1 /* Asynchronous subprocess control for GNU Emacs.
2 Copyright (C) 1985, 86, 87, 88, 93, 94 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 */
45 #ifdef HAVE_SOCKETS /* TCP connection support, if kernel can do it */
46 #include <sys/socket.h>
48 #include <netinet/in.h>
49 #include <arpa/inet.h>
50 #endif /* HAVE_SOCKETS */
52 /* TERM is a poor-man's SLIP, used on Linux. */
57 /* DGUX inet_addr returns a 'struct in_addr'. */
59 #define IN_ADDR struct in_addr
60 #define NUMERIC_ADDR_ERROR (numeric_addr.s_addr == -1)
62 #define IN_ADDR unsigned long
63 #define NUMERIC_ADDR_ERROR (numeric_addr == -1)
66 #if defined(BSD) || defined(STRIDE)
67 #include <sys/ioctl.h>
68 #if !defined (O_NDELAY) && defined (HAVE_PTYS) && !defined(USG5)
70 #endif /* HAVE_PTYS and no O_NDELAY */
71 #endif /* BSD or STRIDE */
73 #ifdef BROKEN_O_NONBLOCK
75 #endif /* BROKEN_O_NONBLOCK */
82 #include <sys/sysmacros.h> /* for "minor" */
92 #include "termhooks.h"
97 Lisp_Object Qprocessp
;
98 Lisp_Object Qrun
, Qstop
, Qsignal
, Qopen
, Qclosed
;
99 /* Qexit is declared and initialized in eval.c. */
101 /* a process object is a network connection when its childp field is neither
102 Qt nor Qnil but is instead a string (name of foreign host we
103 are connected to + name of port we are connected to) */
106 static Lisp_Object stream_process
;
108 #define NETCONN_P(p) (XGCTYPE (XPROCESS (p)->childp) == Lisp_String)
110 #define NETCONN_P(p) 0
111 #endif /* HAVE_SOCKETS */
113 /* Define first descriptor number available for subprocesses. */
115 #define FIRST_PROC_DESC 1
117 #define FIRST_PROC_DESC 3
120 /* Define SIGCHLD as an alias for SIGCLD. There are many conditionals
123 #if !defined (SIGCHLD) && defined (SIGCLD)
124 #define SIGCHLD SIGCLD
127 #include "syssignal.h"
132 extern char *strerror ();
134 extern char *sys_errlist
[];
137 #ifndef SYS_SIGLIST_DECLARED
141 extern char *sys_siglist
[];
142 #endif /* not LINUX */
144 char *sys_siglist
[] =
150 "illegal instruction",
154 "floating point exception",
157 "segmentation violation",
158 "bad argument to system call",
159 "write on a pipe with no one to read it",
161 "software termination signal from kill",
163 "sendable stop signal not from tty",
164 "stop signal from tty",
165 "continue a stopped process",
166 "child status has changed",
167 "background read attempted from control tty",
168 "background write attempted from control tty",
169 "input record available at control tty",
170 "exceeded CPU time limit",
171 "exceeded file size limit"
175 #endif /* ! SYS_SIGLIST_DECLARED */
177 /* t means use pty, nil means use a pipe,
178 maybe other values to come. */
179 static Lisp_Object Vprocess_connection_type
;
183 #include <sys/socket.h>
187 /* Number of events of change of status of a process. */
188 static int process_tick
;
190 /* Number of events for which the user or sentinel has been notified. */
191 static int update_tick
;
194 /* We could get this from param.h, but better not to depend on finding that.
195 And better not to risk that it might define other symbols used in this
198 #define MAXDESC FD_SETSIZE
202 #define SELECT_TYPE fd_set
203 #else /* no FD_SET */
205 #define SELECT_TYPE int
207 /* Define the macros to access a single-int bitmap of descriptors. */
208 #define FD_SET(n, p) (*(p) |= (1 << (n)))
209 #define FD_CLR(n, p) (*(p) &= ~(1 << (n)))
210 #define FD_ISSET(n, p) (*(p) & (1 << (n)))
211 #define FD_ZERO(p) (*(p) = 0)
212 #endif /* no FD_SET */
214 /* Mask of bits indicating the descriptors that we wait for input on */
216 static SELECT_TYPE input_wait_mask
;
218 /* Descriptor to use for keyboard input. */
219 static int keyboard_descriptor
;
221 /* Nonzero means delete a process right away if it exits. */
222 static int delete_exited_processes
;
224 /* Indexed by descriptor, gives the process (if any) for that descriptor */
225 Lisp_Object chan_process
[MAXDESC
];
227 /* Alist of elements (NAME . PROCESS) */
228 Lisp_Object Vprocess_alist
;
230 /* Buffered-ahead input char from process, indexed by channel.
231 -1 means empty (no char is buffered).
232 Used on sys V where the only way to tell if there is any
233 output from the process is to read at least one char.
234 Always -1 on systems that support FIONREAD. */
236 static int proc_buffered_char
[MAXDESC
];
238 static Lisp_Object
get_process ();
240 /* Maximum number of bytes to send to a pty without an eof. */
241 static int pty_max_bytes
;
243 /* Compute the Lisp form of the process status, p->status, from
244 the numeric status that was returned by `wait'. */
246 Lisp_Object
status_convert ();
249 struct Lisp_Process
*p
;
251 union { int i
; WAITTYPE wt
; } u
;
252 u
.i
= XFASTINT (p
->raw_status_low
) + (XFASTINT (p
->raw_status_high
) << 16);
253 p
->status
= status_convert (u
.wt
);
254 p
->raw_status_low
= Qnil
;
255 p
->raw_status_high
= Qnil
;
258 /* Convert a process status word in Unix format to
259 the list that we use internally. */
266 return Fcons (Qstop
, Fcons (make_number (WSTOPSIG (w
)), Qnil
));
267 else if (WIFEXITED (w
))
268 return Fcons (Qexit
, Fcons (make_number (WRETCODE (w
)),
269 WCOREDUMP (w
) ? Qt
: Qnil
));
270 else if (WIFSIGNALED (w
))
271 return Fcons (Qsignal
, Fcons (make_number (WTERMSIG (w
)),
272 WCOREDUMP (w
) ? Qt
: Qnil
));
277 /* Given a status-list, extract the three pieces of information
278 and store them individually through the three pointers. */
281 decode_status (l
, symbol
, code
, coredump
)
289 if (XTYPE (l
) == Lisp_Symbol
)
297 *symbol
= XCONS (l
)->car
;
298 tem
= XCONS (l
)->cdr
;
299 *code
= XFASTINT (XCONS (tem
)->car
);
300 tem
= XCONS (tem
)->cdr
;
301 *coredump
= !NILP (tem
);
305 /* Return a string describing a process status list. */
308 status_message (status
)
313 Lisp_Object string
, string2
;
315 decode_status (status
, &symbol
, &code
, &coredump
);
317 if (EQ (symbol
, Qsignal
) || EQ (symbol
, Qstop
))
323 signame
= sys_siglist
[code
];
325 signame
= sys_errlist
[code
];
330 string
= build_string (signame
);
331 string2
= build_string (coredump
? " (core dumped)\n" : "\n");
332 XSTRING (string
)->data
[0] = DOWNCASE (XSTRING (string
)->data
[0]);
333 return concat2 (string
, string2
);
335 else if (EQ (symbol
, Qexit
))
338 return build_string ("finished\n");
339 string
= Fnumber_to_string (make_number (code
));
340 string2
= build_string (coredump
? " (core dumped)\n" : "\n");
341 return concat2 (build_string ("exited abnormally with code "),
342 concat2 (string
, string2
));
345 return Fcopy_sequence (Fsymbol_name (symbol
));
350 /* Open an available pty, returning a file descriptor.
351 Return -1 on failure.
352 The file name of the terminal corresponding to the pty
353 is left in the variable pty_name. */
364 /* Some systems name their pseudoterminals so that there are gaps in
365 the usual sequence - for example, on HP9000/S700 systems, there
366 are no pseudoterminals with names ending in 'f'. So we wait for
367 three failures in a row before deciding that we've reached the
369 int failed_count
= 0;
374 for (c
= FIRST_PTY_LETTER
; c
<= 'z'; c
++)
375 for (i
= 0; i
< 16; i
++)
378 #ifdef PTY_NAME_SPRINTF
381 sprintf (pty_name
, "/dev/pty%c%x", c
, i
);
382 #endif /* no PTY_NAME_SPRINTF */
386 #else /* no PTY_OPEN */
388 /* Unusual IRIS code */
389 *ptyv
= open ("/dev/ptc", O_RDWR
| O_NDELAY
, 0);
392 if (fstat (fd
, &stb
) < 0)
395 if (stat (pty_name
, &stb
) < 0)
398 if (failed_count
>= 3)
404 fd
= open (pty_name
, O_RDWR
| O_NONBLOCK
, 0);
406 fd
= open (pty_name
, O_RDWR
| O_NDELAY
, 0);
408 #endif /* not IRIS */
409 #endif /* no PTY_OPEN */
413 /* check to make certain that both sides are available
414 this avoids a nasty yet stupid bug in rlogins */
415 #ifdef PTY_TTY_NAME_SPRINTF
418 sprintf (pty_name
, "/dev/tty%c%x", c
, i
);
419 #endif /* no PTY_TTY_NAME_SPRINTF */
421 if (access (pty_name
, 6) != 0)
424 #if !defined(IRIS) && !defined(__sgi)
430 #endif /* not UNIPLUS */
437 #endif /* HAVE_PTYS */
443 register Lisp_Object val
, tem
, name1
;
444 register struct Lisp_Process
*p
;
448 /* size of process structure includes the vector header,
449 so deduct for that. But struct Lisp_Vector includes the first
450 element, thus deducts too much, so add it back. */
451 val
= Fmake_vector (make_number ((sizeof (struct Lisp_Process
)
452 - sizeof (struct Lisp_Vector
)
453 + sizeof (Lisp_Object
))
454 / sizeof (Lisp_Object
)),
456 XSETTYPE (val
, Lisp_Process
);
459 XSET (p
->infd
, Lisp_Int
, -1);
460 XSET (p
->outfd
, Lisp_Int
, -1);
461 XFASTINT (p
->pid
) = 0;
462 XFASTINT (p
->tick
) = 0;
463 XFASTINT (p
->update_tick
) = 0;
464 p
->raw_status_low
= Qnil
;
465 p
->raw_status_high
= Qnil
;
467 p
->mark
= Fmake_marker ();
469 /* If name is already in use, modify it until it is unused. */
474 tem
= Fget_process (name1
);
475 if (NILP (tem
)) break;
476 sprintf (suffix
, "<%d>", i
);
477 name1
= concat2 (name
, build_string (suffix
));
481 Vprocess_alist
= Fcons (Fcons (name
, val
), Vprocess_alist
);
485 remove_process (proc
)
486 register Lisp_Object proc
;
488 register Lisp_Object pair
;
490 pair
= Frassq (proc
, Vprocess_alist
);
491 Vprocess_alist
= Fdelq (pair
, Vprocess_alist
);
492 Fset_marker (XPROCESS (proc
)->mark
, Qnil
, Qnil
);
494 deactivate_process (proc
);
497 DEFUN ("processp", Fprocessp
, Sprocessp
, 1, 1, 0,
498 "Return t if OBJECT is a process.")
502 return XTYPE (obj
) == Lisp_Process
? Qt
: Qnil
;
505 DEFUN ("get-process", Fget_process
, Sget_process
, 1, 1, 0,
506 "Return the process named NAME, or nil if there is none.")
