1 /* Asynchronous subprocess control for GNU Emacs.
2 Copyright (C) 1985, 86, 87, 88, 93, 94 Free Software Foundation, Inc.
4 This file is part of GNU Emacs.
6 GNU Emacs is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU Emacs is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU Emacs; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
25 /* This file is split into two parts by the following preprocessor
26 conditional. The 'then' clause contains all of the support for
27 asynchronous subprocesses. The 'else' clause contains stub
28 versions of some of the asynchronous subprocess routines that are
29 often called elsewhere in Emacs, so we don't have to #ifdef the
30 sections that call them. */
38 #include <sys/types.h> /* some typedefs are used in sys/file.h */
45 #ifdef HAVE_SOCKETS /* TCP connection support, if kernel can do it */
46 #include <sys/socket.h>
48 #include <netinet/in.h>
49 #include <arpa/inet.h>
50 #endif /* HAVE_SOCKETS */
52 /* TERM is a poor-man's SLIP, used on Linux. */
57 /* On some systems, e.g. DGUX, inet_addr returns a 'struct in_addr'. */
58 #ifdef HAVE_BROKEN_INET_ADDR
59 #define IN_ADDR struct in_addr
60 #define NUMERIC_ADDR_ERROR (numeric_addr.s_addr == -1)
62 #define IN_ADDR unsigned long
63 #define NUMERIC_ADDR_ERROR (numeric_addr == -1)
66 #if defined(BSD) || defined(STRIDE)
67 #include <sys/ioctl.h>
68 #if !defined (O_NDELAY) && defined (HAVE_PTYS) && !defined(USG5)
70 #endif /* HAVE_PTYS and no O_NDELAY */
71 #endif /* BSD or STRIDE */
73 #ifdef BROKEN_O_NONBLOCK
75 #endif /* BROKEN_O_NONBLOCK */
82 #include <sys/sysmacros.h> /* for "minor" */
92 #include "termhooks.h"
97 Lisp_Object Qprocessp
;
98 Lisp_Object Qrun
, Qstop
, Qsignal
, Qopen
, Qclosed
;
99 /* Qexit is declared and initialized in eval.c. */
101 /* a process object is a network connection when its childp field is neither
102 Qt nor Qnil but is instead a string (name of foreign host we
103 are connected to + name of port we are connected to) */
106 static Lisp_Object stream_process
;
108 #define NETCONN_P(p) (XGCTYPE (XPROCESS (p)->childp) == Lisp_String)
110 #define NETCONN_P(p) 0
111 #endif /* HAVE_SOCKETS */
113 /* Define first descriptor number available for subprocesses. */
115 #define FIRST_PROC_DESC 1
117 #define FIRST_PROC_DESC 3
120 /* Define SIGCHLD as an alias for SIGCLD. There are many conditionals
123 #if !defined (SIGCHLD) && defined (SIGCLD)
124 #define SIGCHLD SIGCLD
127 #include "syssignal.h"
132 extern char *strerror ();
134 extern char *sys_errlist
[];
137 #ifndef SYS_SIGLIST_DECLARED
141 extern char *sys_siglist
[];
142 #endif /* not LINUX */
144 char *sys_siglist
[] =
150 "illegal instruction",
154 "floating point exception",
157 "segmentation violation",
158 "bad argument to system call",
159 "write on a pipe with no one to read it",
161 "software termination signal from kill",
163 "sendable stop signal not from tty",
164 "stop signal from tty",
165 "continue a stopped process",
166 "child status has changed",
167 "background read attempted from control tty",
168 "background write attempted from control tty",
169 "input record available at control tty",
170 "exceeded CPU time limit",
171 "exceeded file size limit"
175 #endif /* ! SYS_SIGLIST_DECLARED */
177 /* t means use pty, nil means use a pipe,
178 maybe other values to come. */
179 static Lisp_Object Vprocess_connection_type
;
183 #include <sys/socket.h>
187 /* Number of events of change of status of a process. */
188 static int process_tick
;
190 /* Number of events for which the user or sentinel has been notified. */
191 static int update_tick
;
194 /* We could get this from param.h, but better not to depend on finding that.
195 And better not to risk that it might define other symbols used in this
198 #define MAXDESC FD_SETSIZE
202 #define SELECT_TYPE fd_set
203 #else /* no FD_SET */
205 #define SELECT_TYPE int
207 /* Define the macros to access a single-int bitmap of descriptors. */
208 #define FD_SET(n, p) (*(p) |= (1 << (n)))
209 #define FD_CLR(n, p) (*(p) &= ~(1 << (n)))
210 #define FD_ISSET(n, p) (*(p) & (1 << (n)))
211 #define FD_ZERO(p) (*(p) = 0)
212 #endif /* no FD_SET */
214 /* If we support X Windows, turn on the code to poll periodically
215 to detect C-g. It isn't actually used when doing interrupt input. */
216 #ifdef HAVE_X_WINDOWS
217 #define POLL_FOR_INPUT
220 /* Mask of bits indicating the descriptors that we wait for input on */
222 static SELECT_TYPE input_wait_mask
;
224 /* The largest descriptor currently in use for a process object. */
225 static int max_process_desc
;
227 /* Descriptor to use for keyboard input. */
228 static int keyboard_descriptor
;
230 /* Nonzero means delete a process right away if it exits. */
231 static int delete_exited_processes
;
233 /* Indexed by descriptor, gives the process (if any) for that descriptor */
234 Lisp_Object chan_process
[MAXDESC
];
236 /* Alist of elements (NAME . PROCESS) */
237 Lisp_Object Vprocess_alist
;
239 /* Buffered-ahead input char from process, indexed by channel.
240 -1 means empty (no char is buffered).
241 Used on sys V where the only way to tell if there is any
242 output from the process is to read at least one char.
243 Always -1 on systems that support FIONREAD. */
245 static int proc_buffered_char
[MAXDESC
];
247 static Lisp_Object
get_process ();
249 /* Maximum number of bytes to send to a pty without an eof. */
250 static int pty_max_bytes
;
252 /* Compute the Lisp form of the process status, p->status, from
253 the numeric status that was returned by `wait'. */
255 Lisp_Object
status_convert ();
258 struct Lisp_Process
*p
;
260 union { int i
; WAITTYPE wt
; } u
;
261 u
.i
= XFASTINT (p
->raw_status_low
) + (XFASTINT (p
->raw_status_high
) << 16);
262 p
->status
= status_convert (u
.wt
);
263 p
->raw_status_low
= Qnil
;
264 p
->raw_status_high
= Qnil
;
267 /* Convert a process status word in Unix format to
268 the list that we use internally. */
275 return Fcons (Qstop
, Fcons (make_number (WSTOPSIG (w
)), Qnil
));
276 else if (WIFEXITED (w
))
277 return Fcons (Qexit
, Fcons (make_number (WRETCODE (w
)),
278 WCOREDUMP (w
) ? Qt
: Qnil
));
279 else if (WIFSIGNALED (w
))
280 return Fcons (Qsignal
, Fcons (make_number (WTERMSIG (w
)),
281 WCOREDUMP (w
) ? Qt
: Qnil
));
286 /* Given a status-list, extract the three pieces of information
287 and store them individually through the three pointers. */
290 decode_status (l
, symbol
, code
, coredump
)
298 if (XTYPE (l
) == Lisp_Symbol
)
306 *symbol
= XCONS (l
)->car
;
307 tem
= XCONS (l
)->cdr
;
308 *code
= XFASTINT (XCONS (tem
)->car
);
309 tem
= XCONS (tem
)->cdr
;
310 *coredump
= !NILP (tem
);
314 /* Return a string describing a process status list. */
317 status_message (status
)
322 Lisp_Object string
, string2
;
324 decode_status (status
, &symbol
, &code
, &coredump
);
326 if (EQ (symbol
, Qsignal
) || EQ (symbol
, Qstop
))
332 signame
= sys_siglist
[code
];
334 signame
= sys_errlist
[code
];
339 string
= build_string (signame
);
340 string2
= build_string (coredump
? " (core dumped)\n" : "\n");
341 XSTRING (string
)->data
[0] = DOWNCASE (XSTRING (string
)->data
[0]);
342 return concat2 (string
, string2
);
344 else if (EQ (symbol
, Qexit
))
347 return build_string ("finished\n");
348 string
= Fnumber_to_string (make_number (code
));
349 string2
= build_string (coredump
? " (core dumped)\n" : "\n");
350 return concat2 (build_string ("exited abnormally with code "),
351 concat2 (string
, string2
));
354 return Fcopy_sequence (Fsymbol_name (symbol
));
359 /* Open an available pty, returning a file descriptor.
360 Return -1 on failure.
361 The file name of the terminal corresponding to the pty
362 is left in the variable pty_name. */
373 /* Some systems name their pseudoterminals so that there are gaps in
374 the usual sequence - for example, on HP9000/S700 systems, there
375 are no pseudoterminals with names ending in 'f'. So we wait for
376 three failures in a row before deciding that we've reached the
378 int failed_count
= 0;
383 for (c
= FIRST_PTY_LETTER
; c
<= 'z'; c
++)
384 for (i
= 0; i
< 16; i
++)
387 #ifdef PTY_NAME_SPRINTF
390 sprintf (pty_name
, "/dev/pty%c%x", c
, i
);
391 #endif /* no PTY_NAME_SPRINTF */
395 #else /* no PTY_OPEN */
397 /* Unusual IRIS code */
398 *ptyv
= open ("/dev/ptc", O_RDWR
| O_NDELAY
, 0);
401 if (fstat (fd
, &stb
) < 0)
404 if (stat (pty_name
, &stb
) < 0)
407 if (failed_count
>= 3)
413 fd
= open (pty_name
, O_RDWR
| O_NONBLOCK
, 0);
415 fd
= open (pty_name
, O_RDWR
| O_NDELAY
, 0);
417 #endif /* not IRIS */
418 #endif /* no PTY_OPEN */
422 /* check to make certain that both sides are available
423 this avoids a nasty yet stupid bug in rlogins */
424 #ifdef PTY_TTY_NAME_SPRINTF
427 sprintf (pty_name
, "/dev/tty%c%x", c
, i
);
428 #endif /* no PTY_TTY_NAME_SPRINTF */
430 if (access (pty_name
, 6) != 0)
433 #if !defined(IRIS) && !defined(__sgi)
439 #endif /* not UNIPLUS */
446 #endif /* HAVE_PTYS */
452 register Lisp_Object val
, tem
, name1
;
453 register struct Lisp_Process
*p
;
457 /* size of process structure includes the vector header,
458 so deduct for that. But struct Lisp_Vector includes the first
459 element, thus deducts too much, so add it back. */
460 val
= Fmake_vector (make_number ((sizeof (struct Lisp_Process
)
461 - sizeof (struct Lisp_Vector
)
462 + sizeof (Lisp_Object
))
463 / sizeof (Lisp_Object
)),
465 XSETTYPE (val
, Lisp_Process
);
468 XSET (p
->infd
, Lisp_Int
, -1);
469 XSET (p
->outfd
, Lisp_Int
, -1);
470 XFASTINT (p
->pid
) = 0;
471 XFASTINT (p
->tick
) = 0;
472 XFASTINT (p
->update_tick
) = 0;
473 p
->raw_status_low
= Qnil
;
474 p
->raw_status_high
= Qnil
;
476 p
->mark
= Fmake_marker ();
478 /* If name is already in use, modify it until it is unused. */
483 tem
= Fget_process (name1
);
484 if (NILP (tem
)) break;
485 sprintf (suffix
, "<%d>", i
);
486 name1
= concat2 (name
, build_string (suffix
));
490 Vprocess_alist
= Fcons (Fcons (name
, val
), Vprocess_alist
);
494 remove_process (proc
)
495 register Lisp_Object proc
;
497 register Lisp_Object pair
;
499 pair
= Frassq (proc
, Vprocess_alist
);
500 Vprocess_alist
= Fdelq (pair
, Vprocess_alist
);
501 Fset_marker (XPROCESS (proc
)->mark
, Qnil
, Qnil
);
503 deactivate_process (proc
);
506 DEFUN ("processp", Fprocessp
, Sprocessp
, 1, 1, 0,
507 "Return t if OBJECT is a process.")
511 return XTYPE (obj
) == Lisp_Process
? Qt
: Qnil
;
514 DEFUN ("get-process", Fget_process
, Sget_process
, 1, 1, 0,
515 "Return the process named NAME, or nil if there is none.")
