1 /* Asynchronous subprocess control for GNU Emacs.
2 Copyright (C) 1985, 86, 87, 88, 93, 94, 95, 96, 1998
3 Free Software Foundation, Inc.
5 This file is part of GNU Emacs.
7 GNU Emacs is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU Emacs is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU Emacs; see the file COPYING. If not, write to
19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
27 /* This file is split into two parts by the following preprocessor
28 conditional. The 'then' clause contains all of the support for
29 asynchronous subprocesses. The 'else' clause contains stub
30 versions of some of the asynchronous subprocess routines that are
31 often called elsewhere in Emacs, so we don't have to #ifdef the
32 sections that call them. */
40 #include <sys/types.h> /* some typedefs are used in sys/file.h */
50 #endif /* not WINDOWSNT */
52 #ifdef HAVE_SOCKETS /* TCP connection support, if kernel can do it */
53 #include <sys/socket.h>
55 #include <netinet/in.h>
56 #include <arpa/inet.h>
57 #ifdef NEED_NET_ERRNO_H
58 #include <net/errno.h>
59 #endif /* NEED_NET_ERRNO_H */
60 #endif /* HAVE_SOCKETS */
62 /* TERM is a poor-man's SLIP, used on Linux. */
67 /* On some systems, e.g. DGUX, inet_addr returns a 'struct in_addr'. */
68 #ifdef HAVE_BROKEN_INET_ADDR
69 #define IN_ADDR struct in_addr
70 #define NUMERIC_ADDR_ERROR (numeric_addr.s_addr == -1)
72 #define IN_ADDR unsigned long
73 #define NUMERIC_ADDR_ERROR (numeric_addr == -1)
76 #if defined(BSD_SYSTEM) || defined(STRIDE)
77 #include <sys/ioctl.h>
78 #if !defined (O_NDELAY) && defined (HAVE_PTYS) && !defined(USG5)
80 #endif /* HAVE_PTYS and no O_NDELAY */
81 #endif /* BSD_SYSTEM || STRIDE */
83 #ifdef BROKEN_O_NONBLOCK
85 #endif /* BROKEN_O_NONBLOCK */
92 #include <sys/sysmacros.h> /* for "minor" */
104 #include "termhooks.h"
105 #include "termopts.h"
106 #include "commands.h"
108 #include "blockinput.h"
109 #include "keyboard.h"
110 #include "dispextern.h"
112 #define max(a, b) ((a) > (b) ? (a) : (b))
114 Lisp_Object Qprocessp
;
115 Lisp_Object Qrun
, Qstop
, Qsignal
, Qopen
, Qclosed
;
116 Lisp_Object Qlast_nonmenu_event
;
117 /* Qexit is declared and initialized in eval.c. */
119 /* a process object is a network connection when its childp field is neither
120 Qt nor Qnil but is instead a cons cell (HOSTNAME PORTNUM). */
123 #define NETCONN_P(p) (GC_CONSP (XPROCESS (p)->childp))
125 #define NETCONN_P(p) 0
126 #endif /* HAVE_SOCKETS */
128 /* Define first descriptor number available for subprocesses. */
130 #define FIRST_PROC_DESC 1
132 #define FIRST_PROC_DESC 3
135 /* Define SIGCHLD as an alias for SIGCLD. There are many conditionals
138 #if !defined (SIGCHLD) && defined (SIGCLD)
139 #define SIGCHLD SIGCLD
142 #include "syssignal.h"
147 extern char *strerror ();
149 extern char *sys_errlist
[];
156 #ifndef SYS_SIGLIST_DECLARED
161 extern char *sys_siglist
[];
162 #endif /* not LINUX */
164 char *sys_siglist
[] =
170 "illegal instruction",
174 "floating point exception",
177 "segmentation violation",
178 "bad argument to system call",
179 "write on a pipe with no one to read it",
181 "software termination signal from kill",
183 "sendable stop signal not from tty",
184 "stop signal from tty",
185 "continue a stopped process",
186 "child status has changed",
187 "background read attempted from control tty",
188 "background write attempted from control tty",
189 "input record available at control tty",
190 "exceeded CPU time limit",
191 "exceeded file size limit"
193 #endif /* not WINDOWSNT */
196 #endif /* ! SYS_SIGLIST_DECLARED */
198 /* t means use pty, nil means use a pipe,
199 maybe other values to come. */
200 static Lisp_Object Vprocess_connection_type
;
204 #include <sys/socket.h>
208 /* These next two vars are non-static since sysdep.c uses them in the
209 emulation of `select'. */
210 /* Number of events of change of status of a process. */
212 /* Number of events for which the user or sentinel has been notified. */
215 #include "sysselect.h"
217 /* If we support a window system, turn on the code to poll periodically
218 to detect C-g. It isn't actually used when doing interrupt input. */
219 #ifdef HAVE_WINDOW_SYSTEM
220 #define POLL_FOR_INPUT
223 /* Mask of bits indicating the descriptors that we wait for input on. */
225 static SELECT_TYPE input_wait_mask
;
227 /* Mask that excludes keyboard input descriptor (s). */
229 static SELECT_TYPE non_keyboard_wait_mask
;
231 /* Mask that excludes process input descriptor (s). */
233 static SELECT_TYPE non_process_wait_mask
;
235 /* The largest descriptor currently in use for a process object. */
236 static int max_process_desc
;
238 /* The largest descriptor currently in use for keyboard input. */
239 static int max_keyboard_desc
;
241 /* Nonzero means delete a process right away if it exits. */
242 static int delete_exited_processes
;
244 /* Indexed by descriptor, gives the process (if any) for that descriptor */
245 Lisp_Object chan_process
[MAXDESC
];
247 /* Alist of elements (NAME . PROCESS) */
248 Lisp_Object Vprocess_alist
;
250 /* Buffered-ahead input char from process, indexed by channel.
251 -1 means empty (no char is buffered).
252 Used on sys V where the only way to tell if there is any
253 output from the process is to read at least one char.
254 Always -1 on systems that support FIONREAD. */
256 /* Don't make static; need to access externally. */
257 int proc_buffered_char
[MAXDESC
];
259 /* Table of `struct coding-system' for each process. */
260 static struct coding_system
*proc_decode_coding_system
[MAXDESC
];
261 static struct coding_system
*proc_encode_coding_system
[MAXDESC
];
263 static Lisp_Object
get_process ();
265 extern EMACS_TIME
timer_check ();
266 extern int timers_run
;
268 /* Maximum number of bytes to send to a pty without an eof. */
269 static int pty_max_bytes
;
271 extern Lisp_Object Vfile_name_coding_system
, Vdefault_file_name_coding_system
;
274 /* The file name of the pty opened by allocate_pty. */
276 static char pty_name
[24];
279 /* Compute the Lisp form of the process status, p->status, from
280 the numeric status that was returned by `wait'. */
282 Lisp_Object
status_convert ();
286 struct Lisp_Process
*p
;
288 union { int i
; WAITTYPE wt
; } u
;
289 u
.i
= XFASTINT (p
->raw_status_low
) + (XFASTINT (p
->raw_status_high
) << 16);
290 p
->status
= status_convert (u
.wt
);
291 p
->raw_status_low
= Qnil
;
292 p
->raw_status_high
= Qnil
;
295 /* Convert a process status word in Unix format to
296 the list that we use internally. */
303 return Fcons (Qstop
, Fcons (make_number (WSTOPSIG (w
)), Qnil
));
304 else if (WIFEXITED (w
))
305 return Fcons (Qexit
, Fcons (make_number (WRETCODE (w
)),
306 WCOREDUMP (w
) ? Qt
: Qnil
));
307 else if (WIFSIGNALED (w
))
308 return Fcons (Qsignal
, Fcons (make_number (WTERMSIG (w
)),
309 WCOREDUMP (w
) ? Qt
: Qnil
));
314 /* Given a status-list, extract the three pieces of information
315 and store them individually through the three pointers. */
318 decode_status (l
, symbol
, code
, coredump
)
334 *symbol
= XCONS (l
)->car
;
335 tem
= XCONS (l
)->cdr
;
336 *code
= XFASTINT (XCONS (tem
)->car
);
337 tem
= XCONS (tem
)->cdr
;
338 *coredump
= !NILP (tem
);
342 /* Return a string describing a process status list. */
345 status_message (status
)
350 Lisp_Object string
, string2
;
352 decode_status (status
, &symbol
, &code
, &coredump
);
354 if (EQ (symbol
, Qsignal
) || EQ (symbol
, Qstop
))
360 /* Cast to suppress warning if the table has const char *. */
361 signame
= (char *) sys_siglist
[code
];
363 signame
= sys_errlist
[code
];
368 string
= build_string (signame
);
369 string2
= build_string (coredump
? " (core dumped)\n" : "\n");
370 XSTRING (string
)->data
[0] = DOWNCASE (XSTRING (string
)->data
[0]);
371 return concat2 (string
, string2
);
373 else if (EQ (symbol
, Qexit
))
376 return build_string ("finished\n");
377 string
= Fnumber_to_string (make_number (code
));
378 string2
= build_string (coredump
? " (core dumped)\n" : "\n");
379 return concat2 (build_string ("exited abnormally with code "),
380 concat2 (string
, string2
));
383 return Fcopy_sequence (Fsymbol_name (symbol
));
388 /* Open an available pty, returning a file descriptor.
389 Return -1 on failure.
390 The file name of the terminal corresponding to the pty
391 is left in the variable pty_name. */
400 /* Some systems name their pseudoterminals so that there are gaps in
401 the usual sequence - for example, on HP9000/S700 systems, there
402 are no pseudoterminals with names ending in 'f'. So we wait for
403 three failures in a row before deciding that we've reached the
405 int failed_count
= 0;
410 for (c
= FIRST_PTY_LETTER
; c
<= 'z'; c
++)
411 for (i
= 0; i
< 16; i
++)
414 #ifdef PTY_NAME_SPRINTF
417 sprintf (pty_name
, "/dev/pty%c%x", c
, i
);
418 #endif /* no PTY_NAME_SPRINTF */
422 #else /* no PTY_OPEN */
424 /* Unusual IRIS code */
425 *ptyv
= open ("/dev/ptc", O_RDWR
| O_NDELAY
, 0);
428 if (fstat (fd
, &stb
) < 0)
431 if (stat (pty_name
, &stb
) < 0)
434 if (failed_count
>= 3)
440 fd
= open (pty_name
, O_RDWR
| O_NONBLOCK
, 0);
442 fd
= open (pty_name
, O_RDWR
| O_NDELAY
, 0);
444 #endif /* not IRIS */
445 #endif /* no PTY_OPEN */
449 /* check to make certain that both sides are available
450 this avoids a nasty yet stupid bug in rlogins */
451 #ifdef PTY_TTY_NAME_SPRINTF
454 sprintf (pty_name
, "/dev/tty%c%x", c
, i
);
455 #endif /* no PTY_TTY_NAME_SPRINTF */
457 if (access (pty_name
, 6) != 0)
460 #if !defined(IRIS) && !defined(__sgi)
466 #endif /* not UNIPLUS */
473 #endif /* HAVE_PTYS */
479 struct Lisp_Vector
*vec
;
480 register Lisp_Object val
, tem
, name1
;
481 register struct Lisp_Process
*p
;
485 vec
= allocate_vectorlike ((EMACS_INT
) VECSIZE (struct Lisp_Process
));
486 for (i
= 0; i
< VECSIZE (struct Lisp_Process
); i
++)
487 vec
->contents
[i
] = Qnil
;
488 vec
->size
= VECSIZE (struct Lisp_Process
);
489 p
= (struct Lisp_Process
*)vec
;
491 XSETINT (p
->infd
, -1);
492 XSETINT (p
->outfd
, -1);
493 XSETFASTINT (p
->pid
, 0);
494 XSETFASTINT (p
->tick
, 0);
495 XSETFASTINT (p
->update_tick
, 0);
496 p
->raw_status_low
= Qnil
;
497 p
->raw_status_high
= Qnil
;
499 p
->mark
= Fmake_marker ();
501 /* If name is already in use, modify it until it is unused. */
506 tem
= Fget_process (name1
);
507 if (NILP (tem
)) break;
508 sprintf (suffix
, "<%d>", i
);
509 name1
= concat2 (name
, build_string (suffix
));
513 XSETPROCESS (val
, p
);
514 Vprocess_alist
= Fcons (Fcons (name
, val
), Vprocess_alist
);
519 remove_process (proc
)
520 register Lisp_Object proc
;
522 register Lisp_Object pair
;
524 pair
= Frassq (proc
, Vprocess_alist
);
525 Vprocess_alist
= Fdelq (pair
, Vprocess_alist
);
527 deactivate_process (proc
);
530 DEFUN ("processp", Fprocessp
, Sprocessp
, 1, 1, 0,
531 "Return t if OBJECT is a process.")
535 return PROCESSP (object
) ? Qt
: Qnil
;
538 DEFUN ("get-process", Fget_process
, Sget_process
, 1, 1, 0,
539 "Return the process named NAME, or nil if there is none.")
541 register Lisp_Object name
;
545 CHECK_STRING (name
, 0);
546 return Fcdr (Fassoc (name
, Vprocess_alist
));
549 DEFUN ("get-buffer-process", Fget_buffer_process
, Sget_buffer_process
, 1, 1, 0,
550 "Return the (or a) process associated with BUFFER.\n\
551 BUFFER may be a buffer or the name of one.")
553 register Lisp_Object buffer
;
555 register Lisp_Object buf
, tail
, proc
;
557 if (NILP (buffer
)) return Qnil
;
558 buf
= Fget_buffer (buffer
);
559 if (NILP (buf
)) return Qnil
;
561 for (tail
= Vprocess_alist
; !NILP (tail
); tail
= Fcdr (tail
))
563 proc
= Fcdr (Fcar (tail
));
564 if (PROCESSP (proc
) && EQ (XPROCESS (proc
)->buffer
, buf
))
570 /* This is how commands for the user decode process arguments. It
571 accepts a process, a process name, a buffer, a buffer name, or nil.
572 Buffers denote the first process in the buffer, and nil denotes the
577 register Lisp_Object name
;
579 register Lisp_Object proc
, obj
;
582 obj
= Fget_process (name
);
584 obj
= Fget_buffer (name
);
586 error ("Process %s does not exist", XSTRING (name
)->data
);
588 else if (NILP (name
))
589 obj
= Fcurrent_buffer ();
593 /* Now obj should be either a buffer object or a process object.
597 proc
= Fget_buffer_process (obj
);
599 error ("Buffer %s has no process", XSTRING (XBUFFER (obj
)->name
)->data
);
603 CHECK_PROCESS (obj
, 0);
609 DEFUN ("delete-process", Fdelete_process
, Sdelete_process
, 1, 1, 0,
610 "Delete PROCESS: kill it and forget about it immediately.\n\
611 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
612 nil, indicating the current buffer's process.")
614 register Lisp_Object process
;
616 process
= get_process (process
);
617 XPROCESS (process
)->raw_status_low
= Qnil
;
618 XPROCESS (process
)->raw_status_high
= Qnil
;
619 if (NETCONN_P (process
))
621 XPROCESS (process
)->status
= Fcons (Qexit
, Fcons (make_number (0), Qnil
));
622 XSETINT (XPROCESS (process
)->tick
, ++process_tick
);
624 else if (XINT (XPROCESS (process
)->infd
) >= 0)
626 Fkill_process (process
, Qnil
);
627 /* Do this now, since remove_process will make sigchld_handler do nothing. */
628 XPROCESS (process
)->status
629 = Fcons (Qsignal
, Fcons (make_number (SIGKILL
), Qnil
));
630 XSETINT (XPROCESS (process
)->tick
, ++process_tick
);
633 remove_process (process
);
637 DEFUN ("process-status", Fprocess_status
, Sprocess_status
, 1, 1, 0,
638 "Return the status of PROCESS.\n\
639 The returned value is one of the following symbols:\n\
640 run -- for a process that is running.\n\
641 stop -- for a process stopped but continuable.\n\
642 exit -- for a process that has exited.\n\
643 signal -- for a process that has got a fatal signal.\n\
644 open -- for a network stream connection that is open.\n\
645 closed -- for a network stream connection that is closed.\n\
646 nil -- if arg is a process name and no such process exists.\n\
647 PROCESS may be a process, a buffer, the name of a process, or\n\
648 nil, indicating the current buffer's process.")
650 register Lisp_Object process
;
652 register struct Lisp_Process
*p
;
653 register Lisp_Object status
;
655 if (STRINGP (process
))
656 process
= Fget_process (process
);
658 process
= get_process (process
);
663 p
= XPROCESS (process
);
664 if (!NILP (p
->raw_status_low
))
668 status
= XCONS (status
)->car
;
669 if (NETCONN_P (process
))
671 if (EQ (status
, Qrun
))
673 else if (EQ (status
, Qexit
))
679 DEFUN ("process-exit-status", Fprocess_exit_status
, Sprocess_exit_status
,
681 "Return the exit status of PROCESS or the signal number that killed it.\n\
682 If PROCESS has not yet exited or died, return 0.")
684 register Lisp_Object process
;
686 CHECK_PROCESS (process
, 0);
687 if (!NILP (XPROCESS (process
)->raw_status_low
))
688 update_status (XPROCESS (process
));
689 if (CONSP (XPROCESS (process
)->status
))
690 return XCONS (XCONS (XPROCESS (process
)->status
)->cdr
)->car
;
691 return make_number (0);
694 DEFUN ("process-id", Fprocess_id
, Sprocess_id
, 1, 1, 0,
695 "Return the process id of PROCESS.\n\
696 This is the pid of the Unix process which PROCESS uses or talks to.\n\
697 For a network connection, this value is nil.")
699 register Lisp_Object process
;
701 CHECK_PROCESS (process
, 0);
702 return XPROCESS (process
)->pid
;
705 DEFUN ("process-name", Fprocess_name
, Sprocess_name
, 1, 1, 0,
706 "Return the name of PROCESS, as a string.\n\
707 This is the name of the program invoked in PROCESS,\n\
708 possibly modified to make it unique among process names.")
710 register Lisp_Object process
;
712 CHECK_PROCESS (process
, 0);
713 return XPROCESS (process
)->name
;
716 DEFUN ("process-command", Fprocess_command
, Sprocess_command
, 1, 1, 0,
717 "Return the command that was executed to start PROCESS.\n\
718 This is a list of strings, the first string being the program executed\n\
719 and the rest of the strings being the arguments given to it.\n\
720 For a non-child channel, this is nil.")
722 register Lisp_Object process
;
724 CHECK_PROCESS (process
, 0);
725 return XPROCESS (process
)->command
;
728 DEFUN ("process-tty-name", Fprocess_tty_name
, Sprocess_tty_name
, 1, 1, 0,
729 "Return the name of the terminal PROCESS uses, or nil if none.\n\
730 This is the terminal that the process itself reads and writes on,\n\
731 not the name of the pty that Emacs uses to talk with that terminal.")
