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
;
631 proc
= Fget_process (proc
);
633 proc
= get_process (proc
);
639 if (!NILP (p
->raw_status_low
))
642 if (XTYPE (status
) == Lisp_Cons
)
643 status
= XCONS (status
)->car
;
644 if (NETCONN_P (proc
))
646 if (EQ (status
, Qrun
))
648 else if (EQ (status
, Qexit
))
654 DEFUN ("process-exit-status", Fprocess_exit_status
, Sprocess_exit_status
,
656 "Return the exit status of PROCESS or the signal number that killed it.\n\
657 If PROCESS has not yet exited or died, return 0.")
659 register Lisp_Object proc
;
661 CHECK_PROCESS (proc
, 0);
662 if (!NILP (XPROCESS (proc
)->raw_status_low
))
663 update_status (XPROCESS (proc
));
664 if (XTYPE (XPROCESS (proc
)->status
) == Lisp_Cons
)
665 return XCONS (XCONS (XPROCESS (proc
)->status
)->cdr
)->car
;
666 return make_number (0);
669 DEFUN ("process-id", Fprocess_id
, Sprocess_id
, 1, 1, 0,
670 "Return the process id of PROCESS.\n\
671 This is the pid of the Unix process which PROCESS uses or talks to.\n\
672 For a network connection, this value is nil.")
674 register Lisp_Object proc
;
676 CHECK_PROCESS (proc
, 0);
677 return XPROCESS (proc
)->pid
;
680 DEFUN ("process-name", Fprocess_name
, Sprocess_name
, 1, 1, 0,
681 "Return the name of PROCESS, as a string.\n\
682 This is the name of the program invoked in PROCESS,\n\
683 possibly modified to make it unique among process names.")
685 register Lisp_Object proc
;
687 CHECK_PROCESS (proc
, 0);
688 return XPROCESS (proc
)->name
;
691 DEFUN ("process-command", Fprocess_command
, Sprocess_command
, 1, 1, 0,
692 "Return the command that was executed to start PROCESS.\n\
693 This is a list of strings, the first string being the program executed\n\
694 and the rest of the strings being the arguments given to it.\n\
695 For a non-child channel, this is nil.")
697 register Lisp_Object proc
;
699 CHECK_PROCESS (proc
, 0);
700 return XPROCESS (proc
)->command
;
703 DEFUN ("set-process-buffer", Fset_process_buffer
, Sset_process_buffer
,
705 "Set buffer associated with PROCESS to BUFFER (a buffer, or nil).")
707 register Lisp_Object proc
, buffer
;
709 CHECK_PROCESS (proc
, 0);
711 CHECK_BUFFER (buffer
, 1);
712 XPROCESS (proc
)->buffer
= buffer
;
716 DEFUN ("process-buffer", Fprocess_buffer
, Sprocess_buffer
,
718 "Return the buffer PROCESS is associated with.\n\
719 Output from PROCESS is inserted in this buffer\n\
720 unless PROCESS has a filter.")
722 register Lisp_Object proc
;
724 CHECK_PROCESS (proc
, 0);
725 return XPROCESS (proc
)->buffer
;
728 DEFUN ("process-mark", Fprocess_mark
, Sprocess_mark
,
730 "Return the marker for the end of the last output from PROCESS.")
732 register Lisp_Object proc
;
734 CHECK_PROCESS (proc
, 0);
735 return XPROCESS (proc
)->mark
;
738 DEFUN ("set-process-filter", Fset_process_filter
, Sset_process_filter
,
740 "Give PROCESS the filter function FILTER; nil means no filter.\n\
741 t means stop accepting output from the process.\n\
742 When a process has a filter, each time it does output\n\
743 the entire string of output is passed to the filter.\n\
744 The filter gets two arguments: the process and the string of output.\n\
745 If the process has a filter, its buffer is not used for output.")
747 register Lisp_Object proc
, filter
;
749 CHECK_PROCESS (proc
, 0);
751 FD_CLR (XINT (XPROCESS (proc
)->infd
), &input_wait_mask
);
752 else if (EQ (XPROCESS (proc
)->filter
, Qt
))
753 FD_SET (XINT (XPROCESS (proc
)->infd
), &input_wait_mask
);
754 XPROCESS (proc
)->filter
= filter
;
758 DEFUN ("process-filter", Fprocess_filter
, Sprocess_filter
,
760 "Returns the filter function of PROCESS; nil if none.\n\
761 See `set-process-filter' for more info on filter functions.")
763 register Lisp_Object proc
;
765 CHECK_PROCESS (proc
, 0);
766 return XPROCESS (proc
)->filter
;
769 DEFUN ("set-process-sentinel", Fset_process_sentinel
, Sset_process_sentinel
,
771 "Give PROCESS the sentinel SENTINEL; nil for none.\n\
772 The sentinel is called as a function when the process changes state.\n\
773 It gets two arguments: the process, and a string describing the change.")
775 register Lisp_Object proc
, sentinel
;
777 CHECK_PROCESS (proc
, 0);
778 XPROCESS (proc
)->sentinel
= sentinel
;
782 DEFUN ("process-sentinel", Fprocess_sentinel
, Sprocess_sentinel
,
784 "Return the sentinel of PROCESS; nil if none.\n\
785 See `set-process-sentinel' for more info on sentinels.")
787 register Lisp_Object proc
;
789 CHECK_PROCESS (proc
, 0);
790 return XPROCESS (proc
)->sentinel
;
793 DEFUN ("set-process-window-size", Fset_process_window_size
,
794 Sset_process_window_size
, 3, 3, 0,
795 "Tell PROCESS that it has logical window size HEIGHT and WIDTH.")
796 (proc
, height
, width
)
797 register Lisp_Object proc
, height
, width
;
799 CHECK_PROCESS (proc
, 0);
800 CHECK_NATNUM (height
, 0);
801 CHECK_NATNUM (width
, 0);
802 if (set_window_size (XINT (XPROCESS (proc
)->infd
),
803 XINT (height
), XINT(width
)) <= 0)
809 DEFUN ("process-kill-without-query", Fprocess_kill_without_query
,
810 Sprocess_kill_without_query
, 1, 2, 0,
811 "Say no query needed if PROCESS is running when Emacs is exited.\n\
812 Optional second argument if non-nil says to require a query.\n\
813 Value is t if a query was formerly required.")
815 register Lisp_Object proc
, value
;
819 CHECK_PROCESS (proc
, 0);
820 tem
= XPROCESS (proc
)->kill_without_query
;
821 XPROCESS (proc
)->kill_without_query
= Fnull (value
);
826 #if 0 /* Turned off because we don't currently record this info
827 in the process. Perhaps add it. */
828 DEFUN ("process-connection", Fprocess_connection
, Sprocess_connection
, 1, 1, 0,
829 "Return the connection type of `PROCESS'.\n\
830 The value is `nil' for a pipe,\n\
831 `t' or `pty' for a pty, or `stream' for a socket connection.")
835 return XPROCESS (process
)->type
;
842 register Lisp_Object tail
, tem
;
843 Lisp_Object proc
, minspace
, tem1
;
844 register struct buffer
*old
= current_buffer
;
845 register struct Lisp_Process
*p
;
849 XFASTINT (minspace
) = 1;
851 set_buffer_internal (XBUFFER (Vstandard_output
));
852 Fbuffer_disable_undo (Vstandard_output
);
854 current_buffer
->truncate_lines
= Qt
;
857 Proc Status Buffer Command\n\
858 ---- ------ ------ -------\n", -1);
860 for (tail
= Vprocess_alist
; !NILP (tail
); tail
= Fcdr (tail
))
864 proc
= Fcdr (Fcar (tail
));
866 if (NILP (p
->childp
))
869 Finsert (1, &p
->name
);
870 Findent_to (make_number (13), minspace
);
872 if (!NILP (p
->raw_status_low
))
875 if (XTYPE (p
->status
) == Lisp_Cons
)
876 symbol
= XCONS (p
->status
)->car
;
879 if (EQ (symbol
, Qsignal
))
882 tem
= Fcar (Fcdr (p
->status
));
884 if (XINT (tem
) < NSIG
)
885 write_string (sys_errlist
[XINT (tem
)], -1);
888 Fprinc (symbol
, Qnil
);
890 else if (NETCONN_P (proc
))
892 if (EQ (symbol
, Qrun
))
893 write_string ("open", -1);
894 else if (EQ (symbol
, Qexit
))
895 write_string ("closed", -1);
897 Fprinc (symbol
, Qnil
);
900 Fprinc (symbol
, Qnil
);
902 if (EQ (symbol
, Qexit
))
905 tem
= Fcar (Fcdr (p
->status
));
908 sprintf (tembuf
, " %d", XFASTINT (tem
));
909 write_string (tembuf
, -1);
913 if (EQ (symbol
, Qsignal
) || EQ (symbol
, Qexit
))
914 remove_process (proc
);
916 Findent_to (make_number (22), minspace
);
917 if (NILP (p
->buffer
))
918 insert_string ("(none)");
919 else if (NILP (XBUFFER (p
->buffer
)->name
))
920 insert_string ("(Killed)");
922 Finsert (1, &XBUFFER (p
->buffer
)->name
);
924 Findent_to (make_number (37), minspace
);
926 if (NETCONN_P (proc
))
928 sprintf (tembuf
, "(network stream connection to %s)\n",
929 XSTRING (p
->childp
)->data
);
930 insert_string (tembuf
);
944 insert_string ("\n");
950 DEFUN ("list-processes", Flist_processes
, Slist_processes
, 0, 0, "",
951 "Display a list of all processes.\n\
952 \(Any processes listed as Exited or Signaled are actually eliminated\n\
953 after the listing is made.)")
956 internal_with_output_to_temp_buffer ("*Process List*",
957 list_processes_1
, Qnil
);
961 DEFUN ("process-list", Fprocess_list
, Sprocess_list
, 0, 0, 0,
962 "Return a list of all processes.")
965 return Fmapcar (Qcdr
, Vprocess_alist
);
968 /* Starting asynchronous inferior processes. */
970 static Lisp_Object
start_process_unwind ();
972 DEFUN ("start-process", Fstart_process
, Sstart_process
, 3, MANY
, 0,
973 "Start a program in a subprocess. Return the process object for it.\n\
974 Args are NAME BUFFER PROGRAM &rest PROGRAM-ARGS\n\
975 NAME is name for process. It is modified if necessary to make it unique.\n\
976 BUFFER is the buffer or (buffer-name) to associate with the process.\n\
977 Process output goes at end of that buffer, unless you specify\n\
978 an output stream or filter function to handle the output.\n\
979 BUFFER may be also nil, meaning that this process is not associated\n\
981 Third arg is program file name. It is searched for as in the shell.\n\
982 Remaining arguments are strings to give program as arguments.")
985 register Lisp_Object
*args
;
987 Lisp_Object buffer
, name
, program
, proc
, current_dir
, tem
;
989 register unsigned char *new_argv
;
992 register unsigned char **new_argv
;
995 int count
= specpdl_ptr
- specpdl
;
999 buffer
= Fget_buffer_create (buffer
);
1001 /* Make sure that the child will be able to chdir to the current
1002 buffer's current directory, or its unhandled equivalent. We
1003 can't just have the child check for an error when it does the
1004 chdir, since it's in a vfork.
