1 /* Asynchronous subprocess control for GNU Emacs.
2 Copyright (C) 1985, 1986, 1987, 1988, 1992 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 1, 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"
74 #include "dispextern.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
, 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
);
973 CHECK_STRING (name
, 0);
977 CHECK_STRING (program
, 2);
980 /* Make a one member argv with all args concatenated
981 together separated by a blank. */
982 len
= XSTRING (program
)->size
+ 2;
983 for (i
= 3; i
< nargs
; i
++)
986 CHECK_STRING (tem
, i
);
987 len
+= XSTRING (tem
)->size
+ 1; /* count the blank */
989 new_argv
= (unsigned char *) alloca (len
);
990 strcpy (new_argv
, XSTRING (program
)->data
);
991 for (i
= 3; i
< nargs
; i
++)
994 CHECK_STRING (tem
, i
);
995 strcat (new_argv
, " ");
996 strcat (new_argv
, XSTRING (tem
)->data
);
998 /* Need to add code here to check for program existence on VMS */
1001 new_argv
= (unsigned char **) alloca ((nargs
- 1) * sizeof (char *));
1003 for (i
= 3; i
< nargs
; i
++)
1006 CHECK_STRING (tem
, i
);
1007 new_argv
[i
- 2] = XSTRING (tem
)->data
;
1009 new_argv
[i
- 2] = 0;
1010 new_argv
[0] = XSTRING (program
)->data
;
1012 /* If program file name is not absolute, search our path for it */
1013 if (new_argv
[0][0] != '/')
1016 openp (Vexec_path
, program
, "", &tem
, 1);
1018 report_file_error ("Searching for program", Fcons (program
, Qnil
));
1019 new_argv
[0] = XSTRING (tem
)->data
;
1021 #endif /* not VMS */
1023 proc
= make_process (name
);
1024 /* If an error occurs and we can't start the process, we want to
1025 remove it from the process list. This means that each error
1026 check in create_process doesn't need to call remove_process
1027 itself; it's all taken care of here. */
1028 record_unwind_protect (start_process_unwind
, proc
);
1030 XPROCESS (proc
)->childp
= Qt
;
1031 XPROCESS (proc
)->command_channel_p
= Qnil
;
1032 XPROCESS (proc
)->buffer
= buffer
;
1033 XPROCESS (proc
)->sentinel
= Qnil
;
1034 XPROCESS (proc
)->filter
= Qnil
;
1035 XPROCESS (proc
)->command
= Flist (nargs
- 2, args
+ 2);
1037 create_process (proc
, new_argv
);
1039 return unbind_to (count
, proc
);
1042 /* This function is the unwind_protect form for Fstart_process. If
1043 PROC doesn't have its pid set, then we know someone has signalled
1044 an error and the process wasn't started successfully, so we should
1045 remove it from the process list. */
1047 start_process_unwind (proc
)
1050 if (XTYPE (proc
) != Lisp_Process
)
1053 /* Was PROC started successfully? */
1054 if (XPROCESS (proc
)->pid
<= 0)
1055 remove_process (proc
);
1062 create_process_1 (signo
)
1066 /* USG systems forget handlers when they are used;
1067 must reestablish each time */
1068 signal (signo
, create_process_1
);
1072 #if 0 /* This doesn't work; see the note before sigchld_handler. */
1075 /* Mimic blocking of signals on system V, which doesn't really have it. */
1077 /* Nonzero means we got a SIGCHLD when it was supposed to be blocked. */
1078 int sigchld_deferred
;
1081 create_process_sigchld ()
1083 signal (SIGCHLD
, create_process_sigchld
);
1085 sigchld_deferred
= 1;
1091 #ifndef VMS /* VMS version of this function is in vmsproc.c. */
1092 create_process (process
, new_argv
)
1093 Lisp_Object process
;
1096 int pid
, inchannel
, outchannel
, forkin
, forkout
;
1099 SIGTYPE (*sigchld
)();
1102 Lisp_Object current_dir
;
1103 extern char **environ
;
1105 inchannel
= outchannel
= -1;
1108 if (EQ (Vprocess_connection_type
, Qt
))
1109 outchannel
= inchannel
= allocate_pty ();
1111 /* Make sure that the child will be able to chdir to the current
1112 buffer's current directory. We can't just have the child check
1113 for an error when it does the chdir, since it's in a vfork. */
1114 current_dir
= expand_and_dir_to_file (current_buffer
->directory
, Qnil
);
1115 if (NILP (Ffile_accessible_directory_p (current_dir
)))
1116 report_file_error ("Setting current directory",
1117 Fcons (current_buffer
->directory
, Qnil
));
1122 /* On USG systems it does not work to open the pty's tty here
1123 and then close and reopen it in the child. */
1125 /* Don't let this terminal become our controlling terminal
1126 (in case we don't have one). */
1127 forkout
= forkin
= open (pty_name
, O_RDWR
| O_NOCTTY
, 0);
1129 forkout
= forkin
= open (pty_name
, O_RDWR
, 0);
1132 report_file_error ("Opening pty", Qnil
);
1134 forkin
= forkout
= -1;
1135 #endif /* not USG */
1139 #endif /* HAVE_PTYS */
1142 if (socketpair (AF_UNIX
, SOCK_STREAM
, 0, sv
) < 0)
1143 report_file_error ("Opening socketpair", Qnil
);
1144 outchannel
= inchannel
= sv
[0];
1145 forkout
= forkin
= sv
[1];
1147 #else /* not SKTPAIR */
1156 #endif /* not SKTPAIR */
1159 /* Replaced by close_process_descs */
1160 set_exclusive_use (inchannel
);
1161 set_exclusive_use (outchannel
);
1164 /* Stride people say it's a mystery why this is needed
1165 as well as the O_NDELAY, but that it fails without this. */
1166 #if defined (STRIDE) || (defined (pfa) && defined (HAVE_PTYS))
1169 ioctl (inchannel
, FIONBIO
, &one
);
1174 fcntl (inchannel
, F_SETFL
, O_NONBLOCK
);
1177 fcntl (inchannel
, F_SETFL
, O_NDELAY
);
1181 /* Record this as an active process, with its channels.
1182 As a result, child_setup will close Emacs's side of the pipes. */
1183 chan_process
[inchannel
] = process
;
1184 XFASTINT (XPROCESS (process
)->infd
) = inchannel
;
1185 XFASTINT (XPROCESS (process
)->outfd
) = outchannel
;
1186 /* Record the tty descriptor used in the subprocess. */
1188 XPROCESS (process
)->subtty
= Qnil
;
1190 XFASTINT (XPROCESS (process
)->subtty
) = forkin
;
1191 XPROCESS (process
)->pty_flag
= (pty_flag
? Qt
: Qnil
);
1192 XPROCESS (process
)->status
= Qrun
;
1194 /* Delay interrupts until we have a chance to store
1195 the new fork's pid in its process structure */
1199 #else /* not BSD4_1 */
1200 #if defined (BSD) || defined (UNIPLUS) || defined (HPUX)
1201 sigsetmask (sigmask (SIGCHLD
));
1202 #else /* ordinary USG */
1204 sigchld_deferred
= 0;
1205 sigchld
= signal (SIGCHLD
, create_process_sigchld
);
1207 #endif /* ordinary USG */
1208 #endif /* not BSD4_1 */
1209 #endif /* SIGCHLD */
1211 /* Until we store the proper pid, enable sigchld_handler
1212 to recognize an unknown pid as standing for this process.
1213 It is very important not to let this `marker' value stay
1214 in the table after this function has returned; if it does
1215 it might cause call-process to hang and subsequent asynchronous
1216 processes to get their return values scrambled. */
1217 XSETINT (XPROCESS (process
)->pid
, -1);
1220 /* child_setup must clobber environ on systems with true vfork.