508 register Lisp_Object name
;
510 if (XTYPE (name
) == Lisp_Process
)
512 CHECK_STRING (name
, 0);
513 return Fcdr (Fassoc (name
, Vprocess_alist
));
516 DEFUN ("get-buffer-process", Fget_buffer_process
, Sget_buffer_process
, 1, 1, 0,
517 "Return the (or, a) process associated with BUFFER.\n\
518 BUFFER may be a buffer or the name of one.")
520 register Lisp_Object name
;
522 register Lisp_Object buf
, tail
, proc
;
524 if (NILP (name
)) return Qnil
;
525 buf
= Fget_buffer (name
);
526 if (NILP (buf
)) return Qnil
;
528 for (tail
= Vprocess_alist
; !NILP (tail
); tail
= Fcdr (tail
))
530 proc
= Fcdr (Fcar (tail
));
531 if (XTYPE (proc
) == Lisp_Process
&& EQ (XPROCESS (proc
)->buffer
, buf
))
537 /* This is how commands for the user decode process arguments. It
538 accepts a process, a process name, a buffer, a buffer name, or nil.
539 Buffers denote the first process in the buffer, and nil denotes the
544 register Lisp_Object name
;
546 register Lisp_Object proc
, obj
;
549 obj
= Fget_process (name
);
551 obj
= Fget_buffer (name
);
553 error ("Process %s does not exist", XSTRING (name
)->data
);
555 else if (NILP (name
))
556 obj
= Fcurrent_buffer ();
560 /* Now obj should be either a buffer object or a process object.
564 proc
= Fget_buffer_process (obj
);
566 error ("Buffer %s has no process", XSTRING (XBUFFER (obj
)->name
)->data
);
570 CHECK_PROCESS (obj
, 0);
576 DEFUN ("delete-process", Fdelete_process
, Sdelete_process
, 1, 1, 0,
577 "Delete PROCESS: kill it and forget about it immediately.\n\
578 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
579 nil, indicating the current buffer's process.")
581 register Lisp_Object proc
;
583 proc
= get_process (proc
);
584 XPROCESS (proc
)->raw_status_low
= Qnil
;
585 XPROCESS (proc
)->raw_status_high
= Qnil
;
586 if (NETCONN_P (proc
))
588 XPROCESS (proc
)->status
= Fcons (Qexit
, Fcons (make_number (0), Qnil
));
589 XSETINT (XPROCESS (proc
)->tick
, ++process_tick
);
591 else if (XINT (XPROCESS (proc
)->infd
) >= 0)
593 Fkill_process (proc
, Qnil
);
594 /* Do this now, since remove_process will make sigchld_handler do nothing. */
595 XPROCESS (proc
)->status
596 = Fcons (Qsignal
, Fcons (make_number (SIGKILL
), Qnil
));
597 XSETINT (XPROCESS (proc
)->tick
, ++process_tick
);
600 remove_process (proc
);
604 DEFUN ("process-status", Fprocess_status
, Sprocess_status
, 1, 1, 0,
605 "Return the status of PROCESS: a symbol, one of these:\n\
606 run -- for a process that is running.\n\
607 stop -- for a process stopped but continuable.\n\
608 exit -- for a process that has exited.\n\
609 signal -- for a process that has got a fatal signal.\n\
610 open -- for a network stream connection that is open.\n\
611 closed -- for a network stream connection that is closed.\n\
612 nil -- if arg is a process name and no such process exists.\n\
613 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
614 nil, indicating the current buffer's process.")
616 register Lisp_Object proc
;
618 register struct Lisp_Process
*p
;
619 register Lisp_Object status
;
620 proc
= get_process (proc
);
624 if (!NILP (p
->raw_status_low
))
627 if (XTYPE (status
) == Lisp_Cons
)
628 status
= XCONS (status
)->car
;
629 if (NETCONN_P (proc
))
631 if (EQ (status
, Qrun
))
633 else if (EQ (status
, Qexit
))
639 DEFUN ("process-exit-status", Fprocess_exit_status
, Sprocess_exit_status
,
641 "Return the exit status of PROCESS or the signal number that killed it.\n\
642 If PROCESS has not yet exited or died, return 0.")
644 register Lisp_Object proc
;
646 CHECK_PROCESS (proc
, 0);
647 if (!NILP (XPROCESS (proc
)->raw_status_low
))
648 update_status (XPROCESS (proc
));
649 if (XTYPE (XPROCESS (proc
)->status
) == Lisp_Cons
)
650 return XCONS (XCONS (XPROCESS (proc
)->status
)->cdr
)->car
;
651 return make_number (0);
654 DEFUN ("process-id", Fprocess_id
, Sprocess_id
, 1, 1, 0,
655 "Return the process id of PROCESS.\n\
656 This is the pid of the Unix process which PROCESS uses or talks to.\n\
657 For a network connection, this value is nil.")
659 register Lisp_Object proc
;
661 CHECK_PROCESS (proc
, 0);
662 return XPROCESS (proc
)->pid
;
665 DEFUN ("process-name", Fprocess_name
, Sprocess_name
, 1, 1, 0,
666 "Return the name of PROCESS, as a string.\n\
667 This is the name of the program invoked in PROCESS,\n\
668 possibly modified to make it unique among process names.")
670 register Lisp_Object proc
;
672 CHECK_PROCESS (proc
, 0);
673 return XPROCESS (proc
)->name
;
676 DEFUN ("process-command", Fprocess_command
, Sprocess_command
, 1, 1, 0,
677 "Return the command that was executed to start PROCESS.\n\
678 This is a list of strings, the first string being the program executed\n\
679 and the rest of the strings being the arguments given to it.\n\
680 For a non-child channel, this is nil.")
682 register Lisp_Object proc
;
684 CHECK_PROCESS (proc
, 0);
685 return XPROCESS (proc
)->command
;
688 DEFUN ("set-process-buffer", Fset_process_buffer
, Sset_process_buffer
,
690 "Set buffer associated with PROCESS to BUFFER (a buffer, or nil).")
692 register Lisp_Object proc
, buffer
;
694 CHECK_PROCESS (proc
, 0);
696 CHECK_BUFFER (buffer
, 1);
697 XPROCESS (proc
)->buffer
= buffer
;
701 DEFUN ("process-buffer", Fprocess_buffer
, Sprocess_buffer
,
703 "Return the buffer PROCESS is associated with.\n\
704 Output from PROCESS is inserted in this buffer\n\
705 unless PROCESS has a filter.")
707 register Lisp_Object proc
;
709 CHECK_PROCESS (proc
, 0);
710 return XPROCESS (proc
)->buffer
;
713 DEFUN ("process-mark", Fprocess_mark
, Sprocess_mark
,
715 "Return the marker for the end of the last output from PROCESS.")
717 register Lisp_Object proc
;
719 CHECK_PROCESS (proc
, 0);
720 return XPROCESS (proc
)->mark
;
723 DEFUN ("set-process-filter", Fset_process_filter
, Sset_process_filter
,
725 "Give PROCESS the filter function FILTER; nil means no filter.\n\
726 t means stop accepting output from the process.\n\
727 When a process has a filter, each time it does output\n\
728 the entire string of output is passed to the filter.\n\
729 The filter gets two arguments: the process and the string of output.\n\
730 If the process has a filter, its buffer is not used for output.")
732 register Lisp_Object proc
, filter
;
734 CHECK_PROCESS (proc
, 0);
736 FD_CLR (XINT (XPROCESS (proc
)->infd
), &input_wait_mask
);
737 else if (EQ (XPROCESS (proc
)->filter
, Qt
))
738 FD_SET (XINT (XPROCESS (proc
)->infd
), &input_wait_mask
);
739 XPROCESS (proc
)->filter
= filter
;
743 DEFUN ("process-filter", Fprocess_filter
, Sprocess_filter
,
745 "Returns the filter function of PROCESS; nil if none.\n\
746 See `set-process-filter' for more info on filter functions.")
748 register Lisp_Object proc
;
750 CHECK_PROCESS (proc
, 0);
751 return XPROCESS (proc
)->filter
;
754 DEFUN ("set-process-sentinel", Fset_process_sentinel
, Sset_process_sentinel
,
756 "Give PROCESS the sentinel SENTINEL; nil for none.\n\
757 The sentinel is called as a function when the process changes state.\n\
758 It gets two arguments: the process, and a string describing the change.")
760 register Lisp_Object proc
, sentinel
;
762 CHECK_PROCESS (proc
, 0);
763 XPROCESS (proc
)->sentinel
= sentinel
;
767 DEFUN ("process-sentinel", Fprocess_sentinel
, Sprocess_sentinel
,
769 "Return the sentinel of PROCESS; nil if none.\n\
770 See `set-process-sentinel' for more info on sentinels.")
772 register Lisp_Object proc
;
774 CHECK_PROCESS (proc
, 0);
775 return XPROCESS (proc
)->sentinel
;
778 DEFUN ("process-kill-without-query", Fprocess_kill_without_query
,
779 Sprocess_kill_without_query
, 1, 2, 0,
780 "Say no query needed if PROCESS is running when Emacs is exited.\n\
781 Optional second argument if non-nil says to require a query.\n\
782 Value is t if a query was formerly required.")
784 register Lisp_Object proc
, value
;
788 CHECK_PROCESS (proc
, 0);
789 tem
= XPROCESS (proc
)->kill_without_query
;
790 XPROCESS (proc
)->kill_without_query
= Fnull (value
);
795 #if 0 /* Turned off because we don't currently record this info
796 in the process. Perhaps add it. */
797 DEFUN ("process-connection", Fprocess_connection
, Sprocess_connection
, 1, 1, 0,
798 "Return the connection type of `PROCESS'.\n\
799 The value is `nil' for a pipe,\n\
800 `t' or `pty' for a pty, or `stream' for a socket connection.")
804 return XPROCESS (process
)->type
;
811 register Lisp_Object tail
, tem
;
812 Lisp_Object proc
, minspace
, tem1
;
813 register struct buffer
*old
= current_buffer
;
814 register struct Lisp_Process
*p
;
818 XFASTINT (minspace
) = 1;
820 set_buffer_internal (XBUFFER (Vstandard_output
));
821 Fbuffer_disable_undo (Vstandard_output
);
823 current_buffer
->truncate_lines
= Qt
;
826 Proc Status Buffer Command\n\
827 ---- ------ ------ -------\n", -1);
829 for (tail
= Vprocess_alist
; !NILP (tail
); tail
= Fcdr (tail
))
833 proc
= Fcdr (Fcar (tail
));
835 if (NILP (p
->childp
))
838 Finsert (1, &p
->name
);
839 Findent_to (make_number (13), minspace
);
841 if (!NILP (p
->raw_status_low
))
844 if (XTYPE (p
->status
) == Lisp_Cons
)
845 symbol
= XCONS (p
->status
)->car
;
848 if (EQ (symbol
, Qsignal
))
851 tem
= Fcar (Fcdr (p
->status
));
853 if (XINT (tem
) < NSIG
)
854 write_string (sys_errlist
[XINT (tem
)], -1);
857 Fprinc (symbol
, Qnil
);
859 else if (NETCONN_P (proc
))
861 if (EQ (symbol
, Qrun
))
862 write_string ("open", -1);
863 else if (EQ (symbol
, Qexit
))
864 write_string ("closed", -1);
866 Fprinc (symbol
, Qnil
);
869 Fprinc (symbol
, Qnil
);
871 if (EQ (symbol
, Qexit
))
874 tem
= Fcar (Fcdr (p
->status
));
877 sprintf (tembuf
, " %d", XFASTINT (tem
));
878 write_string (tembuf
, -1);
882 if (EQ (symbol
, Qsignal
) || EQ (symbol
, Qexit
))
883 remove_process (proc
);
885 Findent_to (make_number (22), minspace
);
886 if (NILP (p
->buffer
))
887 insert_string ("(none)");
888 else if (NILP (XBUFFER (p
->buffer
)->name
))
889 insert_string ("(Killed)");
891 Finsert (1, &XBUFFER (p
->buffer
)->name
);
893 Findent_to (make_number (37), minspace
);
895 if (NETCONN_P (proc
))
897 sprintf (tembuf
, "(network stream connection to %s)\n",
898 XSTRING (p
->childp
)->data
);
899 insert_string (tembuf
);
913 insert_string ("\n");
919 DEFUN ("list-processes", Flist_processes
, Slist_processes
, 0, 0, "",
920 "Display a list of all processes.\n\
921 \(Any processes listed as Exited or Signaled are actually eliminated\n\
922 after the listing is made.)")
