xemacs-beta: src/process.c comparison

comparison src/process.c @ 0:376386a54a3c r19-14

Import from CVS: tag r19-14

author	cvs
date	Mon, 13 Aug 2007 08:45:50 +0200
parents
children	0293115a14e9

comparison

equal deleted inserted replaced

--1:000000000000
+:376386a54a3c
+/* Asynchronous subprocess control for XEmacs.
+Copyright (C) 1985, 1986, 1987, 1988, 1992, 1993, 1994, 1995
+Free Software Foundation, Inc.
+Copyright (C) 1995 Sun Microsystems, Inc.
+Copyright (C) 1995, 1996 Ben Wing.
+This file is part of XEmacs.
+XEmacs 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.
+XEmacs 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 XEmacs; see the file COPYING.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+/* Synched up with: Mule 2.0, FSF 19.30. */
+/* This file has been Mule-ized except for `start-process-internal'
+and `open-network-stream-internal'. */
+#include <config.h>
+#if !defined (NO_SUBPROCESSES)
+/* The entire file is within this conditional */
+#include "lisp.h"
+#include "buffer.h"
+#include "commands.h"
+#include "events.h"
+#include "frame.h"
+#include "insdel.h"
+#include "lstream.h"
+#include "opaque.h"
+#include "process.h"
+#include "sysdep.h"
+#include "window.h"
+#include <setjmp.h>
+#include "sysfile.h"
+#include "sysproc.h"
+#include "systime.h"
+#include "syssignal.h" /* Always include before systty.h */
+#include "systty.h"
+#include "syswait.h"
+/* a process object is a network connection when its pid field a cons
+(name of name of port we are connected to . foreign host name) */
+/* Valid values of process->status_symbol */
+Lisp_Object Qrun, Qstop; /* Qexit from eval.c, Qsignal from data.c. */
+/* Qrun => Qopen, Qexit => Qclosed for "network connection" processes */
+Lisp_Object Qopen, Qclosed;
+/* t means use pty, nil means use a pipe,
+maybe other values to come.  */
+static Lisp_Object Vprocess_connection_type;
+/* FSFmacs says:
+These next two vars are non-static since sysdep.c uses them in the
+emulation of `select'.  */
+/* Number of events of change of status of a process.  */
+static volatile int process_tick;
+/* Number of events for which the user or sentinel has been notified.  */
+static int update_tick;
+/* Nonzero means delete a process right away if it exits.  */
+int delete_exited_processes;
+/* Indexed by descriptor, gives the process (if any) for that descriptor */
+Lisp_Object descriptor_to_process[MAXDESC];
+/* List of process objects. */
+Lisp_Object Vprocess_list;
+Lisp_Object Qprocessp;
+/* Buffered-ahead input char from process, indexed by channel.
+-1 means empty (no char is buffered).
+Used on sys V where the only way to tell if there is any
+output from the process is to read at least one char.
+Always -1 on systems that support FIONREAD.  */
+/* FSFmacs says:
+Don't make static; need to access externally.  */
+static int proc_buffered_char[MAXDESC];
+#ifdef HAVE_PTYS
+/* The file name of the pty opened by allocate_pty.  */
+static char pty_name[24];
+#endif
+/************************************************************************/
+/*                        the process Lisp object                       */
+/************************************************************************/
+/*
+* Structure records pertinent information about open channels.
+* There is one channel associated with each process.
+*/
+struct Lisp_Process
+{
+struct lcrecord_header header;
+/* 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;
+/* Marker set to end of last buffer-inserted output from this process */
+Lisp_Object mark;
+/* Lisp_Int of subprocess' PID, or a cons of
+service/host if this is really a network connection */
+Lisp_Object pid;
+/* Non-0 if this is really a ToolTalk channel. */
+int connected_via_filedesc_p;
+#if 0 /* FSFmacs */
+/* Perhaps it's cleaner this way, but FSFmacs
+provides no way of retrieving this value, so I'll
+leave this info with PID. */
+/* Non-nil if this is really a child process */
+Lisp_Object childp;
+#endif
+/* Symbol indicating status of process.
+This may be a symbol: run, stop, exit, signal */
+Lisp_Object status_symbol;
+/* Exit code if process has terminated,
+signal which stopped/interrupted process
+or 0 if process is running */
+int exit_code;
+/* Number of this process */
+/* Non-false if process has exited and "dumped core" on its way down */
+char core_dumped;
+/* Descriptor by which we read from this process.  -1 for dead process */
+int infd;
+/* Descriptor by which we write to this process. -1 for dead process */
+int outfd;
+/* Descriptor for the tty which this process is using.
+-1 if we didn't record it (on some systems, there's no need).  */
+int subtty;
+/* Name of subprocess terminal. */
+Lisp_Object tty_name;
+/* Non-false if communicating through a pty.  */
+char pty_flag;
+/* This next field is only actually used #ifdef ENERGIZE */
+/* if this flag is not NIL, then filter will do the read on the
+channel, rather than having a call to make_string.
+This only works if the filter is a subr. */
+char filter_does_read;
+/* Non-nil means kill silently if Emacs is exited.  */
+char kill_without_query;
+char selected;
+/* Event-count of last event in which this process changed status.  */
+volatile int tick;
+/* Event-count of last such event reported.  */
+int update_tick;
+/* streams used in input and output */
+Lisp_Object instream;
+Lisp_Object outstream;
+/* The actual filedesc stream used for output; may be different
+than OUTSTREAM under Mule */
+Lisp_Object filedesc_stream;
+};
+static Lisp_Object mark_process (Lisp_Object, void (*) (Lisp_Object));
+static void print_process (Lisp_Object, Lisp_Object, int);
+static void finalize_process (void *, int);
+DEFINE_LRECORD_IMPLEMENTATION ("process", process,
+mark_process, print_process, finalize_process,
+0, 0, struct Lisp_Process);
+static Lisp_Object
+mark_process (Lisp_Object obj, void (*markobj) (Lisp_Object))
+{
+struct Lisp_Process *proc = XPROCESS (obj);
+((markobj) (proc->name));
+((markobj) (proc->command));
+((markobj) (proc->filter));
+((markobj) (proc->sentinel));
+((markobj) (proc->buffer));
+((markobj) (proc->mark));
+((markobj) (proc->pid));
+((markobj) (proc->tty_name));
+((markobj) (proc->instream));
+((markobj) (proc->outstream));
+((markobj) (proc->filedesc_stream));
+return (proc->status_symbol);
+}
+static void
+print_process (Lisp_Object obj, Lisp_Object printcharfun, int escapeflag)
+{
+struct Lisp_Process *proc = XPROCESS (obj);
+if (print_readably)
+error ("printing unreadable object #<process %s>",
+string_data (XSTRING (proc->name)));
+if (!escapeflag)
+{
+print_internal (proc->name, printcharfun, 0);
+}
+else
+{
+int netp = network_connection_p (obj);
+write_c_string (((netp) ? GETTEXT ("#<network connection ") :
+		       GETTEXT ("#<process ")), printcharfun);
+print_internal (proc->name, printcharfun, 1);
+write_c_string (((netp) ? " " : " pid "), printcharfun);
+print_internal (proc->pid, printcharfun, 1);
+write_c_string (" state:", printcharfun);
+print_internal (proc->status_symbol, printcharfun, 1);
+write_c_string (">", printcharfun);
+}
+}
+#ifdef HAVE_WINDOW_SYSTEM
+extern void debug_process_finalization (struct Lisp_Process *p);
+#endif /* HAVE_WINDOW_SYSTEM */
+static void
+finalize_process (void *header, int for_disksave)
+{
+if (for_disksave) return; /* hmm, what would this do anyway? */
+/* #### this probably needs to be tied into the tty event loop */
+/* #### when there is one */
+#ifdef HAVE_WINDOW_SYSTEM
+{
+struct Lisp_Process *p = (struct Lisp_Process *) header;
+debug_process_finalization (p);
+}
+#endif /* HAVE_WINDOW_SYSTEM */
+}
+/************************************************************************/
+/*                       basic process accessors                        */
+/************************************************************************/
+static SIGTYPE
+close_safely_handler (int signo)
+{
+EMACS_REESTABLISH_SIGNAL (signo, close_safely_handler);
+SIGRETURN;
+}
+static void
+close_safely (int fd)
+{
+stop_interrupts ();
+signal (SIGALRM, close_safely_handler);
+alarm (1);
+close (fd);
+alarm (0);
+start_interrupts ();
+}
+static void
+close_descriptor_pair (int in, int out)
+{
+if (in >= 0)
+close (in);
+if (out != in && out >= 0)
+close (out);
+}
+/* Close all descriptors currently in use for communication
+with subprocess.  This is used in a newly-forked subprocess
+to get rid of irrelevant descriptors.  */
+void
+close_process_descs (void)
+{
+#ifndef WINDOWSNT
+int i;
+for (i = 0; i < MAXDESC; i++)
+{
+Lisp_Object process;
+process = descriptor_to_process[i];
+if (!NILP (process))
+	{
+	  close_descriptor_pair (XPROCESS (process)->infd,
+				 XPROCESS (process)->outfd);
+	}
+}
+#endif
+}
+void
+get_process_file_descriptors (struct Lisp_Process *p, int *infd,
+			      int *outfd)
+{
+if (! p) abort ();
+/* the cast of MAXDESC is needed for some versions of Linux */
+assert (p->infd  >= -1 && p->infd  < ((int) (MAXDESC)));
+assert (p->outfd >= -1 && p->outfd < ((int) (MAXDESC)));
+*infd = p->infd;
+*outfd = p->outfd;
+}
+struct Lisp_Process *
+get_process_from_input_descriptor (int infd)
+{
+Lisp_Object proc;
+if ((infd  < 0) || (infd  >= ((int) (MAXDESC)))) abort ();
+proc = descriptor_to_process[infd];
+if (NILP (proc))
+return 0;
+else
+return XPROCESS (proc);
+}
+int
+get_process_selected_p (struct Lisp_Process *p)
+{
+return p->selected;
+}
+void
+set_process_selected_p (struct Lisp_Process *p, int selected_p)
+{
+p->selected = !!selected_p;
+}
+#ifdef HAVE_SOCKETS
+int
+network_connection_p (Lisp_Object process)
+{
+return (GC_CONSP (XPROCESS (process)->pid));
+}
+#endif
+int
+connected_via_filedesc_p (struct Lisp_Process *p)
+{
+return p->connected_via_filedesc_p;
+}
+DEFUN ("processp", Fprocessp, Sprocessp, 1, 1, 0 /*
+Return t if OBJECT is a process.
