| 1 | /* Definitions for asynchronous process control in GNU Emacs. |
| 2 | Copyright (C) 1985 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GNU Emacs. |
| 5 | |
| 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 1, or (at your option) |
| 9 | any later version. |
| 10 | |
| 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. |
| 15 | |
| 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. */ |
| 19 | |
| 20 | |
| 21 | /* |
| 22 | * Structure records pertinent information about open channels. |
| 23 | * There is one channel associated with each process. |
| 24 | */ |
| 25 | |
| 26 | struct Lisp_Process |
| 27 | { |
| 28 | int size; |
| 29 | struct Lisp_Vector *v_next; |
| 30 | /* Descriptor by which we read from this process */ |
| 31 | Lisp_Object infd; |
| 32 | /* Descriptor by which we write to this process */ |
| 33 | Lisp_Object outfd; |
| 34 | /* Descriptor for the tty which this process is using. |
| 35 | nil if we didn't record it (on some systems, there's no need). */ |
| 36 | Lisp_Object subtty; |
| 37 | /* Name of this process */ |
| 38 | Lisp_Object name; |
| 39 | /* List of command arguments that this process was run with */ |
| 40 | Lisp_Object command; |
| 41 | /* (funcall FILTER PROC STRING) (if FILTER is non-nil) |
| 42 | to dispose of a bunch of chars from the process all at once */ |
| 43 | Lisp_Object filter; |
| 44 | /* (funcall SENTINEL PROCESS) when process state changes */ |
| 45 | Lisp_Object sentinel; |
| 46 | /* Buffer that output is going to */ |
| 47 | Lisp_Object buffer; |
| 48 | /* Number of this process */ |
| 49 | Lisp_Object pid; |
| 50 | /* Non-nil if this is really a command channel */ |
| 51 | Lisp_Object command_channel_p; |
| 52 | /* Non-nil if this is really a child process */ |
| 53 | Lisp_Object childp; |
| 54 | /* Marker set to end of last buffer-inserted output from this process */ |
| 55 | Lisp_Object mark; |
| 56 | /* Non-nil means kill silently if Emacs is exited. */ |
| 57 | Lisp_Object kill_without_query; |
| 58 | /* Record the process status in the raw form in which it comes from `wait'. |
| 59 | This is to avoid consing in a signal handler. */ |
| 60 | Lisp_Object raw_status_low; |
| 61 | Lisp_Object raw_status_high; |
| 62 | /* Symbol indicating status of process. |
| 63 | This may be a symbol: run, open, or closed. |
| 64 | Or it may be a list, whose car is stop, exit or signal |
| 65 | and whose cdr is a pair (EXIT_CODE . COREDUMP_FLAG) |
| 66 | or (SIGNAL_NUMBER . COREDUMP_FLAG). */ |
| 67 | Lisp_Object status; |
| 68 | /* Non-nil if communicating through a pty. */ |
| 69 | Lisp_Object pty_flag; |
| 70 | /* Event-count of last event in which this process changed status. */ |
| 71 | Lisp_Object tick; |
| 72 | /* Event-count of last such event reported. */ |
| 73 | Lisp_Object update_tick; |
| 74 | }; |
| 75 | |
| 76 | #define ChannelMask(n) (1<<(n)) |
| 77 | |
| 78 | /* Indexed by descriptor, gives the process (if any) for that descriptor. */ |
| 79 | extern Lisp_Object chan_process[]; |
| 80 | |
| 81 | /* Alist of elements (NAME . PROCESS). */ |
| 82 | extern Lisp_Object Vprocess_alist; |
| 83 | |
| 84 | /* True iff we are about to fork off a synchronous process or if we |
| 85 | are waiting for it. */ |
| 86 | extern int synch_process_alive; |
| 87 | |
| 88 | /* Communicate exit status of synch process to from sigchld_handler |
| 89 | to Fcall_process. */ |
| 90 | extern int synch_process_retcode; |
| 91 | extern char *synch_process_death; |
| 92 | |
| 93 | /* Nonzero => this is a string explaining death of synchronous subprocess. */ |
| 94 | extern char *synch_process_death; |
| 95 | |
| 96 | /* If synch_process_death is zero, |
| 97 | this is exit code of synchronous subprocess. */ |
| 98 | extern int synch_process_retcode; |
| 99 | |
| 100 | /* The name of the file open to get a null file, or a data sink. |
| 101 | VMS, MS-DOS, and OS/2 redefine this. */ |
| 102 | #ifndef NULL_DEVICE |
| 103 | #define NULL_DEVICE "/dev/null" |
| 104 | #endif |
| 105 | |
| 106 | /* A string listing the possible suffixes used for executable files, |
| 107 | separated by colons. VMS, MS-DOS, and OS/2 redefine this. */ |
| 108 | #ifndef EXEC_SUFFIXES |
| 109 | #define EXEC_SUFFIXES "" |
| 110 | #endif |