1 /* Asynchronous subprocess control for GNU Emacs.
2 Copyright (C) 1985, 1986, 1987, 1988, 1992, 1993 Free Software Foundation, Inc.
4 This file is part of GNU Emacs.
6 GNU Emacs is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU Emacs is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU Emacs; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
25 /* This file is split into two parts by the following preprocessor
26 conditional. The 'then' clause contains all of the support for
27 asynchronous subprocesses. The 'else' clause contains stub
28 versions of some of the asynchronous subprocess routines that are
29 often called elsewhere in Emacs, so we don't have to #ifdef the
30 sections that call them. */
38 #include <sys/types.h> /* some typedefs are used in sys/file.h */
42 #ifdef HAVE_SOCKETS /* TCP connection support, if kernel can do it */
43 #include <sys/socket.h>
45 #include <netinet/in.h>
46 #include <arpa/inet.h>
47 #endif /* HAVE_SOCKETS */
49 #if defined(BSD) || defined(STRIDE)
50 #include <sys/ioctl.h>
51 #if !defined (O_NDELAY) && defined (HAVE_PTYS) && !defined(USG5)
53 #endif /* HAVE_PTYS and no O_NDELAY */
54 #endif /* BSD or STRIDE */
61 #include <sys/sysmacros.h> /* for "minor" */
71 #include "termhooks.h"
76 Lisp_Object Qrun
, Qstop
, Qsignal
, Qopen
, Qclosed
;
77 /* Qexit is declared and initialized in eval.c. */
79 /* a process object is a network connection when its childp field is neither
80 Qt nor Qnil but is instead a string (name of foreign host we
81 are connected to + name of port we are connected to) */
84 static Lisp_Object stream_process
;
86 #define NETCONN_P(p) (XGCTYPE (XPROCESS (p)->childp) == Lisp_String)
88 #define NETCONN_P(p) 0
89 #endif /* HAVE_SOCKETS */
91 /* Define first descriptor number available for subprocesses. */
93 #define FIRST_PROC_DESC 1
95 #define FIRST_PROC_DESC 3
98 /* Define SIGCHLD as an alias for SIGCLD. There are many conditionals
101 #if !defined (SIGCHLD) && defined (SIGCLD)
102 #define SIGCHLD SIGCLD
105 #include "syssignal.h"
107 /* Define the structure that the wait system call stores.
108 On many systems, there is a structure defined for this.
109 But on vanilla-ish USG systems there is not. */
113 #if !defined (BSD) && !defined (UNIPLUS) && !defined (STRIDE) && !(defined (HPUX) && !defined (NOMULTIPLEJOBS)) && !defined (HAVE_WAIT_HEADER)
115 #define WIFSTOPPED(w) ((w&0377) == 0177)
116 #define WIFSIGNALED(w) ((w&0377) != 0177 && (w&~0377) == 0)
117 #define WIFEXITED(w) ((w&0377) == 0)
118 #define WRETCODE(w) (w >> 8)
119 #define WSTOPSIG(w) (w >> 8)
120 #define WTERMSIG(w) (w & 0377)
122 #define WCOREDUMP(w) ((w&0200) != 0)
128 #include <sys/wait.h>
129 #endif /* not BSD 4.1 */
131 #define WAITTYPE union wait
132 #define WRETCODE(w) w.w_retcode
133 #define WCOREDUMP(w) w.w_coredump
136 /* HPUX version 7 has broken definitions of these. */
145 #define WTERMSIG(w) w.w_termsig
148 #define WSTOPSIG(w) w.w_stopsig
151 #define WIFSTOPPED(w) (WTERMSIG (w) == 0177)
154 #define WIFSIGNALED(w) (WTERMSIG (w) != 0177 && (WSTOPSIG (w)) == 0)
157 #define WIFEXITED(w) (WTERMSIG (w) == 0)
159 #endif /* BSD or UNIPLUS or STRIDE */
160 #endif /* no WAITTYPE */
163 /* For the CMU PTY driver + */
164 #define DCL_PROMPT "$ "
165 /* This is a hack. I have no idea what needs to go here, but this */
166 /* will get it to compile. We can fix it later. rbr */
176 extern char *sys_errlist
[];
180 extern char *sys_siglist
[];
182 char *sys_siglist
[] =
188 "illegal instruction",
192 "floating point exception",
195 "segmentation violation",
196 "bad argument to system call",
197 "write on a pipe with no one to read it",
199 "software termination signal from kill",
201 "sendable stop signal not from tty",
202 "stop signal from tty",
203 "continue a stopped process",
204 "child status has changed",
205 "background read attempted from control tty",
206 "background write attempted from control tty",
207 "input record available at control tty",
208 "exceeded CPU time limit",
209 "exceeded file size limit"
217 extern int comm_server
;
218 extern int net_listen_address
;
221 /* t means use pty, nil means use a pipe,
222 maybe other values to come. */
223 Lisp_Object Vprocess_connection_type
;
227 #include <sys/socket.h>
231 /* Number of events of change of status of a process. */
234 /* Number of events for which the user or sentinel has been notified. */
238 /* We could get this from param.h, but better not to depend on finding that.
239 And better not to risk that it might define other symbols used in this
242 #define SELECT_TYPE fd_set
243 #else /* no FD_SET */
245 #define SELECT_TYPE int
247 /* Define the macros to access a single-int bitmap of descriptors. */
248 #define FD_SET(n, p) (*(p) |= (1 << (n)))
249 #define FD_CLR(n, p) (*(p) &= ~(1 << (n)))
250 #define FD_ISSET(n, p) (*(p) & (1 << (n)))
251 #define FD_ZERO(p) (*(p) = 0)
252 #endif /* no FD_SET */
254 /* Mask of bits indicating the descriptors that we wait for input on */
256 SELECT_TYPE input_wait_mask
;
258 int delete_exited_processes
;
260 /* Indexed by descriptor, gives the process (if any) for that descriptor */
261 Lisp_Object chan_process
[MAXDESC
];
263 /* Alist of elements (NAME . PROCESS) */
264 Lisp_Object Vprocess_alist
;
266 Lisp_Object Qprocessp
;
268 Lisp_Object
get_process ();
270 /* Buffered-ahead input char from process, indexed by channel.
271 -1 means empty (no char is buffered).
272 Used on sys V where the only way to tell if there is any
273 output from the process is to read at least one char.
274 Always -1 on systems that support FIONREAD. */
276 int proc_buffered_char
[MAXDESC
];
278 /* Compute the Lisp form of the process status, p->status, from
279 the numeric status that was returned by `wait'. */
281 Lisp_Object
status_convert ();
284 struct Lisp_Process
*p
;
286 union { int i
; WAITTYPE wt
; } u
;
287 u
.i
= XFASTINT (p
->raw_status_low
) + (XFASTINT (p
->raw_status_high
) << 16);
288 p
->status
= status_convert (u
.wt
);
289 p
->raw_status_low
= Qnil
;
290 p
->raw_status_high
= Qnil
;
293 /* Convert a process status work in Unix format to
294 the list that we use internally. */
301 return Fcons (Qstop
, Fcons (make_number (WSTOPSIG (w
)), Qnil
));
302 else if (WIFEXITED (w
))
303 return Fcons (Qexit
, Fcons (make_number (WRETCODE (w
)),
304 WCOREDUMP (w
) ? Qt
: Qnil
));
305 else if (WIFSIGNALED (w
))
306 return Fcons (Qsignal
, Fcons (make_number (WTERMSIG (w
)),
307 WCOREDUMP (w
) ? Qt
: Qnil
));
312 /* Given a status-list, extract the three pieces of information
313 and store them individually through the three pointers. */
316 decode_status (l
, symbol
, code
, coredump
)
324 if (XTYPE (l
) == Lisp_Symbol
)
332 *symbol
= XCONS (l
)->car
;
333 tem
= XCONS (l
)->cdr
;
334 *code
= XFASTINT (XCONS (tem
)->car
);
335 tem
= XCONS (tem
)->cdr
;
336 *coredump
= !NILP (tem
);
340 /* Return a string describing a process status list. */
343 status_message (status
)
348 Lisp_Object string
, string2
;
350 decode_status (status
, &symbol
, &code
, &coredump
);
352 if (EQ (symbol
, Qsignal
) || EQ (symbol
, Qstop
))
355 string
= build_string (code
< NSIG
? sys_siglist
[code
] : "unknown");
357 string
= build_string (code
< NSIG
? sys_errlist
[code
] : "unknown");
359 string2
= build_string (coredump
? " (core dumped)\n" : "\n");
360 XSTRING (string
)->data
[0] = DOWNCASE (XSTRING (string
)->data
[0]);
361 return concat2 (string
, string2
);
363 else if (EQ (symbol
, Qexit
))
366 return build_string ("finished\n");
367 string
= Fint_to_string (make_number (code
));
368 string2
= build_string (coredump
? " (core dumped)\n" : "\n");
369 return concat2 (build_string ("exited abnormally with code "),
370 concat2 (string
, string2
));
373 return Fcopy_sequence (Fsymbol_name (symbol
));
378 /* Open an available pty, returning a file descriptor.
379 Return -1 on failure.
380 The file name of the terminal corresponding to the pty
381 is left in the variable pty_name. */
392 /* Some systems name their pseudoterminals so that there are gaps in
393 the usual sequence - for example, on HP9000/S700 systems, there
394 are no pseudoterminals with names ending in 'f'. So we wait for
395 three failures in a row before deciding that we've reached the
397 int failed_count
= 0;
402 for (c
= FIRST_PTY_LETTER
; c
<= 'z'; c
++)
403 for (i
= 0; i
< 16; i
++)
406 #ifdef PTY_NAME_SPRINTF
409 sprintf (pty_name
, "/dev/pty%c%x", c
, i
);
410 #endif /* no PTY_NAME_SPRINTF */
414 #else /* no PTY_OPEN */
416 /* Unusual IRIS code */
417 *ptyv
= open ("/dev/ptc", O_RDWR
| O_NDELAY
, 0);
420 if (fstat (fd
, &stb
) < 0)
423 if (stat (pty_name
, &stb
) < 0)
426 if (failed_count
>= 3)
432 fd
= open (pty_name
, O_RDWR
| O_NONBLOCK
, 0);
434 fd
= open (pty_name
, O_RDWR
| O_NDELAY
, 0);
436 #endif /* not IRIS */
437 #endif /* no PTY_OPEN */
441 /* check to make certain that both sides are available
442 this avoids a nasty yet stupid bug in rlogins */
443 #ifdef PTY_TTY_NAME_SPRINTF
446 sprintf (pty_name
, "/dev/tty%c%x", c
, i
);
447 #endif /* no PTY_TTY_NAME_SPRINTF */
449 if (access (pty_name
, 6) != 0)
458 #endif /* not UNIPLUS */
465 #endif /* HAVE_PTYS */
471 register Lisp_Object val
, tem
, name1
;
472 register struct Lisp_Process
*p
;
476 /* size of process structure includes the vector header,
477 so deduct for that. But struct Lisp_Vector includes the first
478 element, thus deducts too much, so add it back. */
479 val
= Fmake_vector (make_number ((sizeof (struct Lisp_Process
)
480 - sizeof (struct Lisp_Vector
)
481 + sizeof (Lisp_Object
))
482 / sizeof (Lisp_Object
)),
484 XSETTYPE (val
, Lisp_Process
);
487 XFASTINT (p
->infd
) = 0;
488 XFASTINT (p
->outfd
) = 0;
489 XFASTINT (p
->pid
) = 0;
490 XFASTINT (p
->tick
) = 0;
491 XFASTINT (p
->update_tick
) = 0;
492 p
->raw_status_low
= Qnil
;
493 p
->raw_status_high
= Qnil
;
495 p
->mark
= Fmake_marker ();
497 /* If name is already in use, modify it until it is unused. */
502 tem
= Fget_process (name1
);
503 if (NILP (tem
)) break;
504 sprintf (suffix
, "<%d>", i
);
505 name1
= concat2 (name
, build_string (suffix
));
509 Vprocess_alist
= Fcons (Fcons (name
, val
), Vprocess_alist
);
513 remove_process (proc
)
514 register Lisp_Object proc
;
516 register Lisp_Object pair
;
518 pair
= Frassq (proc
, Vprocess_alist
);
519 Vprocess_alist
= Fdelq (pair
, Vprocess_alist
);
520 Fset_marker (XPROCESS (proc
)->mark
, Qnil
, Qnil
);
522 deactivate_process (proc
);
525 DEFUN ("processp", Fprocessp
, Sprocessp
, 1, 1, 0,
526 "Return t if OBJECT is a process.")
