1 /* Asynchronous subprocess control for GNU Emacs.
2 Copyright (C) 1985, 86, 87, 88, 93, 94 Free Software Foundation, Inc.
4 This file is part of GNU Emacs.
6 GNU Emacs is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU Emacs is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU Emacs; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
25 /* This file is split into two parts by the following preprocessor
26 conditional. The 'then' clause contains all of the support for
27 asynchronous subprocesses. The 'else' clause contains stub
28 versions of some of the asynchronous subprocess routines that are
29 often called elsewhere in Emacs, so we don't have to #ifdef the
30 sections that call them. */
38 #include <sys/types.h> /* some typedefs are used in sys/file.h */
45 #ifdef HAVE_SOCKETS /* TCP connection support, if kernel can do it */
46 #include <sys/socket.h>
48 #include <netinet/in.h>
49 #include <arpa/inet.h>
50 #endif /* HAVE_SOCKETS */
52 /* TERM is a poor-man's SLIP, used on Linux. */
57 /* DGUX inet_addr returns a 'struct in_addr'. */
59 #define IN_ADDR struct in_addr
60 #define NUMERIC_ADDR_ERROR (numeric_addr.s_addr == -1)
62 #define IN_ADDR unsigned long
63 #define NUMERIC_ADDR_ERROR (numeric_addr == -1)
66 #if defined(BSD) || defined(STRIDE)
67 #include <sys/ioctl.h>
68 #if !defined (O_NDELAY) && defined (HAVE_PTYS) && !defined(USG5)
70 #endif /* HAVE_PTYS and no O_NDELAY */
71 #endif /* BSD or STRIDE */
73 #ifdef BROKEN_O_NONBLOCK
75 #endif /* BROKEN_O_NONBLOCK */
82 #include <sys/sysmacros.h> /* for "minor" */
92 #include "termhooks.h"
97 Lisp_Object Qprocessp
;
98 Lisp_Object Qrun
, Qstop
, Qsignal
, Qopen
, Qclosed
;
99 /* Qexit is declared and initialized in eval.c. */
101 /* a process object is a network connection when its childp field is neither
102 Qt nor Qnil but is instead a string (name of foreign host we
103 are connected to + name of port we are connected to) */
106 static Lisp_Object stream_process
;
108 #define NETCONN_P(p) (XGCTYPE (XPROCESS (p)->childp) == Lisp_String)
110 #define NETCONN_P(p) 0
111 #endif /* HAVE_SOCKETS */
113 /* Define first descriptor number available for subprocesses. */
115 #define FIRST_PROC_DESC 1
117 #define FIRST_PROC_DESC 3
120 /* Define SIGCHLD as an alias for SIGCLD. There are many conditionals
123 #if !defined (SIGCHLD) && defined (SIGCLD)
124 #define SIGCHLD SIGCLD
127 #include "syssignal.h"
132 extern char *strerror ();
134 extern char *sys_errlist
[];
137 #ifndef SYS_SIGLIST_DECLARED
141 extern char *sys_siglist
[];
142 #endif /* not LINUX */
144 char *sys_siglist
[] =
150 "illegal instruction",
154 "floating point exception",
157 "segmentation violation",
158 "bad argument to system call",
159 "write on a pipe with no one to read it",
161 "software termination signal from kill",
163 "sendable stop signal not from tty",
164 "stop signal from tty",
165 "continue a stopped process",
166 "child status has changed",
167 "background read attempted from control tty",
168 "background write attempted from control tty",
169 "input record available at control tty",
170 "exceeded CPU time limit",
171 "exceeded file size limit"
175 #endif /* ! SYS_SIGLIST_DECLARED */
177 /* t means use pty, nil means use a pipe,
178 maybe other values to come. */
179 static Lisp_Object Vprocess_connection_type
;
183 #include <sys/socket.h>
187 /* Number of events of change of status of a process. */
188 static int process_tick
;
190 /* Number of events for which the user or sentinel has been notified. */
191 static int update_tick
;
194 /* We could get this from param.h, but better not to depend on finding that.
195 And better not to risk that it might define other symbols used in this
198 #define MAXDESC FD_SETSIZE
202 #define SELECT_TYPE fd_set
203 #else /* no FD_SET */
205 #define SELECT_TYPE int
207 /* Define the macros to access a single-int bitmap of descriptors. */
208 #define FD_SET(n, p) (*(p) |= (1 << (n)))
209 #define FD_CLR(n, p) (*(p) &= ~(1 << (n)))
210 #define FD_ISSET(n, p) (*(p) & (1 << (n)))
211 #define FD_ZERO(p) (*(p) = 0)
212 #endif /* no FD_SET */
214 /* Mask of bits indicating the descriptors that we wait for input on */
216 static SELECT_TYPE input_wait_mask
;
218 /* The largest descriptor currently in use for a process object. */
219 static int max_process_desc
;
221 /* Descriptor to use for keyboard input. */
222 static int keyboard_descriptor
;
224 /* Nonzero means delete a process right away if it exits. */
225 static int delete_exited_processes
;
227 /* Indexed by descriptor, gives the process (if any) for that descriptor */
228 Lisp_Object chan_process
[MAXDESC
];
230 /* Alist of elements (NAME . PROCESS) */
231 Lisp_Object Vprocess_alist
;
233 /* Buffered-ahead input char from process, indexed by channel.
234 -1 means empty (no char is buffered).
235 Used on sys V where the only way to tell if there is any
236 output from the process is to read at least one char.
237 Always -1 on systems that support FIONREAD. */
239 static int proc_buffered_char
[MAXDESC
];
241 static Lisp_Object
get_process ();
243 /* Maximum number of bytes to send to a pty without an eof. */
244 static int pty_max_bytes
;
246 /* Compute the Lisp form of the process status, p->status, from
247 the numeric status that was returned by `wait'. */
249 Lisp_Object
status_convert ();
252 struct Lisp_Process
*p
;
254 union { int i
; WAITTYPE wt
; } u
;
255 u
.i
= XFASTINT (p
->raw_status_low
) + (XFASTINT (p
->raw_status_high
) << 16);
256 p
->status
= status_convert (u
.wt
);
257 p
->raw_status_low
= Qnil
;
258 p
->raw_status_high
= Qnil
;
261 /* Convert a process status word in Unix format to
262 the list that we use internally. */
269 return Fcons (Qstop
, Fcons (make_number (WSTOPSIG (w
)), Qnil
));
270 else if (WIFEXITED (w
))
271 return Fcons (Qexit
, Fcons (make_number (WRETCODE (w
)),
272 WCOREDUMP (w
) ? Qt
: Qnil
));
273 else if (WIFSIGNALED (w
))
274 return Fcons (Qsignal
, Fcons (make_number (WTERMSIG (w
)),
275 WCOREDUMP (w
) ? Qt
: Qnil
));
280 /* Given a status-list, extract the three pieces of information
281 and store them individually through the three pointers. */
284 decode_status (l
, symbol
, code
, coredump
)
292 if (XTYPE (l
) == Lisp_Symbol
)
300 *symbol
= XCONS (l
)->car
;
301 tem
= XCONS (l
)->cdr
;
302 *code
= XFASTINT (XCONS (tem
)->car
);
303 tem
= XCONS (tem
)->cdr
;
304 *coredump
= !NILP (tem
);
308 /* Return a string describing a process status list. */
311 status_message (status
)
316 Lisp_Object string
, string2
;
318 decode_status (status
, &symbol
, &code
, &coredump
);
320 if (EQ (symbol
, Qsignal
) || EQ (symbol
, Qstop
))
326 signame
= sys_siglist
[code
];
328 signame
= sys_errlist
[code
];
333 string
= build_string (signame
);
334 string2
= build_string (coredump
? " (core dumped)\n" : "\n");
335 XSTRING (string
)->data
[0] = DOWNCASE (XSTRING (string
)->data
[0]);
336 return concat2 (string
, string2
);
338 else if (EQ (symbol
, Qexit
))
341 return build_string ("finished\n");
342 string
= Fnumber_to_string (make_number (code
));
343 string2
= build_string (coredump
? " (core dumped)\n" : "\n");
344 return concat2 (build_string ("exited abnormally with code "),
345 concat2 (string
, string2
));
348 return Fcopy_sequence (Fsymbol_name (symbol
));
353 /* Open an available pty, returning a file descriptor.
354 Return -1 on failure.
355 The file name of the terminal corresponding to the pty
356 is left in the variable pty_name. */
367 /* Some systems name their pseudoterminals so that there are gaps in
368 the usual sequence - for example, on HP9000/S700 systems, there
369 are no pseudoterminals with names ending in 'f'. So we wait for
370 three failures in a row before deciding that we've reached the
372 int failed_count
= 0;
377 for (c
= FIRST_PTY_LETTER
; c
<= 'z'; c
++)
378 for (i
= 0; i
< 16; i
++)
381 #ifdef PTY_NAME_SPRINTF
384 sprintf (pty_name
, "/dev/pty%c%x", c
, i
);
385 #endif /* no PTY_NAME_SPRINTF */
389 #else /* no PTY_OPEN */
391 /* Unusual IRIS code */
392 *ptyv
= open ("/dev/ptc", O_RDWR
| O_NDELAY
, 0);
395 if (fstat (fd
, &stb
) < 0)
398 if (stat (pty_name
, &stb
) < 0)
401 if (failed_count
>= 3)
407 fd
= open (pty_name
, O_RDWR
| O_NONBLOCK
, 0);
409 fd
= open (pty_name
, O_RDWR
| O_NDELAY
, 0);
411 #endif /* not IRIS */
412 #endif /* no PTY_OPEN */
416 /* check to make certain that both sides are available
417 this avoids a nasty yet stupid bug in rlogins */
418 #ifdef PTY_TTY_NAME_SPRINTF
421 sprintf (pty_name
, "/dev/tty%c%x", c
, i
);
422 #endif /* no PTY_TTY_NAME_SPRINTF */
424 if (access (pty_name
, 6) != 0)
427 #if !defined(IRIS) && !defined(__sgi)
433 #endif /* not UNIPLUS */
440 #endif /* HAVE_PTYS */
446 register Lisp_Object val
, tem
, name1
;
447 register struct Lisp_Process
*p
;
451 /* size of process structure includes the vector header,
452 so deduct for that. But struct Lisp_Vector includes the first
453 element, thus deducts too much, so add it back. */
454 val
= Fmake_vector (make_number ((sizeof (struct Lisp_Process
)
455 - sizeof (struct Lisp_Vector
)
456 + sizeof (Lisp_Object
))
457 / sizeof (Lisp_Object
)),
459 XSETTYPE (val
, Lisp_Process
);
462 XSET (p
->infd
, Lisp_Int
, -1);
463 XSET (p
->outfd
, Lisp_Int
, -1);
464 XFASTINT (p
->pid
) = 0;
465 XFASTINT (p
->tick
) = 0;
466 XFASTINT (p
->update_tick
) = 0;
467 p
->raw_status_low
= Qnil
;
468 p
->raw_status_high
= Qnil
;
470 p
->mark
= Fmake_marker ();
472 /* If name is already in use, modify it until it is unused. */
477 tem
= Fget_process (name1
);
478 if (NILP (tem
)) break;
479 sprintf (suffix
, "<%d>", i
);
480 name1
= concat2 (name
, build_string (suffix
));
484 Vprocess_alist
= Fcons (Fcons (name
, val
), Vprocess_alist
);
488 remove_process (proc
)
489 register Lisp_Object proc
;
491 register Lisp_Object pair
;
493 pair
= Frassq (proc
, Vprocess_alist
);
494 Vprocess_alist
= Fdelq (pair
, Vprocess_alist
);
495 Fset_marker (XPROCESS (proc
)->mark
, Qnil
, Qnil
);
497 deactivate_process (proc
);
500 DEFUN ("processp", Fprocessp
, Sprocessp
, 1, 1, 0,
501 "Return t if OBJECT is a process.")
505 return XTYPE (obj
) == Lisp_Process
? Qt
: Qnil
;
508 DEFUN ("get-process", Fget_process
, Sget_process
, 1, 1, 0,
509 "Return the process named NAME, or nil if there is none.")
