process.h 6.54 KB
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/* Definitions for asynchronous process control in GNU Emacs.
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   Copyright (C) 1985, 1994, 2002, 2003, 2004,
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                 2005, 2006 Free Software Foundation, Inc.
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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
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the Free Software Foundation; either version 2, or (at your option)
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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
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.  */
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#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
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/* 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.  */
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struct Lisp_Process
  {
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    EMACS_INT size;
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    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;
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    /* Name of subprocess terminal.  */
    Lisp_Object tty_name;
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    /* Name of this process */
    Lisp_Object name;
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    /* List of command arguments that this process was run with.
       Is set to t for a stopped network process; nil otherwise. */
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    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;
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    /* (funcall LOG SERVER CLIENT MESSAGE) when a server process
       accepts a connection from a client.  */
    Lisp_Object log;
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    /* Buffer that output is going to */
    Lisp_Object buffer;
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    /* t if this is a real child process.
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       For a net connection, it is a plist based on the arguments to make-network-process.  */
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    Lisp_Object childp;
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    /* Plist for programs to keep per-process state information, parameters, etc.  */
    Lisp_Object plist;
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    /* Marker set to end of last buffer-inserted output from this process */
    Lisp_Object mark;
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    /* Non-nil means kill silently if Emacs is exited.
       This is the inverse of the `query-on-exit' flag.  */
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    Lisp_Object kill_without_query;
    /* 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;
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    /* Coding-system for decoding the input from this process.  */
    Lisp_Object decode_coding_system;
    /* Working buffer for decoding.  */
    Lisp_Object decoding_buf;
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    /* Size of carryover in decoding.  */
    Lisp_Object decoding_carryover;
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    /* Coding-system for encoding the output to this process.  */
    Lisp_Object encode_coding_system;
    /* Working buffer for encoding.  */
    Lisp_Object encoding_buf;
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    /* Size of carryover in encoding.  */
    Lisp_Object encoding_carryover;
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    /* Flag to set coding-system of the process buffer from the
       coding_system used to decode process output.  */
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    Lisp_Object inherit_coding_system_flag;
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    /* Flat to decide the multibyteness of a string given to the
       filter (if any).  It is initialized to the value of
       `default-enable-multibyte-characters' when the process is
       generated, and can be changed by the function
       `set-process-fileter-multibyte'. */
    Lisp_Object filter_multibyte;
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    /* Should we delay reading output from this process.
       Initialized from `Vprocess_adaptive_read_buffering'.  */
    Lisp_Object adaptive_read_buffering;
    /* Hysteresis to try to read process output in larger blocks.
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       On some systems, e.g. GNU/Linux, Emacs is seen as 
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       an interactive app also when reading process output, meaning
       that process output can be read in as little as 1 byte at a
       time.  Value is micro-seconds to delay reading output from
       this process.  Range is 0 .. 50000.  */
    Lisp_Object read_output_delay;
    /* Skip reading this process on next read.  */
    Lisp_Object read_output_skip;
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    /* After this point, there are no Lisp_Objects any more.  */

    /* Number of this process.
       allocate_process assumes this is the first non-Lisp_Object field.
       A value 0 is used for pseudo-processes such as network connections.  */
    pid_t pid;
    /* Record the process status in the raw form in which it comes from `wait'.
       This is to avoid consing in a signal handler.  The `raw_status_new'
       flag indicates that `raw_status' contains a new status that still
       needs to be synced to `status'.  */
    int raw_status_new : 1;
    int raw_status;
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};

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/* Every field in the preceding structure except for the first two
   must be a Lisp_Object, for GC's sake.  */

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#define ChannelMask(n) (1<<(n))

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/* Indexed by descriptor, gives the process (if any) for that descriptor.  */
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extern Lisp_Object chan_process[];
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/* Alist of elements (NAME . PROCESS).  */
extern Lisp_Object Vprocess_alist;

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/* True iff we are about to fork off a synchronous process or if we
   are waiting for it.  */
extern int synch_process_alive;

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/* Communicate exit status of sync process to from sigchld_handler
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   to Fcall_process.  */

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/* Nonzero => this is a string explaining death of synchronous subprocess.  */
extern char *synch_process_death;

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/* Nonzero => this is the signal number that terminated the subprocess.  */
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extern int synch_process_termsig;
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/* If synch_process_death is zero,
   this is exit code of synchronous subprocess.  */
extern int synch_process_retcode;

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/* 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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/* Nonzero means don't run process sentinels.  This is used
   when exiting.  */
extern int inhibit_sentinels;

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/* arch-tag: dffedfc4-d7bc-4b58-a26f-c16155449c72
   (do not change this comment) */