925 internal_with_output_to_temp_buffer ("*Process List*",
926 list_processes_1
, Qnil
);
930 DEFUN ("process-list", Fprocess_list
, Sprocess_list
, 0, 0, 0,
931 "Return a list of all processes.")
934 return Fmapcar (Qcdr
, Vprocess_alist
);
937 /* Starting asynchronous inferior processes. */
939 static Lisp_Object
start_process_unwind ();
941 DEFUN ("start-process", Fstart_process
, Sstart_process
, 3, MANY
, 0,
942 "Start a program in a subprocess. Return the process object for it.\n\
943 Args are NAME BUFFER PROGRAM &rest PROGRAM-ARGS\n\
944 NAME is name for process. It is modified if necessary to make it unique.\n\
945 BUFFER is the buffer or (buffer-name) to associate with the process.\n\
946 Process output goes at end of that buffer, unless you specify\n\
947 an output stream or filter function to handle the output.\n\
948 BUFFER may be also nil, meaning that this process is not associated\n\
950 Third arg is program file name. It is searched for as in the shell.\n\
951 Remaining arguments are strings to give program as arguments.")
954 register Lisp_Object
*args
;
956 Lisp_Object buffer
, name
, program
, proc
, current_dir
, tem
;
958 register unsigned char *new_argv
;
961 register unsigned char **new_argv
;
964 int count
= specpdl_ptr
- specpdl
;
968 buffer
= Fget_buffer_create (buffer
);
970 /* Make sure that the child will be able to chdir to the current
971 buffer's current directory, or its unhandled equivalent. We
972 can't just have the child check for an error when it does the
973 chdir, since it's in a vfork.
975 We have to GCPRO around this because Fexpand_file_name and
976 Funhandled_file_name_directory might call a file name handling
977 function. The argument list is protected by the caller, so all
978 we really have to worry about is buffer. */
980 struct gcpro gcpro1
, gcpro2
;
982 current_dir
= current_buffer
->directory
;
984 GCPRO2 (buffer
, current_dir
);
987 expand_and_dir_to_file
988 (Funhandled_file_name_directory (current_dir
), Qnil
);
989 if (NILP (Ffile_accessible_directory_p (current_dir
)))
990 report_file_error ("Setting current directory",
991 Fcons (current_buffer
->directory
, Qnil
));
997 CHECK_STRING (name
, 0);
1001 CHECK_STRING (program
, 2);
1004 /* Make a one member argv with all args concatenated
1005 together separated by a blank. */
1006 len
= XSTRING (program
)->size
+ 2;
1007 for (i
= 3; i
< nargs
; i
++)
1010 CHECK_STRING (tem
, i
);
1011 len
+= XSTRING (tem
)->size
+ 1; /* count the blank */
1013 new_argv
= (unsigned char *) alloca (len
);
1014 strcpy (new_argv
, XSTRING (program
)->data
);
1015 for (i
= 3; i
< nargs
; i
++)
1018 CHECK_STRING (tem
, i
);
1019 strcat (new_argv
, " ");
1020 strcat (new_argv
, XSTRING (tem
)->data
);
1022 /* Need to add code here to check for program existence on VMS */
1025 new_argv
= (unsigned char **) alloca ((nargs
- 1) * sizeof (char *));
1027 for (i
= 3; i
< nargs
; i
++)
1030 CHECK_STRING (tem
, i
);
1031 new_argv
[i
- 2] = XSTRING (tem
)->data
;
1033 new_argv
[i
- 2] = 0;
1034 new_argv
[0] = XSTRING (program
)->data
;
1036 /* If program file name is not absolute, search our path for it */
1037 if (new_argv
[0][0] != '/')
1040 openp (Vexec_path
, program
, EXEC_SUFFIXES
, &tem
, 1);
1042 report_file_error ("Searching for program", Fcons (program
, Qnil
));
1043 new_argv
[0] = XSTRING (tem
)->data
;
1045 #endif /* not VMS */
1047 proc
= make_process (name
);
1048 /* If an error occurs and we can't start the process, we want to
1049 remove it from the process list. This means that each error
1050 check in create_process doesn't need to call remove_process
1051 itself; it's all taken care of here. */
1052 record_unwind_protect (start_process_unwind
, proc
);
1054 XPROCESS (proc
)->childp
= Qt
;
1055 XPROCESS (proc
)->command_channel_p
= Qnil
;
1056 XPROCESS (proc
)->buffer
= buffer
;
1057 XPROCESS (proc
)->sentinel
= Qnil
;
1058 XPROCESS (proc
)->filter
= Qnil
;
1059 XPROCESS (proc
)->command
= Flist (nargs
- 2, args
+ 2);
1061 create_process (proc
, new_argv
, current_dir
);
1063 return unbind_to (count
, proc
);
1066 /* This function is the unwind_protect form for Fstart_process. If
1067 PROC doesn't have its pid set, then we know someone has signalled
1068 an error and the process wasn't started successfully, so we should
1069 remove it from the process list. */
1071 start_process_unwind (proc
)
1074 if (XTYPE (proc
) != Lisp_Process
)
1077 /* Was PROC started successfully? */
1078 if (XINT (XPROCESS (proc
)->pid
) <= 0)
1079 remove_process (proc
);
1086 create_process_1 (signo
)
1090 /* USG systems forget handlers when they are used;
1091 must reestablish each time */
1092 signal (signo
, create_process_1
);
1096 #if 0 /* This doesn't work; see the note before sigchld_handler. */
1099 /* Mimic blocking of signals on system V, which doesn't really have it. */
1101 /* Nonzero means we got a SIGCHLD when it was supposed to be blocked. */
1102 int sigchld_deferred
;
1105 create_process_sigchld ()
1107 signal (SIGCHLD
, create_process_sigchld
);
1109 sigchld_deferred
= 1;
1115 #ifndef VMS /* VMS version of this function is in vmsproc.c. */
1116 create_process (process
, new_argv
, current_dir
)
1117 Lisp_Object process
;
1119 Lisp_Object current_dir
;
1121 int pid
, inchannel
, outchannel
, forkin
, forkout
;
1124 SIGTYPE (*sigchld
)();
1127 extern char **environ
;
1129 inchannel
= outchannel
= -1;
1132 if (EQ (Vprocess_connection_type
, Qt
))
1133 outchannel
= inchannel
= allocate_pty ();
1138 /* On USG systems it does not work to open the pty's tty here
1139 and then close and reopen it in the child. */
1141 /* Don't let this terminal become our controlling terminal
1142 (in case we don't have one). */
1143 forkout
= forkin
= open (pty_name
, O_RDWR
| O_NOCTTY
, 0);
1145 forkout
= forkin
= open (pty_name
, O_RDWR
, 0);
1148 report_file_error ("Opening pty", Qnil
);
1150 forkin
= forkout
= -1;
1151 #endif /* not USG */
1155 #endif /* HAVE_PTYS */
1158 if (socketpair (AF_UNIX
, SOCK_STREAM
, 0, sv
) < 0)
1159 report_file_error ("Opening socketpair", Qnil
);
1160 outchannel
= inchannel
= sv
[0];
1161 forkout
= forkin
= sv
[1];
1163 #else /* not SKTPAIR */
1172 #endif /* not SKTPAIR */
1175 /* Replaced by close_process_descs */
1176 set_exclusive_use (inchannel
);
1177 set_exclusive_use (outchannel
);
1180 /* Stride people say it's a mystery why this is needed
1181 as well as the O_NDELAY, but that it fails without this. */
1182 #if defined (STRIDE) || (defined (pfa) && defined (HAVE_PTYS))
1185 ioctl (inchannel
, FIONBIO
, &one
);
1190 fcntl (inchannel
, F_SETFL
, O_NONBLOCK
);
1193 fcntl (inchannel
, F_SETFL
, O_NDELAY
);
1197 /* Record this as an active process, with its channels.
1198 As a result, child_setup will close Emacs's side of the pipes. */
1199 chan_process
[inchannel
] = process
;
1200 XSET (XPROCESS (process
)->infd
, Lisp_Int
, inchannel
);
1201 XSET (XPROCESS (process
)->outfd
, Lisp_Int
, outchannel
);
1202 /* Record the tty descriptor used in the subprocess. */
1204 XPROCESS (process
)->subtty
= Qnil
;
1206 XFASTINT (XPROCESS (process
)->subtty
) = forkin
;
1207 XPROCESS (process
)->pty_flag
= (pty_flag
? Qt
: Qnil
);
1208 XPROCESS (process
)->status
= Qrun
;
1210 /* Delay interrupts until we have a chance to store
1211 the new fork's pid in its process structure */
1215 #else /* not BSD4_1 */
1216 #if defined (BSD) || defined (UNIPLUS) || defined (HPUX)
1217 sigsetmask (sigmask (SIGCHLD
));
1218 #else /* ordinary USG */
1220 sigchld_deferred
= 0;
1221 sigchld
= signal (SIGCHLD
, create_process_sigchld
);
1223 #endif /* ordinary USG */
1224 #endif /* not BSD4_1 */
1225 #endif /* SIGCHLD */
1227 /* Until we store the proper pid, enable sigchld_handler
1228 to recognize an unknown pid as standing for this process.
1229 It is very important not to let this `marker' value stay
1230 in the table after this function has returned; if it does
1231 it might cause call-process to hang and subsequent asynchronous
1232 processes to get their return values scrambled. */
1233 XSETINT (XPROCESS (process
)->pid
, -1);
1236 /* child_setup must clobber environ on systems with true vfork.
1237 Protect it from permanent change. */
1238 char **save_environ
= environ
;
1243 int xforkin
= forkin
;
1244 int xforkout
= forkout
;
1246 #if 0 /* This was probably a mistake--it duplicates code later on,
1247 but fails to handle all the cases. */
1248 /* Make sure SIGCHLD is not blocked in the child. */
1249 sigsetmask (SIGEMPTYMASK
);
1252 /* Make the pty be the controlling terminal of the process. */
1254 /* First, disconnect its current controlling terminal. */
1258 /* Make the pty's terminal the controlling terminal. */
1260 /* We ignore the return value
1261 because faith@cs.unc.edu says that is necessary on Linux. */
1262 ioctl (xforkin
, TIOCSCTTY
, 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 */
1275 /* Use new line discipline. */
1276 int ldisc
= NTTYDISC
;
1277 if (ioctl (xforkin
, TIOCSETD
, &ldisc
) < 0)
1278 write (1, "create_process/TIOCSETD failed\n", 31);
1282 /* In 4.3BSD, the TIOCSPGRP bug has been fixed, and now you
1283 can do TIOCSPGRP only to the process's controlling tty. */
1286 /* I wonder: would just ioctl (0, TIOCNOTTY, 0) work here?
1287 I can't test it since I don't have 4.3. */
1288 int j
= open ("/dev/tty", O_RDWR
, 0);
1289 ioctl (j
, TIOCNOTTY
, 0);
1292 /* In order to get a controlling terminal on some versions
1293 of BSD, it is necessary to put the process in pgrp 0
1294 before it opens the terminal. */
1298 #endif /* TIOCNOTTY */
1300 #if !defined (RTU) && !defined (UNIPLUS)
1301 /*** There is a suggestion that this ought to be a
1302 conditional on TIOCSPGRP. */
1303 /* Now close the pty (if we had it open) and reopen it.
1304 This makes the pty the controlling terminal of the subprocess. */
1307 #ifdef SET_CHILD_PTY_PGRP
1308 int pgrp
= getpid ();
1311 /* I wonder if close (open (pty_name, ...)) would work? */
1314 xforkout
= xforkin
= open (pty_name
, O_RDWR
, 0);
1316 #ifdef SET_CHILD_PTY_PGRP
1317 ioctl (xforkin
, TIOCSPGRP
, &pgrp
);
1318 ioctl (xforkout
, TIOCSPGRP
, &pgrp
);
1324 #endif /* not UNIPLUS and not RTU */
1325 #ifdef SETUP_SLAVE_PTY
1327 #endif /* SETUP_SLAVE_PTY */
1329 /* On AIX, we've disabled SIGHUP above once we start a child on a pty.
