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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., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, 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;
    /* 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;
    /* 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;
    /* Plist for programs to keep per-process state information, parameters, etc.  */
    Lisp_Object plist;
    /* 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;
    /* 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;
    /* 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.
       On some systems, e.g. GNU/Linux, Emacs is seen as 
       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;
};

/* 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;

/* Nonzero => this is the signal number that terminated the subprocess.  */
extern int synch_process_termsig;

/* 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

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