1006 We have to GCPRO around this because Fexpand_file_name and
1007 Funhandled_file_name_directory might call a file name handling
1008 function. The argument list is protected by the caller, so all
1009 we really have to worry about is buffer. */
1011 struct gcpro gcpro1
, gcpro2
;
1013 current_dir
= current_buffer
->directory
;
1015 GCPRO2 (buffer
, current_dir
);
1018 expand_and_dir_to_file
1019 (Funhandled_file_name_directory (current_dir
), Qnil
);
1020 if (NILP (Ffile_accessible_directory_p (current_dir
)))
1021 report_file_error ("Setting current directory",
1022 Fcons (current_buffer
->directory
, Qnil
));
1028 CHECK_STRING (name
, 0);
1032 CHECK_STRING (program
, 2);
1035 /* Make a one member argv with all args concatenated
1036 together separated by a blank. */
1037 len
= XSTRING (program
)->size
+ 2;
1038 for (i
= 3; i
< nargs
; i
++)
1041 CHECK_STRING (tem
, i
);
1042 len
+= XSTRING (tem
)->size
+ 1; /* count the blank */
1044 new_argv
= (unsigned char *) alloca (len
);
1045 strcpy (new_argv
, XSTRING (program
)->data
);
1046 for (i
= 3; i
< nargs
; i
++)
1049 CHECK_STRING (tem
, i
);
1050 strcat (new_argv
, " ");
1051 strcat (new_argv
, XSTRING (tem
)->data
);
1053 /* Need to add code here to check for program existence on VMS */
1056 new_argv
= (unsigned char **) alloca ((nargs
- 1) * sizeof (char *));
1058 /* If program file name is not absolute, search our path for it */
1059 if (XSTRING (program
)->data
[0] != '/')
1061 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
;
1064 GCPRO4 (name
, program
, buffer
, current_dir
);
1065 openp (Vexec_path
, program
, EXEC_SUFFIXES
, &tem
, 1);
1068 report_file_error ("Searching for program", Fcons (program
, Qnil
));
1069 new_argv
[0] = XSTRING (tem
)->data
;
1072 new_argv
[0] = XSTRING (program
)->data
;
1074 for (i
= 3; i
< nargs
; i
++)
1077 CHECK_STRING (tem
, i
);
1078 new_argv
[i
- 2] = XSTRING (tem
)->data
;
1080 new_argv
[i
- 2] = 0;
1081 #endif /* not VMS */
1083 proc
= make_process (name
);
1084 /* If an error occurs and we can't start the process, we want to
1085 remove it from the process list. This means that each error
1086 check in create_process doesn't need to call remove_process
1087 itself; it's all taken care of here. */
1088 record_unwind_protect (start_process_unwind
, proc
);
1090 XPROCESS (proc
)->childp
= Qt
;
1091 XPROCESS (proc
)->command_channel_p
= Qnil
;
1092 XPROCESS (proc
)->buffer
= buffer
;
1093 XPROCESS (proc
)->sentinel
= Qnil
;
1094 XPROCESS (proc
)->filter
= Qnil
;
1095 XPROCESS (proc
)->command
= Flist (nargs
- 2, args
+ 2);
1097 create_process (proc
, new_argv
, current_dir
);
1099 return unbind_to (count
, proc
);
1102 /* This function is the unwind_protect form for Fstart_process. If
1103 PROC doesn't have its pid set, then we know someone has signalled
1104 an error and the process wasn't started successfully, so we should
1105 remove it from the process list. */
1107 start_process_unwind (proc
)
1110 if (XTYPE (proc
) != Lisp_Process
)
1113 /* Was PROC started successfully? */
1114 if (XINT (XPROCESS (proc
)->pid
) <= 0)
1115 remove_process (proc
);
1122 create_process_1 (signo
)
1126 /* USG systems forget handlers when they are used;
1127 must reestablish each time */
1128 signal (signo
, create_process_1
);
1132 #if 0 /* This doesn't work; see the note before sigchld_handler. */
1135 /* Mimic blocking of signals on system V, which doesn't really have it. */
1137 /* Nonzero means we got a SIGCHLD when it was supposed to be blocked. */
1138 int sigchld_deferred
;
1141 create_process_sigchld ()
1143 signal (SIGCHLD
, create_process_sigchld
);
1145 sigchld_deferred
= 1;
1151 #ifndef VMS /* VMS version of this function is in vmsproc.c. */
1152 create_process (process
, new_argv
, current_dir
)
1153 Lisp_Object process
;
1155 Lisp_Object current_dir
;
1157 int pid
, inchannel
, outchannel
, forkin
, forkout
;
1160 SIGTYPE (*sigchld
)();
1163 extern char **environ
;
1165 inchannel
= outchannel
= -1;
1168 if (!NILP (Vprocess_connection_type
))
1169 outchannel
= inchannel
= allocate_pty ();
1174 /* On USG systems it does not work to open the pty's tty here
1175 and then close and reopen it in the child. */
1177 /* Don't let this terminal become our controlling terminal
1178 (in case we don't have one). */
1179 forkout
= forkin
= open (pty_name
, O_RDWR
| O_NOCTTY
, 0);
1181 forkout
= forkin
= open (pty_name
, O_RDWR
, 0);
1184 report_file_error ("Opening pty", Qnil
);
1186 forkin
= forkout
= -1;
1187 #endif /* not USG */
1191 #endif /* HAVE_PTYS */
1194 if (socketpair (AF_UNIX
, SOCK_STREAM
, 0, sv
) < 0)
1195 report_file_error ("Opening socketpair", Qnil
);
1196 outchannel
= inchannel
= sv
[0];
1197 forkout
= forkin
= sv
[1];
1199 #else /* not SKTPAIR */
1208 #endif /* not SKTPAIR */
1211 /* Replaced by close_process_descs */
1212 set_exclusive_use (inchannel
);
1213 set_exclusive_use (outchannel
);
1216 /* Stride people say it's a mystery why this is needed
1217 as well as the O_NDELAY, but that it fails without this. */
1218 #if defined (STRIDE) || (defined (pfa) && defined (HAVE_PTYS))
1221 ioctl (inchannel
, FIONBIO
, &one
);
1226 fcntl (inchannel
, F_SETFL
, O_NONBLOCK
);
1229 fcntl (inchannel
, F_SETFL
, O_NDELAY
);
1233 /* Record this as an active process, with its channels.
1234 As a result, child_setup will close Emacs's side of the pipes. */
1235 chan_process
[inchannel
] = process
;
1236 XSET (XPROCESS (process
)->infd
, Lisp_Int
, inchannel
);
1237 XSET (XPROCESS (process
)->outfd
, Lisp_Int
, outchannel
);
1238 /* Record the tty descriptor used in the subprocess. */
1240 XPROCESS (process
)->subtty
= Qnil
;
1242 XFASTINT (XPROCESS (process
)->subtty
) = forkin
;
1243 XPROCESS (process
)->pty_flag
= (pty_flag
? Qt
: Qnil
);
1244 XPROCESS (process
)->status
= Qrun
;
1246 /* Delay interrupts until we have a chance to store
1247 the new fork's pid in its process structure */
1251 #else /* not BSD4_1 */
1252 #if defined (BSD) || defined (UNIPLUS) || defined (HPUX)
1253 sigsetmask (sigmask (SIGCHLD
));
1254 #else /* ordinary USG */
1256 sigchld_deferred
= 0;
1257 sigchld
= signal (SIGCHLD
, create_process_sigchld
);
1259 #endif /* ordinary USG */
1260 #endif /* not BSD4_1 */
1261 #endif /* SIGCHLD */
1263 FD_SET (inchannel
, &input_wait_mask
);
1264 if (inchannel
> max_process_desc
)
1265 max_process_desc
= inchannel
;
1267 /* Until we store the proper pid, enable sigchld_handler
1268 to recognize an unknown pid as standing for this process.
1269 It is very important not to let this `marker' value stay
1270 in the table after this function has returned; if it does
1271 it might cause call-process to hang and subsequent asynchronous
1272 processes to get their return values scrambled. */
1273 XSETINT (XPROCESS (process
)->pid
, -1);
1276 /* child_setup must clobber environ on systems with true vfork.
1277 Protect it from permanent change. */
1278 char **save_environ
= environ
;
1283 int xforkin
= forkin
;
1284 int xforkout
= forkout
;
1286 #if 0 /* This was probably a mistake--it duplicates code later on,
1287 but fails to handle all the cases. */
1288 /* Make sure SIGCHLD is not blocked in the child. */
1289 sigsetmask (SIGEMPTYMASK
);
1292 /* Make the pty be the controlling terminal of the process. */
1294 /* First, disconnect its current controlling terminal. */
1296 /* We tried doing setsid only if pty_flag, but it caused
1297 process_set_signal to fail on SGI when using a pipe. */
1299 /* Make the pty's terminal the controlling terminal. */
1303 /* We ignore the return value
1304 because faith@cs.unc.edu says that is necessary on Linux. */
1305 ioctl (xforkin
, TIOCSCTTY
, 0);
1308 #else /* not HAVE_SETSID */
1310 /* It's very important to call setpgrp here and no time
1311 afterwards. Otherwise, we lose our controlling tty which
1312 is set when we open the pty. */
1315 #endif /* not HAVE_SETSID */
1316 #if defined (HAVE_TERMIOS) && defined (LDISC1)
1317 if (pty_flag
&& xforkin
>= 0)
1320 tcgetattr (xforkin
, &t
);
1322 if (tcsetattr (xforkin
, TCSANOW
, &t
) < 0)
1323 write (1, "create_process/tcsetattr LDISC1 failed\n", 39);
1326 #if defined (NTTYDISC) && defined (TIOCSETD)
1327 if (pty_flag
&& xforkin
>= 0)
1329 /* Use new line discipline. */
1330 int ldisc
= NTTYDISC
;
1331 ioctl (xforkin
, TIOCSETD
, &ldisc
);
1336 /* In 4.3BSD, the TIOCSPGRP bug has been fixed, and now you
1337 can do TIOCSPGRP only to the process's controlling tty. */
1340 /* I wonder: would just ioctl (0, TIOCNOTTY, 0) work here?
1341 I can't test it since I don't have 4.3. */
1342 int j
= open ("/dev/tty", O_RDWR
, 0);
1343 ioctl (j
, TIOCNOTTY
, 0);
1346 /* In order to get a controlling terminal on some versions
1347 of BSD, it is necessary to put the process in pgrp 0
1348 before it opens the terminal. */
1352 #endif /* TIOCNOTTY */
1354 #if !defined (RTU) && !defined (UNIPLUS)
1355 /*** There is a suggestion that this ought to be a
1356 conditional on TIOCSPGRP. */
1357 /* Now close the pty (if we had it open) and reopen it.