530 return XTYPE (obj
) == Lisp_Process
? Qt
: Qnil
;
533 DEFUN ("get-process", Fget_process
, Sget_process
, 1, 1, 0,
534 "Return the process named NAME, or nil if there is none.")
536 register Lisp_Object name
;
538 if (XTYPE (name
) == Lisp_Process
)
540 CHECK_STRING (name
, 0);
541 return Fcdr (Fassoc (name
, Vprocess_alist
));
544 DEFUN ("get-buffer-process", Fget_buffer_process
, Sget_buffer_process
, 1, 1, 0,
545 "Return the (or, a) process associated with BUFFER.\n\
546 BUFFER may be a buffer or the name of one.")
548 register Lisp_Object name
;
550 register Lisp_Object buf
, tail
, proc
;
552 if (NILP (name
)) return Qnil
;
553 buf
= Fget_buffer (name
);
554 if (NILP (buf
)) return Qnil
;
556 for (tail
= Vprocess_alist
; !NILP (tail
); tail
= Fcdr (tail
))
558 proc
= Fcdr (Fcar (tail
));
559 if (XTYPE (proc
) == Lisp_Process
&& EQ (XPROCESS (proc
)->buffer
, buf
))
565 /* This is how commands for the user decode process arguments. It
566 accepts a process, a process name, a buffer, a buffer name, or nil.
567 Buffers denote the first process in the buffer, and nil denotes the
572 register Lisp_Object name
;
574 register Lisp_Object proc
;
576 proc
= Fget_buffer_process (Fcurrent_buffer ());
579 proc
= Fget_process (name
);
581 proc
= Fget_buffer_process (Fget_buffer (name
));
588 error ("Current buffer has no process");
590 error ("Process %s does not exist", XSTRING (name
)->data
);
594 DEFUN ("delete-process", Fdelete_process
, Sdelete_process
, 1, 1, 0,
595 "Delete PROCESS: kill it and forget about it immediately.\n\
596 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
597 nil, indicating the current buffer's process.")
599 register Lisp_Object proc
;
601 proc
= get_process (proc
);
602 XPROCESS (proc
)->raw_status_low
= Qnil
;
603 XPROCESS (proc
)->raw_status_high
= Qnil
;
604 if (NETCONN_P (proc
))
606 XPROCESS (proc
)->status
= Fcons (Qexit
, Fcons (make_number (0), Qnil
));
607 XSETINT (XPROCESS (proc
)->tick
, ++process_tick
);
609 else if (XFASTINT (XPROCESS (proc
)->infd
))
611 Fkill_process (proc
, Qnil
);
612 /* Do this now, since remove_process will make sigchld_handler do nothing. */
613 XPROCESS (proc
)->status
614 = Fcons (Qsignal
, Fcons (make_number (SIGKILL
), Qnil
));
615 XSETINT (XPROCESS (proc
)->tick
, ++process_tick
);
618 remove_process (proc
);
622 DEFUN ("process-status", Fprocess_status
, Sprocess_status
, 1, 1, 0,
623 "Return the status of PROCESS: a symbol, one of these:\n\
624 run -- for a process that is running.\n\
625 stop -- for a process stopped but continuable.\n\
626 exit -- for a process that has exited.\n\
627 signal -- for a process that has got a fatal signal.\n\
628 open -- for a network stream connection that is open.\n\
629 closed -- for a network stream connection that is closed.\n\
630 nil -- if arg is a process name and no such process exists.\n\
631 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
632 nil, indicating the current buffer's process.")
633 /* command -- for a command channel opened to Emacs by another process.\n\
634 external -- for an i/o channel opened to Emacs by another process.\n\ */
636 register Lisp_Object proc
;
638 register struct Lisp_Process
*p
;
639 register Lisp_Object status
;
640 proc
= get_process (proc
);
644 if (!NILP (p
->raw_status_low
))
647 if (XTYPE (status
) == Lisp_Cons
)
648 status
= XCONS (status
)->car
;
649 if (NETCONN_P (proc
))
651 if (EQ (status
, Qrun
))
653 else if (EQ (status
, Qexit
))
659 DEFUN ("process-exit-status", Fprocess_exit_status
, Sprocess_exit_status
,
661 "Return the exit status of PROCESS or the signal number that killed it.\n\
662 If PROCESS has not yet exited or died, return 0.")
664 register Lisp_Object proc
;
666 CHECK_PROCESS (proc
, 0);
667 if (!NILP (XPROCESS (proc
)->raw_status_low
))
668 update_status (XPROCESS (proc
));
669 if (XTYPE (XPROCESS (proc
)->status
) == Lisp_Cons
)
670 return XCONS (XCONS (XPROCESS (proc
)->status
)->cdr
)->car
;
671 return make_number (0);
674 DEFUN ("process-id", Fprocess_id
, Sprocess_id
, 1, 1, 0,
675 "Return the process id of PROCESS.\n\
676 This is the pid of the Unix process which PROCESS uses or talks to.\n\
677 For a network connection, this value is nil.")
679 register Lisp_Object proc
;
681 CHECK_PROCESS (proc
, 0);
682 return XPROCESS (proc
)->pid
;
685 DEFUN ("process-name", Fprocess_name
, Sprocess_name
, 1, 1, 0,
686 "Return the name of PROCESS, as a string.\n\
687 This is the name of the program invoked in PROCESS,\n\
688 possibly modified to make it unique among process names.")
690 register Lisp_Object proc
;
692 CHECK_PROCESS (proc
, 0);
693 return XPROCESS (proc
)->name
;
696 DEFUN ("process-command", Fprocess_command
, Sprocess_command
, 1, 1, 0,
697 "Return the command that was executed to start PROCESS.\n\
698 This is a list of strings, the first string being the program executed\n\
699 and the rest of the strings being the arguments given to it.\n\
700 For a non-child channel, this is nil.")
702 register Lisp_Object proc
;
704 CHECK_PROCESS (proc
, 0);
705 return XPROCESS (proc
)->command
;
708 DEFUN ("set-process-buffer", Fset_process_buffer
, Sset_process_buffer
,
710 "Set buffer associated with PROCESS to BUFFER (a buffer, or nil).")
712 register Lisp_Object proc
, buffer
;
714 CHECK_PROCESS (proc
, 0);
716 CHECK_BUFFER (buffer
, 1);
717 XPROCESS (proc
)->buffer
= buffer
;
721 DEFUN ("process-buffer", Fprocess_buffer
, Sprocess_buffer
,
723 "Return the buffer PROCESS is associated with.\n\
724 Output from PROCESS is inserted in this buffer\n\
725 unless PROCESS has a filter.")
727 register Lisp_Object proc
;
729 CHECK_PROCESS (proc
, 0);
730 return XPROCESS (proc
)->buffer
;
733 DEFUN ("process-mark", Fprocess_mark
, Sprocess_mark
,
735 "Return the marker for the end of the last output from PROCESS.")
737 register Lisp_Object proc
;
739 CHECK_PROCESS (proc
, 0);
740 return XPROCESS (proc
)->mark
;
743 DEFUN ("set-process-filter", Fset_process_filter
, Sset_process_filter
,
745 "Give PROCESS the filter function FILTER; nil means no filter.\n\
746 When a process has a filter, each time it does output\n\
747 the entire string of output is passed to the filter.\n\
748 The filter gets two arguments: the process and the string of output.\n\
749 If the process has a filter, its buffer is not used for output.")
751 register Lisp_Object proc
, filter
;
753 CHECK_PROCESS (proc
, 0);
754 XPROCESS (proc
)->filter
= filter
;
758 DEFUN ("process-filter", Fprocess_filter
, Sprocess_filter
,
760 "Returns the filter function of PROCESS; nil if none.\n\
761 See `set-process-filter' for more info on filter functions.")
763 register Lisp_Object proc
;
765 CHECK_PROCESS (proc
, 0);
766 return XPROCESS (proc
)->filter
;
769 DEFUN ("set-process-sentinel", Fset_process_sentinel
, Sset_process_sentinel
,
771 "Give PROCESS the sentinel SENTINEL; nil for none.\n\
772 The sentinel is called as a function when the process changes state.\n\
773 It gets two arguments: the process, and a string describing the change.")
775 register Lisp_Object proc
, sentinel
;
777 CHECK_PROCESS (proc
, 0);
778 XPROCESS (proc
)->sentinel
= sentinel
;
782 DEFUN ("process-sentinel", Fprocess_sentinel
, Sprocess_sentinel
,
784 "Return the sentinel of PROCESS; nil if none.\n\
785 See `set-process-sentinel' for more info on sentinels.")
787 register Lisp_Object proc
;
789 CHECK_PROCESS (proc
, 0);
790 return XPROCESS (proc
)->sentinel
;
793 DEFUN ("process-kill-without-query", Fprocess_kill_without_query
,
794 Sprocess_kill_without_query
, 1, 2, 0,
795 "Say no query needed if PROCESS is running when Emacs is exited.\n\
796 Optional second argument if non-nill says to require a query.\n\
797 Value is t if a query was formerly required.")
799 register Lisp_Object proc
, value
;
803 CHECK_PROCESS (proc
, 0);
804 tem
= XPROCESS (proc
)->kill_without_query
;
805 XPROCESS (proc
)->kill_without_query
= Fnull (value
);
813 register Lisp_Object tail
, tem
;
814 Lisp_Object proc
, minspace
, tem1
;
815 register struct buffer
*old
= current_buffer
;
816 register struct Lisp_Process
*p
;
820 XFASTINT (minspace
) = 1;
822 set_buffer_internal (XBUFFER (Vstandard_output
));
823 Fbuffer_disable_undo (Vstandard_output
);
825 current_buffer
->truncate_lines
= Qt
;
828 Proc Status Buffer Command\n\
829 ---- ------ ------ -------\n", -1);
831 for (tail
= Vprocess_alist
; !NILP (tail
); tail
= Fcdr (tail
))
835 proc
= Fcdr (Fcar (tail
));
837 if (NILP (p
->childp
))
840 Finsert (1, &p
->name
);
841 Findent_to (make_number (13), minspace
);
843 if (!NILP (p
->raw_status_low
))
846 if (XTYPE (p
->status
) == Lisp_Cons
)
847 symbol
= XCONS (p
->status
)->car
;
850 if (EQ (symbol
, Qsignal
))
853 tem
= Fcar (Fcdr (p
->status
));
855 if (XINT (tem
) < NSIG
)
856 write_string (sys_errlist
[XINT (tem
)], -1);
859 Fprinc (symbol
, Qnil
);
861 else if (NETCONN_P (proc
))
863 if (EQ (symbol
, Qrun
))
864 write_string ("open", -1);
865 else if (EQ (symbol
, Qexit
))
866 write_string ("closed", -1);
868 Fprinc (symbol
, Qnil
);
871 Fprinc (symbol
, Qnil
);
873 if (EQ (symbol
, Qexit
))
876 tem
= Fcar (Fcdr (p
->status
));
879 sprintf (tembuf
, " %d", XFASTINT (tem
));
880 write_string (tembuf
, -1);
884 if (EQ (symbol
, Qsignal
) || EQ (symbol
, Qexit
))
885 remove_process (proc
);
887 Findent_to (make_number (22), minspace
);
888 if (NILP (p
->buffer
))
889 insert_string ("(none)");
890 else if (NILP (XBUFFER (p
->buffer
)->name
))
891 insert_string ("(Killed)");
893 Finsert (1, &XBUFFER (p
->buffer
)->name
);
895 Findent_to (make_number (37), minspace
);
897 if (NETCONN_P (proc
))
899 sprintf (tembuf
, "(network stream connection to %s)\n",
900 XSTRING (p
->childp
)->data
);
901 insert_string (tembuf
);
915 insert_string ("\n");
921 DEFUN ("list-processes", Flist_processes
, Slist_processes
, 0, 0, "",
922 "Display a list of all processes.\n\
923 \(Any processes listed as Exited or Signaled are actually eliminated\n\
924 after the listing is made.)")