1330 Now reenable it in the child, so it will die when we want it to. */
1332 signal (SIGHUP
, SIG_DFL
);
1334 #endif /* HAVE_PTYS */
1339 #else /* not BSD4_1 */
1340 #if defined (BSD) || defined (UNIPLUS) || defined (HPUX)
1341 sigsetmask (SIGEMPTYMASK
);
1342 #else /* ordinary USG */
1344 signal (SIGCHLD
, sigchld
);
1346 #endif /* ordinary USG */
1347 #endif /* not BSD4_1 */
1348 #endif /* SIGCHLD */
1350 child_setup_tty (xforkout
);
1351 child_setup (xforkin
, xforkout
, xforkout
,
1352 new_argv
, 1, current_dir
);
1354 environ
= save_environ
;
1358 report_file_error ("Doing vfork", Qnil
);
1360 XFASTINT (XPROCESS (process
)->pid
) = pid
;
1362 FD_SET (inchannel
, &input_wait_mask
);
1364 /* If the subfork execv fails, and it exits,
1365 this close hangs. I don't know why.
1366 So have an interrupt jar it loose. */
1368 signal (SIGALRM
, create_process_1
);
1370 XPROCESS (process
)->subtty
= Qnil
;
1375 if (forkin
!= forkout
&& forkout
>= 0)
1381 #else /* not BSD4_1 */
1382 #if defined (BSD) || defined (UNIPLUS) || defined (HPUX)
1383 sigsetmask (SIGEMPTYMASK
);
1384 #else /* ordinary USG */
1386 signal (SIGCHLD
, sigchld
);
1387 /* Now really handle any of these signals
1388 that came in during this function. */
1389 if (sigchld_deferred
)
1390 kill (getpid (), SIGCHLD
);
1392 #endif /* ordinary USG */
1393 #endif /* not BSD4_1 */
1394 #endif /* SIGCHLD */
1396 #endif /* not VMS */
1400 /* open a TCP network connection to a given HOST/SERVICE. Treated
1401 exactly like a normal process when reading and writing. Only
1402 differences are in status display and process deletion. A network
1403 connection has no PID; you cannot signal it. All you can do is
1404 deactivate and close it via delete-process */
1406 DEFUN ("open-network-stream", Fopen_network_stream
, Sopen_network_stream
,
1408 "Open a TCP connection for a service to a host.\n\
1409 Returns a subprocess-object to represent the connection.\n\
1410 Input and output work as for subprocesses; `delete-process' closes it.\n\
1411 Args are NAME BUFFER HOST SERVICE.\n\
1412 NAME is name for process. It is modified if necessary to make it unique.\n\
1413 BUFFER is the buffer (or buffer-name) to associate with the process.\n\
1414 Process output goes at end of that buffer, unless you specify\n\
1415 an output stream or filter function to handle the output.\n\
1416 BUFFER may be also nil, meaning that this process is not associated\n\
1418 Third arg is name of the host to connect to, or its IP address.\n\
1419 Fourth arg SERVICE is name of the service desired, or an integer\n\
1420 specifying a port number to connect to.")
1421 (name
, buffer
, host
, service
)
1422 Lisp_Object name
, buffer
, host
, service
;
1426 struct sockaddr_in address
;
1427 struct servent
*svc_info
;
1428 struct hostent
*host_info_ptr
, host_info
;
1429 char *(addr_list
[2]);
1430 IN_ADDR numeric_addr
;
1434 struct hostent host_info_fixed
;
1435 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
;
1437 GCPRO4 (name
, buffer
, host
, service
);
1438 CHECK_STRING (name
, 0);
1439 CHECK_STRING (host
, 0);
1440 if (XTYPE(service
) == Lisp_Int
)
1441 port
= htons ((unsigned short) XINT (service
));
1444 CHECK_STRING (service
, 0);
1445 svc_info
= getservbyname (XSTRING (service
)->data
, "tcp");
1447 error ("Unknown service \"%s\"", XSTRING (service
)->data
);
1448 port
= svc_info
->s_port
;
1452 host_info_ptr
= gethostbyname (XSTRING (host
)->data
);
1453 if (host_info_ptr
== 0)
1454 /* Attempt to interpret host as numeric inet address */
1456 numeric_addr
= inet_addr ((char *) XSTRING (host
)->data
);
1457 if (NUMERIC_ADDR_ERROR
)
1458 error ("Unknown host \"%s\"", XSTRING (host
)->data
);
1460 host_info_ptr
= &host_info
;
1461 host_info
.h_name
= 0;
1462 host_info
.h_aliases
= 0;
1463 host_info
.h_addrtype
= AF_INET
;
1465 /* Older machines have only one address slot called h_addr.
1466 Newer machines have h_addr_list, but #define h_addr to
1467 be its first element. */
1468 host_info
.h_addr_list
= &(addr_list
[0]);
1470 host_info
.h_addr
= (char*)(&numeric_addr
);
1472 host_info
.h_length
= strlen (addr_list
[0]);
1475 bzero (&address
, sizeof address
);
1476 bcopy (host_info_ptr
->h_addr
, (char *) &address
.sin_addr
,
1477 host_info_ptr
->h_length
);
1478 address
.sin_family
= host_info_ptr
->h_addrtype
;
1479 address
.sin_port
= port
;
1481 s
= socket (host_info_ptr
->h_addrtype
, SOCK_STREAM
, 0);
1483 report_file_error ("error creating socket", Fcons (name
, Qnil
));
1485 /* Kernel bugs (on Ultrix at least) cause lossage (not just EINTR)
1486 when connect is interrupted. So let's not let it get interrupted.
1487 Note we do not turn off polling, because polling is only used
1488 when not interrupt_input, and thus not normally used on the systems
1489 which have this bug. On systems which use polling, there's no way
1490 to quit if polling is turned off. */
1491 if (interrupt_input
)
1495 if (connect (s
, (struct sockaddr
*) &address
, sizeof address
) == -1)
1502 if (interrupt_input
)
1506 report_file_error ("connection failed",
1507 Fcons (host
, Fcons (name
, Qnil
)));
1510 if (interrupt_input
)
1514 s
= connect_server (0);
1516 report_file_error ("error creating socket", Fcons (name
, Qnil
));
1517 send_command (s
, C_PORT
, 0, "%s:%d", XSTRING (host
)->data
, ntohs (port
));
1518 send_command (s
, C_DUMB
, 1, 0);
1524 report_file_error ("error duplicating socket", Fcons (name
, Qnil
));
1527 buffer
= Fget_buffer_create (buffer
);
1528 proc
= make_process (name
);
1530 chan_process
[inch
] = proc
;
1533 fcntl (inch
, F_SETFL
, O_NONBLOCK
);
1536 fcntl (inch
, F_SETFL
, O_NDELAY
);
1540 XPROCESS (proc
)->childp
= host
;
1541 XPROCESS (proc
)->command_channel_p
= Qnil
;
1542 XPROCESS (proc
)->buffer
= buffer
;
1543 XPROCESS (proc
)->sentinel
= Qnil
;
1544 XPROCESS (proc
)->filter
= Qnil
;
1545 XPROCESS (proc
)->command
= Qnil
;
1546 XPROCESS (proc
)->pid
= Qnil
;
1547 XSET (XPROCESS (proc
)->infd
, Lisp_Int
, s
);
1548 XSET (XPROCESS (proc
)->outfd
, Lisp_Int
, outch
);
1549 XPROCESS (proc
)->status
= Qrun
;
1550 FD_SET (inch
, &input_wait_mask
);
1555 #endif /* HAVE_SOCKETS */
1557 deactivate_process (proc
)
1560 register int inchannel
, outchannel
;
1561 register struct Lisp_Process
*p
= XPROCESS (proc
);
1563 inchannel
= XINT (p
->infd
);
1564 outchannel
= XINT (p
->outfd
);
1568 /* Beware SIGCHLD hereabouts. */
1569 flush_pending_output (inchannel
);
1572 VMS_PROC_STUFF
*get_vms_process_pointer (), *vs
;
1573 sys$
dassgn (outchannel
);
1574 vs
= get_vms_process_pointer (p
->pid
);
1576 give_back_vms_process_stuff (vs
);
1580 if (outchannel
>= 0 && outchannel
!= inchannel
)
1584 XSET (p
->infd
, Lisp_Int
, -1);
1585 XSET (p
->outfd
, Lisp_Int
, -1);
1586 chan_process
[inchannel
] = Qnil
;
1587 FD_CLR (inchannel
, &input_wait_mask
);
1591 /* Close all descriptors currently in use for communication
1592 with subprocess. This is used in a newly-forked subprocess
1593 to get rid of irrelevant descriptors. */
1595 close_process_descs ()
1598 for (i
= 0; i
< MAXDESC
; i
++)
1600 Lisp_Object process
;
1601 process
= chan_process
[i
];
1602 if (!NILP (process
))
1604 int in
= XINT (XPROCESS (process
)->infd
);
1605 int out
= XINT (XPROCESS (process
)->outfd
);
1608 if (out
>= 0 && in
!= out
)
1614 DEFUN ("accept-process-output", Faccept_process_output
, Saccept_process_output
,
1616 "Allow any pending output from subprocesses to be read by Emacs.\n\
1617 It is read into the process' buffers or given to their filter functions.\n\
1618 Non-nil arg PROCESS means do not return until some output has been received\n\
1620 Non-nil second arg TIMEOUT and third arg TIMEOUT-MSECS are number of\n\
1621 seconds and microseconds to wait; return after that much time whether\n\
1622 or not there is input.\n\
1623 Return non-nil iff we received any output before the timeout expired.")
1624 (proc
, timeout
, timeout_msecs
)
1625 register Lisp_Object proc
, timeout
, timeout_msecs
;
1630 if (! NILP (timeout_msecs
))
1632 CHECK_NUMBER (timeout_msecs
, 2);
1633 useconds
= XINT (timeout_msecs
);
1634 if (XTYPE (timeout
) != Lisp_Int
)
1635 XSET (timeout
, Lisp_Int
, 0);
1638 int carry
= useconds
/ 1000000;
1640 XSETINT (timeout
, XINT (timeout
) + carry
);
1641 useconds
-= carry
* 1000000;
1643 /* I think this clause is necessary because C doesn't
1644 guarantee a particular rounding direction for negative
1648 XSETINT (timeout
, XINT (timeout
) - 1);
1649 useconds
+= 1000000;
1656 if (! NILP (timeout
))
1658 CHECK_NUMBER (timeout
, 1);
1659 seconds
= XINT (timeout
);
1672 XFASTINT (proc
) = 0;
1675 (wait_reading_process_input (seconds
, useconds
, proc
, 0)
1679 /* This variable is different from waiting_for_input in keyboard.c.
1680 It is used to communicate to a lisp process-filter/sentinel (via the
1681 function Fwaiting_for_user_input_p below) whether emacs was waiting
1682 for user-input when that process-filter was called.
1683 waiting_for_input cannot be used as that is by definition 0 when
1684 lisp code is being evalled */
1685 static int waiting_for_user_input_p
;
1687 /* Read and dispose of subprocess output while waiting for timeout to
1688 elapse and/or keyboard input to be available.
1691 timeout in seconds, or
1692 zero for no limit, or
1693 -1 means gobble data immediately available but don't wait for any.
1696 an additional duration to wait, measured in microseconds.
1697 If this is nonzero and time_limit is 0, then the timeout
1698 consists of MICROSECS only.
1700 READ_KBD is a lisp value:
1701 0 to ignore keyboard input, or
1702 1 to return when input is available, or
1703 -1 meaning caller will actually read the input, so don't throw to
1704 the quit handler, or
1705 a cons cell, meaning wait wait until its car is non-nil
1706 (and gobble terminal input into the buffer if any arrives), or
1707 a process object, meaning wait until something arrives from that
1708 process. The return value is true iff we read some input from
1711 DO_DISPLAY != 0 means redisplay should be done to show subprocess
1712 output that arrives.
1714 If READ_KBD is a pointer to a struct Lisp_Process, then the
1715 function returns true iff we received input from that process
1716 before the timeout elapsed.
