1 /* Asynchronous subprocess control for GNU Emacs.
2 Copyright (C) 1985, 86, 87, 88, 93, 94, 95, 96, 98, 1999
3 Free Software Foundation, Inc.
5 This file is part of GNU Emacs.
7 GNU Emacs is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU Emacs is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU Emacs; see the file COPYING. If not, write to
19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
23 #define _GNU_SOURCE /* to get strsignal declared with glibc 2 */
27 /* This file is split into two parts by the following preprocessor
28 conditional. The 'then' clause contains all of the support for
29 asynchronous subprocesses. The 'else' clause contains stub
30 versions of some of the asynchronous subprocess routines that are
31 often called elsewhere in Emacs, so we don't have to #ifdef the
32 sections that call them. */
40 #include <sys/types.h> /* some typedefs are used in sys/file.h */
50 #endif /* not WINDOWSNT */
52 #ifdef HAVE_SOCKETS /* TCP connection support, if kernel can do it */
53 #include <sys/socket.h>
55 #include <netinet/in.h>
56 #include <arpa/inet.h>
57 #ifdef NEED_NET_ERRNO_H
58 #include <net/errno.h>
59 #endif /* NEED_NET_ERRNO_H */
60 #endif /* HAVE_SOCKETS */
62 /* TERM is a poor-man's SLIP, used on GNU/Linux. */
67 /* On some systems, e.g. DGUX, inet_addr returns a 'struct in_addr'. */
68 #ifdef HAVE_BROKEN_INET_ADDR
69 #define IN_ADDR struct in_addr
70 #define NUMERIC_ADDR_ERROR (numeric_addr.s_addr == -1)
72 #define IN_ADDR unsigned long
73 #define NUMERIC_ADDR_ERROR (numeric_addr == -1)
76 #if defined(BSD_SYSTEM) || defined(STRIDE)
77 #include <sys/ioctl.h>
78 #if !defined (O_NDELAY) && defined (HAVE_PTYS) && !defined(USG5)
80 #endif /* HAVE_PTYS and no O_NDELAY */
81 #endif /* BSD_SYSTEM || STRIDE */
83 #ifdef BROKEN_O_NONBLOCK
85 #endif /* BROKEN_O_NONBLOCK */
92 #include <sys/sysmacros.h> /* for "minor" */
104 #include "termhooks.h"
105 #include "termopts.h"
106 #include "commands.h"
108 #include "blockinput.h"
109 #include "keyboard.h"
110 #include "dispextern.h"
111 #include "composite.h"
113 #define max(a, b) ((a) > (b) ? (a) : (b))
115 Lisp_Object Qprocessp
;
116 Lisp_Object Qrun
, Qstop
, Qsignal
, Qopen
, Qclosed
;
117 Lisp_Object Qlast_nonmenu_event
;
118 /* Qexit is declared and initialized in eval.c. */
120 /* a process object is a network connection when its childp field is neither
121 Qt nor Qnil but is instead a cons cell (HOSTNAME PORTNUM). */
124 #define NETCONN_P(p) (GC_CONSP (XPROCESS (p)->childp))
126 #define NETCONN_P(p) 0
127 #endif /* HAVE_SOCKETS */
129 /* Define first descriptor number available for subprocesses. */
131 #define FIRST_PROC_DESC 1
133 #define FIRST_PROC_DESC 3
136 /* Define SIGCHLD as an alias for SIGCLD. There are many conditionals
139 #if !defined (SIGCHLD) && defined (SIGCLD)
140 #define SIGCHLD SIGCLD
143 #include "syssignal.h"
147 extern void set_waiting_for_input
P_ ((EMACS_TIME
*));
151 extern char *sys_errlist
[];
158 /* t means use pty, nil means use a pipe,
159 maybe other values to come. */
160 static Lisp_Object Vprocess_connection_type
;
164 #include <sys/socket.h>
168 /* These next two vars are non-static since sysdep.c uses them in the
169 emulation of `select'. */
170 /* Number of events of change of status of a process. */
172 /* Number of events for which the user or sentinel has been notified. */
175 #include "sysselect.h"
177 extern int keyboard_bit_set
P_ ((SELECT_TYPE
*));
179 /* If we support a window system, turn on the code to poll periodically
180 to detect C-g. It isn't actually used when doing interrupt input. */
181 #ifdef HAVE_WINDOW_SYSTEM
182 #define POLL_FOR_INPUT
185 /* Mask of bits indicating the descriptors that we wait for input on. */
187 static SELECT_TYPE input_wait_mask
;
189 /* Mask that excludes keyboard input descriptor (s). */
191 static SELECT_TYPE non_keyboard_wait_mask
;
193 /* Mask that excludes process input descriptor (s). */
195 static SELECT_TYPE non_process_wait_mask
;
197 /* The largest descriptor currently in use for a process object. */
198 static int max_process_desc
;
200 /* The largest descriptor currently in use for keyboard input. */
201 static int max_keyboard_desc
;
203 /* Nonzero means delete a process right away if it exits. */
204 static int delete_exited_processes
;
206 /* Indexed by descriptor, gives the process (if any) for that descriptor */
207 Lisp_Object chan_process
[MAXDESC
];
209 /* Alist of elements (NAME . PROCESS) */
210 Lisp_Object Vprocess_alist
;
212 /* Buffered-ahead input char from process, indexed by channel.
213 -1 means empty (no char is buffered).
214 Used on sys V where the only way to tell if there is any
215 output from the process is to read at least one char.
216 Always -1 on systems that support FIONREAD. */
218 /* Don't make static; need to access externally. */
219 int proc_buffered_char
[MAXDESC
];
221 /* Table of `struct coding-system' for each process. */
222 static struct coding_system
*proc_decode_coding_system
[MAXDESC
];
223 static struct coding_system
*proc_encode_coding_system
[MAXDESC
];
225 static Lisp_Object
get_process ();
227 extern EMACS_TIME
timer_check ();
228 extern int timers_run
;
230 /* Maximum number of bytes to send to a pty without an eof. */
231 static int pty_max_bytes
;
233 extern Lisp_Object Vfile_name_coding_system
, Vdefault_file_name_coding_system
;
236 /* The file name of the pty opened by allocate_pty. */
238 static char pty_name
[24];
241 /* Compute the Lisp form of the process status, p->status, from
242 the numeric status that was returned by `wait'. */
244 Lisp_Object
status_convert ();
248 struct Lisp_Process
*p
;
250 union { int i
; WAITTYPE wt
; } u
;
251 u
.i
= XFASTINT (p
->raw_status_low
) + (XFASTINT (p
->raw_status_high
) << 16);
252 p
->status
= status_convert (u
.wt
);
253 p
->raw_status_low
= Qnil
;
254 p
->raw_status_high
= Qnil
;
257 /* Convert a process status word in Unix format to
258 the list that we use internally. */
265 return Fcons (Qstop
, Fcons (make_number (WSTOPSIG (w
)), Qnil
));
266 else if (WIFEXITED (w
))
267 return Fcons (Qexit
, Fcons (make_number (WRETCODE (w
)),
268 WCOREDUMP (w
) ? Qt
: Qnil
));
269 else if (WIFSIGNALED (w
))
270 return Fcons (Qsignal
, Fcons (make_number (WTERMSIG (w
)),
271 WCOREDUMP (w
) ? Qt
: Qnil
));
276 /* Given a status-list, extract the three pieces of information
277 and store them individually through the three pointers. */
280 decode_status (l
, symbol
, code
, coredump
)
298 *code
= XFASTINT (XCAR (tem
));
300 *coredump
= !NILP (tem
);
304 /* Return a string describing a process status list. */
307 status_message (status
)
312 Lisp_Object string
, string2
;
314 decode_status (status
, &symbol
, &code
, &coredump
);
316 if (EQ (symbol
, Qsignal
) || EQ (symbol
, Qstop
))
319 synchronize_system_messages_locale ();
320 signame
= strsignal (code
);
323 string
= build_string (signame
);
324 string2
= build_string (coredump
? " (core dumped)\n" : "\n");
325 XSTRING (string
)->data
[0] = DOWNCASE (XSTRING (string
)->data
[0]);
326 return concat2 (string
, string2
);
328 else if (EQ (symbol
, Qexit
))
331 return build_string ("finished\n");
332 string
= Fnumber_to_string (make_number (code
));
333 string2
= build_string (coredump
? " (core dumped)\n" : "\n");
334 return concat2 (build_string ("exited abnormally with code "),
335 concat2 (string
, string2
));
338 return Fcopy_sequence (Fsymbol_name (symbol
));
343 /* Open an available pty, returning a file descriptor.
344 Return -1 on failure.
345 The file name of the terminal corresponding to the pty
346 is left in the variable pty_name. */
355 /* Some systems name their pseudoterminals so that there are gaps in
356 the usual sequence - for example, on HP9000/S700 systems, there
357 are no pseudoterminals with names ending in 'f'. So we wait for
358 three failures in a row before deciding that we've reached the
360 int failed_count
= 0;
365 for (c
= FIRST_PTY_LETTER
; c
<= 'z'; c
++)
366 for (i
= 0; i
< 16; i
++)
369 #ifdef PTY_NAME_SPRINTF
372 sprintf (pty_name
, "/dev/pty%c%x", c
, i
);
373 #endif /* no PTY_NAME_SPRINTF */
377 #else /* no PTY_OPEN */
379 /* Unusual IRIS code */
380 *ptyv
= emacs_open ("/dev/ptc", O_RDWR
| O_NDELAY
, 0);
383 if (fstat (fd
, &stb
) < 0)
386 if (stat (pty_name
, &stb
) < 0)
389 if (failed_count
>= 3)
395 fd
= emacs_open (pty_name
, O_RDWR
| O_NONBLOCK
, 0);
397 fd
= emacs_open (pty_name
, O_RDWR
| O_NDELAY
, 0);
399 #endif /* not IRIS */
400 #endif /* no PTY_OPEN */
404 /* check to make certain that both sides are available
405 this avoids a nasty yet stupid bug in rlogins */
406 #ifdef PTY_TTY_NAME_SPRINTF
409 sprintf (pty_name
, "/dev/tty%c%x", c
, i
);
410 #endif /* no PTY_TTY_NAME_SPRINTF */
412 if (access (pty_name
, 6) != 0)
415 #if !defined(IRIS) && !defined(__sgi)
421 #endif /* not UNIPLUS */
428 #endif /* HAVE_PTYS */
434 struct Lisp_Vector
*vec
;
435 register Lisp_Object val
, tem
, name1
;
436 register struct Lisp_Process
*p
;
440 vec
= allocate_vectorlike ((EMACS_INT
) VECSIZE (struct Lisp_Process
));
441 for (i
= 0; i
< VECSIZE (struct Lisp_Process
); i
++)
442 vec
->contents
[i
] = Qnil
;
443 vec
->size
= VECSIZE (struct Lisp_Process
);
444 p
= (struct Lisp_Process
*)vec
;
446 XSETINT (p
->infd
, -1);
447 XSETINT (p
->outfd
, -1);
448 XSETFASTINT (p
->pid
, 0);
449 XSETFASTINT (p
->tick
, 0);
450 XSETFASTINT (p
->update_tick
, 0);
451 p
->raw_status_low
= Qnil
;
452 p
->raw_status_high
= Qnil
;
454 p
->mark
= Fmake_marker ();
456 /* If name is already in use, modify it until it is unused. */
461 tem
= Fget_process (name1
);
462 if (NILP (tem
)) break;
463 sprintf (suffix
, "<%d>", i
);
464 name1
= concat2 (name
, build_string (suffix
));
468 XSETPROCESS (val
, p
);
469 Vprocess_alist
= Fcons (Fcons (name
, val
), Vprocess_alist
);
474 remove_process (proc
)
475 register Lisp_Object proc
;
477 register Lisp_Object pair
;
479 pair
= Frassq (proc
, Vprocess_alist
);
480 Vprocess_alist
= Fdelq (pair
, Vprocess_alist
);
482 deactivate_process (proc
);
485 DEFUN ("processp", Fprocessp
, Sprocessp
, 1, 1, 0,
486 "Return t if OBJECT is a process.")
490 return PROCESSP (object
) ? Qt
: Qnil
;
493 DEFUN ("get-process", Fget_process
, Sget_process
, 1, 1, 0,
494 "Return the process named NAME, or nil if there is none.")
496 register Lisp_Object name
;
500 CHECK_STRING (name
, 0);
501 return Fcdr (Fassoc (name
, Vprocess_alist
));
504 DEFUN ("get-buffer-process", Fget_buffer_process
, Sget_buffer_process
, 1, 1, 0,
505 "Return the (or a) process associated with BUFFER.\n\
506 BUFFER may be a buffer or the name of one.")
508 register Lisp_Object buffer
;
510 register Lisp_Object buf
, tail
, proc
;
512 if (NILP (buffer
)) return Qnil
;
513 buf
= Fget_buffer (buffer
);
514 if (NILP (buf
)) return Qnil
;
516 for (tail
= Vprocess_alist
; !NILP (tail
); tail
= Fcdr (tail
))
518 proc
= Fcdr (Fcar (tail
));
519 if (PROCESSP (proc
) && EQ (XPROCESS (proc
)->buffer
, buf
))
525 /* This is how commands for the user decode process arguments. It
526 accepts a process, a process name, a buffer, a buffer name, or nil.
527 Buffers denote the first process in the buffer, and nil denotes the
532 register Lisp_Object name
;
534 register Lisp_Object proc
, obj
;
537 obj
= Fget_process (name
);
539 obj
= Fget_buffer (name
);
541 error ("Process %s does not exist", XSTRING (name
)->data
);
543 else if (NILP (name
))
544 obj
= Fcurrent_buffer ();
548 /* Now obj should be either a buffer object or a process object.
552 proc
= Fget_buffer_process (obj
);
554 error ("Buffer %s has no process", XSTRING (XBUFFER (obj
)->name
)->data
);
558 CHECK_PROCESS (obj
, 0);
564 DEFUN ("delete-process", Fdelete_process
, Sdelete_process
, 1, 1, 0,
565 "Delete PROCESS: kill it and forget about it immediately.\n\
566 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
567 nil, indicating the current buffer's process.")
569 register Lisp_Object process
;
571 process
= get_process (process
);
572 XPROCESS (process
)->raw_status_low
= Qnil
;
573 XPROCESS (process
)->raw_status_high
= Qnil
;
574 if (NETCONN_P (process
))
576 XPROCESS (process
)->status
= Fcons (Qexit
, Fcons (make_number (0), Qnil
));
577 XSETINT (XPROCESS (process
)->tick
, ++process_tick
);
579 else if (XINT (XPROCESS (process
)->infd
) >= 0)
581 Fkill_process (process
, Qnil
);
582 /* Do this now, since remove_process will make sigchld_handler do nothing. */
583 XPROCESS (process
)->status
584 = Fcons (Qsignal
, Fcons (make_number (SIGKILL
), Qnil
));
585 XSETINT (XPROCESS (process
)->tick
, ++process_tick
);
588 remove_process (process
);
592 DEFUN ("process-status", Fprocess_status
, Sprocess_status
, 1, 1, 0,
593 "Return the status of PROCESS.\n\
594 The returned value is one of the following symbols:\n\
595 run -- for a process that is running.\n\
596 stop -- for a process stopped but continuable.\n\
597 exit -- for a process that has exited.\n\
598 signal -- for a process that has got a fatal signal.\n\
599 open -- for a network stream connection that is open.\n\
600 closed -- for a network stream connection that is closed.\n\
601 nil -- if arg is a process name and no such process exists.\n\
602 PROCESS may be a process, a buffer, the name of a process, or\n\
603 nil, indicating the current buffer's process.")
605 register Lisp_Object process
;
607 register struct Lisp_Process
*p
;
608 register Lisp_Object status
;
610 if (STRINGP (process
))
611 process
= Fget_process (process
);
613 process
= get_process (process
);
618 p
= XPROCESS (process
);
619 if (!NILP (p
->raw_status_low
))
623 status
= XCAR (status
);
624 if (NETCONN_P (process
))
626 if (EQ (status
, Qrun
))
628 else if (EQ (status
, Qexit
))
634 DEFUN ("process-exit-status", Fprocess_exit_status
, Sprocess_exit_status
,
636 "Return the exit status of PROCESS or the signal number that killed it.\n\
637 If PROCESS has not yet exited or died, return 0.")
639 register Lisp_Object process
;
641 CHECK_PROCESS (process
, 0);
642 if (!NILP (XPROCESS (process
)->raw_status_low
))
643 update_status (XPROCESS (process
));
644 if (CONSP (XPROCESS (process
)->status
))
645 return XCAR (XCDR (XPROCESS (process
)->status
));
646 return make_number (0);
649 DEFUN ("process-id", Fprocess_id
, Sprocess_id
, 1, 1, 0,
650 "Return the process id of PROCESS.\n\
651 This is the pid of the Unix process which PROCESS uses or talks to.\n\
652 For a network connection, this value is nil.")
654 register Lisp_Object process
;
656 CHECK_PROCESS (process
, 0);
657 return XPROCESS (process
)->pid
;
660 DEFUN ("process-name", Fprocess_name
, Sprocess_name
, 1, 1, 0,
661 "Return the name of PROCESS, as a string.\n\
662 This is the name of the program invoked in PROCESS,\n\
663 possibly modified to make it unique among process names.")
665 register Lisp_Object process
;
667 CHECK_PROCESS (process
, 0);
668 return XPROCESS (process
)->name
;
671 DEFUN ("process-command", Fprocess_command
, Sprocess_command
, 1, 1, 0,
672 "Return the command that was executed to start PROCESS.\n\
673 This is a list of strings, the first string being the program executed\n\
674 and the rest of the strings being the arguments given to it.\n\
675 For a non-child channel, this is nil.")
677 register Lisp_Object process
;
679 CHECK_PROCESS (process
, 0);
680 return XPROCESS (process
)->command
;
683 DEFUN ("process-tty-name", Fprocess_tty_name
, Sprocess_tty_name
, 1, 1, 0,
684 "Return the name of the terminal PROCESS uses, or nil if none.\n\
685 This is the terminal that the process itself reads and writes on,\n\
686 not the name of the pty that Emacs uses to talk with that terminal.")
688 register Lisp_Object process
;
690 CHECK_PROCESS (process
, 0);
691 return XPROCESS (process
)->tty_name
;
694 DEFUN ("set-process-buffer", Fset_process_buffer
, Sset_process_buffer
,
696 "Set buffer associated with PROCESS to BUFFER (a buffer, or nil).")
698 register Lisp_Object process
, buffer
;
700 CHECK_PROCESS (process
, 0);
702 CHECK_BUFFER (buffer
, 1);
703 XPROCESS (process
)->buffer
= buffer
;
707 DEFUN ("process-buffer", Fprocess_buffer
, Sprocess_buffer
,
709 "Return the buffer PROCESS is associated with.\n\
710 Output from PROCESS is inserted in this buffer unless PROCESS has a filter.")
712 register Lisp_Object process
;
714 CHECK_PROCESS (process
, 0);
715 return XPROCESS (process
)->buffer
;
718 DEFUN ("process-mark", Fprocess_mark
, Sprocess_mark
,
720 "Return the marker for the end of the last output from PROCESS.")