927 internal_with_output_to_temp_buffer ("*Process List*",
928 list_processes_1
, Qnil
);
932 DEFUN ("process-list", Fprocess_list
, Sprocess_list
, 0, 0, 0,
933 "Return a list of all processes.")
936 return Fmapcar (Qcdr
, Vprocess_alist
);
939 /* Starting asynchronous inferior processes. */
941 static Lisp_Object
start_process_unwind ();
943 DEFUN ("start-process", Fstart_process
, Sstart_process
, 3, MANY
, 0,
944 "Start a program in a subprocess. Return the process object for it.\n\
945 Args are NAME BUFFER PROGRAM &rest PROGRAM-ARGS\n\
946 NAME is name for process. It is modified if necessary to make it unique.\n\
947 BUFFER is the buffer or (buffer-name) to associate with the process.\n\
948 Process output goes at end of that buffer, unless you specify\n\
949 an output stream or filter function to handle the output.\n\
950 BUFFER may be also nil, meaning that this process is not associated\n\
952 Third arg is program file name. It is searched for as in the shell.\n\
953 Remaining arguments are strings to give program as arguments.")
956 register Lisp_Object
*args
;
958 Lisp_Object buffer
, name
, program
, proc
, current_dir
, tem
;
960 register unsigned char *new_argv
;
963 register unsigned char **new_argv
;
966 int count
= specpdl_ptr
- specpdl
;
970 buffer
= Fget_buffer_create (buffer
);
972 /* Make sure that the child will be able to chdir to the current
973 buffer's current directory, or its unhandled equivalent. We
974 can't just have the child check for an error when it does the
975 chdir, since it's in a vfork.
977 We have to GCPRO around this because Fexpand_file_name and
978 Funhandled_file_name_directory might call a file name handling
979 function. The argument list is protected by the caller, so all
980 we really have to worry about is buffer. */
982 struct gcpro gcpro1
, gcpro2
;
984 current_dir
= current_buffer
->directory
;
986 GCPRO2 (buffer
, current_dir
);
989 expand_and_dir_to_file
990 (Funhandled_file_name_directory (current_dir
, Qnil
));
991 if (NILP (Ffile_accessible_directory_p (current_dir
)))
992 report_file_error ("Setting current directory",
993 Fcons (current_buffer
->directory
, Qnil
));
999 CHECK_STRING (name
, 0);
1003 CHECK_STRING (program
, 2);
1006 /* Make a one member argv with all args concatenated
1007 together separated by a blank. */
1008 len
= XSTRING (program
)->size
+ 2;
1009 for (i
= 3; i
< nargs
; i
++)
1012 CHECK_STRING (tem
, i
);
1013 len
+= XSTRING (tem
)->size
+ 1; /* count the blank */
1015 new_argv
= (unsigned char *) alloca (len
);
1016 strcpy (new_argv
, XSTRING (program
)->data
);
1017 for (i
= 3; i
< nargs
; i
++)
1020 CHECK_STRING (tem
, i
);
1021 strcat (new_argv
, " ");
1022 strcat (new_argv
, XSTRING (tem
)->data
);
1024 /* Need to add code here to check for program existence on VMS */
1027 new_argv
= (unsigned char **) alloca ((nargs
- 1) * sizeof (char *));
1029 for (i
= 3; i
< nargs
; i
++)
1032 CHECK_STRING (tem
, i
);
1033 new_argv
[i
- 2] = XSTRING (tem
)->data
;
1035 new_argv
[i
- 2] = 0;
1036 new_argv
[0] = XSTRING (program
)->data
;
1038 /* If program file name is not absolute, search our path for it */
1039 if (new_argv
[0][0] != '/')
1042 openp (Vexec_path
, program
, "", &tem
, 1);
1044 report_file_error ("Searching for program", Fcons (program
, Qnil
));
1045 new_argv
[0] = XSTRING (tem
)->data
;
1047 #endif /* not VMS */
1049 proc
= make_process (name
);
1050 /* If an error occurs and we can't start the process, we want to
1051 remove it from the process list. This means that each error
1052 check in create_process doesn't need to call remove_process
1053 itself; it's all taken care of here. */
1054 record_unwind_protect (start_process_unwind
, proc
);
1056 XPROCESS (proc
)->childp
= Qt
;
1057 XPROCESS (proc
)->command_channel_p
= Qnil
;
1058 XPROCESS (proc
)->buffer
= buffer
;
1059 XPROCESS (proc
)->sentinel
= Qnil
;
1060 XPROCESS (proc
)->filter
= Qnil
;
1061 XPROCESS (proc
)->command
= Flist (nargs
- 2, args
+ 2);
1063 create_process (proc
, new_argv
, current_dir
);
1065 return unbind_to (count
, proc
);
1068 /* This function is the unwind_protect form for Fstart_process. If
1069 PROC doesn't have its pid set, then we know someone has signalled
1070 an error and the process wasn't started successfully, so we should
1071 remove it from the process list. */
1073 start_process_unwind (proc
)
1076 if (XTYPE (proc
) != Lisp_Process
)
1079 /* Was PROC started successfully? */
1080 if (XPROCESS (proc
)->pid
<= 0)
1081 remove_process (proc
);
1088 create_process_1 (signo
)
1092 /* USG systems forget handlers when they are used;
1093 must reestablish each time */
1094 signal (signo
, create_process_1
);
1098 #if 0 /* This doesn't work; see the note before sigchld_handler. */
1101 /* Mimic blocking of signals on system V, which doesn't really have it. */
1103 /* Nonzero means we got a SIGCHLD when it was supposed to be blocked. */
1104 int sigchld_deferred
;
1107 create_process_sigchld ()
1109 signal (SIGCHLD
, create_process_sigchld
);
1111 sigchld_deferred
= 1;
1117 #ifndef VMS /* VMS version of this function is in vmsproc.c. */
1118 create_process (process
, new_argv
, current_dir
)
1119 Lisp_Object process
;
1121 Lisp_Object current_dir
;
1123 int pid
, inchannel
, outchannel
, forkin
, forkout
;
1126 SIGTYPE (*sigchld
)();
1129 extern char **environ
;
1131 inchannel
= outchannel
= -1;
1134 if (EQ (Vprocess_connection_type
, Qt
))
1135 outchannel
= inchannel
= allocate_pty ();
1140 /* On USG systems it does not work to open the pty's tty here
1141 and then close and reopen it in the child. */
1143 /* Don't let this terminal become our controlling terminal
1144 (in case we don't have one). */
1145 forkout
= forkin
= open (pty_name
, O_RDWR
| O_NOCTTY
, 0);
1147 forkout
= forkin
= open (pty_name
, O_RDWR
, 0);
1150 report_file_error ("Opening pty", Qnil
);
1152 forkin
= forkout
= -1;
1153 #endif /* not USG */
1157 #endif /* HAVE_PTYS */
1160 if (socketpair (AF_UNIX
, SOCK_STREAM
, 0, sv
) < 0)
1161 report_file_error ("Opening socketpair", Qnil
);
1162 outchannel
= inchannel
= sv
[0];
1163 forkout
= forkin
= sv
[1];
1165 #else /* not SKTPAIR */
1174 #endif /* not SKTPAIR */
1177 /* Replaced by close_process_descs */
1178 set_exclusive_use (inchannel
);
1179 set_exclusive_use (outchannel
);
1182 /* Stride people say it's a mystery why this is needed
1183 as well as the O_NDELAY, but that it fails without this. */
1184 #if defined (STRIDE) || (defined (pfa) && defined (HAVE_PTYS))
1187 ioctl (inchannel
, FIONBIO
, &one
);
1192 fcntl (inchannel
, F_SETFL
, O_NONBLOCK
);
1195 fcntl (inchannel
, F_SETFL
, O_NDELAY
);
1199 /* Record this as an active process, with its channels.
1200 As a result, child_setup will close Emacs's side of the pipes. */
1201 chan_process
[inchannel
] = process
;
1202 XFASTINT (XPROCESS (process
)->infd
) = inchannel
;
1203 XFASTINT (XPROCESS (process
)->outfd
) = outchannel
;
1204 /* Record the tty descriptor used in the subprocess. */
1206 XPROCESS (process
)->subtty
= Qnil
;
1208 XFASTINT (XPROCESS (process
)->subtty
) = forkin
;
1209 XPROCESS (process
)->pty_flag
= (pty_flag
? Qt
: Qnil
);
1210 XPROCESS (process
)->status
= Qrun
;
1212 /* Delay interrupts until we have a chance to store
1213 the new fork's pid in its process structure */
1217 #else /* not BSD4_1 */
1218 #if defined (BSD) || defined (UNIPLUS) || defined (HPUX)
1219 sigsetmask (sigmask (SIGCHLD
));
1220 #else /* ordinary USG */
1222 sigchld_deferred
= 0;
1223 sigchld
= signal (SIGCHLD
, create_process_sigchld
);
1225 #endif /* ordinary USG */
1226 #endif /* not BSD4_1 */
1227 #endif /* SIGCHLD */
1229 /* Until we store the proper pid, enable sigchld_handler
1230 to recognize an unknown pid as standing for this process.
1231 It is very important not to let this `marker' value stay
1232 in the table after this function has returned; if it does
1233 it might cause call-process to hang and subsequent asynchronous
1234 processes to get their return values scrambled. */
1235 XSETINT (XPROCESS (process
)->pid
, -1);
1238 /* child_setup must clobber environ on systems with true vfork.