733 register Lisp_Object process
;
735 CHECK_PROCESS (process
, 0);
736 return XPROCESS (process
)->tty_name
;
739 DEFUN ("set-process-buffer", Fset_process_buffer
, Sset_process_buffer
,
741 "Set buffer associated with PROCESS to BUFFER (a buffer, or nil).")
743 register Lisp_Object process
, buffer
;
745 CHECK_PROCESS (process
, 0);
747 CHECK_BUFFER (buffer
, 1);
748 XPROCESS (process
)->buffer
= buffer
;
752 DEFUN ("process-buffer", Fprocess_buffer
, Sprocess_buffer
,
754 "Return the buffer PROCESS is associated with.\n\
755 Output from PROCESS is inserted in this buffer unless PROCESS has a filter.")
757 register Lisp_Object process
;
759 CHECK_PROCESS (process
, 0);
760 return XPROCESS (process
)->buffer
;
763 DEFUN ("process-mark", Fprocess_mark
, Sprocess_mark
,
765 "Return the marker for the end of the last output from PROCESS.")
767 register Lisp_Object process
;
769 CHECK_PROCESS (process
, 0);
770 return XPROCESS (process
)->mark
;
773 DEFUN ("set-process-filter", Fset_process_filter
, Sset_process_filter
,
775 "Give PROCESS the filter function FILTER; nil means no filter.\n\
776 t means stop accepting output from the process.\n\
777 When a process has a filter, each time it does output\n\
778 the entire string of output is passed to the filter.\n\
779 The filter gets two arguments: the process and the string of output.\n\
780 If the process has a filter, its buffer is not used for output.")
782 register Lisp_Object process
, filter
;
784 CHECK_PROCESS (process
, 0);
787 FD_CLR (XINT (XPROCESS (process
)->infd
), &input_wait_mask
);
788 FD_CLR (XINT (XPROCESS (process
)->infd
), &non_keyboard_wait_mask
);
790 else if (EQ (XPROCESS (process
)->filter
, Qt
))
792 FD_SET (XINT (XPROCESS (process
)->infd
), &input_wait_mask
);
793 FD_SET (XINT (XPROCESS (process
)->infd
), &non_keyboard_wait_mask
);
795 XPROCESS (process
)->filter
= filter
;
799 DEFUN ("process-filter", Fprocess_filter
, Sprocess_filter
,
801 "Returns the filter function of PROCESS; nil if none.\n\
802 See `set-process-filter' for more info on filter functions.")
804 register Lisp_Object process
;
806 CHECK_PROCESS (process
, 0);
807 return XPROCESS (process
)->filter
;
810 DEFUN ("set-process-sentinel", Fset_process_sentinel
, Sset_process_sentinel
,
812 "Give PROCESS the sentinel SENTINEL; nil for none.\n\
813 The sentinel is called as a function when the process changes state.\n\
814 It gets two arguments: the process, and a string describing the change.")
816 register Lisp_Object process
, sentinel
;
818 CHECK_PROCESS (process
, 0);
819 XPROCESS (process
)->sentinel
= sentinel
;
823 DEFUN ("process-sentinel", Fprocess_sentinel
, Sprocess_sentinel
,
825 "Return the sentinel of PROCESS; nil if none.\n\
826 See `set-process-sentinel' for more info on sentinels.")
828 register Lisp_Object process
;
830 CHECK_PROCESS (process
, 0);
831 return XPROCESS (process
)->sentinel
;
834 DEFUN ("set-process-window-size", Fset_process_window_size
,
835 Sset_process_window_size
, 3, 3, 0,
836 "Tell PROCESS that it has logical window size HEIGHT and WIDTH.")
837 (process
, height
, width
)
838 register Lisp_Object process
, height
, width
;
840 CHECK_PROCESS (process
, 0);
841 CHECK_NATNUM (height
, 0);
842 CHECK_NATNUM (width
, 0);
843 if (set_window_size (XINT (XPROCESS (process
)->infd
),
844 XINT (height
), XINT(width
)) <= 0)
850 DEFUN ("set-process-inherit-coding-system-flag",
851 Fset_process_inherit_coding_system_flag
,
852 Sset_process_inherit_coding_system_flag
, 2, 2, 0,
853 "Determine whether buffer of PROCESS will inherit coding-system.\n\
854 If the second argument FLAG is non-nil, then the variable\n\
855 `buffer-file-coding-system' of the buffer associated with PROCESS\n\
856 will be bound to the value of the coding system used to decode\n\
857 the process output.\n\
859 This is useful when the coding system specified for the process buffer\n\
860 leaves either the character code conversion or the end-of-line conversion\n\
861 unspecified, or if the coding system used to decode the process output\n\
862 is more appropriate for saving the process buffer.\n\
864 Binding the variable `inherit-process-coding-system' to non-nil before\n\
865 starting the process is an alternative way of setting the inherit flag\n\
866 for the process which will run.")
868 register Lisp_Object process
, flag
;
870 CHECK_PROCESS (process
, 0);
871 XPROCESS (process
)->inherit_coding_system_flag
= flag
;
875 DEFUN ("process-inherit-coding-system-flag",
876 Fprocess_inherit_coding_system_flag
, Sprocess_inherit_coding_system_flag
,
878 "Return the value of inherit-coding-system flag for PROCESS.\n\
879 If this flag is t, `buffer-file-coding-system' of the buffer\n\
880 associated with PROCESS will inherit the coding system used to decode\n\
881 the process output.")
883 register Lisp_Object process
;
885 CHECK_PROCESS (process
, 0);
886 return XPROCESS (process
)->inherit_coding_system_flag
;
889 DEFUN ("process-kill-without-query", Fprocess_kill_without_query
,
890 Sprocess_kill_without_query
, 1, 2, 0,
891 "Say no query needed if PROCESS is running when Emacs is exited.\n\
892 Optional second argument if non-nil says to require a query.\n\
893 Value is t if a query was formerly required.")
895 register Lisp_Object process
, value
;
899 CHECK_PROCESS (process
, 0);
900 tem
= XPROCESS (process
)->kill_without_query
;
901 XPROCESS (process
)->kill_without_query
= Fnull (value
);
906 DEFUN ("process-contact", Fprocess_contact
, Sprocess_contact
,
908 "Return the contact info of PROCESS; t for a real child.\n\
909 For a net connection, the value is a cons cell of the form (HOST SERVICE).")
911 register Lisp_Object process
;
913 CHECK_PROCESS (process
, 0);
914 return XPROCESS (process
)->childp
;
917 #if 0 /* Turned off because we don't currently record this info
918 in the process. Perhaps add it. */
919 DEFUN ("process-connection", Fprocess_connection
, Sprocess_connection
, 1, 1, 0,
920 "Return the connection type of PROCESS.\n\
921 The value is nil for a pipe, t or `pty' for a pty, or `stream' for\n\
922 a socket connection.")
926 return XPROCESS (process
)->type
;
933 register Lisp_Object tail
, tem
;
934 Lisp_Object proc
, minspace
, tem1
;
935 register struct buffer
*old
= current_buffer
;
936 register struct Lisp_Process
*p
;
940 XSETFASTINT (minspace
, 1);
942 set_buffer_internal (XBUFFER (Vstandard_output
));
943 Fbuffer_disable_undo (Vstandard_output
);
945 current_buffer
->truncate_lines
= Qt
;
948 Proc Status Buffer Tty Command\n\
949 ---- ------ ------ --- -------\n", -1);
951 for (tail
= Vprocess_alist
; !NILP (tail
); tail
= Fcdr (tail
))
955 proc
= Fcdr (Fcar (tail
));
957 if (NILP (p
->childp
))
960 Finsert (1, &p
->name
);
961 Findent_to (make_number (13), minspace
);
963 if (!NILP (p
->raw_status_low
))
966 if (CONSP (p
->status
))
967 symbol
= XCONS (p
->status
)->car
;
970 if (EQ (symbol
, Qsignal
))
973 tem
= Fcar (Fcdr (p
->status
));
975 if (XINT (tem
) < NSIG
)
976 write_string (sys_errlist
[XINT (tem
)], -1);
979 Fprinc (symbol
, Qnil
);
981 else if (NETCONN_P (proc
))
983 if (EQ (symbol
, Qrun
))
984 write_string ("open", -1);
985 else if (EQ (symbol
, Qexit
))
986 write_string ("closed", -1);
988 Fprinc (symbol
, Qnil
);
991 Fprinc (symbol
, Qnil
);
993 if (EQ (symbol
, Qexit
))
996 tem
= Fcar (Fcdr (p
->status
));
999 sprintf (tembuf
, " %d", (int) XFASTINT (tem
));
1000 write_string (tembuf
, -1);
1004 if (EQ (symbol
, Qsignal
) || EQ (symbol
, Qexit
))
1005 remove_process (proc
);
1007 Findent_to (make_number (22), minspace
);
1008 if (NILP (p
->buffer
))
1009 insert_string ("(none)");
1010 else if (NILP (XBUFFER (p
->buffer
)->name
))
1011 insert_string ("(Killed)");
1013 Finsert (1, &XBUFFER (p
->buffer
)->name
);
1015 Findent_to (make_number (37), minspace
);
1017 if (STRINGP (p
->tty_name
))
1018 Finsert (1, &p
->tty_name
);
1020 insert_string ("(none)");
1022 Findent_to (make_number (49), minspace
);
1024 if (NETCONN_P (proc
))
1026 sprintf (tembuf
, "(network stream connection to %s)\n",
1027 XSTRING (XCONS (p
->childp
)->car
)->data
);
1028 insert_string (tembuf
);
1040 insert_string (" ");
1042 insert_string ("\n");
1048 DEFUN ("list-processes", Flist_processes
, Slist_processes
, 0, 0, "",
1049 "Display a list of all processes.\n\
1050 Any process listed as exited or signaled is actually eliminated\n\
1051 after the listing is made.")
1054 internal_with_output_to_temp_buffer ("*Process List*",
1055 list_processes_1
, Qnil
);
1059 DEFUN ("process-list", Fprocess_list
, Sprocess_list
, 0, 0, 0,
1060 "Return a list of all processes.")
1063 return Fmapcar (Qcdr
, Vprocess_alist
);
1066 /* Starting asynchronous inferior processes. */
1068 static Lisp_Object
start_process_unwind ();
1070 DEFUN ("start-process", Fstart_process
, Sstart_process
, 3, MANY
, 0,
1071 "Start a program in a subprocess. Return the process object for it.\n\
1072 Args are NAME BUFFER PROGRAM &rest PROGRAM-ARGS\n\
1073 NAME is name for process. It is modified if necessary to make it unique.\n\
1074 BUFFER is the buffer or (buffer-name) to associate with the process.\n\
1075 Process output goes at end of that buffer, unless you specify\n\
1076 an output stream or filter function to handle the output.\n\
1077 BUFFER may be also nil, meaning that this process is not associated\n\
1079 Third arg is program file name. It is searched for in PATH.\n\
1080 Remaining arguments are strings to give program as arguments.")
1083 register Lisp_Object
*args
;
1085 Lisp_Object buffer
, name
, program
, proc
, current_dir
, tem
;
1087 register unsigned char *new_argv
;
1090 register unsigned char **new_argv
;
1093 int count
= specpdl_ptr
- specpdl
;
1097 buffer
= Fget_buffer_create (buffer
);
1099 /* Make sure that the child will be able to chdir to the current
1100 buffer's current directory, or its unhandled equivalent. We
1101 can't just have the child check for an error when it does the
1102 chdir, since it's in a vfork.
1104 We have to GCPRO around this because Fexpand_file_name and
1105 Funhandled_file_name_directory might call a file name handling
1106 function. The argument list is protected by the caller, so all
1107 we really have to worry about is buffer. */
1109 struct gcpro gcpro1
, gcpro2
;
1111 current_dir
= current_buffer
->directory
;
1113 GCPRO2 (buffer
, current_dir
);
1116 = expand_and_dir_to_file (Funhandled_file_name_directory (current_dir
),
1118 if (NILP (Ffile_accessible_directory_p (current_dir
)))
1119 report_file_error ("Setting current directory",
1120 Fcons (current_buffer
->directory
, Qnil
));
1126 CHECK_STRING (name
, 0);
1130 CHECK_STRING (program
, 2);
1133 /* Make a one member argv with all args concatenated
1134 together separated by a blank. */
1135 len
= STRING_BYTES (XSTRING (program
)) + 2;
1136 for (i
= 3; i
< nargs
; i
++)
1139 CHECK_STRING (tem
, i
);
1140 len
+= STRING_BYTES (XSTRING (tem
)) + 1; /* count the blank */
1142 new_argv
= (unsigned char *) alloca (len
);
1143 strcpy (new_argv
, XSTRING (program
)->data
);
1144 for (i
= 3; i
< nargs
; i
++)
1147 CHECK_STRING (tem
, i
);
1148 strcat (new_argv
, " ");
1149 strcat (new_argv
, XSTRING (tem
)->data
);
1151 /* Need to add code here to check for program existence on VMS */
1154 new_argv
= (unsigned char **) alloca ((nargs
- 1) * sizeof (char *));
1156 /* If program file name is not absolute, search our path for it */
1157 if (!IS_DIRECTORY_SEP (XSTRING (program
)->data
[0])
1158 && !(XSTRING (program
)->size
> 1
1159 && IS_DEVICE_SEP (XSTRING (program
)->data
[1])))
1161 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
;
1164 GCPRO4 (name
, program
, buffer
, current_dir
);
1165 openp (Vexec_path
, program
, EXEC_SUFFIXES
, &tem
, 1);
1168 report_file_error ("Searching for program", Fcons (program
, Qnil
));
1169 tem
= Fexpand_file_name (tem
, Qnil
);
1170 new_argv
[0] = XSTRING (tem
)->data
;
1174 if (!NILP (Ffile_directory_p (program
)))
1175 error ("Specified program for new process is a directory");
1177 new_argv
[0] = XSTRING (program
)->data
;
1180 for (i
= 3; i
< nargs
; i
++)
1183 CHECK_STRING (tem
, i
);
1184 new_argv
[i
- 2] = XSTRING (tem
)->data
;
1186 new_argv
[i
- 2] = 0;
1187 #endif /* not VMS */
1189 proc
= make_process (name
);
1190 /* If an error occurs and we can't start the process, we want to
1191 remove it from the process list. This means that each error
1192 check in create_process doesn't need to call remove_process
1193 itself; it's all taken care of here. */
1194 record_unwind_protect (start_process_unwind
, proc
);
1196 XPROCESS (proc
)->childp
= Qt
;
1197 XPROCESS (proc
)->command_channel_p
= Qnil
;
1198 XPROCESS (proc
)->buffer
= buffer
;
1199 XPROCESS (proc
)->sentinel
= Qnil
;
1200 XPROCESS (proc
)->filter
= Qnil
;
1201 XPROCESS (proc
)->command
= Flist (nargs
- 2, args
+ 2);
1203 /* Make the process marker point into the process buffer (if any). */
1205 set_marker_both (XPROCESS (proc
)->mark
, buffer
,
1206 BUF_ZV (XBUFFER (buffer
)),
1207 BUF_ZV_BYTE (XBUFFER (buffer
)));
1210 /* Decide coding systems for communicating with the process. Here
1211 we don't setup the structure coding_system nor pay attention to
1212 unibyte mode. They are done in create_process. */
1214 /* Qt denotes we have not yet called Ffind_operation_coding_system. */
1215 Lisp_Object coding_systems
= Qt
;
1216 Lisp_Object val
, *args2
;
1217 struct gcpro gcpro1
;
1219 val
= Vcoding_system_for_read
;
1222 args2
= (Lisp_Object
*) alloca ((nargs
+ 1) * sizeof *args2
);
1223 args2
[0] = Qstart_process
;
1224 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
1226 coding_systems
= Ffind_operation_coding_system (nargs
+ 1, args2
);
1228 if (CONSP (coding_systems
))
1229 val
= XCONS (coding_systems
)->car
;
1230 else if (CONSP (Vdefault_process_coding_system
))
1231 val
= XCONS (Vdefault_process_coding_system
)->car
;
1233 XPROCESS (proc
)->decode_coding_system
= val
;
1235 val
= Vcoding_system_for_write
;
1238 if (EQ (coding_systems
, Qt
))
1240 args2
= (Lisp_Object
*) alloca ((nargs
+ 1) * sizeof args2
);
1241 args2
[0] = Qstart_process
;
1242 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
1244 coding_systems
= Ffind_operation_coding_system (nargs
+ 1, args2
);
1247 if (CONSP (coding_systems
))
1248 val
= XCONS (coding_systems
)->cdr
;
1249 else if (CONSP (Vdefault_process_coding_system
))
1250 val
= XCONS (Vdefault_process_coding_system
)->cdr
;
1252 XPROCESS (proc
)->encode_coding_system
= val
;
1255 XPROCESS (proc
)->decoding_buf
= make_uninit_string (0);
1256 XPROCESS (proc
)->decoding_carryover
= make_number (0);
1257 XPROCESS (proc
)->encoding_buf
= make_uninit_string (0);
1258 XPROCESS (proc
)->encoding_carryover
= make_number (0);
1260 XPROCESS (proc
)->inherit_coding_system_flag
1261 = (NILP (buffer
) || !inherit_process_coding_system
1264 create_process (proc
, (char **) new_argv
, current_dir
);
1266 return unbind_to (count
, proc
);
1269 /* This function is the unwind_protect form for Fstart_process. If
1270 PROC doesn't have its pid set, then we know someone has signaled
1271 an error and the process wasn't started successfully, so we should
1272 remove it from the process list. */
1274 start_process_unwind (proc
)
1277 if (!PROCESSP (proc
))
1280 /* Was PROC started successfully? */
1281 if (XINT (XPROCESS (proc
)->pid
) <= 0)
1282 remove_process (proc
);
1289 create_process_1 (signo
)
1292 #if defined (USG) && !defined (POSIX_SIGNALS)
1293 /* USG systems forget handlers when they are used;
1294 must reestablish each time */
1295 signal (signo
, create_process_1
);
1299 #if 0 /* This doesn't work; see the note before sigchld_handler. */
1302 /* Mimic blocking of signals on system V, which doesn't really have it. */
1304 /* Nonzero means we got a SIGCHLD when it was supposed to be blocked. */
1305 int sigchld_deferred
;
1308 create_process_sigchld ()
1310 signal (SIGCHLD
, create_process_sigchld
);
1312 sigchld_deferred
= 1;
1318 #ifndef VMS /* VMS version of this function is in vmsproc.c. */
1320 create_process (process
, new_argv
, current_dir
)
1321 Lisp_Object process
;
1323 Lisp_Object current_dir
;
1325 int pid
, inchannel
, outchannel
;
1327 #ifdef POSIX_SIGNALS
1330 struct sigaction sigint_action
;
1331 struct sigaction sigquit_action
;
1333 struct sigaction sighup_action
;
1335 #else /* !POSIX_SIGNALS */
1337 SIGTYPE (*sigchld
)();
1339 #endif /* !POSIX_SIGNALS */
1340 /* Use volatile to protect variables from being clobbered by longjmp. */
1341 volatile int forkin
, forkout
;
1342 volatile int pty_flag
= 0;
1343 extern char **environ
;
1344 Lisp_Object buffer
= XPROCESS (process
)->buffer
;
1346 inchannel
= outchannel
= -1;
1349 if (!NILP (Vprocess_connection_type
))
1350 outchannel
= inchannel
= allocate_pty ();
1355 /* On USG systems it does not work to open the pty's tty here
1356 and then close and reopen it in the child. */
1358 /* Don't let this terminal become our controlling terminal
1359 (in case we don't have one). */
1360 forkout
= forkin
= open (pty_name
, O_RDWR
| O_NOCTTY
, 0);
1362 forkout
= forkin
= open (pty_name
, O_RDWR
, 0);
1365 report_file_error ("Opening pty", Qnil
);
1367 forkin
= forkout
= -1;
1368 #endif /* not USG */
1372 #endif /* HAVE_PTYS */
1375 if (socketpair (AF_UNIX
, SOCK_STREAM
, 0, sv
) < 0)
1376 report_file_error ("Opening socketpair", Qnil
);
1377 outchannel
= inchannel
= sv
[0];
1378 forkout
= forkin
= sv
[1];
1380 #else /* not SKTPAIR */
1389 #endif /* not SKTPAIR */
1392 /* Replaced by close_process_descs */
1393 set_exclusive_use (inchannel
);
1394 set_exclusive_use (outchannel
);
1397 /* Stride people say it's a mystery why this is needed
1398 as well as the O_NDELAY, but that it fails without this. */
1399 #if defined (STRIDE) || (defined (pfa) && defined (HAVE_PTYS))
1402 ioctl (inchannel
, FIONBIO
, &one
);
1407 fcntl (inchannel
, F_SETFL
, O_NONBLOCK
);
1408 fcntl (outchannel
, F_SETFL
, O_NONBLOCK
);
1411 fcntl (inchannel
, F_SETFL
, O_NDELAY
);
1412 fcntl (outchannel
, F_SETFL
, O_NDELAY
);
1416 /* Record this as an active process, with its channels.