517 register Lisp_Object name
;
519 if (XTYPE (name
) == Lisp_Process
)
521 CHECK_STRING (name
, 0);
522 return Fcdr (Fassoc (name
, Vprocess_alist
));
525 DEFUN ("get-buffer-process", Fget_buffer_process
, Sget_buffer_process
, 1, 1, 0,
526 "Return the (or, a) process associated with BUFFER.\n\
527 BUFFER may be a buffer or the name of one.")
529 register Lisp_Object name
;
531 register Lisp_Object buf
, tail
, proc
;
533 if (NILP (name
)) return Qnil
;
534 buf
= Fget_buffer (name
);
535 if (NILP (buf
)) return Qnil
;
537 for (tail
= Vprocess_alist
; !NILP (tail
); tail
= Fcdr (tail
))
539 proc
= Fcdr (Fcar (tail
));
540 if (XTYPE (proc
) == Lisp_Process
&& EQ (XPROCESS (proc
)->buffer
, buf
))
546 /* This is how commands for the user decode process arguments. It
547 accepts a process, a process name, a buffer, a buffer name, or nil.
548 Buffers denote the first process in the buffer, and nil denotes the
553 register Lisp_Object name
;
555 register Lisp_Object proc
, obj
;
558 obj
= Fget_process (name
);
560 obj
= Fget_buffer (name
);
562 error ("Process %s does not exist", XSTRING (name
)->data
);
564 else if (NILP (name
))
565 obj
= Fcurrent_buffer ();
569 /* Now obj should be either a buffer object or a process object.
573 proc
= Fget_buffer_process (obj
);
575 error ("Buffer %s has no process", XSTRING (XBUFFER (obj
)->name
)->data
);
579 CHECK_PROCESS (obj
, 0);
585 DEFUN ("delete-process", Fdelete_process
, Sdelete_process
, 1, 1, 0,
586 "Delete PROCESS: kill it and forget about it immediately.\n\
587 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
588 nil, indicating the current buffer's process.")
590 register Lisp_Object proc
;
592 proc
= get_process (proc
);
593 XPROCESS (proc
)->raw_status_low
= Qnil
;
594 XPROCESS (proc
)->raw_status_high
= Qnil
;
595 if (NETCONN_P (proc
))
597 XPROCESS (proc
)->status
= Fcons (Qexit
, Fcons (make_number (0), Qnil
));
598 XSETINT (XPROCESS (proc
)->tick
, ++process_tick
);
600 else if (XINT (XPROCESS (proc
)->infd
) >= 0)
602 Fkill_process (proc
, Qnil
);
603 /* Do this now, since remove_process will make sigchld_handler do nothing. */
604 XPROCESS (proc
)->status
605 = Fcons (Qsignal
, Fcons (make_number (SIGKILL
), Qnil
));
606 XSETINT (XPROCESS (proc
)->tick
, ++process_tick
);
609 remove_process (proc
);
613 DEFUN ("process-status", Fprocess_status
, Sprocess_status
, 1, 1, 0,
614 "Return the status of PROCESS: a symbol, one of these:\n\
615 run -- for a process that is running.\n\
616 stop -- for a process stopped but continuable.\n\
617 exit -- for a process that has exited.\n\
618 signal -- for a process that has got a fatal signal.\n\
619 open -- for a network stream connection that is open.\n\
620 closed -- for a network stream connection that is closed.\n\
621 nil -- if arg is a process name and no such process exists.\n\
622 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
623 nil, indicating the current buffer's process.")
625 register Lisp_Object proc
;
627 register struct Lisp_Process
*p
;
628 register Lisp_Object status
;
629 proc
= get_process (proc
);
633 if (!NILP (p
->raw_status_low
))
636 if (XTYPE (status
) == Lisp_Cons
)
637 status
= XCONS (status
)->car
;
638 if (NETCONN_P (proc
))
640 if (EQ (status
, Qrun
))
642 else if (EQ (status
, Qexit
))
648 DEFUN ("process-exit-status", Fprocess_exit_status
, Sprocess_exit_status
,
650 "Return the exit status of PROCESS or the signal number that killed it.\n\
651 If PROCESS has not yet exited or died, return 0.")
653 register Lisp_Object proc
;
655 CHECK_PROCESS (proc
, 0);
656 if (!NILP (XPROCESS (proc
)->raw_status_low
))
657 update_status (XPROCESS (proc
));
658 if (XTYPE (XPROCESS (proc
)->status
) == Lisp_Cons
)
659 return XCONS (XCONS (XPROCESS (proc
)->status
)->cdr
)->car
;
660 return make_number (0);
663 DEFUN ("process-id", Fprocess_id
, Sprocess_id
, 1, 1, 0,
664 "Return the process id of PROCESS.\n\
665 This is the pid of the Unix process which PROCESS uses or talks to.\n\
666 For a network connection, this value is nil.")
668 register Lisp_Object proc
;
670 CHECK_PROCESS (proc
, 0);
671 return XPROCESS (proc
)->pid
;
674 DEFUN ("process-name", Fprocess_name
, Sprocess_name
, 1, 1, 0,
675 "Return the name of PROCESS, as a string.\n\
676 This is the name of the program invoked in PROCESS,\n\
677 possibly modified to make it unique among process names.")
679 register Lisp_Object proc
;
681 CHECK_PROCESS (proc
, 0);
682 return XPROCESS (proc
)->name
;
685 DEFUN ("process-command", Fprocess_command
, Sprocess_command
, 1, 1, 0,
686 "Return the command that was executed to start PROCESS.\n\
687 This is a list of strings, the first string being the program executed\n\
688 and the rest of the strings being the arguments given to it.\n\
689 For a non-child channel, this is nil.")
691 register Lisp_Object proc
;
693 CHECK_PROCESS (proc
, 0);
694 return XPROCESS (proc
)->command
;
697 DEFUN ("set-process-buffer", Fset_process_buffer
, Sset_process_buffer
,
699 "Set buffer associated with PROCESS to BUFFER (a buffer, or nil).")
701 register Lisp_Object proc
, buffer
;
703 CHECK_PROCESS (proc
, 0);
705 CHECK_BUFFER (buffer
, 1);
706 XPROCESS (proc
)->buffer
= buffer
;
710 DEFUN ("process-buffer", Fprocess_buffer
, Sprocess_buffer
,
712 "Return the buffer PROCESS is associated with.\n\
713 Output from PROCESS is inserted in this buffer\n\
714 unless PROCESS has a filter.")
716 register Lisp_Object proc
;
718 CHECK_PROCESS (proc
, 0);
719 return XPROCESS (proc
)->buffer
;
722 DEFUN ("process-mark", Fprocess_mark
, Sprocess_mark
,
724 "Return the marker for the end of the last output from PROCESS.")
726 register Lisp_Object proc
;
728 CHECK_PROCESS (proc
, 0);
729 return XPROCESS (proc
)->mark
;
732 DEFUN ("set-process-filter", Fset_process_filter
, Sset_process_filter
,
734 "Give PROCESS the filter function FILTER; nil means no filter.\n\
735 t means stop accepting output from the process.\n\
736 When a process has a filter, each time it does output\n\
737 the entire string of output is passed to the filter.\n\
738 The filter gets two arguments: the process and the string of output.\n\
739 If the process has a filter, its buffer is not used for output.")
741 register Lisp_Object proc
, filter
;
743 CHECK_PROCESS (proc
, 0);
745 FD_CLR (XINT (XPROCESS (proc
)->infd
), &input_wait_mask
);
746 else if (EQ (XPROCESS (proc
)->filter
, Qt
))
747 FD_SET (XINT (XPROCESS (proc
)->infd
), &input_wait_mask
);
748 XPROCESS (proc
)->filter
= filter
;
752 DEFUN ("process-filter", Fprocess_filter
, Sprocess_filter
,
754 "Returns the filter function of PROCESS; nil if none.\n\
755 See `set-process-filter' for more info on filter functions.")
757 register Lisp_Object proc
;
759 CHECK_PROCESS (proc
, 0);
760 return XPROCESS (proc
)->filter
;
763 DEFUN ("set-process-sentinel", Fset_process_sentinel
, Sset_process_sentinel
,
765 "Give PROCESS the sentinel SENTINEL; nil for none.\n\
766 The sentinel is called as a function when the process changes state.\n\
767 It gets two arguments: the process, and a string describing the change.")
769 register Lisp_Object proc
, sentinel
;
771 CHECK_PROCESS (proc
, 0);
772 XPROCESS (proc
)->sentinel
= sentinel
;
776 DEFUN ("process-sentinel", Fprocess_sentinel
, Sprocess_sentinel
,
778 "Return the sentinel of PROCESS; nil if none.\n\
779 See `set-process-sentinel' for more info on sentinels.")
781 register Lisp_Object proc
;
783 CHECK_PROCESS (proc
, 0);
784 return XPROCESS (proc
)->sentinel
;
787 DEFUN ("set-process-window-size", Fset_process_window_size
,
788 Sset_process_window_size
, 3, 3, 0,
789 "Tell PROCESS that it has logical window size HEIGHT and WIDTH.")
790 (proc
, height
, width
)
791 register Lisp_Object proc
, height
, width
;
793 CHECK_PROCESS (proc
, 0);
794 CHECK_NATNUM (height
, 0);
795 CHECK_NATNUM (width
, 0);
796 if (set_window_size (XINT (XPROCESS (proc
)->infd
),
797 XINT (height
), XINT(width
)) <= 0)
803 DEFUN ("process-kill-without-query", Fprocess_kill_without_query
,
804 Sprocess_kill_without_query
, 1, 2, 0,
805 "Say no query needed if PROCESS is running when Emacs is exited.\n\
806 Optional second argument if non-nil says to require a query.\n\
807 Value is t if a query was formerly required.")
809 register Lisp_Object proc
, value
;
813 CHECK_PROCESS (proc
, 0);
814 tem
= XPROCESS (proc
)->kill_without_query
;
815 XPROCESS (proc
)->kill_without_query
= Fnull (value
);
820 #if 0 /* Turned off because we don't currently record this info
821 in the process. Perhaps add it. */
822 DEFUN ("process-connection", Fprocess_connection
, Sprocess_connection
, 1, 1, 0,
823 "Return the connection type of `PROCESS'.\n\
824 The value is `nil' for a pipe,\n\
825 `t' or `pty' for a pty, or `stream' for a socket connection.")
829 return XPROCESS (process
)->type
;
836 register Lisp_Object tail
, tem
;
837 Lisp_Object proc
, minspace
, tem1
;
838 register struct buffer
*old
= current_buffer
;
839 register struct Lisp_Process
*p
;
843 XFASTINT (minspace
) = 1;
845 set_buffer_internal (XBUFFER (Vstandard_output
));
846 Fbuffer_disable_undo (Vstandard_output
);
848 current_buffer
->truncate_lines
= Qt
;
851 Proc Status Buffer Command\n\
852 ---- ------ ------ -------\n", -1);
854 for (tail
= Vprocess_alist
; !NILP (tail
); tail
= Fcdr (tail
))
858 proc
= Fcdr (Fcar (tail
));
860 if (NILP (p
->childp
))
863 Finsert (1, &p
->name
);
864 Findent_to (make_number (13), minspace
);
866 if (!NILP (p
->raw_status_low
))
869 if (XTYPE (p
->status
) == Lisp_Cons
)
870 symbol
= XCONS (p
->status
)->car
;
873 if (EQ (symbol
, Qsignal
))
876 tem
= Fcar (Fcdr (p
->status
));
878 if (XINT (tem
) < NSIG
)
879 write_string (sys_errlist
[XINT (tem
)], -1);
882 Fprinc (symbol
, Qnil
);
884 else if (NETCONN_P (proc
))
886 if (EQ (symbol
, Qrun
))
887 write_string ("open", -1);
888 else if (EQ (symbol
, Qexit
))
889 write_string ("closed", -1);
891 Fprinc (symbol
, Qnil
);
894 Fprinc (symbol
, Qnil
);
896 if (EQ (symbol
, Qexit
))
899 tem
= Fcar (Fcdr (p
->status
));
902 sprintf (tembuf
, " %d", XFASTINT (tem
));
903 write_string (tembuf
, -1);
907 if (EQ (symbol
, Qsignal
) || EQ (symbol
, Qexit
))
908 remove_process (proc
);
910 Findent_to (make_number (22), minspace
);
911 if (NILP (p
->buffer
))
912 insert_string ("(none)");
913 else if (NILP (XBUFFER (p
->buffer
)->name
))
914 insert_string ("(Killed)");
916 Finsert (1, &XBUFFER (p
->buffer
)->name
);
918 Findent_to (make_number (37), minspace
);
920 if (NETCONN_P (proc
))
922 sprintf (tembuf
, "(network stream connection to %s)\n",
923 XSTRING (p
->childp
)->data
);
924 insert_string (tembuf
);
938 insert_string ("\n");
944 DEFUN ("list-processes", Flist_processes
, Slist_processes
, 0, 0, "",
945 "Display a list of all processes.\n\
946 \(Any processes listed as Exited or Signaled are actually eliminated\n\
947 after the listing is made.)")