1239 Protect it from permanent change. */
1240 char **save_environ
= environ
;
1245 int xforkin
= forkin
;
1246 int xforkout
= forkout
;
1248 #if 0 /* This was probably a mistake--it duplicates code later on,
1249 but fails to handle all the cases. */
1250 /* Make sure SIGCHLD is not blocked in the child. */
1251 sigsetmask (SIGEMPTYMASK
);
1254 /* Make the pty be the controlling terminal of the process. */
1256 /* First, disconnect its current controlling terminal. */
1260 /* Make the pty's terminal the controlling terminal. */
1261 if (pty_flag
&& (ioctl (xforkin
, TIOCSCTTY
, 0) < 0))
1264 #else /* not HAVE_SETSID */
1266 /* It's very important to call setpgrp() here and no time
1267 afterwards. Otherwise, we lose our controlling tty which
1268 is set when we open the pty. */
1271 #endif /* not HAVE_SETSID */
1273 /* In 4.3BSD, the TIOCSPGRP bug has been fixed, and now you
1274 can do TIOCSPGRP only to the process's controlling tty. */
1277 /* I wonder: would just ioctl (0, TIOCNOTTY, 0) work here?
1278 I can't test it since I don't have 4.3. */
1279 int j
= open ("/dev/tty", O_RDWR
, 0);
1280 ioctl (j
, TIOCNOTTY
, 0);
1283 /* In order to get a controlling terminal on some versions
1284 of BSD, it is necessary to put the process in pgrp 0
1285 before it opens the terminal. */
1289 #endif /* TIOCNOTTY */
1291 #if !defined (RTU) && !defined (UNIPLUS)
1292 /*** There is a suggestion that this ought to be a
1293 conditional on TIOCSPGRP. */
1294 /* Now close the pty (if we had it open) and reopen it.
1295 This makes the pty the controlling terminal of the subprocess. */
1298 /* I wonder if close (open (pty_name, ...)) would work? */
1301 xforkout
= xforkin
= open (pty_name
, O_RDWR
, 0);
1306 #endif /* not UNIPLUS and not RTU */
1307 #ifdef SETUP_SLAVE_PTY
1309 #endif /* SETUP_SLAVE_PTY */
1311 /* On AIX, we've disabled SIGHUP above once we start a child on a pty.
1312 Now reenable it in the child, so it will die when we want it to. */
1314 signal (SIGHUP
, SIG_DFL
);
1316 #endif /* HAVE_PTYS */
1321 #else /* not BSD4_1 */
1322 #if defined (BSD) || defined (UNIPLUS) || defined (HPUX)
1323 sigsetmask (SIGEMPTYMASK
);
1324 #else /* ordinary USG */
1326 signal (SIGCHLD
, sigchld
);
1328 #endif /* ordinary USG */
1329 #endif /* not BSD4_1 */
1330 #endif /* SIGCHLD */
1332 child_setup_tty (xforkout
);
1333 child_setup (xforkin
, xforkout
, xforkout
,
1334 new_argv
, 1, current_dir
);
1336 environ
= save_environ
;
1340 report_file_error ("Doing vfork", Qnil
);
1342 XFASTINT (XPROCESS (process
)->pid
) = pid
;
1344 FD_SET (inchannel
, &input_wait_mask
);
1346 /* If the subfork execv fails, and it exits,
1347 this close hangs. I don't know why.
1348 So have an interrupt jar it loose. */
1350 signal (SIGALRM
, create_process_1
);
1353 /* OK to close only if it's not a pty. Otherwise we need to leave
1354 it open for ioctl to get pgrp when signals are sent, or to send
1355 the interrupt characters through if that's how we're signalling
1356 subprocesses. Alternately if you are concerned about running out
1357 of file descriptors, you could just save the tty name and open
1358 just to do the ioctl. */
1359 if (NILP (XFASTINT (XPROCESS (process
)->pty_flag
)))
1362 XPROCESS (process
)->subtty
= Qnil
;
1368 if (forkin
!= forkout
&& forkout
>= 0)
1374 #else /* not BSD4_1 */
1375 #if defined (BSD) || defined (UNIPLUS) || defined (HPUX)
1376 sigsetmask (SIGEMPTYMASK
);
1377 #else /* ordinary USG */
1379 signal (SIGCHLD
, sigchld
);
1380 /* Now really handle any of these signals
1381 that came in during this function. */
1382 if (sigchld_deferred
)
1383 kill (getpid (), SIGCHLD
);
1385 #endif /* ordinary USG */
1386 #endif /* not BSD4_1 */
1387 #endif /* SIGCHLD */
1389 #endif /* not VMS */
1393 /* open a TCP network connection to a given HOST/SERVICE. Treated
1394 exactly like a normal process when reading and writing. Only
1395 differences are in status display and process deletion. A network
1396 connection has no PID; you cannot signal it. All you can do is
1397 deactivate and close it via delete-process */
1399 DEFUN ("open-network-stream", Fopen_network_stream
, Sopen_network_stream
,
1401 "Open a TCP connection for a service to a host.\n\
1402 Returns a subprocess-object to represent the connection.\n\
1403 Input and output work as for subprocesses; `delete-process' closes it.\n\
1404 Args are NAME BUFFER HOST SERVICE.\n\
1405 NAME is name for process. It is modified if necessary to make it unique.\n\
1406 BUFFER is the buffer (or buffer-name) to associate with the process.\n\
1407 Process output goes at end of that buffer, unless you specify\n\
1408 an output stream or filter function to handle the output.\n\
1409 BUFFER may be also nil, meaning that this process is not associated\n\
1411 Third arg is name of the host to connect to, or its IP address.\n\
1412 Fourth arg SERVICE is name of the service desired, or an integer\n\
1413 specifying a port number to connect to.")
1414 (name
, buffer
, host
, service
)
1415 Lisp_Object name
, buffer
, host
, service
;
1419 struct sockaddr_in address
;
1420 struct servent
*svc_info
;
1421 struct hostent
*host_info_ptr
, host_info
;
1422 char *(addr_list
[2]);
1423 unsigned long numeric_addr
;
1427 struct hostent host_info_fixed
;
1428 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
;
1430 GCPRO4 (name
, buffer
, host
, service
);
1431 CHECK_STRING (name
, 0);
1432 CHECK_STRING (host
, 0);
1433 if (XTYPE(service
) == Lisp_Int
)
1434 port
= htons ((unsigned short) XINT (service
));
1437 CHECK_STRING (service
, 0);
1438 svc_info
= getservbyname (XSTRING (service
)->data
, "tcp");
1440 error ("Unknown service \"%s\"", XSTRING (service
)->data
);
1441 port
= svc_info
->s_port
;
1444 host_info_ptr
= gethostbyname (XSTRING (host
)->data
);
1445 if (host_info_ptr
== 0)
1446 /* Attempt to interpret host as numeric inet address */
1448 numeric_addr
= inet_addr (XSTRING (host
)->data
);
1449 if (numeric_addr
== -1)
1450 error ("Unknown host \"%s\"", XSTRING (host
)->data
);
1452 host_info_ptr
= &host_info
;
1453 host_info
.h_name
= 0;
1454 host_info
.h_aliases
= 0;
1455 host_info
.h_addrtype
= AF_INET
;
1456 host_info
.h_addr_list
= &(addr_list
[0]);
1457 addr_list
[0] = (char*)(&numeric_addr
);
1459 host_info
.h_length
= strlen (addr_list
[0]);
1462 bzero (&address
, sizeof address
);
1463 bcopy (host_info_ptr
->h_addr
, (char *) &address
.sin_addr
,
1464 host_info_ptr
->h_length
);
1465 address
.sin_family
= host_info_ptr
->h_addrtype
;
1466 address
.sin_port
= port
;
1468 s
= socket (host_info_ptr
->h_addrtype
, SOCK_STREAM
, 0);
1470 report_file_error ("error creating socket", Fcons (name
, Qnil
));
1473 if (connect (s
, &address
, sizeof address
) == -1)
1480 report_file_error ("connection failed",
1481 Fcons (host
, Fcons (name
, Qnil
)));
1487 report_file_error ("error duplicating socket", Fcons (name
, Qnil
));
1490 buffer
= Fget_buffer_create (buffer
);
1491 proc
= make_process (name
);
1493 chan_process
[inch
] = proc
;
1496 fcntl (inch
, F_SETFL
, O_NONBLOCK
);
1499 fcntl (inch
, F_SETFL
, O_NDELAY
);
1503 XPROCESS (proc
)->childp
= host
;
1504 XPROCESS (proc
)->command_channel_p
= Qnil
;
1505 XPROCESS (proc
)->buffer
= buffer
;
1506 XPROCESS (proc
)->sentinel
= Qnil
;
1507 XPROCESS (proc
)->filter
= Qnil
;
1508 XPROCESS (proc
)->command
= Qnil
;
1509 XPROCESS (proc
)->pid
= Qnil
;
1510 XFASTINT (XPROCESS (proc
)->infd
) = s
;
1511 XFASTINT (XPROCESS (proc
)->outfd
) = outch
;
1512 XPROCESS (proc
)->status
= Qrun
;
1513 FD_SET (inch
, &input_wait_mask
);
1518 #endif /* HAVE_SOCKETS */
1520 deactivate_process (proc
)
1523 register int inchannel
, outchannel
;
1524 register struct Lisp_Process
*p
= XPROCESS (proc
);
1526 inchannel
= XFASTINT (p
->infd
);
1527 outchannel
= XFASTINT (p
->outfd
);
1531 /* Beware SIGCHLD hereabouts. */
1532 flush_pending_output (inchannel
);
1535 VMS_PROC_STUFF
*get_vms_process_pointer (), *vs
;
1536 sys$
dassgn (outchannel
);
1537 vs
= get_vms_process_pointer (p
->pid
)
1539 give_back_vms_process_stuff (vs
);
1543 if (outchannel
&& outchannel
!= inchannel
)
1547 XFASTINT (p
->infd
) = 0;
1548 XFASTINT (p
->outfd
) = 0;
1549 chan_process
[inchannel
] = Qnil
;
1550 FD_CLR (inchannel
, &input_wait_mask
);
1554 /* Close all descriptors currently in use for communication
1555 with subprocess. This is used in a newly-forked subprocess
1556 to get rid of irrelevant descriptors. */
1558 close_process_descs ()
1561 for (i
= 0; i
< MAXDESC
; i
++)
1563 Lisp_Object process
;
1564 process
= chan_process
[i
];
1565 if (!NILP (process
))
1567 int in
= XFASTINT (XPROCESS (process
)->infd
);
1568 int out
= XFASTINT (XPROCESS (process
)->outfd
);
1571 if (out
&& in
!= out
)
1577 DEFUN ("accept-process-output", Faccept_process_output
, Saccept_process_output
,
1579 "Allow any pending output from subprocesses to be read by Emacs.\n\
1580 It is read into the process' buffers or given to their filter functions.\n\
1581 Non-nil arg PROCESS means do not return until some output has been received\n\
1583 Non-nil second arg TIMEOUT and third arg TIMEOUT-MSECS are number of\n\
1584 seconds and microseconds to wait; return after that much time whether\n\
1585 or not there is input.\n\
1586 Return non-nil iff we received any output before the timeout expired.")
1587 (proc
, timeout
, timeout_msecs
)
1588 register Lisp_Object proc
, timeout
, timeout_msecs
;
1593 if (! NILP (timeout_msecs
))
1595 CHECK_NUMBER (timeout_msecs
, 2);
1596 useconds
= XINT (timeout_msecs
);
1597 if (XTYPE (timeout
) != Lisp_Int
)
1598 XSET (timeout
, Lisp_Int
, 0);
1601 int carry
= useconds
/ 1000000;
1603 XSETINT (timeout
, XINT (timeout
) + carry
);
1604 useconds
-= carry
* 1000000;
1606 /* I think this clause is necessary because C doesn't
1607 guarantee a particular rounding direction for negative
1611 XSETINT (timeout
, XINT (timeout
) - 1);
1612 useconds
+= 1000000;
1619 if (! NILP (timeout
))
1621 CHECK_NUMBER (timeout
, 1);
1622 seconds
= XINT (timeout
);
1635 XFASTINT (proc
) = 0;
1638 (wait_reading_process_input (seconds
, useconds
, proc
, 0)
1642 /* This variable is different from waiting_for_input in keyboard.c.