1358 This makes the pty the controlling terminal of the subprocess. */
1361 #ifdef SET_CHILD_PTY_PGRP
1362 int pgrp
= getpid ();
1365 /* I wonder if close (open (pty_name, ...)) would work? */
1368 xforkout
= xforkin
= open (pty_name
, O_RDWR
, 0);
1370 #ifdef SET_CHILD_PTY_PGRP
1371 ioctl (xforkin
, TIOCSPGRP
, &pgrp
);
1372 ioctl (xforkout
, TIOCSPGRP
, &pgrp
);
1378 #endif /* not UNIPLUS and not RTU */
1379 #ifdef SETUP_SLAVE_PTY
1384 #endif /* SETUP_SLAVE_PTY */
1386 /* On AIX, we've disabled SIGHUP above once we start a child on a pty.
1387 Now reenable it in the child, so it will die when we want it to. */
1389 signal (SIGHUP
, SIG_DFL
);
1391 #endif /* HAVE_PTYS */
1396 #else /* not BSD4_1 */
1397 #if defined (BSD) || defined (UNIPLUS) || defined (HPUX)
1398 sigsetmask (SIGEMPTYMASK
);
1399 #else /* ordinary USG */
1401 signal (SIGCHLD
, sigchld
);
1403 #endif /* ordinary USG */
1404 #endif /* not BSD4_1 */
1405 #endif /* SIGCHLD */
1408 child_setup_tty (xforkout
);
1409 child_setup (xforkin
, xforkout
, xforkout
,
1410 new_argv
, 1, current_dir
);
1412 environ
= save_environ
;
1419 if (forkin
!= forkout
&& forkout
>= 0)
1421 report_file_error ("Doing vfork", Qnil
);
1424 XFASTINT (XPROCESS (process
)->pid
) = pid
;
1426 /* If the subfork execv fails, and it exits,
1427 this close hangs. I don't know why.
1428 So have an interrupt jar it loose. */
1430 signal (SIGALRM
, create_process_1
);
1432 XPROCESS (process
)->subtty
= Qnil
;
1437 if (forkin
!= forkout
&& forkout
>= 0)
1443 #else /* not BSD4_1 */
1444 #if defined (BSD) || defined (UNIPLUS) || defined (HPUX)
1445 sigsetmask (SIGEMPTYMASK
);
1446 #else /* ordinary USG */
1448 signal (SIGCHLD
, sigchld
);
1449 /* Now really handle any of these signals
1450 that came in during this function. */
1451 if (sigchld_deferred
)
1452 kill (getpid (), SIGCHLD
);
1454 #endif /* ordinary USG */
1455 #endif /* not BSD4_1 */
1456 #endif /* SIGCHLD */
1458 #endif /* not VMS */
1462 /* open a TCP network connection to a given HOST/SERVICE. Treated
1463 exactly like a normal process when reading and writing. Only
1464 differences are in status display and process deletion. A network
1465 connection has no PID; you cannot signal it. All you can do is
1466 deactivate and close it via delete-process */
1468 DEFUN ("open-network-stream", Fopen_network_stream
, Sopen_network_stream
,
1470 "Open a TCP connection for a service to a host.\n\
1471 Returns a subprocess-object to represent the connection.\n\
1472 Input and output work as for subprocesses; `delete-process' closes it.\n\
1473 Args are NAME BUFFER HOST SERVICE.\n\
1474 NAME is name for process. It is modified if necessary to make it unique.\n\
1475 BUFFER is the buffer (or buffer-name) to associate with the process.\n\
1476 Process output goes at end of that buffer, unless you specify\n\
1477 an output stream or filter function to handle the output.\n\
1478 BUFFER may be also nil, meaning that this process is not associated\n\
1480 Third arg is name of the host to connect to, or its IP address.\n\
1481 Fourth arg SERVICE is name of the service desired, or an integer\n\
1482 specifying a port number to connect to.")
1483 (name
, buffer
, host
, service
)
1484 Lisp_Object name
, buffer
, host
, service
;
1488 struct sockaddr_in address
;
1489 struct servent
*svc_info
;
1490 struct hostent
*host_info_ptr
, host_info
;
1491 char *(addr_list
[2]);
1492 IN_ADDR numeric_addr
;
1496 struct hostent host_info_fixed
;
1497 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
;
1499 int count
= specpdl_ptr
- specpdl
;
1501 GCPRO4 (name
, buffer
, host
, service
);
1502 CHECK_STRING (name
, 0);
1503 CHECK_STRING (host
, 0);
1504 if (XTYPE (service
) == Lisp_Int
)
1505 port
= htons ((unsigned short) XINT (service
));
1508 CHECK_STRING (service
, 0);
1509 svc_info
= getservbyname (XSTRING (service
)->data
, "tcp");
1511 error ("Unknown service \"%s\"", XSTRING (service
)->data
);
1512 port
= svc_info
->s_port
;
1516 host_info_ptr
= gethostbyname (XSTRING (host
)->data
);
1517 if (host_info_ptr
== 0)
1518 /* Attempt to interpret host as numeric inet address */
1520 numeric_addr
= inet_addr ((char *) XSTRING (host
)->data
);
1521 if (NUMERIC_ADDR_ERROR
)
1522 error ("Unknown host \"%s\"", XSTRING (host
)->data
);
1524 host_info_ptr
= &host_info
;
1525 host_info
.h_name
= 0;
1526 host_info
.h_aliases
= 0;
1527 host_info
.h_addrtype
= AF_INET
;
1529 /* Older machines have only one address slot called h_addr.
1530 Newer machines have h_addr_list, but #define h_addr to
1531 be its first element. */
1532 host_info
.h_addr_list
= &(addr_list
[0]);
1534 host_info
.h_addr
= (char*)(&numeric_addr
);
1536 host_info
.h_length
= strlen (addr_list
[0]);
1539 bzero (&address
, sizeof address
);
1540 bcopy (host_info_ptr
->h_addr
, (char *) &address
.sin_addr
,
1541 host_info_ptr
->h_length
);
1542 address
.sin_family
= host_info_ptr
->h_addrtype
;
1543 address
.sin_port
= port
;
1545 s
= socket (host_info_ptr
->h_addrtype
, SOCK_STREAM
, 0);
1547 report_file_error ("error creating socket", Fcons (name
, Qnil
));
1549 /* Kernel bugs (on Ultrix at least) cause lossage (not just EINTR)
1550 when connect is interrupted. So let's not let it get interrupted.
1551 Note we do not turn off polling, because polling is only used
1552 when not interrupt_input, and thus not normally used on the systems
1553 which have this bug. On systems which use polling, there's no way
1554 to quit if polling is turned off. */
1555 if (interrupt_input
)
1558 /* Slow down polling to every ten seconds.
1559 Some kernels have a bug which causes retrying connect to fail
1561 #ifdef POLL_FOR_INPUT
1562 bind_polling_period (10);
1566 if (connect (s
, (struct sockaddr
*) &address
, sizeof address
) == -1
1567 && errno
!= EISCONN
)
1573 if (errno
== EADDRINUSE
&& retry
< 20)
1581 if (interrupt_input
)
1585 report_file_error ("connection failed",
1586 Fcons (host
, Fcons (name
, Qnil
)));
1589 #ifdef POLL_FOR_INPUT
1590 unbind_to (count
, Qnil
);
1593 if (interrupt_input
)
1597 s
= connect_server (0);
1599 report_file_error ("error creating socket", Fcons (name
, Qnil
));
1600 send_command (s
, C_PORT
, 0, "%s:%d", XSTRING (host
)->data
, ntohs (port
));
1601 send_command (s
, C_DUMB
, 1, 0);
1607 report_file_error ("error duplicating socket", Fcons (name
, Qnil
));
1610 buffer
= Fget_buffer_create (buffer
);
1611 proc
= make_process (name
);
1613 chan_process
[inch
] = proc
;
1616 fcntl (inch
, F_SETFL
, O_NONBLOCK
);
1619 fcntl (inch
, F_SETFL
, O_NDELAY
);
1623 XPROCESS (proc
)->childp
= host
;
1624 XPROCESS (proc
)->command_channel_p
= Qnil
;
1625 XPROCESS (proc
)->buffer
= buffer
;
1626 XPROCESS (proc
)->sentinel
= Qnil
;
1627 XPROCESS (proc
)->filter
= Qnil
;
1628 XPROCESS (proc
)->command
= Qnil
;
1629 XPROCESS (proc
)->pid
= Qnil
;
1630 XSET (XPROCESS (proc
)->infd
, Lisp_Int
, s
);
1631 XSET (XPROCESS (proc
)->outfd
, Lisp_Int
, outch
);
1632 XPROCESS (proc
)->status
= Qrun
;
1633 FD_SET (inch
, &input_wait_mask
);
1634 if (inch
> max_process_desc
)
1635 max_process_desc
= inch
;
1640 #endif /* HAVE_SOCKETS */
1642 deactivate_process (proc
)
1645 register int inchannel
, outchannel
;
1646 register struct Lisp_Process
*p
= XPROCESS (proc
);
1648 inchannel
= XINT (p
->infd
);
1649 outchannel
= XINT (p
->outfd
);
1653 /* Beware SIGCHLD hereabouts. */
1654 flush_pending_output (inchannel
);
1657 VMS_PROC_STUFF
*get_vms_process_pointer (), *vs
;
1658 sys$
dassgn (outchannel
);
1659 vs
= get_vms_process_pointer (p
->pid
);
1661 give_back_vms_process_stuff (vs
);
1665 if (outchannel
>= 0 && outchannel
!= inchannel
)
1669 XSET (p
->infd
, Lisp_Int
, -1);
1670 XSET (p
->outfd
, Lisp_Int
, -1);
1671 chan_process
[inchannel
] = Qnil
;
1672 FD_CLR (inchannel
, &input_wait_mask
);
1673 if (inchannel
== max_process_desc
)
1676 /* We just closed the highest-numbered process input descriptor,
1677 so recompute the highest-numbered one now. */
1678 max_process_desc
= 0;
1679 for (i
= 0; i
< MAXDESC
; i
++)
1680 if (!NILP (chan_process
[i
]))
1681 max_process_desc
= i
;
1686 /* Close all descriptors currently in use for communication
1687 with subprocess. This is used in a newly-forked subprocess
1688 to get rid of irrelevant descriptors. */
1690 close_process_descs ()
1693 for (i
= 0; i
< MAXDESC
; i
++)
1695 Lisp_Object process
;
1696 process
= chan_process
[i
];
1697 if (!NILP (process
))
1699 int in
= XINT (XPROCESS (process
)->infd
);
1700 int out
= XINT (XPROCESS (process
)->outfd
);
1703 if (out
>= 0 && in
!= out
)