+*/ )
+(obj)
+Lisp_Object obj;
+{
+return ((PROCESSP (obj)) ? Qt : Qnil);
+}
+DEFUN ("process-list", Fprocess_list, Sprocess_list, 0, 0, 0 /*
+Return a list of all processes.
+*/ )
+()
+{
+return Fcopy_sequence (Vprocess_list);
+}
+DEFUN ("get-process", Fget_process, Sget_process, 1, 1, 0 /*
+Return the process named NAME, or nil if there is none.
+*/ )
+(name)
+Lisp_Object name;
+{
+Lisp_Object tail;
+if (GC_PROCESSP (name))
+return (name);
+if (!gc_in_progress)
+/* this only gets called during GC when emacs is going away as a result
+of a signal or crash. */
+CHECK_STRING (name);
+for (tail = Vprocess_list; GC_CONSP (tail); tail = XCDR (tail))
+{
+Lisp_Object proc = XCAR (tail);
+QUIT;
+if (!NILP (Fequal (name, XPROCESS (proc)->name)))
+return (XCAR (tail));
+}
+return Qnil;
+}
+DEFUN ("get-buffer-process", Fget_buffer_process, Sget_buffer_process, 1, 1, 0 /*
+Return the (or, a) process associated with BUFFER.
+BUFFER may be a buffer or the name of one.
+*/ )
+(name)
+Lisp_Object name;
+{
+Lisp_Object buf, tail, proc;
+if (GC_NILP (name)) return Qnil;
+buf = Fget_buffer (name);
+if (GC_NILP (buf)) return Qnil;
+#ifdef ENERGIZE
+{
+Lisp_Object p = energize_get_buffer_process (buf);
+if (!GC_NILP (p)) return p;
+}
+#endif
+for (tail = Vprocess_list; GC_CONSP (tail); tail = XCDR (tail))
+{
+/* jwz: do not quit here - it isn't necessary, as there is no way for
+	 Vprocess_list to get circular or overwhelmingly long, and this
+	 function is called from layout_mode_element under redisplay. */
+/* QUIT; */
+proc = XCAR (tail);
+if (GC_PROCESSP (proc) && EQ (XPROCESS (proc)->buffer, buf))
+	return proc;
+}
+return Qnil;
+}
+/* This is how commands for the user decode process arguments.  It
+accepts a process, a process name, a buffer, a buffer name, or nil.
+Buffers denote the first process in the buffer, and nil denotes the
+current buffer.  */
+static Lisp_Object
+get_process (Lisp_Object name)
+{
+Lisp_Object proc;
+#ifdef I18N3
+/* #### Look more closely into translating process names. */
+#endif
+/* This may be called during a GC from process_send_signal() from
+kill_buffer_processes() if emacs decides to abort(). */
+if (GC_PROCESSP (name))
+return name;
+if (GC_NILP (name))
+proc = Fget_buffer_process (Fcurrent_buffer ());
+else
+{
+proc = Fget_process (name);
+if (GC_NILP (proc))
+	proc = Fget_buffer_process (Fget_buffer (name));
+}
+if (!GC_NILP (proc))
+return proc;
+if (GC_NILP (name))
+error ("Current buffer has no process");
+else
+error ("Process %s does not exist", string_data (XSTRING (name)));
+/* NOTREACHED */
+return Qnil; /* warning suppression */
+}
+DEFUN ("process-id", Fprocess_id, Sprocess_id, 1, 1, 0 /*
+Return the process id of PROCESS.
+This is the pid of the Unix process which PROCESS uses or talks to.
+For a network connection, this value is a cons of
+(foreign-network-port . foreign-host-name).
+*/ )
+(proc)
+Lisp_Object proc;
+{
+Lisp_Object pid;
+CHECK_PROCESS (proc);
+pid = XPROCESS (proc)->pid;
+if (network_connection_p (proc))
+/* return (Qnil); */
+return (Fcons (Fcar (pid), Fcdr (pid)));
+else
+return (pid);
+}
+DEFUN ("process-name", Fprocess_name, Sprocess_name, 1, 1, 0 /*
+Return the name of PROCESS, as a string.
+This is the name of the program invoked in PROCESS,
+possibly modified to make it unique among process names.
+*/ )
+(proc)
+Lisp_Object proc;
+{
+CHECK_PROCESS (proc);
+return XPROCESS (proc)->name;
+}
+DEFUN ("process-command", Fprocess_command, Sprocess_command, 1, 1, 0 /*
+Return the command that was executed to start PROCESS.
+This is a list of strings, the first string being the program executed
+and the rest of the strings being the arguments given to it.
+*/ )
+(proc)
+Lisp_Object proc;
+{
+CHECK_PROCESS (proc);
+return XPROCESS (proc)->command;
+}
+/************************************************************************/
+/*                          creating a process                          */
+/************************************************************************/
+static Lisp_Object
+make_process_internal (Lisp_Object name)
+{
+Lisp_Object val, name1;
+int i;
+struct Lisp_Process *p
+= alloc_lcrecord (sizeof (struct Lisp_Process), lrecord_process);
+/* If name is already in use, modify it until it is unused.  */
+name1 = name;
+for (i = 1; ; i++)
+{
+char suffix[10];
+Lisp_Object tem = Fget_process (name1);
+if (NILP (tem))
+break;
+sprintf (suffix, "<%d>", i);
+name1 = concat2 (name, build_string (suffix));
+}
+name = name1;
+p->name = name;
+p->command  = Qnil;
+p->filter   = Qnil;
+p->sentinel = Qnil;
+p->buffer   = Qnil;
+p->mark = Fmake_marker ();
+p->pid = Qnil;
+p->status_symbol = Qrun;
+p->connected_via_filedesc_p = 0;
+p->exit_code = 0;
+p->core_dumped = 0;
+p->infd   = -1;
+p->outfd  = -1;
+p->subtty = -1;
+p->tty_name = Qnil;
+p->pty_flag = 0;
+p->filter_does_read = 0;
+p->kill_without_query = 0;
+p->selected = 0;
+p->tick = 0;
+p->update_tick = 0;
+p->instream  = Qnil;
+p->outstream = Qnil;
+XSETPROCESS (val, p);
+Vprocess_list = Fcons (val, Vprocess_list);
+return (val);
+}
+#ifdef HAVE_PTYS
+/* Open an available pty, returning a file descriptor.
+Return -1 on failure.
+The file name of the terminal corresponding to the pty
+is left in the variable pty_name.  */
+static int
+allocate_pty (void)
+{
+struct stat stb;
+int c, i;
+int fd;
+/* Some systems name their pseudoterminals so that there are gaps in
+the usual sequence - for example, on HP9000/S700 systems, there
+are no pseudoterminals with names ending in 'f'.  So we wait for
+three failures in a row before deciding that we've reached the
+end of the ptys.  */
+int failed_count = 0;
+#ifdef PTY_ITERATION
+PTY_ITERATION
+#else
+for (c = FIRST_PTY_LETTER; c <= 'z'; c++)
+for (i = 0; i < 16; i++)
+#endif
+{
+#ifdef PTY_NAME_SPRINTF
+	PTY_NAME_SPRINTF
+#else
+	sprintf (pty_name, "/dev/pty%c%x", c, i);
+#endif /* no PTY_NAME_SPRINTF */
+#ifdef PTY_OPEN
+	PTY_OPEN;
+#else /* no PTY_OPEN */
+#ifdef IRIS
+	/* Unusual IRIS code */
+	*ptyv = open ("/dev/ptc", O_RDWR | O_NDELAY, 0);
+	if (fd < 0)
+	  return -1;
+	if (fstat (fd, &stb) < 0)
+	  return -1;
+#else /* not IRIS */
+	if (stat (pty_name, &stb) < 0)
+	  {
+	    failed_count++;
+	    if (failed_count >= 3)
+	      return -1;
+	  }
+	else
+	  failed_count = 0;
+#ifdef O_NONBLOCK
+	fd = open (pty_name, O_RDWR | O_NONBLOCK, 0);
+#else
+	fd = open (pty_name, O_RDWR | O_NDELAY, 0);
+#endif
+#endif /* not IRIS */
+#endif /* no PTY_OPEN */
+	if (fd >= 0)
+	  {
+	    /* check to make certain that both sides are available
+	       this avoids a nasty yet stupid bug in rlogins */
+#ifdef PTY_TTY_NAME_SPRINTF
+	    PTY_TTY_NAME_SPRINTF
+#else
+sprintf (pty_name, "/dev/tty%c%x", c, i);
+#endif /* no PTY_TTY_NAME_SPRINTF */
+#ifndef UNIPLUS
+	    if (access (pty_name, 6) != 0)
+	      {
+		close (fd);
+#if !defined(IRIS) && !defined(__sgi)
+		continue;
+#else
+		return -1;
+#endif /* IRIS */
+	      }
+#endif /* not UNIPLUS */
+	    setup_pty (fd);
+	    return fd;
+	  }
+}
+return -1;
+}
+#endif /* HAVE_PTYS */
+static int
+create_bidirectional_pipe (int *inchannel, int *outchannel,
+			   volatile int *forkin, volatile int *forkout)
+{
+int sv[2];
+#ifdef SKTPAIR
+if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv) < 0)
+return -1;
+*outchannel = *inchannel = sv[0];
+*forkout = *forkin = sv[1];
+#else /* not SKTPAIR */
+#ifdef WINDOWSNT
+pipe_with_inherited_out (sv);
+*inchannel = sv[0];
+*forkout = sv[1];
+pipe_with_inherited_in (sv);
+*forkin = sv[0];
+*outchannel = sv[1];
+#else /* not WINDOWSNT */
+int temp;
+temp = pipe (sv);
+if (temp < 0) return -1;
+*inchannel = sv[0];
+*forkout = sv[1];
+temp = pipe (sv);
+if (temp < 0) return -1;
+*outchannel = sv[1];
+*forkin = sv[0];
+#endif /* not WINDOWSNT */
+#endif /* not SKTPAIR */
+return 0;
+}
+#ifndef VMS /* VMS version of this function is in vmsproc.c.  */
+static Bufbyte
+get_eof_char (struct Lisp_Process *p)
+{
+/* Figure out the eof character for the outfd of the given process.