950 internal_with_output_to_temp_buffer ("*Process List*",
951 list_processes_1
, Qnil
);
955 DEFUN ("process-list", Fprocess_list
, Sprocess_list
, 0, 0, 0,
956 "Return a list of all processes.")
959 return Fmapcar (Qcdr
, Vprocess_alist
);
962 /* Starting asynchronous inferior processes. */
964 static Lisp_Object
start_process_unwind ();
966 DEFUN ("start-process", Fstart_process
, Sstart_process
, 3, MANY
, 0,
967 "Start a program in a subprocess. Return the process object for it.\n\
968 Args are NAME BUFFER PROGRAM &rest PROGRAM-ARGS\n\
969 NAME is name for process. It is modified if necessary to make it unique.\n\
970 BUFFER is the buffer or (buffer-name) to associate with the process.\n\
971 Process output goes at end of that buffer, unless you specify\n\
972 an output stream or filter function to handle the output.\n\
973 BUFFER may be also nil, meaning that this process is not associated\n\
975 Third arg is program file name. It is searched for as in the shell.\n\
976 Remaining arguments are strings to give program as arguments.")
979 register Lisp_Object
*args
;
981 Lisp_Object buffer
, name
, program
, proc
, current_dir
, tem
;
983 register unsigned char *new_argv
;
986 register unsigned char **new_argv
;
989 int count
= specpdl_ptr
- specpdl
;
993 buffer
= Fget_buffer_create (buffer
);
995 /* Make sure that the child will be able to chdir to the current
996 buffer's current directory, or its unhandled equivalent. We
997 can't just have the child check for an error when it does the
998 chdir, since it's in a vfork.
1000 We have to GCPRO around this because Fexpand_file_name and
1001 Funhandled_file_name_directory might call a file name handling
1002 function. The argument list is protected by the caller, so all
1003 we really have to worry about is buffer. */
1005 struct gcpro gcpro1
, gcpro2
;
1007 current_dir
= current_buffer
->directory
;
1009 GCPRO2 (buffer
, current_dir
);
1012 expand_and_dir_to_file
1013 (Funhandled_file_name_directory (current_dir
), Qnil
);
1014 if (NILP (Ffile_accessible_directory_p (current_dir
)))
1015 report_file_error ("Setting current directory",
1016 Fcons (current_buffer
->directory
, Qnil
));
1022 CHECK_STRING (name
, 0);
1026 CHECK_STRING (program
, 2);
1029 /* Make a one member argv with all args concatenated
1030 together separated by a blank. */
1031 len
= XSTRING (program
)->size
+ 2;
1032 for (i
= 3; i
< nargs
; i
++)
1035 CHECK_STRING (tem
, i
);
1036 len
+= XSTRING (tem
)->size
+ 1; /* count the blank */
1038 new_argv
= (unsigned char *) alloca (len
);
1039 strcpy (new_argv
, XSTRING (program
)->data
);
1040 for (i
= 3; i
< nargs
; i
++)
1043 CHECK_STRING (tem
, i
);
1044 strcat (new_argv
, " ");
1045 strcat (new_argv
, XSTRING (tem
)->data
);
1047 /* Need to add code here to check for program existence on VMS */
1050 new_argv
= (unsigned char **) alloca ((nargs
- 1) * sizeof (char *));
1052 /* If program file name is not absolute, search our path for it */
1053 if (XSTRING (program
)->data
[0] != '/')
1055 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
;
1058 GCPRO4 (name
, program
, buffer
, current_dir
);
1059 openp (Vexec_path
, program
, EXEC_SUFFIXES
, &tem
, 1);
1062 report_file_error ("Searching for program", Fcons (program
, Qnil
));
1063 new_argv
[0] = XSTRING (tem
)->data
;
1066 new_argv
[0] = XSTRING (program
)->data
;
1068 for (i
= 3; i
< nargs
; i
++)
1071 CHECK_STRING (tem
, i
);
1072 new_argv
[i
- 2] = XSTRING (tem
)->data
;
1074 new_argv
[i
- 2] = 0;
1075 #endif /* not VMS */
1077 proc
= make_process (name
);
1078 /* If an error occurs and we can't start the process, we want to
1079 remove it from the process list. This means that each error
1080 check in create_process doesn't need to call remove_process
1081 itself; it's all taken care of here. */
1082 record_unwind_protect (start_process_unwind
, proc
);
1084 XPROCESS (proc
)->childp
= Qt
;
1085 XPROCESS (proc
)->command_channel_p
= Qnil
;
1086 XPROCESS (proc
)->buffer
= buffer
;
1087 XPROCESS (proc
)->sentinel
= Qnil
;
1088 XPROCESS (proc
)->filter
= Qnil
;
1089 XPROCESS (proc
)->command
= Flist (nargs
- 2, args
+ 2);
1091 create_process (proc
, new_argv
, current_dir
);
1093 return unbind_to (count
, proc
);
1096 /* This function is the unwind_protect form for Fstart_process. If
1097 PROC doesn't have its pid set, then we know someone has signalled
1098 an error and the process wasn't started successfully, so we should
1099 remove it from the process list. */
1101 start_process_unwind (proc
)
1104 if (XTYPE (proc
) != Lisp_Process
)
1107 /* Was PROC started successfully? */
1108 if (XINT (XPROCESS (proc
)->pid
) <= 0)
1109 remove_process (proc
);
1116 create_process_1 (signo
)
1120 /* USG systems forget handlers when they are used;
1121 must reestablish each time */
1122 signal (signo
, create_process_1
);
1126 #if 0 /* This doesn't work; see the note before sigchld_handler. */
1129 /* Mimic blocking of signals on system V, which doesn't really have it. */
1131 /* Nonzero means we got a SIGCHLD when it was supposed to be blocked. */
1132 int sigchld_deferred
;
1135 create_process_sigchld ()
1137 signal (SIGCHLD
, create_process_sigchld
);
1139 sigchld_deferred
= 1;
1145 #ifndef VMS /* VMS version of this function is in vmsproc.c. */
1146 create_process (process
, new_argv
, current_dir
)
1147 Lisp_Object process
;
1149 Lisp_Object current_dir
;
1151 int pid
, inchannel
, outchannel
, forkin
, forkout
;
1154 SIGTYPE (*sigchld
)();
1157 extern char **environ
;
1159 inchannel
= outchannel
= -1;
1162 if (!NILP (Vprocess_connection_type
))
1163 outchannel
= inchannel
= allocate_pty ();
1168 /* On USG systems it does not work to open the pty's tty here
1169 and then close and reopen it in the child. */
1171 /* Don't let this terminal become our controlling terminal
1172 (in case we don't have one). */
1173 forkout
= forkin
= open (pty_name
, O_RDWR
| O_NOCTTY
, 0);
1175 forkout
= forkin
= open (pty_name
, O_RDWR
, 0);
1178 report_file_error ("Opening pty", Qnil
);
1180 forkin
= forkout
= -1;
1181 #endif /* not USG */
1185 #endif /* HAVE_PTYS */
1188 if (socketpair (AF_UNIX
, SOCK_STREAM
, 0, sv
) < 0)
1189 report_file_error ("Opening socketpair", Qnil
);
1190 outchannel
= inchannel
= sv
[0];
1191 forkout
= forkin
= sv
[1];
1193 #else /* not SKTPAIR */
1202 #endif /* not SKTPAIR */
1205 /* Replaced by close_process_descs */
1206 set_exclusive_use (inchannel
);
1207 set_exclusive_use (outchannel
);
1210 /* Stride people say it's a mystery why this is needed
1211 as well as the O_NDELAY, but that it fails without this. */
1212 #if defined (STRIDE) || (defined (pfa) && defined (HAVE_PTYS))
1215 ioctl (inchannel
, FIONBIO
, &one
);
1220 fcntl (inchannel
, F_SETFL
, O_NONBLOCK
);
1223 fcntl (inchannel
, F_SETFL
, O_NDELAY
);
1227 /* Record this as an active process, with its channels.
1228 As a result, child_setup will close Emacs's side of the pipes. */
1229 chan_process
[inchannel
] = process
;
1230 XSET (XPROCESS (process
)->infd
, Lisp_Int
, inchannel
);
1231 XSET (XPROCESS (process
)->outfd
, Lisp_Int
, outchannel
);
1232 /* Record the tty descriptor used in the subprocess. */
1234 XPROCESS (process
)->subtty
= Qnil
;
1236 XFASTINT (XPROCESS (process
)->subtty
) = forkin
;
1237 XPROCESS (process
)->pty_flag
= (pty_flag
? Qt
: Qnil
);
1238 XPROCESS (process
)->status
= Qrun
;
1240 /* Delay interrupts until we have a chance to store
1241 the new fork's pid in its process structure */
1245 #else /* not BSD4_1 */
1246 #if defined (BSD) || defined (UNIPLUS) || defined (HPUX)
1247 sigsetmask (sigmask (SIGCHLD
));
1248 #else /* ordinary USG */
1250 sigchld_deferred
= 0;
1251 sigchld
= signal (SIGCHLD
, create_process_sigchld
);
1253 #endif /* ordinary USG */
1254 #endif /* not BSD4_1 */
1255 #endif /* SIGCHLD */
1257 /* Until we store the proper pid, enable sigchld_handler
1258 to recognize an unknown pid as standing for this process.
1259 It is very important not to let this `marker' value stay
1260 in the table after this function has returned; if it does
1261 it might cause call-process to hang and subsequent asynchronous
1262 processes to get their return values scrambled. */
1263 XSETINT (XPROCESS (process
)->pid
, -1);
1266 /* child_setup must clobber environ on systems with true vfork.
1267 Protect it from permanent change. */
1268 char **save_environ
= environ
;
1273 int xforkin
= forkin
;
1274 int xforkout
= forkout
;
1276 #if 0 /* This was probably a mistake--it duplicates code later on,
1277 but fails to handle all the cases. */
1278 /* Make sure SIGCHLD is not blocked in the child. */
1279 sigsetmask (SIGEMPTYMASK
);
1282 /* Make the pty be the controlling terminal of the process. */
1284 /* First, disconnect its current controlling terminal. */
1286 /* We tried doing setsid only if pty_flag, but it caused
1287 process_set_signal to fail on SGI when using a pipe. */
1289 /* Make the pty's terminal the controlling terminal. */
1293 /* We ignore the return value
1294 because faith@cs.unc.edu says that is necessary on Linux. */
1295 ioctl (xforkin
, TIOCSCTTY
, 0);
1298 #else /* not HAVE_SETSID */
1300 /* It's very important to call setpgrp here and no time
1301 afterwards. Otherwise, we lose our controlling tty which
1302 is set when we open the pty. */
1305 #endif /* not HAVE_SETSID */
1306 #if defined (HAVE_TERMIOS) && defined (LDISC1)
1307 if (pty_flag
&& xforkin
>= 0)
1310 tcgetattr (xforkin
, &t
);
1312 if (tcsetattr (xforkin
, TCSANOW
, &t
) < 0)
1313 write (1, "create_process/tcsetattr LDISC1 failed\n", 39);
1316 #if defined (NTTYDISC) && defined (TIOCSETD)
1317 if (pty_flag
&& xforkin
>= 0)
1319 /* Use new line discipline. */
1320 int ldisc
= NTTYDISC
;
1321 ioctl (xforkin
, TIOCSETD
, &ldisc
);
1326 /* In 4.3BSD, the TIOCSPGRP bug has been fixed, and now you
1327 can do TIOCSPGRP only to the process's controlling tty. */
1330 /* I wonder: would just ioctl (0, TIOCNOTTY, 0) work here?
1331 I can't test it since I don't have 4.3. */
1332 int j
= open ("/dev/tty", O_RDWR
, 0);
1333 ioctl (j
, TIOCNOTTY
, 0);
1336 /* In order to get a controlling terminal on some versions
1337 of BSD, it is necessary to put the process in pgrp 0
1338 before it opens the terminal. */
1342 #endif /* TIOCNOTTY */
1344 #if !defined (RTU) && !defined (UNIPLUS)
1345 /*** There is a suggestion that this ought to be a
1346 conditional on TIOCSPGRP. */
1347 /* Now close the pty (if we had it open) and reopen it.