1709 DEFUN ("accept-process-output", Faccept_process_output
, Saccept_process_output
,
1711 "Allow any pending output from subprocesses to be read by Emacs.\n\
1712 It is read into the process' buffers or given to their filter functions.\n\
1713 Non-nil arg PROCESS means do not return until some output has been received\n\
1715 Non-nil second arg TIMEOUT and third arg TIMEOUT-MSECS are number of\n\
1716 seconds and microseconds to wait; return after that much time whether\n\
1717 or not there is input.\n\
1718 Return non-nil iff we received any output before the timeout expired.")
1719 (proc
, timeout
, timeout_msecs
)
1720 register Lisp_Object proc
, timeout
, timeout_msecs
;
1725 if (! NILP (timeout_msecs
))
1727 CHECK_NUMBER (timeout_msecs
, 2);
1728 useconds
= XINT (timeout_msecs
);
1729 if (XTYPE (timeout
) != Lisp_Int
)
1730 XSET (timeout
, Lisp_Int
, 0);
1733 int carry
= useconds
/ 1000000;
1735 XSETINT (timeout
, XINT (timeout
) + carry
);
1736 useconds
-= carry
* 1000000;
1738 /* I think this clause is necessary because C doesn't
1739 guarantee a particular rounding direction for negative
1743 XSETINT (timeout
, XINT (timeout
) - 1);
1744 useconds
+= 1000000;
1751 if (! NILP (timeout
))
1753 CHECK_NUMBER (timeout
, 1);
1754 seconds
= XINT (timeout
);
1767 XFASTINT (proc
) = 0;
1770 (wait_reading_process_input (seconds
, useconds
, proc
, 0)
1774 /* This variable is different from waiting_for_input in keyboard.c.
1775 It is used to communicate to a lisp process-filter/sentinel (via the
1776 function Fwaiting_for_user_input_p below) whether emacs was waiting
1777 for user-input when that process-filter was called.
1778 waiting_for_input cannot be used as that is by definition 0 when
1779 lisp code is being evalled */
1780 static int waiting_for_user_input_p
;
1782 /* Read and dispose of subprocess output while waiting for timeout to
1783 elapse and/or keyboard input to be available.
1786 timeout in seconds, or
1787 zero for no limit, or
1788 -1 means gobble data immediately available but don't wait for any.
1791 an additional duration to wait, measured in microseconds.
1792 If this is nonzero and time_limit is 0, then the timeout
1793 consists of MICROSECS only.
1795 READ_KBD is a lisp value:
1796 0 to ignore keyboard input, or
1797 1 to return when input is available, or
1798 -1 meaning caller will actually read the input, so don't throw to
1799 the quit handler, or
1800 a cons cell, meaning wait until its car is non-nil
1801 (and gobble terminal input into the buffer if any arrives), or
1802 a process object, meaning wait until something arrives from that
1803 process. The return value is true iff we read some input from
1806 DO_DISPLAY != 0 means redisplay should be done to show subprocess
1807 output that arrives.
1809 If READ_KBD is a pointer to a struct Lisp_Process, then the
1810 function returns true iff we received input from that process
1811 before the timeout elapsed.
1812 Otherwise, return true iff we received input from any process. */
1814 wait_reading_process_input (time_limit
, microsecs
, read_kbd
, do_display
)
1815 int time_limit
, microsecs
;
1816 Lisp_Object read_kbd
;
1819 register int channel
, nfds
, m
;
1820 static SELECT_TYPE Available
;
1823 EMACS_TIME timeout
, end_time
, garbage
;
1825 int wait_channel
= -1;
1826 struct Lisp_Process
*wait_proc
= 0;
1827 int got_some_input
= 0;
1828 Lisp_Object
*wait_for_cell
= 0;
1830 FD_ZERO (&Available
);
1832 /* If read_kbd is a process to watch, set wait_proc and wait_channel
1834 if (XTYPE (read_kbd
) == Lisp_Process
)
1836 wait_proc
= XPROCESS (read_kbd
);
1837 wait_channel
= XINT (wait_proc
->infd
);
1838 XFASTINT (read_kbd
) = 0;
1841 /* If waiting for non-nil in a cell, record where. */
1842 if (XTYPE (read_kbd
) == Lisp_Cons
)
1844 wait_for_cell
= &XCONS (read_kbd
)->car
;
1845 XFASTINT (read_kbd
) = 0;
1848 waiting_for_user_input_p
= XINT (read_kbd
);
1850 /* Since we may need to wait several times,
1851 compute the absolute time to return at. */
1852 if (time_limit
|| microsecs
)
1854 EMACS_GET_TIME (end_time
);
1855 EMACS_SET_SECS_USECS (timeout
, time_limit
, microsecs
);
1856 EMACS_ADD_TIME (end_time
, end_time
, timeout
);
1859 /* It would not be safe to call this below,
1860 where we call redisplay_preserve_echo_area. */
1861 if (do_display
&& frame_garbaged
)
1862 prepare_menu_bars ();
1866 /* If calling from keyboard input, do not quit
1867 since we want to return C-g as an input character.
1868 Otherwise, do pending quit if requested. */
1869 if (XINT (read_kbd
) >= 0)
1872 /* Exit now if the cell we're waiting for became non-nil. */
1873 if (wait_for_cell
&& ! NILP (*wait_for_cell
))
1876 /* Compute time from now till when time limit is up */
1877 /* Exit if already run out */
1878 if (time_limit
== -1)
1880 /* -1 specified for timeout means
1881 gobble output available now
1882 but don't wait at all. */
1884 EMACS_SET_SECS_USECS (timeout
, 0, 0);
1886 else if (time_limit
|| microsecs
)
1888 EMACS_GET_TIME (timeout
);
1889 EMACS_SUB_TIME (timeout
, end_time
, timeout
);
1890 if (EMACS_TIME_NEG_P (timeout
))
1895 EMACS_SET_SECS_USECS (timeout
, 100000, 0);
1898 /* Cause C-g and alarm signals to take immediate action,
1899 and cause input available signals to zero out timeout.
1901 It is important that we do this before checking for process
1902 activity. If we get a SIGCHLD after the explicit checks for
1903 process activity, timeout is the only way we will know. */
1904 if (XINT (read_kbd
) < 0)
1905 set_waiting_for_input (&timeout
);
1907 /* If status of something has changed, and no input is
1908 available, notify the user of the change right away. After
1909 this explicit check, we'll let the SIGCHLD handler zap
1910 timeout to get our attention. */
1911 if (update_tick
!= process_tick
&& do_display
)
1913 Atemp
= input_wait_mask
;
1914 EMACS_SET_SECS_USECS (timeout
, 0, 0);
1915 if (select (MAXDESC
, &Atemp
, 0, 0, &timeout
) <= 0)
1917 /* It's okay for us to do this and then continue with
1918 the loop, since timeout has already been zeroed out. */
1919 clear_waiting_for_input ();
1924 /* Don't wait for output from a non-running process. */
1925 if (wait_proc
!= 0 && !NILP (wait_proc
->raw_status_low
))
1926 update_status (wait_proc
);
1928 && ! EQ (wait_proc
->status
, Qrun
))
1930 clear_waiting_for_input ();
1934 /* Wait till there is something to do */
1936 Available
= input_wait_mask
;
1937 /* We used to have && wait_for_cell == 0
1938 but that led to lossage handling selection_request events:
1939 within one, we would start to handle another. */
1940 if (! XINT (read_kbd
))
1941 FD_CLR (keyboard_descriptor
, &Available
);
1943 /* If frame size has changed or the window is newly mapped,
1944 redisplay now, before we start to wait. There is a race
1945 condition here; if a SIGIO arrives between now and the select
1946 and indicates that a frame is trashed, the select may block
1947 displaying a trashed screen. */
1948 if (frame_garbaged
&& do_display
)
1949 redisplay_preserve_echo_area ();
1951 if (XINT (read_kbd
) && detect_input_pending ())
1954 FD_ZERO (&Available
);
1957 nfds
= select (MAXDESC
, &Available
, 0, 0, &timeout
);
1961 /* Make C-g and alarm signals set flags again */
1962 clear_waiting_for_input ();
1964 /* If we woke up due to SIGWINCH, actually change size now. */
1965 do_pending_window_change ();
1967 if (time_limit
&& nfds
== 0) /* timeout elapsed */
1971 if (xerrno
== EINTR
)
1972 FD_ZERO (&Available
);
1974 /* Ultrix select seems to return ENOMEM when it is
1975 interrupted. Treat it just like EINTR. Bleah. Note
1976 that we want to test for the "ultrix" CPP symbol, not
1977 "__ultrix__"; the latter is only defined under GCC, but
1978 not by DEC's bundled CC. -JimB */
1979 else if (xerrno
== ENOMEM
)
1980 FD_ZERO (&Available
);
1983 /* This happens for no known reason on ALLIANT.
1984 I am guessing that this is the right response. -- RMS. */
1985 else if (xerrno
== EFAULT
)
1986 FD_ZERO (&Available
);
1988 else if (xerrno
== EBADF
)
1991 /* AIX doesn't handle PTY closure the same way BSD does. On AIX,
1992 the child's closure of the pts gives the parent a SIGHUP, and
1993 the ptc file descriptor is automatically closed,
1994 yielding EBADF here or at select() call above.
1995 So, SIGHUP is ignored (see def of PTY_TTY_NAME_SPRINTF
1996 in m/ibmrt-aix.h), and here we just ignore the select error.
1997 Cleanup occurs c/o status_notify after SIGCLD. */
1998 FD_ZERO (&Available
); /* Cannot depend on values returned */
2004 error("select error: %s", strerror (xerrno
));
2006 #if defined(sun) && !defined(USG5_4)
2007 else if (nfds
> 0 && FD_ISSET (keyboard_descriptor
, &Available
)
2009 /* System sometimes fails to deliver SIGIO.
2011 David J. Mackenzie says that Emacs doesn't compile under
2012 Solaris if this code is enabled, thus the USG5_4 in the CPP
2013 conditional. "I haven't noticed any ill effects so far.
2014 If you find a Solaris expert somewhere, they might know
2016 kill (getpid (), SIGIO
);
2019 /* Check for keyboard input */
2020 /* If there is any, return immediately
2021 to give it higher priority than subprocesses */
2023 /* We used to do this if wait_for_cell,
2024 but that caused infinite recursion in selection request events. */
2025 if ((XINT (read_kbd
))
2026 && detect_input_pending ())
2029 if (detect_input_pending ())
2033 /* Exit now if the cell we're waiting for became non-nil. */
2034 if (wait_for_cell
&& ! NILP (*wait_for_cell
))
2038 /* If we think we have keyboard input waiting, but didn't get SIGIO
2039 go read it. This can happen with X on BSD after logging out.
