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/* Definitions for asynchronous process control in GNU Emacs.
Copyright (C) 1985, 1994 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* This structure records information about a subprocess
or network connection.
Every field in this structure except for the first two
must be a Lisp_Object, for GC's sake. */
struct Lisp_Process
{
EMACS_INT size;
struct Lisp_Vector *v_next;
/* Descriptor by which we read from this process */
Lisp_Object infd;
/* Descriptor by which we write to this process */
Lisp_Object outfd;
/* Descriptor for the tty which this process is using.
nil if we didn't record it (on some systems, there's no need). */
Lisp_Object subtty;
/* Name of subprocess terminal. */
Lisp_Object tty_name;
/* Name of this process */
Lisp_Object name;
/* List of command arguments that this process was run with.
Is set to t for a stopped network process; nil otherwise. */
Lisp_Object command;
/* (funcall FILTER PROC STRING) (if FILTER is non-nil)
to dispose of a bunch of chars from the process all at once */
Lisp_Object filter;
/* (funcall SENTINEL PROCESS) when process state changes */
Lisp_Object sentinel;
/* (funcall LOG SERVER CLIENT MESSAGE) when a server process
accepts a connection from a client. */
Lisp_Object log;
/* Buffer that output is going to */
Lisp_Object buffer;
/* Number of this process */
Lisp_Object pid;
/* Non-nil if this is really a command channel */
Lisp_Object command_channel_p;
/* t if this is a real child process.
For a net connection, it is a plist based on the arguments to make-network-process. */
Lisp_Object childp;
/* Marker set to end of last buffer-inserted output from this process */
Lisp_Object mark;
/* Non-nil means kill silently if Emacs is exited.
This is the inverse of the `query-on-exit' flag. */
Lisp_Object kill_without_query;
/* Record the process status in the raw form in which it comes from `wait'.
This is to avoid consing in a signal handler. */
Lisp_Object raw_status_low;
Lisp_Object raw_status_high;
/* Symbol indicating status of process.
This may be a symbol: run, open, or closed.
Or it may be a list, whose car is stop, exit or signal
and whose cdr is a pair (EXIT_CODE . COREDUMP_FLAG)
or (SIGNAL_NUMBER . COREDUMP_FLAG). */
Lisp_Object status;
/* Non-nil if communicating through a pty. */
Lisp_Object pty_flag;
/* Event-count of last event in which this process changed status. */
Lisp_Object tick;
/* Event-count of last such event reported. */
Lisp_Object update_tick;
/* Coding-system for decoding the input from this process. */
Lisp_Object decode_coding_system;
/* Working buffer for decoding. */
Lisp_Object decoding_buf;
/* Size of carryover in decoding. */
Lisp_Object decoding_carryover;
/* Coding-system for encoding the output to this process. */
Lisp_Object encode_coding_system;
/* Working buffer for encoding. */
Lisp_Object encoding_buf;
/* Size of carryover in encoding. */
Lisp_Object encoding_carryover;
/* Flag to set coding-system of the process buffer from the
coding_system used to decode process output. */
Lisp_Object inherit_coding_system_flag;
};
/* Every field in the preceding structure except for the first two
must be a Lisp_Object, for GC's sake. */
#define ChannelMask(n) (1<<(n))
/* Indexed by descriptor, gives the process (if any) for that descriptor. */
extern Lisp_Object chan_process[];
/* Alist of elements (NAME . PROCESS). */
extern Lisp_Object Vprocess_alist;
/* True iff we are about to fork off a synchronous process or if we
are waiting for it. */
extern int synch_process_alive;
/* Communicate exit status of sync process to from sigchld_handler
to Fcall_process. */
/* Nonzero => this is a string explaining death of synchronous subprocess. */
extern char *synch_process_death;
/* If synch_process_death is zero,
this is exit code of synchronous subprocess. */
extern int synch_process_retcode;
/* The name of the file open to get a null file, or a data sink.
VMS, MS-DOS, and OS/2 redefine this. */
#ifndef NULL_DEVICE
#define NULL_DEVICE "/dev/null"
#endif
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