1348 This makes the pty the controlling terminal of the subprocess. */
1351 #ifdef SET_CHILD_PTY_PGRP
1352 int pgrp
= getpid ();
1355 /* I wonder if close (open (pty_name, ...)) would work? */
1358 xforkout
= xforkin
= open (pty_name
, O_RDWR
, 0);
1360 #ifdef SET_CHILD_PTY_PGRP
1361 ioctl (xforkin
, TIOCSPGRP
, &pgrp
);
1362 ioctl (xforkout
, TIOCSPGRP
, &pgrp
);
1368 #endif /* not UNIPLUS and not RTU */
1369 #ifdef SETUP_SLAVE_PTY
1374 #endif /* SETUP_SLAVE_PTY */
1376 /* On AIX, we've disabled SIGHUP above once we start a child on a pty.
1377 Now reenable it in the child, so it will die when we want it to. */
1379 signal (SIGHUP
, SIG_DFL
);
1381 #endif /* HAVE_PTYS */
1386 #else /* not BSD4_1 */
1387 #if defined (BSD) || defined (UNIPLUS) || defined (HPUX)
1388 sigsetmask (SIGEMPTYMASK
);
1389 #else /* ordinary USG */
1391 signal (SIGCHLD
, sigchld
);
1393 #endif /* ordinary USG */
1394 #endif /* not BSD4_1 */
1395 #endif /* SIGCHLD */
1398 child_setup_tty (xforkout
);
1399 child_setup (xforkin
, xforkout
, xforkout
,
1400 new_argv
, 1, current_dir
);
1402 environ
= save_environ
;
1409 if (forkin
!= forkout
&& forkout
>= 0)
1411 report_file_error ("Doing vfork", Qnil
);
1414 XFASTINT (XPROCESS (process
)->pid
) = pid
;
1416 FD_SET (inchannel
, &input_wait_mask
);
1417 if (inchannel
> max_process_desc
)
1418 max_process_desc
= inchannel
;
1420 /* If the subfork execv fails, and it exits,
1421 this close hangs. I don't know why.
1422 So have an interrupt jar it loose. */
1424 signal (SIGALRM
, create_process_1
);
1426 XPROCESS (process
)->subtty
= Qnil
;
1431 if (forkin
!= forkout
&& forkout
>= 0)
1437 #else /* not BSD4_1 */
1438 #if defined (BSD) || defined (UNIPLUS) || defined (HPUX)
1439 sigsetmask (SIGEMPTYMASK
);
1440 #else /* ordinary USG */
1442 signal (SIGCHLD
, sigchld
);
1443 /* Now really handle any of these signals
1444 that came in during this function. */
1445 if (sigchld_deferred
)
1446 kill (getpid (), SIGCHLD
);
1448 #endif /* ordinary USG */
1449 #endif /* not BSD4_1 */
1450 #endif /* SIGCHLD */
1452 #endif /* not VMS */
1456 /* open a TCP network connection to a given HOST/SERVICE. Treated
1457 exactly like a normal process when reading and writing. Only
1458 differences are in status display and process deletion. A network
1459 connection has no PID; you cannot signal it. All you can do is
1460 deactivate and close it via delete-process */
1462 DEFUN ("open-network-stream", Fopen_network_stream
, Sopen_network_stream
,
1464 "Open a TCP connection for a service to a host.\n\
1465 Returns a subprocess-object to represent the connection.\n\
1466 Input and output work as for subprocesses; `delete-process' closes it.\n\
1467 Args are NAME BUFFER HOST SERVICE.\n\
1468 NAME is name for process. It is modified if necessary to make it unique.\n\
1469 BUFFER is the buffer (or buffer-name) to associate with the process.\n\
1470 Process output goes at end of that buffer, unless you specify\n\
1471 an output stream or filter function to handle the output.\n\
1472 BUFFER may be also nil, meaning that this process is not associated\n\
1474 Third arg is name of the host to connect to, or its IP address.\n\
1475 Fourth arg SERVICE is name of the service desired, or an integer\n\
1476 specifying a port number to connect to.")
1477 (name
, buffer
, host
, service
)
1478 Lisp_Object name
, buffer
, host
, service
;
1482 struct sockaddr_in address
;
1483 struct servent
*svc_info
;
1484 struct hostent
*host_info_ptr
, host_info
;
1485 char *(addr_list
[2]);
1486 IN_ADDR numeric_addr
;
1490 struct hostent host_info_fixed
;
1491 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
;
1493 int count
= specpdl_ptr
- specpdl
;
1495 GCPRO4 (name
, buffer
, host
, service
);
1496 CHECK_STRING (name
, 0);
1497 CHECK_STRING (host
, 0);
1498 if (XTYPE (service
) == Lisp_Int
)
1499 port
= htons ((unsigned short) XINT (service
));
1502 CHECK_STRING (service
, 0);
1503 svc_info
= getservbyname (XSTRING (service
)->data
, "tcp");
1505 error ("Unknown service \"%s\"", XSTRING (service
)->data
);
1506 port
= svc_info
->s_port
;
1510 host_info_ptr
= gethostbyname (XSTRING (host
)->data
);
1511 if (host_info_ptr
== 0)
1512 /* Attempt to interpret host as numeric inet address */
1514 numeric_addr
= inet_addr ((char *) XSTRING (host
)->data
);
1515 if (NUMERIC_ADDR_ERROR
)
1516 error ("Unknown host \"%s\"", XSTRING (host
)->data
);
1518 host_info_ptr
= &host_info
;
1519 host_info
.h_name
= 0;
1520 host_info
.h_aliases
= 0;
1521 host_info
.h_addrtype
= AF_INET
;
1523 /* Older machines have only one address slot called h_addr.
1524 Newer machines have h_addr_list, but #define h_addr to
1525 be its first element. */
1526 host_info
.h_addr_list
= &(addr_list
[0]);
1528 host_info
.h_addr
= (char*)(&numeric_addr
);
1530 host_info
.h_length
= strlen (addr_list
[0]);
1533 bzero (&address
, sizeof address
);
1534 bcopy (host_info_ptr
->h_addr
, (char *) &address
.sin_addr
,
1535 host_info_ptr
->h_length
);
1536 address
.sin_family
= host_info_ptr
->h_addrtype
;
1537 address
.sin_port
= port
;
1539 s
= socket (host_info_ptr
->h_addrtype
, SOCK_STREAM
, 0);
1541 report_file_error ("error creating socket", Fcons (name
, Qnil
));
1543 /* Kernel bugs (on Ultrix at least) cause lossage (not just EINTR)
1544 when connect is interrupted. So let's not let it get interrupted.
1545 Note we do not turn off polling, because polling is only used
1546 when not interrupt_input, and thus not normally used on the systems
1547 which have this bug. On systems which use polling, there's no way
1548 to quit if polling is turned off. */
1549 if (interrupt_input
)
1552 /* Slow down polling to every ten seconds.
1553 Some kernels have a bug which causes retrying connect to fail
1555 #ifdef POLL_FOR_INPUT
1556 bind_polling_period (10);
1560 if (connect (s
, (struct sockaddr
*) &address
, sizeof address
) == -1
1561 && errno
!= EISCONN
)
1567 if (errno
== EADDRINUSE
&& retry
< 20)
1575 if (interrupt_input
)
1579 report_file_error ("connection failed",
1580 Fcons (host
, Fcons (name
, Qnil
)));
1583 #ifdef POLL_FOR_INPUT
1584 unbind_to (count
, Qnil
);
1587 if (interrupt_input
)
1591 s
= connect_server (0);
1593 report_file_error ("error creating socket", Fcons (name
, Qnil
));
1594 send_command (s
, C_PORT
, 0, "%s:%d", XSTRING (host
)->data
, ntohs (port
));
1595 send_command (s
, C_DUMB
, 1, 0);
1601 report_file_error ("error duplicating socket", Fcons (name
, Qnil
));
1604 buffer
= Fget_buffer_create (buffer
);
1605 proc
= make_process (name
);
1607 chan_process
[inch
] = proc
;
1610 fcntl (inch
, F_SETFL
, O_NONBLOCK
);
1613 fcntl (inch
, F_SETFL
, O_NDELAY
);
1617 XPROCESS (proc
)->childp
= host
;
1618 XPROCESS (proc
)->command_channel_p
= Qnil
;
1619 XPROCESS (proc
)->buffer
= buffer
;
1620 XPROCESS (proc
)->sentinel
= Qnil
;
1621 XPROCESS (proc
)->filter
= Qnil
;
1622 XPROCESS (proc
)->command
= Qnil
;
1623 XPROCESS (proc
)->pid
= Qnil
;
1624 XSET (XPROCESS (proc
)->infd
, Lisp_Int
, s
);
1625 XSET (XPROCESS (proc
)->outfd
, Lisp_Int
, outch
);
1626 XPROCESS (proc
)->status
= Qrun
;
1627 FD_SET (inch
, &input_wait_mask
);
1628 if (inch
> max_process_desc
)
1629 max_process_desc
= inch
;
1634 #endif /* HAVE_SOCKETS */
1636 deactivate_process (proc
)
1639 register int inchannel
, outchannel
;
1640 register struct Lisp_Process
*p
= XPROCESS (proc
);
1642 inchannel
= XINT (p
->infd
);
1643 outchannel
= XINT (p
->outfd
);
1647 /* Beware SIGCHLD hereabouts. */
1648 flush_pending_output (inchannel
);
1651 VMS_PROC_STUFF
*get_vms_process_pointer (), *vs
;
1652 sys$
dassgn (outchannel
);
1653 vs
= get_vms_process_pointer (p
->pid
);
1655 give_back_vms_process_stuff (vs
);
1659 if (outchannel
>= 0 && outchannel
!= inchannel
)
1663 XSET (p
->infd
, Lisp_Int
, -1);
1664 XSET (p
->outfd
, Lisp_Int
, -1);
1665 chan_process
[inchannel
] = Qnil
;
1666 FD_CLR (inchannel
, &input_wait_mask
);
1667 if (inchannel
== max_process_desc
)
1670 /* We just closed the highest-numbered process input descriptor,
1671 so recompute the highest-numbered one now. */
1672 max_process_desc
= 0;
1673 for (i
= 0; i
< MAXDESC
; i
++)
1674 if (!NILP (chan_process
[i
]))
1675 max_process_desc
= i
;
1680 /* Close all descriptors currently in use for communication
1681 with subprocess. This is used in a newly-forked subprocess
1682 to get rid of irrelevant descriptors. */
1684 close_process_descs ()
1687 for (i
= 0; i
< MAXDESC
; i
++)
1689 Lisp_Object process
;
1690 process
= chan_process
[i
];
1691 if (!NILP (process
))
1693 int in
= XINT (XPROCESS (process
)->infd
);
1694 int out
= XINT (XPROCESS (process
)->outfd
);
1697 if (out
>= 0 && in
!= out
)
1703 DEFUN ("accept-process-output", Faccept_process_output
, Saccept_process_output
,
1705 "Allow any pending output from subprocesses to be read by Emacs.\n\
1706 It is read into the process' buffers or given to their filter functions.\n\
1707 Non-nil arg PROCESS means do not return until some output has been received\n\
1709 Non-nil second arg TIMEOUT and third arg TIMEOUT-MSECS are number of\n\
1710 seconds and microseconds to wait; return after that much time whether\n\
1711 or not there is input.\n\
1712 Return non-nil iff we received any output before the timeout expired.")
1713 (proc
, timeout
, timeout_msecs
)
1714 register Lisp_Object proc
, timeout
, timeout_msecs
;
1719 if (! NILP (timeout_msecs
))
1721 CHECK_NUMBER (timeout_msecs
, 2);
1722 useconds
= XINT (timeout_msecs
);
1723 if (XTYPE (timeout
) != Lisp_Int
)
1724 XSET (timeout
, Lisp_Int
, 0);
1727 int carry
= useconds
/ 1000000;
1729 XSETINT (timeout
, XINT (timeout
) + carry
);
1730 useconds
-= carry
* 1000000;
1732 /* I think this clause is necessary because C doesn't
1733 guarantee a particular rounding direction for negative
1737 XSETINT (timeout
, XINT (timeout
) - 1);
1738 useconds
+= 1000000;
1745 if (! NILP (timeout
))
1747 CHECK_NUMBER (timeout
, 1);
1748 seconds
= XINT (timeout
);
1761 XFASTINT (proc
) = 0;
1764 (wait_reading_process_input (seconds
, useconds
, proc
, 0)
1768 /* This variable is different from waiting_for_input in keyboard.c.
1769 It is used to communicate to a lisp process-filter/sentinel (via the
1770 function Fwaiting_for_user_input_p below) whether emacs was waiting
1771 for user-input when that process-filter was called.
1772 waiting_for_input cannot be used as that is by definition 0 when
1773 lisp code is being evalled */
1774 static int waiting_for_user_input_p
;
1776 /* Read and dispose of subprocess output while waiting for timeout to
1777 elapse and/or keyboard input to be available.