1643 It is used to communicate to a lisp process-filter/sentinel (via the
1644 function Fwaiting_for_user_input_p below) whether emacs was waiting
1645 for user-input when that process-filter was called.
1646 waiting_for_input cannot be used as that is by definition 0 when
1647 lisp code is being evalled */
1648 static int waiting_for_user_input_p
;
1650 /* Read and dispose of subprocess output while waiting for timeout to
1651 elapse and/or keyboard input to be available.
1654 timeout in seconds, or
1655 zero for no limit, or
1656 -1 means gobble data immediately available but don't wait for any.
1658 read_kbd is a lisp value:
1659 0 to ignore keyboard input, or
1660 1 to return when input is available, or
1661 -1 means caller will actually read the input, so don't throw to
1662 the quit handler, or
1663 a process object, meaning wait until something arrives from that
1664 process. The return value is true iff we read some input from
1667 do_display != 0 means redisplay should be done to show subprocess
1668 output that arrives.
1670 If read_kbd is a pointer to a struct Lisp_Process, then the
1671 function returns true iff we received input from that process
1672 before the timeout elapsed.
1673 Otherwise, return true iff we recieved input from any process. */
1675 wait_reading_process_input (time_limit
, microsecs
, read_kbd
, do_display
)
1676 int time_limit
, microsecs
;
1677 Lisp_Object read_kbd
;
1680 register int channel
, nfds
, m
;
1681 static SELECT_TYPE Available
;
1684 EMACS_TIME timeout
, end_time
, garbage
;
1686 int wait_channel
= 0;
1687 struct Lisp_Process
*wait_proc
= 0;
1688 int got_some_input
= 0;
1690 FD_ZERO (&Available
);
1692 /* If read_kbd is a process to watch, set wait_proc and wait_channel
1694 if (XTYPE (read_kbd
) == Lisp_Process
)
1696 wait_proc
= XPROCESS (read_kbd
);
1697 wait_channel
= XFASTINT (wait_proc
->infd
);
1698 XFASTINT (read_kbd
) = 0;
1701 waiting_for_user_input_p
= XINT (read_kbd
);
1703 /* Since we may need to wait several times,
1704 compute the absolute time to return at. */
1705 if (time_limit
|| microsecs
)
1707 EMACS_GET_TIME (end_time
);
1708 EMACS_SET_SECS_USECS (timeout
, time_limit
, microsecs
);
1709 EMACS_ADD_TIME (end_time
, end_time
, timeout
);
1714 /* If calling from keyboard input, do not quit
1715 since we want to return C-g as an input character.
1716 Otherwise, do pending quit if requested. */
1717 if (XINT (read_kbd
) >= 0)
1720 /* If status of something has changed, and no input is available,
1721 notify the user of the change right away */
1722 if (update_tick
!= process_tick
&& do_display
)
1724 Atemp
= input_wait_mask
;
1725 EMACS_SET_SECS_USECS (timeout
, 0, 0);
1726 if (select (MAXDESC
, &Atemp
, 0, 0, &timeout
) <= 0)
1730 /* Don't wait for output from a non-running process. */
1731 if (wait_proc
!= 0 && !NILP (wait_proc
->raw_status_low
))
1732 update_status (wait_proc
);
1734 && ! EQ (wait_proc
->status
, Qrun
))
1737 /* Compute time from now till when time limit is up */
1738 /* Exit if already run out */
1739 if (time_limit
== -1)
1741 /* -1 specified for timeout means
1742 gobble output available now
1743 but don't wait at all. */
1745 EMACS_SET_SECS_USECS (timeout
, 0, 0);
1747 else if (time_limit
|| microsecs
)
1749 EMACS_GET_TIME (timeout
);
1750 EMACS_SUB_TIME (timeout
, end_time
, timeout
);
1751 if (EMACS_TIME_NEG_P (timeout
))
1756 EMACS_SET_SECS_USECS (timeout
, 100000, 0);
1759 /* Cause C-g and alarm signals to take immediate action,
1760 and cause input available signals to zero out timeout */
1761 if (XINT (read_kbd
) < 0)
1762 set_waiting_for_input (&timeout
);
1764 /* Wait till there is something to do */
1766 Available
= input_wait_mask
;
1767 if (! XINT (read_kbd
))
1768 FD_CLR (0, &Available
);
1770 /* If frame size has changed or the window is newly mapped,
1771 redisplay now, before we start to wait. There is a race
1772 condition here; if a SIGIO arrives between now and the select
1773 and indicates that a frame is trashed, the select may block
1774 displaying a trashed screen. */
1776 redisplay_preserve_echo_area ();
1778 if (XINT (read_kbd
) && detect_input_pending ())
1781 nfds
= select (MAXDESC
, &Available
, 0, 0, &timeout
);
1785 /* Make C-g and alarm signals set flags again */
1786 clear_waiting_for_input ();
1788 /* If we woke up due to SIGWINCH, actually change size now. */
1789 do_pending_window_change ();
1791 if (time_limit
&& nfds
== 0) /* timeout elapsed */
1795 if (xerrno
== EINTR
)
1796 FD_ZERO (&Available
);
1798 /* Ultrix select seems to return ENOMEM when it is
1799 interrupted. Treat it just like EINTR. Bleah. Note
1800 that we want to test for the "ultrix" CPP symbol, not
1801 "__ultrix__"; the latter is only defined under GCC, but
1802 not by DEC's bundled CC. -JimB */
1803 else if (xerrno
== ENOMEM
)
1804 FD_ZERO (&Available
);
1807 /* This happens for no known reason on ALLIANT.
1808 I am guessing that this is the right response. -- RMS. */
1809 else if (xerrno
== EFAULT
)
1810 FD_ZERO (&Available
);
1812 else if (xerrno
== EBADF
)
1815 /* AIX doesn't handle PTY closure the same way BSD does. On AIX,
1816 the child's closure of the pts gives the parent a SIGHUP, and
1817 the ptc file descriptor is automatically closed,
1818 yielding EBADF here or at select() call above.
1819 So, SIGHUP is ignored (see def of PTY_TTY_NAME_SPRINTF
1820 in m-ibmrt-aix.h), and here we just ignore the select error.
1821 Cleanup occurs c/o status_notify after SIGCLD. */
1822 FD_ZERO (&Available
); /* Cannot depend on values returned */
1828 error("select error: %s", sys_errlist
[xerrno
]);
1831 else if (nfds
> 0 && FD_ISSET (0, &Available
) && interrupt_input
)
1832 /* System sometimes fails to deliver SIGIO. */
1833 kill (getpid (), SIGIO
);
1836 /* Check for keyboard input */
1837 /* If there is any, return immediately
1838 to give it higher priority than subprocesses */
1840 if (XINT (read_kbd
) && detect_input_pending ())
1844 /* If we think we have keyboard input waiting, but didn't get SIGIO
1845 go read it. This can happen with X on BSD after logging out.
1846 In that case, there really is no input and no SIGIO,
1847 but select says there is input. */
1850 if (XINT (read_kbd) && interrupt_input && (Available & fileno (stdin)))
1852 if (XINT (read_kbd
) && interrupt_input
&& (FD_ISSET (fileno (stdin
), &Available
)))
1857 /* Check for connection from other process */
1859 if (Available
& ChannelMask (comm_server
))
1861 Available
&= ~(ChannelMask (comm_server
));
1867 got_some_input
|= nfds
> 0;
1869 /* If checking input just got us a size-change event from X,
1870 obey it now if we should. */
1871 if (XINT (read_kbd
))
1872 do_pending_window_change ();
1874 /* Check for data from a process or a command channel */
1875 for (channel
= FIRST_PROC_DESC
; channel
< MAXDESC
; channel
++)
1877 if (FD_ISSET (channel
, &Available
))
1881 /* If waiting for this channel, arrange to return as
1882 soon as no more input to be processed. No more
1884 if (wait_channel
== channel
)
1890 proc
= chan_process
[channel
];
1895 /* It's a command channel */
1896 if (!NILP (XPROCESS (proc
)->command_channel_p
))
1898 ProcessCommChan (channel
, proc
);
1899 if (NILP (XPROCESS (proc
)->command_channel_p
))
1901 /* It has ceased to be a command channel! */
1902 int bytes_available
;
1903 if (ioctl (channel
, FIONREAD
, &bytes_available
) < 0)
1904 bytes_available
= 0;
1905 if (bytes_available
)
1906 FD_SET (channel
, &Available
);
1912 /* Read data from the process, starting with our
1913 buffered-ahead character if we have one. */
1915 nread
= read_process_output (proc
, channel
);
1918 /* Since read_process_output can run a filter,
1919 which can call accept-process-output,
1920 don't try to read from any other processes
1921 before doing the select again. */
1922 FD_ZERO (&Available
);
1925 redisplay_preserve_echo_area ();
1928 else if (nread
== -1 && errno
== EWOULDBLOCK
)
1932 else if (nread
== -1 && errno
== EAGAIN
)
1936 else if (nread
== -1 && errno
== EAGAIN
)
1938 /* Note that we cannot distinguish between no input
1939 available now and a closed pipe.
1940 With luck, a closed pipe will be accompanied by
1941 subprocess termination and SIGCHLD. */
1942 else if (nread
== 0 && !NETCONN_P (proc
))
1944 #endif /* O_NDELAY */
1945 #endif /* O_NONBLOCK */
1946 #endif /* EWOULDBLOCK */
1948 /* On some OSs with ptys, when the process on one end of
1949 a pty exits, the other end gets an error reading with
1950 errno = EIO instead of getting an EOF (0 bytes read).
1951 Therefore, if we get an error reading and errno =
1952 EIO, just continue, because the child process has
1953 exited and should clean itself up soon (e.g. when we
1955 else if (nread
== -1 && errno
== EIO
)
1957 #endif /* HAVE_PTYS */
1958 /* If we can detect process termination, don't consider the process
1959 gone just because its pipe is closed. */
1961 else if (nread
== 0 && !NETCONN_P (proc
))
1966 /* Preserve status of processes already terminated. */
1967 XSETINT (XPROCESS (proc
)->tick
, ++process_tick
);
1968 deactivate_process (proc
);
1969 if (!NILP (XPROCESS (proc
)->raw_status_low
))
1970 update_status (XPROCESS (proc
));
1971 if (EQ (XPROCESS (proc
)->status
, Qrun
))
1972 XPROCESS (proc
)->status
1973 = Fcons (Qexit
, Fcons (make_number (256), Qnil
));
1976 } /* end for each file descriptor */
1977 } /* end while exit conditions not met */
1979 /* If calling from keyboard input, do not quit
1980 since we want to return C-g as an input character.
1981 Otherwise, do pending quit if requested. */
1982 if (XINT (read_kbd
) >= 0)
1984 /* Prevent input_pending from remaining set if we quit. */
1985 clear_input_pending ();
1989 return got_some_input
;
1992 /* Read pending output from the process channel,
1993 starting with our buffered-ahead character if we have one.