1417 As a result, child_setup will close Emacs's side of the pipes. */
1418 chan_process
[inchannel
] = process
;
1419 XSETINT (XPROCESS (process
)->infd
, inchannel
);
1420 XSETINT (XPROCESS (process
)->outfd
, outchannel
);
1421 /* Record the tty descriptor used in the subprocess. */
1423 XPROCESS (process
)->subtty
= Qnil
;
1425 XSETFASTINT (XPROCESS (process
)->subtty
, forkin
);
1426 XPROCESS (process
)->pty_flag
= (pty_flag
? Qt
: Qnil
);
1427 XPROCESS (process
)->status
= Qrun
;
1428 if (!proc_decode_coding_system
[inchannel
])
1429 proc_decode_coding_system
[inchannel
]
1430 = (struct coding_system
*) xmalloc (sizeof (struct coding_system
));
1431 setup_coding_system (XPROCESS (process
)->decode_coding_system
,
1432 proc_decode_coding_system
[inchannel
]);
1433 if (!proc_encode_coding_system
[outchannel
])
1434 proc_encode_coding_system
[outchannel
]
1435 = (struct coding_system
*) xmalloc (sizeof (struct coding_system
));
1436 setup_coding_system (XPROCESS (process
)->encode_coding_system
,
1437 proc_encode_coding_system
[outchannel
]);
1439 if (!NILP (buffer
) && NILP (XBUFFER (buffer
)->enable_multibyte_characters
)
1440 || (NILP (buffer
) && NILP (buffer_defaults
.enable_multibyte_characters
)))
1442 /* In unibyte mode, character code conversion should not take
1443 place but EOL conversion should. So, setup raw-text or one
1444 of the subsidiary according to the information just setup. */
1445 if (!NILP (XPROCESS (process
)->decode_coding_system
))
1446 setup_raw_text_coding_system (proc_decode_coding_system
[inchannel
]);
1447 if (!NILP (XPROCESS (process
)->encode_coding_system
))
1448 setup_raw_text_coding_system (proc_encode_coding_system
[outchannel
]);
1451 if (CODING_REQUIRE_ENCODING (proc_encode_coding_system
[outchannel
]))
1453 /* Here we encode arguments by the coding system used for
1454 sending data to the process. We don't support using
1455 different coding systems for encoding arguments and for
1456 encoding data sent to the process. */
1457 struct gcpro gcpro1
;
1459 struct coding_system
*coding
= proc_encode_coding_system
[outchannel
];
1461 coding
->mode
|= CODING_MODE_LAST_BLOCK
;
1463 while (new_argv
[i
] != 0)
1465 int len
= strlen (new_argv
[i
]);
1466 int size
= encoding_buffer_size (coding
, len
);
1467 unsigned char *buf
= (unsigned char *) alloca (size
);
1469 encode_coding (coding
, (unsigned char *)new_argv
[i
], buf
, len
, size
);
1470 buf
[coding
->produced
] = 0;
1471 /* We don't have to free new_argv[i] because it points to a
1472 Lisp string given as an argument to `start-process'. */
1473 new_argv
[i
++] = (char *) buf
;
1476 coding
->mode
&= ~CODING_MODE_LAST_BLOCK
;
1479 /* Delay interrupts until we have a chance to store
1480 the new fork's pid in its process structure */
1481 #ifdef POSIX_SIGNALS
1482 sigemptyset (&blocked
);
1484 sigaddset (&blocked
, SIGCHLD
);
1487 /* On many hosts (e.g. Solaris 2.4), if a vforked child calls `signal',
1488 this sets the parent's signal handlers as well as the child's.
1489 So delay all interrupts whose handlers the child might munge,
1490 and record the current handlers so they can be restored later. */
1491 sigaddset (&blocked
, SIGINT
); sigaction (SIGINT
, 0, &sigint_action
);
1492 sigaddset (&blocked
, SIGQUIT
); sigaction (SIGQUIT
, 0, &sigquit_action
);
1494 sigaddset (&blocked
, SIGHUP
); sigaction (SIGHUP
, 0, &sighup_action
);
1496 #endif /* HAVE_VFORK */
1497 sigprocmask (SIG_BLOCK
, &blocked
, &procmask
);
1498 #else /* !POSIX_SIGNALS */
1502 #else /* not BSD4_1 */
1503 #if defined (BSD_SYSTEM) || defined (UNIPLUS) || defined (HPUX)
1504 sigsetmask (sigmask (SIGCHLD
));
1505 #else /* ordinary USG */
1507 sigchld_deferred
= 0;
1508 sigchld
= signal (SIGCHLD
, create_process_sigchld
);
1510 #endif /* ordinary USG */
1511 #endif /* not BSD4_1 */
1512 #endif /* SIGCHLD */
1513 #endif /* !POSIX_SIGNALS */
1515 FD_SET (inchannel
, &input_wait_mask
);
1516 FD_SET (inchannel
, &non_keyboard_wait_mask
);
1517 if (inchannel
> max_process_desc
)
1518 max_process_desc
= inchannel
;
1520 /* Until we store the proper pid, enable sigchld_handler
1521 to recognize an unknown pid as standing for this process.
1522 It is very important not to let this `marker' value stay
1523 in the table after this function has returned; if it does
1524 it might cause call-process to hang and subsequent asynchronous
1525 processes to get their return values scrambled. */
1526 XSETINT (XPROCESS (process
)->pid
, -1);
1531 /* child_setup must clobber environ on systems with true vfork.
1532 Protect it from permanent change. */
1533 char **save_environ
= environ
;
1535 current_dir
= ENCODE_FILE (current_dir
);
1540 #endif /* not WINDOWSNT */
1542 int xforkin
= forkin
;
1543 int xforkout
= forkout
;
1545 #if 0 /* This was probably a mistake--it duplicates code later on,
1546 but fails to handle all the cases. */
1547 /* Make sure SIGCHLD is not blocked in the child. */
1548 sigsetmask (SIGEMPTYMASK
);
1551 /* Make the pty be the controlling terminal of the process. */
1553 /* First, disconnect its current controlling terminal. */
1555 /* We tried doing setsid only if pty_flag, but it caused
1556 process_set_signal to fail on SGI when using a pipe. */
1558 /* Make the pty's terminal the controlling terminal. */
1562 /* We ignore the return value
1563 because faith@cs.unc.edu says that is necessary on Linux. */
1564 ioctl (xforkin
, TIOCSCTTY
, 0);
1567 #else /* not HAVE_SETSID */
1569 /* It's very important to call setpgrp here and no time
1570 afterwards. Otherwise, we lose our controlling tty which
1571 is set when we open the pty. */
1574 #endif /* not HAVE_SETSID */
1575 #if defined (HAVE_TERMIOS) && defined (LDISC1)
1576 if (pty_flag
&& xforkin
>= 0)
1579 tcgetattr (xforkin
, &t
);
1581 if (tcsetattr (xforkin
, TCSANOW
, &t
) < 0)
1582 write (1, "create_process/tcsetattr LDISC1 failed\n", 39);
1585 #if defined (NTTYDISC) && defined (TIOCSETD)
1586 if (pty_flag
&& xforkin
>= 0)
1588 /* Use new line discipline. */
1589 int ldisc
= NTTYDISC
;
1590 ioctl (xforkin
, TIOCSETD
, &ldisc
);
1595 /* In 4.3BSD, the TIOCSPGRP bug has been fixed, and now you
1596 can do TIOCSPGRP only to the process's controlling tty. */
1599 /* I wonder: would just ioctl (0, TIOCNOTTY, 0) work here?
1600 I can't test it since I don't have 4.3. */
1601 int j
= open ("/dev/tty", O_RDWR
, 0);
1602 ioctl (j
, TIOCNOTTY
, 0);
1605 /* In order to get a controlling terminal on some versions
1606 of BSD, it is necessary to put the process in pgrp 0
1607 before it opens the terminal. */
1615 #endif /* TIOCNOTTY */
1617 #if !defined (RTU) && !defined (UNIPLUS) && !defined (DONT_REOPEN_PTY)
1618 /*** There is a suggestion that this ought to be a
1619 conditional on TIOCSPGRP,
1620 or !(defined (HAVE_SETSID) && defined (TIOCSCTTY)).
1621 Trying the latter gave the wrong results on Debian GNU/Linux 1.1;
1622 that system does seem to need this code, even though
1623 both HAVE_SETSID and TIOCSCTTY are defined. */
1624 /* Now close the pty (if we had it open) and reopen it.
1625 This makes the pty the controlling terminal of the subprocess. */
1628 #ifdef SET_CHILD_PTY_PGRP
1629 int pgrp
= getpid ();
1632 /* I wonder if close (open (pty_name, ...)) would work? */
1635 xforkout
= xforkin
= open (pty_name
, O_RDWR
, 0);
1639 write (1, "Couldn't open the pty terminal ", 31);
1640 write (1, pty_name
, strlen (pty_name
));
1645 #ifdef SET_CHILD_PTY_PGRP
1646 ioctl (xforkin
, TIOCSPGRP
, &pgrp
);
1647 ioctl (xforkout
, TIOCSPGRP
, &pgrp
);
1650 #endif /* not UNIPLUS and not RTU and not DONT_REOPEN_PTY */
1652 #ifdef SETUP_SLAVE_PTY
1657 #endif /* SETUP_SLAVE_PTY */
1659 /* On AIX, we've disabled SIGHUP above once we start a child on a pty.
1660 Now reenable it in the child, so it will die when we want it to. */
1662 signal (SIGHUP
, SIG_DFL
);
1664 #endif /* HAVE_PTYS */
1666 signal (SIGINT
, SIG_DFL
);
1667 signal (SIGQUIT
, SIG_DFL
);
1669 /* Stop blocking signals in the child. */
1670 #ifdef POSIX_SIGNALS
1671 sigprocmask (SIG_SETMASK
, &procmask
, 0);
1672 #else /* !POSIX_SIGNALS */
1676 #else /* not BSD4_1 */
1677 #if defined (BSD_SYSTEM) || defined (UNIPLUS) || defined (HPUX)
1678 sigsetmask (SIGEMPTYMASK
);
1679 #else /* ordinary USG */
1681 signal (SIGCHLD
, sigchld
);
1683 #endif /* ordinary USG */
1684 #endif /* not BSD4_1 */
1685 #endif /* SIGCHLD */
1686 #endif /* !POSIX_SIGNALS */
1689 child_setup_tty (xforkout
);
1691 pid
= child_setup (xforkin
, xforkout
, xforkout
,
1692 new_argv
, 1, current_dir
);
1693 #else /* not WINDOWSNT */
1694 child_setup (xforkin
, xforkout
, xforkout
,
1695 new_argv
, 1, current_dir
);
1696 #endif /* not WINDOWSNT */
1698 environ
= save_environ
;
1703 /* This runs in the Emacs process. */
1708 if (forkin
!= forkout
&& forkout
>= 0)
1713 /* vfork succeeded. */
1714 XSETFASTINT (XPROCESS (process
)->pid
, pid
);
1717 register_child (pid
, inchannel
);
1718 #endif /* WINDOWSNT */
1720 /* If the subfork execv fails, and it exits,
1721 this close hangs. I don't know why.
1722 So have an interrupt jar it loose. */
1724 signal (SIGALRM
, create_process_1
);
1726 XPROCESS (process
)->subtty
= Qnil
;
1731 if (forkin
!= forkout
&& forkout
>= 0)
1736 XPROCESS (process
)->tty_name
= build_string (pty_name
);
1739 XPROCESS (process
)->tty_name
= Qnil
;
1742 /* Restore the signal state whether vfork succeeded or not.
1743 (We will signal an error, below, if it failed.) */
1744 #ifdef POSIX_SIGNALS
1746 /* Restore the parent's signal handlers. */
1747 sigaction (SIGINT
, &sigint_action
, 0);
1748 sigaction (SIGQUIT
, &sigquit_action
, 0);
1750 sigaction (SIGHUP
, &sighup_action
, 0);
1752 #endif /* HAVE_VFORK */
1753 /* Stop blocking signals in the parent. */
1754 sigprocmask (SIG_SETMASK
, &procmask
, 0);
1755 #else /* !POSIX_SIGNALS */
1759 #else /* not BSD4_1 */
1760 #if defined (BSD_SYSTEM) || defined (UNIPLUS) || defined (HPUX)
1761 sigsetmask (SIGEMPTYMASK
);
1762 #else /* ordinary USG */
1764 signal (SIGCHLD
, sigchld
);
1765 /* Now really handle any of these signals
1766 that came in during this function. */
1767 if (sigchld_deferred
)
1768 kill (getpid (), SIGCHLD
);
1770 #endif /* ordinary USG */
1771 #endif /* not BSD4_1 */
1772 #endif /* SIGCHLD */
1773 #endif /* !POSIX_SIGNALS */
1775 /* Now generate the error if vfork failed. */
1777 report_file_error ("Doing vfork", Qnil
);
1779 #endif /* not VMS */
1783 /* open a TCP network connection to a given HOST/SERVICE. Treated
1784 exactly like a normal process when reading and writing. Only
1785 differences are in status display and process deletion. A network
1786 connection has no PID; you cannot signal it. All you can do is
1787 deactivate and close it via delete-process */
1789 DEFUN ("open-network-stream", Fopen_network_stream
, Sopen_network_stream
,
1791 "Open a TCP connection for a service to a host.\n\
1792 Returns a subprocess-object to represent the connection.\n\
1793 Input and output work as for subprocesses; `delete-process' closes it.\n\
1794 Args are NAME BUFFER HOST SERVICE.\n\
1795 NAME is name for process. It is modified if necessary to make it unique.\n\
1796 BUFFER is the buffer (or buffer-name) to associate with the process.\n\
1797 Process output goes at end of that buffer, unless you specify\n\
1798 an output stream or filter function to handle the output.\n\
1799 BUFFER may be also nil, meaning that this process is not associated\n\
1801 Third arg is name of the host to connect to, or its IP address.\n\
1802 Fourth arg SERVICE is name of the service desired, or an integer\n\
1803 specifying a port number to connect to.")
1804 (name
, buffer
, host
, service
)
1805 Lisp_Object name
, buffer
, host
, service
;
1809 struct sockaddr_in address
;
1810 struct servent
*svc_info
;
1811 struct hostent
*host_info_ptr
, host_info
;
1812 char *(addr_list
[2]);
1813 IN_ADDR numeric_addr
;
1817 struct hostent host_info_fixed
;
1818 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
;
1820 int count
= specpdl_ptr
- specpdl
;
1823 /* Ensure socket support is loaded if available. */
1824 init_winsock (TRUE
);
1827 GCPRO4 (name
, buffer
, host
, service
);
1828 CHECK_STRING (name
, 0);
1829 CHECK_STRING (host
, 0);
1830 if (INTEGERP (service
))
1831 port
= htons ((unsigned short) XINT (service
));
1834 CHECK_STRING (service
, 0);
1835 svc_info
= getservbyname (XSTRING (service
)->data
, "tcp");
1837 error ("Unknown service \"%s\"", XSTRING (service
)->data
);
1838 port
= svc_info
->s_port
;
1841 /* Slow down polling to every ten seconds.
1842 Some kernels have a bug which causes retrying connect to fail
1843 after a connect. Polling can interfere with gethostbyname too. */
1844 #ifdef POLL_FOR_INPUT
1845 bind_polling_period (10);
1856 host_info_ptr
= gethostbyname (XSTRING (host
)->data
);
1859 if (! (host_info_ptr
== 0 && h_errno
== TRY_AGAIN
))
1862 Fsleep_for (make_number (1), Qnil
);
1864 if (host_info_ptr
== 0)
1865 /* Attempt to interpret host as numeric inet address */
1867 numeric_addr
= inet_addr ((char *) XSTRING (host
)->data
);
1868 if (NUMERIC_ADDR_ERROR
)
1869 error ("Unknown host \"%s\"", XSTRING (host
)->data
);
1871 host_info_ptr
= &host_info
;
1872 host_info
.h_name
= 0;
1873 host_info
.h_aliases
= 0;
1874 host_info
.h_addrtype
= AF_INET
;
1876 /* Older machines have only one address slot called h_addr.
1877 Newer machines have h_addr_list, but #define h_addr to
1878 be its first element. */
1879 host_info
.h_addr_list
= &(addr_list
[0]);
1881 host_info
.h_addr
= (char*)(&numeric_addr
);
1883 /* numeric_addr isn't null-terminated; it has fixed length. */
1884 host_info
.h_length
= sizeof (numeric_addr
);
1887 bzero (&address
, sizeof address
);
1888 bcopy (host_info_ptr
->h_addr
, (char *) &address
.sin_addr
,
1889 host_info_ptr
->h_length
);
1890 address
.sin_family
= host_info_ptr
->h_addrtype
;
1891 address
.sin_port
= port
;
1893 s
= socket (host_info_ptr
->h_addrtype
, SOCK_STREAM
, 0);
1895 report_file_error ("error creating socket", Fcons (name
, Qnil
));
1897 /* Kernel bugs (on Ultrix at least) cause lossage (not just EINTR)
1898 when connect is interrupted. So let's not let it get interrupted.