1780 timeout in seconds, or
1781 zero for no limit, or
1782 -1 means gobble data immediately available but don't wait for any.
1785 an additional duration to wait, measured in microseconds.
1786 If this is nonzero and time_limit is 0, then the timeout
1787 consists of MICROSECS only.
1789 READ_KBD is a lisp value:
1790 0 to ignore keyboard input, or
1791 1 to return when input is available, or
1792 -1 meaning caller will actually read the input, so don't throw to
1793 the quit handler, or
1794 a cons cell, meaning wait until its car is non-nil
1795 (and gobble terminal input into the buffer if any arrives), or
1796 a process object, meaning wait until something arrives from that
1797 process. The return value is true iff we read some input from
1800 DO_DISPLAY != 0 means redisplay should be done to show subprocess
1801 output that arrives.
1803 If READ_KBD is a pointer to a struct Lisp_Process, then the
1804 function returns true iff we received input from that process
1805 before the timeout elapsed.
1806 Otherwise, return true iff we received input from any process. */
1808 wait_reading_process_input (time_limit
, microsecs
, read_kbd
, do_display
)
1809 int time_limit
, microsecs
;
1810 Lisp_Object read_kbd
;
1813 register int channel
, nfds
, m
;
1814 static SELECT_TYPE Available
;
1817 EMACS_TIME timeout
, end_time
, garbage
;
1819 int wait_channel
= -1;
1820 struct Lisp_Process
*wait_proc
= 0;
1821 int got_some_input
= 0;
1822 Lisp_Object
*wait_for_cell
= 0;
1824 FD_ZERO (&Available
);
1826 /* If read_kbd is a process to watch, set wait_proc and wait_channel
1828 if (XTYPE (read_kbd
) == Lisp_Process
)
1830 wait_proc
= XPROCESS (read_kbd
);
1831 wait_channel
= XINT (wait_proc
->infd
);
1832 XFASTINT (read_kbd
) = 0;
1835 /* If waiting for non-nil in a cell, record where. */
1836 if (XTYPE (read_kbd
) == Lisp_Cons
)
1838 wait_for_cell
= &XCONS (read_kbd
)->car
;
1839 XFASTINT (read_kbd
) = 0;
1842 waiting_for_user_input_p
= XINT (read_kbd
);
1844 /* Since we may need to wait several times,
1845 compute the absolute time to return at. */
1846 if (time_limit
|| microsecs
)
1848 EMACS_GET_TIME (end_time
);
1849 EMACS_SET_SECS_USECS (timeout
, time_limit
, microsecs
);
1850 EMACS_ADD_TIME (end_time
, end_time
, timeout
);
1853 /* It would not be safe to call this below,
1854 where we call redisplay_preserve_echo_area. */
1855 if (do_display
&& frame_garbaged
)
1856 prepare_menu_bars ();
1860 /* If calling from keyboard input, do not quit
1861 since we want to return C-g as an input character.
1862 Otherwise, do pending quit if requested. */
1863 if (XINT (read_kbd
) >= 0)
1866 /* Exit now if the cell we're waiting for became non-nil. */
1867 if (wait_for_cell
&& ! NILP (*wait_for_cell
))
1870 /* Compute time from now till when time limit is up */
1871 /* Exit if already run out */
1872 if (time_limit
== -1)
1874 /* -1 specified for timeout means
1875 gobble output available now
1876 but don't wait at all. */
1878 EMACS_SET_SECS_USECS (timeout
, 0, 0);
1880 else if (time_limit
|| microsecs
)
1882 EMACS_GET_TIME (timeout
);
1883 EMACS_SUB_TIME (timeout
, end_time
, timeout
);
1884 if (EMACS_TIME_NEG_P (timeout
))
1889 EMACS_SET_SECS_USECS (timeout
, 100000, 0);
1892 /* Cause C-g and alarm signals to take immediate action,
1893 and cause input available signals to zero out timeout.
1895 It is important that we do this before checking for process
1896 activity. If we get a SIGCHLD after the explicit checks for
1897 process activity, timeout is the only way we will know. */
1898 if (XINT (read_kbd
) < 0)
1899 set_waiting_for_input (&timeout
);
1901 /* If status of something has changed, and no input is
1902 available, notify the user of the change right away. After
1903 this explicit check, we'll let the SIGCHLD handler zap
1904 timeout to get our attention. */
1905 if (update_tick
!= process_tick
&& do_display
)
1907 Atemp
= input_wait_mask
;
1908 EMACS_SET_SECS_USECS (timeout
, 0, 0);
1909 if (select (MAXDESC
, &Atemp
, 0, 0, &timeout
) <= 0)
1911 /* It's okay for us to do this and then continue with
1912 the loop, since timeout has already been zeroed out. */
1913 clear_waiting_for_input ();
1918 /* Don't wait for output from a non-running process. */
1919 if (wait_proc
!= 0 && !NILP (wait_proc
->raw_status_low
))
1920 update_status (wait_proc
);
1922 && ! EQ (wait_proc
->status
, Qrun
))
1924 clear_waiting_for_input ();
1928 /* Wait till there is something to do */
1930 Available
= input_wait_mask
;
1931 /* We used to have && wait_for_cell == 0
1932 but that led to lossage handling selection_request events:
1933 within one, we would start to handle another. */
1934 if (! XINT (read_kbd
))
1935 FD_CLR (keyboard_descriptor
, &Available
);
1937 /* If frame size has changed or the window is newly mapped,
1938 redisplay now, before we start to wait. There is a race
1939 condition here; if a SIGIO arrives between now and the select
1940 and indicates that a frame is trashed, the select may block
1941 displaying a trashed screen. */
1942 if (frame_garbaged
&& do_display
)
1943 redisplay_preserve_echo_area ();
1945 if (XINT (read_kbd
) && detect_input_pending ())
1948 FD_ZERO (&Available
);
1951 nfds
= select (MAXDESC
, &Available
, 0, 0, &timeout
);
1955 /* Make C-g and alarm signals set flags again */
1956 clear_waiting_for_input ();
1958 /* If we woke up due to SIGWINCH, actually change size now. */
1959 do_pending_window_change ();
1961 if (time_limit
&& nfds
== 0) /* timeout elapsed */
1965 if (xerrno
== EINTR
)
1966 FD_ZERO (&Available
);
1968 /* Ultrix select seems to return ENOMEM when it is
1969 interrupted. Treat it just like EINTR. Bleah. Note
1970 that we want to test for the "ultrix" CPP symbol, not
1971 "__ultrix__"; the latter is only defined under GCC, but
1972 not by DEC's bundled CC. -JimB */
1973 else if (xerrno
== ENOMEM
)
1974 FD_ZERO (&Available
);
1977 /* This happens for no known reason on ALLIANT.
1978 I am guessing that this is the right response. -- RMS. */
1979 else if (xerrno
== EFAULT
)
1980 FD_ZERO (&Available
);
1982 else if (xerrno
== EBADF
)
1985 /* AIX doesn't handle PTY closure the same way BSD does. On AIX,
1986 the child's closure of the pts gives the parent a SIGHUP, and
1987 the ptc file descriptor is automatically closed,
1988 yielding EBADF here or at select() call above.
1989 So, SIGHUP is ignored (see def of PTY_TTY_NAME_SPRINTF
1990 in m/ibmrt-aix.h), and here we just ignore the select error.
1991 Cleanup occurs c/o status_notify after SIGCLD. */
1992 FD_ZERO (&Available
); /* Cannot depend on values returned */
1998 error("select error: %s", strerror (xerrno
));
2000 #if defined(sun) && !defined(USG5_4)
2001 else if (nfds
> 0 && FD_ISSET (keyboard_descriptor
, &Available
)
2003 /* System sometimes fails to deliver SIGIO.
2005 David J. Mackenzie says that Emacs doesn't compile under
2006 Solaris if this code is enabled, thus the USG5_4 in the CPP
2007 conditional. "I haven't noticed any ill effects so far.
2008 If you find a Solaris expert somewhere, they might know
2010 kill (getpid (), SIGIO
);
2013 /* Check for keyboard input */
2014 /* If there is any, return immediately
2015 to give it higher priority than subprocesses */
2017 /* We used to do this if wait_for_cell,
2018 but that caused infinite recursion in selection request events. */
2019 if ((XINT (read_kbd
))
2020 && detect_input_pending ())
2023 if (detect_input_pending ())
2027 /* Exit now if the cell we're waiting for became non-nil. */
2028 if (wait_for_cell
&& ! NILP (*wait_for_cell
))
2032 /* If we think we have keyboard input waiting, but didn't get SIGIO
2033 go read it. This can happen with X on BSD after logging out.
2034 In that case, there really is no input and no SIGIO,
2035 but select says there is input. */
2037 if (XINT (read_kbd
) && interrupt_input
2038 && (FD_ISSET (keyboard_descriptor
, &Available
)))
2043 got_some_input
|= nfds
> 0;
2045 /* If checking input just got us a size-change event from X,
2046 obey it now if we should. */
2047 if (XINT (read_kbd
) || wait_for_cell
)
2048 do_pending_window_change ();
2050 /* Check for data from a process. */
2051 /* Really FIRST_PROC_DESC should be 0 on Unix,
2052 but this is safer in the short run. */
2053 for (channel
= keyboard_descriptor
== 0 ? FIRST_PROC_DESC
: 0;
2054 channel
<= max_process_desc
; channel
++)
2056 if (FD_ISSET (channel
, &Available
))
2060 /* If waiting for this channel, arrange to return as
2061 soon as no more input to be processed. No more
2063 if (wait_channel
== channel
)
2069 proc
= chan_process
[channel
];
2073 /* Read data from the process, starting with our
2074 buffered-ahead character if we have one. */
2076 nread
= read_process_output (proc
, channel
);
2079 /* Since read_process_output can run a filter,
2080 which can call accept-process-output,
2081 don't try to read from any other processes
2082 before doing the select again. */
2083 FD_ZERO (&Available
);
2086 redisplay_preserve_echo_area ();
2089 else if (nread
== -1 && errno
== EWOULDBLOCK
)
2093 else if (nread
== -1 && errno
== EAGAIN
)
2097 else if (nread
== -1 && errno
== EAGAIN
)
2099 /* Note that we cannot distinguish between no input
2100 available now and a closed pipe.
2101 With luck, a closed pipe will be accompanied by
2102 subprocess termination and SIGCHLD. */
2103 else if (nread
== 0 && !NETCONN_P (proc
))
2105 #endif /* O_NDELAY */
2106 #endif /* O_NONBLOCK */
2107 #endif /* EWOULDBLOCK */
2109 /* On some OSs with ptys, when the process on one end of
2110 a pty exits, the other end gets an error reading with
2111 errno = EIO instead of getting an EOF (0 bytes read).
2112 Therefore, if we get an error reading and errno =
2113 EIO, just continue, because the child process has
2114 exited and should clean itself up soon (e.g. when we
2116 else if (nread
== -1 && errno
== EIO
)
2118 #endif /* HAVE_PTYS */
2119 /* If we can detect process termination, don't consider the process
2120 gone just because its pipe is closed. */
2122 else if (nread
== 0 && !NETCONN_P (proc
))
2127 /* Preserve status of processes already terminated. */
2128 XSETINT (XPROCESS (proc
)->tick
, ++process_tick
);
2129 deactivate_process (proc
);
2130 if (!NILP (XPROCESS (proc
)->raw_status_low
))
2131 update_status (XPROCESS (proc
));
2132 if (EQ (XPROCESS (proc
)->status
, Qrun
))
2133 XPROCESS (proc
)->status
2134 = Fcons (Qexit
, Fcons (make_number (256), Qnil
));
2137 } /* end for each file descriptor */
2138 } /* end while exit conditions not met */
2140 /* If calling from keyboard input, do not quit
2141 since we want to return C-g as an input character.
2142 Otherwise, do pending quit if requested. */
2143 if (XINT (read_kbd
) >= 0)
2145 /* Prevent input_pending from remaining set if we quit. */
2146 clear_input_pending ();
2150 return got_some_input
;
2153 /* Read pending output from the process channel,
2154 starting with our buffered-ahead character if we have one.