511 register Lisp_Object name
;
513 if (XTYPE (name
) == Lisp_Process
)
515 CHECK_STRING (name
, 0);
516 return Fcdr (Fassoc (name
, Vprocess_alist
));
519 DEFUN ("get-buffer-process", Fget_buffer_process
, Sget_buffer_process
, 1, 1, 0,
520 "Return the (or, a) process associated with BUFFER.\n\
521 BUFFER may be a buffer or the name of one.")
523 register Lisp_Object name
;
525 register Lisp_Object buf
, tail
, proc
;
527 if (NILP (name
)) return Qnil
;
528 buf
= Fget_buffer (name
);
529 if (NILP (buf
)) return Qnil
;
531 for (tail
= Vprocess_alist
; !NILP (tail
); tail
= Fcdr (tail
))
533 proc
= Fcdr (Fcar (tail
));
534 if (XTYPE (proc
) == Lisp_Process
&& EQ (XPROCESS (proc
)->buffer
, buf
))
540 /* This is how commands for the user decode process arguments. It
541 accepts a process, a process name, a buffer, a buffer name, or nil.
542 Buffers denote the first process in the buffer, and nil denotes the
547 register Lisp_Object name
;
549 register Lisp_Object proc
, obj
;
552 obj
= Fget_process (name
);
554 obj
= Fget_buffer (name
);
556 error ("Process %s does not exist", XSTRING (name
)->data
);
558 else if (NILP (name
))
559 obj
= Fcurrent_buffer ();
563 /* Now obj should be either a buffer object or a process object.
567 proc
= Fget_buffer_process (obj
);
569 error ("Buffer %s has no process", XSTRING (XBUFFER (obj
)->name
)->data
);
573 CHECK_PROCESS (obj
, 0);
579 DEFUN ("delete-process", Fdelete_process
, Sdelete_process
, 1, 1, 0,
580 "Delete PROCESS: kill it and forget about it immediately.\n\
581 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
582 nil, indicating the current buffer's process.")
584 register Lisp_Object proc
;
586 proc
= get_process (proc
);
587 XPROCESS (proc
)->raw_status_low
= Qnil
;
588 XPROCESS (proc
)->raw_status_high
= Qnil
;
589 if (NETCONN_P (proc
))
591 XPROCESS (proc
)->status
= Fcons (Qexit
, Fcons (make_number (0), Qnil
));
592 XSETINT (XPROCESS (proc
)->tick
, ++process_tick
);
594 else if (XINT (XPROCESS (proc
)->infd
) >= 0)
596 Fkill_process (proc
, Qnil
);
597 /* Do this now, since remove_process will make sigchld_handler do nothing. */
598 XPROCESS (proc
)->status
599 = Fcons (Qsignal
, Fcons (make_number (SIGKILL
), Qnil
));
600 XSETINT (XPROCESS (proc
)->tick
, ++process_tick
);
603 remove_process (proc
);
607 DEFUN ("process-status", Fprocess_status
, Sprocess_status
, 1, 1, 0,
608 "Return the status of PROCESS: a symbol, one of these:\n\
609 run -- for a process that is running.\n\
610 stop -- for a process stopped but continuable.\n\
611 exit -- for a process that has exited.\n\
612 signal -- for a process that has got a fatal signal.\n\
613 open -- for a network stream connection that is open.\n\
614 closed -- for a network stream connection that is closed.\n\
615 nil -- if arg is a process name and no such process exists.\n\
616 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
617 nil, indicating the current buffer's process.")
619 register Lisp_Object proc
;
621 register struct Lisp_Process
*p
;
622 register Lisp_Object status
;
623 proc
= get_process (proc
);
627 if (!NILP (p
->raw_status_low
))
630 if (XTYPE (status
) == Lisp_Cons
)
631 status
= XCONS (status
)->car
;
632 if (NETCONN_P (proc
))
634 if (EQ (status
, Qrun
))
636 else if (EQ (status
, Qexit
))
642 DEFUN ("process-exit-status", Fprocess_exit_status
, Sprocess_exit_status
,
644 "Return the exit status of PROCESS or the signal number that killed it.\n\
645 If PROCESS has not yet exited or died, return 0.")
647 register Lisp_Object proc
;
649 CHECK_PROCESS (proc
, 0);
650 if (!NILP (XPROCESS (proc
)->raw_status_low
))
651 update_status (XPROCESS (proc
));
652 if (XTYPE (XPROCESS (proc
)->status
) == Lisp_Cons
)
653 return XCONS (XCONS (XPROCESS (proc
)->status
)->cdr
)->car
;
654 return make_number (0);
657 DEFUN ("process-id", Fprocess_id
, Sprocess_id
, 1, 1, 0,
658 "Return the process id of PROCESS.\n\
659 This is the pid of the Unix process which PROCESS uses or talks to.\n\
660 For a network connection, this value is nil.")
662 register Lisp_Object proc
;
664 CHECK_PROCESS (proc
, 0);
665 return XPROCESS (proc
)->pid
;
668 DEFUN ("process-name", Fprocess_name
, Sprocess_name
, 1, 1, 0,
669 "Return the name of PROCESS, as a string.\n\
670 This is the name of the program invoked in PROCESS,\n\
671 possibly modified to make it unique among process names.")
673 register Lisp_Object proc
;
675 CHECK_PROCESS (proc
, 0);
676 return XPROCESS (proc
)->name
;
679 DEFUN ("process-command", Fprocess_command
, Sprocess_command
, 1, 1, 0,
680 "Return the command that was executed to start PROCESS.\n\
681 This is a list of strings, the first string being the program executed\n\
682 and the rest of the strings being the arguments given to it.\n\
683 For a non-child channel, this is nil.")
685 register Lisp_Object proc
;
687 CHECK_PROCESS (proc
, 0);
688 return XPROCESS (proc
)->command
;
691 DEFUN ("set-process-buffer", Fset_process_buffer
, Sset_process_buffer
,
693 "Set buffer associated with PROCESS to BUFFER (a buffer, or nil).")
695 register Lisp_Object proc
, buffer
;
697 CHECK_PROCESS (proc
, 0);
699 CHECK_BUFFER (buffer
, 1);
700 XPROCESS (proc
)->buffer
= buffer
;
704 DEFUN ("process-buffer", Fprocess_buffer
, Sprocess_buffer
,
706 "Return the buffer PROCESS is associated with.\n\
707 Output from PROCESS is inserted in this buffer\n\
708 unless PROCESS has a filter.")
710 register Lisp_Object proc
;
712 CHECK_PROCESS (proc
, 0);
713 return XPROCESS (proc
)->buffer
;
716 DEFUN ("process-mark", Fprocess_mark
, Sprocess_mark
,
718 "Return the marker for the end of the last output from PROCESS.")
720 register Lisp_Object proc
;
722 CHECK_PROCESS (proc
, 0);
723 return XPROCESS (proc
)->mark
;
726 DEFUN ("set-process-filter", Fset_process_filter
, Sset_process_filter
,
728 "Give PROCESS the filter function FILTER; nil means no filter.\n\
729 t means stop accepting output from the process.\n\
730 When a process has a filter, each time it does output\n\
731 the entire string of output is passed to the filter.\n\
732 The filter gets two arguments: the process and the string of output.\n\
733 If the process has a filter, its buffer is not used for output.")
735 register Lisp_Object proc
, filter
;
737 CHECK_PROCESS (proc
, 0);
739 FD_CLR (XINT (XPROCESS (proc
)->infd
), &input_wait_mask
);
740 else if (EQ (XPROCESS (proc
)->filter
, Qt
))
741 FD_SET (XINT (XPROCESS (proc
)->infd
), &input_wait_mask
);
742 XPROCESS (proc
)->filter
= filter
;
746 DEFUN ("process-filter", Fprocess_filter
, Sprocess_filter
,
748 "Returns the filter function of PROCESS; nil if none.\n\
749 See `set-process-filter' for more info on filter functions.")
751 register Lisp_Object proc
;
753 CHECK_PROCESS (proc
, 0);
754 return XPROCESS (proc
)->filter
;
757 DEFUN ("set-process-sentinel", Fset_process_sentinel
, Sset_process_sentinel
,
759 "Give PROCESS the sentinel SENTINEL; nil for none.\n\
760 The sentinel is called as a function when the process changes state.\n\
761 It gets two arguments: the process, and a string describing the change.")
763 register Lisp_Object proc
, sentinel
;
765 CHECK_PROCESS (proc
, 0);
766 XPROCESS (proc
)->sentinel
= sentinel
;
770 DEFUN ("process-sentinel", Fprocess_sentinel
, Sprocess_sentinel
,
772 "Return the sentinel of PROCESS; nil if none.\n\
773 See `set-process-sentinel' for more info on sentinels.")
775 register Lisp_Object proc
;
777 CHECK_PROCESS (proc
, 0);
778 return XPROCESS (proc
)->sentinel
;
781 DEFUN ("set-process-window-size", Fset_process_window_size
,
782 Sset_process_window_size
, 3, 3, 0,
783 "Tell PROCESS that it has logical window size HEIGHT and WIDTH.")
784 (proc
, height
, width
)
785 register Lisp_Object proc
, height
, width
;
787 CHECK_PROCESS (proc
, 0);
788 CHECK_NATNUM (height
, 0);
789 CHECK_NATNUM (width
, 0);
790 if (set_window_size (XINT (XPROCESS (proc
)->infd
),
791 XINT (height
), XINT(width
)) <= 0)
797 DEFUN ("process-kill-without-query", Fprocess_kill_without_query
,
798 Sprocess_kill_without_query
, 1, 2, 0,
799 "Say no query needed if PROCESS is running when Emacs is exited.\n\
800 Optional second argument if non-nil says to require a query.\n\
801 Value is t if a query was formerly required.")
803 register Lisp_Object proc
, value
;
807 CHECK_PROCESS (proc
, 0);
808 tem
= XPROCESS (proc
)->kill_without_query
;
809 XPROCESS (proc
)->kill_without_query
= Fnull (value
);
814 #if 0 /* Turned off because we don't currently record this info
815 in the process. Perhaps add it. */
816 DEFUN ("process-connection", Fprocess_connection
, Sprocess_connection
, 1, 1, 0,
817 "Return the connection type of `PROCESS'.\n\
818 The value is `nil' for a pipe,\n\
819 `t' or `pty' for a pty, or `stream' for a socket connection.")
823 return XPROCESS (process
)->type
;
830 register Lisp_Object tail
, tem
;
831 Lisp_Object proc
, minspace
, tem1
;
832 register struct buffer
*old
= current_buffer
;
833 register struct Lisp_Process
*p
;
837 XFASTINT (minspace
) = 1;
839 set_buffer_internal (XBUFFER (Vstandard_output
));
840 Fbuffer_disable_undo (Vstandard_output
);
842 current_buffer
->truncate_lines
= Qt
;
845 Proc Status Buffer Command\n\
846 ---- ------ ------ -------\n", -1);
848 for (tail
= Vprocess_alist
; !NILP (tail
); tail
= Fcdr (tail
))
852 proc
= Fcdr (Fcar (tail
));
854 if (NILP (p
->childp
))
857 Finsert (1, &p
->name
);
858 Findent_to (make_number (13), minspace
);
860 if (!NILP (p
->raw_status_low
))
863 if (XTYPE (p
->status
) == Lisp_Cons
)
864 symbol
= XCONS (p
->status
)->car
;
867 if (EQ (symbol
, Qsignal
))
870 tem
= Fcar (Fcdr (p
->status
));
872 if (XINT (tem
) < NSIG
)
873 write_string (sys_errlist
[XINT (tem
)], -1);
876 Fprinc (symbol
, Qnil
);
878 else if (NETCONN_P (proc
))
880 if (EQ (symbol
, Qrun
))
881 write_string ("open", -1);
882 else if (EQ (symbol
, Qexit
))
883 write_string ("closed", -1);
885 Fprinc (symbol
, Qnil
);
888 Fprinc (symbol
, Qnil
);
890 if (EQ (symbol
, Qexit
))
893 tem
= Fcar (Fcdr (p
->status
));
896 sprintf (tembuf
, " %d", XFASTINT (tem
));
897 write_string (tembuf
, -1);
901 if (EQ (symbol
, Qsignal
) || EQ (symbol
, Qexit
))
902 remove_process (proc
);
904 Findent_to (make_number (22), minspace
);
905 if (NILP (p
->buffer
))
906 insert_string ("(none)");
907 else if (NILP (XBUFFER (p
->buffer
)->name
))
908 insert_string ("(Killed)");
910 Finsert (1, &XBUFFER (p
->buffer
)->name
);
912 Findent_to (make_number (37), minspace
);
914 if (NETCONN_P (proc
))
916 sprintf (tembuf
, "(network stream connection to %s)\n",
917 XSTRING (p
->childp
)->data
);
918 insert_string (tembuf
);
932 insert_string ("\n");
938 DEFUN ("list-processes", Flist_processes
, Slist_processes
, 0, 0, "",
939 "Display a list of all processes.\n\
940 \(Any processes listed as Exited or Signaled are actually eliminated\n\
941 after the listing is made.)")