722 register Lisp_Object process
;
724 CHECK_PROCESS (process
, 0);
725 return XPROCESS (process
)->mark
;
728 DEFUN ("set-process-filter", Fset_process_filter
, Sset_process_filter
,
730 "Give PROCESS the filter function FILTER; nil means no filter.\n\
731 t means stop accepting output from the process.\n\
732 When a process has a filter, each time it does output\n\
733 the entire string of output is passed to the filter.\n\
734 The filter gets two arguments: the process and the string of output.\n\
735 If the process has a filter, its buffer is not used for output.")
737 register Lisp_Object process
, filter
;
739 CHECK_PROCESS (process
, 0);
742 FD_CLR (XINT (XPROCESS (process
)->infd
), &input_wait_mask
);
743 FD_CLR (XINT (XPROCESS (process
)->infd
), &non_keyboard_wait_mask
);
745 else if (EQ (XPROCESS (process
)->filter
, Qt
))
747 FD_SET (XINT (XPROCESS (process
)->infd
), &input_wait_mask
);
748 FD_SET (XINT (XPROCESS (process
)->infd
), &non_keyboard_wait_mask
);
750 XPROCESS (process
)->filter
= filter
;
754 DEFUN ("process-filter", Fprocess_filter
, Sprocess_filter
,
756 "Returns the filter function of PROCESS; nil if none.\n\
757 See `set-process-filter' for more info on filter functions.")
759 register Lisp_Object process
;
761 CHECK_PROCESS (process
, 0);
762 return XPROCESS (process
)->filter
;
765 DEFUN ("set-process-sentinel", Fset_process_sentinel
, Sset_process_sentinel
,
767 "Give PROCESS the sentinel SENTINEL; nil for none.\n\
768 The sentinel is called as a function when the process changes state.\n\
769 It gets two arguments: the process, and a string describing the change.")
771 register Lisp_Object process
, sentinel
;
773 CHECK_PROCESS (process
, 0);
774 XPROCESS (process
)->sentinel
= sentinel
;
778 DEFUN ("process-sentinel", Fprocess_sentinel
, Sprocess_sentinel
,
780 "Return the sentinel of PROCESS; nil if none.\n\
781 See `set-process-sentinel' for more info on sentinels.")
783 register Lisp_Object process
;
785 CHECK_PROCESS (process
, 0);
786 return XPROCESS (process
)->sentinel
;
789 DEFUN ("set-process-window-size", Fset_process_window_size
,
790 Sset_process_window_size
, 3, 3, 0,
791 "Tell PROCESS that it has logical window size HEIGHT and WIDTH.")
792 (process
, height
, width
)
793 register Lisp_Object process
, height
, width
;
795 CHECK_PROCESS (process
, 0);
796 CHECK_NATNUM (height
, 0);
797 CHECK_NATNUM (width
, 0);
798 if (set_window_size (XINT (XPROCESS (process
)->infd
),
799 XINT (height
), XINT (width
)) <= 0)
805 DEFUN ("set-process-inherit-coding-system-flag",
806 Fset_process_inherit_coding_system_flag
,
807 Sset_process_inherit_coding_system_flag
, 2, 2, 0,
808 "Determine whether buffer of PROCESS will inherit coding-system.\n\
809 If the second argument FLAG is non-nil, then the variable\n\
810 `buffer-file-coding-system' of the buffer associated with PROCESS\n\
811 will be bound to the value of the coding system used to decode\n\
812 the process output.\n\
814 This is useful when the coding system specified for the process buffer\n\
815 leaves either the character code conversion or the end-of-line conversion\n\
816 unspecified, or if the coding system used to decode the process output\n\
817 is more appropriate for saving the process buffer.\n\
819 Binding the variable `inherit-process-coding-system' to non-nil before\n\
820 starting the process is an alternative way of setting the inherit flag\n\
821 for the process which will run.")
823 register Lisp_Object process
, flag
;
825 CHECK_PROCESS (process
, 0);
826 XPROCESS (process
)->inherit_coding_system_flag
= flag
;
830 DEFUN ("process-inherit-coding-system-flag",
831 Fprocess_inherit_coding_system_flag
, Sprocess_inherit_coding_system_flag
,
833 "Return the value of inherit-coding-system flag for PROCESS.\n\
834 If this flag is t, `buffer-file-coding-system' of the buffer\n\
835 associated with PROCESS will inherit the coding system used to decode\n\
836 the process output.")
838 register Lisp_Object process
;
840 CHECK_PROCESS (process
, 0);
841 return XPROCESS (process
)->inherit_coding_system_flag
;
844 DEFUN ("process-kill-without-query", Fprocess_kill_without_query
,
845 Sprocess_kill_without_query
, 1, 2, 0,
846 "Say no query needed if PROCESS is running when Emacs is exited.\n\
847 Optional second argument if non-nil says to require a query.\n\
848 Value is t if a query was formerly required.")
850 register Lisp_Object process
, value
;
854 CHECK_PROCESS (process
, 0);
855 tem
= XPROCESS (process
)->kill_without_query
;
856 XPROCESS (process
)->kill_without_query
= Fnull (value
);
861 DEFUN ("process-contact", Fprocess_contact
, Sprocess_contact
,
863 "Return the contact info of PROCESS; t for a real child.\n\
864 For a net connection, the value is a cons cell of the form (HOST SERVICE).")
866 register Lisp_Object process
;
868 CHECK_PROCESS (process
, 0);
869 return XPROCESS (process
)->childp
;
872 #if 0 /* Turned off because we don't currently record this info
873 in the process. Perhaps add it. */
874 DEFUN ("process-connection", Fprocess_connection
, Sprocess_connection
, 1, 1, 0,
875 "Return the connection type of PROCESS.\n\
876 The value is nil for a pipe, t or `pty' for a pty, or `stream' for\n\
877 a socket connection.")
881 return XPROCESS (process
)->type
;
888 register Lisp_Object tail
, tem
;
889 Lisp_Object proc
, minspace
, tem1
;
890 register struct Lisp_Process
*p
;
893 XSETFASTINT (minspace
, 1);
895 set_buffer_internal (XBUFFER (Vstandard_output
));
896 Fbuffer_disable_undo (Vstandard_output
);
898 current_buffer
->truncate_lines
= Qt
;
901 Proc Status Buffer Tty Command\n\
902 ---- ------ ------ --- -------\n", -1);
904 for (tail
= Vprocess_alist
; !NILP (tail
); tail
= Fcdr (tail
))
908 proc
= Fcdr (Fcar (tail
));
910 if (NILP (p
->childp
))
913 Finsert (1, &p
->name
);
914 Findent_to (make_number (13), minspace
);
916 if (!NILP (p
->raw_status_low
))
919 if (CONSP (p
->status
))
920 symbol
= XCAR (p
->status
);
923 if (EQ (symbol
, Qsignal
))
926 tem
= Fcar (Fcdr (p
->status
));
928 if (XINT (tem
) < NSIG
)
929 write_string (sys_errlist
[XINT (tem
)], -1);
932 Fprinc (symbol
, Qnil
);
934 else if (NETCONN_P (proc
))
936 if (EQ (symbol
, Qrun
))
937 write_string ("open", -1);
938 else if (EQ (symbol
, Qexit
))
939 write_string ("closed", -1);
941 Fprinc (symbol
, Qnil
);
944 Fprinc (symbol
, Qnil
);
946 if (EQ (symbol
, Qexit
))
949 tem
= Fcar (Fcdr (p
->status
));
952 sprintf (tembuf
, " %d", (int) XFASTINT (tem
));
953 write_string (tembuf
, -1);
957 if (EQ (symbol
, Qsignal
) || EQ (symbol
, Qexit
))
958 remove_process (proc
);
960 Findent_to (make_number (22), minspace
);
961 if (NILP (p
->buffer
))
962 insert_string ("(none)");
963 else if (NILP (XBUFFER (p
->buffer
)->name
))
964 insert_string ("(Killed)");
966 Finsert (1, &XBUFFER (p
->buffer
)->name
);
968 Findent_to (make_number (37), minspace
);
970 if (STRINGP (p
->tty_name
))
971 Finsert (1, &p
->tty_name
);
973 insert_string ("(none)");
975 Findent_to (make_number (49), minspace
);
977 if (NETCONN_P (proc
))
979 sprintf (tembuf
, "(network stream connection to %s)\n",
980 XSTRING (XCAR (p
->childp
))->data
);
981 insert_string (tembuf
);
995 insert_string ("\n");
1001 DEFUN ("list-processes", Flist_processes
, Slist_processes
, 0, 0, "",
1002 "Display a list of all processes.\n\
1003 Any process listed as exited or signaled is actually eliminated\n\
1004 after the listing is made.")
1007 internal_with_output_to_temp_buffer ("*Process List*",
1008 list_processes_1
, Qnil
);
1012 DEFUN ("process-list", Fprocess_list
, Sprocess_list
, 0, 0, 0,
1013 "Return a list of all processes.")
1016 return Fmapcar (Qcdr
, Vprocess_alist
);
1019 /* Starting asynchronous inferior processes. */
1021 static Lisp_Object
start_process_unwind ();
1023 DEFUN ("start-process", Fstart_process
, Sstart_process
, 3, MANY
, 0,
1024 "Start a program in a subprocess. Return the process object for it.\n\
1025 Args are NAME BUFFER PROGRAM &rest PROGRAM-ARGS\n\
1026 NAME is name for process. It is modified if necessary to make it unique.\n\
1027 BUFFER is the buffer or (buffer-name) to associate with the process.\n\
1028 Process output goes at end of that buffer, unless you specify\n\
1029 an output stream or filter function to handle the output.\n\
1030 BUFFER may be also nil, meaning that this process is not associated\n\
1032 Third arg is program file name. It is searched for in PATH.\n\
1033 Remaining arguments are strings to give program as arguments.")
1036 register Lisp_Object
*args
;
1038 Lisp_Object buffer
, name
, program
, proc
, current_dir
, tem
;
1040 register unsigned char *new_argv
;
1043 register unsigned char **new_argv
;
1046 int count
= specpdl_ptr
- specpdl
;
1050 buffer
= Fget_buffer_create (buffer
);
1052 /* Make sure that the child will be able to chdir to the current
1053 buffer's current directory, or its unhandled equivalent. We
1054 can't just have the child check for an error when it does the
1055 chdir, since it's in a vfork.
1057 We have to GCPRO around this because Fexpand_file_name and
1058 Funhandled_file_name_directory might call a file name handling
1059 function. The argument list is protected by the caller, so all
1060 we really have to worry about is buffer. */
1062 struct gcpro gcpro1
, gcpro2
;
1064 current_dir
= current_buffer
->directory
;
1066 GCPRO2 (buffer
, current_dir
);
1069 = expand_and_dir_to_file (Funhandled_file_name_directory (current_dir
),
1071 if (NILP (Ffile_accessible_directory_p (current_dir
)))
1072 report_file_error ("Setting current directory",
1073 Fcons (current_buffer
->directory
, Qnil
));
1079 CHECK_STRING (name
, 0);
1083 CHECK_STRING (program
, 2);
1086 /* Make a one member argv with all args concatenated
1087 together separated by a blank. */
1088 len
= STRING_BYTES (XSTRING (program
)) + 2;
1089 for (i
= 3; i
< nargs
; i
++)
1092 CHECK_STRING (tem
, i
);
1093 len
+= STRING_BYTES (XSTRING (tem
)) + 1; /* count the blank */
1095 new_argv
= (unsigned char *) alloca (len
);
1096 strcpy (new_argv
, XSTRING (program
)->data
);
1097 for (i
= 3; i
< nargs
; i
++)
1100 CHECK_STRING (tem
, i
);
1101 strcat (new_argv
, " ");
1102 strcat (new_argv
, XSTRING (tem
)->data
);
1104 /* Need to add code here to check for program existence on VMS */
1107 new_argv
= (unsigned char **) alloca ((nargs
- 1) * sizeof (char *));
1109 /* If program file name is not absolute, search our path for it */
1110 if (!IS_DIRECTORY_SEP (XSTRING (program
)->data
[0])
1111 && !(XSTRING (program
)->size
> 1
1112 && IS_DEVICE_SEP (XSTRING (program
)->data
[1])))
1114 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
;
1117 GCPRO4 (name
, program
, buffer
, current_dir
);
1118 openp (Vexec_path
, program
, EXEC_SUFFIXES
, &tem
, 1);
1121 report_file_error ("Searching for program", Fcons (program
, Qnil
));
1122 tem
= Fexpand_file_name (tem
, Qnil
);
1123 new_argv
[0] = XSTRING (tem
)->data
;
1127 if (!NILP (Ffile_directory_p (program
)))
1128 error ("Specified program for new process is a directory");
1130 new_argv
[0] = XSTRING (program
)->data
;
1133 for (i
= 3; i
< nargs
; i
++)
1136 CHECK_STRING (tem
, i
);
1137 new_argv
[i
- 2] = XSTRING (tem
)->data
;
1139 new_argv
[i
- 2] = 0;
1140 #endif /* not VMS */
1142 proc
= make_process (name
);
1143 /* If an error occurs and we can't start the process, we want to
1144 remove it from the process list. This means that each error
1145 check in create_process doesn't need to call remove_process
1146 itself; it's all taken care of here. */
1147 record_unwind_protect (start_process_unwind
, proc
);
1149 XPROCESS (proc
)->childp
= Qt
;
1150 XPROCESS (proc
)->command_channel_p
= Qnil
;
1151 XPROCESS (proc
)->buffer
= buffer
;
1152 XPROCESS (proc
)->sentinel
= Qnil
;
1153 XPROCESS (proc
)->filter
= Qnil
;
1154 XPROCESS (proc
)->command
= Flist (nargs
- 2, args
+ 2);
1156 /* Make the process marker point into the process buffer (if any). */
1158 set_marker_both (XPROCESS (proc
)->mark
, buffer
,
1159 BUF_ZV (XBUFFER (buffer
)),
1160 BUF_ZV_BYTE (XBUFFER (buffer
)));
1163 /* Decide coding systems for communicating with the process. Here
1164 we don't setup the structure coding_system nor pay attention to
1165 unibyte mode. They are done in create_process. */
1167 /* Qt denotes we have not yet called Ffind_operation_coding_system. */
1168 Lisp_Object coding_systems
= Qt
;
1169 Lisp_Object val
, *args2
;
1170 struct gcpro gcpro1
;
1172 val
= Vcoding_system_for_read
;
1175 args2
= (Lisp_Object
*) alloca ((nargs
+ 1) * sizeof *args2
);
1176 args2
[0] = Qstart_process
;
1177 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
1179 coding_systems
= Ffind_operation_coding_system (nargs
+ 1, args2
);
1181 if (CONSP (coding_systems
))
1182 val
= XCAR (coding_systems
);
1183 else if (CONSP (Vdefault_process_coding_system
))
1184 val
= XCAR (Vdefault_process_coding_system
);
1186 XPROCESS (proc
)->decode_coding_system
= val
;
1188 val
= Vcoding_system_for_write
;
1191 if (EQ (coding_systems
, Qt
))
1193 args2
= (Lisp_Object
*) alloca ((nargs
+ 1) * sizeof args2
);
1194 args2
[0] = Qstart_process
;
1195 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
1197 coding_systems
= Ffind_operation_coding_system (nargs
+ 1, args2
);
1200 if (CONSP (coding_systems
))
1201 val
= XCDR (coding_systems
);
1202 else if (CONSP (Vdefault_process_coding_system
))
1203 val
= XCDR (Vdefault_process_coding_system
);
1205 XPROCESS (proc
)->encode_coding_system
= val
;
1208 XPROCESS (proc
)->decoding_buf
= make_uninit_string (0);
1209 XPROCESS (proc
)->decoding_carryover
= make_number (0);
1210 XPROCESS (proc
)->encoding_buf
= make_uninit_string (0);
1211 XPROCESS (proc
)->encoding_carryover
= make_number (0);
1213 XPROCESS (proc
)->inherit_coding_system_flag
1214 = (NILP (buffer
) || !inherit_process_coding_system
1217 create_process (proc
, (char **) new_argv
, current_dir
);
1219 return unbind_to (count
, proc
);
1222 /* This function is the unwind_protect form for Fstart_process. If
1223 PROC doesn't have its pid set, then we know someone has signaled
1224 an error and the process wasn't started successfully, so we should
1225 remove it from the process list. */
1227 start_process_unwind (proc
)
1230 if (!PROCESSP (proc
))
1233 /* Was PROC started successfully? */
1234 if (XINT (XPROCESS (proc
)->pid
) <= 0)
1235 remove_process (proc
);
1242 create_process_1 (signo
)
1245 #if defined (USG) && !defined (POSIX_SIGNALS)
1246 /* USG systems forget handlers when they are used;
1247 must reestablish each time */
1248 signal (signo
, create_process_1
);
1252 #if 0 /* This doesn't work; see the note before sigchld_handler. */
1255 /* Mimic blocking of signals on system V, which doesn't really have it. */
1257 /* Nonzero means we got a SIGCHLD when it was supposed to be blocked. */
1258 int sigchld_deferred
;
1261 create_process_sigchld ()
1263 signal (SIGCHLD
, create_process_sigchld
);
1265 sigchld_deferred
= 1;
1271 #ifndef VMS /* VMS version of this function is in vmsproc.c. */
1273 create_process (process
, new_argv
, current_dir
)
1274 Lisp_Object process
;
1276 Lisp_Object current_dir
;
1278 int pid
, inchannel
, outchannel
;
1280 #ifdef POSIX_SIGNALS
1283 struct sigaction sigint_action
;
1284 struct sigaction sigquit_action
;
1286 struct sigaction sighup_action
;
1288 #else /* !POSIX_SIGNALS */
1291 SIGTYPE (*sigchld
)();
1294 #endif /* !POSIX_SIGNALS */
1295 /* Use volatile to protect variables from being clobbered by longjmp. */
1296 volatile int forkin
, forkout
;
1297 volatile int pty_flag
= 0;
1298 extern char **environ
;
1299 Lisp_Object buffer
= XPROCESS (process
)->buffer
;
1301 inchannel
= outchannel
= -1;
1304 if (!NILP (Vprocess_connection_type
))
1305 outchannel
= inchannel
= allocate_pty ();
1310 /* On USG systems it does not work to open the pty's tty here
1311 and then close and reopen it in the child. */
1313 /* Don't let this terminal become our controlling terminal
1314 (in case we don't have one). */
1315 forkout
= forkin
= emacs_open (pty_name
, O_RDWR
| O_NOCTTY
, 0);
1317 forkout
= forkin
= emacs_open (pty_name
, O_RDWR
, 0);
1320 report_file_error ("Opening pty", Qnil
);
1322 forkin
= forkout
= -1;
1323 #endif /* not USG */
1327 #endif /* HAVE_PTYS */
1330 if (socketpair (AF_UNIX
, SOCK_STREAM
, 0, sv
) < 0)
1331 report_file_error ("Opening socketpair", Qnil
);
1332 outchannel
= inchannel
= sv
[0];
1333 forkout
= forkin
= sv
[1];
1335 #else /* not SKTPAIR */
1340 report_file_error ("Creating pipe", Qnil
);
1346 emacs_close (inchannel
);
1347 emacs_close (forkout
);
1348 report_file_error ("Creating pipe", Qnil
);
1353 #endif /* not SKTPAIR */
1356 /* Replaced by close_process_descs */
1357 set_exclusive_use (inchannel
);
1358 set_exclusive_use (outchannel
);
1361 /* Stride people say it's a mystery why this is needed
1362 as well as the O_NDELAY, but that it fails without this. */
1363 #if defined (STRIDE) || (defined (pfa) && defined (HAVE_PTYS))
1366 ioctl (inchannel
, FIONBIO
, &one
);
1371 fcntl (inchannel
, F_SETFL
, O_NONBLOCK
);
1372 fcntl (outchannel
, F_SETFL
, O_NONBLOCK
);
1375 fcntl (inchannel
, F_SETFL
, O_NDELAY
);
1376 fcntl (outchannel
, F_SETFL
, O_NDELAY
);
1380 /* Record this as an active process, with its channels.