1994 Yield number of characters read.
1996 This function reads at most 1024 characters.
1997 If you want to read all available subprocess output,
1998 you must call it repeatedly until it returns zero. */
2000 read_process_output (proc
, channel
)
2002 register int channel
;
2004 register int nchars
;
2010 register Lisp_Object outstream
;
2011 register struct buffer
*old
= current_buffer
;
2012 register struct Lisp_Process
*p
= XPROCESS (proc
);
2013 register int opoint
;
2016 VMS_PROC_STUFF
*vs
, *get_vms_process_pointer();
2018 vs
= get_vms_process_pointer (p
->pid
);
2022 return(0); /* Really weird if it does this */
2023 if (!(vs
->iosb
[0] & 1))
2024 return -1; /* I/O error */
2027 error ("Could not get VMS process pointer");
2028 chars
= vs
->inputBuffer
;
2029 nchars
= clean_vms_buffer (chars
, vs
->iosb
[1]);
2032 start_vms_process_read (vs
); /* Crank up the next read on the process */
2033 return 1; /* Nothing worth printing, say we got 1 */
2037 if (proc_buffered_char
[channel
] < 0)
2038 nchars
= read (channel
, chars
, sizeof chars
);
2041 chars
[0] = proc_buffered_char
[channel
];
2042 proc_buffered_char
[channel
] = -1;
2043 nchars
= read (channel
, chars
+ 1, sizeof chars
- 1);
2047 nchars
= nchars
+ 1;
2049 #endif /* not VMS */
2051 if (nchars
<= 0) return nchars
;
2053 outstream
= p
->filter
;
2054 if (!NILP (outstream
))
2056 /* We inhibit quit here instead of just catching it so that
2057 hitting ^G when a filter happens to be running won't screw
2059 int count
= specpdl_ptr
- specpdl
;
2060 specbind (Qinhibit_quit
, Qt
);
2061 call2 (outstream
, proc
, make_string (chars
, nchars
));
2064 start_vms_process_read (vs
);
2070 /* If no filter, write into buffer if it isn't dead. */
2071 if (!NILP (p
->buffer
) && !NILP (XBUFFER (p
->buffer
)->name
))
2073 Lisp_Object old_read_only
;
2074 Lisp_Object old_begv
, old_zv
;
2076 Fset_buffer (p
->buffer
);
2078 old_read_only
= current_buffer
->read_only
;
2079 XFASTINT (old_begv
) = BEGV
;
2080 XFASTINT (old_zv
) = ZV
;
2082 current_buffer
->read_only
= Qnil
;
2084 /* Insert new output into buffer
2085 at the current end-of-output marker,
2086 thus preserving logical ordering of input and output. */
2087 if (XMARKER (p
->mark
)->buffer
)
2088 SET_PT (marker_position (p
->mark
));
2092 /* If the output marker is outside of the visible region, save
2093 the restriction and widen. */
2094 if (! (BEGV
<= point
&& point
<= ZV
))
2097 /* Make sure opoint floats ahead of any new text, just as point
2099 if (point
<= opoint
)
2102 /* Insert after old_begv, but before old_zv. */
2103 if (point
< XFASTINT (old_begv
))
2104 XFASTINT (old_begv
) += nchars
;
2105 if (point
<= XFASTINT (old_zv
))
2106 XFASTINT (old_zv
) += nchars
;
2108 /* Insert before markers in case we are inserting where
2109 the buffer's mark is, and the user's next command is Meta-y. */
2110 insert_before_markers (chars
, nchars
);
2111 Fset_marker (p
->mark
, make_number (point
), p
->buffer
);
2113 update_mode_lines
++;
2115 /* If the restriction isn't what it should be, set it. */
2116 if (XFASTINT (old_begv
) != BEGV
|| XFASTINT (old_zv
) != ZV
)
2117 Fnarrow_to_region (old_begv
, old_zv
);
2119 current_buffer
->read_only
= old_read_only
;
2121 set_buffer_internal (old
);
2124 start_vms_process_read (vs
);
2129 DEFUN ("waiting-for-user-input-p", Fwaiting_for_user_input_p
, Swaiting_for_user_input_p
,
2131 "Returns non-NIL if emacs is waiting for input from the user.\n\
2132 This is intended for use by asynchronous process output filters and sentinels.")
2135 return ((waiting_for_user_input_p
) ? Qt
: Qnil
);
2138 /* Sending data to subprocess */
2140 jmp_buf send_process_frame
;
2143 send_process_trap ()
2149 longjmp (send_process_frame
, 1);
2152 send_process (proc
, buf
, len
)
2157 /* Don't use register vars; longjmp can lose them. */
2159 unsigned char *procname
= XSTRING (XPROCESS (proc
)->name
)->data
;
2163 struct Lisp_Process
*p
= XPROCESS (proc
);
2164 VMS_PROC_STUFF
*vs
, *get_vms_process_pointer();
2167 if (! NILP (XPROCESS (proc
)->raw_status_low
))
2168 update_status (XPROCESS (proc
));
2169 if (! EQ (XPROCESS (proc
)->status
, Qrun
))
2170 error ("Process %s not running", procname
);
2173 vs
= get_vms_process_pointer (p
->pid
);
2175 error ("Could not find this process: %x", p
->pid
);
2176 else if (write_to_vms_process (vs
, buf
, len
))
2179 if (!setjmp (send_process_frame
))
2183 SIGTYPE (*old_sigpipe
)();
2185 /* Don't send more than 500 bytes at a time. */
2188 old_sigpipe
= (SIGTYPE (*) ()) signal (SIGPIPE
, send_process_trap
);
2189 rv
= write (XFASTINT (XPROCESS (proc
)->outfd
), buf
, this);
2190 signal (SIGPIPE
, old_sigpipe
);
2195 || errno
== EWOULDBLOCK
2202 /* It would be nice to accept process output here,
2203 but that is difficult. For example, it could
2204 garbage what we are sending if that is from a buffer. */
2211 report_file_error ("writing to process", Fcons (proc
, Qnil
));
2215 /* Allow input from processes between bursts of sending.
2216 Otherwise things may get stopped up. */
2221 XFASTINT (zero
) = 0;
2222 wait_reading_process_input (-1, 0, zero
, 0);
2228 XPROCESS (proc
)->raw_status_low
= Qnil
;
2229 XPROCESS (proc
)->raw_status_high
= Qnil
;
2230 XPROCESS (proc
)->status
= Fcons (Qexit
, Fcons (make_number (256), Qnil
));
2231 XSETINT (XPROCESS (proc
)->tick
, ++process_tick
);
2232 deactivate_process (proc
);
2234 error ("Error writing to process %s; closed it", procname
);
2236 error ("SIGPIPE raised on process %s; closed it", procname
);
2241 DEFUN ("process-send-region", Fprocess_send_region
, Sprocess_send_region
,
2243 "Send current contents of region as input to PROCESS.\n\
2244 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
2245 nil, indicating the current buffer's process.\n\
2246 Called from program, takes three arguments, PROCESS, START and END.\n\
2247 If the region is more than 500 characters long,\n\
2248 it is sent in several bunches. This may happen even for shorter regions.\n\
2249 Output from processes can arrive in between bunches.")
2250 (process
, start
, end
)
2251 Lisp_Object process
, start
, end
;
2256 proc
= get_process (process
);
2257 validate_region (&start
, &end
);
2259 if (XINT (start
) < GPT
&& XINT (end
) > GPT
)
2262 start1
= XINT (start
);
2263 send_process (proc
, &FETCH_CHAR (start1
), XINT (end
) - XINT (start
));
2268 DEFUN ("process-send-string", Fprocess_send_string
, Sprocess_send_string
,
2270 "Send PROCESS the contents of STRING as input.\n\
2271 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
2272 nil, indicating the current buffer's process.\n\
2273 If STRING is more than 500 characters long,\n\
2274 it is sent in several bunches. This may happen even for shorter strings.\n\
2275 Output from processes can arrive in between bunches.")
2277 Lisp_Object process
, string
;
2280 CHECK_STRING (string
, 1);
2281 proc
= get_process (process
);
2282 send_process (proc
, XSTRING (string
)->data
, XSTRING (string
)->size
);
2286 /* send a signal number SIGNO to PROCESS.
2287 CURRENT_GROUP means send to the process group that currently owns
2288 the terminal being used to communicate with PROCESS.
2289 This is used for various commands in shell mode.
2290 If NOMSG is zero, insert signal-announcements into process's buffers
2293 If we can, we try to signal PROCESS by sending control characters
2294 down the pipe. This allows us to signal inferiors who have changed
2295 their uid, for which killpg would return an EPERM error. */
2298 process_send_signal (process
, signo
, current_group
, nomsg
)
2299 Lisp_Object process
;
2301 Lisp_Object current_group
;
2305 register struct Lisp_Process
*p
;
2309 proc
= get_process (process
);
2310 p
= XPROCESS (proc
);
2312 if (!EQ (p
->childp
, Qt
))
2313 error ("Process %s is not a subprocess",
2314 XSTRING (p
->name
)->data
);
2315 if (!XFASTINT (p
->infd
))
2316 error ("Process %s is not active",
2317 XSTRING (p
->name
)->data
);
2319 if (NILP (p
->pty_flag
))
2320 current_group
= Qnil
;
2322 /* If we are using pgrps, get a pgrp number and make it negative. */
2323 if (!NILP (current_group
))
2325 #ifdef SIGNALS_VIA_CHARACTERS
2326 /* If possible, send signals to the entire pgrp
2327 by sending an input character to it. */
2329 /* On Berkeley descendants, the following IOCTL's retrieve the
2330 current control characters. */
2331 #if defined (TIOCGLTC) && defined (TIOCGETC)
2339 ioctl (XFASTINT (p
->infd
), TIOCGETC
, &c
);
2340 send_process (proc
, &c
.t_intrc
, 1);
2343 ioctl (XFASTINT (p
->infd
), TIOCGETC
, &c
);
2344 send_process (proc
, &c
.t_quitc
, 1);
2348 ioctl (XFASTINT (p
->infd
), TIOCGLTC
, &lc
);
2349 send_process (proc
, &lc
.t_suspc
, 1);
2351 #endif /* ! defined (SIGTSTP) */
2354 #else /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
2356 /* On SYSV descendants, the TCGETA ioctl retrieves the current control
2363 ioctl (XFASTINT (p
->infd
), TCGETA
, &t
);
2364 send_process (proc
, &t
.c_cc
[VINTR
], 1);
2367 ioctl (XFASTINT (p
->infd
), TCGETA
, &t
);
2368 send_process (proc
, &t
.c_cc
[VQUIT
], 1);
2372 ioctl (XFASTINT (p
->infd
), TCGETA
, &t
);
2373 send_process (proc
, &t
.c_cc
[VSWTCH
], 1);
2375 #endif /* ! defined (SIGTSTP) */
2377 #else /* ! defined (TCGETA) */
2378 Your configuration files are messed up
.
2379 /* If your system configuration files define SIGNALS_VIA_CHARACTERS,
2380 you'd better be using one of the alternatives above! */
2381 #endif /* ! defined (TCGETA) */
2382 #endif /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
2383 #endif /* ! defined (SIGNALS_VIA_CHARACTERS) */
2386 /* Get the pgrp using the tty itself, if we have that.
2387 Otherwise, use the pty to get the pgrp.
2388 On pfa systems, saka@pfu.fujitsu.co.JP writes:
2389 "TIOCGPGRP symbol defined in sys/ioctl.h at E50.