944 internal_with_output_to_temp_buffer ("*Process List*",
945 list_processes_1
, Qnil
);
949 DEFUN ("process-list", Fprocess_list
, Sprocess_list
, 0, 0, 0,
950 "Return a list of all processes.")
953 return Fmapcar (Qcdr
, Vprocess_alist
);
956 /* Starting asynchronous inferior processes. */
958 static Lisp_Object
start_process_unwind ();
960 DEFUN ("start-process", Fstart_process
, Sstart_process
, 3, MANY
, 0,
961 "Start a program in a subprocess. Return the process object for it.\n\
962 Args are NAME BUFFER PROGRAM &rest PROGRAM-ARGS\n\
963 NAME is name for process. It is modified if necessary to make it unique.\n\
964 BUFFER is the buffer or (buffer-name) to associate with the process.\n\
965 Process output goes at end of that buffer, unless you specify\n\
966 an output stream or filter function to handle the output.\n\
967 BUFFER may be also nil, meaning that this process is not associated\n\
969 Third arg is program file name. It is searched for as in the shell.\n\
970 Remaining arguments are strings to give program as arguments.")
973 register Lisp_Object
*args
;
975 Lisp_Object buffer
, name
, program
, proc
, current_dir
, tem
;
977 register unsigned char *new_argv
;
980 register unsigned char **new_argv
;
983 int count
= specpdl_ptr
- specpdl
;
987 buffer
= Fget_buffer_create (buffer
);
989 /* Make sure that the child will be able to chdir to the current
990 buffer's current directory, or its unhandled equivalent. We
991 can't just have the child check for an error when it does the
992 chdir, since it's in a vfork.
994 We have to GCPRO around this because Fexpand_file_name and
995 Funhandled_file_name_directory might call a file name handling
996 function. The argument list is protected by the caller, so all
997 we really have to worry about is buffer. */
999 struct gcpro gcpro1
, gcpro2
;
1001 current_dir
= current_buffer
->directory
;
1003 GCPRO2 (buffer
, current_dir
);
1006 expand_and_dir_to_file
1007 (Funhandled_file_name_directory (current_dir
), Qnil
);
1008 if (NILP (Ffile_accessible_directory_p (current_dir
)))
1009 report_file_error ("Setting current directory",
1010 Fcons (current_buffer
->directory
, Qnil
));
1016 CHECK_STRING (name
, 0);
1020 CHECK_STRING (program
, 2);
1023 /* Make a one member argv with all args concatenated
1024 together separated by a blank. */
1025 len
= XSTRING (program
)->size
+ 2;
1026 for (i
= 3; i
< nargs
; i
++)
1029 CHECK_STRING (tem
, i
);
1030 len
+= XSTRING (tem
)->size
+ 1; /* count the blank */
1032 new_argv
= (unsigned char *) alloca (len
);
1033 strcpy (new_argv
, XSTRING (program
)->data
);
1034 for (i
= 3; i
< nargs
; i
++)
1037 CHECK_STRING (tem
, i
);
1038 strcat (new_argv
, " ");
1039 strcat (new_argv
, XSTRING (tem
)->data
);
1041 /* Need to add code here to check for program existence on VMS */
1044 new_argv
= (unsigned char **) alloca ((nargs
- 1) * sizeof (char *));
1046 /* If program file name is not absolute, search our path for it */
1047 if (XSTRING (program
)->data
[0] != '/')
1049 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
;
1052 GCPRO4 (name
, program
, buffer
, current_dir
);
1053 openp (Vexec_path
, program
, EXEC_SUFFIXES
, &tem
, 1);
1056 report_file_error ("Searching for program", Fcons (program
, Qnil
));
1057 new_argv
[0] = XSTRING (tem
)->data
;
1060 new_argv
[0] = XSTRING (program
)->data
;
1062 for (i
= 3; i
< nargs
; i
++)
1065 CHECK_STRING (tem
, i
);
1066 new_argv
[i
- 2] = XSTRING (tem
)->data
;
1068 new_argv
[i
- 2] = 0;
1069 #endif /* not VMS */
1071 proc
= make_process (name
);
1072 /* If an error occurs and we can't start the process, we want to
1073 remove it from the process list. This means that each error
1074 check in create_process doesn't need to call remove_process
1075 itself; it's all taken care of here. */
1076 record_unwind_protect (start_process_unwind
, proc
);
1078 XPROCESS (proc
)->childp
= Qt
;
1079 XPROCESS (proc
)->command_channel_p
= Qnil
;
1080 XPROCESS (proc
)->buffer
= buffer
;
1081 XPROCESS (proc
)->sentinel
= Qnil
;
1082 XPROCESS (proc
)->filter
= Qnil
;
1083 XPROCESS (proc
)->command
= Flist (nargs
- 2, args
+ 2);
1085 create_process (proc
, new_argv
, current_dir
);
1087 return unbind_to (count
, proc
);
1090 /* This function is the unwind_protect form for Fstart_process. If
1091 PROC doesn't have its pid set, then we know someone has signalled
1092 an error and the process wasn't started successfully, so we should
1093 remove it from the process list. */
1095 start_process_unwind (proc
)
1098 if (XTYPE (proc
) != Lisp_Process
)
1101 /* Was PROC started successfully? */
1102 if (XINT (XPROCESS (proc
)->pid
) <= 0)
1103 remove_process (proc
);
1110 create_process_1 (signo
)
1114 /* USG systems forget handlers when they are used;
1115 must reestablish each time */
1116 signal (signo
, create_process_1
);
1120 #if 0 /* This doesn't work; see the note before sigchld_handler. */
1123 /* Mimic blocking of signals on system V, which doesn't really have it. */
1125 /* Nonzero means we got a SIGCHLD when it was supposed to be blocked. */
1126 int sigchld_deferred
;
1129 create_process_sigchld ()
1131 signal (SIGCHLD
, create_process_sigchld
);
1133 sigchld_deferred
= 1;
1139 #ifndef VMS /* VMS version of this function is in vmsproc.c. */
1140 create_process (process
, new_argv
, current_dir
)
1141 Lisp_Object process
;
1143 Lisp_Object current_dir
;
1145 int pid
, inchannel
, outchannel
, forkin
, forkout
;
1148 SIGTYPE (*sigchld
)();
1151 extern char **environ
;
1153 inchannel
= outchannel
= -1;
1156 if (EQ (Vprocess_connection_type
, Qt
))
1157 outchannel
= inchannel
= allocate_pty ();
1162 /* On USG systems it does not work to open the pty's tty here
1163 and then close and reopen it in the child. */
1165 /* Don't let this terminal become our controlling terminal
1166 (in case we don't have one). */
1167 forkout
= forkin
= open (pty_name
, O_RDWR
| O_NOCTTY
, 0);
1169 forkout
= forkin
= open (pty_name
, O_RDWR
, 0);
1172 report_file_error ("Opening pty", Qnil
);
1174 forkin
= forkout
= -1;
1175 #endif /* not USG */
1179 #endif /* HAVE_PTYS */
1182 if (socketpair (AF_UNIX
, SOCK_STREAM
, 0, sv
) < 0)
1183 report_file_error ("Opening socketpair", Qnil
);
1184 outchannel
= inchannel
= sv
[0];
1185 forkout
= forkin
= sv
[1];
1187 #else /* not SKTPAIR */
1196 #endif /* not SKTPAIR */
1199 /* Replaced by close_process_descs */
1200 set_exclusive_use (inchannel
);
1201 set_exclusive_use (outchannel
);
1204 /* Stride people say it's a mystery why this is needed
1205 as well as the O_NDELAY, but that it fails without this. */
1206 #if defined (STRIDE) || (defined (pfa) && defined (HAVE_PTYS))
1209 ioctl (inchannel
, FIONBIO
, &one
);
1214 fcntl (inchannel
, F_SETFL
, O_NONBLOCK
);
1217 fcntl (inchannel
, F_SETFL
, O_NDELAY
);
1221 /* Record this as an active process, with its channels.
1222 As a result, child_setup will close Emacs's side of the pipes. */
1223 chan_process
[inchannel
] = process
;
1224 XSET (XPROCESS (process
)->infd
, Lisp_Int
, inchannel
);
1225 XSET (XPROCESS (process
)->outfd
, Lisp_Int
, outchannel
);
1226 /* Record the tty descriptor used in the subprocess. */
1228 XPROCESS (process
)->subtty
= Qnil
;
1230 XFASTINT (XPROCESS (process
)->subtty
) = forkin
;
1231 XPROCESS (process
)->pty_flag
= (pty_flag
? Qt
: Qnil
);
1232 XPROCESS (process
)->status
= Qrun
;
1234 /* Delay interrupts until we have a chance to store
1235 the new fork's pid in its process structure */
1239 #else /* not BSD4_1 */
1240 #if defined (BSD) || defined (UNIPLUS) || defined (HPUX)
1241 sigsetmask (sigmask (SIGCHLD
));
1242 #else /* ordinary USG */
1244 sigchld_deferred
= 0;
1245 sigchld
= signal (SIGCHLD
, create_process_sigchld
);
1247 #endif /* ordinary USG */
1248 #endif /* not BSD4_1 */
1249 #endif /* SIGCHLD */
1251 /* Until we store the proper pid, enable sigchld_handler
1252 to recognize an unknown pid as standing for this process.
1253 It is very important not to let this `marker' value stay
1254 in the table after this function has returned; if it does
1255 it might cause call-process to hang and subsequent asynchronous
1256 processes to get their return values scrambled. */
1257 XSETINT (XPROCESS (process
)->pid
, -1);
1260 /* child_setup must clobber environ on systems with true vfork.
1261 Protect it from permanent change. */
1262 char **save_environ
= environ
;
1267 int xforkin
= forkin
;
1268 int xforkout
= forkout
;
1270 #if 0 /* This was probably a mistake--it duplicates code later on,
1271 but fails to handle all the cases. */
1272 /* Make sure SIGCHLD is not blocked in the child. */
1273 sigsetmask (SIGEMPTYMASK
);
1276 /* Make the pty be the controlling terminal of the process. */
1278 /* First, disconnect its current controlling terminal. */
1280 /* Make the pty's terminal the controlling terminal. */
1285 /* We ignore the return value
1286 because faith@cs.unc.edu says that is necessary on Linux. */
1287 ioctl (xforkin
, TIOCSCTTY
, 0);
1290 #else /* not HAVE_SETSID */
1292 /* It's very important to call setpgrp here and no time
1293 afterwards. Otherwise, we lose our controlling tty which
1294 is set when we open the pty. */
1297 #endif /* not HAVE_SETSID */
1298 #if defined (NTTYDISC) && defined (TIOCSETD)
1299 if (pty_flag
&& xforkin
>= 0)
1301 /* Use new line discipline. */
1302 int ldisc
= NTTYDISC
;
1303 if (ioctl (xforkin
, TIOCSETD
, &ldisc
) < 0)
1304 write (1, "create_process/TIOCSETD failed\n", 31);
1308 /* In 4.3BSD, the TIOCSPGRP bug has been fixed, and now you
1309 can do TIOCSPGRP only to the process's controlling tty. */
1312 /* I wonder: would just ioctl (0, TIOCNOTTY, 0) work here?
1313 I can't test it since I don't have 4.3. */
1314 int j
= open ("/dev/tty", O_RDWR
, 0);
1315 ioctl (j
, TIOCNOTTY
, 0);
1318 /* In order to get a controlling terminal on some versions
1319 of BSD, it is necessary to put the process in pgrp 0
1320 before it opens the terminal. */
1324 #endif /* TIOCNOTTY */
1326 #if !defined (RTU) && !defined (UNIPLUS)
1327 /*** There is a suggestion that this ought to be a
1328 conditional on TIOCSPGRP. */
1329 /* Now close the pty (if we had it open) and reopen it.