+* The following code is similar to that in process_send_signal, and
+* should probably be merged with that code somehow. */
+#ifdef HAVE_TERMIOS
+struct termios t;
+tcgetattr (p->outfd, &t);
+if (strlen ((CONST char *) t.c_cc) < (unsigned int) (VEOF + 1))
+return (Bufbyte) '\004';
+else
+return (Bufbyte) t.c_cc[VEOF];
+#else /* ! HAVE_TERMIOS */
+/* On Berkeley descendants, the following IOCTL's retrieve the
+current control characters.  */
+#if defined (TIOCGETC)
+struct tchars c;
+ioctl (p->outfd, TIOCGETC, &c);
+return (Bufbyte) c.t_eofc;
+#else /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
+/* On SYSV descendants, the TCGETA ioctl retrieves the current control
+characters.  */
+#ifdef TCGETA
+struct termio t;
+ioctl (p->outfd, TCGETA, &t);
+if (strlen ((CONST char *) t.c_cc) < (unsigned int) (VINTR + 1))
+return (Bufbyte) '\004';
+else
+return (Bufbyte) t.c_cc[VINTR];
+#else /* ! defined (TCGETA) */
+/* Rather than complain, we'll just guess ^D, which is what
+* earlier emacsen always used. */
+return (Bufbyte) '\004';
+#endif /* ! defined (TCGETA) */
+#endif /* ! defined (TIOCGETC) */
+#endif /* ! defined (HAVE_TERMIOS) */
+}
+static int
+get_pty_max_bytes (struct Lisp_Process *p)
+{
+int pty_max_bytes;
+#if defined (HAVE_FPATHCONF) && defined (_PC_MAX_CANON)
+pty_max_bytes = fpathconf (p->outfd, _PC_MAX_CANON);
+if (pty_max_bytes < 0)
+pty_max_bytes = 250;
+#else
+pty_max_bytes = 250;
+#endif
+/* Deduct one, to leave space for the eof.  */
+pty_max_bytes--;
+return pty_max_bytes;
+}
+static void
+init_process_fds (struct Lisp_Process *p, int in, int out)
+{
+p->infd = in;
+p->outfd = out;
+p->instream = make_filedesc_input_stream (in, 0, -1, 0);
+p->outstream = make_filedesc_output_stream (out, 0, -1,
+					      LSTR_BLOCKED_OK
+					      | (p->pty_flag ?
+						 LSTR_PTY_FLUSHING : 0));
+p->filedesc_stream = p->outstream;
+if (p->pty_flag)
+{
+Bufbyte eof_char = get_eof_char (p);
+int pty_max_bytes = get_pty_max_bytes (p);
+filedesc_stream_set_pty_flushing (XLSTREAM (p->outstream),
+					pty_max_bytes, eof_char);
+}
+}
+static void
+create_process (Lisp_Object process,
+char **new_argv, CONST char *current_dir)
+{
+/* This function rewritten by wing@666.com. */
+int pid, inchannel, outchannel;
+/* Use volatile to protect variables from being clobbered by longjmp.  */
+volatile int forkin, forkout;
+volatile int pty_flag = 0;
+char **env;
+struct Lisp_Process *p = XPROCESS (process);
+env = environ;
+inchannel = outchannel = forkin = forkout = -1;
+#ifdef HAVE_PTYS
+if (!NILP (Vprocess_connection_type))
+{
+/* find a new pty, open the master side, return the opened
+	 file handle, and store the name of the corresponding slave
+	 side in global variable pty_name. */
+outchannel = inchannel = allocate_pty ();
+}
+if (inchannel >= 0)
+{
+/* You're "supposed" to now open the slave in the child.
+	 On some systems, we can open it here; this allows for
+	 better error checking. */
+#ifndef USG
+/* On USG systems it does not work to open the pty's tty here
+	       and then close and reopen it in the child.  */
+#ifdef O_NOCTTY
+/* Don't let this terminal become our controlling terminal
+	 (in case we don't have one).  */
+forkout = forkin = open (pty_name, O_RDWR | O_NOCTTY, 0);
+#else
+forkout = forkin = open (pty_name, O_RDWR, 0);
+#endif
+if (forkin < 0)
+	goto io_failure;
+#endif /* not USG */
+p->pty_flag = pty_flag = 1;
+}
+else
+#endif /* HAVE_PTYS */
+if (create_bidirectional_pipe (&inchannel, &outchannel,
+				   &forkin, &forkout) < 0)
+goto io_failure;
+#if 0
+/* Replaced by close_process_descs */
+set_exclusive_use (inchannel);
+set_exclusive_use (outchannel);
+#endif
+set_descriptor_non_blocking (inchannel);
+/* Record this as an active process, with its channels.
+As a result, child_setup will close Emacs's side of the pipes.  */
+descriptor_to_process[inchannel] = process;
+init_process_fds (p, inchannel, outchannel);
+/* Record the tty descriptor used in the subprocess.  */
+p->subtty = forkin;
+p->status_symbol = Qrun;
+p->exit_code = 0;
+{
+/* child_setup must clobber environ on systems with true vfork.
+Protect it from permanent change.  */
+char **save_environ = environ;
+#ifdef EMACS_BTL
+/* when performance monitoring is on, turn it off before the vfork(),
+as the child has no handler for the signal -- when back in the
+parent process, turn it back on if it was really on when you "turned
+it off" */
+int logging_on = cadillac_stop_logging ();	/* #### rename me */
+#endif
+#ifndef WINDOWSNT
+pid = vfork ();
+if (pid == 0)
+#endif /* not WINDOWSNT */
+{
+	/**** Now we're in the child process ****/
+	int xforkin = forkin;
+	int xforkout = forkout;
+	if (!pty_flag)
+	  EMACS_SEPARATE_PROCESS_GROUP ();
+#ifdef HAVE_PTYS
+	else
+	  {
+	    /* Disconnect the current controlling terminal, pursuant to
+	       making the pty be the controlling terminal of the process.
+	       Also put us in our own process group. */
+	    disconnect_controlling_terminal ();
+	    /* Open the pty connection and make the pty's terminal
+	       our controlling terminal.
+	       On systems with TIOCSCTTY, we just use it to set
+	       the controlling terminal.  On other systems, the
+	       first TTY we open becomes the controlling terminal.
+	       So, we end up with four possibilities:
+	       (1) on USG and TIOCSCTTY systems, we open the pty
+	           and use TIOCSCTTY.
+	       (2) on other USG systems, we just open the pty.
+	       (3) on non-USG systems with TIOCSCTTY, we
+	           just use TIOCSCTTY. (On non-USG systems, we
+		   already opened the pty in the parent process.)
+	       (4) on non-USG systems without TIOCSCTTY, we
+	           close the pty and reopen it.
+	       This would be cleaner if we didn't open the pty
+	       in the parent process, but doing it that way
+	       makes it possible to trap error conditions.
+	       It's harder to convey an error from the child
+	       process, and I don't feel like messing with
+	       this now. */
+	    /* There was some weirdo, probably wrong,
+	       conditionalization on RTU and UNIPLUS here.
+	       I deleted it.  So sue me. */
+	    /* SunOS has TIOCSCTTY but the close/open method
+	       also works. */
+#  if defined (USG) || !defined (TIOCSCTTY)
+	    /* Now close the pty (if we had it open) and reopen it.
+	       This makes the pty the controlling terminal of the
+	       subprocess.  */
+	    /* I wonder if close (open (pty_name, ...)) would work?  */
+	    if (xforkin >= 0)
+	      close (xforkin);
+	    xforkout = xforkin = open (pty_name, O_RDWR, 0);
+	    if (xforkin < 0)
+	      {
+		write (1, "Couldn't open the pty terminal ", 31);
+		write (1, pty_name, strlen (pty_name));
+		write (1, "\n", 1);
+		_exit (1);
+	      }
+#  endif /* USG or not TIOCSCTTY */
+	    /* Miscellaneous setup required for some systems.
+Must be done before using tc* functions on xforkin.
+This guarantees that isatty(xforkin) is true. */
+# ifdef SETUP_SLAVE_PTY
+	    SETUP_SLAVE_PTY;
+# endif /* SETUP_SLAVE_PTY */
+#  ifdef TIOCSCTTY
+	    /* We ignore the return value
+	       because faith@cs.unc.edu says that is necessary on Linux.  */
+assert (isatty (xforkin));
+	    ioctl (xforkin, TIOCSCTTY, 0);
+#  endif /* TIOCSCTTY */
+	    /* Change the line discipline. */
+# if defined (HAVE_TERMIOS) && defined (LDISC1)
+	    {
+	      struct termios t;
+assert (isatty (xforkin));
+	      tcgetattr (xforkin, &t);
+	      t.c_lflag = LDISC1;
+	      if (tcsetattr (xforkin, TCSANOW, &t) < 0)
+		perror ("create_process/tcsetattr LDISC1 failed\n");
+	    }
+# elif defined (NTTYDISC) && defined (TIOCSETD)
+	    {
+	      /* Use new line discipline.  TIOCSETD is accepted and
+ignored on Sys5.4 systems with ttcompat. */
+	      int ldisc = NTTYDISC;
+assert (isatty (xforkin));
+	      ioctl (xforkin, TIOCSETD, &ldisc);
+	    }
+# endif /* TIOCSETD & NTTYDISC */
+	    /* Make our process group be the foreground group
+	       of our new controlling terminal. */
+	    {
+	      int piddly = EMACS_GET_PROCESS_GROUP ();
+	      EMACS_SET_TTY_PROCESS_GROUP (xforkin, &piddly);
+	    }
+# ifdef AIX
+	    /* On AIX, we've disabled SIGHUP above once we start a
+	       child on a pty.  Now reenable it in the child, so it
+	       will die when we want it to.  */
+	    signal (SIGHUP, SIG_DFL);
+# endif /* AIX */
+	  }
+#endif /* HAVE_PTYS */
+	signal (SIGINT, SIG_DFL);
+	signal (SIGQUIT, SIG_DFL);
+#ifndef MSDOS
+	if (pty_flag)
+	  {
+	    /* Set up the terminal characteristics of the pty. */
+	    child_setup_tty (xforkout);
+	  }
+#ifdef WINDOWSNT
+	pid = child_setup (xforkin, xforkout, xforkout,
+			   new_argv, current_dir);
+#else  /* not WINDOWSNT */
+	child_setup (xforkin, xforkout, xforkout, new_argv, current_dir);
+#endif /* not WINDOWSNT */
+#endif /* not MSDOS */
+}
+#ifdef EMACS_BTL
+else if (logging_on)
+cadillac_start_logging ();	/* #### rename me */
+#endif
+environ = save_environ;
+}
+if (pid < 0)
+{
+close_descriptor_pair (forkin, forkout);
+report_file_error ("Doing vfork", Qnil);
+}
+p->pid = make_int (pid);
+/* p->subtty = -1; */
+#ifdef WINDOWSNT
+register_child (pid, inchannel);
+#endif /* WINDOWSNT */
+/* If the subfork execv fails, and it exits,
+this close hangs.  I don't know why.