1899 Note we do not turn off polling, because polling is only used
1900 when not interrupt_input, and thus not normally used on the systems
1901 which have this bug. On systems which use polling, there's no way
1902 to quit if polling is turned off. */
1903 if (interrupt_input
)
1911 if (connect (s
, (struct sockaddr
*) &address
, sizeof address
) == -1
1912 && errno
!= EISCONN
)
1920 if (errno
== EADDRINUSE
&& retry
< 20)
1922 /* A delay here is needed on some FreeBSD systems,
1923 and it is harmless, since this retrying takes time anyway
1924 and should be infrequent. */
1925 Fsleep_for (make_number (1), Qnil
);
1932 if (interrupt_input
)
1936 report_file_error ("connection failed",
1937 Fcons (host
, Fcons (name
, Qnil
)));
1942 #ifdef POLL_FOR_INPUT
1943 unbind_to (count
, Qnil
);
1946 if (interrupt_input
)
1950 s
= connect_server (0);
1952 report_file_error ("error creating socket", Fcons (name
, Qnil
));
1953 send_command (s
, C_PORT
, 0, "%s:%d", XSTRING (host
)->data
, ntohs (port
));
1954 send_command (s
, C_DUMB
, 1, 0);
1961 buffer
= Fget_buffer_create (buffer
);
1962 proc
= make_process (name
);
1964 chan_process
[inch
] = proc
;
1967 fcntl (inch
, F_SETFL
, O_NONBLOCK
);
1970 fcntl (inch
, F_SETFL
, O_NDELAY
);
1974 XPROCESS (proc
)->childp
= Fcons (host
, Fcons (service
, Qnil
));
1975 XPROCESS (proc
)->command_channel_p
= Qnil
;
1976 XPROCESS (proc
)->buffer
= buffer
;
1977 XPROCESS (proc
)->sentinel
= Qnil
;
1978 XPROCESS (proc
)->filter
= Qnil
;
1979 XPROCESS (proc
)->command
= Qnil
;
1980 XPROCESS (proc
)->pid
= Qnil
;
1981 XSETINT (XPROCESS (proc
)->infd
, inch
);
1982 XSETINT (XPROCESS (proc
)->outfd
, outch
);
1983 XPROCESS (proc
)->status
= Qrun
;
1984 FD_SET (inch
, &input_wait_mask
);
1985 FD_SET (inch
, &non_keyboard_wait_mask
);
1986 if (inch
> max_process_desc
)
1987 max_process_desc
= inch
;
1990 /* Setup coding systems for communicating with the network stream. */
1991 struct gcpro gcpro1
;
1992 /* Qt denotes we have not yet called Ffind_operation_coding_system. */
1993 Lisp_Object coding_systems
= Qt
;
1994 Lisp_Object args
[5], val
;
1996 if (!NILP (Vcoding_system_for_read
))
1997 val
= Vcoding_system_for_read
;
1998 else if (!NILP (buffer
) && NILP (XBUFFER (buffer
)->enable_multibyte_characters
)
1999 || NILP (buffer
) && NILP (buffer_defaults
.enable_multibyte_characters
))
2000 /* We dare not decode end-of-line format by setting VAL to
2001 Qraw_text, because the existing Emacs Lisp libraries
2002 assume that they receive bare code including a sequene of
2007 args
[0] = Qopen_network_stream
, args
[1] = name
,
2008 args
[2] = buffer
, args
[3] = host
, args
[4] = service
;
2010 coding_systems
= Ffind_operation_coding_system (5, args
);
2012 if (CONSP (coding_systems
))
2013 val
= XCONS (coding_systems
)->car
;
2014 else if (CONSP (Vdefault_process_coding_system
))
2015 val
= XCONS (Vdefault_process_coding_system
)->car
;
2019 XPROCESS (proc
)->decode_coding_system
= val
;
2021 if (!NILP (Vcoding_system_for_write
))
2022 val
= Vcoding_system_for_write
;
2023 else if (NILP (current_buffer
->enable_multibyte_characters
))
2027 if (EQ (coding_systems
, Qt
))
2029 args
[0] = Qopen_network_stream
, args
[1] = name
,
2030 args
[2] = buffer
, args
[3] = host
, args
[4] = service
;
2032 coding_systems
= Ffind_operation_coding_system (5, args
);
2035 if (CONSP (coding_systems
))
2036 val
= XCONS (coding_systems
)->cdr
;
2037 else if (CONSP (Vdefault_process_coding_system
))
2038 val
= XCONS (Vdefault_process_coding_system
)->cdr
;
2042 XPROCESS (proc
)->encode_coding_system
= val
;
2045 if (!proc_decode_coding_system
[inch
])
2046 proc_decode_coding_system
[inch
]
2047 = (struct coding_system
*) xmalloc (sizeof (struct coding_system
));
2048 setup_coding_system (XPROCESS (proc
)->decode_coding_system
,
2049 proc_decode_coding_system
[inch
]);
2050 if (!proc_encode_coding_system
[outch
])
2051 proc_encode_coding_system
[outch
]
2052 = (struct coding_system
*) xmalloc (sizeof (struct coding_system
));
2053 setup_coding_system (XPROCESS (proc
)->encode_coding_system
,
2054 proc_encode_coding_system
[outch
]);
2056 XPROCESS (proc
)->decoding_buf
= make_uninit_string (0);
2057 XPROCESS (proc
)->decoding_carryover
= make_number (0);
2058 XPROCESS (proc
)->encoding_buf
= make_uninit_string (0);
2059 XPROCESS (proc
)->encoding_carryover
= make_number (0);
2061 XPROCESS (proc
)->inherit_coding_system_flag
2062 = (NILP (buffer
) || !inherit_process_coding_system
2068 #endif /* HAVE_SOCKETS */
2071 deactivate_process (proc
)
2074 register int inchannel
, outchannel
;
2075 register struct Lisp_Process
*p
= XPROCESS (proc
);
2077 inchannel
= XINT (p
->infd
);
2078 outchannel
= XINT (p
->outfd
);
2082 /* Beware SIGCHLD hereabouts. */
2083 flush_pending_output (inchannel
);
2086 VMS_PROC_STUFF
*get_vms_process_pointer (), *vs
;
2087 sys$
dassgn (outchannel
);
2088 vs
= get_vms_process_pointer (p
->pid
);
2090 give_back_vms_process_stuff (vs
);
2094 if (outchannel
>= 0 && outchannel
!= inchannel
)
2098 XSETINT (p
->infd
, -1);
2099 XSETINT (p
->outfd
, -1);
2100 chan_process
[inchannel
] = Qnil
;
2101 FD_CLR (inchannel
, &input_wait_mask
);
2102 FD_CLR (inchannel
, &non_keyboard_wait_mask
);
2103 if (inchannel
== max_process_desc
)
2106 /* We just closed the highest-numbered process input descriptor,
2107 so recompute the highest-numbered one now. */
2108 max_process_desc
= 0;
2109 for (i
= 0; i
< MAXDESC
; i
++)
2110 if (!NILP (chan_process
[i
]))
2111 max_process_desc
= i
;
2116 /* Close all descriptors currently in use for communication
2117 with subprocess. This is used in a newly-forked subprocess
2118 to get rid of irrelevant descriptors. */
2121 close_process_descs ()
2125 for (i
= 0; i
< MAXDESC
; i
++)
2127 Lisp_Object process
;
2128 process
= chan_process
[i
];
2129 if (!NILP (process
))
2131 int in
= XINT (XPROCESS (process
)->infd
);
2132 int out
= XINT (XPROCESS (process
)->outfd
);
2135 if (out
>= 0 && in
!= out
)
2142 DEFUN ("accept-process-output", Faccept_process_output
, Saccept_process_output
,
2144 "Allow any pending output from subprocesses to be read by Emacs.\n\
2145 It is read into the process' buffers or given to their filter functions.\n\
2146 Non-nil arg PROCESS means do not return until some output has been received\n\
2148 Non-nil second arg TIMEOUT and third arg TIMEOUT-MSECS are number of\n\
2149 seconds and microseconds to wait; return after that much time whether\n\
2150 or not there is input.\n\
2151 Return non-nil iff we received any output before the timeout expired.")
2152 (process
, timeout
, timeout_msecs
)
2153 register Lisp_Object process
, timeout
, timeout_msecs
;
2158 if (! NILP (process
))
2159 CHECK_PROCESS (process
, 0);
2161 if (! NILP (timeout_msecs
))
2163 CHECK_NUMBER (timeout_msecs
, 2);
2164 useconds
= XINT (timeout_msecs
);
2165 if (!INTEGERP (timeout
))
2166 XSETINT (timeout
, 0);
2169 int carry
= useconds
/ 1000000;
2171 XSETINT (timeout
, XINT (timeout
) + carry
);
2172 useconds
-= carry
* 1000000;
2174 /* I think this clause is necessary because C doesn't
2175 guarantee a particular rounding direction for negative
2179 XSETINT (timeout
, XINT (timeout
) - 1);
2180 useconds
+= 1000000;
2187 if (! NILP (timeout
))
2189 CHECK_NUMBER (timeout
, 1);
2190 seconds
= XINT (timeout
);
2191 if (seconds
< 0 || (seconds
== 0 && useconds
== 0))
2203 XSETFASTINT (process
, 0);
2206 (wait_reading_process_input (seconds
, useconds
, process
, 0)
2210 /* This variable is different from waiting_for_input in keyboard.c.
2211 It is used to communicate to a lisp process-filter/sentinel (via the
2212 function Fwaiting_for_user_input_p below) whether emacs was waiting
2213 for user-input when that process-filter was called.
2214 waiting_for_input cannot be used as that is by definition 0 when
2215 lisp code is being evalled.
2216 This is also used in record_asynch_buffer_change.
2217 For that purpose, this must be 0
2218 when not inside wait_reading_process_input. */
2219 static int waiting_for_user_input_p
;
2221 /* This is here so breakpoints can be put on it. */
2223 wait_reading_process_input_1 ()
2227 /* Read and dispose of subprocess output while waiting for timeout to
2228 elapse and/or keyboard input to be available.
2231 timeout in seconds, or
2232 zero for no limit, or
2233 -1 means gobble data immediately available but don't wait for any.
2236 an additional duration to wait, measured in microseconds.
2237 If this is nonzero and time_limit is 0, then the timeout
2238 consists of MICROSECS only.
2240 READ_KBD is a lisp value:
2241 0 to ignore keyboard input, or
2242 1 to return when input is available, or
2243 -1 meaning caller will actually read the input, so don't throw to
2244 the quit handler, or
2245 a cons cell, meaning wait until its car is non-nil
2246 (and gobble terminal input into the buffer if any arrives), or
2247 a process object, meaning wait until something arrives from that
2248 process. The return value is true iff we read some input from
2251 DO_DISPLAY != 0 means redisplay should be done to show subprocess
2252 output that arrives.
2254 If READ_KBD is a pointer to a struct Lisp_Process, then the
2255 function returns true iff we received input from that process
2256 before the timeout elapsed.
2257 Otherwise, return true iff we received input from any process. */
2260 wait_reading_process_input (time_limit
, microsecs
, read_kbd
, do_display
)
2261 int time_limit
, microsecs
;
2262 Lisp_Object read_kbd
;
2265 register int channel
, nfds
, m
;
2266 static SELECT_TYPE Available
;
2269 EMACS_TIME timeout
, end_time
, garbage
;
2271 int wait_channel
= -1;
2272 struct Lisp_Process
*wait_proc
= 0;
2273 int got_some_input
= 0;
2274 Lisp_Object
*wait_for_cell
= 0;
2276 FD_ZERO (&Available
);
2278 /* If read_kbd is a process to watch, set wait_proc and wait_channel
2280 if (PROCESSP (read_kbd
))
2282 wait_proc
= XPROCESS (read_kbd
);
2283 wait_channel
= XINT (wait_proc
->infd
);
2284 XSETFASTINT (read_kbd
, 0);
2287 /* If waiting for non-nil in a cell, record where. */
2288 if (CONSP (read_kbd
))
2290 wait_for_cell
= &XCONS (read_kbd
)->car
;
2291 XSETFASTINT (read_kbd
, 0);
2294 waiting_for_user_input_p
= XINT (read_kbd
);
2296 /* Since we may need to wait several times,
2297 compute the absolute time to return at. */
2298 if (time_limit
|| microsecs
)
2300 EMACS_GET_TIME (end_time
);
2301 EMACS_SET_SECS_USECS (timeout
, time_limit
, microsecs
);
2302 EMACS_ADD_TIME (end_time
, end_time
, timeout
);
2305 /* AlainF 5-Jul-1996
2306 HP-UX 10.10 seem to have problems with signals coming in
2307 Causes "poll: interrupted system call" messages when Emacs is run
2309 Turn off periodic alarms (in case they are in use) */
2315 int timeout_reduced_for_timers
= 0;
2317 #ifdef HAVE_X_WINDOWS
2318 if (display_busy_cursor_p
)
2319 Fx_hide_busy_cursor (Qnil
);
2322 /* If calling from keyboard input, do not quit
2323 since we want to return C-g as an input character.
2324 Otherwise, do pending quit if requested. */
2325 if (XINT (read_kbd
) >= 0)
2328 /* Exit now if the cell we're waiting for became non-nil. */
2329 if (wait_for_cell
&& ! NILP (*wait_for_cell
))
2332 /* Compute time from now till when time limit is up */
2333 /* Exit if already run out */
2334 if (time_limit
== -1)
2336 /* -1 specified for timeout means
2337 gobble output available now
2338 but don't wait at all. */
2340 EMACS_SET_SECS_USECS (timeout
, 0, 0);
2342 else if (time_limit
|| microsecs
)
2344 EMACS_GET_TIME (timeout
);
2345 EMACS_SUB_TIME (timeout
, end_time
, timeout
);
2346 if (EMACS_TIME_NEG_P (timeout
))
2351 EMACS_SET_SECS_USECS (timeout
, 100000, 0);
2354 /* Normally we run timers here.
2355 But not if wait_for_cell; in those cases,
2356 the wait is supposed to be short,
2357 and those callers cannot handle running arbitrary Lisp code here. */
2358 if (! wait_for_cell
)
2360 EMACS_TIME timer_delay
;
2364 old_timers_run
= timers_run
;
2365 timer_delay
= timer_check (1);
2366 if (timers_run
!= old_timers_run
&& do_display
)
2368 redisplay_preserve_echo_area ();
2369 /* We must retry, since a timer may have requeued itself
2370 and that could alter the time_delay. */
2374 /* If there is unread keyboard input, also return. */
2375 if (XINT (read_kbd
) != 0
2376 && requeued_events_pending_p ())
2379 if (! EMACS_TIME_NEG_P (timer_delay
) && time_limit
!= -1)
2381 EMACS_TIME difference
;
2382 EMACS_SUB_TIME (difference
, timer_delay
, timeout
);
2383 if (EMACS_TIME_NEG_P (difference
))
2385 timeout
= timer_delay
;
2386 timeout_reduced_for_timers
= 1;
2389 /* If time_limit is -1, we are not going to wait at all. */
2390 else if (time_limit
!= -1)
2392 /* This is so a breakpoint can be put here. */
2393 wait_reading_process_input_1 ();
2397 /* Cause C-g and alarm signals to take immediate action,
2398 and cause input available signals to zero out timeout.
2400 It is important that we do this before checking for process
2401 activity. If we get a SIGCHLD after the explicit checks for
2402 process activity, timeout is the only way we will know. */
2403 if (XINT (read_kbd
) < 0)
2404 set_waiting_for_input (&timeout
);
2406 /* If status of something has changed, and no input is
2407 available, notify the user of the change right away. After
2408 this explicit check, we'll let the SIGCHLD handler zap
2409 timeout to get our attention. */
2410 if (update_tick
!= process_tick
&& do_display
)
2412 Atemp
= input_wait_mask
;
2413 EMACS_SET_SECS_USECS (timeout
, 0, 0);
2414 if ((select (max (max_process_desc
, max_keyboard_desc
) + 1,
2415 &Atemp
, (SELECT_TYPE
*)0, (SELECT_TYPE
*)0,
2419 /* It's okay for us to do this and then continue with
2420 the loop, since timeout has already been zeroed out. */
2421 clear_waiting_for_input ();
2426 /* Don't wait for output from a non-running process. */
2427 if (wait_proc
!= 0 && !NILP (wait_proc
->raw_status_low
))
2428 update_status (wait_proc
);
2430 && ! EQ (wait_proc
->status
, Qrun
))
2432 int nread
, total_nread
= 0;
2434 clear_waiting_for_input ();
2435 XSETPROCESS (proc
, wait_proc
);
2437 /* Read data from the process, until we exhaust it. */
2438 while (XINT (wait_proc
->infd
) >= 0
2440 = read_process_output (proc
, XINT (wait_proc
->infd
))))
2443 total_nread
+= nread
;
2445 else if (nread
== -1 && EIO
== errno
)
2449 if (total_nread
> 0 && do_display
)
2450 redisplay_preserve_echo_area ();
2455 /* Wait till there is something to do */
2458 Available
= non_process_wait_mask
;
2459 else if (! XINT (read_kbd
))
2460 Available
= non_keyboard_wait_mask
;
2462 Available
= input_wait_mask
;
2464 /* If frame size has changed or the window is newly mapped,
2465 redisplay now, before we start to wait. There is a race
2466 condition here; if a SIGIO arrives between now and the select
2467 and indicates that a frame is trashed, the select may block
2468 displaying a trashed screen. */
2469 if (frame_garbaged
&& do_display
)
2471 clear_waiting_for_input ();
2472 redisplay_preserve_echo_area ();
2473 if (XINT (read_kbd
) < 0)
2474 set_waiting_for_input (&timeout
);
2477 if (XINT (read_kbd
) && detect_input_pending ())
2480 FD_ZERO (&Available
);
2483 nfds
= select (max (max_process_desc
, max_keyboard_desc
) + 1,
2484 &Available
, (SELECT_TYPE
*)0, (SELECT_TYPE
*)0,
2489 /* Make C-g and alarm signals set flags again */
2490 clear_waiting_for_input ();
2492 /* If we woke up due to SIGWINCH, actually change size now. */
2493 do_pending_window_change ();
2495 if (time_limit
&& nfds
== 0 && ! timeout_reduced_for_timers
)
2496 /* We wanted the full specified time, so return now. */
2500 if (xerrno
== EINTR
)
2501 FD_ZERO (&Available
);
2503 /* Ultrix select seems to return ENOMEM when it is
2504 interrupted. Treat it just like EINTR. Bleah. Note
2505 that we want to test for the "ultrix" CPP symbol, not
2506 "__ultrix__"; the latter is only defined under GCC, but
2507 not by DEC's bundled CC. -JimB */
2508 else if (xerrno
== ENOMEM
)
2509 FD_ZERO (&Available
);
2512 /* This happens for no known reason on ALLIANT.
