; | |
3098 | ||
3099 | /* What does time_limit really mean? */ | |
3100 | if (time_limit || microsecs) | |
3101 | { | |
3102 | /* It's not infinite. */ | |
3103 | timeout_p = &timeout; | |
3104 | ||
3105 | if (time_limit == -1) | |
3106 | /* In fact, it's zero. */ | |
3107 | EMACS_SET_SECS_USECS (timeout, 0, 0); | |
3108 | else | |
3109 | EMACS_SET_SECS_USECS (timeout, time_limit, microsecs); | |
3110 | ||
3111 | /* How far in the future is that? */ | |
3112 | EMACS_GET_TIME (end_time); | |
3113 | EMACS_ADD_TIME (end_time, end_time, timeout); | |
3114 | } | |
3115 | else | |
3116 | /* It's infinite. */ | |
3117 | timeout_p = 0; | |
3118 | ||
3119 | /* Turn off periodic alarms (in case they are in use) | |
3120 | because the select emulator uses alarms. */ | |
3121 | stop_polling (); | |
3122 | ||
3123 | for (;;) | |
3124 | { | |
3125 | int nfds; | |
3126 | ||
f76475ad | 3127 | waitchannels = XINT (read_kbd) ? 1 : 0; |
6720a7fb JB |
3128 | |
3129 | /* If calling from keyboard input, do not quit | |
3130 | since we want to return C-g as an input character. | |
3131 | Otherwise, do pending quit if requested. */ | |
f76475ad | 3132 | if (XINT (read_kbd) >= 0) |
6720a7fb JB |
3133 | QUIT; |
3134 | ||
3135 | if (timeout_p) | |
3136 | { | |
3137 | EMACS_GET_TIME (*timeout_p); | |
3138 | EMACS_SUB_TIME (*timeout_p, end_time, *timeout_p); | |
3139 | if (EMACS_TIME_NEG_P (*timeout_p)) | |
3140 | break; | |
3141 | } | |
3142 | ||
3143 | /* Cause C-g and alarm signals to take immediate action, | |
3144 | and cause input available signals to zero out timeout. */ | |
f76475ad | 3145 | if (XINT (read_kbd) < 0) |
6720a7fb JB |
3146 | set_waiting_for_input (&timeout); |
3147 | ||
ff11dfa1 | 3148 | /* If a frame has been newly mapped and needs updating, |
6720a7fb | 3149 | reprocess its display stuff. */ |
ff11dfa1 | 3150 | if (frame_garbaged) |
6720a7fb JB |
3151 | redisplay_preserve_echo_area (); |
3152 | ||
f76475ad | 3153 | if (XINT (read_kbd) && detect_input_pending ()) |
6720a7fb JB |
3154 | nfds = 0; |
3155 | else | |
3156 | nfds = select (1, &waitchannels, 0, 0, timeout_p); | |
3157 | ||
3158 | /* Make C-g and alarm signals set flags again */ | |
3159 | clear_waiting_for_input (); | |
3160 | ||
3161 | /* If we woke up due to SIGWINCH, actually change size now. */ | |
3162 | do_pending_window_change (); | |
3163 | ||
3164 | if (nfds == -1) | |
3165 | { | |
3166 | /* If the system call was interrupted, then go around the | |
3167 | loop again. */ | |
3168 | if (errno == EINTR) | |
3169 | waitchannels = 0; | |
3170 | } | |
3171 | #ifdef sun | |
3172 | else if (nfds > 0 && (waitchannels & 1) && interrupt_input) | |
3173 | /* System sometimes fails to deliver SIGIO. */ | |
3174 | kill (getpid (), SIGIO); | |
3175 | #endif | |
f76475ad | 3176 | if (XINT (read_kbd) && interrupt_input && (waitchannels & 1)) |
6720a7fb JB |
3177 | kill (0, SIGIO); |
3178 | ||
3179 | /* If we have timed out (nfds == 0) or found some input (nfds > 0), | |
3180 | we should exit. */ | |
3181 | if (nfds >= 0) | |
3182 | break; | |
3183 | } | |
3184 | ||
a87b802f JB |
3185 | start_polling (); |
3186 | ||
6720a7fb JB |
3187 | return 0; |
3188 | } | |
3189 | ||
3190 | ||
3191 | DEFUN ("get-buffer-process", Fget_buffer_process, Sget_buffer_process, 1, 1, 0, | |
3192 | "Return the (or, a) process associated with BUFFER.\n\ | |
3193 | This copy of Emacs has not been built to support subprocesses, so this\n\ | |
3194 | function always returns nil.") | |
3195 | (name) | |
3196 | register Lisp_Object name; | |
3197 | { | |
3198 | return Qnil; | |
3199 | } | |
3200 | ||
3201 | /* Kill all processes associated with `buffer'. | |
3202 | If `buffer' is nil, kill all processes. | |
3203 | Since we have no subprocesses, this does nothing. */ | |
3204 | ||
3205 | kill_buffer_processes (buffer) | |
3206 | Lisp_Object buffer; | |
3207 | { | |
3208 | } | |
3209 | ||
3210 | init_process () | |
3211 | { | |
3212 | } | |
3213 | ||
3214 | syms_of_process () | |
3215 | { | |
3216 | defsubr (&Sget_buffer_process); | |
3217 | } | |
3218 | ||
3219 | \f | |
3220 | #endif /* not subprocesses */ |