1381 As a result, child_setup will close Emacs's side of the pipes. */
1382 chan_process
[inchannel
] = process
;
1383 XSETINT (XPROCESS (process
)->infd
, inchannel
);
1384 XSETINT (XPROCESS (process
)->outfd
, outchannel
);
1385 /* Record the tty descriptor used in the subprocess. */
1387 XPROCESS (process
)->subtty
= Qnil
;
1389 XSETFASTINT (XPROCESS (process
)->subtty
, forkin
);
1390 XPROCESS (process
)->pty_flag
= (pty_flag
? Qt
: Qnil
);
1391 XPROCESS (process
)->status
= Qrun
;
1392 if (!proc_decode_coding_system
[inchannel
])
1393 proc_decode_coding_system
[inchannel
]
1394 = (struct coding_system
*) xmalloc (sizeof (struct coding_system
));
1395 setup_coding_system (XPROCESS (process
)->decode_coding_system
,
1396 proc_decode_coding_system
[inchannel
]);
1397 if (!proc_encode_coding_system
[outchannel
])
1398 proc_encode_coding_system
[outchannel
]
1399 = (struct coding_system
*) xmalloc (sizeof (struct coding_system
));
1400 setup_coding_system (XPROCESS (process
)->encode_coding_system
,
1401 proc_encode_coding_system
[outchannel
]);
1403 if ((!NILP (buffer
) && NILP (XBUFFER (buffer
)->enable_multibyte_characters
))
1404 || (NILP (buffer
) && NILP (buffer_defaults
.enable_multibyte_characters
)))
1406 /* In unibyte mode, character code conversion should not take
1407 place but EOL conversion should. So, setup raw-text or one
1408 of the subsidiary according to the information just setup. */
1409 if (!NILP (XPROCESS (process
)->decode_coding_system
))
1410 setup_raw_text_coding_system (proc_decode_coding_system
[inchannel
]);
1411 if (!NILP (XPROCESS (process
)->encode_coding_system
))
1412 setup_raw_text_coding_system (proc_encode_coding_system
[outchannel
]);
1415 if (CODING_REQUIRE_ENCODING (proc_encode_coding_system
[outchannel
]))
1417 /* Here we encode arguments by the coding system used for
1418 sending data to the process. We don't support using
1419 different coding systems for encoding arguments and for
1420 encoding data sent to the process. */
1421 struct gcpro gcpro1
;
1423 struct coding_system
*coding
= proc_encode_coding_system
[outchannel
];
1425 coding
->mode
|= CODING_MODE_LAST_BLOCK
;
1427 while (new_argv
[i
] != 0)
1429 int len
= strlen (new_argv
[i
]);
1430 int size
= encoding_buffer_size (coding
, len
);
1431 unsigned char *buf
= (unsigned char *) alloca (size
);
1433 encode_coding (coding
, (unsigned char *)new_argv
[i
], buf
, len
, size
);
1434 buf
[coding
->produced
] = 0;
1435 /* We don't have to free new_argv[i] because it points to a
1436 Lisp string given as an argument to `start-process'. */
1437 new_argv
[i
++] = (char *) buf
;
1440 coding
->mode
&= ~CODING_MODE_LAST_BLOCK
;
1443 /* Delay interrupts until we have a chance to store
1444 the new fork's pid in its process structure */
1445 #ifdef POSIX_SIGNALS
1446 sigemptyset (&blocked
);
1448 sigaddset (&blocked
, SIGCHLD
);
1451 /* On many hosts (e.g. Solaris 2.4), if a vforked child calls `signal',
1452 this sets the parent's signal handlers as well as the child's.
1453 So delay all interrupts whose handlers the child might munge,
1454 and record the current handlers so they can be restored later. */
1455 sigaddset (&blocked
, SIGINT
); sigaction (SIGINT
, 0, &sigint_action
);
1456 sigaddset (&blocked
, SIGQUIT
); sigaction (SIGQUIT
, 0, &sigquit_action
);
1458 sigaddset (&blocked
, SIGHUP
); sigaction (SIGHUP
, 0, &sighup_action
);
1460 #endif /* HAVE_VFORK */
1461 sigprocmask (SIG_BLOCK
, &blocked
, &procmask
);
1462 #else /* !POSIX_SIGNALS */
1466 #else /* not BSD4_1 */
1467 #if defined (BSD_SYSTEM) || defined (UNIPLUS) || defined (HPUX)
1468 sigsetmask (sigmask (SIGCHLD
));
1469 #else /* ordinary USG */
1471 sigchld_deferred
= 0;
1472 sigchld
= signal (SIGCHLD
, create_process_sigchld
);
1474 #endif /* ordinary USG */
1475 #endif /* not BSD4_1 */
1476 #endif /* SIGCHLD */
1477 #endif /* !POSIX_SIGNALS */
1479 FD_SET (inchannel
, &input_wait_mask
);
1480 FD_SET (inchannel
, &non_keyboard_wait_mask
);
1481 if (inchannel
> max_process_desc
)
1482 max_process_desc
= inchannel
;
1484 /* Until we store the proper pid, enable sigchld_handler
1485 to recognize an unknown pid as standing for this process.
1486 It is very important not to let this `marker' value stay
1487 in the table after this function has returned; if it does
1488 it might cause call-process to hang and subsequent asynchronous
1489 processes to get their return values scrambled. */
1490 XSETINT (XPROCESS (process
)->pid
, -1);
1495 /* child_setup must clobber environ on systems with true vfork.
1496 Protect it from permanent change. */
1497 char **save_environ
= environ
;
1499 current_dir
= ENCODE_FILE (current_dir
);
1504 #endif /* not WINDOWSNT */
1506 int xforkin
= forkin
;
1507 int xforkout
= forkout
;
1509 #if 0 /* This was probably a mistake--it duplicates code later on,
1510 but fails to handle all the cases. */
1511 /* Make sure SIGCHLD is not blocked in the child. */
1512 sigsetmask (SIGEMPTYMASK
);
1515 /* Make the pty be the controlling terminal of the process. */
1517 /* First, disconnect its current controlling terminal. */
1519 /* We tried doing setsid only if pty_flag, but it caused
1520 process_set_signal to fail on SGI when using a pipe. */
1522 /* Make the pty's terminal the controlling terminal. */
1526 /* We ignore the return value
1527 because faith@cs.unc.edu says that is necessary on Linux. */
1528 ioctl (xforkin
, TIOCSCTTY
, 0);
1531 #else /* not HAVE_SETSID */
1533 /* It's very important to call setpgrp here and no time
1534 afterwards. Otherwise, we lose our controlling tty which
1535 is set when we open the pty. */
1538 #endif /* not HAVE_SETSID */
1539 #if defined (HAVE_TERMIOS) && defined (LDISC1)
1540 if (pty_flag
&& xforkin
>= 0)
1543 tcgetattr (xforkin
, &t
);
1545 if (tcsetattr (xforkin
, TCSANOW
, &t
) < 0)
1546 emacs_write (1, "create_process/tcsetattr LDISC1 failed\n", 39);
1549 #if defined (NTTYDISC) && defined (TIOCSETD)
1550 if (pty_flag
&& xforkin
>= 0)
1552 /* Use new line discipline. */
1553 int ldisc
= NTTYDISC
;
1554 ioctl (xforkin
, TIOCSETD
, &ldisc
);
1559 /* In 4.3BSD, the TIOCSPGRP bug has been fixed, and now you
1560 can do TIOCSPGRP only to the process's controlling tty. */
1563 /* I wonder: would just ioctl (0, TIOCNOTTY, 0) work here?
1564 I can't test it since I don't have 4.3. */
1565 int j
= emacs_open ("/dev/tty", O_RDWR
, 0);
1566 ioctl (j
, TIOCNOTTY
, 0);
1569 /* In order to get a controlling terminal on some versions
1570 of BSD, it is necessary to put the process in pgrp 0
1571 before it opens the terminal. */
1579 #endif /* TIOCNOTTY */
1581 #if !defined (RTU) && !defined (UNIPLUS) && !defined (DONT_REOPEN_PTY)
1582 /*** There is a suggestion that this ought to be a
1583 conditional on TIOCSPGRP,
1584 or !(defined (HAVE_SETSID) && defined (TIOCSCTTY)).
1585 Trying the latter gave the wrong results on Debian GNU/Linux 1.1;
1586 that system does seem to need this code, even though
1587 both HAVE_SETSID and TIOCSCTTY are defined. */
1588 /* Now close the pty (if we had it open) and reopen it.
1589 This makes the pty the controlling terminal of the subprocess. */
1592 #ifdef SET_CHILD_PTY_PGRP
1593 int pgrp
= getpid ();
1596 /* I wonder if emacs_close (emacs_open (pty_name, ...))
1599 emacs_close (xforkin
);
1600 xforkout
= xforkin
= emacs_open (pty_name
, O_RDWR
, 0);
1604 emacs_write (1, "Couldn't open the pty terminal ", 31);
1605 emacs_write (1, pty_name
, strlen (pty_name
));
1606 emacs_write (1, "\n", 1);
1610 #ifdef SET_CHILD_PTY_PGRP
1611 ioctl (xforkin
, TIOCSPGRP
, &pgrp
);
1612 ioctl (xforkout
, TIOCSPGRP
, &pgrp
);
1615 #endif /* not UNIPLUS and not RTU and not DONT_REOPEN_PTY */
1617 #ifdef SETUP_SLAVE_PTY
1622 #endif /* SETUP_SLAVE_PTY */
1624 /* On AIX, we've disabled SIGHUP above once we start a child on a pty.
1625 Now reenable it in the child, so it will die when we want it to. */
1627 signal (SIGHUP
, SIG_DFL
);
1629 #endif /* HAVE_PTYS */
1631 signal (SIGINT
, SIG_DFL
);
1632 signal (SIGQUIT
, SIG_DFL
);
1634 /* Stop blocking signals in the child. */
1635 #ifdef POSIX_SIGNALS
1636 sigprocmask (SIG_SETMASK
, &procmask
, 0);
1637 #else /* !POSIX_SIGNALS */
1641 #else /* not BSD4_1 */
1642 #if defined (BSD_SYSTEM) || defined (UNIPLUS) || defined (HPUX)
1643 sigsetmask (SIGEMPTYMASK
);
1644 #else /* ordinary USG */
1646 signal (SIGCHLD
, sigchld
);
1648 #endif /* ordinary USG */
1649 #endif /* not BSD4_1 */
1650 #endif /* SIGCHLD */
1651 #endif /* !POSIX_SIGNALS */
1654 child_setup_tty (xforkout
);
1656 pid
= child_setup (xforkin
, xforkout
, xforkout
,
1657 new_argv
, 1, current_dir
);
1658 #else /* not WINDOWSNT */
1659 child_setup (xforkin
, xforkout
, xforkout
,
1660 new_argv
, 1, current_dir
);
1661 #endif /* not WINDOWSNT */
1663 environ
= save_environ
;
1668 /* This runs in the Emacs process. */
1672 emacs_close (forkin
);
1673 if (forkin
!= forkout
&& forkout
>= 0)
1674 emacs_close (forkout
);
1678 /* vfork succeeded. */
1679 XSETFASTINT (XPROCESS (process
)->pid
, pid
);
1682 register_child (pid
, inchannel
);
1683 #endif /* WINDOWSNT */
1685 /* If the subfork execv fails, and it exits,
1686 this close hangs. I don't know why.
1687 So have an interrupt jar it loose. */
1689 signal (SIGALRM
, create_process_1
);
1691 XPROCESS (process
)->subtty
= Qnil
;
1693 emacs_close (forkin
);
1696 if (forkin
!= forkout
&& forkout
>= 0)
1697 emacs_close (forkout
);
1701 XPROCESS (process
)->tty_name
= build_string (pty_name
);
1704 XPROCESS (process
)->tty_name
= Qnil
;
1707 /* Restore the signal state whether vfork succeeded or not.
1708 (We will signal an error, below, if it failed.) */
1709 #ifdef POSIX_SIGNALS
1711 /* Restore the parent's signal handlers. */
1712 sigaction (SIGINT
, &sigint_action
, 0);
1713 sigaction (SIGQUIT
, &sigquit_action
, 0);
1715 sigaction (SIGHUP
, &sighup_action
, 0);
1717 #endif /* HAVE_VFORK */
1718 /* Stop blocking signals in the parent. */
1719 sigprocmask (SIG_SETMASK
, &procmask
, 0);
1720 #else /* !POSIX_SIGNALS */
1724 #else /* not BSD4_1 */
1725 #if defined (BSD_SYSTEM) || defined (UNIPLUS) || defined (HPUX)
1726 sigsetmask (SIGEMPTYMASK
);
1727 #else /* ordinary USG */
1729 signal (SIGCHLD
, sigchld
);
1730 /* Now really handle any of these signals
1731 that came in during this function. */
1732 if (sigchld_deferred
)
1733 kill (getpid (), SIGCHLD
);
1735 #endif /* ordinary USG */
1736 #endif /* not BSD4_1 */
1737 #endif /* SIGCHLD */
1738 #endif /* !POSIX_SIGNALS */
1740 /* Now generate the error if vfork failed. */
1742 report_file_error ("Doing vfork", Qnil
);
1744 #endif /* not VMS */
1748 /* open a TCP network connection to a given HOST/SERVICE. Treated
1749 exactly like a normal process when reading and writing. Only
1750 differences are in status display and process deletion. A network
1751 connection has no PID; you cannot signal it. All you can do is
1752 deactivate and close it via delete-process */
1754 DEFUN ("open-network-stream", Fopen_network_stream
, Sopen_network_stream
,
1756 "Open a TCP connection for a service to a host.\n\
1757 Returns a subprocess-object to represent the connection.\n\
1758 Input and output work as for subprocesses; `delete-process' closes it.\n\
1759 Args are NAME BUFFER HOST SERVICE.\n\
1760 NAME is name for process. It is modified if necessary to make it unique.\n\
1761 BUFFER is the buffer (or buffer-name) to associate with the process.\n\
1762 Process output goes at end of that buffer, unless you specify\n\
1763 an output stream or filter function to handle the output.\n\
1764 BUFFER may be also nil, meaning that this process is not associated\n\
1766 Third arg is name of the host to connect to, or its IP address.\n\
1767 Fourth arg SERVICE is name of the service desired, or an integer\n\
1768 specifying a port number to connect to.")
1769 (name
, buffer
, host
, service
)
1770 Lisp_Object name
, buffer
, host
, service
;
1773 #ifndef HAVE_GETADDRINFO
1774 struct sockaddr_in address
;
1775 struct servent
*svc_info
;
1776 struct hostent
*host_info_ptr
, host_info
;
1777 char *(addr_list
[2]);
1778 IN_ADDR numeric_addr
;
1780 #else /* HAVE_GETADDRINFO */
1781 struct addrinfo hints
, *res
, *lres
;
1784 char *portstring
, portbuf
[128];
1785 #endif /* HAVE_GETADDRINFO */
1786 int s
= -1, outch
, inch
;
1787 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
;
1789 int count
= specpdl_ptr
- specpdl
;
1793 /* Ensure socket support is loaded if available. */
1794 init_winsock (TRUE
);
1797 GCPRO4 (name
, buffer
, host
, service
);
1798 CHECK_STRING (name
, 0);
1799 CHECK_STRING (host
, 0);
1801 #ifdef HAVE_GETADDRINFO
1803 * SERVICE can either be a string or int.
1804 * Convert to a C string for later use by getaddrinfo.
1806 if (INTEGERP (service
))
1808 sprintf (portbuf
, "%d", XINT (service
));
1809 portstring
= portbuf
;
1813 CHECK_STRING (service
, 0);
1814 portstring
= XSTRING (service
)->data
;
1816 #else /* ! HAVE_GETADDRINFO */
1817 if (INTEGERP (service
))
1818 port
= htons ((unsigned short) XINT (service
));
1821 CHECK_STRING (service
, 0);
1822 svc_info
= getservbyname (XSTRING (service
)->data
, "tcp");
1824 error ("Unknown service \"%s\"", XSTRING (service
)->data
);
1825 port
= svc_info
->s_port
;
1827 #endif /* ! HAVE_GETADDRINFO */
1830 /* Slow down polling to every ten seconds.
1831 Some kernels have a bug which causes retrying connect to fail
1832 after a connect. Polling can interfere with gethostbyname too. */
1833 #ifdef POLL_FOR_INPUT
1834 bind_polling_period (10);
1838 #ifdef HAVE_GETADDRINFO
1842 memset (&hints
, 0, sizeof (hints
));
1844 hints
.ai_family
= AF_UNSPEC
;
1845 hints
.ai_socktype
= SOCK_STREAM
;
1846 hints
.ai_protocol
= 0;
1847 ret
= getaddrinfo (XSTRING (host
)->data
, portstring
, &hints
, &res
);
1850 error ("%s/%s %s", XSTRING (host
)->data
, portstring
,
1857 count1
= specpdl_ptr
- specpdl
;
1858 record_unwind_protect (close_file_unwind
, make_number (s
));
1860 for (lres
= res
; lres
; lres
= lres
->ai_next
)
1862 s
= socket (lres
->ai_family
, lres
->ai_socktype
, lres
->ai_protocol
);
1866 /* Kernel bugs (on Ultrix at least) cause lossage (not just EINTR)
1867 when connect is interrupted. So let's not let it get interrupted.
1868 Note we do not turn off polling, because polling is only used
1869 when not interrupt_input, and thus not normally used on the systems
1870 which have this bug. On systems which use polling, there's no way
1871 to quit if polling is turned off. */
1872 if (interrupt_input
)
1878 ret
= connect (s
, lres
->ai_addr
, lres
->ai_addrlen
);
1888 if (interrupt_input
)
1892 report_file_error ("connection failed",
1893 Fcons (host
, Fcons (name
, Qnil
)));
1895 #else /* ! HAVE_GETADDRINFO */
1906 host_info_ptr
= gethostbyname (XSTRING (host
)->data
);
1910 if (! (host_info_ptr
== 0 && h_errno
== TRY_AGAIN
))
1914 Fsleep_for (make_number (1), Qnil
);
1916 if (host_info_ptr
== 0)
1917 /* Attempt to interpret host as numeric inet address */
1919 numeric_addr
= inet_addr ((char *) XSTRING (host
)->data
);
1920 if (NUMERIC_ADDR_ERROR
)
1921 error ("Unknown host \"%s\"", XSTRING (host
)->data
);
1923 host_info_ptr
= &host_info
;
1924 host_info
.h_name
= 0;
1925 host_info
.h_aliases
= 0;
1926 host_info
.h_addrtype
= AF_INET
;
1928 /* Older machines have only one address slot called h_addr.