2513 I am guessing that this is the right response. -- RMS. */
2514 else if (xerrno
== EFAULT
)
2515 FD_ZERO (&Available
);
2517 else if (xerrno
== EBADF
)
2520 /* AIX doesn't handle PTY closure the same way BSD does. On AIX,
2521 the child's closure of the pts gives the parent a SIGHUP, and
2522 the ptc file descriptor is automatically closed,
2523 yielding EBADF here or at select() call above.
2524 So, SIGHUP is ignored (see def of PTY_TTY_NAME_SPRINTF
2525 in m/ibmrt-aix.h), and here we just ignore the select error.
2526 Cleanup occurs c/o status_notify after SIGCLD. */
2527 FD_ZERO (&Available
); /* Cannot depend on values returned */
2533 error ("select error: %s", strerror (xerrno
));
2535 #if defined(sun) && !defined(USG5_4)
2536 else if (nfds
> 0 && keyboard_bit_set (&Available
)
2538 /* System sometimes fails to deliver SIGIO.
2540 David J. Mackenzie says that Emacs doesn't compile under
2541 Solaris if this code is enabled, thus the USG5_4 in the CPP
2542 conditional. "I haven't noticed any ill effects so far.
2543 If you find a Solaris expert somewhere, they might know
2545 kill (getpid (), SIGIO
);
2548 #if 0 /* When polling is used, interrupt_input is 0,
2549 so get_input_pending should read the input.
2550 So this should not be needed. */
2551 /* If we are using polling for input,
2552 and we see input available, make it get read now.
2553 Otherwise it might not actually get read for a second.
2554 And on hpux, since we turn off polling in wait_reading_process_input,
2555 it might never get read at all if we don't spend much time
2556 outside of wait_reading_process_input. */
2557 if (XINT (read_kbd
) && interrupt_input
2558 && keyboard_bit_set (&Available
)
2559 && input_polling_used ())
2560 kill (getpid (), SIGALRM
);
2563 /* Check for keyboard input */
2564 /* If there is any, return immediately
2565 to give it higher priority than subprocesses */
2567 if (XINT (read_kbd
) != 0
2568 && detect_input_pending_run_timers (do_display
))
2570 swallow_events (do_display
);
2571 if (detect_input_pending_run_timers (do_display
))
2575 /* If there is unread keyboard input, also return. */
2576 if (XINT (read_kbd
) != 0
2577 && requeued_events_pending_p ())
2580 /* If we are not checking for keyboard input now,
2581 do process events (but don't run any timers).
2582 This is so that X events will be processed.
2583 Otherwise they may have to wait until polling takes place.
2584 That would causes delays in pasting selections, for example.
2586 (We used to do this only if wait_for_cell.) */
2587 if (XINT (read_kbd
) == 0 && detect_input_pending ())
2589 swallow_events (do_display
);
2590 #if 0 /* Exiting when read_kbd doesn't request that seems wrong, though. */
2591 if (detect_input_pending ())
2596 /* Exit now if the cell we're waiting for became non-nil. */
2597 if (wait_for_cell
&& ! NILP (*wait_for_cell
))
2601 /* If we think we have keyboard input waiting, but didn't get SIGIO,
2602 go read it. This can happen with X on BSD after logging out.
2603 In that case, there really is no input and no SIGIO,
2604 but select says there is input. */
2606 if (XINT (read_kbd
) && interrupt_input
2607 && keyboard_bit_set (&Available
))
2608 kill (getpid (), SIGIO
);
2612 got_some_input
|= nfds
> 0;
2614 /* If checking input just got us a size-change event from X,
2615 obey it now if we should. */
2616 if (XINT (read_kbd
) || wait_for_cell
)
2617 do_pending_window_change ();
2619 /* Check for data from a process. */
2620 /* Really FIRST_PROC_DESC should be 0 on Unix,
2621 but this is safer in the short run. */
2622 for (channel
= 0; channel
<= max_process_desc
; channel
++)
2624 if (FD_ISSET (channel
, &Available
)
2625 && FD_ISSET (channel
, &non_keyboard_wait_mask
))
2629 /* If waiting for this channel, arrange to return as
2630 soon as no more input to be processed. No more
2632 if (wait_channel
== channel
)
2638 proc
= chan_process
[channel
];
2642 /* Read data from the process, starting with our
2643 buffered-ahead character if we have one. */
2645 nread
= read_process_output (proc
, channel
);
2648 /* Since read_process_output can run a filter,
2649 which can call accept-process-output,
2650 don't try to read from any other processes
2651 before doing the select again. */
2652 FD_ZERO (&Available
);
2655 redisplay_preserve_echo_area ();
2658 else if (nread
== -1 && errno
== EWOULDBLOCK
)
2661 /* ISC 4.1 defines both EWOULDBLOCK and O_NONBLOCK,
2662 and Emacs uses O_NONBLOCK, so what we get is EAGAIN. */
2664 else if (nread
== -1 && errno
== EAGAIN
)
2668 else if (nread
== -1 && errno
== EAGAIN
)
2670 /* Note that we cannot distinguish between no input
2671 available now and a closed pipe.
2672 With luck, a closed pipe will be accompanied by
2673 subprocess termination and SIGCHLD. */
2674 else if (nread
== 0 && !NETCONN_P (proc
))
2676 #endif /* O_NDELAY */
2677 #endif /* O_NONBLOCK */
2679 /* On some OSs with ptys, when the process on one end of
2680 a pty exits, the other end gets an error reading with
2681 errno = EIO instead of getting an EOF (0 bytes read).
2682 Therefore, if we get an error reading and errno =
2683 EIO, just continue, because the child process has
2684 exited and should clean itself up soon (e.g. when we
2687 However, it has been known to happen that the SIGCHLD
2688 got lost. So raise the signl again just in case.
2690 else if (nread
== -1 && errno
== EIO
)
2691 kill (getpid (), SIGCHLD
);
2692 #endif /* HAVE_PTYS */
2693 /* If we can detect process termination, don't consider the process
2694 gone just because its pipe is closed. */
2696 else if (nread
== 0 && !NETCONN_P (proc
))
2701 /* Preserve status of processes already terminated. */
2702 XSETINT (XPROCESS (proc
)->tick
, ++process_tick
);
2703 deactivate_process (proc
);
2704 if (!NILP (XPROCESS (proc
)->raw_status_low
))
2705 update_status (XPROCESS (proc
));
2706 if (EQ (XPROCESS (proc
)->status
, Qrun
))
2707 XPROCESS (proc
)->status
2708 = Fcons (Qexit
, Fcons (make_number (256), Qnil
));
2711 } /* end for each file descriptor */
2712 } /* end while exit conditions not met */
2714 waiting_for_user_input_p
= 0;
2716 /* If calling from keyboard input, do not quit
2717 since we want to return C-g as an input character.
2718 Otherwise, do pending quit if requested. */
2719 if (XINT (read_kbd
) >= 0)
2721 /* Prevent input_pending from remaining set if we quit. */
2722 clear_input_pending ();
2726 /* AlainF 5-Jul-1996
2727 HP-UX 10.10 seems to have problems with signals coming in
2728 Causes "poll: interrupted system call" messages when Emacs is run
2730 Turn periodic alarms back on */
2734 #ifdef HAVE_X_WINDOWS
2735 if (display_busy_cursor_p
)
2736 if (!inhibit_busy_cursor
)
2737 Fx_show_busy_cursor ();
2740 return got_some_input
;
2743 /* Given a list (FUNCTION ARGS...), apply FUNCTION to the ARGS. */
2746 read_process_output_call (fun_and_args
)
2747 Lisp_Object fun_and_args
;
2749 return apply1 (XCONS (fun_and_args
)->car
, XCONS (fun_and_args
)->cdr
);
2753 read_process_output_error_handler (error
)
2756 cmd_error_internal (error
, "error in process filter: ");
2758 update_echo_area ();
2759 Fsleep_for (make_number (2), Qnil
);
2762 /* Read pending output from the process channel,
2763 starting with our buffered-ahead character if we have one.
2764 Yield number of decoded characters read.
2766 This function reads at most 1024 characters.
2767 If you want to read all available subprocess output,
2768 you must call it repeatedly until it returns zero.
2770 The characters read are decoded according to PROC's coding-system
2774 read_process_output (proc
, channel
)
2776 register int channel
;
2778 register int nchars
, nbytes
;
2781 int chars_allocated
= 0; /* If 1, `chars' should be freed later. */
2785 register Lisp_Object outstream
;
2786 register struct buffer
*old
= current_buffer
;
2787 register struct Lisp_Process
*p
= XPROCESS (proc
);
2788 register int opoint
;
2789 struct coding_system
*coding
= proc_decode_coding_system
[channel
];
2790 int chars_in_decoding_buf
= 0; /* If 1, `chars' points
2791 XSTRING (p->decoding_buf)->data. */
2792 int carryover
= XINT (p
->decoding_carryover
);
2795 VMS_PROC_STUFF
*vs
, *get_vms_process_pointer();
2797 vs
= get_vms_process_pointer (p
->pid
);
2801 return(0); /* Really weird if it does this */
2802 if (!(vs
->iosb
[0] & 1))
2803 return -1; /* I/O error */
2806 error ("Could not get VMS process pointer");
2807 chars
= vs
->inputBuffer
;
2808 nbytes
= clean_vms_buffer (chars
, vs
->iosb
[1]);
2811 start_vms_process_read (vs
); /* Crank up the next read on the process */
2812 return 1; /* Nothing worth printing, say we got 1 */
2816 /* The data carried over in the previous decoding (which are at
2817 the tail of decoding buffer) should be prepended to the new
2818 data read to decode all together. */
2819 char *buf
= (char *) xmalloc (nbytes
+ carryover
);
2821 bcopy (XSTRING (p
->decoding_buf
)->data
2822 + STRING_BYTES (XSTRING (p
->decoding_buf
)) - carryover
,
2824 bcopy (chars
, buf
+ carryover
, nbytes
);
2826 chars_allocated
= 1;
2831 /* See the comment above. */
2832 bcopy (XSTRING (p
->decoding_buf
)->data
2833 + STRING_BYTES (XSTRING (p
->decoding_buf
)) - carryover
,
2836 if (proc_buffered_char
[channel
] < 0)
2837 nbytes
= read (channel
, buf
+ carryover
, (sizeof buf
) - carryover
);
2840 buf
[carryover
] = proc_buffered_char
[channel
];
2841 proc_buffered_char
[channel
] = -1;
2842 nbytes
= read (channel
, buf
+ carryover
+ 1,
2843 (sizeof buf
) - carryover
- 1);
2847 nbytes
= nbytes
+ 1;
2850 #endif /* not VMS */
2852 XSETINT (p
->decoding_carryover
, 0);
2854 /* At this point, NBYTES holds number of characters just received
2855 (including the one in proc_buffered_char[channel]). */
2858 if (nbytes
< 0 || coding
->mode
& CODING_MODE_LAST_BLOCK
)
2860 coding
->mode
|= CODING_MODE_LAST_BLOCK
;
2863 /* Now set NBYTES how many bytes we must decode. */
2864 nbytes
+= carryover
;
2867 if (CODING_MAY_REQUIRE_DECODING (coding
))
2869 int require
= decoding_buffer_size (coding
, nbytes
);
2872 if (STRING_BYTES (XSTRING (p
->decoding_buf
)) < require
)
2873 p
->decoding_buf
= make_uninit_string (require
);
2874 result
= decode_coding (coding
, chars
, XSTRING (p
->decoding_buf
)->data
,
2875 nbytes
, STRING_BYTES (XSTRING (p
->decoding_buf
)));
2876 carryover
= nbytes
- coding
->consumed
;
2879 /* Copy the carryover bytes to the end of p->decoding_buf, to
2880 be processed on the next read. Since decoding_buffer_size
2881 asks for an extra amount of space beyond the maximum
2882 expected for the output, there should always be sufficient
2883 space for the carryover (which is by definition a sequence
2884 of bytes that was not long enough to be decoded, and thus
2885 has a bounded length). */
2886 if (STRING_BYTES (XSTRING (p
->decoding_buf
))
2887 < coding
->produced
+ carryover
)
2889 bcopy (chars
+ coding
->consumed
,
2890 XSTRING (p
->decoding_buf
)->data
2891 + STRING_BYTES (XSTRING (p
->decoding_buf
)) - carryover
,
2893 XSETINT (p
->decoding_carryover
, carryover
);
2896 /* A new coding system might be found by `decode_coding'. */
2897 if (!EQ (p
->decode_coding_system
, coding
->symbol
))
2899 p
->decode_coding_system
= coding
->symbol
;
2901 /* Don't call setup_coding_system for
2902 proc_decode_coding_system[channel] here. It is done in
2903 detect_coding called via decode_coding above. */
2905 /* If a coding system for encoding is not yet decided, we set
2906 it as the same as coding-system for decoding.
2908 But, before doing that we must check if
2909 proc_encode_coding_system[p->outfd] surely points to a
2910 valid memory because p->outfd will be changed once EOF is
2911 sent to the process. */
2912 if (NILP (p
->encode_coding_system
)
2913 && proc_encode_coding_system
[XINT (p
->outfd
)])
2915 p
->encode_coding_system
= coding
->symbol
;
2916 setup_coding_system (coding
->symbol
,
2917 proc_encode_coding_system
[XINT (p
->outfd
)]);
2922 /* Now we don't need the contents of `chars'. */
2923 if (chars_allocated
)
2926 if (coding
->produced
== 0)
2928 chars
= (char *) XSTRING (p
->decoding_buf
)->data
;
2929 nbytes
= coding
->produced
;
2930 nchars
= (coding
->fake_multibyte
2931 ? multibyte_chars_in_text (chars
, nbytes
)
2932 : coding
->produced_char
);
2933 chars_in_decoding_buf
= 1;
2938 if (chars_allocated
)
2940 /* Although we don't have to decode the received data, we
2941 must move it to an area which we don't have to free. */
2942 if (! STRINGP (p
->decoding_buf
)
2943 || STRING_BYTES (XSTRING (p
->decoding_buf
)) < nbytes
)
2944 p
->decoding_buf
= make_uninit_string (nbytes
);
2945 bcopy (chars
, XSTRING (p
->decoding_buf
)->data
, nbytes
);
2947 chars
= XSTRING (p
->decoding_buf
)->data
;
2948 chars_in_decoding_buf
= 1;
2951 nchars
= multibyte_chars_in_text (chars
, nbytes
);
2954 Vlast_coding_system_used
= coding
->symbol
;
2956 /* If the caller required, let the process associated buffer
2957 inherit the coding-system used to decode the process output. */
2958 if (! NILP (p
->inherit_coding_system_flag
)
2959 && !NILP (p
->buffer
) && !NILP (XBUFFER (p
->buffer
)->name
))
2961 struct buffer
*prev_buf
= current_buffer
;
2963 Fset_buffer (p
->buffer
);
2964 call1 (intern ("after-insert-file-set-buffer-file-coding-system"),
2965 make_number (nbytes
));
2966 set_buffer_internal (prev_buf
);
2969 /* Read and dispose of the process output. */
2970 outstream
= p
->filter
;
2971 if (!NILP (outstream
))
2973 /* We inhibit quit here instead of just catching it so that
2974 hitting ^G when a filter happens to be running won't screw
2976 int count
= specpdl_ptr
- specpdl
;
2977 Lisp_Object odeactivate
;
2978 Lisp_Object obuffer
, okeymap
;
2980 int outer_running_asynch_code
= running_asynch_code
;
2981 int waiting
= waiting_for_user_input_p
;
2983 /* No need to gcpro these, because all we do with them later
2984 is test them for EQness, and none of them should be a string. */
2985 odeactivate
= Vdeactivate_mark
;
2986 XSETBUFFER (obuffer
, current_buffer
);
2987 okeymap
= current_buffer
->keymap
;
2989 specbind (Qinhibit_quit
, Qt
);
2990 specbind (Qlast_nonmenu_event
, Qt
);
2992 /* In case we get recursively called,
2993 and we already saved the match data nonrecursively,
2994 save the same match data in safely recursive fashion. */
2995 if (outer_running_asynch_code
)
2998 /* Don't clobber the CURRENT match data, either! */
2999 tem
= Fmatch_data (Qnil
, Qnil
);
3000 restore_match_data ();
3001 record_unwind_protect (Fset_match_data
, Fmatch_data (Qnil
, Qnil
));
3002 Fset_match_data (tem
);
3005 /* For speed, if a search happens within this code,
3006 save the match data in a special nonrecursive fashion. */
3007 running_asynch_code
= 1;
3009 /* The multibyteness of a string given to the filter is decided
3010 by which coding system we used for decoding. */
3011 if (coding
->type
== coding_type_no_conversion
3012 || coding
->type
== coding_type_raw_text
)
3013 text
= make_unibyte_string (chars
, nbytes
);
3015 text
= make_multibyte_string (chars
, nchars
, nbytes
);
3017 internal_condition_case_1 (read_process_output_call
,
3019 Fcons (proc
, Fcons (text
, Qnil
))),
3020 !NILP (Vdebug_on_error
) ? Qnil
: Qerror
,
3021 read_process_output_error_handler
);
3023 /* If we saved the match data nonrecursively, restore it now. */
3024 restore_match_data ();
3025 running_asynch_code
= outer_running_asynch_code
;
3027 /* Handling the process output should not deactivate the mark. */
3028 Vdeactivate_mark
= odeactivate
;
3030 /* Restore waiting_for_user_input_p as it was
3031 when we were called, in case the filter clobbered it. */
3032 waiting_for_user_input_p
= waiting
;
3034 #if 0 /* Call record_asynch_buffer_change unconditionally,
3035 because we might have changed minor modes or other things
3036 that affect key bindings. */
3037 if (! EQ (Fcurrent_buffer (), obuffer
)
3038 || ! EQ (current_buffer
->keymap
, okeymap
))
3040 /* But do it only if the caller is actually going to read events.