+So have an interrupt jar it loose.  */
+if (forkin >= 0)
+close_safely (forkin);
+if (forkin != forkout && forkout >= 0)
+close (forkout);
+#ifdef HAVE_PTYS
+if (pty_flag)
+XPROCESS (process)->tty_name = build_string (pty_name);
+else
+#endif
+XPROCESS (process)->tty_name = Qnil;
+/* Notice that SIGCHLD was not blocked. (This is not possible on
+some systems.) No biggie if SIGCHLD occurs right around the
+time that this call happens, because SIGCHLD() does not actually
+deselect the process (that doesn't occur until the next time
+we're waiting for an event, when status_notify() is called). */
+event_stream_select_process (XPROCESS (process));
+return;
+io_failure:
+{
+int temp = errno;
+close_descriptor_pair (forkin, forkout);
+close_descriptor_pair (inchannel, outchannel);
+errno = temp;
+report_file_error ("Opening pty or pipe", Qnil);
+}
+}
+#endif /* not VMS */
+/* This function is the unwind_protect form for Fstart_process_internal.  If
+PROC doesn't have its pid set, then we know someone has signalled
+an error and the process wasn't started successfully, so we should
+remove it from the process list.  */
+static void remove_process (Lisp_Object proc);
+static Lisp_Object
+start_process_unwind (Lisp_Object proc)
+{
+/* Was PROC started successfully?  */
+if (EQ (XPROCESS (proc)->pid, Qnil))
+remove_process (proc);
+return Qnil;
+}
+DEFUN ("start-process-internal", Fstart_process_internal,
+Sstart_process_internal, 3, MANY, 0 /*
+Start a program in a subprocess.  Return the process object for it.
+Args are NAME BUFFER PROGRAM &rest PROGRAM-ARGS
+NAME is name for process.  It is modified if necessary to make it unique.
+BUFFER is the buffer or (buffer-name) to associate with the process.
+Process output goes at end of that buffer, unless you specify
+an output stream or filter function to handle the output.
+BUFFER may be also nil, meaning that this process is not associated
+with any buffer
+Third arg is program file name.  It is searched for as in the shell.
+Remaining arguments are strings to give program as arguments.
+INCODE and OUTCODE specify the coding-system objects used in input/output
+from/to the process.
+*/ )
+(nargs, args)
+int nargs;
+Lisp_Object *args;
+{
+/* !!#### This function has not been Mule-ized */
+/* This function can GC */
+Lisp_Object buffer, name, program, proc, current_dir;
+Lisp_Object tem;
+int speccount = specpdl_depth ();
+#ifdef VMS
+char *new_argv;
+int len;
+#else
+char **new_argv;
+#endif
+int i;
+buffer = args[1];
+if (!NILP (buffer))
+buffer = Fget_buffer_create (buffer);
+CHECK_STRING (args[0]);    /* name */
+CHECK_STRING (args[2]);    /* program */
+/* Make sure that the child will be able to chdir to the current
+buffer's current directory, or its unhandled equivalent.  We
+can't just have the child check for an error when it does the
+chdir, since it's in a vfork.
+We have to GCPRO around this because Fexpand_file_name and
+Funhandled_file_name_directory might call a file name handling
+function.  The argument list is protected by the caller, so all
+we really have to worry about is buffer.  */
+{
+struct gcpro gcpro1, gcpro2; /* Caller gc-protects args[] */
+current_dir = current_buffer->directory;
+GCPRO2 (buffer, current_dir);
+current_dir =
+expand_and_dir_to_file (Funhandled_file_name_directory (current_dir),
+			      Qnil);
+#if 0	/* This loser breaks ange-ftp */
+if (NILP (Ffile_accessible_directory_p (current_dir)))
+report_file_error ("Setting current directory",
+			 list1 (current_buffer->directory));
+#endif /* 0 */
+UNGCPRO;
+}
+name = args[0];
+program = args[2];
+#ifdef VMS
+/* Make a one member argv with all args concatenated
+together separated by a blank.  */
+len = string_length (XSTRING (program)) + 2;
+for (i = 3; i < nargs; i++)
+{
+tem = args[i];
+CHECK_STRING (tem);
+len += string_length (XSTRING (tem)) + 1;	/* count the blank */
+}
+new_argv = (char *) alloca (len);
+strcpy (new_argv, string_data (XSTRING (program)));
+for (i = 3; i < nargs; i++)
+{
+tem = args[i];
+CHECK_STRING (tem);
+strcat (new_argv, " ");
+strcat (new_argv, string_data (XSTRING (tem)));
+}
+/* Need to add code here to check for program existence on VMS */
+#else /* not VMS */
+new_argv = (char **)
+alloca ((nargs - 1) * sizeof (char *));
+new_argv[0] = (char *) string_data (XSTRING (program));
+/* If program file name is not absolute, search our path for it */
+if (!IS_DIRECTORY_SEP (string_byte (XSTRING (program), 0))
+&& !(string_length (XSTRING (program)) > 1
+	   && IS_DEVICE_SEP (string_byte (XSTRING (program), 1))))
+{
+struct gcpro gcpro1, gcpro2, gcpro3, gcpro4; /* Caller protects args[] */
+GCPRO4 (buffer, current_dir, name, program);
+tem = Qnil;
+locate_file (Vexec_path, program, EXEC_SUFFIXES, &tem,
+		   X_OK);
+UNGCPRO;
+if (NILP (tem))
+	report_file_error ("Searching for program", list1 (program));
+tem = Fexpand_file_name (tem, Qnil);
+new_argv[0] = (char *) string_data (XSTRING (tem));
+}
+else
+{
+if (!NILP (Ffile_directory_p (program)))
+	error ("Specified program for new process is a directory");
+}
+for (i = 3; i < nargs; i++)
+{
+tem = args[i];
+CHECK_STRING (tem);
+new_argv[i - 2] =
+	(char *) string_data (XSTRING (tem));
+}
+new_argv[i - 2] = 0;
+#endif /* not VMS */
+proc = make_process_internal (name);
+XPROCESS (proc)->buffer = buffer;
+XPROCESS (proc)->command = Flist (nargs - 2,
+				    args + 2);
+/* Make the process marker point into the process buffer (if any).  */
+if (!NILP (buffer))
+Fset_marker (XPROCESS (proc)->mark,
+		 make_int (BUF_ZV (XBUFFER (buffer))), buffer);
+/* If an error occurs and we can't start the process, we want to
+remove it from the process list.  This means that each error
+check in create_process doesn't need to call remove_process
+itself; it's all taken care of here.  */
+record_unwind_protect (start_process_unwind, proc);
+create_process (proc, new_argv,
+		  (char *) string_data (XSTRING (current_dir)));
+return unbind_to (speccount, proc);
+}
+/* connect to an existing file descriptor.  This is very similar to
+open-network-stream except that it assumes that the connection has
+already been initialized.  It is currently used for ToolTalk
+communication. */
+/* This function used to be visible on the Lisp level, but there is no
+real point in doing that.  Here is the doc string:
+"Connect to an existing file descriptor.\n\
+Returns a subprocess-object to represent the connection.\n\
+Input and output work as for subprocesses; `delete-process' closes it.\n\
+Args are NAME BUFFER INFD OUTFD.\n\
+NAME is name for process.  It is modified if necessary to make it unique.\n\
+BUFFER is the buffer (or buffer-name) to associate with the process.\n\
+Process output goes at end of that buffer, unless you specify\n\
+an output stream or filter function to handle the output.\n\
+BUFFER may be also nil, meaning that this process is not associated\n\
+with any buffer\n\
+INFD and OUTFD specify the file descriptors to use for input and\n\
+output, respectively."