1221 Protect it from permanent change. */
1222 char **save_environ
= environ
;
1227 int xforkin
= forkin
;
1228 int xforkout
= forkout
;
1230 #if 0 /* This was probably a mistake--it duplicates code later on,
1231 but fails to handle all the cases. */
1232 /* Make sure SIGCHLD is not blocked in the child. */
1233 sigsetmask (SIGEMPTYMASK
);
1236 /* Make the pty be the controlling terminal of the process. */
1238 /* First, disconnect its current controlling terminal. */
1242 /* Make the pty's terminal the controlling terminal. */
1243 if (pty_flag
&& (ioctl (xforkin
, TIOCSCTTY
, 0) < 0))
1246 #else /* not HAVE_SETSID */
1248 /* It's very important to call setpgrp() here and no time
1249 afterwards. Otherwise, we lose our controlling tty which
1250 is set when we open the pty. */
1253 #endif /* not HAVE_SETSID */
1255 /* In 4.3BSD, the TIOCSPGRP bug has been fixed, and now you
1256 can do TIOCSPGRP only to the process's controlling tty. */
1259 /* I wonder: would just ioctl (0, TIOCNOTTY, 0) work here?
1260 I can't test it since I don't have 4.3. */
1261 int j
= open ("/dev/tty", O_RDWR
, 0);
1262 ioctl (j
, TIOCNOTTY
, 0);
1265 /* In order to get a controlling terminal on some versions
1266 of BSD, it is necessary to put the process in pgrp 0
1267 before it opens the terminal. */
1271 #endif /* TIOCNOTTY */
1273 #if !defined (RTU) && !defined (UNIPLUS)
1274 /*** There is a suggestion that this ought to be a
1275 conditional on TIOCSPGRP. */
1276 /* Now close the pty (if we had it open) and reopen it.
1277 This makes the pty the controlling terminal of the subprocess. */
1280 /* I wonder if close (open (pty_name, ...)) would work? */
1283 xforkout
= xforkin
= open (pty_name
, O_RDWR
, 0);
1288 #endif /* not UNIPLUS and not RTU */
1289 #ifdef SETUP_SLAVE_PTY
1291 #endif /* SETUP_SLAVE_PTY */
1293 /* On AIX, we've disabled SIGHUP above once we start a child on a pty.
1294 Now reenable it in the child, so it will die when we want it to. */
1296 signal (SIGHUP
, SIG_DFL
);
1298 #endif /* HAVE_PTYS */
1303 #else /* not BSD4_1 */
1304 #if defined (BSD) || defined (UNIPLUS) || defined (HPUX)
1305 sigsetmask (SIGEMPTYMASK
);
1306 #else /* ordinary USG */
1308 signal (SIGCHLD
, sigchld
);
1310 #endif /* ordinary USG */
1311 #endif /* not BSD4_1 */
1312 #endif /* SIGCHLD */
1314 child_setup_tty (xforkout
);
1315 child_setup (xforkin
, xforkout
, xforkout
,
1316 new_argv
, 1, current_dir
);
1318 environ
= save_environ
;
1322 report_file_error ("Doing vfork", Qnil
);
1324 XFASTINT (XPROCESS (process
)->pid
) = pid
;
1326 FD_SET (inchannel
, &input_wait_mask
);
1328 /* If the subfork execv fails, and it exits,
1329 this close hangs. I don't know why.
1330 So have an interrupt jar it loose. */
1332 signal (SIGALRM
, create_process_1
);
1335 /* OK to close only if it's not a pty. Otherwise we need to leave
1336 it open for ioctl to get pgrp when signals are sent, or to send
1337 the interrupt characters through if that's how we're signalling
1338 subprocesses. Alternately if you are concerned about running out
1339 of file descriptors, you could just save the tty name and open
1340 just to do the ioctl. */
1341 if (NILP (XFASTINT (XPROCESS (process
)->pty_flag
)))
1344 XPROCESS (process
)->subtty
= Qnil
;
1350 if (forkin
!= forkout
&& forkout
>= 0)
1356 #else /* not BSD4_1 */
1357 #if defined (BSD) || defined (UNIPLUS) || defined (HPUX)
1358 sigsetmask (SIGEMPTYMASK
);
1359 #else /* ordinary USG */
1361 signal (SIGCHLD
, sigchld
);
1362 /* Now really handle any of these signals
1363 that came in during this function. */
1364 if (sigchld_deferred
)
1365 kill (getpid (), SIGCHLD
);
1367 #endif /* ordinary USG */
1368 #endif /* not BSD4_1 */
1369 #endif /* SIGCHLD */
1371 #endif /* not VMS */
1375 /* open a TCP network connection to a given HOST/SERVICE. Treated
1376 exactly like a normal process when reading and writing. Only
1377 differences are in status display and process deletion. A network
1378 connection has no PID; you cannot signal it. All you can do is
1379 deactivate and close it via delete-process */
1381 DEFUN ("open-network-stream", Fopen_network_stream
, Sopen_network_stream
,
1383 "Open a TCP connection for a service to a host.\n\
1384 Returns a subprocess-object to represent the connection.\n\
1385 Input and output work as for subprocesses; `delete-process' closes it.\n\
1386 Args are NAME BUFFER HOST SERVICE.\n\
1387 NAME is name for process. It is modified if necessary to make it unique.\n\
1388 BUFFER is the buffer (or buffer-name) to associate with the process.\n\
1389 Process output goes at end of that buffer, unless you specify\n\
1390 an output stream or filter function to handle the output.\n\
1391 BUFFER may be also nil, meaning that this process is not associated\n\
1393 Third arg is name of the host to connect to, or its IP address.\n\
1394 Fourth arg SERVICE is name of the service desired, or an integer\n\
1395 specifying a port number to connect to.")
1396 (name
, buffer
, host
, service
)
1397 Lisp_Object name
, buffer
, host
, service
;
1401 struct sockaddr_in address
;
1402 struct servent
*svc_info
;
1403 struct hostent
*host_info_ptr
, host_info
;
1404 char *(addr_list
[2]);
1405 unsigned long numeric_addr
;
1409 struct hostent host_info_fixed
;
1410 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
;
1412 GCPRO4 (name
, buffer
, host
, service
);
1413 CHECK_STRING (name
, 0);
1414 CHECK_STRING (host
, 0);
1415 if (XTYPE(service
) == Lisp_Int
)
1416 port
= htons ((unsigned short) XINT (service
));
1419 CHECK_STRING (service
, 0);
1420 svc_info
= getservbyname (XSTRING (service
)->data
, "tcp");
1422 error ("Unknown service \"%s\"", XSTRING (service
)->data
);
1423 port
= svc_info
->s_port
;
1426 host_info_ptr
= gethostbyname (XSTRING (host
)->data
);
1427 if (host_info_ptr
== 0)
1428 /* Attempt to interpret host as numeric inet address */
1430 numeric_addr
= inet_addr (XSTRING (host
)->data
);
1431 if (numeric_addr
== -1)
1432 error ("Unknown host \"%s\"", XSTRING (host
)->data
);
1434 host_info_ptr
= &host_info
;
1435 host_info
.h_name
= 0;
1436 host_info
.h_aliases
= 0;
1437 host_info
.h_addrtype
= AF_INET
;
1438 host_info
.h_addr_list
= &(addr_list
[0]);
1439 addr_list
[0] = (char*)(&numeric_addr
);
1441 host_info
.h_length
= strlen (addr_list
[0]);
1444 bzero (&address
, sizeof address
);
1445 bcopy (host_info_ptr
->h_addr
, (char *) &address
.sin_addr
,
1446 host_info_ptr
->h_length
);
1447 address
.sin_family
= host_info_ptr
->h_addrtype
;
1448 address
.sin_port
= port
;
1450 s
= socket (host_info_ptr
->h_addrtype
, SOCK_STREAM
, 0);
1452 report_file_error ("error creating socket", Fcons (name
, Qnil
));
1455 if (connect (s
, &address
, sizeof address
) == -1)
1462 report_file_error ("connection failed",
1463 Fcons (host
, Fcons (name
, Qnil
)));
1469 report_file_error ("error duplicating socket", Fcons (name
, Qnil
));
1472 buffer
= Fget_buffer_create (buffer
);
1473 proc
= make_process (name
);
1475 chan_process
[inch
] = proc
;
1478 fcntl (inch
, F_SETFL
, O_NONBLOCK
);
1481 fcntl (inch
, F_SETFL
, O_NDELAY
);
1485 XPROCESS (proc
)->childp
= host
;
1486 XPROCESS (proc
)->command_channel_p
= Qnil
;
1487 XPROCESS (proc
)->buffer
= buffer
;
1488 XPROCESS (proc
)->sentinel
= Qnil
;
1489 XPROCESS (proc
)->filter
= Qnil
;
1490 XPROCESS (proc
)->command
= Qnil
;
1491 XPROCESS (proc
)->pid
= Qnil
;
1492 XFASTINT (XPROCESS (proc
)->infd
) = s
;
1493 XFASTINT (XPROCESS (proc
)->outfd
) = outch
;
1494 XPROCESS (proc
)->status
= Qrun
;
1495 FD_SET (inch