2155 Yield number of characters read.
2157 This function reads at most 1024 characters.
2158 If you want to read all available subprocess output,
2159 you must call it repeatedly until it returns zero. */
2161 read_process_output (proc
, channel
)
2163 register int channel
;
2165 register int nchars
;
2171 register Lisp_Object outstream
;
2172 register struct buffer
*old
= current_buffer
;
2173 register struct Lisp_Process
*p
= XPROCESS (proc
);
2174 register int opoint
;
2177 VMS_PROC_STUFF
*vs
, *get_vms_process_pointer();
2179 vs
= get_vms_process_pointer (p
->pid
);
2183 return(0); /* Really weird if it does this */
2184 if (!(vs
->iosb
[0] & 1))
2185 return -1; /* I/O error */
2188 error ("Could not get VMS process pointer");
2189 chars
= vs
->inputBuffer
;
2190 nchars
= clean_vms_buffer (chars
, vs
->iosb
[1]);
2193 start_vms_process_read (vs
); /* Crank up the next read on the process */
2194 return 1; /* Nothing worth printing, say we got 1 */
2198 if (proc_buffered_char
[channel
] < 0)
2199 nchars
= read (channel
, chars
, sizeof chars
);
2202 chars
[0] = proc_buffered_char
[channel
];
2203 proc_buffered_char
[channel
] = -1;
2204 nchars
= read (channel
, chars
+ 1, sizeof chars
- 1);
2208 nchars
= nchars
+ 1;
2210 #endif /* not VMS */
2212 if (nchars
<= 0) return nchars
;
2214 outstream
= p
->filter
;
2215 if (!NILP (outstream
))
2217 /* We inhibit quit here instead of just catching it so that
2218 hitting ^G when a filter happens to be running won't screw
2220 int count
= specpdl_ptr
- specpdl
;
2221 Lisp_Object odeactivate
;
2222 Lisp_Object obuffer
;
2224 odeactivate
= Vdeactivate_mark
;
2225 obuffer
= Fcurrent_buffer ();
2227 specbind (Qinhibit_quit
, Qt
);
2228 call2 (outstream
, proc
, make_string (chars
, nchars
));
2230 /* Handling the process output should not deactivate the mark. */
2231 Vdeactivate_mark
= odeactivate
;
2233 if (! EQ (Fcurrent_buffer (), obuffer
))
2234 record_asynch_buffer_change ();
2236 if (waiting_for_user_input_p
)
2237 prepare_menu_bars ();
2240 start_vms_process_read (vs
);
2242 unbind_to (count
, Qnil
);
2246 /* If no filter, write into buffer if it isn't dead. */
2247 if (!NILP (p
->buffer
) && !NILP (XBUFFER (p
->buffer
)->name
))
2249 Lisp_Object old_read_only
;
2250 Lisp_Object old_begv
, old_zv
;
2251 Lisp_Object odeactivate
;
2253 odeactivate
= Vdeactivate_mark
;
2255 Fset_buffer (p
->buffer
);
2257 old_read_only
= current_buffer
->read_only
;
2258 XFASTINT (old_begv
) = BEGV
;
2259 XFASTINT (old_zv
) = ZV
;
2261 current_buffer
->read_only
= Qnil
;
2263 /* Insert new output into buffer
2264 at the current end-of-output marker,
2265 thus preserving logical ordering of input and output. */
2266 if (XMARKER (p
->mark
)->buffer
)
2267 SET_PT (clip_to_bounds (BEGV
, marker_position (p
->mark
), ZV
));
2271 /* If the output marker is outside of the visible region, save
2272 the restriction and widen. */
2273 if (! (BEGV
<= point
&& point
<= ZV
))
2276 /* Make sure opoint floats ahead of any new text, just as point
2278 if (point
<= opoint
)
2281 /* Insert after old_begv, but before old_zv. */
2282 if (point
< XFASTINT (old_begv
))
2283 XFASTINT (old_begv
) += nchars
;
2284 if (point
<= XFASTINT (old_zv
))
2285 XFASTINT (old_zv
) += nchars
;
2287 /* Insert before markers in case we are inserting where
2288 the buffer's mark is, and the user's next command is Meta-y. */
2289 insert_before_markers (chars
, nchars
);
2290 Fset_marker (p
->mark
, make_number (point
), p
->buffer
);
2292 update_mode_lines
++;
2294 /* If the restriction isn't what it should be, set it. */
2295 if (XFASTINT (old_begv
) != BEGV
|| XFASTINT (old_zv
) != ZV
)
2296 Fnarrow_to_region (old_begv
, old_zv
);
2298 /* Handling the process output should not deactivate the mark. */
2299 Vdeactivate_mark
= odeactivate
;
2301 current_buffer
->read_only
= old_read_only
;
2303 set_buffer_internal (old
);
2306 start_vms_process_read (vs
);
2311 DEFUN ("waiting-for-user-input-p", Fwaiting_for_user_input_p
, Swaiting_for_user_input_p
,
2313 "Returns non-nil if emacs is waiting for input from the user.\n\
2314 This is intended for use by asynchronous process output filters and sentinels.")
2317 return (waiting_for_user_input_p
? Qt
: Qnil
);
2320 /* Sending data to subprocess */
2322 jmp_buf send_process_frame
;
2325 send_process_trap ()
2331 longjmp (send_process_frame
, 1);
2334 send_process (proc
, buf
, len
)
2339 /* Don't use register vars; longjmp can lose them. */
2341 unsigned char *procname
= XSTRING (XPROCESS (proc
)->name
)->data
;
2345 struct Lisp_Process
*p
= XPROCESS (proc
);
2346 VMS_PROC_STUFF
*vs
, *get_vms_process_pointer();
2349 if (! NILP (XPROCESS (proc
)->raw_status_low
))
2350 update_status (XPROCESS (proc
));
2351 if (! EQ (XPROCESS (proc
)->status
, Qrun
))
2352 error ("Process %s not running", procname
);
2355 vs
= get_vms_process_pointer (p
->pid
);
2357 error ("Could not find this process: %x", p
->pid
);
2358 else if (write_to_vms_process (vs
, buf
, len
))
2361 if (!setjmp (send_process_frame
))
2365 SIGTYPE (*old_sigpipe
)();
2368 if (pty_max_bytes
== 0)
2370 #if defined (HAVE_FPATHCONF) && defined (_PC_MAX_CANON)
2371 pty_max_bytes
= fpathconf (XFASTINT (XPROCESS (proc
)->outfd
),
2373 if (pty_max_bytes
< 0)
2374 pty_max_bytes
= 250;
2376 pty_max_bytes
= 250;
2380 /* Don't send more than pty_max_bytes bytes at a time. */
2381 /* Subtract 1 to leave room for the EOF. */
2382 if (this >= pty_max_bytes
&& !NILP (XPROCESS (proc
)->pty_flag
))
2383 this = pty_max_bytes
- 1;
2385 old_sigpipe
= (SIGTYPE (*) ()) signal (SIGPIPE
, send_process_trap
);
2386 rv
= write (XINT (XPROCESS (proc
)->outfd
), buf
, this);
2388 /* If we sent just part of the string, put in an EOF
2389 to force it through, before we send the rest. */
2391 Fprocess_send_eof (proc
);
2393 signal (SIGPIPE
, old_sigpipe
);
2398 || errno
== EWOULDBLOCK
2405 /* It would be nice to accept process output here,
2406 but that is difficult. For example, it could
2407 garbage what we are sending if that is from a buffer. */
2414 report_file_error ("writing to process", Fcons (proc
, Qnil
));
2418 /* Allow input from processes between bursts of sending.
2419 Otherwise things may get stopped up. */
2424 XFASTINT (zero
) = 0;
2425 wait_reading_process_input (-1, 0, zero
, 0);
2431 XPROCESS (proc
)->raw_status_low
= Qnil
;
2432 XPROCESS (proc
)->raw_status_high
= Qnil
;
2433 XPROCESS (proc
)->status
= Fcons (Qexit
, Fcons (make_number (256), Qnil
));
2434 XSETINT (XPROCESS (proc
)->tick
, ++process_tick
);
2435 deactivate_process (proc
);
2437 error ("Error writing to process %s; closed it", procname
);
2439 error ("SIGPIPE raised on process %s; closed it", procname
);
2444 DEFUN ("process-send-region", Fprocess_send_region
, Sprocess_send_region
,
2446 "Send current contents of region as input to PROCESS.\n\
2447 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
2448 nil, indicating the current buffer's process.\n\
2449 Called from program, takes three arguments, PROCESS, START and END.\n\
2450 If the region is more than 500 characters long,\n\
2451 it is sent in several bunches. This may happen even for shorter regions.\n\
2452 Output from processes can arrive in between bunches.")
2453 (process
, start
, end
)
2454 Lisp_Object process
, start
, end
;
2459 proc
= get_process (process
);
2460 validate_region (&start
, &end
);
2462 if (XINT (start
) < GPT
&& XINT (end
) > GPT
)
2465 start1
= XINT (start
);
2466 send_process (proc
, &FETCH_CHAR (start1
), XINT (end
) - XINT (start
));
2471 DEFUN ("process-send-string", Fprocess_send_string
, Sprocess_send_string
,
2473 "Send PROCESS the contents of STRING as input.\n\
2474 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
2475 nil, indicating the current buffer's process.\n\
2476 If STRING is more than 500 characters long,\n\
2477 it is sent in several bunches. This may happen even for shorter strings.\n\
2478 Output from processes can arrive in between bunches.")
2480 Lisp_Object process
, string
;
2483 CHECK_STRING (string
, 1);
2484 proc
= get_process (process
);
2485 send_process (proc
, XSTRING (string
)->data
, XSTRING (string
)->size
);
2489 /* send a signal number SIGNO to PROCESS.
2490 CURRENT_GROUP means send to the process group that currently owns
2491 the terminal being used to communicate with PROCESS.
2492 This is used for various commands in shell mode.
2493 If NOMSG is zero, insert signal-announcements into process's buffers
2496 If we can, we try to signal PROCESS by sending control characters
2497 down the pty. This allows us to signal inferiors who have changed
2498 their uid, for which killpg would return an EPERM error. */
2501 process_send_signal (process
, signo
, current_group
, nomsg
)
2502 Lisp_Object process
;
2504 Lisp_Object current_group
;
2508 register struct Lisp_Process
*p
;
2512 proc
= get_process (process
);
2513 p
= XPROCESS (proc
);
2515 if (!EQ (p
->childp
, Qt
))
2516 error ("Process %s is not a subprocess",
2517 XSTRING (p
->name
)->data
);
2518 if (XINT (p
->infd
) < 0)
2519 error ("Process %s is not active",
2520 XSTRING (p
->name
)->data
);
2522 if (NILP (p
->pty_flag
))
2523 current_group
= Qnil
;
2525 /* If we are using pgrps, get a pgrp number and make it negative. */
2526 if (!NILP (current_group
))
2528 #ifdef SIGNALS_VIA_CHARACTERS
2529 /* If possible, send signals to the entire pgrp
2530 by sending an input character to it. */
2532 /* TERMIOS is the latest and bestest, and seems most likely to
2533 work. If the system has it, use it. */
2540 tcgetattr (XINT (p
->infd
), &t
);
2541 send_process (proc
, &t
.c_cc
[VINTR
], 1);
2545 tcgetattr (XINT (p
->infd
), &t
);
2546 send_process (proc
, &t
.c_cc
[VQUIT
], 1);
2550 tcgetattr (XINT (p
->infd
), &t
);
2551 #if defined (VSWTCH) && !defined (PREFER_VSUSP)
2552 send_process (proc
, &t
.c_cc
[VSWTCH
], 1);
2554 send_process (proc
, &t
.c_cc
[VSUSP
], 1);
2559 #else /* ! HAVE_TERMIOS */
2561 /* On Berkeley descendants, the following IOCTL's retrieve the
2562 current control characters. */
2563 #if defined (TIOCGLTC) && defined (TIOCGETC)
2571 ioctl (XINT (p
->infd
), TIOCGETC
, &c
);
2572 send_process (proc
, &c
.t_intrc
, 1);
2575 ioctl (XINT (p
->infd
), TIOCGETC
, &c
);
2576 send_process (proc
, &c
.t_quitc
, 1);
2580 ioctl (XINT (p
->infd
), TIOCGLTC
, &lc
);
2581 send_process (proc
, &lc
.t_suspc
, 1);
2583 #endif /* ! defined (SIGTSTP) */
2586 #else /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
2588 /* On SYSV descendants, the TCGETA ioctl retrieves the current control
2595 ioctl (XINT (p
->infd
), TCGETA
, &t
);
2596 send_process (proc
, &t
.c_cc
[VINTR
], 1);
2599 ioctl (XINT (p
->infd
), TCGETA
, &t
);
2600 send_process (proc
, &t
.c_cc
[VQUIT
], 1);
2604 ioctl (XINT (p
->infd
), TCGETA
, &t
);
2605 send_process (proc
, &t
.c_cc
[VSWTCH
], 1);
2607 #endif /* ! defined (SIGTSTP) */
2609 #else /* ! defined (TCGETA) */
2610 Your configuration files are messed up
.