1330 This makes the pty the controlling terminal of the subprocess. */
1333 #ifdef SET_CHILD_PTY_PGRP
1334 int pgrp
= getpid ();
1337 /* I wonder if close (open (pty_name, ...)) would work? */
1340 xforkout
= xforkin
= open (pty_name
, O_RDWR
, 0);
1342 #ifdef SET_CHILD_PTY_PGRP
1343 ioctl (xforkin
, TIOCSPGRP
, &pgrp
);
1344 ioctl (xforkout
, TIOCSPGRP
, &pgrp
);
1350 #endif /* not UNIPLUS and not RTU */
1351 #ifdef SETUP_SLAVE_PTY
1353 #endif /* SETUP_SLAVE_PTY */
1355 /* On AIX, we've disabled SIGHUP above once we start a child on a pty.
1356 Now reenable it in the child, so it will die when we want it to. */
1358 signal (SIGHUP
, SIG_DFL
);
1360 #endif /* HAVE_PTYS */
1365 #else /* not BSD4_1 */
1366 #if defined (BSD) || defined (UNIPLUS) || defined (HPUX)
1367 sigsetmask (SIGEMPTYMASK
);
1368 #else /* ordinary USG */
1370 signal (SIGCHLD
, sigchld
);
1372 #endif /* ordinary USG */
1373 #endif /* not BSD4_1 */
1374 #endif /* SIGCHLD */
1376 child_setup_tty (xforkout
);
1377 child_setup (xforkin
, xforkout
, xforkout
,
1378 new_argv
, 1, current_dir
);
1380 environ
= save_environ
;
1384 report_file_error ("Doing vfork", Qnil
);
1386 XFASTINT (XPROCESS (process
)->pid
) = pid
;
1388 FD_SET (inchannel
, &input_wait_mask
);
1389 if (inchannel
> max_process_desc
)
1390 max_process_desc
= inchannel
;
1392 /* If the subfork execv fails, and it exits,
1393 this close hangs. I don't know why.
1394 So have an interrupt jar it loose. */
1396 signal (SIGALRM
, create_process_1
);
1398 XPROCESS (process
)->subtty
= Qnil
;
1403 if (forkin
!= forkout
&& forkout
>= 0)
1409 #else /* not BSD4_1 */
1410 #if defined (BSD) || defined (UNIPLUS) || defined (HPUX)
1411 sigsetmask (SIGEMPTYMASK
);
1412 #else /* ordinary USG */
1414 signal (SIGCHLD
, sigchld
);
1415 /* Now really handle any of these signals
1416 that came in during this function. */
1417 if (sigchld_deferred
)
1418 kill (getpid (), SIGCHLD
);
1420 #endif /* ordinary USG */
1421 #endif /* not BSD4_1 */
1422 #endif /* SIGCHLD */
1424 #endif /* not VMS */
1428 /* open a TCP network connection to a given HOST/SERVICE. Treated
1429 exactly like a normal process when reading and writing. Only
1430 differences are in status display and process deletion. A network
1431 connection has no PID; you cannot signal it. All you can do is
1432 deactivate and close it via delete-process */
1434 DEFUN ("open-network-stream", Fopen_network_stream
, Sopen_network_stream
,
1436 "Open a TCP connection for a service to a host.\n\
1437 Returns a subprocess-object to represent the connection.\n\
1438 Input and output work as for subprocesses; `delete-process' closes it.\n\
1439 Args are NAME BUFFER HOST SERVICE.\n\
1440 NAME is name for process. It is modified if necessary to make it unique.\n\
1441 BUFFER is the buffer (or buffer-name) to associate with the process.\n\
1442 Process output goes at end of that buffer, unless you specify\n\
1443 an output stream or filter function to handle the output.\n\
1444 BUFFER may be also nil, meaning that this process is not associated\n\
1446 Third arg is name of the host to connect to, or its IP address.\n\
1447 Fourth arg SERVICE is name of the service desired, or an integer\n\
1448 specifying a port number to connect to.")
1449 (name
, buffer
, host
, service
)
1450 Lisp_Object name
, buffer
, host
, service
;
1454 struct sockaddr_in address
;
1455 struct servent
*svc_info
;
1456 struct hostent
*host_info_ptr
, host_info
;
1457 char *(addr_list
[2]);
1458 IN_ADDR numeric_addr
;
1462 struct hostent host_info_fixed
;
1463 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
;
1465 GCPRO4 (name
, buffer
, host
, service
);
1466 CHECK_STRING (name
, 0);
1467 CHECK_STRING (host
, 0);
1468 if (XTYPE(service
) == Lisp_Int
)
1469 port
= htons ((unsigned short) XINT (service
));
1472 CHECK_STRING (service
, 0);
1473 svc_info
= getservbyname (XSTRING (service
)->data
, "tcp");
1475 error ("Unknown service \"%s\"", XSTRING (service
)->data
);
1476 port
= svc_info
->s_port
;
1480 host_info_ptr
= gethostbyname (XSTRING (host
)->data
);
1481 if (host_info_ptr
== 0)
1482 /* Attempt to interpret host as numeric inet address */
1484 numeric_addr
= inet_addr ((char *) XSTRING (host
)->data
);
1485 if (NUMERIC_ADDR_ERROR
)
1486 error ("Unknown host \"%s\"", XSTRING (host
)->data
);
1488 host_info_ptr
= &host_info
;
1489 host_info
.h_name
= 0;
1490 host_info
.h_aliases
= 0;
1491 host_info
.h_addrtype
= AF_INET
;
1493 /* Older machines have only one address slot called h_addr.
1494 Newer machines have h_addr_list, but #define h_addr to
1495 be its first element. */
1496 host_info
.h_addr_list
= &(addr_list
[0]);
1498 host_info
.h_addr
= (char*)(&numeric_addr
);
1500 host_info
.h_length
= strlen (addr_list
[0]);
1503 bzero (&address
, sizeof address
);
1504 bcopy (host_info_ptr
->h_addr
, (char *) &address
.sin_addr
,
1505 host_info_ptr
->h_length
);
1506 address
.sin_family
= host_info_ptr
->h_addrtype
;
1507 address
.sin_port
= port
;
1509 s
= socket (host_info_ptr
->h_addrtype
, SOCK_STREAM
, 0);
1511 report_file_error ("error creating socket", Fcons (name
, Qnil
));
1513 /* Kernel bugs (on Ultrix at least) cause lossage (not just EINTR)
1514 when connect is interrupted. So let's not let it get interrupted.
1515 Note we do not turn off polling, because polling is only used
1516 when not interrupt_input, and thus not normally used on the systems
1517 which have this bug. On systems which use polling, there's no way
1518 to quit if polling is turned off. */
1519 if (interrupt_input
)
1523 if (connect (s
, (struct sockaddr
*) &address
, sizeof address
) == -1)
1530 if (interrupt_input
)
1534 report_file_error ("connection failed",
1535 Fcons (host
, Fcons (name
, Qnil
)));
1538 if (interrupt_input
)
1542 s
= connect_server (0);
1544 report_file_error ("error creating socket", Fcons (name
, Qnil
));
1545 send_command (s
, C_PORT
, 0, "%s:%d", XSTRING (host
)->data
, ntohs (port
));
1546 send_command (s
, C_DUMB
, 1, 0);
1552 report_file_error ("error duplicating socket", Fcons (name
, Qnil
));
1555 buffer
= Fget_buffer_create (buffer
);
1556 proc
= make_process (name
);
1558 chan_process
[inch
] = proc
;
1561 fcntl (inch
, F_SETFL
, O_NONBLOCK
);
1564 fcntl (inch
, F_SETFL
, O_NDELAY
);
1568 XPROCESS (proc
)->childp
= host
;
1569 XPROCESS (proc
)->command_channel_p
= Qnil
;
1570 XPROCESS (proc
)->buffer
= buffer
;
1571 XPROCESS (proc
)->sentinel
= Qnil
;
1572 XPROCESS (proc
)->filter
= Qnil
;
1573 XPROCESS (proc
)->command
= Qnil
;
1574 XPROCESS (proc
)->pid
= Qnil
;
1575 XSET (XPROCESS (proc
)->infd
, Lisp_Int
, s
);
1576 XSET (XPROCESS (proc
)->outfd
, Lisp_Int
, outch
);
1577 XPROCESS (proc
)->status
= Qrun
;
1578 FD_SET (inch
, &input_wait_mask
);
1579 if (inch
> max_process_desc
)
1580 max_process_desc
= inch
;
1585 #endif /* HAVE_SOCKETS */
1587 deactivate_process (proc
)
1590 register int inchannel
, outchannel
;
1591 register struct Lisp_Process
*p
= XPROCESS (proc
);
1593 inchannel
= XINT (p
->infd
);
1594 outchannel
= XINT (p
->outfd
);
1598 /* Beware SIGCHLD hereabouts. */
1599 flush_pending_output (inchannel
);
1602 VMS_PROC_STUFF
*get_vms_process_pointer (), *vs
;
1603 sys$
dassgn (outchannel
);
1604 vs
= get_vms_process_pointer (p
->pid
);
1606 give_back_vms_process_stuff (vs
);
1610 if (outchannel
>= 0 && outchannel
!= inchannel
)
1614 XSET (p
->infd
, Lisp_Int
, -1);
1615 XSET (p
->outfd
, Lisp_Int
, -1);
1616 chan_process
[inchannel
] = Qnil
;
1617 FD_CLR (inchannel
, &input_wait_mask
);
1618 if (inchannel
== max_process_desc
)
1621 /* We just closed the highest-numbered process input descriptor,
1622 so recompute the highest-numbered one now. */
1623 max_process_desc
= 0;
1624 for (i
= 0; i
< MAXDESC
; i
++)
1625 if (!NILP (chan_process
[i
]))
1626 max_process_desc
= i
;
1631 /* Close all descriptors currently in use for communication
1632 with subprocess. This is used in a newly-forked subprocess
1633 to get rid of irrelevant descriptors. */
1635 close_process_descs ()
1638 for (i
= 0; i
< MAXDESC
; i
++)
1640 Lisp_Object process
;
1641 process
= chan_process
[i
];
1642 if (!NILP (process
))
1644 int in
= XINT (XPROCESS (process
)->infd
);
1645 int out
= XINT (XPROCESS (process
)->outfd
);
1648 if (out
>= 0 && in
!= out
)
1654 DEFUN ("accept-process-output", Faccept_process_output
, Saccept_process_output
,
1656 "Allow any pending output from subprocesses to be read by Emacs.\n\
1657 It is read into the process' buffers or given to their filter functions.\n\
1658 Non-nil arg PROCESS means do not return until some output has been received\n\
1660 Non-nil second arg TIMEOUT and third arg TIMEOUT-MSECS are number of\n\
1661 seconds and microseconds to wait; return after that much time whether\n\
1662 or not there is input.\n\
1663 Return non-nil iff we received any output before the timeout expired.")
1664 (proc
, timeout
, timeout_msecs
)
1665 register Lisp_Object proc
, timeout
, timeout_msecs
;
1670 if (! NILP (timeout_msecs
))
1672 CHECK_NUMBER (timeout_msecs
, 2);
1673 useconds
= XINT (timeout_msecs
);
1674 if (XTYPE (timeout
) != Lisp_Int
)
1675 XSET (timeout
, Lisp_Int
, 0);
1678 int carry
= useconds
/ 1000000;
1680 XSETINT (timeout
, XINT (timeout
) + carry
);
1681 useconds
-= carry
* 1000000;
1683 /* I think this clause is necessary because C doesn't
1684 guarantee a particular rounding direction for negative
1688 XSETINT (timeout
, XINT (timeout
) - 1);
1689 useconds
+= 1000000;
1696 if (! NILP (timeout
))
1698 CHECK_NUMBER (timeout
, 1);
1699 seconds
= XINT (timeout
);
1712 XFASTINT (proc
) = 0;
1715 (wait_reading_process_input (seconds
, useconds
, proc
, 0)
1719 /* This variable is different from waiting_for_input in keyboard.c.
1720 It is used to communicate to a lisp process-filter/sentinel (via the
1721 function Fwaiting_for_user_input_p below) whether emacs was waiting
1722 for user-input when that process-filter was called.
1723 waiting_for_input cannot be used as that is by definition 0 when
1724 lisp code is being evalled */
1725 static int waiting_for_user_input_p
;
1727 /* Read and dispose of subprocess output while waiting for timeout to
1728 elapse and/or keyboard input to be available.
1731 timeout in seconds, or
1732 zero for no limit, or
1733 -1 means gobble data immediately available but don't wait for any.