, &input_wait_mask
);
1500 #endif /* HAVE_SOCKETS */
1502 deactivate_process (proc
)
1505 register int inchannel
, outchannel
;
1506 register struct Lisp_Process
*p
= XPROCESS (proc
);
1508 inchannel
= XFASTINT (p
->infd
);
1509 outchannel
= XFASTINT (p
->outfd
);
1513 /* Beware SIGCHLD hereabouts. */
1514 flush_pending_output (inchannel
);
1517 VMS_PROC_STUFF
*get_vms_process_pointer (), *vs
;
1518 sys$
dassgn (outchannel
);
1519 vs
= get_vms_process_pointer (p
->pid
)
1521 give_back_vms_process_stuff (vs
);
1525 if (outchannel
&& outchannel
!= inchannel
)
1529 XFASTINT (p
->infd
) = 0;
1530 XFASTINT (p
->outfd
) = 0;
1531 chan_process
[inchannel
] = Qnil
;
1532 FD_CLR (inchannel
, &input_wait_mask
);
1536 /* Close all descriptors currently in use for communication
1537 with subprocess. This is used in a newly-forked subprocess
1538 to get rid of irrelevant descriptors. */
1540 close_process_descs ()
1543 for (i
= 0; i
< MAXDESC
; i
++)
1545 Lisp_Object process
;
1546 process
= chan_process
[i
];
1547 if (!NILP (process
))
1549 int in
= XFASTINT (XPROCESS (process
)->infd
);
1550 int out
= XFASTINT (XPROCESS (process
)->outfd
);
1553 if (out
&& in
!= out
)
1559 DEFUN ("accept-process-output", Faccept_process_output
, Saccept_process_output
,
1561 "Allow any pending output from subprocesses to be read by Emacs.\n\
1562 It is read into the process' buffers or given to their filter functions.\n\
1563 Non-nil arg PROCESS means do not return until some output has been received\n\
1565 Non-nil second arg TIMEOUT and third arg TIMEOUT-MSECS are number of\n\
1566 seconds and microseconds to wait; return after that much time whether\n\
1567 or not there is input.\n\
1568 Return non-nil iff we received any output before the timeout expired.")
1569 (proc
, timeout
, timeout_msecs
)
1570 register Lisp_Object proc
, timeout
, timeout_msecs
;
1575 if (! NILP (timeout_msecs
))
1577 CHECK_NUMBER (timeout_msecs
, 2);
1578 useconds
= XINT (timeout_msecs
);
1579 if (XTYPE (timeout
) != Lisp_Int
)
1580 XSET (timeout
, Lisp_Int
, 0);
1583 int carry
= useconds
/ 1000000;
1585 XSETINT (timeout
, XINT (timeout
) + carry
);
1586 useconds
-= carry
* 1000000;
1588 /* I think this clause is necessary because C doesn't
1589 guarantee a particular rounding direction for negative
1593 XSETINT (timeout
, XINT (timeout
) - 1);
1594 useconds
+= 1000000;
1601 if (! NILP (timeout
))
1603 CHECK_NUMBER (timeout
, 1);
1604 seconds
= XINT (timeout
);
1617 XFASTINT (proc
) = 0;
1620 (wait_reading_process_input (seconds
, useconds
, proc
, 0)
1624 /* This variable is different from waiting_for_input in keyboard.c.
1625 It is used to communicate to a lisp process-filter/sentinel (via the
1626 function Fwaiting_for_user_input_p below) whether emacs was waiting
1627 for user-input when that process-filter was called.
1628 waiting_for_input cannot be used as that is by definition 0 when
1629 lisp code is being evalled */
1630 static int waiting_for_user_input_p
;
1632 /* Read and dispose of subprocess output while waiting for timeout to
1633 elapse and/or keyboard input to be available.
1636 timeout in seconds, or
1637 zero for no limit, or
1638 -1 means gobble data immediately available but don't wait for any.
1640 read_kbd is a lisp value:
1641 0 to ignore keyboard input, or
1642 1 to return when input is available, or
1643 -1 means caller will actually read the input, so don't throw to
1644 the quit handler, or
1645 a process object, meaning wait until something arrives from that
1646 process. The return value is true iff we read some input from
1649 do_display != 0 means redisplay should be done to show subprocess
1650 output that arrives.
1652 If read_kbd is a pointer to a struct Lisp_Process, then the
1653 function returns true iff we received input from that process
1654 before the timeout elapsed.
1655 Otherwise, return true iff we recieved input from any process. */
1657 wait_reading_process_input (time_limit
, microsecs
, read_kbd
, do_display
)
1658 int time_limit
, microsecs
;
1659 Lisp_Object read_kbd
;
1662 register int channel
, nfds
, m
;
1663 static SELECT_TYPE Available
;
1666 EMACS_TIME timeout
, end_time
, garbage
;
1668 int wait_channel
= 0;
1669 struct Lisp_Process
*wait_proc
= 0;
1670 int got_some_input
= 0;
1672 FD_ZERO (&Available
);
1674 /* If read_kbd is a process to watch, set wait_proc and wait_channel
1676 if (XTYPE (read_kbd
) == Lisp_Process
)
1678 wait_proc
= XPROCESS (read_kbd
);
1679 wait_channel
= XFASTINT (wait_proc
->infd
);
1680 XFASTINT (read_kbd
) = 0;
1683 waiting_for_user_input_p
= XINT (read_kbd
);
1685 /* Since we may need to wait several times,
1686 compute the absolute time to return at. */
1687 if (time_limit
|| microsecs
)
1689 EMACS_GET_TIME (end_time
);
1690 EMACS_SET_SECS_USECS (timeout
, time_limit
, microsecs
);
1691 EMACS_ADD_TIME (end_time
, end_time
, timeout
);
1696 /* If calling from keyboard input, do not quit
1697 since we want to return C-g as an input character.
1698 Otherwise, do pending quit if requested. */
1699 if (XINT (read_kbd
) >= 0)
1702 /* If status of something has changed, and no input is available,
1703 notify the user of the change right away */
1704 if (update_tick
!= process_tick
&& do_display
)
1706 Atemp
= input_wait_mask
;
1707 EMACS_SET_SECS_USECS (timeout
, 0, 0);
1708 if (select (MAXDESC
, &Atemp
, 0, 0, &timeout
) <= 0)
1712 /* Don't wait for output from a non-running process. */
1713 if (wait_proc
!= 0 && !NILP (wait_proc
->raw_status_low
))
1714 update_status (wait_proc
);
1716 && ! EQ (wait_proc
->status
, Qrun
))
1719 /* Compute time from now till when time limit is up */
1720 /* Exit if already run out */
1721 if (time_limit
== -1)
1723 /* -1 specified for timeout means
1724 gobble output available now
1725 but don't wait at all. */
1727 EMACS_SET_SECS_USECS (timeout
, 0, 0);
1729 else if (time_limit
|| microsecs
)
1731 EMACS_GET_TIME (timeout
);
1732 EMACS_SUB_TIME (timeout
, end_time
, timeout
);
1733 if (EMACS_TIME_NEG_P (timeout
))
1738 EMACS_SET_SECS_USECS (timeout
, 100000, 0);
1741 /* Cause C-g and alarm signals to take immediate action,
1742 and cause input available signals to zero out timeout */
1743 if (XINT (read_kbd
) < 0)
1744 set_waiting_for_input (&timeout
);
1746 /* Wait till there is something to do */
1748 Available
= input_wait_mask
;
1749 if (! XINT (read_kbd
))
1750 FD_CLR (0, &Available
);
1752 /* If frame size has changed or the window is newly mapped,
1753 redisplay now, before we start to wait. There is a race
1754 condition here; if a SIGIO arrives between now and the select
1755 and indicates that a frame is trashed, the select may block
1756 displaying a trashed screen. */
1758 redisplay_preserve_echo_area ();
1760 if (XINT (read_kbd
) && detect_input_pending ())
1763 nfds
= select (MAXDESC
, &Available
, 0, 0, &timeout
);
1767 /* Make C-g and alarm signals set flags again */
1768 clear_waiting_for_input ();
1770 /* If we woke up due to SIGWINCH, actually change size now. */
1771 do_pending_window_change ();
1773 if (time_limit
&& nfds
== 0) /* timeout elapsed */
1777 if (xerrno
== EINTR
)
1778 FD_ZERO (&Available
);
1780 /* Ultrix select seems to return ENOMEM when it is
1781 interrupted. Treat it just like EINTR. Bleah. Note
1782 that we want to test for the "ultrix" CPP symbol, not
1783 "__ultrix__"; the latter is only defined under GCC, but
1784 not by DEC's bundled CC. -JimB */
1785 else if (xerrno
== ENOMEM
)
1786 FD_ZERO (&Available
);
1789 /* This happens for no known reason on ALLIANT.