1929 Newer machines have h_addr_list, but #define h_addr to
1930 be its first element. */
1931 host_info
.h_addr_list
= &(addr_list
[0]);
1933 host_info
.h_addr
= (char*)(&numeric_addr
);
1935 /* numeric_addr isn't null-terminated; it has fixed length. */
1936 host_info
.h_length
= sizeof (numeric_addr
);
1939 bzero (&address
, sizeof address
);
1940 bcopy (host_info_ptr
->h_addr
, (char *) &address
.sin_addr
,
1941 host_info_ptr
->h_length
);
1942 address
.sin_family
= host_info_ptr
->h_addrtype
;
1943 address
.sin_port
= port
;
1945 s
= socket (host_info_ptr
->h_addrtype
, SOCK_STREAM
, 0);
1947 report_file_error ("error creating socket", Fcons (name
, Qnil
));
1949 count1
= specpdl_ptr
- specpdl
;
1950 record_unwind_protect (close_file_unwind
, make_number (s
));
1952 /* Kernel bugs (on Ultrix at least) cause lossage (not just EINTR)
1953 when connect is interrupted. So let's not let it get interrupted.
1954 Note we do not turn off polling, because polling is only used
1955 when not interrupt_input, and thus not normally used on the systems
1956 which have this bug. On systems which use polling, there's no way
1957 to quit if polling is turned off. */
1958 if (interrupt_input
)
1966 if (connect (s
, (struct sockaddr
*) &address
, sizeof address
) == -1
1967 && errno
!= EISCONN
)
1975 if (errno
== EADDRINUSE
&& retry
< 20)
1977 /* A delay here is needed on some FreeBSD systems,
1978 and it is harmless, since this retrying takes time anyway
1979 and should be infrequent. */
1980 Fsleep_for (make_number (1), Qnil
);
1985 /* Discard the unwind protect. */
1986 specpdl_ptr
= specpdl
+ count1
;
1990 if (interrupt_input
)
1994 report_file_error ("connection failed",
1995 Fcons (host
, Fcons (name
, Qnil
)));
1997 #endif /* ! HAVE_GETADDRINFO */
2001 /* Discard the unwind protect. */
2002 specpdl_ptr
= specpdl
+ count1
;
2004 #ifdef POLL_FOR_INPUT
2005 unbind_to (count
, Qnil
);
2008 if (interrupt_input
)
2012 s
= connect_server (0);
2014 report_file_error ("error creating socket", Fcons (name
, Qnil
));
2015 send_command (s
, C_PORT
, 0, "%s:%d", XSTRING (host
)->data
, ntohs (port
));
2016 send_command (s
, C_DUMB
, 1, 0);
2023 buffer
= Fget_buffer_create (buffer
);
2024 proc
= make_process (name
);
2026 chan_process
[inch
] = proc
;
2029 fcntl (inch
, F_SETFL
, O_NONBLOCK
);
2032 fcntl (inch
, F_SETFL
, O_NDELAY
);
2036 XPROCESS (proc
)->childp
= Fcons (host
, Fcons (service
, Qnil
));
2037 XPROCESS (proc
)->command_channel_p
= Qnil
;
2038 XPROCESS (proc
)->buffer
= buffer
;
2039 XPROCESS (proc
)->sentinel
= Qnil
;
2040 XPROCESS (proc
)->filter
= Qnil
;
2041 XPROCESS (proc
)->command
= Qnil
;
2042 XPROCESS (proc
)->pid
= Qnil
;
2043 XSETINT (XPROCESS (proc
)->infd
, inch
);
2044 XSETINT (XPROCESS (proc
)->outfd
, outch
);
2045 XPROCESS (proc
)->status
= Qrun
;
2046 FD_SET (inch
, &input_wait_mask
);
2047 FD_SET (inch
, &non_keyboard_wait_mask
);
2048 if (inch
> max_process_desc
)
2049 max_process_desc
= inch
;
2052 /* Setup coding systems for communicating with the network stream. */
2053 struct gcpro gcpro1
;
2054 /* Qt denotes we have not yet called Ffind_operation_coding_system. */
2055 Lisp_Object coding_systems
= Qt
;
2056 Lisp_Object args
[5], val
;
2058 if (!NILP (Vcoding_system_for_read
))
2059 val
= Vcoding_system_for_read
;
2060 else if ((!NILP (buffer
) && NILP (XBUFFER (buffer
)->enable_multibyte_characters
))
2061 || (NILP (buffer
) && NILP (buffer_defaults
.enable_multibyte_characters
)))
2062 /* We dare not decode end-of-line format by setting VAL to
2063 Qraw_text, because the existing Emacs Lisp libraries
2064 assume that they receive bare code including a sequene of
2069 args
[0] = Qopen_network_stream
, args
[1] = name
,
2070 args
[2] = buffer
, args
[3] = host
, args
[4] = service
;
2072 coding_systems
= Ffind_operation_coding_system (5, args
);
2074 if (CONSP (coding_systems
))
2075 val
= XCAR (coding_systems
);
2076 else if (CONSP (Vdefault_process_coding_system
))
2077 val
= XCAR (Vdefault_process_coding_system
);
2081 XPROCESS (proc
)->decode_coding_system
= val
;
2083 if (!NILP (Vcoding_system_for_write
))
2084 val
= Vcoding_system_for_write
;
2085 else if (NILP (current_buffer
->enable_multibyte_characters
))
2089 if (EQ (coding_systems
, Qt
))
2091 args
[0] = Qopen_network_stream
, args
[1] = name
,
2092 args
[2] = buffer
, args
[3] = host
, args
[4] = service
;
2094 coding_systems
= Ffind_operation_coding_system (5, args
);
2097 if (CONSP (coding_systems
))
2098 val
= XCDR (coding_systems
);
2099 else if (CONSP (Vdefault_process_coding_system
))
2100 val
= XCDR (Vdefault_process_coding_system
);
2104 XPROCESS (proc
)->encode_coding_system
= val
;
2107 if (!proc_decode_coding_system
[inch
])
2108 proc_decode_coding_system
[inch
]
2109 = (struct coding_system
*) xmalloc (sizeof (struct coding_system
));
2110 setup_coding_system (XPROCESS (proc
)->decode_coding_system
,
2111 proc_decode_coding_system
[inch
]);
2112 if (!proc_encode_coding_system
[outch
])
2113 proc_encode_coding_system
[outch
]
2114 = (struct coding_system
*) xmalloc (sizeof (struct coding_system
));
2115 setup_coding_system (XPROCESS (proc
)->encode_coding_system
,
2116 proc_encode_coding_system
[outch
]);
2118 XPROCESS (proc
)->decoding_buf
= make_uninit_string (0);
2119 XPROCESS (proc
)->decoding_carryover
= make_number (0);
2120 XPROCESS (proc
)->encoding_buf
= make_uninit_string (0);
2121 XPROCESS (proc
)->encoding_carryover
= make_number (0);
2123 XPROCESS (proc
)->inherit_coding_system_flag
2124 = (NILP (buffer
) || !inherit_process_coding_system
2130 #endif /* HAVE_SOCKETS */
2133 deactivate_process (proc
)
2136 register int inchannel
, outchannel
;
2137 register struct Lisp_Process
*p
= XPROCESS (proc
);
2139 inchannel
= XINT (p
->infd
);
2140 outchannel
= XINT (p
->outfd
);
2144 /* Beware SIGCHLD hereabouts. */
2145 flush_pending_output (inchannel
);
2148 VMS_PROC_STUFF
*get_vms_process_pointer (), *vs
;
2149 sys$
dassgn (outchannel
);
2150 vs
= get_vms_process_pointer (p
->pid
);
2152 give_back_vms_process_stuff (vs
);
2155 emacs_close (inchannel
);
2156 if (outchannel
>= 0 && outchannel
!= inchannel
)
2157 emacs_close (outchannel
);
2160 XSETINT (p
->infd
, -1);
2161 XSETINT (p
->outfd
, -1);
2162 chan_process
[inchannel
] = Qnil
;
2163 FD_CLR (inchannel
, &input_wait_mask
);
2164 FD_CLR (inchannel
, &non_keyboard_wait_mask
);
2165 if (inchannel
== max_process_desc
)
2168 /* We just closed the highest-numbered process input descriptor,
2169 so recompute the highest-numbered one now. */
2170 max_process_desc
= 0;
2171 for (i
= 0; i
< MAXDESC
; i
++)
2172 if (!NILP (chan_process
[i
]))
2173 max_process_desc
= i
;
2178 /* Close all descriptors currently in use for communication
2179 with subprocess. This is used in a newly-forked subprocess
2180 to get rid of irrelevant descriptors. */
2183 close_process_descs ()
2187 for (i
= 0; i
< MAXDESC
; i
++)
2189 Lisp_Object process
;
2190 process
= chan_process
[i
];
2191 if (!NILP (process
))
2193 int in
= XINT (XPROCESS (process
)->infd
);
2194 int out
= XINT (XPROCESS (process
)->outfd
);
2197 if (out
>= 0 && in
!= out
)
2204 DEFUN ("accept-process-output", Faccept_process_output
, Saccept_process_output
,
2206 "Allow any pending output from subprocesses to be read by Emacs.\n\
2207 It is read into the process' buffers or given to their filter functions.\n\
2208 Non-nil arg PROCESS means do not return until some output has been received\n\
2210 Non-nil second arg TIMEOUT and third arg TIMEOUT-MSECS are number of\n\
2211 seconds and microseconds to wait; return after that much time whether\n\
2212 or not there is input.\n\
2213 Return non-nil iff we received any output before the timeout expired.")
2214 (process
, timeout
, timeout_msecs
)
2215 register Lisp_Object process
, timeout
, timeout_msecs
;
2220 if (! NILP (process
))
2221 CHECK_PROCESS (process
, 0);
2223 if (! NILP (timeout_msecs
))
2225 CHECK_NUMBER (timeout_msecs
, 2);
2226 useconds
= XINT (timeout_msecs
);
2227 if (!INTEGERP (timeout
))
2228 XSETINT (timeout
, 0);
2231 int carry
= useconds
/ 1000000;
2233 XSETINT (timeout
, XINT (timeout
) + carry
);
2234 useconds
-= carry
* 1000000;
2236 /* I think this clause is necessary because C doesn't
2237 guarantee a particular rounding direction for negative
2241 XSETINT (timeout
, XINT (timeout
) - 1);
2242 useconds
+= 1000000;
2249 if (! NILP (timeout
))
2251 CHECK_NUMBER (timeout
, 1);
2252 seconds
= XINT (timeout
);
2253 if (seconds
< 0 || (seconds
== 0 && useconds
== 0))
2265 XSETFASTINT (process
, 0);
2268 (wait_reading_process_input (seconds
, useconds
, process
, 0)
2272 /* This variable is different from waiting_for_input in keyboard.c.
2273 It is used to communicate to a lisp process-filter/sentinel (via the
2274 function Fwaiting_for_user_input_p below) whether emacs was waiting
2275 for user-input when that process-filter was called.
2276 waiting_for_input cannot be used as that is by definition 0 when
2277 lisp code is being evalled.
2278 This is also used in record_asynch_buffer_change.
2279 For that purpose, this must be 0
2280 when not inside wait_reading_process_input. */
2281 static int waiting_for_user_input_p
;
2283 /* This is here so breakpoints can be put on it. */
2285 wait_reading_process_input_1 ()
2289 /* Read and dispose of subprocess output while waiting for timeout to
2290 elapse and/or keyboard input to be available.
2293 timeout in seconds, or
2294 zero for no limit, or
2295 -1 means gobble data immediately available but don't wait for any.
2298 an additional duration to wait, measured in microseconds.
2299 If this is nonzero and time_limit is 0, then the timeout
2300 consists of MICROSECS only.
2302 READ_KBD is a lisp value:
2303 0 to ignore keyboard input, or
2304 1 to return when input is available, or
2305 -1 meaning caller will actually read the input, so don't throw to
2306 the quit handler, or
2307 a cons cell, meaning wait until its car is non-nil
2308 (and gobble terminal input into the buffer if any arrives), or
2309 a process object, meaning wait until something arrives from that
2310 process. The return value is true iff we read some input from
2313 DO_DISPLAY != 0 means redisplay should be done to show subprocess
2314 output that arrives.
2316 If READ_KBD is a pointer to a struct Lisp_Process, then the
2317 function returns true iff we received input from that process
2318 before the timeout elapsed.
2319 Otherwise, return true iff we received input from any process. */
2322 wait_reading_process_input (time_limit
, microsecs
, read_kbd
, do_display
)
2323 int time_limit
, microsecs
;
2324 Lisp_Object read_kbd
;
2327 register int channel
, nfds
;
2328 static SELECT_TYPE Available
;
2331 EMACS_TIME timeout
, end_time
;
2333 int wait_channel
= -1;
2334 struct Lisp_Process
*wait_proc
= 0;
2335 int got_some_input
= 0;
2336 Lisp_Object
*wait_for_cell
= 0;
2338 FD_ZERO (&Available
);
2340 /* If read_kbd is a process to watch, set wait_proc and wait_channel
2342 if (PROCESSP (read_kbd
))
2344 wait_proc
= XPROCESS (read_kbd
);
2345 wait_channel
= XINT (wait_proc
->infd
);
2346 XSETFASTINT (read_kbd
, 0);
2349 /* If waiting for non-nil in a cell, record where. */
2350 if (CONSP (read_kbd
))
2352 wait_for_cell
= &XCAR (read_kbd
);
2353 XSETFASTINT (read_kbd
, 0);
2356 waiting_for_user_input_p
= XINT (read_kbd
);
2358 /* Since we may need to wait several times,
2359 compute the absolute time to return at. */
2360 if (time_limit
|| microsecs
)
2362 EMACS_GET_TIME (end_time
);
2363 EMACS_SET_SECS_USECS (timeout
, time_limit
, microsecs
);
2364 EMACS_ADD_TIME (end_time
, end_time
, timeout
);
2367 /* AlainF 5-Jul-1996
2368 HP-UX 10.10 seem to have problems with signals coming in
2369 Causes "poll: interrupted system call" messages when Emacs is run
2371 Turn off periodic alarms (in case they are in use) */
2377 int timeout_reduced_for_timers
= 0;
2379 #ifdef HAVE_X_WINDOWS
2380 if (display_busy_cursor_p
)
2381 Fx_hide_busy_cursor (Qnil
);
2384 /* If calling from keyboard input, do not quit
2385 since we want to return C-g as an input character.
2386 Otherwise, do pending quit if requested. */
2387 if (XINT (read_kbd
) >= 0)
2390 /* Exit now if the cell we're waiting for became non-nil. */
2391 if (wait_for_cell
&& ! NILP (*wait_for_cell
))
2394 /* Compute time from now till when time limit is up */
2395 /* Exit if already run out */
2396 if (time_limit
== -1)
2398 /* -1 specified for timeout means
2399 gobble output available now
2400 but don't wait at all. */
2402 EMACS_SET_SECS_USECS (timeout
, 0, 0);
2404 else if (time_limit
|| microsecs
)
2406 EMACS_GET_TIME (timeout
);
2407 EMACS_SUB_TIME (timeout
, end_time
, timeout
);
2408 if (EMACS_TIME_NEG_P (timeout
))
2413 EMACS_SET_SECS_USECS (timeout
, 100000, 0);
2416 /* Normally we run timers here.
2417 But not if wait_for_cell; in those cases,
2418 the wait is supposed to be short,
2419 and those callers cannot handle running arbitrary Lisp code here. */
2420 if (! wait_for_cell
)
2422 EMACS_TIME timer_delay
;
2426 old_timers_run
= timers_run
;
2427 timer_delay
= timer_check (1);
2428 if (timers_run
!= old_timers_run
&& do_display
)
2430 redisplay_preserve_echo_area ();
2431 /* We must retry, since a timer may have requeued itself
2432 and that could alter the time_delay. */
2436 /* If there is unread keyboard input, also return. */
2437 if (XINT (read_kbd
) != 0
2438 && requeued_events_pending_p ())
2441 if (! EMACS_TIME_NEG_P (timer_delay
) && time_limit
!= -1)
2443 EMACS_TIME difference
;
2444 EMACS_SUB_TIME (difference
, timer_delay
, timeout
);
2445 if (EMACS_TIME_NEG_P (difference
))
2447 timeout
= timer_delay
;
2448 timeout_reduced_for_timers
= 1;
2451 /* If time_limit is -1, we are not going to wait at all. */
2452 else if (time_limit
!= -1)
2454 /* This is so a breakpoint can be put here. */
2455 wait_reading_process_input_1 ();
2459 /* Cause C-g and alarm signals to take immediate action,
2460 and cause input available signals to zero out timeout.
2462 It is important that we do this before checking for process
2463 activity. If we get a SIGCHLD after the explicit checks for
2464 process activity, timeout is the only way we will know. */
2465 if (XINT (read_kbd
) < 0)
2466 set_waiting_for_input (&timeout
);
2468 /* If status of something has changed, and no input is
2469 available, notify the user of the change right away. After
2470 this explicit check, we'll let the SIGCHLD handler zap
2471 timeout to get our attention. */
2472 if (update_tick
!= process_tick
&& do_display
)
2474 Atemp
= input_wait_mask
;
2475 EMACS_SET_SECS_USECS (timeout
, 0, 0);
2476 if ((select (max (max_process_desc
, max_keyboard_desc
) + 1,
2477 &Atemp
, (SELECT_TYPE
*)0, (SELECT_TYPE
*)0,
2481 /* It's okay for us to do this and then continue with
2482 the loop, since timeout has already been zeroed out. */
2483 clear_waiting_for_input ();
2488 /* Don't wait for output from a non-running process. */
2489 if (wait_proc
!= 0 && !NILP (wait_proc
->raw_status_low
))
2490 update_status (wait_proc
);
2492 && ! EQ (wait_proc
->status
, Qrun
))
2494 int nread
, total_nread
= 0;
2496 clear_waiting_for_input ();
2497 XSETPROCESS (proc
, wait_proc
);
2499 /* Read data from the process, until we exhaust it. */
2500 while (XINT (wait_proc
->infd
) >= 0)
2502 nread
= read_process_output (proc
, XINT (wait_proc
->infd
));
2508 total_nread
+= nread
;
2510 else if (nread
== -1 && EIO
== errno
)
2514 else if (nread
== -1 && EAGAIN
== errno
)
2518 else if (nread
== -1 && EWOULDBLOCK
== errno
)
2522 if (total_nread
> 0 && do_display
)
2523 redisplay_preserve_echo_area ();
2528 /* Wait till there is something to do */
2531 Available
= non_process_wait_mask
;
2532 else if (! XINT (read_kbd
))
2533 Available
= non_keyboard_wait_mask
;
2535 Available
= input_wait_mask
;
2537 /* If frame size has changed or the window is newly mapped,
2538 redisplay now, before we start to wait. There is a race
2539 condition here; if a SIGIO arrives between now and the select
2540 and indicates that a frame is trashed, the select may block
2541 displaying a trashed screen. */
2542 if (frame_garbaged
&& do_display
)
2544 clear_waiting_for_input ();
2545 redisplay_preserve_echo_area ();
2546 if (XINT (read_kbd
) < 0)
2547 set_waiting_for_input (&timeout
);
2550 if (XINT (read_kbd
) && detect_input_pending ())
2553 FD_ZERO (&Available
);
2556 nfds
= select (max (max_process_desc
, max_keyboard_desc
) + 1,
2557 &Available
, (SELECT_TYPE
*)0, (SELECT_TYPE
*)0,
2562 /* Make C-g and alarm signals set flags again */
2563 clear_waiting_for_input ();
2565 /* If we woke up due to SIGWINCH, actually change size now. */
2566 do_pending_window_change (0);
2568 if (time_limit
&& nfds
== 0 && ! timeout_reduced_for_timers
)
2569 /* We wanted the full specified time, so return now. */
2573 if (xerrno
== EINTR
)
2574 FD_ZERO (&Available
);
2576 /* Ultrix select seems to return ENOMEM when it is
2577 interrupted. Treat it just like EINTR. Bleah. Note
2578 that we want to test for the "ultrix" CPP symbol, not
2579 "__ultrix__"; the latter is only defined under GCC, but
2580 not by DEC's bundled CC. -JimB */
2581 else if (xerrno
== ENOMEM
)
2582 FD_ZERO (&Available
);
2585 /* This happens for no known reason on ALLIANT.