1736 an additional duration to wait, measured in microseconds.
1737 If this is nonzero and time_limit is 0, then the timeout
1738 consists of MICROSECS only.
1740 READ_KBD is a lisp value:
1741 0 to ignore keyboard input, or
1742 1 to return when input is available, or
1743 -1 meaning caller will actually read the input, so don't throw to
1744 the quit handler, or
1745 a cons cell, meaning wait until its car is non-nil
1746 (and gobble terminal input into the buffer if any arrives), or
1747 a process object, meaning wait until something arrives from that
1748 process. The return value is true iff we read some input from
1751 DO_DISPLAY != 0 means redisplay should be done to show subprocess
1752 output that arrives.
1754 If READ_KBD is a pointer to a struct Lisp_Process, then the
1755 function returns true iff we received input from that process
1756 before the timeout elapsed.
1757 Otherwise, return true iff we received input from any process. */
1759 wait_reading_process_input (time_limit
, microsecs
, read_kbd
, do_display
)
1760 int time_limit
, microsecs
;
1761 Lisp_Object read_kbd
;
1764 register int channel
, nfds
, m
;
1765 static SELECT_TYPE Available
;
1768 EMACS_TIME timeout
, end_time
, garbage
;
1770 int wait_channel
= -1;
1771 struct Lisp_Process
*wait_proc
= 0;
1772 int got_some_input
= 0;
1773 Lisp_Object
*wait_for_cell
= 0;
1775 FD_ZERO (&Available
);
1777 /* If read_kbd is a process to watch, set wait_proc and wait_channel
1779 if (XTYPE (read_kbd
) == Lisp_Process
)
1781 wait_proc
= XPROCESS (read_kbd
);
1782 wait_channel
= XINT (wait_proc
->infd
);
1783 XFASTINT (read_kbd
) = 0;
1786 /* If waiting for non-nil in a cell, record where. */
1787 if (XTYPE (read_kbd
) == Lisp_Cons
)
1789 wait_for_cell
= &XCONS (read_kbd
)->car
;
1790 XFASTINT (read_kbd
) = 0;
1793 waiting_for_user_input_p
= XINT (read_kbd
);
1795 /* Since we may need to wait several times,
1796 compute the absolute time to return at. */
1797 if (time_limit
|| microsecs
)
1799 EMACS_GET_TIME (end_time
);
1800 EMACS_SET_SECS_USECS (timeout
, time_limit
, microsecs
);
1801 EMACS_ADD_TIME (end_time
, end_time
, timeout
);
1804 /* It would not be safe to call this below,
1805 where we call redisplay_preserve_echo_area. */
1806 prepare_menu_bars ();
1810 /* If calling from keyboard input, do not quit
1811 since we want to return C-g as an input character.
1812 Otherwise, do pending quit if requested. */
1813 if (XINT (read_kbd
) >= 0)
1816 /* Exit now if the cell we're waiting for became non-nil. */
1817 if (wait_for_cell
&& ! NILP (*wait_for_cell
))
1820 /* Compute time from now till when time limit is up */
1821 /* Exit if already run out */
1822 if (time_limit
== -1)
1824 /* -1 specified for timeout means
1825 gobble output available now
1826 but don't wait at all. */
1828 EMACS_SET_SECS_USECS (timeout
, 0, 0);
1830 else if (time_limit
|| microsecs
)
1832 EMACS_GET_TIME (timeout
);
1833 EMACS_SUB_TIME (timeout
, end_time
, timeout
);
1834 if (EMACS_TIME_NEG_P (timeout
))
1839 EMACS_SET_SECS_USECS (timeout
, 100000, 0);
1842 /* Cause C-g and alarm signals to take immediate action,
1843 and cause input available signals to zero out timeout.
1845 It is important that we do this before checking for process
1846 activity. If we get a SIGCHLD after the explicit checks for
1847 process activity, timeout is the only way we will know. */
1848 if (XINT (read_kbd
) < 0)
1849 set_waiting_for_input (&timeout
);
1851 /* If status of something has changed, and no input is
1852 available, notify the user of the change right away. After
1853 this explicit check, we'll let the SIGCHLD handler zap
1854 timeout to get our attention. */
1855 if (update_tick
!= process_tick
&& do_display
)
1857 Atemp
= input_wait_mask
;
1858 EMACS_SET_SECS_USECS (timeout
, 0, 0);
1859 if (select (MAXDESC
, &Atemp
, 0, 0, &timeout
) <= 0)
1861 /* It's okay for us to do this and then continue with
1862 the loop, since timeout has already been zeroed out. */
1863 clear_waiting_for_input ();
1868 /* Don't wait for output from a non-running process. */
1869 if (wait_proc
!= 0 && !NILP (wait_proc
->raw_status_low
))
1870 update_status (wait_proc
);
1872 && ! EQ (wait_proc
->status
, Qrun
))
1874 clear_waiting_for_input ();
1878 /* Wait till there is something to do */
1880 Available
= input_wait_mask
;
1881 /* We used to have && wait_for_cell == 0
1882 but that led to lossage handling selection_request events:
1883 within one, we would start to handle another. */
1884 if (! XINT (read_kbd
))
1885 FD_CLR (keyboard_descriptor
, &Available
);
1887 /* If frame size has changed or the window is newly mapped,
1888 redisplay now, before we start to wait. There is a race
1889 condition here; if a SIGIO arrives between now and the select
1890 and indicates that a frame is trashed, the select may block
1891 displaying a trashed screen. */
1892 if (frame_garbaged
&& do_display
)
1893 redisplay_preserve_echo_area ();
1895 if (XINT (read_kbd
) && detect_input_pending ())
1898 FD_ZERO (&Available
);
1901 nfds
= select (MAXDESC
, &Available
, 0, 0, &timeout
);
1905 /* Make C-g and alarm signals set flags again */
1906 clear_waiting_for_input ();
1908 /* If we woke up due to SIGWINCH, actually change size now. */
1909 do_pending_window_change ();
1911 if (time_limit
&& nfds
== 0) /* timeout elapsed */
1915 if (xerrno
== EINTR
)
1916 FD_ZERO (&Available
);
1918 /* Ultrix select seems to return ENOMEM when it is
1919 interrupted. Treat it just like EINTR. Bleah. Note
1920 that we want to test for the "ultrix" CPP symbol, not
1921 "__ultrix__"; the latter is only defined under GCC, but
1922 not by DEC's bundled CC. -JimB */
1923 else if (xerrno
== ENOMEM
)
1924 FD_ZERO (&Available
);
1927 /* This happens for no known reason on ALLIANT.
1928 I am guessing that this is the right response. -- RMS. */
1929 else if (xerrno
== EFAULT
)
1930 FD_ZERO (&Available
);
1932 else if (xerrno
== EBADF
)
1935 /* AIX doesn't handle PTY closure the same way BSD does. On AIX,
1936 the child's closure of the pts gives the parent a SIGHUP, and
1937 the ptc file descriptor is automatically closed,
1938 yielding EBADF here or at select() call above.
1939 So, SIGHUP is ignored (see def of PTY_TTY_NAME_SPRINTF
1940 in m/ibmrt-aix.h), and here we just ignore the select error.
1941 Cleanup occurs c/o status_notify after SIGCLD. */
1942 FD_ZERO (&Available
); /* Cannot depend on values returned */
1948 error("select error: %s", strerror (xerrno
));
1950 #if defined(sun) && !defined(USG5_4)
1951 else if (nfds
> 0 && FD_ISSET (keyboard_descriptor
, &Available
)
1953 /* System sometimes fails to deliver SIGIO.
1955 David J. Mackenzie says that Emacs doesn't compile under
1956 Solaris if this code is enabled, thus the USG5_4 in the CPP
1957 conditional. "I haven't noticed any ill effects so far.
1958 If you find a Solaris expert somewhere, they might know
1960 kill (getpid (), SIGIO
);
1963 /* Check for keyboard input */
1964 /* If there is any, return immediately
1965 to give it higher priority than subprocesses */
1967 /* We used to do this if wait_for_cell,
1968 but that caused infinite recursion in selection request events. */
1969 if ((XINT (read_kbd
))
1970 && detect_input_pending ())
1973 if (detect_input_pending ())
1977 /* Exit now if the cell we're waiting for became non-nil. */
1978 if (wait_for_cell
&& ! NILP (*wait_for_cell
))
1982 /* If we think we have keyboard input waiting, but didn't get SIGIO
1983 go read it. This can happen with X on BSD after logging out.
1984 In that case, there really is no input and no SIGIO,
1985 but select says there is input. */
1987 if (XINT (read_kbd
) && interrupt_input
1988 && (FD_ISSET (keyboard_descriptor
, &Available
)))
1993 got_some_input
|= nfds
> 0;
1995 /* If checking input just got us a size-change event from X,
1996 obey it now if we should. */
1997 if (XINT (read_kbd
) || wait_for_cell
)
1998 do_pending_window_change ();
2000 /* Check for data from a process. */
2001 /* Really FIRST_PROC_DESC should be 0 on Unix,
2002 but this is safer in the short run. */
2003 for (channel
= keyboard_descriptor
== 0 ? FIRST_PROC_DESC
: 0;
2004 channel
<= max_process_desc
; channel
++)
2006 if (FD_ISSET (channel
, &Available
))
2010 /* If waiting for this channel, arrange to return as
2011 soon as no more input to be processed. No more
2013 if (wait_channel
== channel
)
2019 proc
= chan_process
[channel
];
2023 /* Read data from the process, starting with our
2024 buffered-ahead character if we have one. */
2026 nread
= read_process_output (proc
, channel
);
2029 /* Since read_process_output can run a filter,
2030 which can call accept-process-output,
2031 don't try to read from any other processes
2032 before doing the select again. */
2033 FD_ZERO (&Available
);
2036 redisplay_preserve_echo_area ();
2039 else if (nread
== -1 && errno
== EWOULDBLOCK
)
2043 else if (nread
== -1 && errno
== EAGAIN
)
2047 else if (nread
== -1 && errno
== EAGAIN
)
2049 /* Note that we cannot distinguish between no input
2050 available now and a closed pipe.
2051 With luck, a closed pipe will be accompanied by
2052 subprocess termination and SIGCHLD. */
2053 else if (nread
== 0 && !NETCONN_P (proc
))
2055 #endif /* O_NDELAY */
2056 #endif /* O_NONBLOCK */
2057 #endif /* EWOULDBLOCK */
2059 /* On some OSs with ptys, when the process on one end of
2060 a pty exits, the other end gets an error reading with
2061 errno = EIO instead of getting an EOF (0 bytes read).
2062 Therefore, if we get an error reading and errno =
2063 EIO, just continue, because the child process has
2064 exited and should clean itself up soon (e.g. when we
2066 else if (nread
== -1 && errno
== EIO
)
2068 #endif /* HAVE_PTYS */
2069 /* If we can detect process termination, don't consider the process
2070 gone just because its pipe is closed. */
2072 else if (nread
== 0 && !NETCONN_P (proc
))
2077 /* Preserve status of processes already terminated. */
2078 XSETINT (XPROCESS (proc
)->tick
, ++process_tick
);
2079 deactivate_process (proc
);
2080 if (!NILP (XPROCESS (proc
)->raw_status_low
))
2081 update_status (XPROCESS (proc
));
2082 if (EQ (XPROCESS (proc
)->status
, Qrun
))
2083 XPROCESS (proc
)->status
2084 = Fcons (Qexit
, Fcons (make_number (256), Qnil
));
2087 } /* end for each file descriptor */
2088 } /* end while exit conditions not met */
2090 /* If calling from keyboard input, do not quit
2091 since we want to return C-g as an input character.
2092 Otherwise, do pending quit if requested. */
2093 if (XINT (read_kbd
) >= 0)
2095 /* Prevent input_pending from remaining set if we quit. */
2096 clear_input_pending ();
2100 return got_some_input
;
2103 /* Read pending output from the process channel,
2104 starting with our buffered-ahead character if we have one.