2040 In that case, there really is no input and no SIGIO,
2041 but select says there is input. */
2043 if (XINT (read_kbd
) && interrupt_input
2044 && (FD_ISSET (keyboard_descriptor
, &Available
)))
2049 got_some_input
|= nfds
> 0;
2051 /* If checking input just got us a size-change event from X,
2052 obey it now if we should. */
2053 if (XINT (read_kbd
) || wait_for_cell
)
2054 do_pending_window_change ();
2056 /* Check for data from a process. */
2057 /* Really FIRST_PROC_DESC should be 0 on Unix,
2058 but this is safer in the short run. */
2059 for (channel
= keyboard_descriptor
== 0 ? FIRST_PROC_DESC
: 0;
2060 channel
<= max_process_desc
; channel
++)
2062 if (FD_ISSET (channel
, &Available
))
2066 /* If waiting for this channel, arrange to return as
2067 soon as no more input to be processed. No more
2069 if (wait_channel
== channel
)
2075 proc
= chan_process
[channel
];
2079 /* Read data from the process, starting with our
2080 buffered-ahead character if we have one. */
2082 nread
= read_process_output (proc
, channel
);
2085 /* Since read_process_output can run a filter,
2086 which can call accept-process-output,
2087 don't try to read from any other processes
2088 before doing the select again. */
2089 FD_ZERO (&Available
);
2092 redisplay_preserve_echo_area ();
2095 else if (nread
== -1 && errno
== EWOULDBLOCK
)
2099 else if (nread
== -1 && errno
== EAGAIN
)
2103 else if (nread
== -1 && errno
== EAGAIN
)
2105 /* Note that we cannot distinguish between no input
2106 available now and a closed pipe.
2107 With luck, a closed pipe will be accompanied by
2108 subprocess termination and SIGCHLD. */
2109 else if (nread
== 0 && !NETCONN_P (proc
))
2111 #endif /* O_NDELAY */
2112 #endif /* O_NONBLOCK */
2113 #endif /* EWOULDBLOCK */
2115 /* On some OSs with ptys, when the process on one end of
2116 a pty exits, the other end gets an error reading with
2117 errno = EIO instead of getting an EOF (0 bytes read).
2118 Therefore, if we get an error reading and errno =
2119 EIO, just continue, because the child process has
2120 exited and should clean itself up soon (e.g. when we
2122 else if (nread
== -1 && errno
== EIO
)
2124 #endif /* HAVE_PTYS */
2125 /* If we can detect process termination, don't consider the process
2126 gone just because its pipe is closed. */
2128 else if (nread
== 0 && !NETCONN_P (proc
))
2133 /* Preserve status of processes already terminated. */
2134 XSETINT (XPROCESS (proc
)->tick
, ++process_tick
);
2135 deactivate_process (proc
);
2136 if (!NILP (XPROCESS (proc
)->raw_status_low
))
2137 update_status (XPROCESS (proc
));
2138 if (EQ (XPROCESS (proc
)->status
, Qrun
))
2139 XPROCESS (proc
)->status
2140 = Fcons (Qexit
, Fcons (make_number (256), Qnil
));
2143 } /* end for each file descriptor */
2144 } /* end while exit conditions not met */
2146 /* If calling from keyboard input, do not quit
2147 since we want to return C-g as an input character.
2148 Otherwise, do pending quit if requested. */
2149 if (XINT (read_kbd
) >= 0)
2151 /* Prevent input_pending from remaining set if we quit. */
2152 clear_input_pending ();
2156 return got_some_input
;
2159 /* Read pending output from the process channel,
2160 starting with our buffered-ahead character if we have one.
2161 Yield number of characters read.
2163 This function reads at most 1024 characters.
2164 If you want to read all available subprocess output,
2165 you must call it repeatedly until it returns zero. */
2167 read_process_output (proc
, channel
)
2169 register int channel
;
2171 register int nchars
;
2177 register Lisp_Object outstream
;
2178 register struct buffer
*old
= current_buffer
;
2179 register struct Lisp_Process
*p
= XPROCESS (proc
);
2180 register int opoint
;
2183 VMS_PROC_STUFF
*vs
, *get_vms_process_pointer();
2185 vs
= get_vms_process_pointer (p
->pid
);
2189 return(0); /* Really weird if it does this */
2190 if (!(vs
->iosb
[0] & 1))
2191 return -1; /* I/O error */
2194 error ("Could not get VMS process pointer");
2195 chars
= vs
->inputBuffer
;
2196 nchars
= clean_vms_buffer (chars
, vs
->iosb
[1]);
2199 start_vms_process_read (vs
); /* Crank up the next read on the process */
2200 return 1; /* Nothing worth printing, say we got 1 */
2204 if (proc_buffered_char
[channel
] < 0)
2205 nchars
= read (channel
, chars
, sizeof chars
);
2208 chars
[0] = proc_buffered_char
[channel
];
2209 proc_buffered_char
[channel
] = -1;
2210 nchars
= read (channel
, chars
+ 1, sizeof chars
- 1);
2214 nchars
= nchars
+ 1;
2216 #endif /* not VMS */
2218 if (nchars
<= 0) return nchars
;
2220 outstream
= p
->filter
;
2221 if (!NILP (outstream
))
2223 /* We inhibit quit here instead of just catching it so that
2224 hitting ^G when a filter happens to be running won't screw
2226 int count
= specpdl_ptr
- specpdl
;
2227 Lisp_Object odeactivate
;
2228 Lisp_Object obuffer
;
2230 odeactivate
= Vdeactivate_mark
;
2231 obuffer
= Fcurrent_buffer ();
2233 specbind (Qinhibit_quit
, Qt
);
2234 call2 (outstream
, proc
, make_string (chars
, nchars
));
2236 /* Handling the process output should not deactivate the mark. */
2237 Vdeactivate_mark
= odeactivate
;
2239 if (! EQ (Fcurrent_buffer (), obuffer
))
2240 record_asynch_buffer_change ();
2242 if (waiting_for_user_input_p
)
2243 prepare_menu_bars ();
2246 start_vms_process_read (vs
);
2248 unbind_to (count
, Qnil
);
2252 /* If no filter, write into buffer if it isn't dead. */
2253 if (!NILP (p
->buffer
) && !NILP (XBUFFER (p
->buffer
)->name
))
2255 Lisp_Object old_read_only
;
2256 Lisp_Object old_begv
, old_zv
;
2257 Lisp_Object odeactivate
;
2259 odeactivate
= Vdeactivate_mark
;
2261 Fset_buffer (p
->buffer
);
2263 old_read_only
= current_buffer
->read_only
;
2264 XFASTINT (old_begv
) = BEGV
;
2265 XFASTINT (old_zv
) = ZV
;
2267 current_buffer
->read_only
= Qnil
;
2269 /* Insert new output into buffer
2270 at the current end-of-output marker,
2271 thus preserving logical ordering of input and output. */
2272 if (XMARKER (p
->mark
)->buffer
)
2273 SET_PT (clip_to_bounds (BEGV
, marker_position (p
->mark
), ZV
));
2277 /* If the output marker is outside of the visible region, save
2278 the restriction and widen. */
2279 if (! (BEGV
<= point
&& point
<= ZV
))
2282 /* Make sure opoint floats ahead of any new text, just as point
2284 if (point
<= opoint
)
2287 /* Insert after old_begv, but before old_zv. */
2288 if (point
< XFASTINT (old_begv
))
2289 XFASTINT (old_begv
) += nchars
;
2290 if (point
<= XFASTINT (old_zv
))
2291 XFASTINT (old_zv
) += nchars
;
2293 /* Insert before markers in case we are inserting where
2294 the buffer's mark is, and the user's next command is Meta-y. */
2295 insert_before_markers (chars
, nchars
);
2296 Fset_marker (p
->mark
, make_number (point
), p
->buffer
);
2298 update_mode_lines
++;
2300 /* If the restriction isn't what it should be, set it. */
2301 if (XFASTINT (old_begv
) != BEGV
|| XFASTINT (old_zv
) != ZV
)
2302 Fnarrow_to_region (old_begv
, old_zv
);
2304 /* Handling the process output should not deactivate the mark. */
2305 Vdeactivate_mark
= odeactivate
;
2307 current_buffer
->read_only
= old_read_only
;
2309 set_buffer_internal (old
);
2312 start_vms_process_read (vs
);
2317 DEFUN ("waiting-for-user-input-p", Fwaiting_for_user_input_p
, Swaiting_for_user_input_p
,
2319 "Returns non-nil if emacs is waiting for input from the user.\n\
2320 This is intended for use by asynchronous process output filters and sentinels.")
2323 return (waiting_for_user_input_p
? Qt
: Qnil
);
2326 /* Sending data to subprocess */
2328 jmp_buf send_process_frame
;
2331 send_process_trap ()
2337 longjmp (send_process_frame
, 1);
2340 /* Send some data to process PROC.
2341 BUF is the beginning of the data; LEN is the number of characters.
2342 OBJECT is the Lisp object that the data comes from. */
2344 send_process (proc
, buf
, len
, object
)
2350 /* Don't use register vars; longjmp can lose them. */
2352 unsigned char *procname
= XSTRING (XPROCESS (proc
)->name
)->data
;
2355 struct Lisp_Process
*p
= XPROCESS (proc
);
2356 VMS_PROC_STUFF
*vs
, *get_vms_process_pointer();
2359 if (! NILP (XPROCESS (proc
)->raw_status_low
))
2360 update_status (XPROCESS (proc
));
2361 if (! EQ (XPROCESS (proc
)->status
, Qrun
))
2362 error ("Process %s not running", procname
);
2365 vs
= get_vms_process_pointer (p
->pid
);
2367 error ("Could not find this process: %x", p
->pid
);
2368 else if (write_to_vms_process (vs
, buf
, len
))
2372 if (pty_max_bytes
== 0)
2374 #if defined (HAVE_FPATHCONF) && defined (_PC_MAX_CANON)
2375 pty_max_bytes
= fpathconf (XFASTINT (XPROCESS (proc
)->outfd
),
2377 if (pty_max_bytes
< 0)
2378 pty_max_bytes
= 250;
2380 pty_max_bytes
= 250;
2382 /* Deduct one, to leave space for the eof. */
2386 if (!setjmp (send_process_frame
))
2390 SIGTYPE (*old_sigpipe
)();
2393 /* Decide how much data we can send in one batch.
2394 Long lines need to be split into multiple batches. */
2395 if (!NILP (XPROCESS (proc
)->pty_flag
))
2397 /* Starting this at zero is always correct when not the first iteration
2398 because the previous iteration ended by sending C-d.
2399 It may not be correct for the first iteration
2400 if a partial line was sent in a separate send_process call.