2586 I am guessing that this is the right response. -- RMS. */
2587 else if (xerrno
== EFAULT
)
2588 FD_ZERO (&Available
);
2590 else if (xerrno
== EBADF
)
2593 /* AIX doesn't handle PTY closure the same way BSD does. On AIX,
2594 the child's closure of the pts gives the parent a SIGHUP, and
2595 the ptc file descriptor is automatically closed,
2596 yielding EBADF here or at select() call above.
2597 So, SIGHUP is ignored (see def of PTY_TTY_NAME_SPRINTF
2598 in m/ibmrt-aix.h), and here we just ignore the select error.
2599 Cleanup occurs c/o status_notify after SIGCLD. */
2600 FD_ZERO (&Available
); /* Cannot depend on values returned */
2606 error ("select error: %s", emacs_strerror (xerrno
));
2608 #if defined(sun) && !defined(USG5_4)
2609 else if (nfds
> 0 && keyboard_bit_set (&Available
)
2611 /* System sometimes fails to deliver SIGIO.
2613 David J. Mackenzie says that Emacs doesn't compile under
2614 Solaris if this code is enabled, thus the USG5_4 in the CPP
2615 conditional. "I haven't noticed any ill effects so far.
2616 If you find a Solaris expert somewhere, they might know
2618 kill (getpid (), SIGIO
);
2621 #if 0 /* When polling is used, interrupt_input is 0,
2622 so get_input_pending should read the input.
2623 So this should not be needed. */
2624 /* If we are using polling for input,
2625 and we see input available, make it get read now.
2626 Otherwise it might not actually get read for a second.
2627 And on hpux, since we turn off polling in wait_reading_process_input,
2628 it might never get read at all if we don't spend much time
2629 outside of wait_reading_process_input. */
2630 if (XINT (read_kbd
) && interrupt_input
2631 && keyboard_bit_set (&Available
)
2632 && input_polling_used ())
2633 kill (getpid (), SIGALRM
);
2636 /* Check for keyboard input */
2637 /* If there is any, return immediately
2638 to give it higher priority than subprocesses */
2640 if (XINT (read_kbd
) != 0
2641 && detect_input_pending_run_timers (do_display
))
2643 swallow_events (do_display
);
2644 if (detect_input_pending_run_timers (do_display
))
2648 /* If there is unread keyboard input, also return. */
2649 if (XINT (read_kbd
) != 0
2650 && requeued_events_pending_p ())
2653 /* If we are not checking for keyboard input now,
2654 do process events (but don't run any timers).
2655 This is so that X events will be processed.
2656 Otherwise they may have to wait until polling takes place.
2657 That would causes delays in pasting selections, for example.
2659 (We used to do this only if wait_for_cell.) */
2660 if (XINT (read_kbd
) == 0 && detect_input_pending ())
2662 swallow_events (do_display
);
2663 #if 0 /* Exiting when read_kbd doesn't request that seems wrong, though. */
2664 if (detect_input_pending ())
2669 /* Exit now if the cell we're waiting for became non-nil. */
2670 if (wait_for_cell
&& ! NILP (*wait_for_cell
))
2674 /* If we think we have keyboard input waiting, but didn't get SIGIO,
2675 go read it. This can happen with X on BSD after logging out.
2676 In that case, there really is no input and no SIGIO,
2677 but select says there is input. */
2679 if (XINT (read_kbd
) && interrupt_input
2680 && keyboard_bit_set (&Available
))
2681 kill (getpid (), SIGIO
);
2685 got_some_input
|= nfds
> 0;
2687 /* If checking input just got us a size-change event from X,
2688 obey it now if we should. */
2689 if (XINT (read_kbd
) || wait_for_cell
)
2690 do_pending_window_change (0);
2692 /* Check for data from a process. */
2693 /* Really FIRST_PROC_DESC should be 0 on Unix,
2694 but this is safer in the short run. */
2695 for (channel
= 0; channel
<= max_process_desc
; channel
++)
2697 if (FD_ISSET (channel
, &Available
)
2698 && FD_ISSET (channel
, &non_keyboard_wait_mask
))
2702 /* If waiting for this channel, arrange to return as
2703 soon as no more input to be processed. No more
2705 if (wait_channel
== channel
)
2711 proc
= chan_process
[channel
];
2715 /* Read data from the process, starting with our
2716 buffered-ahead character if we have one. */
2718 nread
= read_process_output (proc
, channel
);
2721 /* Since read_process_output can run a filter,
2722 which can call accept-process-output,
2723 don't try to read from any other processes
2724 before doing the select again. */
2725 FD_ZERO (&Available
);
2728 redisplay_preserve_echo_area ();
2731 else if (nread
== -1 && errno
== EWOULDBLOCK
)
2734 /* ISC 4.1 defines both EWOULDBLOCK and O_NONBLOCK,
2735 and Emacs uses O_NONBLOCK, so what we get is EAGAIN. */
2737 else if (nread
== -1 && errno
== EAGAIN
)
2741 else if (nread
== -1 && errno
== EAGAIN
)
2743 /* Note that we cannot distinguish between no input
2744 available now and a closed pipe.
2745 With luck, a closed pipe will be accompanied by
2746 subprocess termination and SIGCHLD. */
2747 else if (nread
== 0 && !NETCONN_P (proc
))
2749 #endif /* O_NDELAY */
2750 #endif /* O_NONBLOCK */
2752 /* On some OSs with ptys, when the process on one end of
2753 a pty exits, the other end gets an error reading with
2754 errno = EIO instead of getting an EOF (0 bytes read).
2755 Therefore, if we get an error reading and errno =
2756 EIO, just continue, because the child process has
2757 exited and should clean itself up soon (e.g. when we
2760 However, it has been known to happen that the SIGCHLD
2761 got lost. So raise the signl again just in case.
2763 else if (nread
== -1 && errno
== EIO
)
2764 kill (getpid (), SIGCHLD
);
2765 #endif /* HAVE_PTYS */
2766 /* If we can detect process termination, don't consider the process
2767 gone just because its pipe is closed. */
2769 else if (nread
== 0 && !NETCONN_P (proc
))
2774 /* Preserve status of processes already terminated. */
2775 XSETINT (XPROCESS (proc
)->tick
, ++process_tick
);
2776 deactivate_process (proc
);
2777 if (!NILP (XPROCESS (proc
)->raw_status_low
))
2778 update_status (XPROCESS (proc
));
2779 if (EQ (XPROCESS (proc
)->status
, Qrun
))
2780 XPROCESS (proc
)->status
2781 = Fcons (Qexit
, Fcons (make_number (256), Qnil
));
2784 } /* end for each file descriptor */
2785 } /* end while exit conditions not met */
2787 waiting_for_user_input_p
= 0;
2789 /* If calling from keyboard input, do not quit
2790 since we want to return C-g as an input character.
2791 Otherwise, do pending quit if requested. */
2792 if (XINT (read_kbd
) >= 0)
2794 /* Prevent input_pending from remaining set if we quit. */
2795 clear_input_pending ();
2799 /* AlainF 5-Jul-1996
2800 HP-UX 10.10 seems to have problems with signals coming in
2801 Causes "poll: interrupted system call" messages when Emacs is run
2803 Turn periodic alarms back on */
2807 #ifdef HAVE_X_WINDOWS
2808 if (display_busy_cursor_p
)
2809 if (!inhibit_busy_cursor
)
2810 Fx_show_busy_cursor ();
2813 return got_some_input
;
2816 /* Given a list (FUNCTION ARGS...), apply FUNCTION to the ARGS. */
2819 read_process_output_call (fun_and_args
)
2820 Lisp_Object fun_and_args
;
2822 return apply1 (XCAR (fun_and_args
), XCDR (fun_and_args
));
2826 read_process_output_error_handler (error
)
2829 cmd_error_internal (error
, "error in process filter: ");
2831 update_echo_area ();
2832 Fsleep_for (make_number (2), Qnil
);
2835 /* Read pending output from the process channel,
2836 starting with our buffered-ahead character if we have one.
2837 Yield number of decoded characters read.
2839 This function reads at most 1024 characters.
2840 If you want to read all available subprocess output,
2841 you must call it repeatedly until it returns zero.
2843 The characters read are decoded according to PROC's coding-system
2847 read_process_output (proc
, channel
)
2849 register int channel
;
2851 register int nchars
, nbytes
;
2854 int chars_allocated
= 0; /* If 1, `chars' should be freed later. */
2858 register Lisp_Object outstream
;
2859 register struct buffer
*old
= current_buffer
;
2860 register struct Lisp_Process
*p
= XPROCESS (proc
);
2861 register int opoint
;
2862 struct coding_system
*coding
= proc_decode_coding_system
[channel
];
2863 int chars_in_decoding_buf
= 0; /* If 1, `chars' points
2864 XSTRING (p->decoding_buf)->data. */
2865 int carryover
= XINT (p
->decoding_carryover
);
2868 VMS_PROC_STUFF
*vs
, *get_vms_process_pointer();
2870 vs
= get_vms_process_pointer (p
->pid
);
2874 return (0); /* Really weird if it does this */
2875 if (!(vs
->iosb
[0] & 1))
2876 return -1; /* I/O error */
2879 error ("Could not get VMS process pointer");
2880 chars
= vs
->inputBuffer
;
2881 nbytes
= clean_vms_buffer (chars
, vs
->iosb
[1]);
2884 start_vms_process_read (vs
); /* Crank up the next read on the process */
2885 return 1; /* Nothing worth printing, say we got 1 */
2889 /* The data carried over in the previous decoding (which are at
2890 the tail of decoding buffer) should be prepended to the new
2891 data read to decode all together. */
2892 char *buf
= (char *) xmalloc (nbytes
+ carryover
);
2894 bcopy (XSTRING (p
->decoding_buf
)->data
2895 + STRING_BYTES (XSTRING (p
->decoding_buf
)) - carryover
,
2897 bcopy (chars
, buf
+ carryover
, nbytes
);
2899 chars_allocated
= 1;
2904 /* See the comment above. */
2905 bcopy (XSTRING (p
->decoding_buf
)->data
2906 + STRING_BYTES (XSTRING (p
->decoding_buf
)) - carryover
,
2909 if (proc_buffered_char
[channel
] < 0)
2910 nbytes
= emacs_read (channel
, buf
+ carryover
, (sizeof buf
) - carryover
);
2913 buf
[carryover
] = proc_buffered_char
[channel
];
2914 proc_buffered_char
[channel
] = -1;
2915 nbytes
= emacs_read (channel
, buf
+ carryover
+ 1,
2916 (sizeof buf
) - carryover
- 1);
2920 nbytes
= nbytes
+ 1;
2923 #endif /* not VMS */
2925 XSETINT (p
->decoding_carryover
, 0);
2927 /* At this point, NBYTES holds number of characters just received
2928 (including the one in proc_buffered_char[channel]). */
2931 if (nbytes
< 0 || coding
->mode
& CODING_MODE_LAST_BLOCK
)
2933 coding
->mode
|= CODING_MODE_LAST_BLOCK
;
2936 /* Now set NBYTES how many bytes we must decode. */
2937 nbytes
+= carryover
;
2940 if (CODING_MAY_REQUIRE_DECODING (coding
))
2942 int require
= decoding_buffer_size (coding
, nbytes
);
2945 if (STRING_BYTES (XSTRING (p
->decoding_buf
)) < require
)
2946 p
->decoding_buf
= make_uninit_string (require
);
2947 result
= decode_coding (coding
, chars
, XSTRING (p
->decoding_buf
)->data
,
2948 nbytes
, STRING_BYTES (XSTRING (p
->decoding_buf
)));
2949 carryover
= nbytes
- coding
->consumed
;
2952 /* Copy the carryover bytes to the end of p->decoding_buf, to
2953 be processed on the next read. Since decoding_buffer_size
2954 asks for an extra amount of space beyond the maximum
2955 expected for the output, there should always be sufficient
2956 space for the carryover (which is by definition a sequence
2957 of bytes that was not long enough to be decoded, and thus
2958 has a bounded length). */
2959 if (STRING_BYTES (XSTRING (p
->decoding_buf
))
2960 < coding
->produced
+ carryover
)
2962 bcopy (chars
+ coding
->consumed
,
2963 XSTRING (p
->decoding_buf
)->data
2964 + STRING_BYTES (XSTRING (p
->decoding_buf
)) - carryover
,
2966 XSETINT (p
->decoding_carryover
, carryover
);
2969 /* A new coding system might be found by `decode_coding'. */
2970 if (!EQ (p
->decode_coding_system
, coding
->symbol
))
2972 p
->decode_coding_system
= coding
->symbol
;
2974 /* Don't call setup_coding_system for
2975 proc_decode_coding_system[channel] here. It is done in
2976 detect_coding called via decode_coding above. */
2978 /* If a coding system for encoding is not yet decided, we set
2979 it as the same as coding-system for decoding.
2981 But, before doing that we must check if
2982 proc_encode_coding_system[p->outfd] surely points to a
2983 valid memory because p->outfd will be changed once EOF is
2984 sent to the process. */
2985 if (NILP (p
->encode_coding_system
)
2986 && proc_encode_coding_system
[XINT (p
->outfd
)])
2988 p
->encode_coding_system
= coding
->symbol
;
2989 setup_coding_system (coding
->symbol
,
2990 proc_encode_coding_system
[XINT (p
->outfd
)]);
2995 /* Now we don't need the contents of `chars'. */
2996 if (chars_allocated
)
2999 if (coding
->produced
== 0)
3001 chars
= (char *) XSTRING (p
->decoding_buf
)->data
;
3002 nbytes
= coding
->produced
;
3003 nchars
= (coding
->fake_multibyte
3004 ? multibyte_chars_in_text (chars
, nbytes
)
3005 : coding
->produced_char
);
3006 chars_in_decoding_buf
= 1;
3011 if (chars_allocated
)
3013 /* Although we don't have to decode the received data, we
3014 must move it to an area which we don't have to free. */
3015 if (! STRINGP (p
->decoding_buf
)
3016 || STRING_BYTES (XSTRING (p
->decoding_buf
)) < nbytes
)
3017 p
->decoding_buf
= make_uninit_string (nbytes
);
3018 bcopy (chars
, XSTRING (p
->decoding_buf
)->data
, nbytes
);
3020 chars
= XSTRING (p
->decoding_buf
)->data
;
3021 chars_in_decoding_buf
= 1;
3024 nchars
= multibyte_chars_in_text (chars
, nbytes
);
3027 Vlast_coding_system_used
= coding
->symbol
;
3029 /* If the caller required, let the process associated buffer
3030 inherit the coding-system used to decode the process output. */
3031 if (! NILP (p
->inherit_coding_system_flag
)
3032 && !NILP (p
->buffer
) && !NILP (XBUFFER (p
->buffer
)->name
))
3034 struct buffer
*prev_buf
= current_buffer
;
3036 Fset_buffer (p
->buffer
);
3037 call1 (intern ("after-insert-file-set-buffer-file-coding-system"),
3038 make_number (nbytes
));
3039 set_buffer_internal (prev_buf
);
3042 /* Read and dispose of the process output. */
3043 outstream
= p
->filter
;
3044 if (!NILP (outstream
))
3046 /* We inhibit quit here instead of just catching it so that
3047 hitting ^G when a filter happens to be running won't screw
3049 int count
= specpdl_ptr
- specpdl
;
3050 Lisp_Object odeactivate
;
3051 Lisp_Object obuffer
, okeymap
;
3053 int outer_running_asynch_code
= running_asynch_code
;
3054 int waiting
= waiting_for_user_input_p
;
3056 /* No need to gcpro these, because all we do with them later
3057 is test them for EQness, and none of them should be a string. */
3058 odeactivate
= Vdeactivate_mark
;
3059 XSETBUFFER (obuffer
, current_buffer
);
3060 okeymap
= current_buffer
->keymap
;
3062 specbind (Qinhibit_quit
, Qt
);
3063 specbind (Qlast_nonmenu_event
, Qt
);
3065 /* In case we get recursively called,
3066 and we already saved the match data nonrecursively,
3067 save the same match data in safely recursive fashion. */
3068 if (outer_running_asynch_code
)
3071 /* Don't clobber the CURRENT match data, either! */
3072 tem
= Fmatch_data (Qnil
, Qnil
);
3073 restore_match_data ();
3074 record_unwind_protect (Fset_match_data
, Fmatch_data (Qnil
, Qnil
));
3075 Fset_match_data (tem
);
3078 /* For speed, if a search happens within this code,
3079 save the match data in a special nonrecursive fashion. */
3080 running_asynch_code
= 1;
3082 /* The multibyteness of a string given to the filter is decided
3083 by which coding system we used for decoding. */
3084 if (coding
->type
== coding_type_no_conversion
3085 || coding
->type
== coding_type_raw_text
)
3086 text
= make_unibyte_string (chars
, nbytes
);
3088 text
= make_multibyte_string (chars
, nchars
, nbytes
);
3090 internal_condition_case_1 (read_process_output_call
,
3092 Fcons (proc
, Fcons (text
, Qnil
))),
3093 !NILP (Vdebug_on_error
) ? Qnil
: Qerror
,
3094 read_process_output_error_handler
);
3096 /* If we saved the match data nonrecursively, restore it now. */
3097 restore_match_data ();
3098 running_asynch_code
= outer_running_asynch_code
;
3100 /* Handling the process output should not deactivate the mark. */
3101 Vdeactivate_mark
= odeactivate
;
3103 /* Restore waiting_for_user_input_p as it was
3104 when we were called, in case the filter clobbered it. */
3105 waiting_for_user_input_p
= waiting
;
3107 #if 0 /* Call record_asynch_buffer_change unconditionally,
3108 because we might have changed minor modes or other things
3109 that affect key bindings. */
3110 if (! EQ (Fcurrent_buffer (), obuffer
)
3111 || ! EQ (current_buffer
->keymap
, okeymap
))
3113 /* But do it only if the caller is actually going to read events.