2105 Yield number of characters read.
2107 This function reads at most 1024 characters.
2108 If you want to read all available subprocess output,
2109 you must call it repeatedly until it returns zero. */
2111 read_process_output (proc
, channel
)
2113 register int channel
;
2115 register int nchars
;
2121 register Lisp_Object outstream
;
2122 register struct buffer
*old
= current_buffer
;
2123 register struct Lisp_Process
*p
= XPROCESS (proc
);
2124 register int opoint
;
2127 VMS_PROC_STUFF
*vs
, *get_vms_process_pointer();
2129 vs
= get_vms_process_pointer (p
->pid
);
2133 return(0); /* Really weird if it does this */
2134 if (!(vs
->iosb
[0] & 1))
2135 return -1; /* I/O error */
2138 error ("Could not get VMS process pointer");
2139 chars
= vs
->inputBuffer
;
2140 nchars
= clean_vms_buffer (chars
, vs
->iosb
[1]);
2143 start_vms_process_read (vs
); /* Crank up the next read on the process */
2144 return 1; /* Nothing worth printing, say we got 1 */
2148 if (proc_buffered_char
[channel
] < 0)
2149 nchars
= read (channel
, chars
, sizeof chars
);
2152 chars
[0] = proc_buffered_char
[channel
];
2153 proc_buffered_char
[channel
] = -1;
2154 nchars
= read (channel
, chars
+ 1, sizeof chars
- 1);
2158 nchars
= nchars
+ 1;
2160 #endif /* not VMS */
2162 if (nchars
<= 0) return nchars
;
2164 outstream
= p
->filter
;
2165 if (!NILP (outstream
))
2167 /* We inhibit quit here instead of just catching it so that
2168 hitting ^G when a filter happens to be running won't screw
2170 int count
= specpdl_ptr
- specpdl
;
2171 Lisp_Object odeactivate
;
2172 Lisp_Object obuffer
;
2174 odeactivate
= Vdeactivate_mark
;
2175 obuffer
= Fcurrent_buffer ();
2177 specbind (Qinhibit_quit
, Qt
);
2178 call2 (outstream
, proc
, make_string (chars
, nchars
));
2180 /* Handling the process output should not deactivate the mark. */
2181 Vdeactivate_mark
= odeactivate
;
2183 if (! EQ (Fcurrent_buffer (), obuffer
))
2184 record_asynch_buffer_change ();
2187 start_vms_process_read (vs
);
2189 unbind_to (count
, Qnil
);
2193 /* If no filter, write into buffer if it isn't dead. */
2194 if (!NILP (p
->buffer
) && !NILP (XBUFFER (p
->buffer
)->name
))
2196 Lisp_Object old_read_only
;
2197 Lisp_Object old_begv
, old_zv
;
2198 Lisp_Object odeactivate
;
2200 odeactivate
= Vdeactivate_mark
;
2202 Fset_buffer (p
->buffer
);
2204 old_read_only
= current_buffer
->read_only
;
2205 XFASTINT (old_begv
) = BEGV
;
2206 XFASTINT (old_zv
) = ZV
;
2208 current_buffer
->read_only
= Qnil
;
2210 /* Insert new output into buffer
2211 at the current end-of-output marker,
2212 thus preserving logical ordering of input and output. */
2213 if (XMARKER (p
->mark
)->buffer
)
2214 SET_PT (clip_to_bounds (BEGV
, marker_position (p
->mark
), ZV
));
2218 /* If the output marker is outside of the visible region, save
2219 the restriction and widen. */
2220 if (! (BEGV
<= point
&& point
<= ZV
))
2223 /* Make sure opoint floats ahead of any new text, just as point
2225 if (point
<= opoint
)
2228 /* Insert after old_begv, but before old_zv. */
2229 if (point
< XFASTINT (old_begv
))
2230 XFASTINT (old_begv
) += nchars
;
2231 if (point
<= XFASTINT (old_zv
))
2232 XFASTINT (old_zv
) += nchars
;
2234 /* Insert before markers in case we are inserting where
2235 the buffer's mark is, and the user's next command is Meta-y. */
2236 insert_before_markers (chars
, nchars
);
2237 Fset_marker (p
->mark
, make_number (point
), p
->buffer
);
2239 update_mode_lines
++;
2241 /* If the restriction isn't what it should be, set it. */
2242 if (XFASTINT (old_begv
) != BEGV
|| XFASTINT (old_zv
) != ZV
)
2243 Fnarrow_to_region (old_begv
, old_zv
);
2245 /* Handling the process output should not deactivate the mark. */
2246 Vdeactivate_mark
= odeactivate
;
2248 current_buffer
->read_only
= old_read_only
;
2250 set_buffer_internal (old
);
2253 start_vms_process_read (vs
);
2258 DEFUN ("waiting-for-user-input-p", Fwaiting_for_user_input_p
, Swaiting_for_user_input_p
,
2260 "Returns non-NIL if emacs is waiting for input from the user.\n\
2261 This is intended for use by asynchronous process output filters and sentinels.")
2264 return ((waiting_for_user_input_p
) ? Qt
: Qnil
);
2267 /* Sending data to subprocess */
2269 jmp_buf send_process_frame
;
2272 send_process_trap ()
2278 longjmp (send_process_frame
, 1);
2281 send_process (proc
, buf
, len
)
2286 /* Don't use register vars; longjmp can lose them. */
2288 unsigned char *procname
= XSTRING (XPROCESS (proc
)->name
)->data
;
2292 struct Lisp_Process
*p
= XPROCESS (proc
);
2293 VMS_PROC_STUFF
*vs
, *get_vms_process_pointer();
2296 if (! NILP (XPROCESS (proc
)->raw_status_low
))
2297 update_status (XPROCESS (proc
));
2298 if (! EQ (XPROCESS (proc
)->status
, Qrun
))
2299 error ("Process %s not running", procname
);
2302 vs
= get_vms_process_pointer (p
->pid
);
2304 error ("Could not find this process: %x", p
->pid
);
2305 else if (write_to_vms_process (vs
, buf
, len
))
2308 if (!setjmp (send_process_frame
))
2312 SIGTYPE (*old_sigpipe
)();
2315 if (pty_max_bytes
== 0)
2317 #if defined (HAVE_FPATHCONF) && defined (_PC_MAX_CANON)
2318 pty_max_bytes
= fpathconf (XFASTINT (XPROCESS (proc
)->outfd
),
2320 if (pty_max_bytes
< 0)
2321 pty_max_bytes
= 250;
2323 pty_max_bytes
= 250;
2327 /* Don't send more than pty_max_bytes bytes at a time. */
2328 /* Subtract 1 to leave room for the EOF. */
2329 if (this >= pty_max_bytes
&& !NILP (XPROCESS (proc
)->pty_flag
))
2330 this = pty_max_bytes
- 1;
2332 old_sigpipe
= (SIGTYPE (*) ()) signal (SIGPIPE
, send_process_trap
);
2333 rv
= write (XINT (XPROCESS (proc
)->outfd
), buf
, this);
2335 /* If we sent just part of the string, put in an EOF
2336 to force it through, before we send the rest. */
2338 Fprocess_send_eof (proc
);
2340 signal (SIGPIPE
, old_sigpipe
);
2345 || errno
== EWOULDBLOCK
2352 /* It would be nice to accept process output here,
2353 but that is difficult. For example, it could
2354 garbage what we are sending if that is from a buffer. */
2361 report_file_error ("writing to process", Fcons (proc
, Qnil
));
2365 /* Allow input from processes between bursts of sending.
2366 Otherwise things may get stopped up. */
2371 XFASTINT (zero
) = 0;
2372 wait_reading_process_input (-1, 0, zero
, 0);
2378 XPROCESS (proc
)->raw_status_low
= Qnil
;
2379 XPROCESS (proc
)->raw_status_high
= Qnil
;
2380 XPROCESS (proc
)->status
= Fcons (Qexit
, Fcons (make_number (256), Qnil
));
2381 XSETINT (XPROCESS (proc
)->tick
, ++process_tick
);
2382 deactivate_process (proc
);
2384 error ("Error writing to process %s; closed it", procname
);
2386 error ("SIGPIPE raised on process %s; closed it", procname
);
2391 DEFUN ("process-send-region", Fprocess_send_region
, Sprocess_send_region
,
2393 "Send current contents of region as input to PROCESS.\n\
2394 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
2395 nil, indicating the current buffer's process.\n\
2396 Called from program, takes three arguments, PROCESS, START and END.\n\
2397 If the region is more than 500 characters long,\n\
2398 it is sent in several bunches. This may happen even for shorter regions.\n\
2399 Output from processes can arrive in between bunches.")
2400 (process
, start
, end
)
2401 Lisp_Object process
, start
, end
;
2406 proc
= get_process (process
);
2407 validate_region (&start
, &end
);
2409 if (XINT (start
) < GPT
&& XINT (end
) > GPT
)
2412 start1
= XINT (start
);
2413 send_process (proc
, &FETCH_CHAR (start1
), XINT (end
) - XINT (start
));
2418 DEFUN ("process-send-string", Fprocess_send_string
, Sprocess_send_string
,
2420 "Send PROCESS the contents of STRING as input.\n\
2421 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
2422 nil, indicating the current buffer's process.\n\
2423 If STRING is more than 500 characters long,\n\
2424 it is sent in several bunches. This may happen even for shorter strings.\n\
2425 Output from processes can arrive in between bunches.")
2427 Lisp_Object process
, string
;
2430 CHECK_STRING (string
, 1);
2431 proc
= get_process (process
);
2432 send_process (proc
, XSTRING (string
)->data
, XSTRING (string
)->size
);
2436 /* send a signal number SIGNO to PROCESS.
2437 CURRENT_GROUP means send to the process group that currently owns
2438 the terminal being used to communicate with PROCESS.
2439 This is used for various commands in shell mode.
2440 If NOMSG is zero, insert signal-announcements into process's buffers
2443 If we can, we try to signal PROCESS by sending control characters
2444 down the pipe. This allows us to signal inferiors who have changed
2445 their uid, for which killpg would return an EPERM error. */
2448 process_send_signal (process
, signo
, current_group
, nomsg
)
2449 Lisp_Object process
;
2451 Lisp_Object current_group
;
2455 register struct Lisp_Process
*p
;
2459 proc
= get_process (process
);
2460 p
= XPROCESS (proc
);
2462 if (!EQ (p
->childp
, Qt
))
2463 error ("Process %s is not a subprocess",
2464 XSTRING (p
->name
)->data
);
2465 if (XINT (p
->infd
) < 0)
2466 error ("Process %s is not active",
2467 XSTRING (p
->name
)->data
);
2469 if (NILP (p
->pty_flag
))
2470 current_group
= Qnil
;
2472 /* If we are using pgrps, get a pgrp number and make it negative. */
2473 if (!NILP (current_group
))
2475 #ifdef SIGNALS_VIA_CHARACTERS
2476 /* If possible, send signals to the entire pgrp
2477 by sending an input character to it. */
2479 /* TERMIOS is the latest and bestest, and seems most likely to
2480 work. If the system has it, use it. */
2487 tcgetattr (XINT (p
->infd
), &t
);
2488 send_process (proc
, &t
.c_cc
[VINTR
], 1);
2492 tcgetattr (XINT (p
->infd
), &t
);
2493 send_process (proc
, &t
.c_cc
[VQUIT
], 1);
2497 tcgetattr (XINT (p
->infd
), &t
);
2498 #if defined (VSWTCH) && !defined (IRIX5)
2499 send_process (proc
, &t
.c_cc
[VSWTCH
], 1);
2501 send_process (proc
, &t
.c_cc
[VSUSP
], 1);
2506 #else /* ! HAVE_TERMIOS */
2508 /* On Berkeley descendants, the following IOCTL's retrieve the
2509 current control characters. */
2510 #if defined (TIOCGLTC) && defined (TIOCGETC)
2518 ioctl (XINT (p
->infd
), TIOCGETC
, &c
);
2519 send_process (proc
, &c
.t_intrc
, 1);
2522 ioctl (XINT (p
->infd
), TIOCGETC
, &c
);
2523 send_process (proc
, &c
.t_quitc
, 1);
2527 ioctl (XINT (p
->infd
), TIOCGLTC
, &lc
);
2528 send_process (proc
, &lc
.t_suspc
, 1);
2530 #endif /* ! defined (SIGTSTP) */
2533 #else /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
2535 /* On SYSV descendants, the TCGETA ioctl retrieves the current control
2542 ioctl (XINT (p
->infd
), TCGETA
, &t
);
2543 send_process (proc
, &t
.c_cc
[VINTR
], 1);
2546 ioctl (XINT (p
->infd
), TCGETA
, &t
);
2547 send_process (proc
, &t
.c_cc
[VQUIT
], 1);
2551 ioctl (XINT (p
->infd
), TCGETA
, &t
);
2552 send_process (proc
, &t
.c_cc
[VSWTCH
], 1);
2554 #endif /* ! defined (SIGTSTP) */
2556 #else /* ! defined (TCGETA) */
2557 Your configuration files are messed up
.