2390 But, TIOCGPGRP does not work on E50 ;-P works fine on E60"
2391 His patch indicates that if TIOCGPGRP returns an error, then
2392 we should just assume that p->pid is also the process group id. */
2396 if (!NILP (p
->subtty
))
2397 err
= ioctl (XFASTINT (p
->subtty
), TIOCGPGRP
, &gid
);
2399 err
= ioctl (XFASTINT (p
->infd
), TIOCGPGRP
, &gid
);
2403 gid
= - XFASTINT (p
->pid
);
2404 #endif /* ! defined (pfa) */
2410 #else /* ! defined (TIOCGPGRP ) */
2411 /* Can't select pgrps on this system, so we know that
2412 the child itself heads the pgrp. */
2413 gid
= - XFASTINT (p
->pid
);
2414 #endif /* ! defined (TIOCGPGRP ) */
2417 gid
= - XFASTINT (p
->pid
);
2423 p
->raw_status_low
= Qnil
;
2424 p
->raw_status_high
= Qnil
;
2426 XSETINT (p
->tick
, ++process_tick
);
2430 #endif /* ! defined (SIGCONT) */
2433 send_process (proc
, "\003", 1); /* ^C */
2438 send_process (proc
, "\031", 1); /* ^Y */
2443 sys$
forcex (&(XFASTINT (p
->pid
)), 0, 1);
2446 flush_pending_output (XFASTINT (p
->infd
));
2450 /* If we don't have process groups, send the signal to the immediate
2451 subprocess. That isn't really right, but it's better than any
2452 obvious alternative. */
2455 kill (XFASTINT (p
->pid
), signo
);
2459 /* gid may be a pid, or minus a pgrp's number */
2461 if (!NILP (current_group
))
2462 ioctl (XFASTINT (p
->infd
), TIOCSIGSEND
, signo
);
2465 gid
= - XFASTINT (p
->pid
);
2468 #else /* ! defined (TIOCSIGSEND) */
2469 EMACS_KILLPG (-gid
, signo
);
2470 #endif /* ! defined (TIOCSIGSEND) */
2473 DEFUN ("interrupt-process", Finterrupt_process
, Sinterrupt_process
, 0, 2, 0,
2474 "Interrupt process PROCESS. May be process or name of one.\n\
2475 PROCESS may be a process, a buffer, or the name of a process or buffer.\n\
2476 Nil or no arg means current buffer's process.\n\
2477 Second arg CURRENT-GROUP non-nil means send signal to\n\
2478 the current process-group of the process's controlling terminal\n\
2479 rather than to the process's own process group.\n\
2480 If the process is a shell, this means interrupt current subjob\n\
2481 rather than the shell.")
2482 (process
, current_group
)
2483 Lisp_Object process
, current_group
;
2485 process_send_signal (process
, SIGINT
, current_group
, 0);
2489 DEFUN ("kill-process", Fkill_process
, Skill_process
, 0, 2, 0,
2490 "Kill process PROCESS. May be process or name of one.\n\
2491 See function `interrupt-process' for more details on usage.")
2492 (process
, current_group
)
2493 Lisp_Object process
, current_group
;
2495 process_send_signal (process
, SIGKILL
, current_group
, 0);
2499 DEFUN ("quit-process", Fquit_process
, Squit_process
, 0, 2, 0,
2500 "Send QUIT signal to process PROCESS. May be process or name of one.\n\
2501 See function `interrupt-process' for more details on usage.")
2502 (process
, current_group
)
2503 Lisp_Object process
, current_group
;
2505 process_send_signal (process
, SIGQUIT
, current_group
, 0);
2509 DEFUN ("stop-process", Fstop_process
, Sstop_process
, 0, 2, 0,
2510 "Stop process PROCESS. May be process or name of one.\n\
2511 See function `interrupt-process' for more details on usage.")
2512 (process
, current_group
)
2513 Lisp_Object process
, current_group
;
2516 error ("no SIGTSTP support");
2518 process_send_signal (process
, SIGTSTP
, current_group
, 0);
2523 DEFUN ("continue-process", Fcontinue_process
, Scontinue_process
, 0, 2, 0,
2524 "Continue process PROCESS. May be process or name of one.\n\
2525 See function `interrupt-process' for more details on usage.")
2526 (process
, current_group
)
2527 Lisp_Object process
, current_group
;
2530 process_send_signal (process
, SIGCONT
, current_group
, 0);
2532 error ("no SIGCONT support");
2537 DEFUN ("signal-process", Fsignal_process
, Ssignal_process
,
2538 2, 2, "nProcess number: \nnSignal code: ",
2539 "Send the process with number PID the signal with code CODE.\n\
2540 Both PID and CODE are integers.")
2542 Lisp_Object pid
, sig
;
2544 CHECK_NUMBER (pid
, 0);
2545 CHECK_NUMBER (sig
, 1);
2546 return make_number (kill (XINT (pid
), XINT (sig
)));
2549 DEFUN ("process-send-eof", Fprocess_send_eof
, Sprocess_send_eof
, 0, 1, 0,
2550 "Make PROCESS see end-of-file in its input.\n\
2551 Eof comes after any text already sent to it.\n\
2552 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
2553 nil, indicating the current buffer's process.")
2555 Lisp_Object process
;
2559 proc
= get_process (process
);
2560 /* Sending a zero-length record is supposed to mean eof
2561 when TIOCREMOTE is turned on. */
2565 write (XFASTINT (XPROCESS (proc
)->outfd
), buf
, 0);
2567 #else /* did not do TOICREMOTE */
2569 send_process (proc
, "\032", 1); /* ^z */
2571 if (!NILP (XPROCESS (proc
)->pty_flag
))
2572 send_process (proc
, "\004", 1);
2575 close (XPROCESS (proc
)->outfd
);
2576 XFASTINT (XPROCESS (proc
)->outfd
) = open ("/dev/null", O_WRONLY
);
2579 #endif /* did not do TOICREMOTE */
2583 /* Kill all processes associated with `buffer'.
2584 If `buffer' is nil, kill all processes */
2586 kill_buffer_processes (buffer
)
2589 Lisp_Object tail
, proc
;
2591 for (tail
= Vprocess_alist
; XGCTYPE (tail
) == Lisp_Cons
;
2592 tail
= XCONS (tail
)->cdr
)
2594 proc
= XCONS (XCONS (tail
)->car
)->cdr
;
2595 if (XGCTYPE (proc
) == Lisp_Process
2596 && (NILP (buffer
) || EQ (XPROCESS (proc
)->buffer
, buffer
)))
2598 if (NETCONN_P (proc
))
2599 deactivate_process (proc
);
2600 else if (XFASTINT (XPROCESS (proc
)->infd
))
2601 process_send_signal (proc
, SIGHUP
, Qnil
, 1);
2606 /* On receipt of a signal that a child status has changed,
2607 loop asking about children with changed statuses until
2608 the system says there are no more.
2609 All we do is change the status;
2610 we do not run sentinels or print notifications.
2611 That is saved for the next time keyboard input is done,
2612 in order to avoid timing errors. */
2614 /** WARNING: this can be called during garbage collection.
2615 Therefore, it must not be fooled by the presence of mark bits in
2618 /** USG WARNING: Although it is not obvious from the documentation
2619 in signal(2), on a USG system the SIGCLD handler MUST NOT call
2620 signal() before executing at least one wait(), otherwise the handler
2621 will be called again, resulting in an infinite loop. The relevant
2622 portion of the documentation reads "SIGCLD signals will be queued
2623 and the signal-catching function will be continually reentered until
2624 the queue is empty". Invoking signal() causes the kernel to reexamine
2625 the SIGCLD queue. Fred Fish, UniSoft Systems Inc. */
2628 sigchld_handler (signo
)
2631 int old_errno
= errno
;
2633 register struct Lisp_Process
*p
;
2637 sigheld
|= sigbit (SIGCHLD
);
2649 #endif /* no WUNTRACED */
2650 /* Keep trying to get a status until we get a definitive result. */
2654 pid
= wait3 (&w
, WNOHANG
| WUNTRACED
, 0);
2656 while (pid
<= 0 && errno
== EINTR
);
2660 /* A real failure. We have done all our job, so return. */
2662 /* USG systems forget handlers when they are used;
2663 must reestablish each time */
2665 signal (signo
, sigchld_handler
); /* WARNING - must come after wait3() */
2668 sigheld
&= ~sigbit (SIGCHLD
);
2676 #endif /* no WNOHANG */
2678 /* Find the process that signaled us, and record its status. */
2681 for (tail
= Vprocess_alist
; XSYMBOL (tail
) != XSYMBOL (Qnil
); tail
= XCONS (tail
)->cdr
)
2683 proc
= XCONS (XCONS (tail
)->car
)->cdr
;
2684 p
= XPROCESS (proc
);
2685 if (EQ (p
->childp
, Qt
) && XFASTINT (p
->pid
) == pid
)
2690 /* Look for an asynchronous process whose pid hasn't been filled
2693 for (tail
= Vprocess_alist
; XSYMBOL (tail
) != XSYMBOL (Qnil
); tail
= XCONS (tail
)->cdr
)
2695 proc
= XCONS (XCONS (tail
)->car
)->cdr
;
2696 p
= XPROCESS (proc
);
2697 if (XTYPE (p
->pid
) == Lisp_Int
&& XINT (p
->pid
) == -1)
2702 /* Change the status of the process that was found. */
2705 union { int i
; WAITTYPE wt
; } u
;
2707 XSETINT (p
->tick
, ++process_tick
);
2709 XFASTINT (p
->raw_status_low
) = u
.i
& 0xffff;
2710 XFASTINT (p
->raw_status_high
) = u
.i
>> 16;
2712 /* If process has terminated, stop waiting for its output. */
2713 if (WIFSIGNALED (w
) || WIFEXITED (w
))
2714 if (XFASTINT (p
->infd
))
2715 FD_CLR (XFASTINT (p
->infd
), &input_wait_mask
);
2718 /* There was no asynchronous process found for that id. Check
2719 if we have a synchronous process. */
2722 synch_process_alive
= 0;
2724 /* Report the status of the synchronous process. */
2726 synch_process_retcode
= WRETCODE (w
);
2727 else if (WIFSIGNALED (w
))
2729 synch_process_death
= sys_siglist
[WTERMSIG (w
)];
2731 synch_process_death
= sys_errlist
[WTERMSIG (w
)];
2735 /* On some systems, we must return right away.
2736 If any more processes want to signal us, we will
2738 Otherwise (on systems that have WNOHANG), loop around
2739 to use up all the processes that have something to tell us. */
2740 #if defined (USG) && ! (defined (HPUX) && defined (WNOHANG))
2742 signal (signo
, sigchld_handler
);
2746 #endif /* USG, but not HPUX with WNOHANG */
2752 exec_sentinel_unwind (data
)
2755 XPROCESS (XCONS (data
)->car
)->sentinel
= XCONS (data
)->cdr
;
2760 exec_sentinel (proc
, reason
)
2761 Lisp_Object proc
, reason
;
2763 Lisp_Object sentinel
;
2764 register struct Lisp_Process
*p
= XPROCESS (proc
);
2765 int count
= specpdl_ptr
- specpdl
;
2767 sentinel
= p
->sentinel
;
2768 if (NILP (sentinel
))
2771 /* Zilch the sentinel while it's running, to avoid recursive invocations;
2772 assure that it gets restored no matter how the sentinel exits. */
2774 record_unwind_protect (exec_sentinel_unwind
, Fcons (proc
, sentinel
));
2775 /* Inhibit quit so that random quits don't screw up a running filter. */
2776 specbind (Qinhibit_quit
, Qt
);
2777 call2 (sentinel
, proc
, reason
);
2781 /* Report all recent events of a change in process status
2782 (either run the sentinel or output a message).