+*/
+Lisp_Object
+connect_to_file_descriptor (Lisp_Object name, Lisp_Object buffer,
+			    Lisp_Object infd, Lisp_Object outfd)
+{
+/* This function can GC */
+Lisp_Object proc;
+int inch;
+CHECK_STRING (name);
+CHECK_INT (infd);
+CHECK_INT (outfd);
+inch = XINT (infd);
+if (!NILP (descriptor_to_process[inch]))
+error ("There is already a process connected to fd %d", inch);
+if (!NILP (buffer))
+buffer = Fget_buffer_create (buffer);
+proc = make_process_internal (name);
+descriptor_to_process[inch] = proc;
+XPROCESS (proc)->pid = Fcons (infd, name);
+XPROCESS (proc)->buffer = buffer;
+init_process_fds (XPROCESS (proc), inch, XINT (outfd));
+XPROCESS (proc)->connected_via_filedesc_p = 1;
+event_stream_select_process (XPROCESS (proc));
+return proc;
+}
+#ifdef HAVE_SOCKETS
+static int
+get_internet_address (Lisp_Object host, struct sockaddr_in *address,
+		      Error_behavior errb)
+{
+struct hostent *host_info_ptr;
+#ifndef HAVE_TERM
+memset (address, 0, sizeof (*address));
+while (1)
+{
+#ifdef TRY_AGAIN
+h_errno = 0;
+#endif
+/* Some systems can't handle SIGIO/SIGALARM in gethostbyname. */
+slow_down_interrupts ();
+host_info_ptr = gethostbyname ((char *) string_data (XSTRING (host)));
+speed_up_interrupts ();
+#ifdef TRY_AGAIN
+if (! (host_info_ptr == 0 && h_errno == TRY_AGAIN))
+#endif
+	break;
+Fsleep_for (make_int (1));
+}
+if (host_info_ptr)
+{
+address->sin_family = host_info_ptr->h_addrtype;
+memcpy (&address->sin_addr, host_info_ptr->h_addr, host_info_ptr->h_length);
+}
+else
+{
+IN_ADDR numeric_addr;
+/* Attempt to interpret host as numeric inet address */
+numeric_addr = inet_addr ((char *) string_data (XSTRING (host)));
+if (NUMERIC_ADDR_ERROR)
+	{
+	  maybe_error (Qprocess, errb,
+		       "Unknown host \"%s\"", string_data (XSTRING (host)));
+	  return 0;
+	}
+/* There was some broken code here that called strlen() here
+	 on (char *) &numeric_addr and even sometimes accessed
+	 uninitialized data. */
+address->sin_family = AF_INET;
+* (IN_ADDR *) &address->sin_addr = numeric_addr;
+}
+return 1;
+}
+/* open a TCP network connection to a given HOST/SERVICE.  Treated
+exactly like a normal process when reading and writing.  Only
+differences are in status display and process deletion.  A network
+connection has no PID; you cannot signal it.  All you can do is
+deactivate and close it via delete-process */
+DEFUN ("open-network-stream-internal", Fopen_network_stream_internal,
+Sopen_network_stream_internal,
+4, 4, 0 /*
+Open a TCP connection for a service to a host.
+Returns a subprocess-object to represent the connection.
+Input and output work as for subprocesses; `delete-process' closes it.
+Args are NAME BUFFER HOST SERVICE.
+NAME is name for process.  It is modified if necessary to make it unique.
+BUFFER is the buffer (or buffer-name) to associate with the process.
+Process output goes at end of that buffer, unless you specify
+an output stream or filter function to handle the output.
+BUFFER may be also nil, meaning that this process is not associated
+with any buffer
+Third arg is name of the host to connect to, or its IP address.
+Fourth arg SERVICE is name of the service desired, or an integer
+specifying a port number to connect to.
+*/ )
+(name, buffer, host, service)
+Lisp_Object name, buffer, host, service;
+{
+/* !!#### This function has not been Mule-ized */
+/* This function can GC */
+Lisp_Object proc;
+struct sockaddr_in address;
+int s, outch, inch;
+int port;
+struct gcpro gcpro1, gcpro2, gcpro3, gcpro4;
+int retry = 0;
+int retval;
+GCPRO4 (name, buffer, host, service);
+CHECK_STRING (name);
+CHECK_STRING (host);
+if (INTP (service))
+port = htons ((unsigned short) XINT (service));
+else
+{
+struct servent *svc_info;
+CHECK_STRING (service);
+svc_info = getservbyname ((char *) string_data (XSTRING (service)),
+				"tcp");
+if (svc_info == 0)
+#ifdef WIN32
+	error ("Unknown service \"%s\" (%d)",
+	       string_data (XSTRING (service)), WSAGetLastError ());
+#else
+	error ("Unknown service \"%s\"", string_data (XSTRING (service)));
+#endif
+port = svc_info->s_port;
+}
+get_internet_address (host, &address, ERROR_ME);
+address.sin_port = port;
+s = socket (address.sin_family, SOCK_STREAM, 0);
+if (s < 0)
+report_file_error ("error creating socket", list1 (name));
+/* Turn off interrupts here -- see comments below.  There used to
+be code which called bind_polling_period() to slow the polling
+period down rather than turn it off, but that seems rather
+bogus to me.  Best thing here is to use a non-blocking connect
+or something, to check for QUIT. */
+/* Comments that are not quite valid: */
+/* Kernel bugs (on Ultrix at least) cause lossage (not just EINTR)
+when connect is interrupted.  So let's not let it get interrupted.
+Note we do not turn off polling, because polling is only used
+when not interrupt_input, and thus not normally used on the systems
+which have this bug.  On systems which use polling, there's no way
+to quit if polling is turned off.  */
+/* Slow down polling.  Some kernels have a bug which causes retrying
+connect to fail after a connect.  */
+slow_down_interrupts ();
+loop:
+/* A system call interrupted with a SIGALRM or SIGIO comes back
+here, with can_break_system_calls reset to 0. */
+SETJMP (break_system_call_jump);
+if (QUITP)
+{
+speed_up_interrupts ();
+REALLY_QUIT;
+/* In case something really weird happens ... */
+slow_down_interrupts ();
+}
+/* Break out of connect with a signal (it isn't otherwise possible).
+Thus you don't get screwed with a hung network. */
+can_break_system_calls = 1;
+retval = connect (s, (struct sockaddr *) &address, sizeof (address));
+can_break_system_calls = 0;
+if (retval == -1 && errno != EISCONN)
+{
+int xerrno = errno;
+if (errno == EINTR)
+	goto loop;
+if (errno == EADDRINUSE && retry < 20)
+	{
+	  /* A delay here is needed on some FreeBSD systems,
+	     and it is harmless, since this retrying takes time anyway
+	     and should be infrequent.  */
+	  Fsleep_for (make_int (1));
+	  retry++;
+	  goto loop;
+	}
+close (s);
+speed_up_interrupts ();
+errno = xerrno;
+report_file_error ("connection failed", list2 (host, name));
+}
+speed_up_interrupts ();
+#else /* HAVE_TERM */
+s = connect_server (0);
+if (s < 0)
+report_file_error ("error creating socket", Fcons (name, Qnil));
+send_command (s, C_PORT, 0, "%s:%d", string_data (XSTRING (host)), ntohs (port));
+send_command (s, C_DUMB, 1, 0);
+#endif /* HAVE_TERM */
+inch = s;
+outch = dup (s);
+if (outch < 0)
+{
+close (s); /* this used to be leaked; from Kyle Jones */
+report_file_error ("error duplicating socket", list1 (name));
+}
+if (!NILP (buffer))
+buffer = Fget_buffer_create (buffer);
+proc = make_process_internal (name);
+descriptor_to_process[inch] = proc;
+set_descriptor_non_blocking (inch);
+XPROCESS (proc)->pid = Fcons (service, host);
+XPROCESS (proc)->buffer = buffer;
+init_process_fds (XPROCESS (proc), inch, outch);
+XPROCESS (proc)->connected_via_filedesc_p = 0;
+event_stream_select_process (XPROCESS (proc));
+UNGCPRO;
+return proc;
+}
+#endif	/* HAVE_SOCKETS */
+Lisp_Object
+canonicalize_host_name (Lisp_Object host)
+{
+#ifdef HAVE_SOCKETS
+/* #### for HAVE_TERM, you probably have to do something else. */
+struct sockaddr_in address;
+if (!get_internet_address (host, &address, ERROR_ME_NOT))
+return host;
+if (address.sin_family == AF_INET)
+return build_string (inet_ntoa (address.sin_addr));
+else
+/* #### any clue what to do here? */
+return host;
+#else
+return host;
+#endif
+}
+DEFUN ("set-process-window-size", Fset_process_window_size,
+Sset_process_window_size, 3, 3, 0 /*
+Tell PROCESS that it has logical window size HEIGHT and WIDTH.
+*/ )
+(proc, height, width)
+Lisp_Object proc, height, width;
+{
+CHECK_PROCESS (proc);
+CHECK_NATNUM (height);
+CHECK_NATNUM (width);
+if (set_window_size (XPROCESS (proc)->infd, XINT (height), XINT (width))
+<= 0)
+return Qnil;
+else
+return Qt;
+}
+/************************************************************************/
+/*                              Process I/O                             */
+/************************************************************************/
+/*  (Faccept_process_output is now in event-stream.c) */
+/* Some FSFmacs error handlers here.  We handle this
+in call2_trapping_errors(). */
+/* Read pending output from the process channel,
+starting with our buffered-ahead character if we have one.
+Yield number of characters read.
+This function reads at most 1024 bytes.
+If you want to read all available subprocess output,
+you must call it repeatedly until it returns zero.  */
+Charcount
+read_process_output (Lisp_Object proc)
+{
+/* This function can GC */
+Bytecount nbytes, nchars;
+#ifdef VMS
+char *chars;
+#else
+Bufbyte chars[1024];
+#endif
+Lisp_Object outstream;
+struct Lisp_Process *p = XPROCESS (proc);
+/* If there is a lot of output from the subprocess, the loop in
+execute_internal_event() might call read_process_output() more
+than once.  If the filter that was executed from one of these
+calls set the filter to t, we have to stop now.  Return -1 rather
+than 0 so execute_internal_event() doesn't close the process.