2558 /* If your system configuration files define SIGNALS_VIA_CHARACTERS,
2559 you'd better be using one of the alternatives above! */
2560 #endif /* ! defined (TCGETA) */
2561 #endif /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
2562 #endif /* ! defined HAVE_TERMIOS */
2563 #endif /* ! defined (SIGNALS_VIA_CHARACTERS) */
2566 /* Get the pgrp using the tty itself, if we have that.
2567 Otherwise, use the pty to get the pgrp.
2568 On pfa systems, saka@pfu.fujitsu.co.JP writes:
2569 "TIOCGPGRP symbol defined in sys/ioctl.h at E50.
2570 But, TIOCGPGRP does not work on E50 ;-P works fine on E60"
2571 His patch indicates that if TIOCGPGRP returns an error, then
2572 we should just assume that p->pid is also the process group id. */
2576 if (!NILP (p
->subtty
))
2577 err
= ioctl (XFASTINT (p
->subtty
), TIOCGPGRP
, &gid
);
2579 err
= ioctl (XINT (p
->infd
), TIOCGPGRP
, &gid
);
2583 gid
= - XFASTINT (p
->pid
);
2584 #endif /* ! defined (pfa) */
2590 #else /* ! defined (TIOCGPGRP ) */
2591 /* Can't select pgrps on this system, so we know that
2592 the child itself heads the pgrp. */
2593 gid
= - XFASTINT (p
->pid
);
2594 #endif /* ! defined (TIOCGPGRP ) */
2597 gid
= - XFASTINT (p
->pid
);
2603 p
->raw_status_low
= Qnil
;
2604 p
->raw_status_high
= Qnil
;
2606 XSETINT (p
->tick
, ++process_tick
);
2610 #endif /* ! defined (SIGCONT) */
2613 send_process (proc
, "\003", 1); /* ^C */
2618 send_process (proc
, "\031", 1); /* ^Y */
2623 sys$
forcex (&(XFASTINT (p
->pid
)), 0, 1);
2626 flush_pending_output (XINT (p
->infd
));
2630 /* If we don't have process groups, send the signal to the immediate
2631 subprocess. That isn't really right, but it's better than any
2632 obvious alternative. */
2635 kill (XFASTINT (p
->pid
), signo
);
2639 /* gid may be a pid, or minus a pgrp's number */
2641 if (!NILP (current_group
))
2642 ioctl (XINT (p
->infd
), TIOCSIGSEND
, signo
);
2645 gid
= - XFASTINT (p
->pid
);
2648 #else /* ! defined (TIOCSIGSEND) */
2649 EMACS_KILLPG (-gid
, signo
);
2650 #endif /* ! defined (TIOCSIGSEND) */
2653 DEFUN ("interrupt-process", Finterrupt_process
, Sinterrupt_process
, 0, 2, 0,
2654 "Interrupt process PROCESS. May be process or name of one.\n\
2655 PROCESS may be a process, a buffer, or the name of a process or buffer.\n\
2656 Nil or no arg means current buffer's process.\n\
2657 Second arg CURRENT-GROUP non-nil means send signal to\n\
2658 the current process-group of the process's controlling terminal\n\
2659 rather than to the process's own process group.\n\
2660 If the process is a shell, this means interrupt current subjob\n\
2661 rather than the shell.")
2662 (process
, current_group
)
2663 Lisp_Object process
, current_group
;
2665 process_send_signal (process
, SIGINT
, current_group
, 0);
2669 DEFUN ("kill-process", Fkill_process
, Skill_process
, 0, 2, 0,
2670 "Kill process PROCESS. May be process or name of one.\n\
2671 See function `interrupt-process' for more details on usage.")
2672 (process
, current_group
)
2673 Lisp_Object process
, current_group
;
2675 process_send_signal (process
, SIGKILL
, current_group
, 0);
2679 DEFUN ("quit-process", Fquit_process
, Squit_process
, 0, 2, 0,
2680 "Send QUIT signal to process PROCESS. May be process or name of one.\n\
2681 See function `interrupt-process' for more details on usage.")
2682 (process
, current_group
)
2683 Lisp_Object process
, current_group
;
2685 process_send_signal (process
, SIGQUIT
, current_group
, 0);
2689 DEFUN ("stop-process", Fstop_process
, Sstop_process
, 0, 2, 0,
2690 "Stop process PROCESS. May be process or name of one.\n\
2691 See function `interrupt-process' for more details on usage.")
2692 (process
, current_group
)
2693 Lisp_Object process
, current_group
;
2696 error ("no SIGTSTP support");
2698 process_send_signal (process
, SIGTSTP
, current_group
, 0);
2703 DEFUN ("continue-process", Fcontinue_process
, Scontinue_process
, 0, 2, 0,
2704 "Continue process PROCESS. May be process or name of one.\n\
2705 See function `interrupt-process' for more details on usage.")
2706 (process
, current_group
)
2707 Lisp_Object process
, current_group
;
2710 process_send_signal (process
, SIGCONT
, current_group
, 0);
2712 error ("no SIGCONT support");
2717 DEFUN ("signal-process", Fsignal_process
, Ssignal_process
,
2718 2, 2, "nProcess number: \nnSignal code: ",
2719 "Send the process with number PID the signal with code CODE.\n\
2720 Both PID and CODE are integers.")
2722 Lisp_Object pid
, sig
;
2724 CHECK_NUMBER (pid
, 0);
2725 CHECK_NUMBER (sig
, 1);
2726 return make_number (kill (XINT (pid
), XINT (sig
)));
2729 DEFUN ("process-send-eof", Fprocess_send_eof
, Sprocess_send_eof
, 0, 1, 0,
2730 "Make PROCESS see end-of-file in its input.\n\
2731 Eof comes after any text already sent to it.\n\
2732 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
2733 nil, indicating the current buffer's process.")
2735 Lisp_Object process
;
2739 proc
= get_process (process
);
2741 /* Make sure the process is really alive. */
2742 if (! NILP (XPROCESS (proc
)->raw_status_low
))
2743 update_status (XPROCESS (proc
));
2744 if (! EQ (XPROCESS (proc
)->status
, Qrun
))
2745 error ("Process %s not running", XSTRING (XPROCESS (proc
)->name
)->data
);
2747 /* Sending a zero-length record is supposed to mean eof
2748 when TIOCREMOTE is turned on. */
2752 write (XINT (XPROCESS (proc
)->outfd
), buf
, 0);
2754 #else /* did not do TOICREMOTE */
2756 send_process (proc
, "\032", 1); /* ^z */
2758 if (!NILP (XPROCESS (proc
)->pty_flag
))
2759 send_process (proc
, "\004", 1);
2762 close (XINT (XPROCESS (proc
)->outfd
));
2763 XSET (XPROCESS (proc
)->outfd
, Lisp_Int
, open (NULL_DEVICE
, O_WRONLY
));
2766 #endif /* did not do TOICREMOTE */
2770 /* Kill all processes associated with `buffer'.
2771 If `buffer' is nil, kill all processes */
2773 kill_buffer_processes (buffer
)
2776 Lisp_Object tail
, proc
;
2778 for (tail
= Vprocess_alist
; XGCTYPE (tail
) == Lisp_Cons
;
2779 tail
= XCONS (tail
)->cdr
)
2781 proc
= XCONS (XCONS (tail
)->car
)->cdr
;
2782 if (XGCTYPE (proc
) == Lisp_Process
2783 && (NILP (buffer
) || EQ (XPROCESS (proc
)->buffer
, buffer
)))
2785 if (NETCONN_P (proc
))
2786 deactivate_process (proc
);
2787 else if (XINT (XPROCESS (proc
)->infd
) >= 0)
2788 process_send_signal (proc
, SIGHUP
, Qnil
, 1);
2793 /* On receipt of a signal that a child status has changed,
2794 loop asking about children with changed statuses until
2795 the system says there are no more.
2796 All we do is change the status;
2797 we do not run sentinels or print notifications.
2798 That is saved for the next time keyboard input is done,
2799 in order to avoid timing errors. */
2801 /** WARNING: this can be called during garbage collection.
2802 Therefore, it must not be fooled by the presence of mark bits in
2805 /** USG WARNING: Although it is not obvious from the documentation
2806 in signal(2), on a USG system the SIGCLD handler MUST NOT call
2807 signal() before executing at least one wait(), otherwise the handler
2808 will be called again, resulting in an infinite loop. The relevant
2809 portion of the documentation reads "SIGCLD signals will be queued
2810 and the signal-catching function will be continually reentered until
2811 the queue is empty". Invoking signal() causes the kernel to reexamine
2812 the SIGCLD queue. Fred Fish, UniSoft Systems Inc. */
2815 sigchld_handler (signo
)
2818 int old_errno
= errno
;
2820 register struct Lisp_Process
*p
;
2821 extern EMACS_TIME
*input_available_clear_time
;
2825 sigheld
|= sigbit (SIGCHLD
);
2837 #endif /* no WUNTRACED */
2838 /* Keep trying to get a status until we get a definitive result. */
2842 pid
= wait3 (&w
, WNOHANG
| WUNTRACED
, 0);
2844 while (pid
<= 0 && errno
== EINTR
);
2848 /* A real failure. We have done all our job, so return. */
2850 /* USG systems forget handlers when they are used;
2851 must reestablish each time */
2853 signal (signo
, sigchld_handler
); /* WARNING - must come after wait3() */
2856 sigheld
&= ~sigbit (SIGCHLD
);
2864 #endif /* no WNOHANG */
2866 /* Find the process that signaled us, and record its status. */
2869 for (tail
= Vprocess_alist
; XSYMBOL (tail
) != XSYMBOL (Qnil
); tail
= XCONS (tail
)->cdr
)
2871 proc
= XCONS (XCONS (tail
)->car
)->cdr
;
2872 p
= XPROCESS (proc
);
2873 if (EQ (p
->childp
, Qt
) && XFASTINT (p
->pid
) == pid
)
2878 /* Look for an asynchronous process whose pid hasn't been filled
2881 for (tail
= Vprocess_alist
; XSYMBOL (tail
) != XSYMBOL (Qnil
); tail
= XCONS (tail
)->cdr
)
2883 proc
= XCONS (XCONS (tail
)->car
)->cdr
;
2884 p
= XPROCESS (proc
);
2885 if (XTYPE (p
->pid
) == Lisp_Int
&& XINT (p
->pid
) == -1)
2890 /* Change the status of the process that was found. */
2893 union { int i
; WAITTYPE wt
; } u
;
2895 XSETINT (p
->tick
, ++process_tick
);
2897 XFASTINT (p
->raw_status_low
) = u
.i
& 0xffff;
2898 XFASTINT (p
->raw_status_high
) = u
.i
>> 16;
2900 /* If process has terminated, stop waiting for its output. */
2901 if (WIFSIGNALED (w
) || WIFEXITED (w
))
2902 if (XINT (p
->infd
) >= 0)
2903 FD_CLR (XINT (p
->infd
), &input_wait_mask
);
2905 /* Tell wait_reading_process_input that it needs to wake up and
2907 if (input_available_clear_time
)
2908 EMACS_SET_SECS_USECS (*input_available_clear_time
, 0, 0);
2911 /* There was no asynchronous process found for that id. Check
2912 if we have a synchronous process. */
2915 synch_process_alive
= 0;
2917 /* Report the status of the synchronous process. */
2919 synch_process_retcode
= WRETCODE (w
);
2920 else if (WIFSIGNALED (w
))
2922 int code
= WTERMSIG (w
);
2928 signame
= sys_siglist
[code
];
2930 signame
= sys_errlist
[code
];
2934 signame
= "unknown";
2936 synch_process_death
= signame
;
2939 /* Tell wait_reading_process_input that it needs to wake up and
2941 if (input_available_clear_time
)
2942 EMACS_SET_SECS_USECS (*input_available_clear_time
, 0, 0);
2945 /* On some systems, we must return right away.