1790 I am guessing that this is the right response. -- RMS. */
1791 else if (xerrno
== EFAULT
)
1792 FD_ZERO (&Available
);
1794 else if (xerrno
== EBADF
)
1797 /* AIX doesn't handle PTY closure the same way BSD does. On AIX,
1798 the child's closure of the pts gives the parent a SIGHUP, and
1799 the ptc file descriptor is automatically closed,
1800 yielding EBADF here or at select() call above.
1801 So, SIGHUP is ignored (see def of PTY_TTY_NAME_SPRINTF
1802 in m-ibmrt-aix.h), and here we just ignore the select error.
1803 Cleanup occurs c/o status_notify after SIGCLD. */
1804 FD_ZERO (&Available
); /* Cannot depend on values returned */
1810 error("select error: %s", sys_errlist
[xerrno
]);
1813 else if (nfds
> 0 && FD_ISSET (0, &Available
) && interrupt_input
)
1814 /* System sometimes fails to deliver SIGIO. */
1815 kill (getpid (), SIGIO
);
1818 /* Check for keyboard input */
1819 /* If there is any, return immediately
1820 to give it higher priority than subprocesses */
1822 if (XINT (read_kbd
) && detect_input_pending ())
1826 /* If we think we have keyboard input waiting, but didn't get SIGIO
1827 go read it. This can happen with X on BSD after logging out.
1828 In that case, there really is no input and no SIGIO,
1829 but select says there is input. */
1832 if (XINT (read_kbd) && interrupt_input && (Available & fileno (stdin)))
1834 if (XINT (read_kbd
) && interrupt_input
&& (FD_ISSET (fileno (stdin
), &Available
)))
1839 /* Check for connection from other process */
1841 if (Available
& ChannelMask (comm_server
))
1843 Available
&= ~(ChannelMask (comm_server
));
1849 got_some_input
|= nfds
> 0;
1851 /* If checking input just got us a size-change event from X,
1852 obey it now if we should. */
1853 if (XINT (read_kbd
))
1854 do_pending_window_change ();
1856 /* Check for data from a process or a command channel */
1857 for (channel
= FIRST_PROC_DESC
; channel
< MAXDESC
; channel
++)
1859 if (FD_ISSET (channel
, &Available
))
1863 /* If waiting for this channel, arrange to return as
1864 soon as no more input to be processed. No more
1866 if (wait_channel
== channel
)
1872 proc
= chan_process
[channel
];
1877 /* It's a command channel */
1878 if (!NILP (XPROCESS (proc
)->command_channel_p
))
1880 ProcessCommChan (channel
, proc
);
1881 if (NILP (XPROCESS (proc
)->command_channel_p
))
1883 /* It has ceased to be a command channel! */
1884 int bytes_available
;
1885 if (ioctl (channel
, FIONREAD
, &bytes_available
) < 0)
1886 bytes_available
= 0;
1887 if (bytes_available
)
1888 FD_SET (channel
, &Available
);
1894 /* Read data from the process, starting with our
1895 buffered-ahead character if we have one. */
1897 nread
= read_process_output (proc
, channel
);
1900 /* Since read_process_output can run a filter,
1901 which can call accept-process-output,
1902 don't try to read from any other processes
1903 before doing the select again. */
1904 FD_ZERO (&Available
);
1907 redisplay_preserve_echo_area ();
1910 else if (nread
== -1 && errno
== EWOULDBLOCK
)
1914 else if (nread
== -1 && errno
== EAGAIN
)
1918 else if (nread
== -1 && errno
== EAGAIN
)
1920 /* Note that we cannot distinguish between no input
1921 available now and a closed pipe.
1922 With luck, a closed pipe will be accompanied by
1923 subprocess termination and SIGCHLD. */
1924 else if (nread
== 0 && !NETCONN_P (proc
))
1926 #endif /* O_NDELAY */
1927 #endif /* O_NONBLOCK */
1928 #endif /* EWOULDBLOCK */
1930 /* On some OSs with ptys, when the process on one end of
1931 a pty exits, the other end gets an error reading with
1932 errno = EIO instead of getting an EOF (0 bytes read).
1933 Therefore, if we get an error reading and errno =
1934 EIO, just continue, because the child process has
1935 exited and should clean itself up soon (e.g. when we
1937 else if (nread
== -1 && errno
== EIO
)
1939 #endif /* HAVE_PTYS */
1940 /* If we can detect process termination, don't consider the process
1941 gone just because its pipe is closed. */
1943 else if (nread
== 0 && !NETCONN_P (proc
))
1948 /* Preserve status of processes already terminated. */
1949 XSETINT (XPROCESS (proc
)->tick
, ++process_tick
);
1950 deactivate_process (proc
);
1951 if (!NILP (XPROCESS (proc
)->raw_status_low
))
1952 update_status (XPROCESS (proc
));
1953 if (EQ (XPROCESS (proc
)->status
, Qrun
))
1954 XPROCESS (proc
)->status
1955 = Fcons (Qexit
, Fcons (make_number (256), Qnil
));
1958 } /* end for each file descriptor */
1959 } /* end while exit conditions not met */
1961 /* If calling from keyboard input, do not quit
1962 since we want to return C-g as an input character.
1963 Otherwise, do pending quit if requested. */
1964 if (XINT (read_kbd
) >= 0)
1966 /* Prevent input_pending from remaining set if we quit. */
1967 clear_input_pending ();
1971 return got_some_input
;
1974 /* Read pending output from the process channel,
1975 starting with our buffered-ahead character if we have one.