2401 If that proves worth handling, we need to save linepos
2402 in the process object. */
2405 char *end
= buf
+ len
;
2407 /* Scan through this text for a line that is too long. */
2408 while (ptr
!= end
&& linepos
< pty_max_bytes
)
2416 /* If we found one, break the line there
2417 and put in a C-d to force the buffer through. */
2421 /* Send this batch, using one or more write calls. */
2424 old_sigpipe
= (SIGTYPE (*) ()) signal (SIGPIPE
, send_process_trap
);
2425 rv
= write (XINT (XPROCESS (proc
)->outfd
), buf
, this);
2426 signal (SIGPIPE
, old_sigpipe
);
2432 || errno
== EWOULDBLOCK
2438 /* Buffer is full. Wait, accepting input;
2439 that may allow the program
2440 to finish doing output and read more. */
2445 /* Running filters might relocate buffers or strings.
2446 Arrange to relocate BUF. */
2447 if (BUFFERP (object
))
2448 offset
= BUF_PTR_CHAR_POS (XBUFFER (object
),
2449 (unsigned char *) buf
);
2450 else if (STRINGP (object
))
2451 offset
= buf
- (char *) XSTRING (object
)->data
;
2453 XFASTINT (zero
) = 0;
2454 wait_reading_process_input (1, 0, zero
, 0);
2456 if (BUFFERP (object
))
2457 buf
= (char *) BUF_CHAR_ADDRESS (XBUFFER (object
), offset
);
2458 else if (STRINGP (object
))
2459 buf
= offset
+ (char *) XSTRING (object
)->data
;
2464 /* This is a real error. */
2465 report_file_error ("writing to process", Fcons (proc
, Qnil
));
2472 /* If we sent just part of the string, put in an EOF
2473 to force it through, before we send the rest. */
2475 Fprocess_send_eof (proc
);
2480 XPROCESS (proc
)->raw_status_low
= Qnil
;
2481 XPROCESS (proc
)->raw_status_high
= Qnil
;
2482 XPROCESS (proc
)->status
= Fcons (Qexit
, Fcons (make_number (256), Qnil
));
2483 XSETINT (XPROCESS (proc
)->tick
, ++process_tick
);
2484 deactivate_process (proc
);
2486 error ("Error writing to process %s; closed it", procname
);
2488 error ("SIGPIPE raised on process %s; closed it", procname
);
2493 DEFUN ("process-send-region", Fprocess_send_region
, Sprocess_send_region
,
2495 "Send current contents of region as input to PROCESS.\n\
2496 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
2497 nil, indicating the current buffer's process.\n\
2498 Called from program, takes three arguments, PROCESS, START and END.\n\
2499 If the region is more than 500 characters long,\n\
2500 it is sent in several bunches. This may happen even for shorter regions.\n\
2501 Output from processes can arrive in between bunches.")
2502 (process
, start
, end
)
2503 Lisp_Object process
, start
, end
;
2508 proc
= get_process (process
);
2509 validate_region (&start
, &end
);
2511 if (XINT (start
) < GPT
&& XINT (end
) > GPT
)
2514 start1
= XINT (start
);
2515 send_process (proc
, &FETCH_CHAR (start1
), XINT (end
) - XINT (start
),
2516 Fcurrent_buffer ());
2521 DEFUN ("process-send-string", Fprocess_send_string
, Sprocess_send_string
,
2523 "Send PROCESS the contents of STRING as input.\n\
2524 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
2525 nil, indicating the current buffer's process.\n\
2526 If STRING is more than 500 characters long,\n\
2527 it is sent in several bunches. This may happen even for shorter strings.\n\
2528 Output from processes can arrive in between bunches.")
2530 Lisp_Object process
, string
;
2533 CHECK_STRING (string
, 1);
2534 proc
= get_process (process
);
2535 send_process (proc
, XSTRING (string
)->data
, XSTRING (string
)->size
, string
);
2539 /* send a signal number SIGNO to PROCESS.
2540 CURRENT_GROUP means send to the process group that currently owns
2541 the terminal being used to communicate with PROCESS.
2542 This is used for various commands in shell mode.
2543 If NOMSG is zero, insert signal-announcements into process's buffers
2546 If we can, we try to signal PROCESS by sending control characters
2547 down the pty. This allows us to signal inferiors who have changed
2548 their uid, for which killpg would return an EPERM error. */
2551 process_send_signal (process
, signo
, current_group
, nomsg
)
2552 Lisp_Object process
;
2554 Lisp_Object current_group
;
2558 register struct Lisp_Process
*p
;
2562 proc
= get_process (process
);
2563 p
= XPROCESS (proc
);
2565 if (!EQ (p
->childp
, Qt
))
2566 error ("Process %s is not a subprocess",
2567 XSTRING (p
->name
)->data
);
2568 if (XINT (p
->infd
) < 0)
2569 error ("Process %s is not active",
2570 XSTRING (p
->name
)->data
);
2572 if (NILP (p
->pty_flag
))
2573 current_group
= Qnil
;
2575 /* If we are using pgrps, get a pgrp number and make it negative. */
2576 if (!NILP (current_group
))
2578 #ifdef SIGNALS_VIA_CHARACTERS
2579 /* If possible, send signals to the entire pgrp
2580 by sending an input character to it. */
2582 /* TERMIOS is the latest and bestest, and seems most likely to
2583 work. If the system has it, use it. */
2590 tcgetattr (XINT (p
->infd
), &t
);
2591 send_process (proc
, &t
.c_cc
[VINTR
], 1, Qnil
);
2595 tcgetattr (XINT (p
->infd
), &t
);
2596 send_process (proc
, &t
.c_cc
[VQUIT
], 1, Qnil
);
2600 tcgetattr (XINT (p
->infd
), &t
);
2601 #if defined (VSWTCH) && !defined (PREFER_VSUSP)
2602 send_process (proc
, &t
.c_cc
[VSWTCH
], 1, Qnil
);
2604 send_process (proc
, &t
.c_cc
[VSUSP
], 1, Qnil
);
2609 #else /* ! HAVE_TERMIOS */
2611 /* On Berkeley descendants, the following IOCTL's retrieve the
2612 current control characters. */
2613 #if defined (TIOCGLTC) && defined (TIOCGETC)
2621 ioctl (XINT (p
->infd
), TIOCGETC
, &c
);
2622 send_process (proc
, &c
.t_intrc
, 1, Qnil
);
2625 ioctl (XINT (p
->infd
), TIOCGETC
, &c
);
2626 send_process (proc
, &c
.t_quitc
, 1, Qnil
);
2630 ioctl (XINT (p
->infd
), TIOCGLTC
, &lc
);
2631 send_process (proc
, &lc
.t_suspc
, 1, Qnil
);
2633 #endif /* ! defined (SIGTSTP) */
2636 #else /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
2638 /* On SYSV descendants, the TCGETA ioctl retrieves the current control
2645 ioctl (XINT (p
->infd
), TCGETA
, &t
);
2646 send_process (proc
, &t
.c_cc
[VINTR
], 1, Qnil
);
2649 ioctl (XINT (p
->infd
), TCGETA
, &t
);
2650 send_process (proc
, &t
.c_cc
[VQUIT
], 1, Qnil
);
2654 ioctl (XINT (p
->infd
), TCGETA
, &t
);
2655 send_process (proc
, &t
.c_cc
[VSWTCH
], 1, Qnil
);
2657 #endif /* ! defined (SIGTSTP) */
2659 #else /* ! defined (TCGETA) */
2660 Your configuration files are messed up
.
2661 /* If your system configuration files define SIGNALS_VIA_CHARACTERS,
2662 you'd better be using one of the alternatives above! */
2663 #endif /* ! defined (TCGETA) */
2664 #endif /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
2665 #endif /* ! defined HAVE_TERMIOS */
2666 #endif /* ! defined (SIGNALS_VIA_CHARACTERS) */
2669 /* Get the pgrp using the tty itself, if we have that.
2670 Otherwise, use the pty to get the pgrp.
2671 On pfa systems, saka@pfu.fujitsu.co.JP writes:
2672 "TIOCGPGRP symbol defined in sys/ioctl.h at E50.
2673 But, TIOCGPGRP does not work on E50 ;-P works fine on E60"
2674 His patch indicates that if TIOCGPGRP returns an error, then
2675 we should just assume that p->pid is also the process group id. */
2679 if (!NILP (p
->subtty
))
2680 err
= ioctl (XFASTINT (p
->subtty
), TIOCGPGRP
, &gid
);
2682 err
= ioctl (XINT (p
->infd
), TIOCGPGRP
, &gid
);
2686 gid
= - XFASTINT (p
->pid
);
2687 #endif /* ! defined (pfa) */
2693 #else /* ! defined (TIOCGPGRP ) */
2694 /* Can't select pgrps on this system, so we know that
2695 the child itself heads the pgrp. */
2696 gid
= - XFASTINT (p
->pid
);
2697 #endif /* ! defined (TIOCGPGRP ) */
2700 gid
= - XFASTINT (p
->pid
);
2706 p
->raw_status_low
= Qnil
;
2707 p
->raw_status_high
= Qnil
;
2709 XSETINT (p
->tick
, ++process_tick
);
2713 #endif /* ! defined (SIGCONT) */
2716 send_process (proc
, "\003", 1, Qnil
); /* ^C */
2721 send_process (proc
, "\031", 1, Qnil
); /* ^Y */
2726 sys$
forcex (&(XFASTINT (p
->pid
)), 0, 1);
2729 flush_pending_output (XINT (p
->infd
));
2733 /* If we don't have process groups, send the signal to the immediate
2734 subprocess. That isn't really right, but it's better than any
2735 obvious alternative. */
2738 kill (XFASTINT (p
->pid
), signo
);
2742 /* gid may be a pid, or minus a pgrp's number */
2744 if (!NILP (current_group
))
2745 ioctl (XINT (p
->infd
), TIOCSIGSEND
, signo
);
2748 gid
= - XFASTINT (p
->pid
);
2751 #else /* ! defined (TIOCSIGSEND) */
2752 EMACS_KILLPG (-gid
, signo
);
2753 #endif /* ! defined (TIOCSIGSEND) */
2756 DEFUN ("interrupt-process", Finterrupt_process
, Sinterrupt_process
, 0, 2, 0,
2757 "Interrupt process PROCESS. May be process or name of one.\n\
2758 PROCESS may be a process, a buffer, or the name of a process or buffer.\n\
2759 nil or no arg means current buffer's process.\n\
2760 Second arg CURRENT-GROUP non-nil means send signal to\n\
2761 the current process-group of the process's controlling terminal\n\
2762 rather than to the process's own process group.\n\
2763 If the process is a shell, this means interrupt current subjob\n\
2764 rather than the shell.")
