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+/* Definitions for asynchronous process control in GNU Emacs.
+   Copyright (C) 1985 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 1, 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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+
+/*
+ * Structure records pertinent information about open channels.
+ * There is one channel associated with each process.
+ */
+
+struct Lisp_Process
+  {
+    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 this process */
+    Lisp_Object name;
+    /* List of command arguments that this process was run with */
+    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;
+    /* 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;
+    /* Non-nil if this is really a child 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.  */
+    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;
+};
+
+#define ChannelMask(n) (1<<(n))
+
+/* True iff we are about to fork off a synchronous process or if we
+   are waiting for it.  */
+extern int synch_process_alive;
+
+/* 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;
+