1976 Yield number of characters read.
1978 This function reads at most 1024 characters.
1979 If you want to read all available subprocess output,
1980 you must call it repeatedly until it returns zero. */
1982 read_process_output (proc
, channel
)
1984 register int channel
;
1986 register int nchars
;
1992 register Lisp_Object outstream
;
1993 register struct buffer
*old
= current_buffer
;
1994 register struct Lisp_Process
*p
= XPROCESS (proc
);
1995 register int opoint
;
1998 VMS_PROC_STUFF
*vs
, *get_vms_process_pointer();
2000 vs
= get_vms_process_pointer (p
->pid
);
2004 return(0); /* Really weird if it does this */
2005 if (!(vs
->iosb
[0] & 1))
2006 return -1; /* I/O error */
2009 error ("Could not get VMS process pointer");
2010 chars
= vs
->inputBuffer
;
2011 nchars
= clean_vms_buffer (chars
, vs
->iosb
[1]);
2014 start_vms_process_read (vs
); /* Crank up the next read on the process */
2015 return 1; /* Nothing worth printing, say we got 1 */
2019 if (proc_buffered_char
[channel
] < 0)
2020 nchars
= read (channel
, chars
, sizeof chars
);
2023 chars
[0] = proc_buffered_char
[channel
];
2024 proc_buffered_char
[channel
] = -1;
2025 nchars
= read (channel
, chars
+ 1, sizeof chars
- 1);
2029 nchars
= nchars
+ 1;
2031 #endif /* not VMS */
2033 if (nchars
<= 0) return nchars
;
2035 outstream
= p
->filter
;
2036 if (!NILP (outstream
))
2038 /* We inhibit quit here instead of just catching it so that
2039 hitting ^G when a filter happens to be running won't screw
2041 int count
= specpdl_ptr
- specpdl
;
2042 specbind (Qinhibit_quit
, Qt
);
2043 call2 (outstream
, proc
, make_string (chars
, nchars
));
2046 start_vms_process_read (vs
);
2052 /* If no filter, write into buffer if it isn't dead. */
2053 if (!NILP (p
->buffer
) && !NILP (XBUFFER (p
->buffer
)->name
))
2055 Lisp_Object old_read_only
;
2056 Lisp_Object old_begv
, old_zv
;
2058 Fset_buffer (p
->buffer
);
2060 old_read_only
= current_buffer
->read_only
;
2061 XFASTINT (old_begv
) = BEGV
;
2062 XFASTINT (old_zv
) = ZV
;
2064 current_buffer
->read_only
= Qnil
;
2066 /* Insert new output into buffer
2067 at the current end-of-output marker,
2068 thus preserving logical ordering of input and output. */
2069 if (XMARKER (p
->mark
)->buffer
)
2070 SET_PT (marker_position (p
->mark
));
2074 /* If the output marker is outside of the visible region, save
2075 the restriction and widen. */
2076 if (! (BEGV
<= point
&& point
<= ZV
))
2079 /* Make sure opoint floats ahead of any new text, just as point
2081 if (point
<= opoint
)
2084 /* Insert after old_begv, but before old_zv. */
2085 if (point
< XFASTINT (old_begv
))
2086 XFASTINT (old_begv
) += nchars
;
2087 if (point
<= XFASTINT (old_zv
))
2088 XFASTINT (old_zv
) += nchars
;
2090 /* Insert before markers in case we are inserting where
2091 the buffer's mark is, and the user's next command is Meta-y. */
2092 insert_before_markers (chars
, nchars
);
2093 Fset_marker (p
->mark
, make_number (point
), p
->buffer
);
2095 update_mode_lines
++;
2097 /* If the restriction isn't what it should be, set it. */
2098 if (XFASTINT (old_begv
) != BEGV
|| XFASTINT (old_zv
) != ZV
)
2099 Fnarrow_to_region (old_begv
, old_zv
);
2101 current_buffer
->read_only
= old_read_only
;
2103 set_buffer_internal (old
);
2106 start_vms_process_read (vs
);
2111 DEFUN ("waiting-for-user-input-p", Fwaiting_for_user_input_p
, Swaiting_for_user_input_p
,
2113 "Returns non-NIL if emacs is waiting for input from the user.\n\
2114 This is intended for use by asynchronous process output filters and sentinels.")
2117 return ((waiting_for_user_input_p
) ? Qt
: Qnil
);
2120 /* Sending data to subprocess */
2122 jmp_buf send_process_frame
;
2125 send_process_trap ()
2131 longjmp (send_process_frame
, 1);
2134 send_process (proc
, buf
, len
)
2139 /* Don't use register vars; longjmp can lose them. */
2141 unsigned char *procname
= XSTRING (XPROCESS (proc
)->name
)->data
;
2145 struct Lisp_Process
*p
= XPROCESS (proc
);
2146 VMS_PROC_STUFF
*vs
, *get_vms_process_pointer();
2149 if (! NILP (XPROCESS (proc
)->raw_status_low
))
2150 update_status (XPROCESS (proc
));
2151 if (! EQ (XPROCESS (proc
)->status
, Qrun
))
2152 error ("Process %s not running", procname
);
2155 vs
= get_vms_process_pointer (p
->pid
);
2157 error ("Could not find this process: %x", p
->pid
);
2158 else if (write_to_vms_process (vs
, buf
, len
))
2161 if (!setjmp (send_process_frame
))
2165 SIGTYPE (*old_sigpipe
)();
2167 /* Don't send more than 500 bytes at a time. */
2170 old_sigpipe
= (SIGTYPE (*) ()) signal (SIGPIPE
, send_process_trap
);
2171 rv
= write (XFASTINT (XPROCESS (proc
)->outfd
), buf
, this);
2172 signal (SIGPIPE
, old_sigpipe
);
2177 || errno
== EWOULDBLOCK
2184 /* It would be nice to accept process output here,
2185 but that is difficult. For example, it could
2186 garbage what we are sending if that is from a buffer. */
2193 report_file_error ("writing to process", Fcons (proc
, Qnil
));
2197 /* Allow input from processes between bursts of sending.
2198 Otherwise things may get stopped up. */
2203 XFASTINT (zero
) = 0;
2204 wait_reading_process_input (-1, 0, zero
, 0);
2210 XPROCESS (proc
)->raw_status_low
= Qnil
;
2211 XPROCESS (proc
)->raw_status_high
= Qnil
;
2212 XPROCESS (proc
)->status
= Fcons (Qexit
, Fcons (make_number (256), Qnil
));
2213 XSETINT (XPROCESS (proc
)->tick
, ++process_tick
);
2214 deactivate_process (proc
);
2216 error ("Error writing to process %s; closed it", procname
);
2218 error ("SIGPIPE raised on process %s; closed it", procname
);
2223 DEFUN ("process-send-region", Fprocess_send_region
, Sprocess_send_region
,
2225 "Send current contents of region as input to PROCESS.\n\
2226 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
2227 nil, indicating the current buffer's process.\n\
2228 Called from program, takes three arguments, PROCESS, START and END.\n\
2229 If the region is more than 500 characters long,\n\
2230 it is sent in several bunches. This may happen even for shorter regions.\n\
2231 Output from processes can arrive in between bunches.")
2232 (process
, start
, end
)
2233 Lisp_Object process
, start
, end
;
2238 proc
= get_process (process
);
2239 validate_region (&start
, &end
);
2241 if (XINT (start
) < GPT
&& XINT (end
) > GPT
)
2244 start1
= XINT (start
);
2245 send_process (proc
, &FETCH_CHAR (start1
), XINT (end
) - XINT (start
));
2250 DEFUN ("process-send-string", Fprocess_send_string
, Sprocess_send_string
,
2252 "Send PROCESS the contents of STRING as input.\n\
2253 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
2254 nil, indicating the current buffer's process.\n\
2255 If STRING is more than 500 characters long,\n\
2256 it is sent in several bunches. This may happen even for shorter strings.\n\
2257 Output from processes can arrive in between bunches.")
2259 Lisp_Object process
, string
;
2262 CHECK_STRING (string
, 1);
2263 proc
= get_process (process
);
2264 send_process (proc
, XSTRING (string
)->data
, XSTRING (string
)->size
);
2268 /* send a signal number SIGNO to PROCESS.
2269 CURRENT_GROUP means send to the process group that currently owns
2270 the terminal being used to communicate with PROCESS.
2271 This is used for various commands in shell mode.
2272 If NOMSG is zero, insert signal-announcements into process's buffers
2275 If we can, we try to signal PROCESS by sending control characters
2276 down the pipe. This allows us to signal inferiors who have changed
2277 their uid, for which killpg would return an EPERM error. */
2280 process_send_signal (process
, signo
, current_group
, nomsg
)
2281 Lisp_Object process
;
2283 Lisp_Object current_group
;
2287 register struct Lisp_Process
*p
;
2291 proc
= get_process (process
);
2292 p
= XPROCESS (proc
);
2294 if (!EQ (p
->childp
, Qt
))
2295 error ("Process %s is not a subprocess",
2296 XSTRING (p
->name
)->data
);
2297 if (!XFASTINT (p
->infd
))
2298 error ("Process %s is not active",
2299 XSTRING (p
->name
)->data
);
2301 if (NILP (p
->pty_flag
))
2302 current_group
= Qnil
;
2304 /* If we are using pgrps, get a pgrp number and make it negative. */
2305 if (!NILP (current_group
))
2307 #ifdef SIGNALS_VIA_CHARACTERS
2308 /* If possible, send signals to the entire pgrp
2309 by sending an input character to it. */
2311 /* On Berkeley descendants, the following IOCTL's retrieve the
2312 current control characters. */
2313 #if defined (TIOCGLTC) && defined (TIOCGETC)
2321 ioctl (XFASTINT (p
->infd
), TIOCGETC
, &c
);
2322 send_process (proc
, &c
.t_intrc
, 1);
2325 ioctl (XFASTINT (p
->infd
), TIOCGETC
, &c
);
2326 send_process (proc
, &c
.t_quitc
, 1);
2330 ioctl (XFASTINT (p
->infd
), TIOCGLTC
, &lc
);
2331 send_process (proc
, &lc
.t_suspc
, 1);
2333 #endif /* ! defined (SIGTSTP) */
2336 #else /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
2338 /* On SYSV descendants, the TCGETA ioctl retrieves the current control
2345 ioctl (XFASTINT (p
->infd
), TCGETA
, &t
);
2346 send_process (proc
, &t
.c_cc
[VINTR
], 1);
2349 ioctl (XFASTINT (p
->infd
), TCGETA
, &t
);
2350 send_process (proc
, &t
.c_cc
[VQUIT
], 1);
2354 ioctl (XFASTINT (p
->infd
), TCGETA
, &t
);
2355 send_process (proc
, &t
.c_cc
[VSWTCH
], 1);
2357 #endif /* ! defined (SIGTSTP) */
2359 #else /* ! defined (TCGETA) */
2360 Your configuration files are messed up
.