3114 Otherwise there's no need to make him wake up, and it could
3115 cause trouble (for example it would make Fsit_for return). */
3116 if (waiting_for_user_input_p
== -1)
3117 record_asynch_buffer_change ();
3120 start_vms_process_read (vs
);
3122 unbind_to (count
, Qnil
);
3126 /* If no filter, write into buffer if it isn't dead. */
3127 if (!NILP (p
->buffer
) && !NILP (XBUFFER (p
->buffer
)->name
))
3129 Lisp_Object old_read_only
;
3130 int old_begv
, old_zv
;
3131 int old_begv_byte
, old_zv_byte
;
3132 Lisp_Object odeactivate
;
3133 int before
, before_byte
;
3136 odeactivate
= Vdeactivate_mark
;
3138 Fset_buffer (p
->buffer
);
3140 opoint_byte
= PT_BYTE
;
3141 old_read_only
= current_buffer
->read_only
;
3144 old_begv_byte
= BEGV_BYTE
;
3145 old_zv_byte
= ZV_BYTE
;
3147 current_buffer
->read_only
= Qnil
;
3149 /* Insert new output into buffer
3150 at the current end-of-output marker,
3151 thus preserving logical ordering of input and output. */
3152 if (XMARKER (p
->mark
)->buffer
)
3153 SET_PT_BOTH (clip_to_bounds (BEGV
, marker_position (p
->mark
), ZV
),
3154 clip_to_bounds (BEGV_BYTE
, marker_byte_position (p
->mark
),
3157 SET_PT_BOTH (ZV
, ZV_BYTE
);
3159 before_byte
= PT_BYTE
;
3161 /* If the output marker is outside of the visible region, save
3162 the restriction and widen. */
3163 if (! (BEGV
<= PT
&& PT
<= ZV
))
3166 if (NILP (current_buffer
->enable_multibyte_characters
))
3169 /* Insert before markers in case we are inserting where
3170 the buffer's mark is, and the user's next command is Meta-y. */
3171 if (chars_in_decoding_buf
)
3173 /* Since multibyteness of p->docoding_buf is corrupted, we
3174 can't use insert_from_string_before_markers. */
3177 temp_buf
= (char *) alloca (nbytes
);
3178 bcopy (XSTRING (p
->decoding_buf
)->data
, temp_buf
, nbytes
);
3179 insert_before_markers (temp_buf
, nbytes
);
3183 insert_1_both (chars
, nchars
, nbytes
, 0, 1, 1);
3184 signal_after_change (opoint
, 0, PT
- opoint
);
3185 update_compositions (opoint
, PT
, CHECK_BORDER
);
3187 set_marker_both (p
->mark
, p
->buffer
, PT
, PT_BYTE
);
3189 update_mode_lines
++;
3191 /* Make sure opoint and the old restrictions
3192 float ahead of any new text just as point would. */
3193 if (opoint
>= before
)
3195 opoint
+= PT
- before
;
3196 opoint_byte
+= PT_BYTE
- before_byte
;
3198 if (old_begv
> before
)
3200 old_begv
+= PT
- before
;
3201 old_begv_byte
+= PT_BYTE
- before_byte
;
3203 if (old_zv
>= before
)
3205 old_zv
+= PT
- before
;
3206 old_zv_byte
+= PT_BYTE
- before_byte
;
3209 /* If the restriction isn't what it should be, set it. */
3210 if (old_begv
!= BEGV
|| old_zv
!= ZV
)
3211 Fnarrow_to_region (make_number (old_begv
), make_number (old_zv
));
3213 /* Handling the process output should not deactivate the mark. */
3214 Vdeactivate_mark
= odeactivate
;
3216 current_buffer
->read_only
= old_read_only
;
3217 SET_PT_BOTH (opoint
, opoint_byte
);
3218 set_buffer_internal (old
);
3221 start_vms_process_read (vs
);
3226 DEFUN ("waiting-for-user-input-p", Fwaiting_for_user_input_p
, Swaiting_for_user_input_p
,
3228 "Returns non-nil if emacs is waiting for input from the user.\n\
3229 This is intended for use by asynchronous process output filters and sentinels.")
3232 return (waiting_for_user_input_p
? Qt
: Qnil
);
3235 /* Sending data to subprocess */
3237 jmp_buf send_process_frame
;
3240 send_process_trap ()
3246 longjmp (send_process_frame
, 1);
3249 /* Send some data to process PROC.
3250 BUF is the beginning of the data; LEN is the number of characters.
3251 OBJECT is the Lisp object that the data comes from.
3253 The data is encoded by PROC's coding-system for encoding before it
3254 is sent. But if the data ends at the middle of multi-byte
3255 representation, that incomplete sequence of bytes are sent without
3256 being encoded. Should we store them in a buffer to prepend them to
3257 the data send later? */
3260 send_process (proc
, buf
, len
, object
)
3261 volatile Lisp_Object proc
;
3266 /* Use volatile to protect variables from being clobbered by longjmp. */
3268 volatile unsigned char *procname
= XSTRING (XPROCESS (proc
)->name
)->data
;
3269 struct coding_system
*coding
;
3270 struct gcpro gcpro1
;
3271 int carryover
= XINT (XPROCESS (proc
)->encoding_carryover
);
3276 struct Lisp_Process
*p
= XPROCESS (proc
);
3277 VMS_PROC_STUFF
*vs
, *get_vms_process_pointer();
3280 if (! NILP (XPROCESS (proc
)->raw_status_low
))
3281 update_status (XPROCESS (proc
));
3282 if (! EQ (XPROCESS (proc
)->status
, Qrun
))
3283 error ("Process %s not running", procname
);
3284 if (XINT (XPROCESS (proc
)->outfd
) < 0)
3285 error ("Output file descriptor of %s is closed", procname
);
3287 coding
= proc_encode_coding_system
[XINT (XPROCESS (proc
)->outfd
)];
3288 Vlast_coding_system_used
= coding
->symbol
;
3290 if (CODING_REQUIRE_ENCODING (coding
))
3292 int require
= encoding_buffer_size (coding
, len
);
3294 unsigned char *temp_buf
= NULL
;
3296 /* Remember the offset of data because a string or a buffer may
3297 be relocated. Setting OFFSET to -1 means we don't have to
3298 care about relocation. */
3299 offset
= (BUFFERP (object
)
3300 ? BUF_PTR_BYTE_POS (XBUFFER (object
), buf
)
3302 ? buf
- XSTRING (object
)->data
3307 temp_buf
= (unsigned char *) xmalloc (len
+ carryover
);
3311 if (BUFFERP (object
))
3312 buf
= BUF_BYTE_ADDRESS (XBUFFER (object
), offset
);
3313 else if (STRINGP (object
))
3314 buf
= offset
+ XSTRING (object
)->data
;
3315 /* Now we don't have to care about relocation. */
3318 bcopy ((XSTRING (XPROCESS (proc
)->encoding_buf
)->data
3319 + STRING_BYTES (XSTRING (XPROCESS (proc
)->encoding_buf
))
3323 bcopy (buf
, temp_buf
+ carryover
, len
);
3327 if (STRING_BYTES (XSTRING (XPROCESS (proc
)->encoding_buf
)) < require
)
3329 XPROCESS (proc
)->encoding_buf
= make_uninit_string (require
);
3333 if (BUFFERP (object
))
3334 buf
= BUF_BYTE_ADDRESS (XBUFFER (object
), offset
);
3335 else if (STRINGP (object
))
3336 buf
= offset
+ XSTRING (object
)->data
;
3339 object
= XPROCESS (proc
)->encoding_buf
;
3340 encode_coding (coding
, buf
, XSTRING (object
)->data
,
3341 len
, STRING_BYTES (XSTRING (object
)));
3342 len
= coding
->produced
;
3343 buf
= XSTRING (object
)->data
;
3349 vs
= get_vms_process_pointer (p
->pid
);
3351 error ("Could not find this process: %x", p
->pid
);
3352 else if (write_to_vms_process (vs
, buf
, len
))
3356 if (pty_max_bytes
== 0)
3358 #if defined (HAVE_FPATHCONF) && defined (_PC_MAX_CANON)
3359 pty_max_bytes
= fpathconf (XFASTINT (XPROCESS (proc
)->outfd
),
3361 if (pty_max_bytes
< 0)
3362 pty_max_bytes
= 250;
3364 pty_max_bytes
= 250;
3366 /* Deduct one, to leave space for the eof. */
3370 if (!setjmp (send_process_frame
))
3374 SIGTYPE (*old_sigpipe
)();
3376 /* Decide how much data we can send in one batch.
3377 Long lines need to be split into multiple batches. */
3378 if (!NILP (XPROCESS (proc
)->pty_flag
))
3380 /* Starting this at zero is always correct when not the first iteration
3381 because the previous iteration ended by sending C-d.
3382 It may not be correct for the first iteration
3383 if a partial line was sent in a separate send_process call.
3384 If that proves worth handling, we need to save linepos
3385 in the process object. */
3387 unsigned char *ptr
= buf
;
3388 unsigned char *end
= buf
+ len
;
3390 /* Scan through this text for a line that is too long. */
3391 while (ptr
!= end
&& linepos
< pty_max_bytes
)
3399 /* If we found one, break the line there
3400 and put in a C-d to force the buffer through. */
3404 /* Send this batch, using one or more write calls. */
3407 old_sigpipe
= (SIGTYPE (*) ()) signal (SIGPIPE
, send_process_trap
);
3408 rv
= emacs_write (XINT (XPROCESS (proc
)->outfd
), buf
, this);
3409 signal (SIGPIPE
, old_sigpipe
);
3415 || errno
== EWOULDBLOCK
3421 /* Buffer is full. Wait, accepting input;
3422 that may allow the program
3423 to finish doing output and read more. */
3428 /* Running filters might relocate buffers or strings.
3429 Arrange to relocate BUF. */
3430 if (BUFFERP (object
))
3431 offset
= BUF_PTR_BYTE_POS (XBUFFER (object
), buf
);
3432 else if (STRINGP (object
))
3433 offset
= buf
- XSTRING (object
)->data
;
3435 XSETFASTINT (zero
, 0);
3436 #ifdef EMACS_HAS_USECS
3437 wait_reading_process_input (0, 20000, zero
, 0);
3439 wait_reading_process_input (1, 0, zero
, 0);
3442 if (BUFFERP (object
))
3443 buf
= BUF_BYTE_ADDRESS (XBUFFER (object
), offset
);
3444 else if (STRINGP (object
))
3445 buf
= offset
+ XSTRING (object
)->data
;
3450 /* This is a real error. */
3451 report_file_error ("writing to process", Fcons (proc
, Qnil
));
3458 /* If we sent just part of the string, put in an EOF
3459 to force it through, before we send the rest. */
3461 Fprocess_send_eof (proc
);
3466 XPROCESS (proc
)->raw_status_low
= Qnil
;
3467 XPROCESS (proc
)->raw_status_high
= Qnil
;
3468 XPROCESS (proc
)->status
= Fcons (Qexit
, Fcons (make_number (256), Qnil
));
3469 XSETINT (XPROCESS (proc
)->tick
, ++process_tick
);
3470 deactivate_process (proc
);
3472 error ("Error writing to process %s; closed it", procname
);
3474 error ("SIGPIPE raised on process %s; closed it", procname
);
3481 DEFUN ("process-send-region", Fprocess_send_region
, Sprocess_send_region
,
3483 "Send current contents of region as input to PROCESS.\n\
3484 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
3485 nil, indicating the current buffer's process.\n\
3486 Called from program, takes three arguments, PROCESS, START and END.\n\
3487 If the region is more than 500 characters long,\n\
3488 it is sent in several bunches. This may happen even for shorter regions.\n\
3489 Output from processes can arrive in between bunches.")
3490 (process
, start
, end
)
3491 Lisp_Object process
, start
, end
;
3496 proc
= get_process (process
);
3497 validate_region (&start
, &end
);
3499 if (XINT (start
) < GPT
&& XINT (end
) > GPT
)
3500 move_gap (XINT (start
));
3502 start1
= CHAR_TO_BYTE (XINT (start
));
3503 end1
= CHAR_TO_BYTE (XINT (end
));
3504 send_process (proc
, BYTE_POS_ADDR (start1
), end1
- start1
,
3505 Fcurrent_buffer ());
3510 DEFUN ("process-send-string", Fprocess_send_string
, Sprocess_send_string
,
3512 "Send PROCESS the contents of STRING as input.\n\
3513 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
3514 nil, indicating the current buffer's process.\n\
3515 If STRING is more than 500 characters long,\n\
3516 it is sent in several bunches. This may happen even for shorter strings.\n\
3517 Output from processes can arrive in between bunches.")
3519 Lisp_Object process
, string
;
3522 CHECK_STRING (string
, 1);
3523 proc
= get_process (process
);
3524 send_process (proc
, XSTRING (string
)->data
,
3525 STRING_BYTES (XSTRING (string
)), string
);
3529 DEFUN ("process-running-child-p", Fprocess_running_child_p
,
3530 Sprocess_running_child_p
, 0, 1, 0,
3531 "Return t if PROCESS has given the terminal to a child.\n\
3532 If the operating system does not make it possible to find out,\n\
3533 return t unconditionally.")
3535 Lisp_Object process
;
3537 /* Initialize in case ioctl doesn't exist or gives an error,
3538 in a way that will cause returning t. */
3541 struct Lisp_Process
*p
;
3543 proc
= get_process (process
);
3544 p
= XPROCESS (proc
);
3546 if (!EQ (p
->childp
, Qt
))
3547 error ("Process %s is not a subprocess",
3548 XSTRING (p
->name
)->data
);
3549 if (XINT (p
->infd
) < 0)
3550 error ("Process %s is not active",
3551 XSTRING (p
->name
)->data
);
3554 if (!NILP (p
->subtty
))
3555 ioctl (XFASTINT (p
->subtty
), TIOCGPGRP
, &gid
);
3557 ioctl (XINT (p
->infd
), TIOCGPGRP
, &gid
);
3558 #endif /* defined (TIOCGPGRP ) */
3560 if (gid
== XFASTINT (p
->pid
))
3565 /* send a signal number SIGNO to PROCESS.
3566 If CURRENT_GROUP is t, that means send to the process group
3567 that currently owns the terminal being used to communicate with PROCESS.
3568 This is used for various commands in shell mode.
3569 If CURRENT_GROUP is lambda, that means send to the process group
3570 that currently owns the terminal, but only if it is NOT the shell itself.
3572 If NOMSG is zero, insert signal-announcements into process's buffers
3575 If we can, we try to signal PROCESS by sending control characters
3576 down the pty. This allows us to signal inferiors who have changed
3577 their uid, for which killpg would return an EPERM error. */
3580 process_send_signal (process
, signo
, current_group
, nomsg
)
3581 Lisp_Object process
;
3583 Lisp_Object current_group
;
3587 register struct Lisp_Process
*p
;
3591 proc
= get_process (process
);
3592 p
= XPROCESS (proc
);
3594 if (!EQ (p
->childp
, Qt
))
3595 error ("Process %s is not a subprocess",
3596 XSTRING (p
->name
)->data
);
3597 if (XINT (p
->infd
) < 0)
3598 error ("Process %s is not active",
3599 XSTRING (p
->name
)->data
);
3601 if (NILP (p
->pty_flag
))
3602 current_group
= Qnil
;
3604 /* If we are using pgrps, get a pgrp number and make it negative. */
3605 if (!NILP (current_group
))
3607 #ifdef SIGNALS_VIA_CHARACTERS
3608 /* If possible, send signals to the entire pgrp
3609 by sending an input character to it. */
3611 /* TERMIOS is the latest and bestest, and seems most likely to
3612 work. If the system has it, use it. */
3619 tcgetattr (XINT (p
->infd
), &t
);
3620 send_process (proc
, &t
.c_cc
[VINTR
], 1, Qnil
);
3624 tcgetattr (XINT (p
->infd
), &t
);
3625 send_process (proc
, &t
.c_cc
[VQUIT
], 1, Qnil
);
3629 tcgetattr (XINT (p
->infd
), &t
);
3630 #if defined (VSWTCH) && !defined (PREFER_VSUSP)
3631 send_process (proc
, &t
.c_cc
[VSWTCH
], 1, Qnil
);
3633 send_process (proc
, &t
.c_cc
[VSUSP
], 1, Qnil
);
3638 #else /* ! HAVE_TERMIOS */
3640 /* On Berkeley descendants, the following IOCTL's retrieve the
3641 current control characters. */
3642 #if defined (TIOCGLTC) && defined (TIOCGETC)
3650 ioctl (XINT (p
->infd
), TIOCGETC
, &c
);
3651 send_process (proc
, &c
.t_intrc
, 1, Qnil
);
3654 ioctl (XINT (p
->infd
), TIOCGETC
, &c
);
3655 send_process (proc
, &c
.t_quitc
, 1, Qnil
);
3659 ioctl (XINT (p
->infd
), TIOCGLTC
, &lc
);
3660 send_process (proc
, &lc
.t_suspc
, 1, Qnil
);
3662 #endif /* ! defined (SIGTSTP) */
3665 #else /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
3667 /* On SYSV descendants, the TCGETA ioctl retrieves the current control
3674 ioctl (XINT (p
->infd
), TCGETA
, &t
);
3675 send_process (proc
, &t
.c_cc
[VINTR
], 1, Qnil
);
3678 ioctl (XINT (p
->infd
), TCGETA
, &t
);
3679 send_process (proc
, &t
.c_cc
[VQUIT
], 1, Qnil
);
3683 ioctl (XINT (p
->infd
), TCGETA
, &t
);
3684 send_process (proc
, &t
.c_cc
[VSWTCH
], 1, Qnil
);
3686 #endif /* ! defined (SIGTSTP) */
3688 #else /* ! defined (TCGETA) */
3689 Your configuration files are messed up
.
3690 /* If your system configuration files define SIGNALS_VIA_CHARACTERS,
3691 you'd better be using one of the alternatives above! */
3692 #endif /* ! defined (TCGETA) */
3693 #endif /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
3694 #endif /* ! defined HAVE_TERMIOS */
3695 #endif /* ! defined (SIGNALS_VIA_CHARACTERS) */
3698 /* Get the pgrp using the tty itself, if we have that.
3699 Otherwise, use the pty to get the pgrp.
3700 On pfa systems, saka@pfu.fujitsu.co.JP writes:
3701 "TIOCGPGRP symbol defined in sys/ioctl.h at E50.