3041 Otherwise there's no need to make him wake up, and it could
3042 cause trouble (for example it would make Fsit_for return). */
3043 if (waiting_for_user_input_p
== -1)
3044 record_asynch_buffer_change ();
3047 start_vms_process_read (vs
);
3049 unbind_to (count
, Qnil
);
3053 /* If no filter, write into buffer if it isn't dead. */
3054 if (!NILP (p
->buffer
) && !NILP (XBUFFER (p
->buffer
)->name
))
3056 Lisp_Object old_read_only
;
3057 int old_begv
, old_zv
;
3058 int old_begv_byte
, old_zv_byte
;
3059 Lisp_Object odeactivate
;
3060 int before
, before_byte
;
3063 odeactivate
= Vdeactivate_mark
;
3065 Fset_buffer (p
->buffer
);
3067 opoint_byte
= PT_BYTE
;
3068 old_read_only
= current_buffer
->read_only
;
3071 old_begv_byte
= BEGV_BYTE
;
3072 old_zv_byte
= ZV_BYTE
;
3074 current_buffer
->read_only
= Qnil
;
3076 /* Insert new output into buffer
3077 at the current end-of-output marker,
3078 thus preserving logical ordering of input and output. */
3079 if (XMARKER (p
->mark
)->buffer
)
3080 SET_PT_BOTH (clip_to_bounds (BEGV
, marker_position (p
->mark
), ZV
),
3081 clip_to_bounds (BEGV_BYTE
, marker_byte_position (p
->mark
),
3084 SET_PT_BOTH (ZV
, ZV_BYTE
);
3086 before_byte
= PT_BYTE
;
3088 /* If the output marker is outside of the visible region, save
3089 the restriction and widen. */
3090 if (! (BEGV
<= PT
&& PT
<= ZV
))
3093 if (NILP (current_buffer
->enable_multibyte_characters
))
3096 /* Insert before markers in case we are inserting where
3097 the buffer's mark is, and the user's next command is Meta-y. */
3098 if (chars_in_decoding_buf
)
3100 /* Since multibyteness of p->docoding_buf is corrupted, we
3101 can't use insert_from_string_before_markers. */
3104 temp_buf
= (char *) alloca (nbytes
);
3105 bcopy (XSTRING (p
->decoding_buf
)->data
, temp_buf
, nbytes
);
3106 insert_before_markers (temp_buf
, nbytes
);
3110 insert_1_both (chars
, nchars
, nbytes
, 0, 1, 1);
3111 signal_after_change (opoint
, 0, PT
- opoint
);
3113 set_marker_both (p
->mark
, p
->buffer
, PT
, PT_BYTE
);
3115 update_mode_lines
++;
3117 /* Make sure opoint and the old restrictions
3118 float ahead of any new text just as point would. */
3119 if (opoint
>= before
)
3121 opoint
+= PT
- before
;
3122 opoint_byte
+= PT_BYTE
- before_byte
;
3124 if (old_begv
> before
)
3126 old_begv
+= PT
- before
;
3127 old_begv_byte
+= PT_BYTE
- before_byte
;
3129 if (old_zv
>= before
)
3131 old_zv
+= PT
- before
;
3132 old_zv_byte
+= PT_BYTE
- before_byte
;
3135 /* If the restriction isn't what it should be, set it. */
3136 if (old_begv
!= BEGV
|| old_zv
!= ZV
)
3137 Fnarrow_to_region (make_number (old_begv
), make_number (old_zv
));
3139 /* Handling the process output should not deactivate the mark. */
3140 Vdeactivate_mark
= odeactivate
;
3142 current_buffer
->read_only
= old_read_only
;
3143 SET_PT_BOTH (opoint
, opoint_byte
);
3144 set_buffer_internal (old
);
3147 start_vms_process_read (vs
);
3152 DEFUN ("waiting-for-user-input-p", Fwaiting_for_user_input_p
, Swaiting_for_user_input_p
,
3154 "Returns non-nil if emacs is waiting for input from the user.\n\
3155 This is intended for use by asynchronous process output filters and sentinels.")
3158 return (waiting_for_user_input_p
? Qt
: Qnil
);
3161 /* Sending data to subprocess */
3163 jmp_buf send_process_frame
;
3166 send_process_trap ()
3172 longjmp (send_process_frame
, 1);
3175 /* Send some data to process PROC.
3176 BUF is the beginning of the data; LEN is the number of characters.
3177 OBJECT is the Lisp object that the data comes from.
3179 The data is encoded by PROC's coding-system for encoding before it
3180 is sent. But if the data ends at the middle of multi-byte
3181 representation, that incomplete sequence of bytes are sent without
3182 being encoded. Should we store them in a buffer to prepend them to
3183 the data send later? */
3186 send_process (proc
, buf
, len
, object
)
3187 volatile Lisp_Object proc
;
3192 /* Use volatile to protect variables from being clobbered by longjmp. */
3194 volatile unsigned char *procname
= XSTRING (XPROCESS (proc
)->name
)->data
;
3195 struct coding_system
*coding
;
3196 struct gcpro gcpro1
;
3197 int carryover
= XINT (XPROCESS (proc
)->encoding_carryover
);
3202 struct Lisp_Process
*p
= XPROCESS (proc
);
3203 VMS_PROC_STUFF
*vs
, *get_vms_process_pointer();
3206 if (! NILP (XPROCESS (proc
)->raw_status_low
))
3207 update_status (XPROCESS (proc
));
3208 if (! EQ (XPROCESS (proc
)->status
, Qrun
))
3209 error ("Process %s not running", procname
);
3210 if (XINT (XPROCESS (proc
)->outfd
) < 0)
3211 error ("Output file descriptor of %s is closed", procname
);
3213 coding
= proc_encode_coding_system
[XINT (XPROCESS (proc
)->outfd
)];
3214 Vlast_coding_system_used
= coding
->symbol
;
3216 if (CODING_REQUIRE_ENCODING (coding
))
3218 int require
= encoding_buffer_size (coding
, len
);
3220 unsigned char *temp_buf
= NULL
;
3222 /* Remember the offset of data because a string or a buffer may
3223 be relocated. Setting OFFSET to -1 means we don't have to
3224 care about relocation. */
3225 offset
= (BUFFERP (object
)
3226 ? BUF_PTR_BYTE_POS (XBUFFER (object
), buf
)
3228 ? buf
- XSTRING (object
)->data
3233 temp_buf
= (unsigned char *) xmalloc (len
+ carryover
);
3237 if (BUFFERP (object
))
3238 buf
= BUF_BYTE_ADDRESS (XBUFFER (object
), offset
);
3239 else if (STRINGP (object
))
3240 buf
= offset
+ XSTRING (object
)->data
;
3241 /* Now we don't have to care about relocation. */
3244 bcopy ((XSTRING (XPROCESS (proc
)->encoding_buf
)->data
3245 + STRING_BYTES (XSTRING (XPROCESS (proc
)->encoding_buf
))
3249 bcopy (buf
, temp_buf
+ carryover
, len
);
3253 if (STRING_BYTES (XSTRING (XPROCESS (proc
)->encoding_buf
)) < require
)
3255 XPROCESS (proc
)->encoding_buf
= make_uninit_string (require
);
3259 if (BUFFERP (object
))
3260 buf
= BUF_BYTE_ADDRESS (XBUFFER (object
), offset
);
3261 else if (STRINGP (object
))
3262 buf
= offset
+ XSTRING (object
)->data
;
3265 object
= XPROCESS (proc
)->encoding_buf
;
3266 encode_coding (coding
, buf
, XSTRING (object
)->data
,
3267 len
, STRING_BYTES (XSTRING (object
)));
3268 len
= coding
->produced
;
3269 buf
= XSTRING (object
)->data
;
3275 vs
= get_vms_process_pointer (p
->pid
);
3277 error ("Could not find this process: %x", p
->pid
);
3278 else if (write_to_vms_process (vs
, buf
, len
))
3282 if (pty_max_bytes
== 0)
3284 #if defined (HAVE_FPATHCONF) && defined (_PC_MAX_CANON)
3285 pty_max_bytes
= fpathconf (XFASTINT (XPROCESS (proc
)->outfd
),
3287 if (pty_max_bytes
< 0)
3288 pty_max_bytes
= 250;
3290 pty_max_bytes
= 250;
3292 /* Deduct one, to leave space for the eof. */
3296 if (!setjmp (send_process_frame
))
3300 SIGTYPE (*old_sigpipe
)();
3303 /* Decide how much data we can send in one batch.
3304 Long lines need to be split into multiple batches. */
3305 if (!NILP (XPROCESS (proc
)->pty_flag
))
3307 /* Starting this at zero is always correct when not the first iteration
3308 because the previous iteration ended by sending C-d.
3309 It may not be correct for the first iteration
3310 if a partial line was sent in a separate send_process call.
3311 If that proves worth handling, we need to save linepos
3312 in the process object. */
3314 unsigned char *ptr
= buf
;
3315 unsigned char *end
= buf
+ len
;
3317 /* Scan through this text for a line that is too long. */
3318 while (ptr
!= end
&& linepos
< pty_max_bytes
)
3326 /* If we found one, break the line there
3327 and put in a C-d to force the buffer through. */
3331 /* Send this batch, using one or more write calls. */
3334 old_sigpipe
= (SIGTYPE (*) ()) signal (SIGPIPE
, send_process_trap
);
3335 rv
= write (XINT (XPROCESS (proc
)->outfd
), buf
, this);
3336 signal (SIGPIPE
, old_sigpipe
);
3342 || errno
== EWOULDBLOCK
3348 /* Buffer is full. Wait, accepting input;
3349 that may allow the program
3350 to finish doing output and read more. */
3355 /* Running filters might relocate buffers or strings.
3356 Arrange to relocate BUF. */
3357 if (BUFFERP (object
))
3358 offset
= BUF_PTR_BYTE_POS (XBUFFER (object
), buf
);
3359 else if (STRINGP (object
))
3360 offset
= buf
- XSTRING (object
)->data
;
3362 XSETFASTINT (zero
, 0);
3363 #ifdef EMACS_HAS_USECS
3364 wait_reading_process_input (0, 20000, zero
, 0);
3366 wait_reading_process_input (1, 0, zero
, 0);
3369 if (BUFFERP (object
))
3370 buf
= BUF_BYTE_ADDRESS (XBUFFER (object
), offset
);
3371 else if (STRINGP (object
))
3372 buf
= offset
+ XSTRING (object
)->data
;
3377 /* This is a real error. */
3378 report_file_error ("writing to process", Fcons (proc
, Qnil
));
3385 /* If we sent just part of the string, put in an EOF
3386 to force it through, before we send the rest. */
3388 Fprocess_send_eof (proc
);
3393 XPROCESS (proc
)->raw_status_low
= Qnil
;
3394 XPROCESS (proc
)->raw_status_high
= Qnil
;
3395 XPROCESS (proc
)->status
= Fcons (Qexit
, Fcons (make_number (256), Qnil
));
3396 XSETINT (XPROCESS (proc
)->tick
, ++process_tick
);
3397 deactivate_process (proc
);
3399 error ("Error writing to process %s; closed it", procname
);
3401 error ("SIGPIPE raised on process %s; closed it", procname
);
3408 DEFUN ("process-send-region", Fprocess_send_region
, Sprocess_send_region
,
3410 "Send current contents of region as input to PROCESS.\n\
3411 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
3412 nil, indicating the current buffer's process.\n\
3413 Called from program, takes three arguments, PROCESS, START and END.\n\
3414 If the region is more than 500 characters long,\n\
3415 it is sent in several bunches. This may happen even for shorter regions.\n\
3416 Output from processes can arrive in between bunches.")
3417 (process
, start
, end
)
3418 Lisp_Object process
, start
, end
;
3423 proc
= get_process (process
);
3424 validate_region (&start
, &end
);
3426 if (XINT (start
) < GPT
&& XINT (end
) > GPT
)
3427 move_gap (XINT (start
));
3429 start1
= CHAR_TO_BYTE (XINT (start
));
3430 end1
= CHAR_TO_BYTE (XINT (end
));
3431 send_process (proc
, BYTE_POS_ADDR (start1
), end1
- start1
,
3432 Fcurrent_buffer ());
3437 DEFUN ("process-send-string", Fprocess_send_string
, Sprocess_send_string
,
3439 "Send PROCESS the contents of STRING as input.\n\
3440 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
3441 nil, indicating the current buffer's process.\n\
3442 If STRING is more than 500 characters long,\n\
3443 it is sent in several bunches. This may happen even for shorter strings.\n\
3444 Output from processes can arrive in between bunches.")
3446 Lisp_Object process
, string
;
3449 CHECK_STRING (string
, 1);
3450 proc
= get_process (process
);
3451 send_process (proc
, XSTRING (string
)->data
,
3452 STRING_BYTES (XSTRING (string
)), string
);
3456 DEFUN ("process-running-child-p", Fprocess_running_child_p
,
3457 Sprocess_running_child_p
, 0, 1, 0,
3458 "Return t if PROCESS has given the terminal to a child.\n\
3459 If the operating system does not make it possible to find out,\n\
3460 return t unconditionally.")
3462 Lisp_Object process
;
3464 /* Initialize in case ioctl doesn't exist or gives an error,
3465 in a way that will cause returning t. */
3468 struct Lisp_Process
*p
;
3470 proc
= get_process (process
);
3471 p
= XPROCESS (proc
);
3473 if (!EQ (p
->childp
, Qt
))
3474 error ("Process %s is not a subprocess",
3475 XSTRING (p
->name
)->data
);
3476 if (XINT (p
->infd
) < 0)
3477 error ("Process %s is not active",
3478 XSTRING (p
->name
)->data
);
3481 if (!NILP (p
->subtty
))
3482 ioctl (XFASTINT (p
->subtty
), TIOCGPGRP
, &gid
);
3484 ioctl (XINT (p
->infd
), TIOCGPGRP
, &gid
);
3485 #endif /* defined (TIOCGPGRP ) */
3487 if (gid
== XFASTINT (p
->pid
))
3492 /* send a signal number SIGNO to PROCESS.
3493 If CURRENT_GROUP is t, that means send to the process group
3494 that currently owns the terminal being used to communicate with PROCESS.
3495 This is used for various commands in shell mode.
3496 If CURRENT_GROUP is lambda, that means send to the process group
3497 that currently owns the terminal, but only if it is NOT the shell itself.
3499 If NOMSG is zero, insert signal-announcements into process's buffers
3502 If we can, we try to signal PROCESS by sending control characters
3503 down the pty. This allows us to signal inferiors who have changed
3504 their uid, for which killpg would return an EPERM error. */
3507 process_send_signal (process
, signo
, current_group
, nomsg
)
3508 Lisp_Object process
;
3510 Lisp_Object current_group
;
3514 register struct Lisp_Process
*p
;
3518 proc
= get_process (process
);
3519 p
= XPROCESS (proc
);
3521 if (!EQ (p
->childp
, Qt
))
3522 error ("Process %s is not a subprocess",
3523 XSTRING (p
->name
)->data
);
3524 if (XINT (p
->infd
) < 0)
3525 error ("Process %s is not active",
3526 XSTRING (p
->name
)->data
);
3528 if (NILP (p
->pty_flag
))
3529 current_group
= Qnil
;
3531 /* If we are using pgrps, get a pgrp number and make it negative. */
3532 if (!NILP (current_group
))
3534 #ifdef SIGNALS_VIA_CHARACTERS
3535 /* If possible, send signals to the entire pgrp
3536 by sending an input character to it. */
3538 /* TERMIOS is the latest and bestest, and seems most likely to
3539 work. If the system has it, use it. */
3546 tcgetattr (XINT (p
->infd
), &t
);
3547 send_process (proc
, &t
.c_cc
[VINTR
], 1, Qnil
);
3551 tcgetattr (XINT (p
->infd
), &t
);
3552 send_process (proc
, &t
.c_cc
[VQUIT
], 1, Qnil
);
3556 tcgetattr (XINT (p
->infd
), &t
);
3557 #if defined (VSWTCH) && !defined (PREFER_VSUSP)
3558 send_process (proc
, &t
.c_cc
[VSWTCH
], 1, Qnil
);
3560 send_process (proc
, &t
.c_cc
[VSUSP
], 1, Qnil
);
3565 #else /* ! HAVE_TERMIOS */
3567 /* On Berkeley descendants, the following IOCTL's retrieve the
3568 current control characters. */
3569 #if defined (TIOCGLTC) && defined (TIOCGETC)
3577 ioctl (XINT (p
->infd
), TIOCGETC
, &c
);
3578 send_process (proc
, &c
.t_intrc
, 1, Qnil
);
3581 ioctl (XINT (p
->infd
), TIOCGETC
, &c
);
3582 send_process (proc
, &c
.t_quitc
, 1, Qnil
);
3586 ioctl (XINT (p
->infd
), TIOCGLTC
, &lc
);
3587 send_process (proc
, &lc
.t_suspc
, 1, Qnil
);
3589 #endif /* ! defined (SIGTSTP) */
3592 #else /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
3594 /* On SYSV descendants, the TCGETA ioctl retrieves the current control
3601 ioctl (XINT (p
->infd
), TCGETA
, &t
);
3602 send_process (proc
, &t
.c_cc
[VINTR
], 1, Qnil
);
3605 ioctl (XINT (p
->infd
), TCGETA
, &t
);
3606 send_process (proc
, &t
.c_cc
[VQUIT
], 1, Qnil
);
3610 ioctl (XINT (p
->infd
), TCGETA
, &t
);
3611 send_process (proc
, &t
.c_cc
[VSWTCH
], 1, Qnil
);
3613 #endif /* ! defined (SIGTSTP) */
3615 #else /* ! defined (TCGETA) */
3616 Your configuration files are messed up
.
3617 /* If your system configuration files define SIGNALS_VIA_CHARACTERS,
3618 you'd better be using one of the alternatives above! */
3619 #endif /* ! defined (TCGETA) */
3620 #endif /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
3621 #endif /* ! defined HAVE_TERMIOS */
3622 #endif /* ! defined (SIGNALS_VIA_CHARACTERS) */
3625 /* Get the pgrp using the tty itself, if we have that.
3626 Otherwise, use the pty to get the pgrp.
3627 On pfa systems, saka@pfu.fujitsu.co.JP writes:
3628 "TIOCGPGRP symbol defined in sys/ioctl.h at E50.
3629 But, TIOCGPGRP does not work on E50 ;-P works fine on E60"
3630 His patch indicates that if TIOCGPGRP returns an error, then
3631 we should just assume that p->pid is also the process group id. */
3635 if (!NILP (p
->subtty
))
3636 err
= ioctl (XFASTINT (p
->subtty
), TIOCGPGRP
, &gid
);
3638 err
= ioctl (XINT (p
->infd
), TIOCGPGRP
, &gid
);
3642 gid
= - XFASTINT (p
->pid
);
3643 #endif /* ! defined (pfa) */
3649 #else /* ! defined (TIOCGPGRP ) */
3650 /* Can't select pgrps on this system, so we know that
3651 the child itself heads the pgrp. */
3652 gid
= - XFASTINT (p
->pid
);
3653 #endif /* ! defined (TIOCGPGRP ) */
3655 /* If current_group is lambda, and the shell owns the terminal,
3656 don't send any signal. */
3657 if (EQ (current_group
, Qlambda
) && gid
== - XFASTINT (p
->pid
))
3661 gid
= - XFASTINT (p
->pid
);
3667 p
->raw_status_low
= Qnil
;
3668 p
->raw_status_high
= Qnil
;
3670 XSETINT (p
->tick
, ++process_tick
);
3674 #endif /* ! defined (SIGCONT) */
3677 send_process (proc
, "\003", 1, Qnil
); /* ^C */
3682 send_process (proc
, "\031", 1, Qnil
); /* ^Y */
3687 sys$
forcex (&(XFASTINT (p
->pid
)), 0, 1);
3690 flush_pending_output (XINT (p
->infd
));
3694 /* If we don't have process groups, send the signal to the immediate
3695 subprocess. That isn't really right, but it's better than any
3696 obvious alternative. */
3699 kill (XFASTINT (p
->pid
), signo
);
3703 /* gid may be a pid, or minus a pgrp's number */
3705 if (!NILP (current_group
))
3706 ioctl (XINT (p
->infd
), TIOCSIGSEND
, signo
);
3709 gid
= - XFASTINT (p
->pid
);
3712 #else /* ! defined (TIOCSIGSEND) */
3713 EMACS_KILLPG (-gid
, signo
);
3714 #endif /* ! defined (TIOCSIGSEND) */
3717 DEFUN ("interrupt-process", Finterrupt_process
, Sinterrupt_process
, 0, 2, 0,
3718 "Interrupt process PROCESS.\n\
3719 PROCESS may be a process, a buffer, or the name of a process or buffer.\n\
3720 nil or no arg means current buffer's process.\n\
3721 Second arg CURRENT-GROUP non-nil means send signal to\n\
3722 the current process-group of the process's controlling terminal\n\
3723 rather than to the process's own process group.\n\
3724 If the process is a shell, this means interrupt current subjob\n\
3725 rather than the shell.\n\
3727 If CURRENT-GROUP is `lambda', and if the shell owns the terminal,\n\
3728 don't send the signal.")