2361 /* If your system configuration files define SIGNALS_VIA_CHARACTERS,
2362 you'd better be using one of the alternatives above! */
2363 #endif /* ! defined (TCGETA) */
2364 #endif /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
2365 #endif /* ! defined (SIGNALS_VIA_CHARACTERS) */
2368 /* Get the pgrp using the tty itself, if we have that.
2369 Otherwise, use the pty to get the pgrp.
2370 On pfa systems, saka@pfu.fujitsu.co.JP writes:
2371 "TIOCGPGRP symbol defined in sys/ioctl.h at E50.
2372 But, TIOCGPGRP does not work on E50 ;-P works fine on E60"
2373 His patch indicates that if TIOCGPGRP returns an error, then
2374 we should just assume that p->pid is also the process group id. */
2378 if (!NILP (p
->subtty
))
2379 err
= ioctl (XFASTINT (p
->subtty
), TIOCGPGRP
, &gid
);
2381 err
= ioctl (XFASTINT (p
->infd
), TIOCGPGRP
, &gid
);
2385 gid
= - XFASTINT (p
->pid
);
2386 #endif /* ! defined (pfa) */
2392 #else /* ! defined (TIOCGPGRP ) */
2393 /* Can't select pgrps on this system, so we know that
2394 the child itself heads the pgrp. */
2395 gid
= - XFASTINT (p
->pid
);
2396 #endif /* ! defined (TIOCGPGRP ) */
2399 gid
= - XFASTINT (p
->pid
);
2405 p
->raw_status_low
= Qnil
;
2406 p
->raw_status_high
= Qnil
;
2408 XSETINT (p
->tick
, ++process_tick
);
2412 #endif /* ! defined (SIGCONT) */
2415 send_process (proc
, "\003", 1); /* ^C */
2420 send_process (proc
, "\031", 1); /* ^Y */
2425 sys$
forcex (&(XFASTINT (p
->pid
)), 0, 1);
2428 flush_pending_output (XFASTINT (p
->infd
));
2432 /* If we don't have process groups, send the signal to the immediate
2433 subprocess. That isn't really right, but it's better than any
2434 obvious alternative. */
2437 kill (XFASTINT (p
->pid
), signo
);
2441 /* gid may be a pid, or minus a pgrp's number */
2443 if (!NILP (current_group
))
2444 ioctl (XFASTINT (p
->infd
), TIOCSIGSEND
, signo
);
2447 gid
= - XFASTINT (p
->pid
);
2450 #else /* ! defined (TIOCSIGSEND) */
2451 EMACS_KILLPG (-gid
, signo
);
2452 #endif /* ! defined (TIOCSIGSEND) */
2455 DEFUN ("interrupt-process", Finterrupt_process
, Sinterrupt_process
, 0, 2, 0,
2456 "Interrupt process PROCESS. May be process or name of one.\n\
2457 PROCESS may be a process, a buffer, or the name of a process or buffer.\n\
2458 Nil or no arg means current buffer's process.\n\
2459 Second arg CURRENT-GROUP non-nil means send signal to\n\
2460 the current process-group of the process's controlling terminal\n\
2461 rather than to the process's own process group.\n\
2462 If the process is a shell, this means interrupt current subjob\n\
2463 rather than the shell.")
2464 (process
, current_group
)
2465 Lisp_Object process
, current_group
;
2467 process_send_signal (process
, SIGINT
, current_group
, 0);
2471 DEFUN ("kill-process", Fkill_process
, Skill_process
, 0, 2, 0,
2472 "Kill process PROCESS. May be process or name of one.\n\
2473 See function `interrupt-process' for more details on usage.")
2474 (process
, current_group
)
2475 Lisp_Object process
, current_group
;
2477 process_send_signal (process
, SIGKILL
, current_group
, 0);
2481 DEFUN ("quit-process", Fquit_process
, Squit_process
, 0, 2, 0,
2482 "Send QUIT signal to process PROCESS. May be process or name of one.\n\
2483 See function `interrupt-process' for more details on usage.")
2484 (process
, current_group
)
2485 Lisp_Object process
, current_group
;
2487 process_send_signal (process
, SIGQUIT
, current_group
, 0);
2491 DEFUN ("stop-process", Fstop_process
, Sstop_process
, 0, 2, 0,
2492 "Stop process PROCESS. May be process or name of one.\n\
2493 See function `interrupt-process' for more details on usage.")
2494 (process
, current_group
)
2495 Lisp_Object process
, current_group
;
2498 error ("no SIGTSTP support");
2500 process_send_signal (process
, SIGTSTP
, current_group
, 0);
2505 DEFUN ("continue-process", Fcontinue_process
, Scontinue_process
, 0, 2, 0,
2506 "Continue process PROCESS. May be process or name of one.\n\
2507 See function `interrupt-process' for more details on usage.")
2508 (process
, current_group
)
2509 Lisp_Object process
, current_group
;
2512 process_send_signal (process
, SIGCONT
, current_group
, 0);
2514 error ("no SIGCONT support");
2519 DEFUN ("signal-process", Fsignal_process
, Ssignal_process
,
2520 2, 2, "nProcess number: \nnSignal code: ",
2521 "Send the process with number PID the signal with code CODE.\n\
2522 Both PID and CODE are integers.")
2524 Lisp_Object pid
, sig
;
2526 CHECK_NUMBER (pid
, 0);
2527 CHECK_NUMBER (sig
, 1);
2528 return make_number (kill (XINT (pid
), XINT (sig
)));
2531 DEFUN ("process-send-eof", Fprocess_send_eof
, Sprocess_send_eof
, 0, 1, 0,
2532 "Make PROCESS see end-of-file in its input.\n\
2533 Eof comes after any text already sent to it.\n\
2534 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
2535 nil, indicating the current buffer's process.")
2537 Lisp_Object process
;
2541 proc
= get_process (process
);
2542 /* Sending a zero-length record is supposed to mean eof
2543 when TIOCREMOTE is turned on. */
2547 write (XFASTINT (XPROCESS (proc
)->outfd
), buf
, 0);
2549 #else /* did not do TOICREMOTE */
2551 send_process (proc
, "\032", 1); /* ^z */
2553 if (!NILP (XPROCESS (proc
)->pty_flag
))
2554 send_process (proc
, "\004", 1);
2557 close (XPROCESS (proc
)->outfd
);
2558 XFASTINT (XPROCESS (proc
)->outfd
) = open ("/dev/null", O_WRONLY
);
2561 #endif /* did not do TOICREMOTE */
2565 /* Kill all processes associated with `buffer'.
2566 If `buffer' is nil, kill all processes */
2568 kill_buffer_processes (buffer
)
2571 Lisp_Object tail
, proc
;
2573 for (tail
= Vprocess_alist
; XGCTYPE (tail
) == Lisp_Cons
;
2574 tail
= XCONS (tail
)->cdr
)
2576 proc
= XCONS (XCONS (tail
)->car
)->cdr
;
2577 if (XGCTYPE (proc
) == Lisp_Process
2578 && (NILP (buffer
) || EQ (XPROCESS (proc
)->buffer
, buffer
)))
2580 if (NETCONN_P (proc
))
2581 deactivate_process (proc
);
2582 else if (XFASTINT (XPROCESS (proc
)->infd
))
2583 process_send_signal (proc
, SIGHUP
, Qnil
, 1);
2588 /* On receipt of a signal that a child status has changed,
2589 loop asking about children with changed statuses until
2590 the system says there are no more.