1717 Otherwise, return true iff we received input from any process. */
1719 wait_reading_process_input (time_limit
, microsecs
, read_kbd
, do_display
)
1720 int time_limit
, microsecs
;
1721 Lisp_Object read_kbd
;
1724 register int channel
, nfds
, m
;
1725 static SELECT_TYPE Available
;
1728 EMACS_TIME timeout
, end_time
, garbage
;
1730 int wait_channel
= -1;
1731 struct Lisp_Process
*wait_proc
= 0;
1732 int got_some_input
= 0;
1733 Lisp_Object
*wait_for_cell
= 0;
1735 FD_ZERO (&Available
);
1737 /* If read_kbd is a process to watch, set wait_proc and wait_channel
1739 if (XTYPE (read_kbd
) == Lisp_Process
)
1741 wait_proc
= XPROCESS (read_kbd
);
1742 wait_channel
= XINT (wait_proc
->infd
);
1743 XFASTINT (read_kbd
) = 0;
1746 /* If waiting for non-nil in a cell, record where. */
1747 if (XTYPE (read_kbd
) == Lisp_Cons
)
1749 wait_for_cell
= &XCONS (read_kbd
)->car
;
1750 XFASTINT (read_kbd
) = 0;
1753 waiting_for_user_input_p
= XINT (read_kbd
);
1755 /* Since we may need to wait several times,
1756 compute the absolute time to return at. */
1757 if (time_limit
|| microsecs
)
1759 EMACS_GET_TIME (end_time
);
1760 EMACS_SET_SECS_USECS (timeout
, time_limit
, microsecs
);
1761 EMACS_ADD_TIME (end_time
, end_time
, timeout
);
1764 /* It would not be safe to call this below,
1765 where we call redisplay_preserve_echo_area. */
1766 prepare_menu_bars ();
1770 /* If calling from keyboard input, do not quit
1771 since we want to return C-g as an input character.
1772 Otherwise, do pending quit if requested. */
1773 if (XINT (read_kbd
) >= 0)
1776 /* Exit now if the cell we're waiting for became non-nil. */
1777 if (wait_for_cell
&& ! NILP (*wait_for_cell
))
1780 /* Compute time from now till when time limit is up */
1781 /* Exit if already run out */
1782 if (time_limit
== -1)
1784 /* -1 specified for timeout means
1785 gobble output available now
1786 but don't wait at all. */
1788 EMACS_SET_SECS_USECS (timeout
, 0, 0);
1790 else if (time_limit
|| microsecs
)
1792 EMACS_GET_TIME (timeout
);
1793 EMACS_SUB_TIME (timeout
, end_time
, timeout
);
1794 if (EMACS_TIME_NEG_P (timeout
))
1799 EMACS_SET_SECS_USECS (timeout
, 100000, 0);
1802 /* Cause C-g and alarm signals to take immediate action,
1803 and cause input available signals to zero out timeout.
1805 It is important that we do this before checking for process
1806 activity. If we get a SIGCHLD after the explicit checks for
1807 process activity, timeout is the only way we will know. */
1808 if (XINT (read_kbd
) < 0)
1809 set_waiting_for_input (&timeout
);
1811 /* If status of something has changed, and no input is
1812 available, notify the user of the change right away. After
1813 this explicit check, we'll let the SIGCHLD handler zap
1814 timeout to get our attention. */
1815 if (update_tick
!= process_tick
&& do_display
)
1817 Atemp
= input_wait_mask
;
1818 EMACS_SET_SECS_USECS (timeout
, 0, 0);
1819 if (select (MAXDESC
, &Atemp
, 0, 0, &timeout
) <= 0)
1821 /* It's okay for us to do this and then continue with
1822 the loop, since timeout has already been zeroed out. */
1823 clear_waiting_for_input ();
1828 /* Don't wait for output from a non-running process. */
1829 if (wait_proc
!= 0 && !NILP (wait_proc
->raw_status_low
))
1830 update_status (wait_proc
);
1832 && ! EQ (wait_proc
->status
, Qrun
))
1834 clear_waiting_for_input ();
1838 /* Wait till there is something to do */
1840 Available
= input_wait_mask
;
1841 /* We used to have && wait_for_cell == 0
1842 but that led to lossage handling selection_request events:
1843 within one, we would start to handle another. */
1844 if (! XINT (read_kbd
))
1845 FD_CLR (keyboard_descriptor
, &Available
);
1847 /* If frame size has changed or the window is newly mapped,
1848 redisplay now, before we start to wait. There is a race
1849 condition here; if a SIGIO arrives between now and the select
1850 and indicates that a frame is trashed, the select may block
1851 displaying a trashed screen. */
1853 redisplay_preserve_echo_area ();
1855 if (XINT (read_kbd
) && detect_input_pending ())
1858 FD_ZERO (&Available
);
1861 nfds
= select (MAXDESC
, &Available
, 0, 0, &timeout
);
1865 /* Make C-g and alarm signals set flags again */
1866 clear_waiting_for_input ();
1868 /* If we woke up due to SIGWINCH, actually change size now. */
1869 do_pending_window_change ();
1871 if (time_limit
&& nfds
== 0) /* timeout elapsed */
1875 if (xerrno
== EINTR
)
1876 FD_ZERO (&Available
);
1878 /* Ultrix select seems to return ENOMEM when it is
1879 interrupted. Treat it just like EINTR. Bleah. Note
1880 that we want to test for the "ultrix" CPP symbol, not
1881 "__ultrix__"; the latter is only defined under GCC, but
1882 not by DEC's bundled CC. -JimB */
1883 else if (xerrno
== ENOMEM
)
1884 FD_ZERO (&Available
);
1887 /* This happens for no known reason on ALLIANT.
1888 I am guessing that this is the right response. -- RMS. */
1889 else if (xerrno
== EFAULT
)
1890 FD_ZERO (&Available
);
1892 else if (xerrno
== EBADF
)
1895 /* AIX doesn't handle PTY closure the same way BSD does. On AIX,
1896 the child's closure of the pts gives the parent a SIGHUP, and
1897 the ptc file descriptor is automatically closed,
1898 yielding EBADF here or at select() call above.
1899 So, SIGHUP is ignored (see def of PTY_TTY_NAME_SPRINTF
1900 in m/ibmrt-aix.h), and here we just ignore the select error.
1901 Cleanup occurs c/o status_notify after SIGCLD. */
1902 FD_ZERO (&Available
); /* Cannot depend on values returned */
1908 error("select error: %s", strerror (xerrno
));
1910 #if defined(sun) && !defined(USG5_4)
1911 else if (nfds
> 0 && FD_ISSET (keyboard_descriptor
, &Available
)
1913 /* System sometimes fails to deliver SIGIO.
1915 David J. Mackenzie says that Emacs doesn't compile under
1916 Solaris if this code is enabled, thus the USG5_4 in the CPP
1917 conditional. "I haven't noticed any ill effects so far.
1918 If you find a Solaris expert somewhere, they might know
1920 kill (getpid (), SIGIO
);
1923 /* Check for keyboard input */
1924 /* If there is any, return immediately
1925 to give it higher priority than subprocesses */
1927 /* We used to do his if wait_for_cell,
1928 but that caused infinite recursion in selection request events. */
1929 if ((XINT (read_kbd
))
1930 && detect_input_pending ())
1933 if (detect_input_pending ())
1937 /* Exit now if the cell we're waiting for became non-nil. */
1938 if (wait_for_cell
&& ! NILP (*wait_for_cell
))
1942 /* If we think we have keyboard input waiting, but didn't get SIGIO
1943 go read it. This can happen with X on BSD after logging out.
1944 In that case, there really is no input and no SIGIO,
1945 but select says there is input. */
1947 if (XINT (read_kbd
) && interrupt_input
1948 && (FD_ISSET (keyboard_descriptor
, &Available
)))
1953 got_some_input
|= nfds
> 0;
1955 /* If checking input just got us a size-change event from X,
1956 obey it now if we should. */
1957 if (XINT (read_kbd
) || wait_for_cell
)
1958 do_pending_window_change ();
1960 /* Check for data from a process. */
1961 /* Really FIRST_PROC_DESC should be 0 on Unix,
1962 but this is safer in the short run. */
1963 for (channel
= keyboard_descriptor
== 0 ? FIRST_PROC_DESC
: 0;
1964 channel
< MAXDESC
; channel
++)
1966 if (FD_ISSET (channel
, &Available
))
1970 /* If waiting for this channel, arrange to return as
1971 soon as no more input to be processed. No more
1973 if (wait_channel
== channel
)
1979 proc
= chan_process
[channel
];
1983 /* Read data from the process, starting with our
1984 buffered-ahead character if we have one. */
1986 nread
= read_process_output (proc
, channel
);
1989 /* Since read_process_output can run a filter,
1990 which can call accept-process-output,
1991 don't try to read from any other processes
1992 before doing the select again. */
1993 FD_ZERO (&Available
);
1996 redisplay_preserve_echo_area ();
1999 else if (nread
== -1 && errno
== EWOULDBLOCK
)
2003 else if (nread
== -1 && errno
== EAGAIN
)
2007 else if (nread
== -1 && errno
== EAGAIN
)
2009 /* Note that we cannot distinguish between no input
2010 available now and a closed pipe.
2011 With luck, a closed pipe will be accompanied by
2012 subprocess termination and SIGCHLD. */
2013 else if (nread
== 0 && !NETCONN_P (proc
))
2015 #endif /* O_NDELAY */
2016 #endif /* O_NONBLOCK */
2017 #endif /* EWOULDBLOCK */
2019 /* On some OSs with ptys, when the process on one end of
2020 a pty exits, the other end gets an error reading with
2021 errno = EIO instead of getting an EOF (0 bytes read).
2022 Therefore, if we get an error reading and errno =
2023 EIO, just continue, because the child process has
2024 exited and should clean itself up soon (e.g. when we
2026 else if (nread
== -1 && errno
== EIO
)
2028 #endif /* HAVE_PTYS */
2029 /* If we can detect process termination, don't consider the process
2030 gone just because its pipe is closed. */
2032 else if (nread
== 0 && !NETCONN_P (proc
))
2037 /* Preserve status of processes already terminated. */
2038 XSETINT (XPROCESS (proc
)->tick
, ++process_tick
);
2039 deactivate_process (proc
);
2040 if (!NILP (XPROCESS (proc
)->raw_status_low
))
2041 update_status (XPROCESS (proc
));
2042 if (EQ (XPROCESS (proc
)->status
, Qrun
))
2043 XPROCESS (proc
)->status
2044 = Fcons (Qexit
, Fcons (make_number (256), Qnil
));
2047 } /* end for each file descriptor */
2048 } /* end while exit conditions not met */
2050 /* If calling from keyboard input, do not quit
2051 since we want to return C-g as an input character.
2052 Otherwise, do pending quit if requested. */
2053 if (XINT (read_kbd
) >= 0)
2055 /* Prevent input_pending from remaining set if we quit. */
2056 clear_input_pending ();
2060 return got_some_input
;
2063 /* Read pending output from the process channel,
2064 starting with our buffered-ahead character if we have one.