+Really, the loop in execute_internal_event() should check itself
+for a process-filter change, like in status_notify(); but the
+struct Lisp_Process is not exported outside of this file. */
+if (p->infd < 0)
+return -1; /* already closed */
+if (!NILP (p->filter) && (p->filter_does_read))
+{
+Lisp_Object filter_result;
+/* Some weird FSFmacs crap here with
+	 Vdeactivate_mark and current_buffer->keymap */
+running_asynch_code = 1;
+filter_result = call2_trapping_errors ("Error in process filter",
+					     p->filter, proc, Qnil);
+running_asynch_code = 0;
+restore_match_data ();
+CHECK_INT (filter_result);
+return XINT (filter_result);
+}
+#ifdef VMS
+VMS_PROC_STUFF *vs, *get_vms_process_pointer();
+vs = get_vms_process_pointer (XINT (p->pid));
+if (vs)
+{
+if (!vs->iosb[0])
+	return(0);		/* Really weird if it does this */
+if (!(vs->iosb[0] & 1))
+	return -1;		/* I/O error */
+}
+else
+error ("Could not get VMS process pointer");
+chars = vs->inputBuffer;
+nbytes = clean_vms_buffer (chars, vs->iosb[1]);
+if (nbytes <= 0)
+{
+start_vms_process_read (vs); /* Crank up the next read on the process */
+return 1;			/* Nothing worth printing, say we got 1 */
+}
+#else /* not VMS */
+#if 0 /* FSFmacs */
+/* #### equivalent code from FSFmacs.  Would need some porting
+for Windows NT. */
+if (proc_buffered_char[channel] < 0)
+#ifdef WINDOWSNT
+nchars = read_child_output (channel, chars, sizeof (chars));
+#else
+nchars = read (channel, chars, sizeof chars);
+#endif
+else
+{
+chars[0] = proc_buffered_char[channel];
+proc_buffered_char[channel] = -1;
+#ifdef WINDOWSNT
+nchars = read_child_output (channel, chars + 1, sizeof (chars) - 1);
+#else
+nchars = read (channel, chars + 1, sizeof chars - 1);
+#endif
+if (nchars < 0)
+	nchars = 1;
+else
+	nchars = nchars + 1;
+}
+#endif /* FSFmacs */
+nbytes = Lstream_read (XLSTREAM (p->instream), chars, sizeof (chars));
+if (nbytes <= 0) return nbytes;
+#endif /* not VMS */
+nchars = bytecount_to_charcount (chars, nbytes);
+outstream = p->filter;
+if (!NILP (outstream))
+{
+/* We used to bind inhibit-quit to t here, but
+	 call2_trapping_errors() does that for us. */
+running_asynch_code = 1;
+call2_trapping_errors ("Error in process filter",
+			     outstream, proc, make_string (chars, nbytes));
+running_asynch_code = 0;
+restore_match_data ();
+#ifdef VMS
+start_vms_process_read (vs);
+#endif
+return (nchars);
+}
+/* If no filter, write into buffer if it isn't dead.  */
+if (!NILP (p->buffer) && BUFFER_LIVE_P (XBUFFER (p->buffer)))
+{
+Lisp_Object old_read_only = Qnil;
+Bufpos old_point;
+Bufpos old_begv;
+Bufpos old_zv;
+int old_zmacs_region_stays = zmacs_region_stays;
+struct gcpro gcpro1, gcpro2;
+struct buffer *buf = XBUFFER (p->buffer);
+GCPRO2 (proc, old_read_only);
+old_point = BUF_PT (buf);
+old_begv = BUF_BEGV (buf);
+old_zv = BUF_ZV (buf);
+old_read_only = buf->read_only;
+buf->read_only = Qnil;
+/* Insert new output into buffer
+	 at the current end-of-output marker,
+	 thus preserving logical ordering of input and output.  */
+if (XMARKER (p->mark)->buffer)
+	BUF_SET_PT (buf,
+		    bufpos_clip_to_bounds (old_begv, marker_position (p->mark),
+					   old_zv));
+else
+	BUF_SET_PT (buf, old_zv);
+/* If the output marker is outside of the visible region, save
+	 the restriction and widen.  */
+if (! (BUF_BEGV (buf) <= BUF_PT (buf) &&
+	     BUF_PT (buf) <= BUF_ZV (buf)))
+	Fwiden (p->buffer);
+/* Make sure opoint floats ahead of any new text, just as point
+	 would.  */
+if (BUF_PT (buf) <= old_point)
+	old_point += nchars;
+/* Insert after old_begv, but before old_zv.  */
+if (BUF_PT (buf) < old_begv)
+	old_begv += nchars;
+if (BUF_PT (buf) <= old_zv)
+	old_zv += nchars;
+#if 0
+/* This screws up intial display of the window.  jla */
+/* Insert before markers in case we are inserting where
+	 the buffer's mark is, and the user's next command is Meta-y.  */
+buffer_insert_raw_string_1 (buf, -1, chars,
+				  nbytes, INSDEL_BEFORE_MARKERS);
+#else
+buffer_insert_raw_string (buf, chars, nbytes);
+#endif
+Fset_marker (p->mark, make_int (BUF_PT (buf)), p->buffer);
+MARK_MODELINE_CHANGED;
+/* If the restriction isn't what it should be, set it.  */
+if (old_begv != BUF_BEGV (buf) || old_zv != BUF_ZV (buf))
+	Fnarrow_to_region (make_int (old_begv), make_int (old_zv),
+			   p->buffer);
+/* Handling the process output should not deactivate the mark.  */
+zmacs_region_stays = old_zmacs_region_stays;
+buf->read_only = old_read_only;
+BUF_SET_PT (buf, old_point);
+UNGCPRO;
+}
+#ifdef VMS
+start_vms_process_read (vs);
+#endif
+return (nchars);
+}
+/* Sending data to subprocess */
+static JMP_BUF send_process_frame;
+static SIGTYPE
+send_process_trap (int signum)
+{
+EMACS_REESTABLISH_SIGNAL (signum, send_process_trap);
+EMACS_UNBLOCK_SIGNAL (signum);
+LONGJMP (send_process_frame, 1);
+}
+/* send some data to process PROC.  If NONRELOCATABLE is non-NULL, it
+specifies the address of the data.  Otherwise, the data comes from the
+object RELOCATABLE (either a string or a buffer).  START and LEN
+specify the offset and length of the data to send.
+Note that START and LEN are in Bufpos's if RELOCATABLE is a buffer,
+and in Bytecounts otherwise. */
+static void
+send_process (volatile Lisp_Object proc,
+Lisp_Object relocatable, CONST Bufbyte *nonrelocatable,
+int start, int len)
+{
+/* This function can GC */
+/* Use volatile to protect variables from being clobbered by longjmp.  */
+struct gcpro gcpro1, gcpro2;
+SIGTYPE (*old_sigpipe) (int) = 0;
+Lisp_Object lstream = Qnil;
+volatile struct Lisp_Process *p = XPROCESS (proc);
+#if defined (NO_UNION_TYPE) /* || !defined (__GNUC__) GCC bug only??? */
+/* #### ugh! There must be a better solution. */
+Lisp_Object defeat_volatile_kludge = (Lisp_Object) proc;
+#else
+Lisp_Object defeat_volatile_kludge = proc;
+#endif
+#ifdef VMS
+VMS_PROC_STUFF *vs, *get_vms_process_pointer (int);
+#endif /* VMS */
+GCPRO2 (defeat_volatile_kludge, lstream);
+if (p->outfd < 0)
+signal_simple_error ("Process not open for writing", proc);
+#ifdef VMS
+vs = get_vms_process_pointer (XINT (p->pid));
+if (vs == 0)
+error ("Could not find this process: %x",
+	   XINT (p->pid));
+else if (write_to_vms_process (vs, buf, len))
+;
+#else
+if (nonrelocatable)
+lstream =
+make_fixed_buffer_input_stream (nonrelocatable + start, len);
+else if (GC_BUFFERP (relocatable))
+lstream = make_lisp_buffer_input_stream (XBUFFER (relocatable),
+					     start, start + len, 0);
+else
+lstream = make_lisp_string_input_stream (relocatable, start, len);
+if (!SETJMP (send_process_frame))
+{
+/* use a reasonable-sized buffer (somewhere around the size of the
+	 stream buffer) so as to avoid inundating the stream with blocked
+	 data. */
+Bufbyte chunkbuf[512];
+Bytecount chunklen;
+while (1)
+	{
+	  int writeret;
+	  chunklen = Lstream_read (XLSTREAM (lstream), chunkbuf, 512);
+	  if (chunklen <= 0)
+	    break; /* perhaps should abort() if < 0?
+		      This should never happen. */
+	  old_sigpipe =
+	    (SIGTYPE (*) (int)) signal (SIGPIPE, send_process_trap);
+	  /* Lstream_write() will never successfully write less than
+	     the amount sent in.  In the worst case, it just buffers
+	     the unwritten data. */
+	  writeret = Lstream_write (XLSTREAM (p->outstream), chunkbuf,
+				    chunklen);
+	  signal (SIGPIPE, old_sigpipe);
+	  if (writeret < 0)
+	    /* This is a real error.  Blocking errors are handled
+	       specially inside of the filedesc stream. */
+	    report_file_error ("writing to process",
+			       list1 (proc));
+	  while (filedesc_stream_was_blocked (XLSTREAM (p->filedesc_stream)))
+	    {
+	      /* Buffer is full.  Wait, accepting input;
+		 that may allow the program
+		 to finish doing output and read more.  */
+	      Faccept_process_output (Qnil, make_int (1), Qnil);
+	      old_sigpipe =
+		(SIGTYPE (*) (int)) signal (SIGPIPE, send_process_trap);
+	      Lstream_flush (XLSTREAM (p->filedesc_stream));
+	      signal (SIGPIPE, old_sigpipe);
+	    }
+	}
+}
+#endif /* !VMS */
+else
+{ /* We got here from a longjmp() from the SIGPIPE handler */
+signal (SIGPIPE, old_sigpipe);
+p->status_symbol = Qexit;
+p->exit_code = 256; /* #### SIGPIPE ??? */
+p->core_dumped = 0;
+p->tick++;
+process_tick++;
+deactivate_process (proc);
+#ifdef VMS
+error ("Error writing to process %s; closed it",
+	     string_data (XSTRING (p->name)));
+#else
+error ("SIGPIPE raised on process %s; closed it",
+	     string_data (XSTRING (p->name)));
+#endif
+}
+Lstream_flush (XLSTREAM (p->outstream));
+UNGCPRO;
+}
+DEFUN ("process-tty-name", Fprocess_tty_name, Sprocess_tty_name, 1, 1, 0 /*
+Return the name of the terminal PROCESS uses, or nil if none.
+This is the terminal that the process itself reads and writes on,
+not the name of the pty that Emacs uses to talk with that terminal.
+*/ )
+(proc)
+Lisp_Object proc;
+{
+CHECK_PROCESS (proc);
+return XPROCESS (proc)->tty_name;
+}
+DEFUN ("set-process-buffer", Fset_process_buffer, Sset_process_buffer,
+2, 2, 0 /*
+Set buffer associated with PROCESS to BUFFER (a buffer, or nil).