2591 All we do is change the status;
2592 we do not run sentinels or print notifications.
2593 That is saved for the next time keyboard input is done,
2594 in order to avoid timing errors. */
2596 /** WARNING: this can be called during garbage collection.
2597 Therefore, it must not be fooled by the presence of mark bits in
2600 /** USG WARNING: Although it is not obvious from the documentation
2601 in signal(2), on a USG system the SIGCLD handler MUST NOT call
2602 signal() before executing at least one wait(), otherwise the handler
2603 will be called again, resulting in an infinite loop. The relevant
2604 portion of the documentation reads "SIGCLD signals will be queued
2605 and the signal-catching function will be continually reentered until
2606 the queue is empty". Invoking signal() causes the kernel to reexamine
2607 the SIGCLD queue. Fred Fish, UniSoft Systems Inc. */
2610 sigchld_handler (signo
)
2613 int old_errno
= errno
;
2615 register struct Lisp_Process
*p
;
2619 sigheld
|= sigbit (SIGCHLD
);
2631 #endif /* no WUNTRACED */
2632 /* Keep trying to get a status until we get a definitive result. */
2636 pid
= wait3 (&w
, WNOHANG
| WUNTRACED
, 0);
2638 while (pid
<= 0 && errno
== EINTR
);
2642 /* A real failure. We have done all our job, so return. */
2644 /* USG systems forget handlers when they are used;
2645 must reestablish each time */
2647 signal (signo
, sigchld_handler
); /* WARNING - must come after wait3() */
2650 sigheld
&= ~sigbit (SIGCHLD
);
2658 #endif /* no WNOHANG */
2660 /* Find the process that signaled us, and record its status. */
2663 for (tail
= Vprocess_alist
; XSYMBOL (tail
) != XSYMBOL (Qnil
); tail
= XCONS (tail
)->cdr
)
2665 proc
= XCONS (XCONS (tail
)->car
)->cdr
;
2666 p
= XPROCESS (proc
);
2667 if (EQ (p
->childp
, Qt
) && XFASTINT (p
->pid
) == pid
)
2672 /* Look for an asynchronous process whose pid hasn't been filled
2675 for (tail
= Vprocess_alist
; XSYMBOL (tail
) != XSYMBOL (Qnil
); tail
= XCONS (tail
)->cdr
)
2677 proc
= XCONS (XCONS (tail
)->car
)->cdr
;
2678 p
= XPROCESS (proc
);
2679 if (XTYPE (p
->pid
) == Lisp_Int
&& XINT (p
->pid
) == -1)
2684 /* Change the status of the process that was found. */
2687 union { int i
; WAITTYPE wt
; } u
;
2689 XSETINT (p
->tick
, ++process_tick
);
2691 XFASTINT (p
->raw_status_low
) = u
.i
& 0xffff;
2692 XFASTINT (p
->raw_status_high
) = u
.i
>> 16;
2694 /* If process has terminated, stop waiting for its output. */
2695 if (WIFSIGNALED (w
) || WIFEXITED (w
))
2696 if (XFASTINT (p
->infd
))
2697 FD_CLR (XFASTINT (p
->infd
), &input_wait_mask
);
2700 /* There was no asynchronous process found for that id. Check
2701 if we have a synchronous process. */
2704 synch_process_alive
= 0;
2706 /* Report the status of the synchronous process. */
2708 synch_process_retcode
= WRETCODE (w
);
2709 else if (WIFSIGNALED (w
))
2711 synch_process_death
= sys_siglist
[WTERMSIG (w
)];
2713 synch_process_death
= sys_errlist
[WTERMSIG (w
)];
2717 /* On some systems, we must return right away.
2718 If any more processes want to signal us, we will
2720 Otherwise (on systems that have WNOHANG), loop around
2721 to use up all the processes that have something to tell us. */
2722 #if defined (USG) && ! (defined (HPUX) && defined (WNOHANG))
2724 signal (signo
, sigchld_handler
);
2728 #endif /* USG, but not HPUX with WNOHANG */
2734 exec_sentinel_unwind (data
)
2737 XPROCESS (XCONS (data
)->car
)->sentinel
= XCONS (data
)->cdr
;
2742 exec_sentinel (proc
, reason
)
2743 Lisp_Object proc
, reason
;
2745 Lisp_Object sentinel
;
2746 register struct Lisp_Process
*p
= XPROCESS (proc
);
2747 int count
= specpdl_ptr
- specpdl
;
2749 sentinel
= p
->sentinel
;
2750 if (NILP (sentinel
))
2753 /* Zilch the sentinel while it's running, to avoid recursive invocations;
2754 assure that it gets restored no matter how the sentinel exits. */
2756 record_unwind_protect (exec_sentinel_unwind
, Fcons (proc
, sentinel
));
2757 /* Inhibit quit so that random quits don't screw up a running filter. */
2758 specbind (Qinhibit_quit
, Qt
);
2759 call2 (sentinel
, proc
, reason
);
2763 /* Report all recent events of a change in process status
2764 (either run the sentinel or output a message).
2765 This is done while Emacs is waiting for keyboard input. */
2769 register Lisp_Object proc
, buffer
;
2770 Lisp_Object tail
= Qnil
;
2771 Lisp_Object msg
= Qnil
;
2772 struct gcpro gcpro1
, gcpro2
;
2774 /* We need to gcpro tail; if read_process_output calls a filter
2775 which deletes a process and removes the cons to which tail points
2776 from Vprocess_alist, and then causes a GC, tail is an unprotected
2780 for (tail
= Vprocess_alist
; !NILP (tail
); tail
= Fcdr (tail
))
2783 register struct Lisp_Process
*p
;
2785 proc
= Fcdr (Fcar (tail
));
2786 p
= XPROCESS (proc
);
2788 if (XINT (p
->tick
) != XINT (p
->update_tick
))
2790 XSETINT (p
->update_tick
, XINT (p
->tick
));
2792 /* If process is still active, read any output that remains. */
2793 if (XFASTINT (p
->infd
))
2794 while (read_process_output (proc
, XFASTINT (p
->infd
)) > 0);
2798 /* Get the text to use for the message. */
2799 if (!NILP (p
->raw_status_low
))
2801 msg
= status_message (p
->status
);
2803 /* If process is terminated, deactivate it or delete it. */
2805 if (XTYPE (p
->status
) == Lisp_Cons
)
2806 symbol
= XCONS (p
->status
)->car
;
2808 if (EQ (symbol
, Qsignal
) || EQ (symbol
, Qexit
)
2809 || EQ (symbol
, Qclosed
))
2811 if (delete_exited_processes
)
2812 remove_process (proc
);
2814 deactivate_process (proc
);
2817 /* Now output the message suitably. */
2818 if (!NILP (p
->sentinel
))
2819 exec_sentinel (proc
, msg
);
2820 /* Don't bother with a message in the buffer
2821 when a process becomes runnable. */
2822 else if (!EQ (symbol
, Qrun
) && !NILP (buffer
))
2824 Lisp_Object ro
= XBUFFER (buffer
)->read_only
;
2826 struct buffer
*old
= current_buffer
;
2829 /* Avoid error if buffer is deleted
2830 (probably that's why the process is dead, too) */
2831 if (NILP (XBUFFER (buffer
)->name
))
2833 Fset_buffer (buffer
);
2835 /* Insert new output into buffer
2836 at the current end-of-output marker,
2837 thus preserving logical ordering of input and output. */
2838 if (XMARKER (p
->mark
)->buffer
)
2839 SET_PT (marker_position (p
->mark
));
2842 if (point
<= opoint
)
2843 opoint
+= XSTRING (msg
)->size
+ XSTRING (p
->name
)->size
+ 10;
2845 tem
= current_buffer
->read_only
;
2846 current_buffer
->read_only
= Qnil
;
2847 insert_string ("\nProcess ");
2848 Finsert (1, &p
->name
);
2849 insert_string (" ");
2851 current_buffer
->read_only
= tem
;
2852 Fset_marker (p
->mark
, make_number (point
), p
->buffer
);
2855 set_buffer_internal (old
);
2860 update_mode_lines
++; /* in case buffers use %s in mode-line-format */
2861 redisplay_preserve_echo_area ();
2863 update_tick
= process_tick
;
2874 if (! noninteractive
|| initialized
)
2876 signal (SIGCHLD
, sigchld_handler
);
2879 FD_ZERO (&input_wait_mask
);
2880 FD_SET (0, &input_wait_mask
);
2881 Vprocess_alist
= Qnil
;
2882 for (i
= 0; i
< MAXDESC
; i
++)
2884 chan_process
[i
] = Qnil
;
2885 proc_buffered_char
[i
] = -1;
2889 DEFUN ("process-connection", Fprocess_connection
, Sprocess_connection
, 0, 1, 0,
2890 "Return the connection type of `PROCESS'. This can be nil (pipe),\n\
2891 t or pty (pty) or stream (socket connection).")