3702 But, TIOCGPGRP does not work on E50 ;-P works fine on E60"
3703 His patch indicates that if TIOCGPGRP returns an error, then
3704 we should just assume that p->pid is also the process group id. */
3708 if (!NILP (p
->subtty
))
3709 err
= ioctl (XFASTINT (p
->subtty
), TIOCGPGRP
, &gid
);
3711 err
= ioctl (XINT (p
->infd
), TIOCGPGRP
, &gid
);
3715 gid
= - XFASTINT (p
->pid
);
3716 #endif /* ! defined (pfa) */
3722 #else /* ! defined (TIOCGPGRP ) */
3723 /* Can't select pgrps on this system, so we know that
3724 the child itself heads the pgrp. */
3725 gid
= - XFASTINT (p
->pid
);
3726 #endif /* ! defined (TIOCGPGRP ) */
3728 /* If current_group is lambda, and the shell owns the terminal,
3729 don't send any signal. */
3730 if (EQ (current_group
, Qlambda
) && gid
== - XFASTINT (p
->pid
))
3734 gid
= - XFASTINT (p
->pid
);
3740 p
->raw_status_low
= Qnil
;
3741 p
->raw_status_high
= Qnil
;
3743 XSETINT (p
->tick
, ++process_tick
);
3747 #endif /* ! defined (SIGCONT) */
3750 send_process (proc
, "\003", 1, Qnil
); /* ^C */
3755 send_process (proc
, "\031", 1, Qnil
); /* ^Y */
3760 sys$
forcex (&(XFASTINT (p
->pid
)), 0, 1);
3763 flush_pending_output (XINT (p
->infd
));
3767 /* If we don't have process groups, send the signal to the immediate
3768 subprocess. That isn't really right, but it's better than any
3769 obvious alternative. */
3772 kill (XFASTINT (p
->pid
), signo
);
3776 /* gid may be a pid, or minus a pgrp's number */
3778 if (!NILP (current_group
))
3779 ioctl (XINT (p
->infd
), TIOCSIGSEND
, signo
);
3782 gid
= - XFASTINT (p
->pid
);
3785 #else /* ! defined (TIOCSIGSEND) */
3786 EMACS_KILLPG (-gid
, signo
);
3787 #endif /* ! defined (TIOCSIGSEND) */
3790 DEFUN ("interrupt-process", Finterrupt_process
, Sinterrupt_process
, 0, 2, 0,
3791 "Interrupt process PROCESS.\n\
3792 PROCESS may be a process, a buffer, or the name of a process or buffer.\n\
3793 nil or no arg means current buffer's process.\n\
3794 Second arg CURRENT-GROUP non-nil means send signal to\n\
3795 the current process-group of the process's controlling terminal\n\
3796 rather than to the process's own process group.\n\
3797 If the process is a shell, this means interrupt current subjob\n\
3798 rather than the shell.\n\
3800 If CURRENT-GROUP is `lambda', and if the shell owns the terminal,\n\
3801 don't send the signal.")
3802 (process
, current_group
)
3803 Lisp_Object process
, current_group
;
3805 process_send_signal (process
, SIGINT
, current_group
, 0);
3809 DEFUN ("kill-process", Fkill_process
, Skill_process
, 0, 2, 0,
3810 "Kill process PROCESS. May be process or name of one.\n\
3811 See function `interrupt-process' for more details on usage.")
3812 (process
, current_group
)
3813 Lisp_Object process
, current_group
;
3815 process_send_signal (process
, SIGKILL
, current_group
, 0);
3819 DEFUN ("quit-process", Fquit_process
, Squit_process
, 0, 2, 0,
3820 "Send QUIT signal to process PROCESS. May be process or name of one.\n\
3821 See function `interrupt-process' for more details on usage.")
3822 (process
, current_group
)
3823 Lisp_Object process
, current_group
;
3825 process_send_signal (process
, SIGQUIT
, current_group
, 0);
3829 DEFUN ("stop-process", Fstop_process
, Sstop_process
, 0, 2, 0,
3830 "Stop process PROCESS. May be process or name of one.\n\
3831 See function `interrupt-process' for more details on usage.")
3832 (process
, current_group
)
3833 Lisp_Object process
, current_group
;
3836 error ("no SIGTSTP support");
3838 process_send_signal (process
, SIGTSTP
, current_group
, 0);
3843 DEFUN ("continue-process", Fcontinue_process
, Scontinue_process
, 0, 2, 0,
3844 "Continue process PROCESS. May be process or name of one.\n\
3845 See function `interrupt-process' for more details on usage.")
3846 (process
, current_group
)
3847 Lisp_Object process
, current_group
;
3850 process_send_signal (process
, SIGCONT
, current_group
, 0);
3852 error ("no SIGCONT support");
3857 DEFUN ("signal-process", Fsignal_process
, Ssignal_process
,
3858 2, 2, "nProcess number: \nnSignal code: ",
3859 "Send the process with process id PID the signal with code SIGCODE.\n\
3860 PID must be an integer. The process need not be a child of this Emacs.\n\
3861 SIGCODE may be an integer, or a symbol whose name is a signal name.")
3863 Lisp_Object pid
, sigcode
;
3865 CHECK_NUMBER (pid
, 0);
3867 #define handle_signal(NAME, VALUE) \
3868 else if (!strcmp (name, NAME)) \
3869 XSETINT (sigcode, VALUE)
3871 if (INTEGERP (sigcode
))
3875 unsigned char *name
;
3877 CHECK_SYMBOL (sigcode
, 1);
3878 name
= XSYMBOL (sigcode
)->name
->data
;
3883 handle_signal ("SIGHUP", SIGHUP
);
3886 handle_signal ("SIGINT", SIGINT
);
3889 handle_signal ("SIGQUIT", SIGQUIT
);
3892 handle_signal ("SIGILL", SIGILL
);
3895 handle_signal ("SIGABRT", SIGABRT
);
3898 handle_signal ("SIGEMT", SIGEMT
);
3901 handle_signal ("SIGKILL", SIGKILL
);
3904 handle_signal ("SIGFPE", SIGFPE
);
3907 handle_signal ("SIGBUS", SIGBUS
);
3910 handle_signal ("SIGSEGV", SIGSEGV
);
3913 handle_signal ("SIGSYS", SIGSYS
);
3916 handle_signal ("SIGPIPE", SIGPIPE
);
3919 handle_signal ("SIGALRM", SIGALRM
);
3922 handle_signal ("SIGTERM", SIGTERM
);
3925 handle_signal ("SIGURG", SIGURG
);
3928 handle_signal ("SIGSTOP", SIGSTOP
);
3931 handle_signal ("SIGTSTP", SIGTSTP
);
3934 handle_signal ("SIGCONT", SIGCONT
);
3937 handle_signal ("SIGCHLD", SIGCHLD
);
3940 handle_signal ("SIGTTIN", SIGTTIN
);
3943 handle_signal ("SIGTTOU", SIGTTOU
);
3946 handle_signal ("SIGIO", SIGIO
);
3949 handle_signal ("SIGXCPU", SIGXCPU
);
3952 handle_signal ("SIGXFSZ", SIGXFSZ
);
3955 handle_signal ("SIGVTALRM", SIGVTALRM
);
3958 handle_signal ("SIGPROF", SIGPROF
);
3961 handle_signal ("SIGWINCH", SIGWINCH
);
3964 handle_signal ("SIGINFO", SIGINFO
);
3967 handle_signal ("SIGUSR1", SIGUSR1
);
3970 handle_signal ("SIGUSR2", SIGUSR2
);
3973 error ("Undefined signal name %s", name
);
3976 #undef handle_signal
3978 return make_number (kill (XINT (pid
), XINT (sigcode
)));
3981 DEFUN ("process-send-eof", Fprocess_send_eof
, Sprocess_send_eof
, 0, 1, 0,
3982 "Make PROCESS see end-of-file in its input.\n\
3983 EOF comes after any text already sent to it.\n\
3984 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
3985 nil, indicating the current buffer's process.\n\
3986 If PROCESS is a network connection, or is a process communicating\n\
3987 through a pipe (as opposed to a pty), then you cannot send any more\n\
3988 text to PROCESS after you call this function.")
3990 Lisp_Object process
;
3993 struct coding_system
*coding
;
3995 proc
= get_process (process
);
3996 coding
= proc_encode_coding_system
[XINT (XPROCESS (proc
)->outfd
)];
3998 /* Make sure the process is really alive. */
3999 if (! NILP (XPROCESS (proc
)->raw_status_low
))
4000 update_status (XPROCESS (proc
));
4001 if (! EQ (XPROCESS (proc
)->status
, Qrun
))
4002 error ("Process %s not running", XSTRING (XPROCESS (proc
)->name
)->data
);
4004 if (CODING_REQUIRE_FLUSHING (coding
))
4006 coding
->mode
|= CODING_MODE_LAST_BLOCK
;
4007 send_process (proc
, "", 0, Qnil
);
4011 send_process (proc
, "\032", 1, Qnil
); /* ^z */
4013 if (!NILP (XPROCESS (proc
)->pty_flag
))
4014 send_process (proc
, "\004", 1, Qnil
);
4017 int old_outfd
, new_outfd
;
4019 #ifdef HAVE_SHUTDOWN
4020 /* If this is a network connection, or socketpair is used
4021 for communication with the subprocess, call shutdown to cause EOF.
4022 (In some old system, shutdown to socketpair doesn't work.
4023 Then we just can't win.) */
4024 if (NILP (XPROCESS (proc
)->pid
)
4025 || XINT (XPROCESS (proc
)->outfd
) == XINT (XPROCESS (proc
)->infd
))
4026 shutdown (XINT (XPROCESS (proc
)->outfd
), 1);
4027 /* In case of socketpair, outfd == infd, so don't close it. */
4028 if (XINT (XPROCESS (proc
)->outfd
) != XINT (XPROCESS (proc
)->infd
))
4029 emacs_close (XINT (XPROCESS (proc
)->outfd
));
4030 #else /* not HAVE_SHUTDOWN */
4031 emacs_close (XINT (XPROCESS (proc
)->outfd
));
4032 #endif /* not HAVE_SHUTDOWN */
4033 new_outfd
= emacs_open (NULL_DEVICE
, O_WRONLY
, 0);
4034 old_outfd
= XINT (XPROCESS (proc
)->outfd
);
4036 if (!proc_encode_coding_system
[new_outfd
])
4037 proc_encode_coding_system
[new_outfd
]
4038 = (struct coding_system
*) xmalloc (sizeof (struct coding_system
));
4039 bcopy (proc_encode_coding_system
[old_outfd
],
4040 proc_encode_coding_system
[new_outfd
],
4041 sizeof (struct coding_system
));
4042 bzero (proc_encode_coding_system
[old_outfd
],
4043 sizeof (struct coding_system
));
4045 XSETINT (XPROCESS (proc
)->outfd
, new_outfd
);
4051 /* Kill all processes associated with `buffer'.
4052 If `buffer' is nil, kill all processes */
4055 kill_buffer_processes (buffer
)
4058 Lisp_Object tail
, proc
;
4060 for (tail
= Vprocess_alist
; GC_CONSP (tail
); tail
= XCDR (tail
))
4062 proc
= XCDR (XCAR (tail
));
4063 if (GC_PROCESSP (proc
)
4064 && (NILP (buffer
) || EQ (XPROCESS (proc
)->buffer
, buffer
)))
4066 if (NETCONN_P (proc
))
4067 Fdelete_process (proc
);
4068 else if (XINT (XPROCESS (proc
)->infd
) >= 0)
4069 process_send_signal (proc
, SIGHUP
, Qnil
, 1);
4074 /* On receipt of a signal that a child status has changed,
4075 loop asking about children with changed statuses until
4076 the system says there are no more.
4077 All we do is change the status;
4078 we do not run sentinels or print notifications.
4079 That is saved for the next time keyboard input is done,
4080 in order to avoid timing errors. */
4082 /** WARNING: this can be called during garbage collection.
4083 Therefore, it must not be fooled by the presence of mark bits in
4086 /** USG WARNING: Although it is not obvious from the documentation
4087 in signal(2), on a USG system the SIGCLD handler MUST NOT call
4088 signal() before executing at least one wait(), otherwise the handler
4089 will be called again, resulting in an infinite loop. The relevant
4090 portion of the documentation reads "SIGCLD signals will be queued
4091 and the signal-catching function will be continually reentered until
4092 the queue is empty". Invoking signal() causes the kernel to reexamine
4093 the SIGCLD queue. Fred Fish, UniSoft Systems Inc. */
4096 sigchld_handler (signo
)
4099 int old_errno
= errno
;
4101 register struct Lisp_Process
*p
;
4102 extern EMACS_TIME
*input_available_clear_time
;
4106 sigheld
|= sigbit (SIGCHLD
);
4118 #endif /* no WUNTRACED */
4119 /* Keep trying to get a status until we get a definitive result. */
4123 pid
= wait3 (&w
, WNOHANG
| WUNTRACED
, 0);
4125 while (pid
<= 0 && errno
== EINTR
);
4129 /* A real failure. We have done all our job, so return. */
4131 /* USG systems forget handlers when they are used;
4132 must reestablish each time */
4133 #if defined (USG) && !defined (POSIX_SIGNALS)
4134 signal (signo
, sigchld_handler
); /* WARNING - must come after wait3() */
4137 sigheld
&= ~sigbit (SIGCHLD
);
4145 #endif /* no WNOHANG */
4147 /* Find the process that signaled us, and record its status. */
4150 for (tail
= Vprocess_alist
; CONSP (tail
); tail
= XCDR (tail
))
4152 proc
= XCDR (XCAR (tail
));
4153 p
= XPROCESS (proc
);
4154 if (EQ (p
->childp
, Qt
) && XFASTINT (p
->pid
) == pid
)
4159 /* Look for an asynchronous process whose pid hasn't been filled
4162 for (tail
= Vprocess_alist
; CONSP (tail
); tail
= XCDR (tail
))
4164 proc
= XCDR (XCAR (tail
));
4165 p
= XPROCESS (proc
);
4166 if (INTEGERP (p
->pid
) && XINT (p
->pid
) == -1)
4171 /* Change the status of the process that was found. */
4174 union { int i
; WAITTYPE wt
; } u
;
4175 int clear_desc_flag
= 0;
4177 XSETINT (p
->tick
, ++process_tick
);
4179 XSETINT (p
->raw_status_low
, u
.i
& 0xffff);
4180 XSETINT (p
->raw_status_high
, u
.i
>> 16);
4182 /* If process has terminated, stop waiting for its output. */
4183 if ((WIFSIGNALED (w
) || WIFEXITED (w
))
4184 && XINT (p
->infd
) >= 0)
4185 clear_desc_flag
= 1;
4187 /* We use clear_desc_flag to avoid a compiler bug in Microsoft C. */
4188 if (clear_desc_flag
)
4190 FD_CLR (XINT (p
->infd
), &input_wait_mask
);
4191 FD_CLR (XINT (p
->infd
), &non_keyboard_wait_mask
);
4194 /* Tell wait_reading_process_input that it needs to wake up and
4196 if (input_available_clear_time
)
4197 EMACS_SET_SECS_USECS (*input_available_clear_time
, 0, 0);
4200 /* There was no asynchronous process found for that id. Check
4201 if we have a synchronous process. */
4204 synch_process_alive
= 0;
4206 /* Report the status of the synchronous process. */
4208 synch_process_retcode
= WRETCODE (w
);
4209 else if (WIFSIGNALED (w
))
4211 int code
= WTERMSIG (w
);
4214 synchronize_system_messages_locale ();
4215 signame
= strsignal (code
);
4218 signame
= "unknown";
4220 synch_process_death
= signame
;
4223 /* Tell wait_reading_process_input that it needs to wake up and
4225 if (input_available_clear_time
)
4226 EMACS_SET_SECS_USECS (*input_available_clear_time
, 0, 0);
4229 /* On some systems, we must return right away.
4230 If any more processes want to signal us, we will
4232 Otherwise (on systems that have WNOHANG), loop around
4233 to use up all the processes that have something to tell us. */
4234 #if defined (USG) && ! (defined (HPUX) && defined (WNOHANG)) || defined (WINDOWSNT)
4235 #if defined (USG) && ! defined (POSIX_SIGNALS)
4236 signal (signo
, sigchld_handler
);
4240 #endif /* USG, but not HPUX with WNOHANG */
4246 exec_sentinel_unwind (data
)
4249 XPROCESS (XCAR (data
))->sentinel
= XCDR (data
);
4254 exec_sentinel_error_handler (error
)
4257 cmd_error_internal (error
, "error in process sentinel: ");
4259 update_echo_area ();
4260 Fsleep_for (make_number (2), Qnil
);
4264 exec_sentinel (proc
, reason
)
4265 Lisp_Object proc
, reason
;
4267 Lisp_Object sentinel
, obuffer
, odeactivate
, okeymap
;
4268 register struct Lisp_Process
*p
= XPROCESS (proc
);
4269 int count
= specpdl_ptr
- specpdl
;
4270 int outer_running_asynch_code
= running_asynch_code
;
4271 int waiting
= waiting_for_user_input_p
;
4273 /* No need to gcpro these, because all we do with them later
4274 is test them for EQness, and none of them should be a string. */
4275 odeactivate
= Vdeactivate_mark
;
4276 XSETBUFFER (obuffer
, current_buffer
);
4277 okeymap
= current_buffer
->keymap
;
4279 sentinel
= p
->sentinel
;
4280 if (NILP (sentinel
))
4283 /* Zilch the sentinel while it's running, to avoid recursive invocations;
4284 assure that it gets restored no matter how the sentinel exits. */
4286 record_unwind_protect (exec_sentinel_unwind
, Fcons (proc
, sentinel
));
4287 /* Inhibit quit so that random quits don't screw up a running filter. */
4288 specbind (Qinhibit_quit
, Qt
);
4289 specbind (Qlast_nonmenu_event
, Qt
);
4291 /* In case we get recursively called,
4292 and we already saved the match data nonrecursively,
4293 save the same match data in safely recursive fashion. */
4294 if (outer_running_asynch_code
)
4297 tem
= Fmatch_data (Qnil
, Qnil
);
4298 restore_match_data ();
4299 record_unwind_protect (Fset_match_data
, Fmatch_data (Qnil
, Qnil
));
4300 Fset_match_data (tem
);
4303 /* For speed, if a search happens within this code,
4304 save the match data in a special nonrecursive fashion. */
4305 running_asynch_code
= 1;
4307 internal_condition_case_1 (read_process_output_call
,
4309 Fcons (proc
, Fcons (reason
, Qnil
))),
4310 !NILP (Vdebug_on_error
) ? Qnil
: Qerror
,
4311 exec_sentinel_error_handler
);
4313 /* If we saved the match data nonrecursively, restore it now. */
4314 restore_match_data ();
4315 running_asynch_code
= outer_running_asynch_code
;
4317 Vdeactivate_mark
= odeactivate
;
4319 /* Restore waiting_for_user_input_p as it was
4320 when we were called, in case the filter clobbered it. */
4321 waiting_for_user_input_p
= waiting
;
4324 if (! EQ (Fcurrent_buffer (), obuffer
)
4325 || ! EQ (current_buffer
->keymap
, okeymap
))
4327 /* But do it only if the caller is actually going to read events.
4328 Otherwise there's no need to make him wake up, and it could
4329 cause trouble (for example it would make Fsit_for return). */
4330 if (waiting_for_user_input_p
== -1)
4331 record_asynch_buffer_change ();
4333 unbind_to (count
, Qnil
);
4336 /* Report all recent events of a change in process status
4337 (either run the sentinel or output a message).