2765 (process
, current_group
)
2766 Lisp_Object process
, current_group
;
2768 process_send_signal (process
, SIGINT
, current_group
, 0);
2772 DEFUN ("kill-process", Fkill_process
, Skill_process
, 0, 2, 0,
2773 "Kill process PROCESS. May be process or name of one.\n\
2774 See function `interrupt-process' for more details on usage.")
2775 (process
, current_group
)
2776 Lisp_Object process
, current_group
;
2778 process_send_signal (process
, SIGKILL
, current_group
, 0);
2782 DEFUN ("quit-process", Fquit_process
, Squit_process
, 0, 2, 0,
2783 "Send QUIT signal to process PROCESS. May be process or name of one.\n\
2784 See function `interrupt-process' for more details on usage.")
2785 (process
, current_group
)
2786 Lisp_Object process
, current_group
;
2788 process_send_signal (process
, SIGQUIT
, current_group
, 0);
2792 DEFUN ("stop-process", Fstop_process
, Sstop_process
, 0, 2, 0,
2793 "Stop process PROCESS. May be process or name of one.\n\
2794 See function `interrupt-process' for more details on usage.")
2795 (process
, current_group
)
2796 Lisp_Object process
, current_group
;
2799 error ("no SIGTSTP support");
2801 process_send_signal (process
, SIGTSTP
, current_group
, 0);
2806 DEFUN ("continue-process", Fcontinue_process
, Scontinue_process
, 0, 2, 0,
2807 "Continue process PROCESS. May be process or name of one.\n\
2808 See function `interrupt-process' for more details on usage.")
2809 (process
, current_group
)
2810 Lisp_Object process
, current_group
;
2813 process_send_signal (process
, SIGCONT
, current_group
, 0);
2815 error ("no SIGCONT support");
2820 DEFUN ("signal-process", Fsignal_process
, Ssignal_process
,
2821 2, 2, "nProcess number: \nnSignal code: ",
2822 "Send the process with number PID the signal with code CODE.\n\
2823 Both PID and CODE are integers.")
2825 Lisp_Object pid
, sig
;
2827 CHECK_NUMBER (pid
, 0);
2828 CHECK_NUMBER (sig
, 1);
2829 return make_number (kill (XINT (pid
), XINT (sig
)));
2832 DEFUN ("process-send-eof", Fprocess_send_eof
, Sprocess_send_eof
, 0, 1, 0,
2833 "Make PROCESS see end-of-file in its input.\n\
2834 Eof comes after any text already sent to it.\n\
2835 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
2836 nil, indicating the current buffer's process.\n\
2837 If PROCESS is a network connection, or is a process communicating\n\
2838 through a pipe (as opposed to a pty), then you cannot send any more\n\
2839 text to PROCESS after you call this function.")
2841 Lisp_Object process
;
2845 proc
= get_process (process
);
2847 /* Make sure the process is really alive. */
2848 if (! NILP (XPROCESS (proc
)->raw_status_low
))
2849 update_status (XPROCESS (proc
));
2850 if (! EQ (XPROCESS (proc
)->status
, Qrun
))
2851 error ("Process %s not running", XSTRING (XPROCESS (proc
)->name
)->data
);
2853 /* Sending a zero-length record is supposed to mean eof
2854 when TIOCREMOTE is turned on. */
2858 write (XINT (XPROCESS (proc
)->outfd
), buf
, 0);
2860 #else /* did not do TOICREMOTE */
2862 send_process (proc
, "\032", 1, Qnil
); /* ^z */
2864 if (!NILP (XPROCESS (proc
)->pty_flag
))
2865 send_process (proc
, "\004", 1, Qnil
);
2868 close (XINT (XPROCESS (proc
)->outfd
));
2869 XSET (XPROCESS (proc
)->outfd
, Lisp_Int
, open (NULL_DEVICE
, O_WRONLY
));
2872 #endif /* did not do TOICREMOTE */
2876 /* Kill all processes associated with `buffer'.
2877 If `buffer' is nil, kill all processes */
2879 kill_buffer_processes (buffer
)
2882 Lisp_Object tail
, proc
;
2884 for (tail
= Vprocess_alist
; XGCTYPE (tail
) == Lisp_Cons
;
2885 tail
= XCONS (tail
)->cdr
)
2887 proc
= XCONS (XCONS (tail
)->car
)->cdr
;
2888 if (XGCTYPE (proc
) == Lisp_Process
2889 && (NILP (buffer
) || EQ (XPROCESS (proc
)->buffer
, buffer
)))
2891 if (NETCONN_P (proc
))
2892 Fdelete_process (proc
);
2893 else if (XINT (XPROCESS (proc
)->infd
) >= 0)
2894 process_send_signal (proc
, SIGHUP
, Qnil
, 1);
2899 /* On receipt of a signal that a child status has changed,
2900 loop asking about children with changed statuses until
2901 the system says there are no more.
2902 All we do is change the status;
2903 we do not run sentinels or print notifications.
2904 That is saved for the next time keyboard input is done,
2905 in order to avoid timing errors. */
2907 /** WARNING: this can be called during garbage collection.
2908 Therefore, it must not be fooled by the presence of mark bits in
2911 /** USG WARNING: Although it is not obvious from the documentation
2912 in signal(2), on a USG system the SIGCLD handler MUST NOT call
2913 signal() before executing at least one wait(), otherwise the handler
2914 will be called again, resulting in an infinite loop. The relevant
2915 portion of the documentation reads "SIGCLD signals will be queued
2916 and the signal-catching function will be continually reentered until
2917 the queue is empty". Invoking signal() causes the kernel to reexamine
2918 the SIGCLD queue. Fred Fish, UniSoft Systems Inc. */
2921 sigchld_handler (signo
)
2924 int old_errno
= errno
;
2926 register struct Lisp_Process
*p
;
2927 extern EMACS_TIME
*input_available_clear_time
;
2931 sigheld
|= sigbit (SIGCHLD
);
2943 #endif /* no WUNTRACED */
2944 /* Keep trying to get a status until we get a definitive result. */
2948 pid
= wait3 (&w
, WNOHANG
| WUNTRACED
, 0);
2950 while (pid
<= 0 && errno
== EINTR
);
2954 /* A real failure. We have done all our job, so return. */
2956 /* USG systems forget handlers when they are used;
2957 must reestablish each time */
2959 signal (signo
, sigchld_handler
); /* WARNING - must come after wait3() */
2962 sigheld
&= ~sigbit (SIGCHLD
);
2970 #endif /* no WNOHANG */
2972 /* Find the process that signaled us, and record its status. */
2975 for (tail
= Vprocess_alist
; XSYMBOL (tail
) != XSYMBOL (Qnil
); tail
= XCONS (tail
)->cdr
)
2977 proc
= XCONS (XCONS (tail
)->car
)->cdr
;
2978 p
= XPROCESS (proc
);
2979 if (EQ (p
->childp
, Qt
) && XFASTINT (p
->pid
) == pid
)
2984 /* Look for an asynchronous process whose pid hasn't been filled
2987 for (tail
= Vprocess_alist
; XSYMBOL (tail
) != XSYMBOL (Qnil
); tail
= XCONS (tail
)->cdr
)
2989 proc
= XCONS (XCONS (tail
)->car
)->cdr
;
2990 p
= XPROCESS (proc
);
2991 if (XTYPE (p
->pid
) == Lisp_Int
&& XINT (p
->pid
) == -1)
2996 /* Change the status of the process that was found. */
2999 union { int i
; WAITTYPE wt
; } u
;
3001 XSETINT (p
->tick
, ++process_tick
);
3003 XFASTINT (p
->raw_status_low
) = u
.i
& 0xffff;
3004 XFASTINT (p
->raw_status_high
) = u
.i
>> 16;
3006 /* If process has terminated, stop waiting for its output. */
3007 if (WIFSIGNALED (w
) || WIFEXITED (w
))
3008 if (XINT (p
->infd
) >= 0)
3009 FD_CLR (XINT (p
->infd
), &input_wait_mask
);
3011 /* Tell wait_reading_process_input that it needs to wake up and
3013 if (input_available_clear_time
)
3014 EMACS_SET_SECS_USECS (*input_available_clear_time
, 0, 0);
3017 /* There was no asynchronous process found for that id. Check
3018 if we have a synchronous process. */
3021 synch_process_alive
= 0;
3023 /* Report the status of the synchronous process. */
3025 synch_process_retcode
= WRETCODE (w
);
3026 else if (WIFSIGNALED (w
))
3028 int code
= WTERMSIG (w
);
3034 signame
= sys_siglist
[code
];
3036 signame
= sys_errlist
[code
];
3040 signame
= "unknown";
3042 synch_process_death
= signame
;
3045 /* Tell wait_reading_process_input that it needs to wake up and
3047 if (input_available_clear_time
)
3048 EMACS_SET_SECS_USECS (*input_available_clear_time
, 0, 0);
3051 /* On some systems, we must return right away.
3052 If any more processes want to signal us, we will
3054 Otherwise (on systems that have WNOHANG), loop around
3055 to use up all the processes that have something to tell us. */
3056 #if defined (USG) && ! (defined (HPUX) && defined (WNOHANG))
3058 signal (signo
, sigchld_handler
);
3062 #endif /* USG, but not HPUX with WNOHANG */
3068 exec_sentinel_unwind (data
)
3071 XPROCESS (XCONS (data
)->car
)->sentinel
= XCONS (data
)->cdr
;
3076 exec_sentinel (proc
, reason
)
3077 Lisp_Object proc
, reason
;
3079 Lisp_Object sentinel
, obuffer
, odeactivate
;
3080 register struct Lisp_Process
*p
= XPROCESS (proc
);
3081 int count
= specpdl_ptr
- specpdl
;
3083 odeactivate
= Vdeactivate_mark
;
3084 obuffer
= Fcurrent_buffer ();
3085 sentinel
= p
->sentinel
;
3086 if (NILP (sentinel
))
3089 /* Zilch the sentinel while it's running, to avoid recursive invocations;
3090 assure that it gets restored no matter how the sentinel exits. */
3092 record_unwind_protect (exec_sentinel_unwind
, Fcons (proc
, sentinel
));
3093 /* Inhibit quit so that random quits don't screw up a running filter. */
3094 specbind (Qinhibit_quit
, Qt
);
3095 call2 (sentinel
, proc
, reason
);
3097 Vdeactivate_mark
= odeactivate
;
3098 if (! EQ (Fcurrent_buffer (), obuffer
))
3099 record_asynch_buffer_change ();
3101 if (waiting_for_user_input_p
)
3102 prepare_menu_bars ();
3103 unbind_to (count
, Qnil
);
3106 /* Report all recent events of a change in process status
3107 (either run the sentinel or output a message).