3729 (process
, current_group
)
3730 Lisp_Object process
, current_group
;
3732 process_send_signal (process
, SIGINT
, current_group
, 0);
3736 DEFUN ("kill-process", Fkill_process
, Skill_process
, 0, 2, 0,
3737 "Kill process PROCESS. May be process or name of one.\n\
3738 See function `interrupt-process' for more details on usage.")
3739 (process
, current_group
)
3740 Lisp_Object process
, current_group
;
3742 process_send_signal (process
, SIGKILL
, current_group
, 0);
3746 DEFUN ("quit-process", Fquit_process
, Squit_process
, 0, 2, 0,
3747 "Send QUIT signal to process PROCESS. May be process or name of one.\n\
3748 See function `interrupt-process' for more details on usage.")
3749 (process
, current_group
)
3750 Lisp_Object process
, current_group
;
3752 process_send_signal (process
, SIGQUIT
, current_group
, 0);
3756 DEFUN ("stop-process", Fstop_process
, Sstop_process
, 0, 2, 0,
3757 "Stop process PROCESS. May be process or name of one.\n\
3758 See function `interrupt-process' for more details on usage.")
3759 (process
, current_group
)
3760 Lisp_Object process
, current_group
;
3763 error ("no SIGTSTP support");
3765 process_send_signal (process
, SIGTSTP
, current_group
, 0);
3770 DEFUN ("continue-process", Fcontinue_process
, Scontinue_process
, 0, 2, 0,
3771 "Continue process PROCESS. May be process or name of one.\n\
3772 See function `interrupt-process' for more details on usage.")
3773 (process
, current_group
)
3774 Lisp_Object process
, current_group
;
3777 process_send_signal (process
, SIGCONT
, current_group
, 0);
3779 error ("no SIGCONT support");
3784 DEFUN ("signal-process", Fsignal_process
, Ssignal_process
,
3785 2, 2, "nProcess number: \nnSignal code: ",
3786 "Send the process with process id PID the signal with code SIGCODE.\n\
3787 PID must be an integer. The process need not be a child of this Emacs.\n\
3788 SIGCODE may be an integer, or a symbol whose name is a signal name.")
3790 Lisp_Object pid
, sigcode
;
3792 CHECK_NUMBER (pid
, 0);
3794 #define handle_signal(NAME, VALUE) \
3795 else if (!strcmp (name, NAME)) \
3796 XSETINT (sigcode, VALUE)
3798 if (INTEGERP (sigcode
))
3802 unsigned char *name
;
3804 CHECK_SYMBOL (sigcode
, 1);
3805 name
= XSYMBOL (sigcode
)->name
->data
;
3810 handle_signal ("SIGHUP", SIGHUP
);
3813 handle_signal ("SIGINT", SIGINT
);
3816 handle_signal ("SIGQUIT", SIGQUIT
);
3819 handle_signal ("SIGILL", SIGILL
);
3822 handle_signal ("SIGABRT", SIGABRT
);
3825 handle_signal ("SIGEMT", SIGEMT
);
3828 handle_signal ("SIGKILL", SIGKILL
);
3831 handle_signal ("SIGFPE", SIGFPE
);
3834 handle_signal ("SIGBUS", SIGBUS
);
3837 handle_signal ("SIGSEGV", SIGSEGV
);
3840 handle_signal ("SIGSYS", SIGSYS
);
3843 handle_signal ("SIGPIPE", SIGPIPE
);
3846 handle_signal ("SIGALRM", SIGALRM
);
3849 handle_signal ("SIGTERM", SIGTERM
);
3852 handle_signal ("SIGURG", SIGURG
);
3855 handle_signal ("SIGSTOP", SIGSTOP
);
3858 handle_signal ("SIGTSTP", SIGTSTP
);
3861 handle_signal ("SIGCONT", SIGCONT
);
3864 handle_signal ("SIGCHLD", SIGCHLD
);
3867 handle_signal ("SIGTTIN", SIGTTIN
);
3870 handle_signal ("SIGTTOU", SIGTTOU
);
3873 handle_signal ("SIGIO", SIGIO
);
3876 handle_signal ("SIGXCPU", SIGXCPU
);
3879 handle_signal ("SIGXFSZ", SIGXFSZ
);
3882 handle_signal ("SIGVTALRM", SIGVTALRM
);
3885 handle_signal ("SIGPROF", SIGPROF
);
3888 handle_signal ("SIGWINCH", SIGWINCH
);
3891 handle_signal ("SIGINFO", SIGINFO
);
3894 handle_signal ("SIGUSR1", SIGUSR1
);
3897 handle_signal ("SIGUSR2", SIGUSR2
);
3900 error ("Undefined signal name %s", name
);
3903 #undef handle_signal
3905 return make_number (kill (XINT (pid
), XINT (sigcode
)));
3908 DEFUN ("process-send-eof", Fprocess_send_eof
, Sprocess_send_eof
, 0, 1, 0,
3909 "Make PROCESS see end-of-file in its input.\n\
3910 EOF comes after any text already sent to it.\n\
3911 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
3912 nil, indicating the current buffer's process.\n\
3913 If PROCESS is a network connection, or is a process communicating\n\
3914 through a pipe (as opposed to a pty), then you cannot send any more\n\
3915 text to PROCESS after you call this function.")
3917 Lisp_Object process
;
3920 struct coding_system
*coding
;
3922 proc
= get_process (process
);
3923 coding
= proc_encode_coding_system
[XINT (XPROCESS (proc
)->outfd
)];
3925 /* Make sure the process is really alive. */
3926 if (! NILP (XPROCESS (proc
)->raw_status_low
))
3927 update_status (XPROCESS (proc
));
3928 if (! EQ (XPROCESS (proc
)->status
, Qrun
))
3929 error ("Process %s not running", XSTRING (XPROCESS (proc
)->name
)->data
);
3931 if (CODING_REQUIRE_FLUSHING (coding
))
3933 coding
->mode
|= CODING_MODE_LAST_BLOCK
;
3934 send_process (proc
, "", 0, Qnil
);
3938 send_process (proc
, "\032", 1, Qnil
); /* ^z */
3940 if (!NILP (XPROCESS (proc
)->pty_flag
))
3941 send_process (proc
, "\004", 1, Qnil
);
3944 int old_outfd
, new_outfd
;
3946 #ifdef HAVE_SHUTDOWN
3947 /* If this is a network connection, or socketpair is used
3948 for communication with the subprocess, call shutdown to cause EOF.
3949 (In some old system, shutdown to socketpair doesn't work.
3950 Then we just can't win.) */
3951 if (NILP (XPROCESS (proc
)->pid
)
3952 || XINT (XPROCESS (proc
)->outfd
) == XINT (XPROCESS (proc
)->infd
))
3953 shutdown (XINT (XPROCESS (proc
)->outfd
), 1);
3954 /* In case of socketpair, outfd == infd, so don't close it. */
3955 if (XINT (XPROCESS (proc
)->outfd
) != XINT (XPROCESS (proc
)->infd
))
3956 close (XINT (XPROCESS (proc
)->outfd
));
3957 #else /* not HAVE_SHUTDOWN */
3958 close (XINT (XPROCESS (proc
)->outfd
));
3959 #endif /* not HAVE_SHUTDOWN */
3960 new_outfd
= open (NULL_DEVICE
, O_WRONLY
);
3961 old_outfd
= XINT (XPROCESS (proc
)->outfd
);
3963 if (!proc_encode_coding_system
[new_outfd
])
3964 proc_encode_coding_system
[new_outfd
]
3965 = (struct coding_system
*) xmalloc (sizeof (struct coding_system
));
3966 bcopy (proc_encode_coding_system
[old_outfd
],
3967 proc_encode_coding_system
[new_outfd
],
3968 sizeof (struct coding_system
));
3969 bzero (proc_encode_coding_system
[old_outfd
],
3970 sizeof (struct coding_system
));
3972 XSETINT (XPROCESS (proc
)->outfd
, new_outfd
);
3978 /* Kill all processes associated with `buffer'.
3979 If `buffer' is nil, kill all processes */
3982 kill_buffer_processes (buffer
)
3985 Lisp_Object tail
, proc
;
3987 for (tail
= Vprocess_alist
; GC_CONSP (tail
); tail
= XCONS (tail
)->cdr
)
3989 proc
= XCONS (XCONS (tail
)->car
)->cdr
;
3990 if (GC_PROCESSP (proc
)
3991 && (NILP (buffer
) || EQ (XPROCESS (proc
)->buffer
, buffer
)))
3993 if (NETCONN_P (proc
))
3994 Fdelete_process (proc
);
3995 else if (XINT (XPROCESS (proc
)->infd
) >= 0)
3996 process_send_signal (proc
, SIGHUP
, Qnil
, 1);
4001 /* On receipt of a signal that a child status has changed,
4002 loop asking about children with changed statuses until
4003 the system says there are no more.
4004 All we do is change the status;
4005 we do not run sentinels or print notifications.
4006 That is saved for the next time keyboard input is done,
4007 in order to avoid timing errors. */
4009 /** WARNING: this can be called during garbage collection.
4010 Therefore, it must not be fooled by the presence of mark bits in
4013 /** USG WARNING: Although it is not obvious from the documentation
4014 in signal(2), on a USG system the SIGCLD handler MUST NOT call
4015 signal() before executing at least one wait(), otherwise the handler
4016 will be called again, resulting in an infinite loop. The relevant
4017 portion of the documentation reads "SIGCLD signals will be queued
4018 and the signal-catching function will be continually reentered until
4019 the queue is empty". Invoking signal() causes the kernel to reexamine
4020 the SIGCLD queue. Fred Fish, UniSoft Systems Inc. */
4023 sigchld_handler (signo
)
4026 int old_errno
= errno
;
4028 register struct Lisp_Process
*p
;
4029 extern EMACS_TIME
*input_available_clear_time
;
4033 sigheld
|= sigbit (SIGCHLD
);
4045 #endif /* no WUNTRACED */
4046 /* Keep trying to get a status until we get a definitive result. */
4050 pid
= wait3 (&w
, WNOHANG
| WUNTRACED
, 0);
4052 while (pid
<= 0 && errno
== EINTR
);
4056 /* A real failure. We have done all our job, so return. */
4058 /* USG systems forget handlers when they are used;
4059 must reestablish each time */
4060 #if defined (USG) && !defined (POSIX_SIGNALS)
4061 signal (signo
, sigchld_handler
); /* WARNING - must come after wait3() */
4064 sigheld
&= ~sigbit (SIGCHLD
);
4072 #endif /* no WNOHANG */
4074 /* Find the process that signaled us, and record its status. */
4077 for (tail
= Vprocess_alist
; CONSP (tail
); tail
= XCONS (tail
)->cdr
)
4079 proc
= XCONS (XCONS (tail
)->car
)->cdr
;
4080 p
= XPROCESS (proc
);
4081 if (EQ (p
->childp
, Qt
) && XFASTINT (p
->pid
) == pid
)
4086 /* Look for an asynchronous process whose pid hasn't been filled
4089 for (tail
= Vprocess_alist
; CONSP (tail
); tail
= XCONS (tail
)->cdr
)
4091 proc
= XCONS (XCONS (tail
)->car
)->cdr
;
4092 p
= XPROCESS (proc
);
4093 if (INTEGERP (p
->pid
) && XINT (p
->pid
) == -1)
4098 /* Change the status of the process that was found. */
4101 union { int i
; WAITTYPE wt
; } u
;
4102 int clear_desc_flag
= 0;
4104 XSETINT (p
->tick
, ++process_tick
);
4106 XSETINT (p
->raw_status_low
, u
.i
& 0xffff);
4107 XSETINT (p
->raw_status_high
, u
.i
>> 16);
4109 /* If process has terminated, stop waiting for its output. */
4110 if ((WIFSIGNALED (w
) || WIFEXITED (w
))
4111 && XINT (p
->infd
) >= 0)
4112 clear_desc_flag
= 1;
4114 /* We use clear_desc_flag to avoid a compiler bug in Microsoft C. */
4115 if (clear_desc_flag
)
4117 FD_CLR (XINT (p
->infd
), &input_wait_mask
);
4118 FD_CLR (XINT (p
->infd
), &non_keyboard_wait_mask
);
4121 /* Tell wait_reading_process_input that it needs to wake up and
4123 if (input_available_clear_time
)
4124 EMACS_SET_SECS_USECS (*input_available_clear_time
, 0, 0);
4127 /* There was no asynchronous process found for that id. Check
4128 if we have a synchronous process. */
4131 synch_process_alive
= 0;
4133 /* Report the status of the synchronous process. */
4135 synch_process_retcode
= WRETCODE (w
);
4136 else if (WIFSIGNALED (w
))
4138 int code
= WTERMSIG (w
);
4144 /* Suppress warning if the table has const char *. */
4145 signame
= (char *) sys_siglist
[code
];
4147 signame
= sys_errlist
[code
];
4151 signame
= "unknown";
4153 synch_process_death
= signame
;
4156 /* Tell wait_reading_process_input that it needs to wake up and
4158 if (input_available_clear_time
)
4159 EMACS_SET_SECS_USECS (*input_available_clear_time
, 0, 0);
4162 /* On some systems, we must return right away.
4163 If any more processes want to signal us, we will
4165 Otherwise (on systems that have WNOHANG), loop around
4166 to use up all the processes that have something to tell us. */
4167 #if defined (USG) && ! (defined (HPUX) && defined (WNOHANG)) || defined (WINDOWSNT)
4168 #if defined (USG) && ! defined (POSIX_SIGNALS)
4169 signal (signo
, sigchld_handler
);
4173 #endif /* USG, but not HPUX with WNOHANG */
4179 exec_sentinel_unwind (data
)
4182 XPROCESS (XCONS (data
)->car
)->sentinel
= XCONS (data
)->cdr
;
4187 exec_sentinel_error_handler (error
)
4190 cmd_error_internal (error
, "error in process sentinel: ");
4192 update_echo_area ();
4193 Fsleep_for (make_number (2), Qnil
);
4197 exec_sentinel (proc
, reason
)
4198 Lisp_Object proc
, reason
;
4200 Lisp_Object sentinel
, obuffer
, odeactivate
, okeymap
;
4201 register struct Lisp_Process
*p
= XPROCESS (proc
);
4202 int count
= specpdl_ptr
- specpdl
;
4203 int outer_running_asynch_code
= running_asynch_code
;
4204 int waiting
= waiting_for_user_input_p
;
4206 /* No need to gcpro these, because all we do with them later
4207 is test them for EQness, and none of them should be a string. */
4208 odeactivate
= Vdeactivate_mark
;
4209 XSETBUFFER (obuffer
, current_buffer
);
4210 okeymap
= current_buffer
->keymap
;
4212 sentinel
= p
->sentinel
;
4213 if (NILP (sentinel
))
4216 /* Zilch the sentinel while it's running, to avoid recursive invocations;
4217 assure that it gets restored no matter how the sentinel exits. */
4219 record_unwind_protect (exec_sentinel_unwind
, Fcons (proc
, sentinel
));
4220 /* Inhibit quit so that random quits don't screw up a running filter. */
4221 specbind (Qinhibit_quit
, Qt
);
4222 specbind (Qlast_nonmenu_event
, Qt
);
4224 /* In case we get recursively called,
4225 and we already saved the match data nonrecursively,
4226 save the same match data in safely recursive fashion. */
4227 if (outer_running_asynch_code
)
4230 tem
= Fmatch_data (Qnil
, Qnil
);
4231 restore_match_data ();
4232 record_unwind_protect (Fset_match_data
, Fmatch_data (Qnil
, Qnil
));
4233 Fset_match_data (tem
);
4236 /* For speed, if a search happens within this code,
4237 save the match data in a special nonrecursive fashion. */
4238 running_asynch_code
= 1;
4240 internal_condition_case_1 (read_process_output_call
,
4242 Fcons (proc
, Fcons (reason
, Qnil
))),
4243 !NILP (Vdebug_on_error
) ? Qnil
: Qerror
,
4244 exec_sentinel_error_handler
);
4246 /* If we saved the match data nonrecursively, restore it now. */
4247 restore_match_data ();
4248 running_asynch_code
= outer_running_asynch_code
;
4250 Vdeactivate_mark
= odeactivate
;
4252 /* Restore waiting_for_user_input_p as it was
4253 when we were called, in case the filter clobbered it. */
4254 waiting_for_user_input_p
= waiting
;
4257 if (! EQ (Fcurrent_buffer (), obuffer
)
4258 || ! EQ (current_buffer
->keymap
, okeymap
))
4260 /* But do it only if the caller is actually going to read events.
4261 Otherwise there's no need to make him wake up, and it could
4262 cause trouble (for example it would make Fsit_for return). */
4263 if (waiting_for_user_input_p
== -1)
4264 record_asynch_buffer_change ();
4266 unbind_to (count
, Qnil
);
4269 /* Report all recent events of a change in process status
4270 (either run the sentinel or output a message).
4271 This is done while Emacs is waiting for keyboard input. */
4276 register Lisp_Object proc
, buffer
;
4277 Lisp_Object tail
, msg
;
4278 struct gcpro gcpro1
, gcpro2
;
4282 /* We need to gcpro tail; if read_process_output calls a filter
4283 which deletes a process and removes the cons to which tail points
4284 from Vprocess_alist, and then causes a GC, tail is an unprotected
4288 /* Set this now, so that if new processes are created by sentinels
4289 that we run, we get called again to handle their status changes. */
4290 update_tick
= process_tick
;
4292 for (tail
= Vprocess_alist
; !NILP (tail
); tail
= Fcdr (tail
))
4295 register struct Lisp_Process
*p
;
4297 proc
= Fcdr (Fcar (tail
));
4298 p
= XPROCESS (proc
);
4300 if (XINT (p
->tick
) != XINT (p
->update_tick
))
4302 XSETINT (p
->update_tick
, XINT (p
->tick
));
4304 /* If process is still active, read any output that remains. */
4305 while (! EQ (p
->filter
, Qt
)
4306 && XINT (p
->infd
) >= 0
4307 && read_process_output (proc
, XINT (p
->infd
)) > 0);
4311 /* Get the text to use for the message. */
4312 if (!NILP (p
->raw_status_low
))
4314 msg
= status_message (p
->status
);
4316 /* If process is terminated, deactivate it or delete it. */
4318 if (CONSP (p
->status
))
4319 symbol
= XCONS (p
->status
)->car
;
4321 if (EQ (symbol
, Qsignal
) || EQ (symbol
, Qexit
)
4322 || EQ (symbol
, Qclosed
))
4324 if (delete_exited_processes
)
4325 remove_process (proc
);
4327 deactivate_process (proc
);
4330 /* The actions above may have further incremented p->tick.