+*/ )
+(proc, buffer)
+Lisp_Object proc, buffer;
+{
+CHECK_PROCESS (proc);
+if (!NILP (buffer))
+CHECK_BUFFER (buffer);
+XPROCESS (proc)->buffer = buffer;
+return buffer;
+}
+DEFUN ("process-buffer", Fprocess_buffer, Sprocess_buffer,
+1, 1, 0 /*
+Return the buffer PROCESS is associated with.
+Output from PROCESS is inserted in this buffer
+unless PROCESS has a filter.
+*/ )
+(proc)
+Lisp_Object proc;
+{
+CHECK_PROCESS (proc);
+return XPROCESS (proc)->buffer;
+}
+DEFUN ("process-mark", Fprocess_mark, Sprocess_mark,
+1, 1, 0 /*
+Return the marker for the end of the last output from PROCESS.
+*/ )
+(proc)
+Lisp_Object proc;
+{
+CHECK_PROCESS (proc);
+#ifdef ENERGIZE
+if (EQ (proc, Venergize_process)) /* per buffer rather than per process */
+return Fenergize_user_input_buffer_mark (Qnil); /* ## current_buffer ok? */
+#endif
+return XPROCESS (proc)->mark;
+}
+void
+set_process_filter (Lisp_Object proc, Lisp_Object filter, int filter_does_read)
+{
+CHECK_PROCESS (proc);
+if (PROCESS_LIVE_P (proc))
+if (EQ (filter, Qt))
+event_stream_unselect_process (XPROCESS (proc));
+else
+event_stream_select_process (XPROCESS (proc));
+XPROCESS (proc)->filter = filter;
+XPROCESS (proc)->filter_does_read = filter_does_read;
+}
+DEFUN ("set-process-filter", Fset_process_filter, Sset_process_filter,
+2, 2, 0 /*
+Give PROCESS the filter function FILTER; nil means no filter.
+t means stop accepting output from the process.
+When a process has a filter, each time it does output
+the entire string of output is passed to the filter.
+The filter gets two arguments: the process and the string of output.
+If the process has a filter, its buffer is not used for output.
+*/ )
+(proc, filter)
+Lisp_Object proc, filter;
+{
+set_process_filter (proc, filter, 0);
+return filter;
+}
+DEFUN ("process-filter", Fprocess_filter, Sprocess_filter,
+1, 1, 0 /*
+Return the filter function of PROCESS; nil if none.
+See `set-process-filter' for more info on filter functions.
+*/ )
+(proc)
+Lisp_Object proc;
+{
+CHECK_PROCESS (proc);
+return XPROCESS (proc)->filter;
+}
+DEFUN ("process-send-region", Fprocess_send_region, Sprocess_send_region,
+3, 3, 0 /*
+Send current contents of region as input to PROCESS.
+PROCESS may be a process name or an actual process.
+Called from program, takes three arguments, PROCESS, START and END.
+If the region is more than 500 or so characters long,
+it is sent in several bunches.  This may happen even for shorter regions.
+Output from processes can arrive in between bunches.
+*/ )
+(process, start, end)
+Lisp_Object process, start, end;
+{
+/* This function can GC */
+Lisp_Object proc = get_process (process);
+Bufpos st, en;
+get_buffer_range_char (current_buffer, start, end, &st, &en, 0);
+send_process (proc, Fcurrent_buffer (), 0,
+st, en - st);
+return (Qnil);
+}
+DEFUN ("process-send-string", Fprocess_send_string, Sprocess_send_string,
+2, 4, 0 /*
+Send PROCESS the contents of STRING as input.
+PROCESS may be a process name or an actual process.
+Optional arguments FROM and TO specify part of STRING, see `substring'.
+If STRING is more than 500 or so characters long,
+it is sent in several bunches.  This may happen even for shorter strings.
+Output from processes can arrive in between bunches.
+*/ )
+(process, string, from, to)
+Lisp_Object process, string, from, to;
+{
+/* This function can GC */
+Lisp_Object proc;
+Bytecount len;
+Bytecount bfr, bto;
+proc = get_process (process);
+CHECK_STRING (string);
+get_string_range_byte (string, from, to, &bfr, &bto,
+			 GB_HISTORICAL_STRING_BEHAVIOR);
+len = bto - bfr;
+send_process (proc, string, 0, bfr, len);
+return (Qnil);
+}
+/************************************************************************/
+/*                             process status                           */
+/************************************************************************/
+/* Some FSFmacs error handlers here.  We handle this
+in call2_trapping_errors(). */
+static Lisp_Object
+exec_sentinel_unwind (Lisp_Object datum)
+{
+struct Lisp_Cons *d = XCONS (datum);
+XPROCESS (d->car)->sentinel = d->cdr;
+free_cons (d);
+return Qnil;
+}
+static void
+exec_sentinel (Lisp_Object proc, Lisp_Object reason)
+{
+/* This function can GC */
+Lisp_Object sentinel;
+struct Lisp_Process *p = XPROCESS (proc);
+int speccount = specpdl_depth ();
+sentinel = p->sentinel;
+if (NILP (sentinel))
+return;
+/* Some weird FSFmacs crap here with
+Vdeactivate_mark and current_buffer->keymap */
+/* Zilch the sentinel while it's running, to avoid recursive invocations;
+assure that it gets restored no matter how the sentinel exits.  */
+p->sentinel = Qnil;
+record_unwind_protect (exec_sentinel_unwind, noseeum_cons (proc, sentinel));
+/* We used to bind inhibit-quit to t here, but call2_trapping_errors()
+does that for us. */
+running_asynch_code = 1;
+call2_trapping_errors ("Error in process sentinel",
+			 sentinel, proc, reason);
+running_asynch_code = 0;
+restore_match_data ();
+unbind_to (speccount, Qnil);
+}
+DEFUN ("set-process-sentinel", Fset_process_sentinel, Sset_process_sentinel,
+2, 2, 0 /*
+Give PROCESS the sentinel SENTINEL; nil for none.
+The sentinel is called as a function when the process changes state.
+It gets two arguments: the process, and a string describing the change.
+*/ )
+(proc, sentinel)
+Lisp_Object proc, sentinel;
+{
+CHECK_PROCESS (proc);
+XPROCESS (proc)->sentinel = sentinel;
+return sentinel;
+}
+DEFUN ("process-sentinel", Fprocess_sentinel, Sprocess_sentinel,
+1, 1, 0 /*
+Return the sentinel of PROCESS; nil if none.
+See `set-process-sentinel' for more info on sentinels.
+*/ )
+(proc)
+Lisp_Object proc;
+{
+CHECK_PROCESS (proc);
+return XPROCESS (proc)->sentinel;
+}
+CONST char *
+signal_name (int signum)
+{
+if (signum >= 0 && signum < NSIG)
+#ifndef VMS
+return ((CONST char *) sys_siglist[signum]);
+#else
+return ((CONST char *) sys_errlist[signum]);
+#endif
+return ((CONST char *) GETTEXT ("unknown signal"));
+}
+/* Compute the Lisp form of the process status from
+the numeric status that was returned by `wait'.  */
+static void
+update_status_from_wait_code (struct Lisp_Process *p, WAITTYPE *w_fmh)
+{
+/* C compiler lossage when attempting to pass w directly */
+WAITTYPE w = *w_fmh;
+if (WIFSTOPPED (w))
+{
+p->status_symbol = Qstop;
+p->exit_code = WSTOPSIG (w);
+p->core_dumped = 0;
+}
+else if (WIFEXITED (w))
+{
+p->status_symbol = Qexit;
+p->exit_code = WRETCODE (w);
+p->core_dumped = ((WCOREDUMP (w)) ? 1 : 0);
+}
+else if (WIFSIGNALED (w))
+{
+p->status_symbol = Qsignal;
+p->exit_code = (int) WTERMSIG (w);
+p->core_dumped = ((WCOREDUMP (w)) ? 1 : 0);
+}
+else
+{
+p->status_symbol = Qrun;
+p->exit_code = 0;
+}
+}
+void
+update_process_status (Lisp_Object p,
+		       Lisp_Object status_symbol,
+		       int exit_code,
+		       int core_dumped)
+{
+XPROCESS (p)->tick++;
+process_tick++;
+XPROCESS (p)->status_symbol = status_symbol;
+XPROCESS (p)->exit_code = exit_code;
+XPROCESS (p)->core_dumped = core_dumped;
+}
+#ifdef SIGCHLD
+#define MAX_EXITED_PROCESSES 1000
+static volatile pid_t exited_processes[MAX_EXITED_PROCESSES];
+static volatile WAITTYPE exited_processes_status[MAX_EXITED_PROCESSES];
+static volatile int exited_processes_index;
+static volatile int sigchld_happened;
+/* For any processes that have changed status and are recorded
+and such, update the corresponding struct Lisp_Process.
+We separate this from record_exited_processes() so that
+we never have to call this function from within a signal
+handler.  We block SIGCHLD in case record_exited_processes()
+is called from a signal handler. */
+static void
+reap_exited_processes (void)
+{
+int i;
+struct Lisp_Process *p;
+EMACS_BLOCK_SIGNAL (SIGCHLD);
+for (i = 0; i < exited_processes_index; i++)
+{
+int pid = exited_processes[i];
+WAITTYPE w = exited_processes_status[i];
+/* Find the process that signaled us, and record its status.  */
+p = 0;
+{
+Lisp_Object tail;
+	LIST_LOOP (tail, Vprocess_list)
+	  {
+	    Lisp_Object proc = XCAR (tail);
+	    p = XPROCESS (proc);
+	    if (INTP (p->pid) && XINT (p->pid) == pid)
+	      break;
+	    p = 0;
+	  }
+}
+if (p)
+	{
+	  /* Change the status of the process that was found.  */
+	  p->tick++;
+	  process_tick++;
+	  update_status_from_wait_code (p, &w);
+/* If process has terminated, stop waiting for its output.  */
+	  if (WIFSIGNALED (w) || WIFEXITED (w))
+	    {
+	      if (p->infd >= 0)
+		{
+		  /* We can't just call event_stream->unselect_process_cb (p)
+		     here, because that calls XtRemoveInput, which is not
+		     necessarily reentrant, so we can't call this at interrupt
+		     level.