3108 This is done while Emacs is waiting for keyboard input. */
3112 register Lisp_Object proc
, buffer
;
3113 Lisp_Object tail
, msg
;
3114 struct gcpro gcpro1
, gcpro2
;
3118 /* We need to gcpro tail; if read_process_output calls a filter
3119 which deletes a process and removes the cons to which tail points
3120 from Vprocess_alist, and then causes a GC, tail is an unprotected
3124 for (tail
= Vprocess_alist
; !NILP (tail
); tail
= Fcdr (tail
))
3127 register struct Lisp_Process
*p
;
3129 proc
= Fcdr (Fcar (tail
));
3130 p
= XPROCESS (proc
);
3132 if (XINT (p
->tick
) != XINT (p
->update_tick
))
3134 XSETINT (p
->update_tick
, XINT (p
->tick
));
3136 /* If process is still active, read any output that remains. */
3137 if (XINT (p
->infd
) >= 0)
3138 while (! EQ (p
->filter
, Qt
)
3139 && read_process_output (proc
, XINT (p
->infd
)) > 0);
3143 /* Get the text to use for the message. */
3144 if (!NILP (p
->raw_status_low
))
3146 msg
= status_message (p
->status
);
3148 /* If process is terminated, deactivate it or delete it. */
3150 if (XTYPE (p
->status
) == Lisp_Cons
)
3151 symbol
= XCONS (p
->status
)->car
;
3153 if (EQ (symbol
, Qsignal
) || EQ (symbol
, Qexit
)
3154 || EQ (symbol
, Qclosed
))
3156 if (delete_exited_processes
)
3157 remove_process (proc
);
3159 deactivate_process (proc
);
3162 /* Now output the message suitably. */
3163 if (!NILP (p
->sentinel
))
3164 exec_sentinel (proc
, msg
);
3165 /* Don't bother with a message in the buffer
3166 when a process becomes runnable. */
3167 else if (!EQ (symbol
, Qrun
) && !NILP (buffer
))
3169 Lisp_Object ro
, tem
;
3170 struct buffer
*old
= current_buffer
;
3173 ro
= XBUFFER (buffer
)->read_only
;
3175 /* Avoid error if buffer is deleted
3176 (probably that's why the process is dead, too) */
3177 if (NILP (XBUFFER (buffer
)->name
))
3179 Fset_buffer (buffer
);
3181 /* Insert new output into buffer
3182 at the current end-of-output marker,
3183 thus preserving logical ordering of input and output. */
3184 if (XMARKER (p
->mark
)->buffer
)
3185 SET_PT (marker_position (p
->mark
));
3188 if (point
<= opoint
)
3189 opoint
+= XSTRING (msg
)->size
+ XSTRING (p
->name
)->size
+ 10;
3191 tem
= current_buffer
->read_only
;
3192 current_buffer
->read_only
= Qnil
;
3193 insert_string ("\nProcess ");
3194 Finsert (1, &p
->name
);
3195 insert_string (" ");
3197 current_buffer
->read_only
= tem
;
3198 Fset_marker (p
->mark
, make_number (point
), p
->buffer
);
3201 set_buffer_internal (old
);
3206 update_mode_lines
++; /* in case buffers use %s in mode-line-format */
3207 redisplay_preserve_echo_area ();
3209 update_tick
= process_tick
;
3220 if (! noninteractive
|| initialized
)
3222 signal (SIGCHLD
, sigchld_handler
);
3225 FD_ZERO (&input_wait_mask
);
3226 max_process_desc
= 0;
3228 keyboard_descriptor
= 0;
3229 FD_SET (keyboard_descriptor
, &input_wait_mask
);
3231 Vprocess_alist
= Qnil
;
3232 for (i
= 0; i
< MAXDESC
; i
++)
3234 chan_process
[i
] = Qnil
;
3235 proc_buffered_char
[i
] = -1;
3239 /* From now on, assume keyboard input comes from descriptor DESC. */
3242 change_keyboard_wait_descriptor (desc
)
3245 FD_CLR (keyboard_descriptor
, &input_wait_mask
);
3246 keyboard_descriptor
= desc
;
3247 FD_SET (keyboard_descriptor
, &input_wait_mask
);
3253 stream_process
= intern ("stream");
3255 Qprocessp
= intern ("processp");
3256 staticpro (&Qprocessp
);
3257 Qrun
= intern ("run");
3259 Qstop
= intern ("stop");
3261 Qsignal
= intern ("signal");
3262 staticpro (&Qsignal
);
3264 /* Qexit is already staticpro'd by syms_of_eval; don't staticpro it
3267 Qexit = intern ("exit");
3268 staticpro (&Qexit); */
3270 Qopen
= intern ("open");
3272 Qclosed
= intern ("closed");
3273 staticpro (&Qclosed
);
3275 staticpro (&Vprocess_alist
);
3277 DEFVAR_BOOL ("delete-exited-processes", &delete_exited_processes
,
3278 "*Non-nil means delete processes immediately when they exit.\n\
3279 nil means don't delete them until `list-processes' is run.");
3281 delete_exited_processes
= 1;
3283 DEFVAR_LISP ("process-connection-type", &Vprocess_connection_type
,
3284 "Control type of device used to communicate with subprocesses.\n\
3285 Values are nil to use a pipe, or t or `pty' to use a pty.\n\
3286 The value has no effect if the system has no ptys or if all ptys are busy:\n\
3287 then a pipe is used in any case.\n\
3288 The value takes effect when `start-process' is called.");
3289 Vprocess_connection_type
= Qt
;
3291 defsubr (&Sprocessp
);
3292 defsubr (&Sget_process
);
3293 defsubr (&Sget_buffer_process
);
3294 defsubr (&Sdelete_process
);
3295 defsubr (&Sprocess_status
);
3296 defsubr (&Sprocess_exit_status
);
3297 defsubr (&Sprocess_id
);
3298 defsubr (&Sprocess_name
);
3299 defsubr (&Sprocess_command
);
3300 defsubr (&Sset_process_buffer
);
3301 defsubr (&Sprocess_buffer
);
3302 defsubr (&Sprocess_mark
);
3303 defsubr (&Sset_process_filter
);
3304 defsubr (&Sprocess_filter
);
3305 defsubr (&Sset_process_sentinel
);
3306 defsubr (&Sset_process_window_size
);
3307 defsubr (&Sprocess_sentinel
);
3308 defsubr (&Sprocess_kill_without_query
);
3309 defsubr (&Slist_processes
);
3310 defsubr (&Sprocess_list
);
3311 defsubr (&Sstart_process
);
3313 defsubr (&Sopen_network_stream
);
3314 #endif /* HAVE_SOCKETS */
3315 defsubr (&Saccept_process_output
);
3316 defsubr (&Sprocess_send_region
);
3317 defsubr (&Sprocess_send_string
);
3318 defsubr (&Sinterrupt_process
);
3319 defsubr (&Skill_process
);
3320 defsubr (&Squit_process
);
3321 defsubr (&Sstop_process
);
3322 defsubr (&Scontinue_process
);
3323 defsubr (&Sprocess_send_eof
);
3324 defsubr (&Ssignal_process
);
3325 defsubr (&Swaiting_for_user_input_p
);
3326 /* defsubr (&Sprocess_connection); */
3330 #else /* not subprocesses */
3332 #include <sys/types.h>
3336 #include "systime.h"
3337 #include "termopts.h"
3339 extern int frame_garbaged
;
3342 /* As described above, except assuming that there are no subprocesses:
3344 Wait for timeout to elapse and/or keyboard input to be available.
3347 timeout in seconds, or
3348 zero for no limit, or
3349 -1 means gobble data immediately available but don't wait for any.
3351 read_kbd is a Lisp_Object:
3352 0 to ignore keyboard input, or
3353 1 to return when input is available, or
3354 -1 means caller will actually read the input, so don't throw to
3356 We know that read_kbd will never be a Lisp_Process, since
3357 `subprocesses' isn't defined.
3359 do_display != 0 means redisplay should be done to show subprocess
3360 output that arrives.
3362 Return true iff we received input from any process. */
3365 wait_reading_process_input (time_limit
, microsecs
, read_kbd
, do_display
)
3366 int time_limit
, microsecs
;
3367 Lisp_Object read_kbd
;
3370 EMACS_TIME end_time
, timeout
, *timeout_p
;
3373 /* What does time_limit really mean? */
3374 if (time_limit
|| microsecs
)
3376 /* It's not infinite. */
3377 timeout_p
= &timeout
;
3379 if (time_limit
== -1)
3380 /* In fact, it's zero. */
3381 EMACS_SET_SECS_USECS (timeout
, 0, 0);
3383 EMACS_SET_SECS_USECS (timeout
, time_limit
, microsecs
);
3385 /* How far in the future is that? */
3386 EMACS_GET_TIME (end_time
);
3387 EMACS_ADD_TIME (end_time
, end_time
, timeout
);
3390 /* It's infinite. */
3393 /* This must come before stop_polling. */
3394 prepare_menu_bars ();
3396 /* Turn off periodic alarms (in case they are in use)
3397 because the select emulator uses alarms. */
3404 waitchannels
= XINT (read_kbd
) ? 1 : 0;
3406 /* If calling from keyboard input, do not quit
3407 since we want to return C-g as an input character.
3408 Otherwise, do pending quit if requested. */
3409 if (XINT (read_kbd
) >= 0)
3414 EMACS_GET_TIME (*timeout_p
);
3415 EMACS_SUB_TIME (*timeout_p
, end_time
, *timeout_p
);
3416 if (EMACS_TIME_NEG_P (*timeout_p
))
3420 /* Cause C-g and alarm signals to take immediate action,
3421 and cause input available signals to zero out timeout. */
3422 if (XINT (read_kbd
) < 0)
3423 set_waiting_for_input (&timeout
);
3425 /* If a frame has been newly mapped and needs updating,
3426 reprocess its display stuff. */
3427 if (frame_garbaged
&& do_display
)
3428 redisplay_preserve_echo_area ();
3430 if (XINT (read_kbd
) && detect_input_pending ())
3433 nfds
= select (1, &waitchannels
, 0, 0, timeout_p
);
3435 /* Make C-g and alarm signals set flags again */
3436 clear_waiting_for_input ();
3438 /* If we woke up due to SIGWINCH, actually change size now. */
3439 do_pending_window_change ();
3443 /* If the system call was interrupted, then go around the
3449 else if (nfds
> 0 && (waitchannels
& 1) && interrupt_input
)
3450 /* System sometimes fails to deliver SIGIO. */
3451 kill (getpid (), SIGIO
);
3454 if (XINT (read_kbd
) && interrupt_input
&& (waitchannels
& 1))
3458 /* If we have timed out (nfds == 0) or found some input (nfds > 0),
3470 DEFUN ("get-buffer-process", Fget_buffer_process
, Sget_buffer_process
, 1, 1, 0,
3471 /* Don't confuse make-docfile by having two doc strings for this function.
3472 make-docfile does not pay attention to #if, for good reason! */
3475 register Lisp_Object name
;
3480 /* Kill all processes associated with `buffer'.
3481 If `buffer' is nil, kill all processes.
3482 Since we have no subprocesses, this does nothing. */
3484 kill_buffer_processes (buffer
)
3495 defsubr (&Sget_buffer_process
);
3499 #endif /* not subprocesses */