2065 Yield number of characters read.
2067 This function reads at most 1024 characters.
2068 If you want to read all available subprocess output,
2069 you must call it repeatedly until it returns zero. */
2071 read_process_output (proc
, channel
)
2073 register int channel
;
2075 register int nchars
;
2081 register Lisp_Object outstream
;
2082 register struct buffer
*old
= current_buffer
;
2083 register struct Lisp_Process
*p
= XPROCESS (proc
);
2084 register int opoint
;
2087 VMS_PROC_STUFF
*vs
, *get_vms_process_pointer();
2089 vs
= get_vms_process_pointer (p
->pid
);
2093 return(0); /* Really weird if it does this */
2094 if (!(vs
->iosb
[0] & 1))
2095 return -1; /* I/O error */
2098 error ("Could not get VMS process pointer");
2099 chars
= vs
->inputBuffer
;
2100 nchars
= clean_vms_buffer (chars
, vs
->iosb
[1]);
2103 start_vms_process_read (vs
); /* Crank up the next read on the process */
2104 return 1; /* Nothing worth printing, say we got 1 */
2108 if (proc_buffered_char
[channel
] < 0)
2109 nchars
= read (channel
, chars
, sizeof chars
);
2112 chars
[0] = proc_buffered_char
[channel
];
2113 proc_buffered_char
[channel
] = -1;
2114 nchars
= read (channel
, chars
+ 1, sizeof chars
- 1);
2118 nchars
= nchars
+ 1;
2120 #endif /* not VMS */
2122 if (nchars
<= 0) return nchars
;
2124 outstream
= p
->filter
;
2125 if (!NILP (outstream
))
2127 /* We inhibit quit here instead of just catching it so that
2128 hitting ^G when a filter happens to be running won't screw
2130 int count
= specpdl_ptr
- specpdl
;
2131 Lisp_Object odeactivate
;
2133 odeactivate
= Vdeactivate_mark
;
2135 specbind (Qinhibit_quit
, Qt
);
2136 call2 (outstream
, proc
, make_string (chars
, nchars
));
2138 /* Handling the process output should not deactivate the mark. */
2139 Vdeactivate_mark
= odeactivate
;
2142 start_vms_process_read (vs
);
2144 unbind_to (count
, Qnil
);
2148 /* If no filter, write into buffer if it isn't dead. */
2149 if (!NILP (p
->buffer
) && !NILP (XBUFFER (p
->buffer
)->name
))
2151 Lisp_Object old_read_only
;
2152 Lisp_Object old_begv
, old_zv
;
2153 Lisp_Object odeactivate
;
2155 odeactivate
= Vdeactivate_mark
;
2157 Fset_buffer (p
->buffer
);
2159 old_read_only
= current_buffer
->read_only
;
2160 XFASTINT (old_begv
) = BEGV
;
2161 XFASTINT (old_zv
) = ZV
;
2163 current_buffer
->read_only
= Qnil
;
2165 /* Insert new output into buffer
2166 at the current end-of-output marker,
2167 thus preserving logical ordering of input and output. */
2168 if (XMARKER (p
->mark
)->buffer
)
2169 SET_PT (clip_to_bounds (BEGV
, marker_position (p
->mark
), ZV
));
2173 /* If the output marker is outside of the visible region, save
2174 the restriction and widen. */
2175 if (! (BEGV
<= point
&& point
<= ZV
))
2178 /* Make sure opoint floats ahead of any new text, just as point
2180 if (point
<= opoint
)
2183 /* Insert after old_begv, but before old_zv. */
2184 if (point
< XFASTINT (old_begv
))
2185 XFASTINT (old_begv
) += nchars
;
2186 if (point
<= XFASTINT (old_zv
))
2187 XFASTINT (old_zv
) += nchars
;
2189 /* Insert before markers in case we are inserting where
2190 the buffer's mark is, and the user's next command is Meta-y. */
2191 insert_before_markers (chars
, nchars
);
2192 Fset_marker (p
->mark
, make_number (point
), p
->buffer
);
2194 update_mode_lines
++;
2196 /* If the restriction isn't what it should be, set it. */
2197 if (XFASTINT (old_begv
) != BEGV
|| XFASTINT (old_zv
) != ZV
)
2198 Fnarrow_to_region (old_begv
, old_zv
);
2200 /* Handling the process output should not deactivate the mark. */
2201 Vdeactivate_mark
= odeactivate
;
2203 current_buffer
->read_only
= old_read_only
;
2205 set_buffer_internal (old
);
2208 start_vms_process_read (vs
);
2213 DEFUN ("waiting-for-user-input-p", Fwaiting_for_user_input_p
, Swaiting_for_user_input_p
,
2215 "Returns non-NIL if emacs is waiting for input from the user.\n\
2216 This is intended for use by asynchronous process output filters and sentinels.")
2219 return ((waiting_for_user_input_p
) ? Qt
: Qnil
);
2222 /* Sending data to subprocess */
2224 jmp_buf send_process_frame
;
2227 send_process_trap ()
2233 longjmp (send_process_frame
, 1);
2236 send_process (proc
, buf
, len
)
2241 /* Don't use register vars; longjmp can lose them. */
2243 unsigned char *procname
= XSTRING (XPROCESS (proc
)->name
)->data
;
2247 struct Lisp_Process
*p
= XPROCESS (proc
);
2248 VMS_PROC_STUFF
*vs
, *get_vms_process_pointer();
2251 if (! NILP (XPROCESS (proc
)->raw_status_low
))
2252 update_status (XPROCESS (proc
));
2253 if (! EQ (XPROCESS (proc
)->status
, Qrun
))
2254 error ("Process %s not running", procname
);
2257 vs
= get_vms_process_pointer (p
->pid
);
2259 error ("Could not find this process: %x", p
->pid
);
2260 else if (write_to_vms_process (vs
, buf
, len
))
2263 if (!setjmp (send_process_frame
))
2267 SIGTYPE (*old_sigpipe
)();
2270 if (pty_max_bytes
== 0)
2272 #if defined (HAVE_FPATHCONF) && defined (_PC_MAX_CANON)
2273 pty_max_bytes
= fpathconf (XFASTINT (XPROCESS (proc
)->outfd
),
2276 pty_max_bytes
= 250;
2280 /* Don't send more than pty_max_bytes bytes at a time. */
2281 /* Subtract 1 to leave room for the EOF. */
2282 if (this >= pty_max_bytes
&& XPROCESS (proc
)->pty_flag
!= 0)
2283 this = pty_max_bytes
- 1;
2285 old_sigpipe
= (SIGTYPE (*) ()) signal (SIGPIPE
, send_process_trap
);
2286 rv
= write (XINT (XPROCESS (proc
)->outfd
), buf
, this);
2288 /* If we sent just part of the string, put in an EOF
2289 to force it through, before we send the rest. */
2291 Fprocess_send_eof (proc
);
2293 signal (SIGPIPE
, old_sigpipe
);
2298 || errno
== EWOULDBLOCK
2305 /* It would be nice to accept process output here,
2306 but that is difficult. For example, it could
2307 garbage what we are sending if that is from a buffer. */
2314 report_file_error ("writing to process", Fcons (proc
, Qnil
));
2318 /* Allow input from processes between bursts of sending.
2319 Otherwise things may get stopped up. */
2324 XFASTINT (zero
) = 0;
2325 wait_reading_process_input (-1, 0, zero
, 0);
2331 XPROCESS (proc
)->raw_status_low
= Qnil
;
2332 XPROCESS (proc
)->raw_status_high
= Qnil
;
2333 XPROCESS (proc
)->status
= Fcons (Qexit
, Fcons (make_number (256), Qnil
));
2334 XSETINT (XPROCESS (proc
)->tick
, ++process_tick
);
2335 deactivate_process (proc
);
2337 error ("Error writing to process %s; closed it", procname
);
2339 error ("SIGPIPE raised on process %s; closed it", procname
);
2344 DEFUN ("process-send-region", Fprocess_send_region
, Sprocess_send_region
,
2346 "Send current contents of region as input to PROCESS.\n\
2347 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
2348 nil, indicating the current buffer's process.\n\
2349 Called from program, takes three arguments, PROCESS, START and END.\n\
2350 If the region is more than 500 characters long,\n\
2351 it is sent in several bunches. This may happen even for shorter regions.\n\
2352 Output from processes can arrive in between bunches.")
2353 (process
, start
, end
)
2354 Lisp_Object process
, start
, end
;
2359 proc
= get_process (process
);
2360 validate_region (&start
, &end
);
2362 if (XINT (start
) < GPT
&& XINT (end
) > GPT
)
2365 start1
= XINT (start
);
2366 send_process (proc
, &FETCH_CHAR (start1
), XINT (end
) - XINT (start
));
2371 DEFUN ("process-send-string", Fprocess_send_string
, Sprocess_send_string
,
2373 "Send PROCESS the contents of STRING as input.\n\
2374 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
2375 nil, indicating the current buffer's process.\n\
2376 If STRING is more than 500 characters long,\n\
2377 it is sent in several bunches. This may happen even for shorter strings.\n\
2378 Output from processes can arrive in between bunches.")
2380 Lisp_Object process
, string
;
2383 CHECK_STRING (string
, 1);
2384 proc
= get_process (process
);
2385 send_process (proc
, XSTRING (string
)->data
, XSTRING (string
)->size
);
2389 /* send a signal number SIGNO to PROCESS.
2390 CURRENT_GROUP means send to the process group that currently owns
2391 the terminal being used to communicate with PROCESS.
2392 This is used for various commands in shell mode.
2393 If NOMSG is zero, insert signal-announcements into process's buffers
2396 If we can, we try to signal PROCESS by sending control characters
2397 down the pipe. This allows us to signal inferiors who have changed
2398 their uid, for which killpg would return an EPERM error. */
2401 process_send_signal (process
, signo
, current_group
, nomsg
)
2402 Lisp_Object process
;
2404 Lisp_Object current_group
;
2408 register struct Lisp_Process
*p
;
2412 proc
= get_process (process
);
2413 p
= XPROCESS (proc
);
2415 if (!EQ (p
->childp
, Qt
))
2416 error ("Process %s is not a subprocess",
2417 XSTRING (p
->name
)->data
);
2418 if (XINT (p
->infd
) < 0)
2419 error ("Process %s is not active",
2420 XSTRING (p
->name
)->data
);
2422 if (NILP (p
->pty_flag
))
2423 current_group
= Qnil
;
2425 /* If we are using pgrps, get a pgrp number and make it negative. */
2426 if (!NILP (current_group
))
2428 #ifdef SIGNALS_VIA_CHARACTERS
2429 /* If possible, send signals to the entire pgrp
2430 by sending an input character to it. */
2432 /* TERMIOS is the latest and bestest, and seems most likely to
2433 work. If the system has it, use it. */
2440 tcgetattr (XINT (p
->infd
), &t
);
2441 send_process (proc
, &t
.c_cc
[VINTR
], 1);
2445 tcgetattr (XINT (p
->infd
), &t
);
2446 send_process (proc
, &t
.c_cc
[VQUIT
], 1);
2450 tcgetattr (XINT (p
->infd
), &t
);
2451 #if defined (VSWTCH) && !defined (IRIX5)
2452 send_process (proc
, &t
.c_cc
[VSWTCH
], 1);
2454 send_process (proc
, &t
.c_cc
[VSUSP
], 1);
2459 #else /* ! HAVE_TERMIOS */
2461 /* On Berkeley descendants, the following IOCTL's retrieve the
2462 current control characters. */
2463 #if defined (TIOCGLTC) && defined (TIOCGETC)
2471 ioctl (XINT (p
->infd
), TIOCGETC
, &c
);
2472 send_process (proc
, &c
.t_intrc
, 1);
2475 ioctl (XINT (p
->infd
), TIOCGETC
, &c
);
2476 send_process (proc
, &c
.t_quitc
, 1);
2480 ioctl (XINT (p
->infd
), TIOCGLTC
, &lc
);
2481 send_process (proc
, &lc
.t_suspc
, 1);
2483 #endif /* ! defined (SIGTSTP) */
2486 #else /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
2488 /* On SYSV descendants, the TCGETA ioctl retrieves the current control
2495 ioctl (XINT (p
->infd
), TCGETA
, &t
);
2496 send_process (proc
, &t
.c_cc
[VINTR
], 1);
2499 ioctl (XINT (p
->infd
), TCGETA
, &t
);
2500 send_process (proc
, &t
.c_cc
[VQUIT
], 1);
2504 ioctl (XINT (p
->infd
), TCGETA
, &t
);
2505 send_process (proc
, &t
.c_cc
[VSWTCH
], 1);
2507 #endif /* ! defined (SIGTSTP) */
2509 #else /* ! defined (TCGETA) */
2510 Your configuration files are messed up
.
2511 /* If your system configuration files define SIGNALS_VIA_CHARACTERS,
2512 you'd better be using one of the alternatives above! */
2513 #endif /* ! defined (TCGETA) */
2514 #endif /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
2515 #endif /* ! defined HAVE_TERMIOS */
2516 #endif /* ! defined (SIGNALS_VIA_CHARACTERS) */
2519 /* Get the pgrp using the tty itself, if we have that.