2611 /* If your system configuration files define SIGNALS_VIA_CHARACTERS,
2612 you'd better be using one of the alternatives above! */
2613 #endif /* ! defined (TCGETA) */
2614 #endif /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
2615 #endif /* ! defined HAVE_TERMIOS */
2616 #endif /* ! defined (SIGNALS_VIA_CHARACTERS) */
2619 /* Get the pgrp using the tty itself, if we have that.
2620 Otherwise, use the pty to get the pgrp.
2621 On pfa systems, saka@pfu.fujitsu.co.JP writes:
2622 "TIOCGPGRP symbol defined in sys/ioctl.h at E50.
2623 But, TIOCGPGRP does not work on E50 ;-P works fine on E60"
2624 His patch indicates that if TIOCGPGRP returns an error, then
2625 we should just assume that p->pid is also the process group id. */
2629 if (!NILP (p
->subtty
))
2630 err
= ioctl (XFASTINT (p
->subtty
), TIOCGPGRP
, &gid
);
2632 err
= ioctl (XINT (p
->infd
), TIOCGPGRP
, &gid
);
2636 gid
= - XFASTINT (p
->pid
);
2637 #endif /* ! defined (pfa) */
2643 #else /* ! defined (TIOCGPGRP ) */
2644 /* Can't select pgrps on this system, so we know that
2645 the child itself heads the pgrp. */
2646 gid
= - XFASTINT (p
->pid
);
2647 #endif /* ! defined (TIOCGPGRP ) */
2650 gid
= - XFASTINT (p
->pid
);
2656 p
->raw_status_low
= Qnil
;
2657 p
->raw_status_high
= Qnil
;
2659 XSETINT (p
->tick
, ++process_tick
);
2663 #endif /* ! defined (SIGCONT) */
2666 send_process (proc
, "\003", 1); /* ^C */
2671 send_process (proc
, "\031", 1); /* ^Y */
2676 sys$
forcex (&(XFASTINT (p
->pid
)), 0, 1);
2679 flush_pending_output (XINT (p
->infd
));
2683 /* If we don't have process groups, send the signal to the immediate
2684 subprocess. That isn't really right, but it's better than any
2685 obvious alternative. */
2688 kill (XFASTINT (p
->pid
), signo
);
2692 /* gid may be a pid, or minus a pgrp's number */
2694 if (!NILP (current_group
))
2695 ioctl (XINT (p
->infd
), TIOCSIGSEND
, signo
);
2698 gid
= - XFASTINT (p
->pid
);
2701 #else /* ! defined (TIOCSIGSEND) */
2702 EMACS_KILLPG (-gid
, signo
);
2703 #endif /* ! defined (TIOCSIGSEND) */
2706 DEFUN ("interrupt-process", Finterrupt_process
, Sinterrupt_process
, 0, 2, 0,
2707 "Interrupt process PROCESS. May be process or name of one.\n\
2708 PROCESS may be a process, a buffer, or the name of a process or buffer.\n\
2709 nil or no arg means current buffer's process.\n\
2710 Second arg CURRENT-GROUP non-nil means send signal to\n\
2711 the current process-group of the process's controlling terminal\n\
2712 rather than to the process's own process group.\n\
2713 If the process is a shell, this means interrupt current subjob\n\
2714 rather than the shell.")
2715 (process
, current_group
)
2716 Lisp_Object process
, current_group
;
2718 process_send_signal (process
, SIGINT
, current_group
, 0);
2722 DEFUN ("kill-process", Fkill_process
, Skill_process
, 0, 2, 0,
2723 "Kill process PROCESS. May be process or name of one.\n\
2724 See function `interrupt-process' for more details on usage.")
2725 (process
, current_group
)
2726 Lisp_Object process
, current_group
;
2728 process_send_signal (process
, SIGKILL
, current_group
, 0);
2732 DEFUN ("quit-process", Fquit_process
, Squit_process
, 0, 2, 0,
2733 "Send QUIT signal to process PROCESS. May be process or name of one.\n\
2734 See function `interrupt-process' for more details on usage.")
2735 (process
, current_group
)
2736 Lisp_Object process
, current_group
;
2738 process_send_signal (process
, SIGQUIT
, current_group
, 0);
2742 DEFUN ("stop-process", Fstop_process
, Sstop_process
, 0, 2, 0,
2743 "Stop process PROCESS. May be process or name of one.\n\
2744 See function `interrupt-process' for more details on usage.")
2745 (process
, current_group
)
2746 Lisp_Object process
, current_group
;
2749 error ("no SIGTSTP support");
2751 process_send_signal (process
, SIGTSTP
, current_group
, 0);
2756 DEFUN ("continue-process", Fcontinue_process
, Scontinue_process
, 0, 2, 0,
2757 "Continue process PROCESS. May be process or name of one.\n\
2758 See function `interrupt-process' for more details on usage.")
2759 (process
, current_group
)
2760 Lisp_Object process
, current_group
;
2763 process_send_signal (process
, SIGCONT
, current_group
, 0);
2765 error ("no SIGCONT support");
2770 DEFUN ("signal-process", Fsignal_process
, Ssignal_process
,
2771 2, 2, "nProcess number: \nnSignal code: ",
2772 "Send the process with number PID the signal with code CODE.\n\
2773 Both PID and CODE are integers.")
2775 Lisp_Object pid
, sig
;
2777 CHECK_NUMBER (pid
, 0);
2778 CHECK_NUMBER (sig
, 1);
2779 return make_number (kill (XINT (pid
), XINT (sig
)));
2782 DEFUN ("process-send-eof", Fprocess_send_eof
, Sprocess_send_eof
, 0, 1, 0,
2783 "Make PROCESS see end-of-file in its input.\n\
2784 Eof comes after any text already sent to it.\n\
2785 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
2786 nil, indicating the current buffer's process.\n\
2787 If PROCESS is a network connection, or is a process communicating\n\
2788 through a pipe (as opposed to a pty), then you cannot send any more\n\
2789 text to PROCESS after you call this function.")
2791 Lisp_Object process
;
2795 proc
= get_process (process
);
2797 /* Make sure the process is really alive. */
2798 if (! NILP (XPROCESS (proc
)->raw_status_low
))
2799 update_status (XPROCESS (proc
));
2800 if (! EQ (XPROCESS (proc
)->status
, Qrun
))
2801 error ("Process %s not running", XSTRING (XPROCESS (proc
)->name
)->data
);
2803 /* Sending a zero-length record is supposed to mean eof
2804 when TIOCREMOTE is turned on. */
2808 write (XINT (XPROCESS (proc
)->outfd
), buf
, 0);
2810 #else /* did not do TOICREMOTE */
2812 send_process (proc
, "\032", 1); /* ^z */
2814 if (!NILP (XPROCESS (proc
)->pty_flag
))
2815 send_process (proc
, "\004", 1);
2818 close (XINT (XPROCESS (proc
)->outfd
));
2819 XSET (XPROCESS (proc
)->outfd
, Lisp_Int
, open (NULL_DEVICE
, O_WRONLY
));
2822 #endif /* did not do TOICREMOTE */
2826 /* Kill all processes associated with `buffer'.
2827 If `buffer' is nil, kill all processes */
2829 kill_buffer_processes (buffer
)
2832 Lisp_Object tail
, proc
;
2834 for (tail
= Vprocess_alist
; XGCTYPE (tail
) == Lisp_Cons
;
2835 tail
= XCONS (tail
)->cdr
)
2837 proc
= XCONS (XCONS (tail
)->car
)->cdr
;
2838 if (XGCTYPE (proc
) == Lisp_Process
2839 && (NILP (buffer
) || EQ (XPROCESS (proc
)->buffer
, buffer
)))
2841 if (NETCONN_P (proc
))
2842 Fdelete_process (proc
);
2843 else if (XINT (XPROCESS (proc
)->infd
) >= 0)
2844 process_send_signal (proc
, SIGHUP
, Qnil
, 1);
2849 /* On receipt of a signal that a child status has changed,
2850 loop asking about children with changed statuses until
2851 the system says there are no more.
2852 All we do is change the status;
2853 we do not run sentinels or print notifications.
2854 That is saved for the next time keyboard input is done,
2855 in order to avoid timing errors. */
2857 /** WARNING: this can be called during garbage collection.
2858 Therefore, it must not be fooled by the presence of mark bits in
2861 /** USG WARNING: Although it is not obvious from the documentation
2862 in signal(2), on a USG system the SIGCLD handler MUST NOT call
2863 signal() before executing at least one wait(), otherwise the handler
2864 will be called again, resulting in an infinite loop. The relevant
2865 portion of the documentation reads "SIGCLD signals will be queued
2866 and the signal-catching function will be continually reentered until
2867 the queue is empty". Invoking signal() causes the kernel to reexamine
2868 the SIGCLD queue. Fred Fish, UniSoft Systems Inc. */
2871 sigchld_handler (signo
)
2874 int old_errno
= errno
;
2876 register struct Lisp_Process
*p
;
2877 extern EMACS_TIME
*input_available_clear_time
;
2881 sigheld
|= sigbit (SIGCHLD
);
2893 #endif /* no WUNTRACED */
2894 /* Keep trying to get a status until we get a definitive result. */
2898 pid
= wait3 (&w
, WNOHANG
| WUNTRACED
, 0);
2900 while (pid
<= 0 && errno
== EINTR
);
2904 /* A real failure. We have done all our job, so return. */
2906 /* USG systems forget handlers when they are used;
2907 must reestablish each time */
2909 signal (signo
, sigchld_handler
); /* WARNING - must come after wait3() */
2912 sigheld
&= ~sigbit (SIGCHLD
);
2920 #endif /* no WNOHANG */
2922 /* Find the process that signaled us, and record its status. */
2925 for (tail
= Vprocess_alist
; XSYMBOL (tail
) != XSYMBOL (Qnil
); tail
= XCONS (tail
)->cdr
)
2927 proc
= XCONS (XCONS (tail
)->car
)->cdr
;
2928 p
= XPROCESS (proc
);
2929 if (EQ (p
->childp
, Qt
) && XFASTINT (p
->pid
) == pid
)
2934 /* Look for an asynchronous process whose pid hasn't been filled
2937 for (tail
= Vprocess_alist
; XSYMBOL (tail
) != XSYMBOL (Qnil
); tail
= XCONS (tail
)->cdr
)
2939 proc
= XCONS (XCONS (tail
)->car
)->cdr
;
2940 p
= XPROCESS (proc
);
2941 if (XTYPE (p
->pid
) == Lisp_Int
&& XINT (p
->pid
) == -1)
2946 /* Change the status of the process that was found. */
2949 union { int i
; WAITTYPE wt
; } u
;
2951 XSETINT (p
->tick
, ++process_tick
);
2953 XFASTINT (p
->raw_status_low
) = u
.i
& 0xffff;
2954 XFASTINT (p
->raw_status_high
) = u
.i
>> 16;
2956 /* If process has terminated, stop waiting for its output. */
2957 if (WIFSIGNALED (w
) || WIFEXITED (w
))
2958 if (XINT (p
->infd
) >= 0)
2959 FD_CLR (XINT (p
->infd
), &input_wait_mask
);
2961 /* Tell wait_reading_process_input that it needs to wake up and
2963 if (input_available_clear_time
)
2964 EMACS_SET_SECS_USECS (*input_available_clear_time
, 0, 0);
2967 /* There was no asynchronous process found for that id. Check
2968 if we have a synchronous process. */
2971 synch_process_alive
= 0;
2973 /* Report the status of the synchronous process. */
2975 synch_process_retcode
= WRETCODE (w
);
2976 else if (WIFSIGNALED (w
))
2978 int code
= WTERMSIG (w
);
2984 signame
= sys_siglist
[code
];
2986 signame
= sys_errlist
[code
];
2990 signame
= "unknown";
2992 synch_process_death
= signame
;
2995 /* Tell wait_reading_process_input that it needs to wake up and
2997 if (input_available_clear_time
)
2998 EMACS_SET_SECS_USECS (*input_available_clear_time
, 0, 0);
3001 /* On some systems, we must return right away.