2783 This is done while Emacs is waiting for keyboard input. */
2787 register Lisp_Object proc
, buffer
;
2788 Lisp_Object tail
= Qnil
;
2789 Lisp_Object msg
= Qnil
;
2790 struct gcpro gcpro1
, gcpro2
;
2792 /* We need to gcpro tail; if read_process_output calls a filter
2793 which deletes a process and removes the cons to which tail points
2794 from Vprocess_alist, and then causes a GC, tail is an unprotected
2798 for (tail
= Vprocess_alist
; !NILP (tail
); tail
= Fcdr (tail
))
2801 register struct Lisp_Process
*p
;
2803 proc
= Fcdr (Fcar (tail
));
2804 p
= XPROCESS (proc
);
2806 if (XINT (p
->tick
) != XINT (p
->update_tick
))
2808 XSETINT (p
->update_tick
, XINT (p
->tick
));
2810 /* If process is still active, read any output that remains. */
2811 if (XFASTINT (p
->infd
))
2812 while (read_process_output (proc
, XFASTINT (p
->infd
)) > 0);
2816 /* Get the text to use for the message. */
2817 if (!NILP (p
->raw_status_low
))
2819 msg
= status_message (p
->status
);
2821 /* If process is terminated, deactivate it or delete it. */
2823 if (XTYPE (p
->status
) == Lisp_Cons
)
2824 symbol
= XCONS (p
->status
)->car
;
2826 if (EQ (symbol
, Qsignal
) || EQ (symbol
, Qexit
)
2827 || EQ (symbol
, Qclosed
))
2829 if (delete_exited_processes
)
2830 remove_process (proc
);
2832 deactivate_process (proc
);
2835 /* Now output the message suitably. */
2836 if (!NILP (p
->sentinel
))
2837 exec_sentinel (proc
, msg
);
2838 /* Don't bother with a message in the buffer
2839 when a process becomes runnable. */
2840 else if (!EQ (symbol
, Qrun
) && !NILP (buffer
))
2842 Lisp_Object ro
= XBUFFER (buffer
)->read_only
;
2844 struct buffer
*old
= current_buffer
;
2847 /* Avoid error if buffer is deleted
2848 (probably that's why the process is dead, too) */
2849 if (NILP (XBUFFER (buffer
)->name
))
2851 Fset_buffer (buffer
);
2853 /* Insert new output into buffer
2854 at the current end-of-output marker,
2855 thus preserving logical ordering of input and output. */
2856 if (XMARKER (p
->mark
)->buffer
)
2857 SET_PT (marker_position (p
->mark
));
2860 if (point
<= opoint
)
2861 opoint
+= XSTRING (msg
)->size
+ XSTRING (p
->name
)->size
+ 10;
2863 tem
= current_buffer
->read_only
;
2864 current_buffer
->read_only
= Qnil
;
2865 insert_string ("\nProcess ");
2866 Finsert (1, &p
->name
);
2867 insert_string (" ");
2869 current_buffer
->read_only
= tem
;
2870 Fset_marker (p
->mark
, make_number (point
), p
->buffer
);
2873 set_buffer_internal (old
);
2878 update_mode_lines
++; /* in case buffers use %s in mode-line-format */
2879 redisplay_preserve_echo_area ();
2881 update_tick
= process_tick
;
2892 if (! noninteractive
|| initialized
)
2894 signal (SIGCHLD
, sigchld_handler
);
2897 FD_ZERO (&input_wait_mask
);
2898 FD_SET (0, &input_wait_mask
);
2899 Vprocess_alist
= Qnil
;
2900 for (i
= 0; i
< MAXDESC
; i
++)
2902 chan_process
[i
] = Qnil
;
2903 proc_buffered_char
[i
] = -1;
2907 DEFUN ("process-connection", Fprocess_connection
, Sprocess_connection
, 0, 1, 0,
2908 "Return the connection type of `PROCESS'. This can be nil (pipe),\n\
2909 t or pty (pty) or stream (socket connection).")
2911 Lisp_Object process
;
2913 return XPROCESS (process
)->type
;
2919 stream_process
= intern ("stream");
2921 Qprocessp
= intern ("processp");
2922 staticpro (&Qprocessp
);
2923 Qrun
= intern ("run");
2925 Qstop
= intern ("stop");
2927 Qsignal
= intern ("signal");
2928 staticpro (&Qsignal
);
2930 /* Qexit is already staticpro'd by syms_of_eval; don't staticpro it
2933 Qexit = intern ("exit");
2934 staticpro (&Qexit); */
2936 Qopen
= intern ("open");
2938 Qclosed
= intern ("closed");
2939 staticpro (&Qclosed
);
2941 staticpro (&Vprocess_alist
);
2943 DEFVAR_BOOL ("delete-exited-processes", &delete_exited_processes
,
2944 "*Non-nil means delete processes immediately when they exit.\n\
2945 nil means don't delete them until `list-processes' is run.");
2947 delete_exited_processes
= 1;
2949 DEFVAR_LISP ("process-connection-type", &Vprocess_connection_type
,
2950 "Control type of device used to communicate with subprocesses.\n\
2951 Values are nil to use a pipe, and t or 'pty for a pty. Note that if\n\
2952 pty's are not available, this variable will be ignored. The value takes\n\
2953 effect when `start-process' is called.");
2954 Vprocess_connection_type
= Qt
;
2956 defsubr (&Sprocessp
);
2957 defsubr (&Sget_process
);
2958 defsubr (&Sget_buffer_process
);
2959 defsubr (&Sdelete_process
);
2960 defsubr (&Sprocess_status
);
2961 defsubr (&Sprocess_exit_status
);
2962 defsubr (&Sprocess_id
);
2963 defsubr (&Sprocess_name
);
2964 defsubr (&Sprocess_command
);
2965 defsubr (&Sset_process_buffer
);
2966 defsubr (&Sprocess_buffer
);
2967 defsubr (&Sprocess_mark
);
2968 defsubr (&Sset_process_filter
);
2969 defsubr (&Sprocess_filter
);
2970 defsubr (&Sset_process_sentinel
);
2971 defsubr (&Sprocess_sentinel
);
2972 defsubr (&Sprocess_kill_without_query
);
2973 defsubr (&Slist_processes
);
2974 defsubr (&Sprocess_list
);
2975 defsubr (&Sstart_process
);
2977 defsubr (&Sopen_network_stream
);
2978 #endif /* HAVE_SOCKETS */
2979 defsubr (&Saccept_process_output
);
2980 defsubr (&Sprocess_send_region
);
2981 defsubr (&Sprocess_send_string
);
2982 defsubr (&Sinterrupt_process
);
2983 defsubr (&Skill_process
);
2984 defsubr (&Squit_process
);
2985 defsubr (&Sstop_process
);
2986 defsubr (&Scontinue_process
);
2987 defsubr (&Sprocess_send_eof
);
2988 defsubr (&Ssignal_process
);
2989 defsubr (&Swaiting_for_user_input_p
);
2990 /* defsubr (&Sprocess_connection); */
2994 #else /* not subprocesses */
2996 #include <sys/types.h>
3000 #include "systime.h"
3001 #include "termopts.h"
3003 extern int frame_garbaged
;
3006 /* As described above, except assuming that there are no subprocesses:
3008 Wait for timeout to elapse and/or keyboard input to be available.
3011 timeout in seconds, or
3012 zero for no limit, or
3013 -1 means gobble data immediately available but don't wait for any.
3015 read_kbd is a Lisp_Object:
3016 0 to ignore keyboard input, or
3017 1 to return when input is available, or
3018 -1 means caller will actually read the input, so don't throw to
3020 We know that read_kbd will never be a Lisp_Process, since
3021 `subprocesses' isn't defined.
3023 do_display != 0 means redisplay should be done to show subprocess
3024 output that arrives. This version of the function ignores it.
3026 Return true iff we recieved input from any process. */
3029 wait_reading_process_input (time_limit
, microsecs
, read_kbd
, do_display
)
3030 int time_limit
, microsecs
;
3031 Lisp_Object read_kbd
;
3034 EMACS_TIME end_time
, timeout
, *timeout_p
;
3037 /* What does time_limit really mean? */
3038 if (time_limit
|| microsecs
)
3040 /* It's not infinite. */
3041 timeout_p
= &timeout
;
3043 if (time_limit
== -1)
3044 /* In fact, it's zero. */
3045 EMACS_SET_SECS_USECS (timeout
, 0, 0);
3047 EMACS_SET_SECS_USECS (timeout
, time_limit
, microsecs
);
3049 /* How far in the future is that? */
3050 EMACS_GET_TIME (end_time
);
3051 EMACS_ADD_TIME (end_time
, end_time
, timeout
);
3054 /* It's infinite. */
3057 /* Turn off periodic alarms (in case they are in use)
3058 because the select emulator uses alarms. */
3065 waitchannels
= XINT (read_kbd
) ? 1 : 0;
3067 /* If calling from keyboard input, do not quit
3068 since we want to return C-g as an input character.
3069 Otherwise, do pending quit if requested. */
3070 if (XINT (read_kbd
) >= 0)
3075 EMACS_GET_TIME (*timeout_p
);
3076 EMACS_SUB_TIME (*timeout_p
, end_time
, *timeout_p
);
3077 if (EMACS_TIME_NEG_P (*timeout_p
))
3081 /* Cause C-g and alarm signals to take immediate action,
3082 and cause input available signals to zero out timeout. */
3083 if (XINT (read_kbd
) < 0)
3084 set_waiting_for_input (&timeout
);
3086 /* If a frame has been newly mapped and needs updating,
3087 reprocess its display stuff. */
3089 redisplay_preserve_echo_area ();
3091 if (XINT (read_kbd
) && detect_input_pending ())
3094 nfds
= select (1, &waitchannels
, 0, 0, timeout_p
);
3096 /* Make C-g and alarm signals set flags again */
3097 clear_waiting_for_input ();
3099 /* If we woke up due to SIGWINCH, actually change size now. */
3100 do_pending_window_change ();
3104 /* If the system call was interrupted, then go around the
3110 else if (nfds
> 0 && (waitchannels
& 1) && interrupt_input
)
3111 /* System sometimes fails to deliver SIGIO. */
3112 kill (getpid (), SIGIO
);
3114 if (XINT (read_kbd
) && interrupt_input
&& (waitchannels
& 1))
3117 /* If we have timed out (nfds == 0) or found some input (nfds > 0),
3127 DEFUN ("get-buffer-process", Fget_buffer_process
, Sget_buffer_process
, 1, 1, 0,
3128 "Return the (or, a) process associated with BUFFER.\n\
3129 This copy of Emacs has not been built to support subprocesses, so this\n\
3130 function always returns nil.")
3132 register Lisp_Object name
;
3137 /* Kill all processes associated with `buffer'.
3138 If `buffer' is nil, kill all processes.
3139 Since we have no subprocesses, this does nothing. */
3141 kill_buffer_processes (buffer
)
3152 defsubr (&Sget_buffer_process
);
3156 #endif /* not subprocesses */