4338 This is done while Emacs is waiting for keyboard input. */
4343 register Lisp_Object proc
, buffer
;
4344 Lisp_Object tail
, msg
;
4345 struct gcpro gcpro1
, gcpro2
;
4349 /* We need to gcpro tail; if read_process_output calls a filter
4350 which deletes a process and removes the cons to which tail points
4351 from Vprocess_alist, and then causes a GC, tail is an unprotected
4355 /* Set this now, so that if new processes are created by sentinels
4356 that we run, we get called again to handle their status changes. */
4357 update_tick
= process_tick
;
4359 for (tail
= Vprocess_alist
; !NILP (tail
); tail
= Fcdr (tail
))
4362 register struct Lisp_Process
*p
;
4364 proc
= Fcdr (Fcar (tail
));
4365 p
= XPROCESS (proc
);
4367 if (XINT (p
->tick
) != XINT (p
->update_tick
))
4369 XSETINT (p
->update_tick
, XINT (p
->tick
));
4371 /* If process is still active, read any output that remains. */
4372 while (! EQ (p
->filter
, Qt
)
4373 && XINT (p
->infd
) >= 0
4374 && read_process_output (proc
, XINT (p
->infd
)) > 0);
4378 /* Get the text to use for the message. */
4379 if (!NILP (p
->raw_status_low
))
4381 msg
= status_message (p
->status
);
4383 /* If process is terminated, deactivate it or delete it. */
4385 if (CONSP (p
->status
))
4386 symbol
= XCAR (p
->status
);
4388 if (EQ (symbol
, Qsignal
) || EQ (symbol
, Qexit
)
4389 || EQ (symbol
, Qclosed
))
4391 if (delete_exited_processes
)
4392 remove_process (proc
);
4394 deactivate_process (proc
);
4397 /* The actions above may have further incremented p->tick.
4398 So set p->update_tick again
4399 so that an error in the sentinel will not cause
4400 this code to be run again. */
4401 XSETINT (p
->update_tick
, XINT (p
->tick
));
4402 /* Now output the message suitably. */
4403 if (!NILP (p
->sentinel
))
4404 exec_sentinel (proc
, msg
);
4405 /* Don't bother with a message in the buffer
4406 when a process becomes runnable. */
4407 else if (!EQ (symbol
, Qrun
) && !NILP (buffer
))
4409 Lisp_Object ro
, tem
;
4410 struct buffer
*old
= current_buffer
;
4411 int opoint
, opoint_byte
;
4412 int before
, before_byte
;
4414 ro
= XBUFFER (buffer
)->read_only
;
4416 /* Avoid error if buffer is deleted
4417 (probably that's why the process is dead, too) */
4418 if (NILP (XBUFFER (buffer
)->name
))
4420 Fset_buffer (buffer
);
4423 opoint_byte
= PT_BYTE
;
4424 /* Insert new output into buffer
4425 at the current end-of-output marker,
4426 thus preserving logical ordering of input and output. */
4427 if (XMARKER (p
->mark
)->buffer
)
4428 Fgoto_char (p
->mark
);
4430 SET_PT_BOTH (ZV
, ZV_BYTE
);
4433 before_byte
= PT_BYTE
;
4435 tem
= current_buffer
->read_only
;
4436 current_buffer
->read_only
= Qnil
;
4437 insert_string ("\nProcess ");
4438 Finsert (1, &p
->name
);
4439 insert_string (" ");
4441 current_buffer
->read_only
= tem
;
4442 set_marker_both (p
->mark
, p
->buffer
, PT
, PT_BYTE
);
4444 if (opoint
>= before
)
4445 SET_PT_BOTH (opoint
+ (PT
- before
),
4446 opoint_byte
+ (PT_BYTE
- before_byte
));
4448 SET_PT_BOTH (opoint
, opoint_byte
);
4450 set_buffer_internal (old
);
4455 update_mode_lines
++; /* in case buffers use %s in mode-line-format */
4456 redisplay_preserve_echo_area ();
4462 DEFUN ("set-process-coding-system", Fset_process_coding_system
,
4463 Sset_process_coding_system
, 1, 3, 0,
4464 "Set coding systems of PROCESS to DECODING and ENCODING.\n\
4465 DECODING will be used to decode subprocess output and ENCODING to\n\
4466 encode subprocess input.")
4467 (proc
, decoding
, encoding
)
4468 register Lisp_Object proc
, decoding
, encoding
;
4470 register struct Lisp_Process
*p
;
4472 CHECK_PROCESS (proc
, 0);
4473 p
= XPROCESS (proc
);
4474 if (XINT (p
->infd
) < 0)
4475 error ("Input file descriptor of %s closed", XSTRING (p
->name
)->data
);
4476 if (XINT (p
->outfd
) < 0)
4477 error ("Output file descriptor of %s closed", XSTRING (p
->name
)->data
);
4479 p
->decode_coding_system
= Fcheck_coding_system (decoding
);
4480 p
->encode_coding_system
= Fcheck_coding_system (encoding
);
4481 setup_coding_system (decoding
,
4482 proc_decode_coding_system
[XINT (p
->infd
)]);
4483 setup_coding_system (encoding
,
4484 proc_encode_coding_system
[XINT (p
->outfd
)]);
4489 DEFUN ("process-coding-system",
4490 Fprocess_coding_system
, Sprocess_coding_system
, 1, 1, 0,
4491 "Return a cons of coding systems for decoding and encoding of PROCESS.")
4493 register Lisp_Object proc
;
4495 CHECK_PROCESS (proc
, 0);
4496 return Fcons (XPROCESS (proc
)->decode_coding_system
,
4497 XPROCESS (proc
)->encode_coding_system
);
4500 /* The first time this is called, assume keyboard input comes from DESC
4501 instead of from where we used to expect it.
4502 Subsequent calls mean assume input keyboard can come from DESC
4503 in addition to other places. */
4505 static int add_keyboard_wait_descriptor_called_flag
;
4508 add_keyboard_wait_descriptor (desc
)
4511 if (! add_keyboard_wait_descriptor_called_flag
)
4512 FD_CLR (0, &input_wait_mask
);
4513 add_keyboard_wait_descriptor_called_flag
= 1;
4514 FD_SET (desc
, &input_wait_mask
);
4515 FD_SET (desc
, &non_process_wait_mask
);
4516 if (desc
> max_keyboard_desc
)
4517 max_keyboard_desc
= desc
;
4520 /* From now on, do not expect DESC to give keyboard input. */
4523 delete_keyboard_wait_descriptor (desc
)
4527 int lim
= max_keyboard_desc
;
4529 FD_CLR (desc
, &input_wait_mask
);
4530 FD_CLR (desc
, &non_process_wait_mask
);
4532 if (desc
== max_keyboard_desc
)
4533 for (fd
= 0; fd
< lim
; fd
++)
4534 if (FD_ISSET (fd
, &input_wait_mask
)
4535 && !FD_ISSET (fd
, &non_keyboard_wait_mask
))
4536 max_keyboard_desc
= fd
;
4539 /* Return nonzero if *MASK has a bit set
4540 that corresponds to one of the keyboard input descriptors. */
4543 keyboard_bit_set (mask
)
4548 for (fd
= 0; fd
<= max_keyboard_desc
; fd
++)
4549 if (FD_ISSET (fd
, mask
) && FD_ISSET (fd
, &input_wait_mask
)
4550 && !FD_ISSET (fd
, &non_keyboard_wait_mask
))
4563 if (! noninteractive
|| initialized
)
4565 signal (SIGCHLD
, sigchld_handler
);
4568 FD_ZERO (&input_wait_mask
);
4569 FD_ZERO (&non_keyboard_wait_mask
);
4570 FD_ZERO (&non_process_wait_mask
);
4571 max_process_desc
= 0;
4573 FD_SET (0, &input_wait_mask
);
4575 Vprocess_alist
= Qnil
;
4576 for (i
= 0; i
< MAXDESC
; i
++)
4578 chan_process
[i
] = Qnil
;
4579 proc_buffered_char
[i
] = -1;
4581 bzero (proc_decode_coding_system
, sizeof proc_decode_coding_system
);
4582 bzero (proc_encode_coding_system
, sizeof proc_encode_coding_system
);
4584 Vdefault_process_coding_system
4585 = (NILP (buffer_defaults
.enable_multibyte_characters
)
4586 ? Fcons (Qraw_text
, Qnil
)
4587 : Fcons (Qemacs_mule
, Qnil
));
4593 Qprocessp
= intern ("processp");
4594 staticpro (&Qprocessp
);
4595 Qrun
= intern ("run");
4597 Qstop
= intern ("stop");
4599 Qsignal
= intern ("signal");
4600 staticpro (&Qsignal
);
4602 /* Qexit is already staticpro'd by syms_of_eval; don't staticpro it
4605 Qexit = intern ("exit");
4606 staticpro (&Qexit); */
4608 Qopen
= intern ("open");
4610 Qclosed
= intern ("closed");
4611 staticpro (&Qclosed
);
4613 Qlast_nonmenu_event
= intern ("last-nonmenu-event");
4614 staticpro (&Qlast_nonmenu_event
);
4616 staticpro (&Vprocess_alist
);
4618 DEFVAR_BOOL ("delete-exited-processes", &delete_exited_processes
,
4619 "*Non-nil means delete processes immediately when they exit.\n\
4620 nil means don't delete them until `list-processes' is run.");
4622 delete_exited_processes
= 1;
4624 DEFVAR_LISP ("process-connection-type", &Vprocess_connection_type
,
4625 "Control type of device used to communicate with subprocesses.\n\
4626 Values are nil to use a pipe, or t or `pty' to use a pty.\n\
4627 The value has no effect if the system has no ptys or if all ptys are busy:\n\
4628 then a pipe is used in any case.\n\
4629 The value takes effect when `start-process' is called.");
4630 Vprocess_connection_type
= Qt
;
4632 defsubr (&Sprocessp
);
4633 defsubr (&Sget_process
);
4634 defsubr (&Sget_buffer_process
);
4635 defsubr (&Sdelete_process
);
4636 defsubr (&Sprocess_status
);
4637 defsubr (&Sprocess_exit_status
);
4638 defsubr (&Sprocess_id
);
4639 defsubr (&Sprocess_name
);
4640 defsubr (&Sprocess_tty_name
);
4641 defsubr (&Sprocess_command
);
4642 defsubr (&Sset_process_buffer
);
4643 defsubr (&Sprocess_buffer
);
4644 defsubr (&Sprocess_mark
);
4645 defsubr (&Sset_process_filter
);
4646 defsubr (&Sprocess_filter
);
4647 defsubr (&Sset_process_sentinel
);
4648 defsubr (&Sprocess_sentinel
);
4649 defsubr (&Sset_process_window_size
);
4650 defsubr (&Sset_process_inherit_coding_system_flag
);
4651 defsubr (&Sprocess_inherit_coding_system_flag
);
4652 defsubr (&Sprocess_kill_without_query
);
4653 defsubr (&Sprocess_contact
);
4654 defsubr (&Slist_processes
);
4655 defsubr (&Sprocess_list
);
4656 defsubr (&Sstart_process
);
4658 defsubr (&Sopen_network_stream
);
4659 #endif /* HAVE_SOCKETS */
4660 defsubr (&Saccept_process_output
);
4661 defsubr (&Sprocess_send_region
);
4662 defsubr (&Sprocess_send_string
);
4663 defsubr (&Sinterrupt_process
);
4664 defsubr (&Skill_process
);
4665 defsubr (&Squit_process
);
4666 defsubr (&Sstop_process
);
4667 defsubr (&Scontinue_process
);
4668 defsubr (&Sprocess_running_child_p
);
4669 defsubr (&Sprocess_send_eof
);
4670 defsubr (&Ssignal_process
);
4671 defsubr (&Swaiting_for_user_input_p
);
4672 /* defsubr (&Sprocess_connection); */
4673 defsubr (&Sset_process_coding_system
);
4674 defsubr (&Sprocess_coding_system
);
4678 #else /* not subprocesses */
4680 #include <sys/types.h>
4684 #include "systime.h"
4685 #include "charset.h"
4687 #include "termopts.h"
4688 #include "sysselect.h"
4690 extern int frame_garbaged
;
4692 extern EMACS_TIME
timer_check ();
4693 extern int timers_run
;
4695 /* As described above, except assuming that there are no subprocesses:
4697 Wait for timeout to elapse and/or keyboard input to be available.
4700 timeout in seconds, or
4701 zero for no limit, or
4702 -1 means gobble data immediately available but don't wait for any.
4704 read_kbd is a Lisp_Object:
4705 0 to ignore keyboard input, or
4706 1 to return when input is available, or
4707 -1 means caller will actually read the input, so don't throw to
4709 a cons cell, meaning wait until its car is non-nil
4710 (and gobble terminal input into the buffer if any arrives), or
4711 We know that read_kbd will never be a Lisp_Process, since
4712 `subprocesses' isn't defined.
4714 do_display != 0 means redisplay should be done to show subprocess
4715 output that arrives.
4717 Return true iff we received input from any process. */
4720 wait_reading_process_input (time_limit
, microsecs
, read_kbd
, do_display
)
4721 int time_limit
, microsecs
;
4722 Lisp_Object read_kbd
;
4726 EMACS_TIME end_time
, timeout
;
4727 SELECT_TYPE waitchannels
;
4729 Lisp_Object
*wait_for_cell
= 0;
4731 /* If waiting for non-nil in a cell, record where. */
4732 if (CONSP (read_kbd
))
4734 wait_for_cell
= &XCAR (read_kbd
);
4735 XSETFASTINT (read_kbd
, 0);
4738 /* What does time_limit really mean? */
4739 if (time_limit
|| microsecs
)
4741 EMACS_GET_TIME (end_time
);
4742 EMACS_SET_SECS_USECS (timeout
, time_limit
, microsecs
);
4743 EMACS_ADD_TIME (end_time
, end_time
, timeout
);
4746 /* Turn off periodic alarms (in case they are in use)
4747 because the select emulator uses alarms. */
4752 int timeout_reduced_for_timers
= 0;
4754 /* If calling from keyboard input, do not quit
4755 since we want to return C-g as an input character.
4756 Otherwise, do pending quit if requested. */
4757 if (XINT (read_kbd
) >= 0)
4760 /* Exit now if the cell we're waiting for became non-nil. */
4761 if (wait_for_cell
&& ! NILP (*wait_for_cell
))
4764 /* Compute time from now till when time limit is up */
4765 /* Exit if already run out */
4766 if (time_limit
== -1)
4768 /* -1 specified for timeout means
4769 gobble output available now
4770 but don't wait at all. */
4772 EMACS_SET_SECS_USECS (timeout
, 0, 0);
4774 else if (time_limit
|| microsecs
)
4776 EMACS_GET_TIME (timeout
);
4777 EMACS_SUB_TIME (timeout
, end_time
, timeout
);
4778 if (EMACS_TIME_NEG_P (timeout
))
4783 EMACS_SET_SECS_USECS (timeout
, 100000, 0);
4786 /* If our caller will not immediately handle keyboard events,
4787 run timer events directly.
4788 (Callers that will immediately read keyboard events
4789 call timer_delay on their own.) */
4790 if (! wait_for_cell
)
4792 EMACS_TIME timer_delay
;
4796 old_timers_run
= timers_run
;
4797 timer_delay
= timer_check (1);
4798 if (timers_run
!= old_timers_run
&& do_display
)
4800 redisplay_preserve_echo_area ();
4801 /* We must retry, since a timer may have requeued itself
4802 and that could alter the time delay. */
4806 /* If there is unread keyboard input, also return. */
4807 if (XINT (read_kbd
) != 0
4808 && requeued_events_pending_p ())
4811 if (! EMACS_TIME_NEG_P (timer_delay
) && time_limit
!= -1)
4813 EMACS_TIME difference
;
4814 EMACS_SUB_TIME (difference
, timer_delay
, timeout
);
4815 if (EMACS_TIME_NEG_P (difference
))
4817 timeout
= timer_delay
;
4818 timeout_reduced_for_timers
= 1;
4823 /* Cause C-g and alarm signals to take immediate action,
4824 and cause input available signals to zero out timeout. */
4825 if (XINT (read_kbd
) < 0)
4826 set_waiting_for_input (&timeout
);
4828 /* Wait till there is something to do. */
4830 if (! XINT (read_kbd
) && wait_for_cell
== 0)
4831 FD_ZERO (&waitchannels
);
4833 FD_SET (0, &waitchannels
);
4835 /* If a frame has been newly mapped and needs updating,
4836 reprocess its display stuff. */
4837 if (frame_garbaged
&& do_display
)
4839 clear_waiting_for_input ();
4840 redisplay_preserve_echo_area ();
4841 if (XINT (read_kbd
) < 0)
4842 set_waiting_for_input (&timeout
);
4845 if (XINT (read_kbd
) && detect_input_pending ())
4848 FD_ZERO (&waitchannels
);
4851 nfds
= select (1, &waitchannels
, (SELECT_TYPE
*)0, (SELECT_TYPE
*)0,
4856 /* Make C-g and alarm signals set flags again */
4857 clear_waiting_for_input ();
4859 /* If we woke up due to SIGWINCH, actually change size now. */
4860 do_pending_window_change (0);
4862 if (time_limit
&& nfds
== 0 && ! timeout_reduced_for_timers
)
4863 /* We waited the full specified time, so return now. */
4868 /* If the system call was interrupted, then go around the
4870 if (xerrno
== EINTR
)
4871 FD_ZERO (&waitchannels
);
4873 error ("select error: %s", emacs_strerror (xerrno
));
4876 else if (nfds
> 0 && (waitchannels
& 1) && interrupt_input
)
4877 /* System sometimes fails to deliver SIGIO. */
4878 kill (getpid (), SIGIO
);
4881 if (XINT (read_kbd
) && interrupt_input
&& (waitchannels
& 1))
4882 kill (getpid (), SIGIO
);
4885 /* Check for keyboard input */
4887 if ((XINT (read_kbd
) != 0)
4888 && detect_input_pending_run_timers (do_display
))
4890 swallow_events (do_display
);
4891 if (detect_input_pending_run_timers (do_display
))
4895 /* If there is unread keyboard input, also return. */
4896 if (XINT (read_kbd
) != 0
4897 && requeued_events_pending_p ())
4900 /* If wait_for_cell. check for keyboard input
4901 but don't run any timers.
4902 ??? (It seems wrong to me to check for keyboard
4903 input at all when wait_for_cell, but the code
4904 has been this way since July 1994.
4905 Try changing this after version 19.31.) */
4907 && detect_input_pending ())
4909 swallow_events (do_display
);
4910 if (detect_input_pending ())
4914 /* Exit now if the cell we're waiting for became non-nil. */
4915 if (wait_for_cell
&& ! NILP (*wait_for_cell
))
4925 DEFUN ("get-buffer-process", Fget_buffer_process
, Sget_buffer_process
, 1, 1, 0,
4926 /* Don't confuse make-docfile by having two doc strings for this function.
4927 make-docfile does not pay attention to #if, for good reason! */
4930 register Lisp_Object name
;
4935 DEFUN ("process-inherit-coding-system-flag",
4936 Fprocess_inherit_coding_system_flag
, Sprocess_inherit_coding_system_flag
,
4938 /* Don't confuse make-docfile by having two doc strings for this function.
4939 make-docfile does not pay attention to #if, for good reason! */
4942 register Lisp_Object process
;
4944 /* Ignore the argument and return the value of
4945 inherit-process-coding-system. */
4946 return inherit_process_coding_system
? Qt
: Qnil
;
4949 /* Kill all processes associated with `buffer'.
4950 If `buffer' is nil, kill all processes.
4951 Since we have no subprocesses, this does nothing. */
4954 kill_buffer_processes (buffer
)
4967 defsubr (&Sget_buffer_process
);
4968 defsubr (&Sprocess_inherit_coding_system_flag
);
4972 #endif /* not subprocesses */