2946 If any more processes want to signal us, we will
2948 Otherwise (on systems that have WNOHANG), loop around
2949 to use up all the processes that have something to tell us. */
2950 #if defined (USG) && ! (defined (HPUX) && defined (WNOHANG))
2952 signal (signo
, sigchld_handler
);
2956 #endif /* USG, but not HPUX with WNOHANG */
2962 exec_sentinel_unwind (data
)
2965 XPROCESS (XCONS (data
)->car
)->sentinel
= XCONS (data
)->cdr
;
2970 exec_sentinel (proc
, reason
)
2971 Lisp_Object proc
, reason
;
2973 Lisp_Object sentinel
;
2974 register struct Lisp_Process
*p
= XPROCESS (proc
);
2975 int count
= specpdl_ptr
- specpdl
;
2977 sentinel
= p
->sentinel
;
2978 if (NILP (sentinel
))
2981 /* Zilch the sentinel while it's running, to avoid recursive invocations;
2982 assure that it gets restored no matter how the sentinel exits. */
2984 record_unwind_protect (exec_sentinel_unwind
, Fcons (proc
, sentinel
));
2985 /* Inhibit quit so that random quits don't screw up a running filter. */
2986 specbind (Qinhibit_quit
, Qt
);
2987 call2 (sentinel
, proc
, reason
);
2988 unbind_to (count
, Qnil
);
2991 /* Report all recent events of a change in process status
2992 (either run the sentinel or output a message).
2993 This is done while Emacs is waiting for keyboard input. */
2997 register Lisp_Object proc
, buffer
;
2998 Lisp_Object tail
, msg
;
2999 struct gcpro gcpro1
, gcpro2
;
3003 /* We need to gcpro tail; if read_process_output calls a filter
3004 which deletes a process and removes the cons to which tail points
3005 from Vprocess_alist, and then causes a GC, tail is an unprotected
3009 for (tail
= Vprocess_alist
; !NILP (tail
); tail
= Fcdr (tail
))
3012 register struct Lisp_Process
*p
;
3014 proc
= Fcdr (Fcar (tail
));
3015 p
= XPROCESS (proc
);
3017 if (XINT (p
->tick
) != XINT (p
->update_tick
))
3019 XSETINT (p
->update_tick
, XINT (p
->tick
));
3021 /* If process is still active, read any output that remains. */
3022 if (XINT (p
->infd
) >= 0)
3023 while (! EQ (p
->filter
, Qt
)
3024 && read_process_output (proc
, XINT (p
->infd
)) > 0);
3028 /* Get the text to use for the message. */
3029 if (!NILP (p
->raw_status_low
))
3031 msg
= status_message (p
->status
);
3033 /* If process is terminated, deactivate it or delete it. */
3035 if (XTYPE (p
->status
) == Lisp_Cons
)
3036 symbol
= XCONS (p
->status
)->car
;
3038 if (EQ (symbol
, Qsignal
) || EQ (symbol
, Qexit
)
3039 || EQ (symbol
, Qclosed
))
3041 if (delete_exited_processes
)
3042 remove_process (proc
);
3044 deactivate_process (proc
);
3047 /* Now output the message suitably. */
3048 if (!NILP (p
->sentinel
))
3049 exec_sentinel (proc
, msg
);
3050 /* Don't bother with a message in the buffer
3051 when a process becomes runnable. */
3052 else if (!EQ (symbol
, Qrun
) && !NILP (buffer
))
3054 Lisp_Object ro
, tem
;
3055 struct buffer
*old
= current_buffer
;
3058 ro
= XBUFFER (buffer
)->read_only
;
3060 /* Avoid error if buffer is deleted
3061 (probably that's why the process is dead, too) */
3062 if (NILP (XBUFFER (buffer
)->name
))
3064 Fset_buffer (buffer
);
3066 /* Insert new output into buffer
3067 at the current end-of-output marker,
3068 thus preserving logical ordering of input and output. */
3069 if (XMARKER (p
->mark
)->buffer
)
3070 SET_PT (marker_position (p
->mark
));
3073 if (point
<= opoint
)
3074 opoint
+= XSTRING (msg
)->size
+ XSTRING (p
->name
)->size
+ 10;
3076 tem
= current_buffer
->read_only
;
3077 current_buffer
->read_only
= Qnil
;
3078 insert_string ("\nProcess ");
3079 Finsert (1, &p
->name
);
3080 insert_string (" ");
3082 current_buffer
->read_only
= tem
;
3083 Fset_marker (p
->mark
, make_number (point
), p
->buffer
);
3086 set_buffer_internal (old
);
3091 update_mode_lines
++; /* in case buffers use %s in mode-line-format */
3092 redisplay_preserve_echo_area ();
3094 update_tick
= process_tick
;
3105 if (! noninteractive
|| initialized
)
3107 signal (SIGCHLD
, sigchld_handler
);
3110 FD_ZERO (&input_wait_mask
);
3111 max_process_desc
= 0;
3113 keyboard_descriptor
= 0;
3114 FD_SET (keyboard_descriptor
, &input_wait_mask
);
3116 Vprocess_alist
= Qnil
;
3117 for (i
= 0; i
< MAXDESC
; i
++)
3119 chan_process
[i
] = Qnil
;
3120 proc_buffered_char
[i
] = -1;
3124 /* From now on, assume keyboard input comes from descriptor DESC. */
3127 change_keyboard_wait_descriptor (desc
)
3130 FD_CLR (keyboard_descriptor
, &input_wait_mask
);
3131 keyboard_descriptor
= desc
;
3132 FD_SET (keyboard_descriptor
, &input_wait_mask
);
3138 stream_process
= intern ("stream");
3140 Qprocessp
= intern ("processp");
3141 staticpro (&Qprocessp
);
3142 Qrun
= intern ("run");
3144 Qstop
= intern ("stop");
3146 Qsignal
= intern ("signal");
3147 staticpro (&Qsignal
);
3149 /* Qexit is already staticpro'd by syms_of_eval; don't staticpro it
3152 Qexit = intern ("exit");
3153 staticpro (&Qexit); */
3155 Qopen
= intern ("open");
3157 Qclosed
= intern ("closed");
3158 staticpro (&Qclosed
);
3160 staticpro (&Vprocess_alist
);
3162 DEFVAR_BOOL ("delete-exited-processes", &delete_exited_processes
,
3163 "*Non-nil means delete processes immediately when they exit.\n\
3164 nil means don't delete them until `list-processes' is run.");
3166 delete_exited_processes
= 1;
3168 DEFVAR_LISP ("process-connection-type", &Vprocess_connection_type
,
3169 "Control type of device used to communicate with subprocesses.\n\
3170 Values are nil to use a pipe, and t or 'pty for a pty. Note that if\n\
3171 pty's are not available, this variable will be ignored. The value takes\n\
3172 effect when `start-process' is called.");
3173 Vprocess_connection_type
= Qt
;
3175 defsubr (&Sprocessp
);
3176 defsubr (&Sget_process
);
3177 defsubr (&Sget_buffer_process
);
3178 defsubr (&Sdelete_process
);
3179 defsubr (&Sprocess_status
);
3180 defsubr (&Sprocess_exit_status
);
3181 defsubr (&Sprocess_id
);
3182 defsubr (&Sprocess_name
);
3183 defsubr (&Sprocess_command
);
3184 defsubr (&Sset_process_buffer
);
3185 defsubr (&Sprocess_buffer
);
3186 defsubr (&Sprocess_mark
);
3187 defsubr (&Sset_process_filter
);
3188 defsubr (&Sprocess_filter
);
3189 defsubr (&Sset_process_sentinel
);
3190 defsubr (&Sset_process_window_size
);
3191 defsubr (&Sprocess_sentinel
);
3192 defsubr (&Sprocess_kill_without_query
);
3193 defsubr (&Slist_processes
);
3194 defsubr (&Sprocess_list
);
3195 defsubr (&Sstart_process
);
3197 defsubr (&Sopen_network_stream
);
3198 #endif /* HAVE_SOCKETS */
3199 defsubr (&Saccept_process_output
);
3200 defsubr (&Sprocess_send_region
);
3201 defsubr (&Sprocess_send_string
);
3202 defsubr (&Sinterrupt_process
);
3203 defsubr (&Skill_process
);
3204 defsubr (&Squit_process
);
3205 defsubr (&Sstop_process
);
3206 defsubr (&Scontinue_process
);
3207 defsubr (&Sprocess_send_eof
);
3208 defsubr (&Ssignal_process
);
3209 defsubr (&Swaiting_for_user_input_p
);
3210 /* defsubr (&Sprocess_connection); */
3214 #else /* not subprocesses */
3216 #include <sys/types.h>
3220 #include "systime.h"
3221 #include "termopts.h"
3223 extern int frame_garbaged
;
3226 /* As described above, except assuming that there are no subprocesses:
3228 Wait for timeout to elapse and/or keyboard input to be available.
3231 timeout in seconds, or
3232 zero for no limit, or
3233 -1 means gobble data immediately available but don't wait for any.
3235 read_kbd is a Lisp_Object:
3236 0 to ignore keyboard input, or
3237 1 to return when input is available, or
3238 -1 means caller will actually read the input, so don't throw to
3240 We know that read_kbd will never be a Lisp_Process, since
3241 `subprocesses' isn't defined.
3243 do_display != 0 means redisplay should be done to show subprocess
3244 output that arrives.
3246 Return true iff we received input from any process. */
3249 wait_reading_process_input (time_limit
, microsecs
, read_kbd
, do_display
)
3250 int time_limit
, microsecs
;
3251 Lisp_Object read_kbd
;
3254 EMACS_TIME end_time
, timeout
, *timeout_p
;
3257 /* What does time_limit really mean? */
3258 if (time_limit
|| microsecs
)
3260 /* It's not infinite. */
3261 timeout_p
= &timeout
;
3263 if (time_limit
== -1)
3264 /* In fact, it's zero. */
3265 EMACS_SET_SECS_USECS (timeout
, 0, 0);
3267 EMACS_SET_SECS_USECS (timeout
, time_limit
, microsecs
);
3269 /* How far in the future is that? */
3270 EMACS_GET_TIME (end_time
);
3271 EMACS_ADD_TIME (end_time
, end_time
, timeout
);
3274 /* It's infinite. */
3277 /* This must come before stop_polling. */
3278 prepare_menu_bars ();
3280 /* Turn off periodic alarms (in case they are in use)
3281 because the select emulator uses alarms. */
3288 waitchannels
= XINT (read_kbd
) ? 1 : 0;
3290 /* If calling from keyboard input, do not quit
3291 since we want to return C-g as an input character.
3292 Otherwise, do pending quit if requested. */
3293 if (XINT (read_kbd
) >= 0)
3298 EMACS_GET_TIME (*timeout_p
);
3299 EMACS_SUB_TIME (*timeout_p
, end_time
, *timeout_p
);
3300 if (EMACS_TIME_NEG_P (*timeout_p
))
3304 /* Cause C-g and alarm signals to take immediate action,
3305 and cause input available signals to zero out timeout. */
3306 if (XINT (read_kbd
) < 0)
3307 set_waiting_for_input (&timeout
);
3309 /* If a frame has been newly mapped and needs updating,
3310 reprocess its display stuff. */
3311 if (frame_garbaged
&& do_display
)
3312 redisplay_preserve_echo_area ();
3314 if (XINT (read_kbd
) && detect_input_pending ())
3317 nfds
= select (1, &waitchannels
, 0, 0, timeout_p
);
3319 /* Make C-g and alarm signals set flags again */
3320 clear_waiting_for_input ();
3322 /* If we woke up due to SIGWINCH, actually change size now. */
3323 do_pending_window_change ();
3327 /* If the system call was interrupted, then go around the
3333 else if (nfds
> 0 && (waitchannels
& 1) && interrupt_input
)
3334 /* System sometimes fails to deliver SIGIO. */
3335 kill (getpid (), SIGIO
);
3338 if (XINT (read_kbd
) && interrupt_input
&& (waitchannels
& 1))
3342 /* If we have timed out (nfds == 0) or found some input (nfds > 0),
3354 DEFUN ("get-buffer-process", Fget_buffer_process
, Sget_buffer_process
, 1, 1, 0,
3355 /* Don't confuse make-docfile by having two doc strings for this function.
3356 make-docfile does not pay attention to #if, for good reason! */
3359 register Lisp_Object name
;
3364 /* Kill all processes associated with `buffer'.
3365 If `buffer' is nil, kill all processes.
3366 Since we have no subprocesses, this does nothing. */
3368 kill_buffer_processes (buffer
)
3379 defsubr (&Sget_buffer_process
);
3383 #endif /* not subprocesses */