2893 Lisp_Object process
;
2895 return XPROCESS (process
)->type
;
2901 stream_process
= intern ("stream");
2903 Qprocessp
= intern ("processp");
2904 staticpro (&Qprocessp
);
2905 Qrun
= intern ("run");
2907 Qstop
= intern ("stop");
2909 Qsignal
= intern ("signal");
2910 staticpro (&Qsignal
);
2912 /* Qexit is already staticpro'd by syms_of_eval; don't staticpro it
2915 Qexit = intern ("exit");
2916 staticpro (&Qexit); */
2918 Qopen
= intern ("open");
2920 Qclosed
= intern ("closed");
2921 staticpro (&Qclosed
);
2923 staticpro (&Vprocess_alist
);
2925 DEFVAR_BOOL ("delete-exited-processes", &delete_exited_processes
,
2926 "*Non-nil means delete processes immediately when they exit.\n\
2927 nil means don't delete them until `list-processes' is run.");
2929 delete_exited_processes
= 1;
2931 DEFVAR_LISP ("process-connection-type", &Vprocess_connection_type
,
2932 "Control type of device used to communicate with subprocesses.\n\
2933 Values are nil to use a pipe, and t or 'pty for a pty. Note that if\n\
2934 pty's are not available, this variable will be ignored. The value takes\n\
2935 effect when `start-process' is called.");
2936 Vprocess_connection_type
= Qt
;
2938 defsubr (&Sprocessp
);
2939 defsubr (&Sget_process
);
2940 defsubr (&Sget_buffer_process
);
2941 defsubr (&Sdelete_process
);
2942 defsubr (&Sprocess_status
);
2943 defsubr (&Sprocess_exit_status
);
2944 defsubr (&Sprocess_id
);
2945 defsubr (&Sprocess_name
);
2946 defsubr (&Sprocess_command
);
2947 defsubr (&Sset_process_buffer
);
2948 defsubr (&Sprocess_buffer
);
2949 defsubr (&Sprocess_mark
);
2950 defsubr (&Sset_process_filter
);
2951 defsubr (&Sprocess_filter
);
2952 defsubr (&Sset_process_sentinel
);
2953 defsubr (&Sprocess_sentinel
);
2954 defsubr (&Sprocess_kill_without_query
);
2955 defsubr (&Slist_processes
);
2956 defsubr (&Sprocess_list
);
2957 defsubr (&Sstart_process
);
2959 defsubr (&Sopen_network_stream
);
2960 #endif /* HAVE_SOCKETS */
2961 defsubr (&Saccept_process_output
);
2962 defsubr (&Sprocess_send_region
);
2963 defsubr (&Sprocess_send_string
);
2964 defsubr (&Sinterrupt_process
);
2965 defsubr (&Skill_process
);
2966 defsubr (&Squit_process
);
2967 defsubr (&Sstop_process
);
2968 defsubr (&Scontinue_process
);
2969 defsubr (&Sprocess_send_eof
);
2970 defsubr (&Ssignal_process
);
2971 defsubr (&Swaiting_for_user_input_p
);
2972 /* defsubr (&Sprocess_connection); */
2976 #else /* not subprocesses */
2978 #include <sys/types.h>
2982 #include "systime.h"
2983 #include "termopts.h"
2985 extern int frame_garbaged
;
2988 /* As described above, except assuming that there are no subprocesses:
2990 Wait for timeout to elapse and/or keyboard input to be available.
2993 timeout in seconds, or
2994 zero for no limit, or
2995 -1 means gobble data immediately available but don't wait for any.
2997 read_kbd is a Lisp_Object:
2998 0 to ignore keyboard input, or
2999 1 to return when input is available, or
3000 -1 means caller will actually read the input, so don't throw to
3002 We know that read_kbd will never be a Lisp_Process, since
3003 `subprocesses' isn't defined.
3005 do_display != 0 means redisplay should be done to show subprocess
3006 output that arrives. This version of the function ignores it.
3008 Return true iff we recieved input from any process. */
3011 wait_reading_process_input (time_limit
, microsecs
, read_kbd
, do_display
)
3012 int time_limit
, microsecs
;
3013 Lisp_Object read_kbd
;
3016 EMACS_TIME end_time
, timeout
, *timeout_p
;
3019 /* What does time_limit really mean? */
3020 if (time_limit
|| microsecs
)
3022 /* It's not infinite. */
3023 timeout_p
= &timeout
;
3025 if (time_limit
== -1)
3026 /* In fact, it's zero. */
3027 EMACS_SET_SECS_USECS (timeout
, 0, 0);
3029 EMACS_SET_SECS_USECS (timeout
, time_limit
, microsecs
);
3031 /* How far in the future is that? */
3032 EMACS_GET_TIME (end_time
);
3033 EMACS_ADD_TIME (end_time
, end_time
, timeout
);
3036 /* It's infinite. */
3039 /* Turn off periodic alarms (in case they are in use)
3040 because the select emulator uses alarms. */
3047 waitchannels
= XINT (read_kbd
) ? 1 : 0;
3049 /* If calling from keyboard input, do not quit
3050 since we want to return C-g as an input character.
3051 Otherwise, do pending quit if requested. */
3052 if (XINT (read_kbd
) >= 0)
3057 EMACS_GET_TIME (*timeout_p
);
3058 EMACS_SUB_TIME (*timeout_p
, end_time
, *timeout_p
);
3059 if (EMACS_TIME_NEG_P (*timeout_p
))
3063 /* Cause C-g and alarm signals to take immediate action,
3064 and cause input available signals to zero out timeout. */
3065 if (XINT (read_kbd
) < 0)
3066 set_waiting_for_input (&timeout
);
3068 /* If a frame has been newly mapped and needs updating,
3069 reprocess its display stuff. */
3071 redisplay_preserve_echo_area ();
3073 if (XINT (read_kbd
) && detect_input_pending ())
3076 nfds
= select (1, &waitchannels
, 0, 0, timeout_p
);
3078 /* Make C-g and alarm signals set flags again */
3079 clear_waiting_for_input ();
3081 /* If we woke up due to SIGWINCH, actually change size now. */
3082 do_pending_window_change ();
3086 /* If the system call was interrupted, then go around the
3092 else if (nfds
> 0 && (waitchannels
& 1) && interrupt_input
)
3093 /* System sometimes fails to deliver SIGIO. */
3094 kill (getpid (), SIGIO
);
3096 if (XINT (read_kbd
) && interrupt_input
&& (waitchannels
& 1))
3099 /* If we have timed out (nfds == 0) or found some input (nfds > 0),
3109 DEFUN ("get-buffer-process", Fget_buffer_process
, Sget_buffer_process
, 1, 1, 0,
3110 "Return the (or, a) process associated with BUFFER.\n\
3111 This copy of Emacs has not been built to support subprocesses, so this\n\
3112 function always returns nil.")
3114 register Lisp_Object name
;
3119 /* Kill all processes associated with `buffer'.
3120 If `buffer' is nil, kill all processes.
3121 Since we have no subprocesses, this does nothing. */
3123 kill_buffer_processes (buffer
)
3134 defsubr (&Sget_buffer_process
);
3138 #endif /* not subprocesses */