3002 If any more processes want to signal us, we will
3004 Otherwise (on systems that have WNOHANG), loop around
3005 to use up all the processes that have something to tell us. */
3006 #if defined (USG) && ! (defined (HPUX) && defined (WNOHANG))
3008 signal (signo
, sigchld_handler
);
3012 #endif /* USG, but not HPUX with WNOHANG */
3018 exec_sentinel_unwind (data
)
3021 XPROCESS (XCONS (data
)->car
)->sentinel
= XCONS (data
)->cdr
;
3026 exec_sentinel (proc
, reason
)
3027 Lisp_Object proc
, reason
;
3029 Lisp_Object sentinel
, obuffer
, odeactivate
;
3030 register struct Lisp_Process
*p
= XPROCESS (proc
);
3031 int count
= specpdl_ptr
- specpdl
;
3033 odeactivate
= Vdeactivate_mark
;
3034 obuffer
= Fcurrent_buffer ();
3035 sentinel
= p
->sentinel
;
3036 if (NILP (sentinel
))
3039 /* Zilch the sentinel while it's running, to avoid recursive invocations;
3040 assure that it gets restored no matter how the sentinel exits. */
3042 record_unwind_protect (exec_sentinel_unwind
, Fcons (proc
, sentinel
));
3043 /* Inhibit quit so that random quits don't screw up a running filter. */
3044 specbind (Qinhibit_quit
, Qt
);
3045 call2 (sentinel
, proc
, reason
);
3047 Vdeactivate_mark
= odeactivate
;
3048 if (! EQ (Fcurrent_buffer (), obuffer
))
3049 record_asynch_buffer_change ();
3051 if (waiting_for_user_input_p
)
3052 prepare_menu_bars ();
3053 unbind_to (count
, Qnil
);
3056 /* Report all recent events of a change in process status
3057 (either run the sentinel or output a message).
3058 This is done while Emacs is waiting for keyboard input. */
3062 register Lisp_Object proc
, buffer
;
3063 Lisp_Object tail
, msg
;
3064 struct gcpro gcpro1
, gcpro2
;
3068 /* We need to gcpro tail; if read_process_output calls a filter
3069 which deletes a process and removes the cons to which tail points
3070 from Vprocess_alist, and then causes a GC, tail is an unprotected
3074 for (tail
= Vprocess_alist
; !NILP (tail
); tail
= Fcdr (tail
))
3077 register struct Lisp_Process
*p
;
3079 proc
= Fcdr (Fcar (tail
));
3080 p
= XPROCESS (proc
);
3082 if (XINT (p
->tick
) != XINT (p
->update_tick
))
3084 XSETINT (p
->update_tick
, XINT (p
->tick
));
3086 /* If process is still active, read any output that remains. */
3087 if (XINT (p
->infd
) >= 0)
3088 while (! EQ (p
->filter
, Qt
)
3089 && read_process_output (proc
, XINT (p
->infd
)) > 0);
3093 /* Get the text to use for the message. */
3094 if (!NILP (p
->raw_status_low
))
3096 msg
= status_message (p
->status
);
3098 /* If process is terminated, deactivate it or delete it. */
3100 if (XTYPE (p
->status
) == Lisp_Cons
)
3101 symbol
= XCONS (p
->status
)->car
;
3103 if (EQ (symbol
, Qsignal
) || EQ (symbol
, Qexit
)
3104 || EQ (symbol
, Qclosed
))
3106 if (delete_exited_processes
)
3107 remove_process (proc
);
3109 deactivate_process (proc
);
3112 /* Now output the message suitably. */
3113 if (!NILP (p
->sentinel
))
3114 exec_sentinel (proc
, msg
);
3115 /* Don't bother with a message in the buffer
3116 when a process becomes runnable. */
3117 else if (!EQ (symbol
, Qrun
) && !NILP (buffer
))
3119 Lisp_Object ro
, tem
;
3120 struct buffer
*old
= current_buffer
;
3123 ro
= XBUFFER (buffer
)->read_only
;
3125 /* Avoid error if buffer is deleted
3126 (probably that's why the process is dead, too) */
3127 if (NILP (XBUFFER (buffer
)->name
))
3129 Fset_buffer (buffer
);
3131 /* Insert new output into buffer
3132 at the current end-of-output marker,
3133 thus preserving logical ordering of input and output. */
3134 if (XMARKER (p
->mark
)->buffer
)
3135 SET_PT (marker_position (p
->mark
));
3138 if (point
<= opoint
)
3139 opoint
+= XSTRING (msg
)->size
+ XSTRING (p
->name
)->size
+ 10;
3141 tem
= current_buffer
->read_only
;
3142 current_buffer
->read_only
= Qnil
;
3143 insert_string ("\nProcess ");
3144 Finsert (1, &p
->name
);
3145 insert_string (" ");
3147 current_buffer
->read_only
= tem
;
3148 Fset_marker (p
->mark
, make_number (point
), p
->buffer
);
3151 set_buffer_internal (old
);
3156 update_mode_lines
++; /* in case buffers use %s in mode-line-format */
3157 redisplay_preserve_echo_area ();
3159 update_tick
= process_tick
;
3170 if (! noninteractive
|| initialized
)
3172 signal (SIGCHLD
, sigchld_handler
);
3175 FD_ZERO (&input_wait_mask
);
3176 max_process_desc
= 0;
3178 keyboard_descriptor
= 0;
3179 FD_SET (keyboard_descriptor
, &input_wait_mask
);
3181 Vprocess_alist
= Qnil
;
3182 for (i
= 0; i
< MAXDESC
; i
++)
3184 chan_process
[i
] = Qnil
;
3185 proc_buffered_char
[i
] = -1;
3189 /* From now on, assume keyboard input comes from descriptor DESC. */
3192 change_keyboard_wait_descriptor (desc
)
3195 FD_CLR (keyboard_descriptor
, &input_wait_mask
);
3196 keyboard_descriptor
= desc
;
3197 FD_SET (keyboard_descriptor
, &input_wait_mask
);
3203 stream_process
= intern ("stream");
3205 Qprocessp
= intern ("processp");
3206 staticpro (&Qprocessp
);
3207 Qrun
= intern ("run");
3209 Qstop
= intern ("stop");
3211 Qsignal
= intern ("signal");
3212 staticpro (&Qsignal
);
3214 /* Qexit is already staticpro'd by syms_of_eval; don't staticpro it
3217 Qexit = intern ("exit");
3218 staticpro (&Qexit); */
3220 Qopen
= intern ("open");
3222 Qclosed
= intern ("closed");
3223 staticpro (&Qclosed
);
3225 staticpro (&Vprocess_alist
);
3227 DEFVAR_BOOL ("delete-exited-processes", &delete_exited_processes
,
3228 "*Non-nil means delete processes immediately when they exit.\n\
3229 nil means don't delete them until `list-processes' is run.");
3231 delete_exited_processes
= 1;
3233 DEFVAR_LISP ("process-connection-type", &Vprocess_connection_type
,
3234 "Control type of device used to communicate with subprocesses.\n\
3235 Values are nil to use a pipe, or t or `pty' to use a pty.\n\
3236 The value has no effect if the system has no ptys or if all ptys are busy:\n\
3237 then a pipe is used in any case.\n\
3238 The value takes effect when `start-process' is called.");
3239 Vprocess_connection_type
= Qt
;
3241 defsubr (&Sprocessp
);
3242 defsubr (&Sget_process
);
3243 defsubr (&Sget_buffer_process
);
3244 defsubr (&Sdelete_process
);
3245 defsubr (&Sprocess_status
);
3246 defsubr (&Sprocess_exit_status
);
3247 defsubr (&Sprocess_id
);
3248 defsubr (&Sprocess_name
);
3249 defsubr (&Sprocess_command
);
3250 defsubr (&Sset_process_buffer
);
3251 defsubr (&Sprocess_buffer
);
3252 defsubr (&Sprocess_mark
);
3253 defsubr (&Sset_process_filter
);
3254 defsubr (&Sprocess_filter
);
3255 defsubr (&Sset_process_sentinel
);
3256 defsubr (&Sset_process_window_size
);
3257 defsubr (&Sprocess_sentinel
);
3258 defsubr (&Sprocess_kill_without_query
);
3259 defsubr (&Slist_processes
);
3260 defsubr (&Sprocess_list
);
3261 defsubr (&Sstart_process
);
3263 defsubr (&Sopen_network_stream
);
3264 #endif /* HAVE_SOCKETS */
3265 defsubr (&Saccept_process_output
);
3266 defsubr (&Sprocess_send_region
);
3267 defsubr (&Sprocess_send_string
);
3268 defsubr (&Sinterrupt_process
);
3269 defsubr (&Skill_process
);
3270 defsubr (&Squit_process
);
3271 defsubr (&Sstop_process
);
3272 defsubr (&Scontinue_process
);
3273 defsubr (&Sprocess_send_eof
);
3274 defsubr (&Ssignal_process
);
3275 defsubr (&Swaiting_for_user_input_p
);
3276 /* defsubr (&Sprocess_connection); */
3280 #else /* not subprocesses */
3282 #include <sys/types.h>
3286 #include "systime.h"
3287 #include "termopts.h"
3289 extern int frame_garbaged
;
3292 /* As described above, except assuming that there are no subprocesses:
3294 Wait for timeout to elapse and/or keyboard input to be available.
3297 timeout in seconds, or
3298 zero for no limit, or
3299 -1 means gobble data immediately available but don't wait for any.
3301 read_kbd is a Lisp_Object:
3302 0 to ignore keyboard input, or
3303 1 to return when input is available, or
3304 -1 means caller will actually read the input, so don't throw to
3306 We know that read_kbd will never be a Lisp_Process, since
3307 `subprocesses' isn't defined.
3309 do_display != 0 means redisplay should be done to show subprocess
3310 output that arrives.
3312 Return true iff we received input from any process. */
3315 wait_reading_process_input (time_limit
, microsecs
, read_kbd
, do_display
)
3316 int time_limit
, microsecs
;
3317 Lisp_Object read_kbd
;
3320 EMACS_TIME end_time
, timeout
, *timeout_p
;
3323 /* What does time_limit really mean? */
3324 if (time_limit
|| microsecs
)
3326 /* It's not infinite. */
3327 timeout_p
= &timeout
;
3329 if (time_limit
== -1)
3330 /* In fact, it's zero. */
3331 EMACS_SET_SECS_USECS (timeout
, 0, 0);
3333 EMACS_SET_SECS_USECS (timeout
, time_limit
, microsecs
);
3335 /* How far in the future is that? */
3336 EMACS_GET_TIME (end_time
);
3337 EMACS_ADD_TIME (end_time
, end_time
, timeout
);
3340 /* It's infinite. */
3343 /* This must come before stop_polling. */
3344 prepare_menu_bars ();
3346 /* Turn off periodic alarms (in case they are in use)
3347 because the select emulator uses alarms. */
3354 waitchannels
= XINT (read_kbd
) ? 1 : 0;
3356 /* If calling from keyboard input, do not quit
3357 since we want to return C-g as an input character.
3358 Otherwise, do pending quit if requested. */
3359 if (XINT (read_kbd
) >= 0)
3364 EMACS_GET_TIME (*timeout_p
);
3365 EMACS_SUB_TIME (*timeout_p
, end_time
, *timeout_p
);
3366 if (EMACS_TIME_NEG_P (*timeout_p
))
3370 /* Cause C-g and alarm signals to take immediate action,
3371 and cause input available signals to zero out timeout. */
3372 if (XINT (read_kbd
) < 0)
3373 set_waiting_for_input (&timeout
);
3375 /* If a frame has been newly mapped and needs updating,
3376 reprocess its display stuff. */
3377 if (frame_garbaged
&& do_display
)
3378 redisplay_preserve_echo_area ();
3380 if (XINT (read_kbd
) && detect_input_pending ())
3383 nfds
= select (1, &waitchannels
, 0, 0, timeout_p
);
3385 /* Make C-g and alarm signals set flags again */
3386 clear_waiting_for_input ();
3388 /* If we woke up due to SIGWINCH, actually change size now. */
3389 do_pending_window_change ();
3393 /* If the system call was interrupted, then go around the
3399 else if (nfds
> 0 && (waitchannels
& 1) && interrupt_input
)
3400 /* System sometimes fails to deliver SIGIO. */
3401 kill (getpid (), SIGIO
);
3404 if (XINT (read_kbd
) && interrupt_input
&& (waitchannels
& 1))
3408 /* If we have timed out (nfds == 0) or found some input (nfds > 0),
3420 DEFUN ("get-buffer-process", Fget_buffer_process
, Sget_buffer_process
, 1, 1, 0,
3421 /* Don't confuse make-docfile by having two doc strings for this function.
3422 make-docfile does not pay attention to #if, for good reason! */
3425 register Lisp_Object name
;
3430 /* Kill all processes associated with `buffer'.
3431 If `buffer' is nil, kill all processes.
3432 Since we have no subprocesses, this does nothing. */
3434 kill_buffer_processes (buffer
)
3445 defsubr (&Sget_buffer_process
);
3449 #endif /* not subprocesses */