2520 Otherwise, use the pty to get the pgrp.
2521 On pfa systems, saka@pfu.fujitsu.co.JP writes:
2522 "TIOCGPGRP symbol defined in sys/ioctl.h at E50.
2523 But, TIOCGPGRP does not work on E50 ;-P works fine on E60"
2524 His patch indicates that if TIOCGPGRP returns an error, then
2525 we should just assume that p->pid is also the process group id. */
2529 if (!NILP (p
->subtty
))
2530 err
= ioctl (XFASTINT (p
->subtty
), TIOCGPGRP
, &gid
);
2532 err
= ioctl (XINT (p
->infd
), TIOCGPGRP
, &gid
);
2536 gid
= - XFASTINT (p
->pid
);
2537 #endif /* ! defined (pfa) */
2543 #else /* ! defined (TIOCGPGRP ) */
2544 /* Can't select pgrps on this system, so we know that
2545 the child itself heads the pgrp. */
2546 gid
= - XFASTINT (p
->pid
);
2547 #endif /* ! defined (TIOCGPGRP ) */
2550 gid
= - XFASTINT (p
->pid
);
2556 p
->raw_status_low
= Qnil
;
2557 p
->raw_status_high
= Qnil
;
2559 XSETINT (p
->tick
, ++process_tick
);
2563 #endif /* ! defined (SIGCONT) */
2566 send_process (proc
, "\003", 1); /* ^C */
2571 send_process (proc
, "\031", 1); /* ^Y */
2576 sys$
forcex (&(XFASTINT (p
->pid
)), 0, 1);
2579 flush_pending_output (XINT (p
->infd
));
2583 /* If we don't have process groups, send the signal to the immediate
2584 subprocess. That isn't really right, but it's better than any
2585 obvious alternative. */
2588 kill (XFASTINT (p
->pid
), signo
);
2592 /* gid may be a pid, or minus a pgrp's number */
2594 if (!NILP (current_group
))
2595 ioctl (XINT (p
->infd
), TIOCSIGSEND
, signo
);
2598 gid
= - XFASTINT (p
->pid
);
2601 #else /* ! defined (TIOCSIGSEND) */
2602 EMACS_KILLPG (-gid
, signo
);
2603 #endif /* ! defined (TIOCSIGSEND) */
2606 DEFUN ("interrupt-process", Finterrupt_process
, Sinterrupt_process
, 0, 2, 0,
2607 "Interrupt process PROCESS. May be process or name of one.\n\
2608 PROCESS may be a process, a buffer, or the name of a process or buffer.\n\
2609 Nil or no arg means current buffer's process.\n\
2610 Second arg CURRENT-GROUP non-nil means send signal to\n\
2611 the current process-group of the process's controlling terminal\n\
2612 rather than to the process's own process group.\n\
2613 If the process is a shell, this means interrupt current subjob\n\
2614 rather than the shell.")
2615 (process
, current_group
)
2616 Lisp_Object process
, current_group
;
2618 process_send_signal (process
, SIGINT
, current_group
, 0);
2622 DEFUN ("kill-process", Fkill_process
, Skill_process
, 0, 2, 0,
2623 "Kill process PROCESS. May be process or name of one.\n\
2624 See function `interrupt-process' for more details on usage.")
2625 (process
, current_group
)
2626 Lisp_Object process
, current_group
;
2628 process_send_signal (process
, SIGKILL
, current_group
, 0);
2632 DEFUN ("quit-process", Fquit_process
, Squit_process
, 0, 2, 0,
2633 "Send QUIT signal to process PROCESS. May be process or name of one.\n\
2634 See function `interrupt-process' for more details on usage.")
2635 (process
, current_group
)
2636 Lisp_Object process
, current_group
;
2638 process_send_signal (process
, SIGQUIT
, current_group
, 0);
2642 DEFUN ("stop-process", Fstop_process
, Sstop_process
, 0, 2, 0,
2643 "Stop process PROCESS. May be process or name of one.\n\
2644 See function `interrupt-process' for more details on usage.")
2645 (process
, current_group
)
2646 Lisp_Object process
, current_group
;
2649 error ("no SIGTSTP support");
2651 process_send_signal (process
, SIGTSTP
, current_group
, 0);
2656 DEFUN ("continue-process", Fcontinue_process
, Scontinue_process
, 0, 2, 0,
2657 "Continue process PROCESS. May be process or name of one.\n\
2658 See function `interrupt-process' for more details on usage.")
2659 (process
, current_group
)
2660 Lisp_Object process
, current_group
;
2663 process_send_signal (process
, SIGCONT
, current_group
, 0);
2665 error ("no SIGCONT support");
2670 DEFUN ("signal-process", Fsignal_process
, Ssignal_process
,
2671 2, 2, "nProcess number: \nnSignal code: ",
2672 "Send the process with number PID the signal with code CODE.\n\
2673 Both PID and CODE are integers.")
2675 Lisp_Object pid
, sig
;
2677 CHECK_NUMBER (pid
, 0);
2678 CHECK_NUMBER (sig
, 1);
2679 return make_number (kill (XINT (pid
), XINT (sig
)));
2682 DEFUN ("process-send-eof", Fprocess_send_eof
, Sprocess_send_eof
, 0, 1, 0,
2683 "Make PROCESS see end-of-file in its input.\n\
2684 Eof comes after any text already sent to it.\n\
2685 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
2686 nil, indicating the current buffer's process.")
2688 Lisp_Object process
;
2692 proc
= get_process (process
);
2694 /* Make sure the process is really alive. */
2695 if (! NILP (XPROCESS (proc
)->raw_status_low
))
2696 update_status (XPROCESS (proc
));
2697 if (! EQ (XPROCESS (proc
)->status
, Qrun
))
2698 error ("Process %s not running", XSTRING (XPROCESS (proc
)->name
)->data
);
2700 /* Sending a zero-length record is supposed to mean eof
2701 when TIOCREMOTE is turned on. */
2705 write (XINT (XPROCESS (proc
)->outfd
), buf
, 0);
2707 #else /* did not do TOICREMOTE */
2709 send_process (proc
, "\032", 1); /* ^z */
2711 if (!NILP (XPROCESS (proc
)->pty_flag
))
2712 send_process (proc
, "\004", 1);
2715 close (XINT (XPROCESS (proc
)->outfd
));
2716 XSET (XPROCESS (proc
)->outfd
, Lisp_Int
, open (NULL_DEVICE
, O_WRONLY
));
2719 #endif /* did not do TOICREMOTE */
2723 /* Kill all processes associated with `buffer'.
2724 If `buffer' is nil, kill all processes */
2726 kill_buffer_processes (buffer
)
2729 Lisp_Object tail
, proc
;
2731 for (tail
= Vprocess_alist
; XGCTYPE (tail
) == Lisp_Cons
;
2732 tail
= XCONS (tail
)->cdr
)
2734 proc
= XCONS (XCONS (tail
)->car
)->cdr
;
2735 if (XGCTYPE (proc
) == Lisp_Process
2736 && (NILP (buffer
) || EQ (XPROCESS (proc
)->buffer
, buffer
)))
2738 if (NETCONN_P (proc
))
2739 deactivate_process (proc
);
2740 else if (XINT (XPROCESS (proc
)->infd
) >= 0)
2741 process_send_signal (proc
, SIGHUP
, Qnil
, 1);
2746 /* On receipt of a signal that a child status has changed,
2747 loop asking about children with changed statuses until
2748 the system says there are no more.
2749 All we do is change the status;
2750 we do not run sentinels or print notifications.
2751 That is saved for the next time keyboard input is done,
2752 in order to avoid timing errors. */
2754 /** WARNING: this can be called during garbage collection.
2755 Therefore, it must not be fooled by the presence of mark bits in
2758 /** USG WARNING: Although it is not obvious from the documentation
2759 in signal(2), on a USG system the SIGCLD handler MUST NOT call
2760 signal() before executing at least one wait(), otherwise the handler
2761 will be called again, resulting in an infinite loop. The relevant
2762 portion of the documentation reads "SIGCLD signals will be queued
2763 and the signal-catching function will be continually reentered until
2764 the queue is empty". Invoking signal() causes the kernel to reexamine
2765 the SIGCLD queue. Fred Fish, UniSoft Systems Inc. */
2768 sigchld_handler (signo
)
2771 int old_errno
= errno
;
2773 register struct Lisp_Process
*p
;
2774 extern EMACS_TIME
*input_available_clear_time
;
2778 sigheld
|= sigbit (SIGCHLD
);
2790 #endif /* no WUNTRACED */
2791 /* Keep trying to get a status until we get a definitive result. */
2795 pid
= wait3 (&w
, WNOHANG
| WUNTRACED
, 0);
2797 while (pid
<= 0 && errno
== EINTR
);
2801 /* A real failure. We have done all our job, so return. */
2803 /* USG systems forget handlers when they are used;
2804 must reestablish each time */
2806 signal (signo
, sigchld_handler
); /* WARNING - must come after wait3() */
2809 sigheld
&= ~sigbit (SIGCHLD
);
2817 #endif /* no WNOHANG */
2819 /* Find the process that signaled us, and record its status. */
2822 for (tail
= Vprocess_alist
; XSYMBOL (tail
) != XSYMBOL (Qnil
); tail
= XCONS (tail
)->cdr
)
2824 proc
= XCONS (XCONS (tail
)->car
)->cdr
;
2825 p
= XPROCESS (proc
);
2826 if (EQ (p
->childp
, Qt
) && XFASTINT (p
->pid
) == pid
)
2831 /* Look for an asynchronous process whose pid hasn't been filled
2834 for (tail
= Vprocess_alist
; XSYMBOL (tail
) != XSYMBOL (Qnil
); tail
= XCONS (tail
)->cdr
)
2836 proc
= XCONS (XCONS (tail
)->car
)->cdr
;
2837 p
= XPROCESS (proc
);
2838 if (XTYPE (p
->pid
) == Lisp_Int
&& XINT (p
->pid
) == -1)
2843 /* Change the status of the process that was found. */
2846 union { int i
; WAITTYPE wt
; } u
;
2848 XSETINT (p
->tick
, ++process_tick
);
2850 XFASTINT (p
->raw_status_low
) = u
.i
& 0xffff;
2851 XFASTINT (p
->raw_status_high
) = u
.i
>> 16;
2853 /* If process has terminated, stop waiting for its output. */
2854 if (WIFSIGNALED (w
) || WIFEXITED (w
))
2855 if (XINT (p
->infd
) >= 0)
2856 FD_CLR (XINT (p
->infd
), &input_wait_mask
);
2858 /* Tell wait_reading_process_input that it needs to wake up and
2860 if (input_available_clear_time
)
2861 EMACS_SET_SECS_USECS (*input_available_clear_time
, 0, 0);
2864 /* There was no asynchronous process found for that id. Check
2865 if we have a synchronous process. */
2868 synch_process_alive
= 0;
2870 /* Report the status of the synchronous process. */
2872 synch_process_retcode
= WRETCODE (w
);
2873 else if (WIFSIGNALED (w
))
2875 int code
= WTERMSIG (w
);
2881 signame
= sys_siglist
[code
];
2883 signame
= sys_errlist
[code
];
2887 signame
= "unknown";
2889 synch_process_death
= signame
;
2892 /* Tell wait_reading_process_input that it needs to wake up and
2894 if (input_available_clear_time
)
2895 EMACS_SET_SECS_USECS (*input_available_clear_time
, 0, 0);
2898 /* On some systems, we must return right away.