4331 So set p->update_tick again
4332 so that an error in the sentinel will not cause
4333 this code to be run again. */
4334 XSETINT (p
->update_tick
, XINT (p
->tick
));
4335 /* Now output the message suitably. */
4336 if (!NILP (p
->sentinel
))
4337 exec_sentinel (proc
, msg
);
4338 /* Don't bother with a message in the buffer
4339 when a process becomes runnable. */
4340 else if (!EQ (symbol
, Qrun
) && !NILP (buffer
))
4342 Lisp_Object ro
, tem
;
4343 struct buffer
*old
= current_buffer
;
4344 int opoint
, opoint_byte
;
4345 int before
, before_byte
;
4347 ro
= XBUFFER (buffer
)->read_only
;
4349 /* Avoid error if buffer is deleted
4350 (probably that's why the process is dead, too) */
4351 if (NILP (XBUFFER (buffer
)->name
))
4353 Fset_buffer (buffer
);
4356 opoint_byte
= PT_BYTE
;
4357 /* Insert new output into buffer
4358 at the current end-of-output marker,
4359 thus preserving logical ordering of input and output. */
4360 if (XMARKER (p
->mark
)->buffer
)
4361 Fgoto_char (p
->mark
);
4363 SET_PT_BOTH (ZV
, ZV_BYTE
);
4366 before_byte
= PT_BYTE
;
4368 tem
= current_buffer
->read_only
;
4369 current_buffer
->read_only
= Qnil
;
4370 insert_string ("\nProcess ");
4371 Finsert (1, &p
->name
);
4372 insert_string (" ");
4374 current_buffer
->read_only
= tem
;
4375 set_marker_both (p
->mark
, p
->buffer
, PT
, PT_BYTE
);
4377 if (opoint
>= before
)
4378 SET_PT_BOTH (opoint
+ (PT
- before
),
4379 opoint_byte
+ (PT_BYTE
- before_byte
));
4381 SET_PT_BOTH (opoint
, opoint_byte
);
4383 set_buffer_internal (old
);
4388 update_mode_lines
++; /* in case buffers use %s in mode-line-format */
4389 redisplay_preserve_echo_area ();
4395 DEFUN ("set-process-coding-system", Fset_process_coding_system
,
4396 Sset_process_coding_system
, 1, 3, 0,
4397 "Set coding systems of PROCESS to DECODING and ENCODING.\n\
4398 DECODING will be used to decode subprocess output and ENCODING to\n\
4399 encode subprocess input.")
4400 (proc
, decoding
, encoding
)
4401 register Lisp_Object proc
, decoding
, encoding
;
4403 register struct Lisp_Process
*p
;
4405 CHECK_PROCESS (proc
, 0);
4406 p
= XPROCESS (proc
);
4407 if (XINT (p
->infd
) < 0)
4408 error ("Input file descriptor of %s closed", XSTRING (p
->name
)->data
);
4409 if (XINT (p
->outfd
) < 0)
4410 error ("Output file descriptor of %s closed", XSTRING (p
->name
)->data
);
4412 p
->decode_coding_system
= Fcheck_coding_system (decoding
);
4413 p
->encode_coding_system
= Fcheck_coding_system (encoding
);
4414 setup_coding_system (decoding
,
4415 proc_decode_coding_system
[XINT (p
->infd
)]);
4416 setup_coding_system (encoding
,
4417 proc_encode_coding_system
[XINT (p
->outfd
)]);
4422 DEFUN ("process-coding-system",
4423 Fprocess_coding_system
, Sprocess_coding_system
, 1, 1, 0,
4424 "Return a cons of coding systems for decoding and encoding of PROCESS.")
4426 register Lisp_Object proc
;
4428 CHECK_PROCESS (proc
, 0);
4429 return Fcons (XPROCESS (proc
)->decode_coding_system
,
4430 XPROCESS (proc
)->encode_coding_system
);
4433 /* The first time this is called, assume keyboard input comes from DESC
4434 instead of from where we used to expect it.
4435 Subsequent calls mean assume input keyboard can come from DESC
4436 in addition to other places. */
4438 static int add_keyboard_wait_descriptor_called_flag
;
4441 add_keyboard_wait_descriptor (desc
)
4444 if (! add_keyboard_wait_descriptor_called_flag
)
4445 FD_CLR (0, &input_wait_mask
);
4446 add_keyboard_wait_descriptor_called_flag
= 1;
4447 FD_SET (desc
, &input_wait_mask
);
4448 FD_SET (desc
, &non_process_wait_mask
);
4449 if (desc
> max_keyboard_desc
)
4450 max_keyboard_desc
= desc
;
4453 /* From now on, do not expect DESC to give keyboard input. */
4456 delete_keyboard_wait_descriptor (desc
)
4460 int lim
= max_keyboard_desc
;
4462 FD_CLR (desc
, &input_wait_mask
);
4463 FD_CLR (desc
, &non_process_wait_mask
);
4465 if (desc
== max_keyboard_desc
)
4466 for (fd
= 0; fd
< lim
; fd
++)
4467 if (FD_ISSET (fd
, &input_wait_mask
)
4468 && !FD_ISSET (fd
, &non_keyboard_wait_mask
))
4469 max_keyboard_desc
= fd
;
4472 /* Return nonzero if *MASK has a bit set
4473 that corresponds to one of the keyboard input descriptors. */
4476 keyboard_bit_set (mask
)
4481 for (fd
= 0; fd
<= max_keyboard_desc
; fd
++)
4482 if (FD_ISSET (fd
, mask
) && FD_ISSET (fd
, &input_wait_mask
)
4483 && !FD_ISSET (fd
, &non_keyboard_wait_mask
))
4496 if (! noninteractive
|| initialized
)
4498 signal (SIGCHLD
, sigchld_handler
);
4501 FD_ZERO (&input_wait_mask
);
4502 FD_ZERO (&non_keyboard_wait_mask
);
4503 FD_ZERO (&non_process_wait_mask
);
4504 max_process_desc
= 0;
4506 FD_SET (0, &input_wait_mask
);
4508 Vprocess_alist
= Qnil
;
4509 for (i
= 0; i
< MAXDESC
; i
++)
4511 chan_process
[i
] = Qnil
;
4512 proc_buffered_char
[i
] = -1;
4514 bzero (proc_decode_coding_system
, sizeof proc_decode_coding_system
);
4515 bzero (proc_encode_coding_system
, sizeof proc_encode_coding_system
);
4517 Vdefault_process_coding_system
4518 = (NILP (buffer_defaults
.enable_multibyte_characters
)
4519 ? Fcons (Qraw_text
, Qnil
)
4520 : Fcons (Qemacs_mule
, Qnil
));
4526 Qprocessp
= intern ("processp");
4527 staticpro (&Qprocessp
);
4528 Qrun
= intern ("run");
4530 Qstop
= intern ("stop");
4532 Qsignal
= intern ("signal");
4533 staticpro (&Qsignal
);
4535 /* Qexit is already staticpro'd by syms_of_eval; don't staticpro it
4538 Qexit = intern ("exit");
4539 staticpro (&Qexit); */
4541 Qopen
= intern ("open");
4543 Qclosed
= intern ("closed");
4544 staticpro (&Qclosed
);
4546 Qlast_nonmenu_event
= intern ("last-nonmenu-event");
4547 staticpro (&Qlast_nonmenu_event
);
4549 staticpro (&Vprocess_alist
);
4551 DEFVAR_BOOL ("delete-exited-processes", &delete_exited_processes
,
4552 "*Non-nil means delete processes immediately when they exit.\n\
4553 nil means don't delete them until `list-processes' is run.");
4555 delete_exited_processes
= 1;
4557 DEFVAR_LISP ("process-connection-type", &Vprocess_connection_type
,
4558 "Control type of device used to communicate with subprocesses.\n\
4559 Values are nil to use a pipe, or t or `pty' to use a pty.\n\
4560 The value has no effect if the system has no ptys or if all ptys are busy:\n\
4561 then a pipe is used in any case.\n\
4562 The value takes effect when `start-process' is called.");
4563 Vprocess_connection_type
= Qt
;
4565 defsubr (&Sprocessp
);
4566 defsubr (&Sget_process
);
4567 defsubr (&Sget_buffer_process
);
4568 defsubr (&Sdelete_process
);
4569 defsubr (&Sprocess_status
);
4570 defsubr (&Sprocess_exit_status
);
4571 defsubr (&Sprocess_id
);
4572 defsubr (&Sprocess_name
);
4573 defsubr (&Sprocess_tty_name
);
4574 defsubr (&Sprocess_command
);
4575 defsubr (&Sset_process_buffer
);
4576 defsubr (&Sprocess_buffer
);
4577 defsubr (&Sprocess_mark
);
4578 defsubr (&Sset_process_filter
);
4579 defsubr (&Sprocess_filter
);
4580 defsubr (&Sset_process_sentinel
);
4581 defsubr (&Sprocess_sentinel
);
4582 defsubr (&Sset_process_window_size
);
4583 defsubr (&Sset_process_inherit_coding_system_flag
);
4584 defsubr (&Sprocess_inherit_coding_system_flag
);
4585 defsubr (&Sprocess_kill_without_query
);
4586 defsubr (&Sprocess_contact
);
4587 defsubr (&Slist_processes
);
4588 defsubr (&Sprocess_list
);
4589 defsubr (&Sstart_process
);
4591 defsubr (&Sopen_network_stream
);
4592 #endif /* HAVE_SOCKETS */
4593 defsubr (&Saccept_process_output
);
4594 defsubr (&Sprocess_send_region
);
4595 defsubr (&Sprocess_send_string
);
4596 defsubr (&Sinterrupt_process
);
4597 defsubr (&Skill_process
);
4598 defsubr (&Squit_process
);
4599 defsubr (&Sstop_process
);
4600 defsubr (&Scontinue_process
);
4601 defsubr (&Sprocess_running_child_p
);
4602 defsubr (&Sprocess_send_eof
);
4603 defsubr (&Ssignal_process
);
4604 defsubr (&Swaiting_for_user_input_p
);
4605 /* defsubr (&Sprocess_connection); */
4606 defsubr (&Sset_process_coding_system
);
4607 defsubr (&Sprocess_coding_system
);
4611 #else /* not subprocesses */
4613 #include <sys/types.h>
4617 #include "systime.h"
4618 #include "charset.h"
4620 #include "termopts.h"
4621 #include "sysselect.h"
4623 extern int frame_garbaged
;
4625 extern EMACS_TIME
timer_check ();
4626 extern int timers_run
;
4628 /* As described above, except assuming that there are no subprocesses:
4630 Wait for timeout to elapse and/or keyboard input to be available.
4633 timeout in seconds, or
4634 zero for no limit, or
4635 -1 means gobble data immediately available but don't wait for any.
4637 read_kbd is a Lisp_Object:
4638 0 to ignore keyboard input, or
4639 1 to return when input is available, or
4640 -1 means caller will actually read the input, so don't throw to
4642 a cons cell, meaning wait until its car is non-nil
4643 (and gobble terminal input into the buffer if any arrives), or
4644 We know that read_kbd will never be a Lisp_Process, since
4645 `subprocesses' isn't defined.
4647 do_display != 0 means redisplay should be done to show subprocess
4648 output that arrives.
4650 Return true iff we received input from any process. */
4653 wait_reading_process_input (time_limit
, microsecs
, read_kbd
, do_display
)
4654 int time_limit
, microsecs
;
4655 Lisp_Object read_kbd
;
4659 EMACS_TIME end_time
, timeout
;
4660 SELECT_TYPE waitchannels
;
4662 Lisp_Object
*wait_for_cell
= 0;
4664 /* If waiting for non-nil in a cell, record where. */
4665 if (CONSP (read_kbd
))
4667 wait_for_cell
= &XCONS (read_kbd
)->car
;
4668 XSETFASTINT (read_kbd
, 0);
4671 /* What does time_limit really mean? */
4672 if (time_limit
|| microsecs
)
4674 EMACS_GET_TIME (end_time
);
4675 EMACS_SET_SECS_USECS (timeout
, time_limit
, microsecs
);
4676 EMACS_ADD_TIME (end_time
, end_time
, timeout
);
4679 /* Turn off periodic alarms (in case they are in use)
4680 because the select emulator uses alarms. */
4685 int timeout_reduced_for_timers
= 0;
4687 /* If calling from keyboard input, do not quit
4688 since we want to return C-g as an input character.
4689 Otherwise, do pending quit if requested. */
4690 if (XINT (read_kbd
) >= 0)
4693 /* Exit now if the cell we're waiting for became non-nil. */
4694 if (wait_for_cell
&& ! NILP (*wait_for_cell
))
4697 /* Compute time from now till when time limit is up */
4698 /* Exit if already run out */
4699 if (time_limit
== -1)
4701 /* -1 specified for timeout means
4702 gobble output available now
4703 but don't wait at all. */
4705 EMACS_SET_SECS_USECS (timeout
, 0, 0);
4707 else if (time_limit
|| microsecs
)
4709 EMACS_GET_TIME (timeout
);
4710 EMACS_SUB_TIME (timeout
, end_time
, timeout
);
4711 if (EMACS_TIME_NEG_P (timeout
))
4716 EMACS_SET_SECS_USECS (timeout
, 100000, 0);
4719 /* If our caller will not immediately handle keyboard events,
4720 run timer events directly.
4721 (Callers that will immediately read keyboard events
4722 call timer_delay on their own.) */
4723 if (! wait_for_cell
)
4725 EMACS_TIME timer_delay
;
4729 old_timers_run
= timers_run
;
4730 timer_delay
= timer_check (1);
4731 if (timers_run
!= old_timers_run
&& do_display
)
4733 redisplay_preserve_echo_area ();
4734 /* We must retry, since a timer may have requeued itself
4735 and that could alter the time delay. */
4739 /* If there is unread keyboard input, also return. */
4740 if (XINT (read_kbd
) != 0
4741 && requeued_events_pending_p ())
4744 if (! EMACS_TIME_NEG_P (timer_delay
) && time_limit
!= -1)
4746 EMACS_TIME difference
;
4747 EMACS_SUB_TIME (difference
, timer_delay
, timeout
);
4748 if (EMACS_TIME_NEG_P (difference
))
4750 timeout
= timer_delay
;
4751 timeout_reduced_for_timers
= 1;
4756 /* Cause C-g and alarm signals to take immediate action,
4757 and cause input available signals to zero out timeout. */
4758 if (XINT (read_kbd
) < 0)
4759 set_waiting_for_input (&timeout
);
4761 /* Wait till there is something to do. */
4763 if (! XINT (read_kbd
) && wait_for_cell
== 0)
4764 FD_ZERO (&waitchannels
);
4766 FD_SET (0, &waitchannels
);
4768 /* If a frame has been newly mapped and needs updating,
4769 reprocess its display stuff. */
4770 if (frame_garbaged
&& do_display
)
4772 clear_waiting_for_input ();
4773 redisplay_preserve_echo_area ();
4774 if (XINT (read_kbd
) < 0)
4775 set_waiting_for_input (&timeout
);
4778 if (XINT (read_kbd
) && detect_input_pending ())
4781 FD_ZERO (&waitchannels
);
4784 nfds
= select (1, &waitchannels
, (SELECT_TYPE
*)0, (SELECT_TYPE
*)0,
4789 /* Make C-g and alarm signals set flags again */
4790 clear_waiting_for_input ();
4792 /* If we woke up due to SIGWINCH, actually change size now. */
4793 do_pending_window_change ();
4795 if (time_limit
&& nfds
== 0 && ! timeout_reduced_for_timers
)
4796 /* We waited the full specified time, so return now. */
4801 /* If the system call was interrupted, then go around the
4803 if (xerrno
== EINTR
)
4804 FD_ZERO (&waitchannels
);
4806 error ("select error: %s", strerror (xerrno
));
4809 else if (nfds
> 0 && (waitchannels
& 1) && interrupt_input
)
4810 /* System sometimes fails to deliver SIGIO. */
4811 kill (getpid (), SIGIO
);
4814 if (XINT (read_kbd
) && interrupt_input
&& (waitchannels
& 1))
4815 kill (getpid (), SIGIO
);
4818 /* Check for keyboard input */
4820 if ((XINT (read_kbd
) != 0)
4821 && detect_input_pending_run_timers (do_display
))
4823 swallow_events (do_display
);
4824 if (detect_input_pending_run_timers (do_display
))
4828 /* If there is unread keyboard input, also return. */
4829 if (XINT (read_kbd
) != 0
4830 && requeued_events_pending_p ())
4833 /* If wait_for_cell. check for keyboard input
4834 but don't run any timers.
4835 ??? (It seems wrong to me to check for keyboard
4836 input at all when wait_for_cell, but the code
4837 has been this way since July 1994.
4838 Try changing this after version 19.31.) */
4840 && detect_input_pending ())
4842 swallow_events (do_display
);
4843 if (detect_input_pending ())
4847 /* Exit now if the cell we're waiting for became non-nil. */
4848 if (wait_for_cell
&& ! NILP (*wait_for_cell
))
4858 DEFUN ("get-buffer-process", Fget_buffer_process
, Sget_buffer_process
, 1, 1, 0,
4859 /* Don't confuse make-docfile by having two doc strings for this function.
4860 make-docfile does not pay attention to #if, for good reason! */
4863 register Lisp_Object name
;
4868 DEFUN ("process-inherit-coding-system-flag",
4869 Fprocess_inherit_coding_system_flag
, Sprocess_inherit_coding_system_flag
,
4871 /* Don't confuse make-docfile by having two doc strings for this function.
4872 make-docfile does not pay attention to #if, for good reason! */
4875 register Lisp_Object process
;
4877 /* Ignore the argument and return the value of
4878 inherit-process-coding-system. */
4879 return inherit_process_coding_system
? Qt
: Qnil
;
4882 /* Kill all processes associated with `buffer'.
4883 If `buffer' is nil, kill all processes.
4884 Since we have no subprocesses, this does nothing. */
4887 kill_buffer_processes (buffer
)
4900 defsubr (&Sget_buffer_process
);
4901 defsubr (&Sprocess_inherit_coding_system_flag
);
4905 #endif /* not subprocesses */