2899 If any more processes want to signal us, we will
2901 Otherwise (on systems that have WNOHANG), loop around
2902 to use up all the processes that have something to tell us. */
2903 #if defined (USG) && ! (defined (HPUX) && defined (WNOHANG))
2905 signal (signo
, sigchld_handler
);
2909 #endif /* USG, but not HPUX with WNOHANG */
2915 exec_sentinel_unwind (data
)
2918 XPROCESS (XCONS (data
)->car
)->sentinel
= XCONS (data
)->cdr
;
2923 exec_sentinel (proc
, reason
)
2924 Lisp_Object proc
, reason
;
2926 Lisp_Object sentinel
;
2927 register struct Lisp_Process
*p
= XPROCESS (proc
);
2928 int count
= specpdl_ptr
- specpdl
;
2930 sentinel
= p
->sentinel
;
2931 if (NILP (sentinel
))
2934 /* Zilch the sentinel while it's running, to avoid recursive invocations;
2935 assure that it gets restored no matter how the sentinel exits. */
2937 record_unwind_protect (exec_sentinel_unwind
, Fcons (proc
, sentinel
));
2938 /* Inhibit quit so that random quits don't screw up a running filter. */
2939 specbind (Qinhibit_quit
, Qt
);
2940 call2 (sentinel
, proc
, reason
);
2941 unbind_to (count
, Qnil
);
2944 /* Report all recent events of a change in process status
2945 (either run the sentinel or output a message).
2946 This is done while Emacs is waiting for keyboard input. */
2950 register Lisp_Object proc
, buffer
;
2951 Lisp_Object tail
= Qnil
;
2952 Lisp_Object msg
= Qnil
;
2953 struct gcpro gcpro1
, gcpro2
;
2955 /* We need to gcpro tail; if read_process_output calls a filter
2956 which deletes a process and removes the cons to which tail points
2957 from Vprocess_alist, and then causes a GC, tail is an unprotected
2961 for (tail
= Vprocess_alist
; !NILP (tail
); tail
= Fcdr (tail
))
2964 register struct Lisp_Process
*p
;
2966 proc
= Fcdr (Fcar (tail
));
2967 p
= XPROCESS (proc
);
2969 if (XINT (p
->tick
) != XINT (p
->update_tick
))
2971 XSETINT (p
->update_tick
, XINT (p
->tick
));
2973 /* If process is still active, read any output that remains. */
2974 if (XINT (p
->infd
) >= 0)
2975 while (! EQ (p
->filter
, Qt
)
2976 && read_process_output (proc
, XINT (p
->infd
)) > 0);
2980 /* Get the text to use for the message. */
2981 if (!NILP (p
->raw_status_low
))
2983 msg
= status_message (p
->status
);
2985 /* If process is terminated, deactivate it or delete it. */
2987 if (XTYPE (p
->status
) == Lisp_Cons
)
2988 symbol
= XCONS (p
->status
)->car
;
2990 if (EQ (symbol
, Qsignal
) || EQ (symbol
, Qexit
)
2991 || EQ (symbol
, Qclosed
))
2993 if (delete_exited_processes
)
2994 remove_process (proc
);
2996 deactivate_process (proc
);
2999 /* Now output the message suitably. */
3000 if (!NILP (p
->sentinel
))
3001 exec_sentinel (proc
, msg
);
3002 /* Don't bother with a message in the buffer
3003 when a process becomes runnable. */
3004 else if (!EQ (symbol
, Qrun
) && !NILP (buffer
))
3006 Lisp_Object ro
= XBUFFER (buffer
)->read_only
;
3008 struct buffer
*old
= current_buffer
;
3011 /* Avoid error if buffer is deleted
3012 (probably that's why the process is dead, too) */
3013 if (NILP (XBUFFER (buffer
)->name
))
3015 Fset_buffer (buffer
);
3017 /* Insert new output into buffer
3018 at the current end-of-output marker,
3019 thus preserving logical ordering of input and output. */
3020 if (XMARKER (p
->mark
)->buffer
)
3021 SET_PT (marker_position (p
->mark
));
3024 if (point
<= opoint
)
3025 opoint
+= XSTRING (msg
)->size
+ XSTRING (p
->name
)->size
+ 10;
3027 tem
= current_buffer
->read_only
;
3028 current_buffer
->read_only
= Qnil
;
3029 insert_string ("\nProcess ");
3030 Finsert (1, &p
->name
);
3031 insert_string (" ");
3033 current_buffer
->read_only
= tem
;
3034 Fset_marker (p
->mark
, make_number (point
), p
->buffer
);
3037 set_buffer_internal (old
);
3042 update_mode_lines
++; /* in case buffers use %s in mode-line-format */
3043 redisplay_preserve_echo_area ();
3045 update_tick
= process_tick
;
3056 if (! noninteractive
|| initialized
)
3058 signal (SIGCHLD
, sigchld_handler
);
3061 FD_ZERO (&input_wait_mask
);
3063 keyboard_descriptor
= 0;
3064 FD_SET (keyboard_descriptor
, &input_wait_mask
);
3066 Vprocess_alist
= Qnil
;
3067 for (i
= 0; i
< MAXDESC
; i
++)
3069 chan_process
[i
] = Qnil
;
3070 proc_buffered_char
[i
] = -1;
3074 /* From now on, assume keyboard input comes from descriptor DESC. */
3077 change_keyboard_wait_descriptor (desc
)
3080 FD_CLR (keyboard_descriptor
, &input_wait_mask
);
3081 keyboard_descriptor
= desc
;
3082 FD_SET (keyboard_descriptor
, &input_wait_mask
);
3088 stream_process
= intern ("stream");
3090 Qprocessp
= intern ("processp");
3091 staticpro (&Qprocessp
);
3092 Qrun
= intern ("run");
3094 Qstop
= intern ("stop");
3096 Qsignal
= intern ("signal");
3097 staticpro (&Qsignal
);
3099 /* Qexit is already staticpro'd by syms_of_eval; don't staticpro it
3102 Qexit = intern ("exit");
3103 staticpro (&Qexit); */
3105 Qopen
= intern ("open");
3107 Qclosed
= intern ("closed");
3108 staticpro (&Qclosed
);
3110 staticpro (&Vprocess_alist
);
3112 DEFVAR_BOOL ("delete-exited-processes", &delete_exited_processes
,
3113 "*Non-nil means delete processes immediately when they exit.\n\
3114 nil means don't delete them until `list-processes' is run.");
3116 delete_exited_processes
= 1;
3118 DEFVAR_LISP ("process-connection-type", &Vprocess_connection_type
,
3119 "Control type of device used to communicate with subprocesses.\n\
3120 Values are nil to use a pipe, and t or 'pty for a pty. Note that if\n\
3121 pty's are not available, this variable will be ignored. The value takes\n\
3122 effect when `start-process' is called.");
3123 Vprocess_connection_type
= Qt
;
3125 defsubr (&Sprocessp
);
3126 defsubr (&Sget_process
);
3127 defsubr (&Sget_buffer_process
);
3128 defsubr (&Sdelete_process
);
3129 defsubr (&Sprocess_status
);
3130 defsubr (&Sprocess_exit_status
);
3131 defsubr (&Sprocess_id
);
3132 defsubr (&Sprocess_name
);
3133 defsubr (&Sprocess_command
);
3134 defsubr (&Sset_process_buffer
);
3135 defsubr (&Sprocess_buffer
);
3136 defsubr (&Sprocess_mark
);
3137 defsubr (&Sset_process_filter
);
3138 defsubr (&Sprocess_filter
);
3139 defsubr (&Sset_process_sentinel
);
3140 defsubr (&Sprocess_sentinel
);
3141 defsubr (&Sprocess_kill_without_query
);
3142 defsubr (&Slist_processes
);
3143 defsubr (&Sprocess_list
);
3144 defsubr (&Sstart_process
);
3146 defsubr (&Sopen_network_stream
);
3147 #endif /* HAVE_SOCKETS */
3148 defsubr (&Saccept_process_output
);
3149 defsubr (&Sprocess_send_region
);
3150 defsubr (&Sprocess_send_string
);
3151 defsubr (&Sinterrupt_process
);
3152 defsubr (&Skill_process
);
3153 defsubr (&Squit_process
);
3154 defsubr (&Sstop_process
);
3155 defsubr (&Scontinue_process
);
3156 defsubr (&Sprocess_send_eof
);
3157 defsubr (&Ssignal_process
);
3158 defsubr (&Swaiting_for_user_input_p
);
3159 /* defsubr (&Sprocess_connection); */
3163 #else /* not subprocesses */
3165 #include <sys/types.h>
3169 #include "systime.h"
3170 #include "termopts.h"
3172 extern int frame_garbaged
;
3175 /* As described above, except assuming that there are no subprocesses:
3177 Wait for timeout to elapse and/or keyboard input to be available.
3180 timeout in seconds, or
3181 zero for no limit, or
3182 -1 means gobble data immediately available but don't wait for any.
3184 read_kbd is a Lisp_Object:
3185 0 to ignore keyboard input, or
3186 1 to return when input is available, or
3187 -1 means caller will actually read the input, so don't throw to
3189 We know that read_kbd will never be a Lisp_Process, since
3190 `subprocesses' isn't defined.
3192 do_display != 0 means redisplay should be done to show subprocess
3193 output that arrives. This version of the function ignores it.
3195 Return true iff we received input from any process. */
3198 wait_reading_process_input (time_limit
, microsecs
, read_kbd
, do_display
)
3199 int time_limit
, microsecs
;
3200 Lisp_Object read_kbd
;
3203 EMACS_TIME end_time
, timeout
, *timeout_p
;
3206 /* What does time_limit really mean? */
3207 if (time_limit
|| microsecs
)
3209 /* It's not infinite. */
3210 timeout_p
= &timeout
;
3212 if (time_limit
== -1)
3213 /* In fact, it's zero. */
3214 EMACS_SET_SECS_USECS (timeout
, 0, 0);
3216 EMACS_SET_SECS_USECS (timeout
, time_limit
, microsecs
);
3218 /* How far in the future is that? */
3219 EMACS_GET_TIME (end_time
);
3220 EMACS_ADD_TIME (end_time
, end_time
, timeout
);
3223 /* It's infinite. */
3226 /* This must come before stop_polling. */
3227 prepare_menu_bars ();
3229 /* Turn off periodic alarms (in case they are in use)
3230 because the select emulator uses alarms. */
3237 waitchannels
= XINT (read_kbd
) ? 1 : 0;
3239 /* If calling from keyboard input, do not quit
3240 since we want to return C-g as an input character.
3241 Otherwise, do pending quit if requested. */
3242 if (XINT (read_kbd
) >= 0)
3247 EMACS_GET_TIME (*timeout_p
);
3248 EMACS_SUB_TIME (*timeout_p
, end_time
, *timeout_p
);
3249 if (EMACS_TIME_NEG_P (*timeout_p
))
3253 /* Cause C-g and alarm signals to take immediate action,
3254 and cause input available signals to zero out timeout. */
3255 if (XINT (read_kbd
) < 0)
3256 set_waiting_for_input (&timeout
);
3258 /* If a frame has been newly mapped and needs updating,
3259 reprocess its display stuff. */
3261 redisplay_preserve_echo_area ();
3263 if (XINT (read_kbd
) && detect_input_pending ())
3266 nfds
= select (1, &waitchannels
, 0, 0, timeout_p
);
3268 /* Make C-g and alarm signals set flags again */
3269 clear_waiting_for_input ();
3271 /* If we woke up due to SIGWINCH, actually change size now. */
3272 do_pending_window_change ();
3276 /* If the system call was interrupted, then go around the
3282 else if (nfds
> 0 && (waitchannels
& 1) && interrupt_input
)
3283 /* System sometimes fails to deliver SIGIO. */
3284 kill (getpid (), SIGIO
);
3287 if (XINT (read_kbd
) && interrupt_input
&& (waitchannels
& 1))
3291 /* If we have timed out (nfds == 0) or found some input (nfds > 0),
3303 DEFUN ("get-buffer-process", Fget_buffer_process
, Sget_buffer_process
, 1, 1, 0,
3304 /* Don't confused make-docfile by having two doc strings for this function.
3305 make-docfile does not pay attention to #if, for good reason! */
3308 register Lisp_Object name
;
3313 /* Kill all processes associated with `buffer'.
3314 If `buffer' is nil, kill all processes.
3315 Since we have no subprocesses, this does nothing. */
3317 kill_buffer_processes (buffer
)
3328 defsubr (&Sget_buffer_process
);
3332 #endif /* not subprocesses */