+		   */
+		}
+	    }
+	}
+else
+	{
+/* There was no asynchronous process found for that id.  Check
+	     if we have a synchronous process. Only set sync process status
+	     if there is one, so we work OK with the waitpid() call in
+	     wait_for_termination(). */
+	  if (synch_process_alive != 0)
+	    { /* Set the global sync process status variables. */
+	      synch_process_alive = 0;
+	      /* Report the status of the synchronous process.  */
+	      if (WIFEXITED (w))
+		synch_process_retcode = WRETCODE (w);
+	      else if (WIFSIGNALED (w))
+		synch_process_death = signal_name (WTERMSIG (w));
+	    }
+}
+}
+exited_processes_index = 0;
+EMACS_UNBLOCK_SIGNAL (SIGCHLD);
+}
+/* On receipt of a signal that a child status has changed,
+loop asking about children with changed statuses until
+the system says there are no more.  All we do is record
+the processes and wait status.
+This function could be called from within the SIGCHLD
+handler, so it must be completely reentrant.  When
+not called from a SIGCHLD handler, BLOCK_SIGCHLD should
+be non-zero so that SIGCHLD is blocked while this
+function is running. (This is necessary so avoid
+race conditions with the SIGCHLD_HAPPENED flag). */
+static void
+record_exited_processes (int block_sigchld)
+{
+if (block_sigchld)
+EMACS_BLOCK_SIGNAL (SIGCHLD);
+while (sigchld_happened)
+{
+int pid;
+WAITTYPE w;
+/* Keep trying to get a status until we get a definitive result.  */
+do
+	{
+	  errno = 0;
+#ifdef WNOHANG
+#  ifndef WUNTRACED
+#    define WUNTRACED 0
+#  endif /* not WUNTRACED */
+#  ifdef HAVE_WAITPID
+	  pid = waitpid ((pid_t) -1, &w, WNOHANG | WUNTRACED);
+#  else
+	  pid = wait3 (&w, WNOHANG | WUNTRACED, 0);
+#  endif
+#else /* not WNOHANG */
+	  pid = wait (&w);
+#endif /* not WNOHANG */
+	}
+while (pid <= 0 && errno == EINTR);
+if (pid <= 0)
+	break;
+if (exited_processes_index < MAX_EXITED_PROCESSES)
+	{
+	  exited_processes[exited_processes_index] = pid;
+	  exited_processes_status[exited_processes_index] = w;
+	  exited_processes_index++;
+	}
+/* On systems with WNOHANG, we just ignore the number
+	 of times that SIGCHLD was signalled, and keep looping
+	 until there are no more processes to wait on.  If we
+	 don't have WNOHANG, we have to rely on the count in
+	 SIGCHLD_HAPPENED. */
+#ifndef WNOHANG
+sigchld_happened--;
+#endif /* not WNOHANG */
+}
+sigchld_happened = 0;
+if (block_sigchld)
+EMACS_UNBLOCK_SIGNAL (SIGCHLD);
+}
+/** USG WARNING:  Although it is not obvious from the documentation
+in signal(2), on a USG system the SIGCLD handler MUST NOT call
+signal() before executing at least one wait(), otherwise the handler
+will be called again, resulting in an infinite loop.  The relevant
+portion of the documentation reads "SIGCLD signals will be queued
+and the signal-catching function will be continually reentered until
+the queue is empty".  Invoking signal() causes the kernel to reexamine
+the SIGCLD queue.   Fred Fish, UniSoft Systems Inc.
+(Note that now this only applies in SYS V Release 2 and before.
+On SYS V Release 3, we use sigset() to set the signal handler for
+the first time, and so we don't have to reestablish the signal handler
+in the handler below.  On SYS V Release 4, we don't get this weirdo
+behavior when we use sigaction(), which we do use.) */
+static SIGTYPE
+sigchld_handler (int signo)
+{
+#ifdef OBNOXIOUS_SYSV_SIGCLD_BEHAVIOR
+int old_errno = errno;
+sigchld_happened++;
+record_exited_processes (0);
+errno = old_errno;
+#else
+sigchld_happened++;
+#endif
+signal_fake_event ();
+/* WARNING - must come after wait3() for USG systems */
+EMACS_REESTABLISH_SIGNAL (signo, sigchld_handler);
+SIGRETURN;
+}
+#endif /* SIGCHLD */
+/* Return a string describing a process status list.  */
+static Lisp_Object
+status_message (struct Lisp_Process *p)
+{
+Lisp_Object symbol = p->status_symbol;
+int code = p->exit_code;
+int coredump = p->core_dumped;
+Lisp_Object string, string2;
+if (EQ (symbol, Qsignal) || EQ (symbol, Qstop))
+{
+string = build_string (signal_name (code));
+if (coredump)
+	string2 = build_translated_string (" (core dumped)\n");
+else
+	string2 = build_string ("\n");
+set_string_char (XSTRING (string), 0,
+		       DOWNCASE (current_buffer,
+				 string_char (XSTRING (string), 0)));
+return concat2 (string, string2);
+}
+else if (EQ (symbol, Qexit))
+{
+if (code == 0)
+	return build_translated_string ("finished\n");
+string = Fnumber_to_string (make_int (code));
+if (coredump)
+	string2 = build_translated_string (" (core dumped)\n");
+else
+	string2 = build_string ("\n");
+return concat2 (build_translated_string ("exited abnormally with code "),
+		      concat2 (string, string2));
+}
+else
+return Fcopy_sequence (Fsymbol_name (symbol));
+}
+/* Tell status_notify() to check for terminated processes.  We do this
+because on some systems we sometimes miss SIGCHLD calls. (Not sure
+why.) */
+void
+kick_status_notify (void)
+{
+process_tick++;
+}
+/* Report all recent events of a change in process status
+(either run the sentinel or output a message).
+This is done while Emacs is waiting for keyboard input.  */
+void
+status_notify (void)
+{
+/* This function can GC */
+Lisp_Object tail = Qnil;
+Lisp_Object symbol = Qnil;
+Lisp_Object msg = Qnil;
+struct gcpro gcpro1, gcpro2, gcpro3;
+/* process_tick is volatile, so we have to remember it now.
+Otherwise, we get a race condition is SIGCHLD happens during
+this function.
+(Actually, this is not the case anymore.  The code to
+update the process structures has been moved out of the
+SIGCHLD handler.  But for the moment I'm leaving this
+stuff in -- it can't hurt.) */
+int temp_process_tick;
+#ifdef SIGCHLD
+#ifndef OBNOXIOUS_SYSV_SIGCLD_BEHAVIOR
+record_exited_processes (1);
+#endif
+reap_exited_processes ();
+#endif
+temp_process_tick = process_tick;
+if (update_tick == temp_process_tick)
+return;
+/* We need to gcpro tail; if read_process_output calls a filter
+which deletes a process and removes the cons to which tail points
+from Vprocess_alist, and then causes a GC, tail is an unprotected
+reference.  */
+GCPRO3 (tail, symbol, msg);
+for (tail = Vprocess_list; CONSP (tail); tail = XCDR (tail))
+{
+Lisp_Object proc = XCAR (tail);
+struct Lisp_Process *p = XPROCESS (proc);
+/* p->tick is also volatile.  Same thing as above applies. */
+int this_process_tick;
+#ifdef HAVE_WAITPID
+/* #### extra check for terminated processes, in case a SIGCHLD
+	 got missed (this seems to happen sometimes, I'm not sure why).
+*/
+{
+	WAITTYPE w;
+#ifdef SIGCHLD
+	EMACS_BLOCK_SIGNAL (SIGCHLD);
+#endif
+	if (INTP (p->pid) &&
+	    waitpid (XINT (p->pid), &w, WNOHANG) == XINT (p->pid))
+	  {
+	    p->tick++;
+	    update_status_from_wait_code (p, &w);
+	  }
+#ifdef SIGCHLD
+	EMACS_UNBLOCK_SIGNAL (SIGCHLD);
+#endif
+}
+#endif
+this_process_tick = p->tick;
+if (this_process_tick != p->update_tick)
+	{
+	  p->update_tick = this_process_tick;
+	  /* If process is still active, read any output that remains.  */
+while (!EQ (p->filter, Qt)
+		 && read_process_output (proc) > 0)
+;
+	  /* Get the text to use for the message.  */
+	  msg = status_message (p);
+	  /* If process is terminated, deactivate it or delete it.  */
+	  symbol = p->status_symbol;
+	  if (EQ (symbol, Qsignal)
+|| EQ (symbol, Qexit))
+	    {
+	      if (delete_exited_processes)
+		remove_process (proc);
+	      else
+		deactivate_process (proc);
+	    }
+	  /* Now output the message suitably.  */
+	  if (!NILP (p->sentinel))
+	    exec_sentinel (proc, msg);
+	  /* Don't bother with a message in the buffer
+	     when a process becomes runnable.  */
+	  else if (!EQ (symbol, Qrun) && !NILP (p->buffer))
+	    {
+	      Lisp_Object old_read_only = Qnil;
+	      Lisp_Object old = Fcurrent_buffer ();
+	      Bufpos opoint;
+struct gcpro ngcpro1, ngcpro2;
+	      /* Avoid error if buffer is deleted
+		 (probably that's why the process is dead, too) */
+	      if (!BUFFER_LIVE_P (XBUFFER (p->buffer)))
+		continue;
+NGCPRO2 (old, old_read_only);
+	      Fset_buffer (p->buffer);
+	      opoint = BUF_PT (current_buffer);
+	      /* Insert new output into buffer
+		 at the current end-of-output marker,
+		 thus preserving logical ordering of input and output.  */
+	      if (XMARKER (p->mark)->buffer)
+		BUF_SET_PT (current_buffer, marker_position (p->mark));
+	      else
+		BUF_SET_PT (current_buffer, BUF_ZV (current_buffer));
+	      if (BUF_PT (current_buffer) <= opoint)
+		opoint += (string_char_length (XSTRING (msg))
++ string_char_length (XSTRING (p->name))
++ 10);
+	      old_read_only = current_buffer->read_only;
+	      current_buffer->read_only = Qnil;
+	      buffer_insert_c_string (current_buffer, "\nProcess ");
+	      Finsert (1, &p->name);
+	      buffer_insert_c_string (current_buffer, " ");
+	      Finsert (1, &msg);
+	      current_buffer->read_only = old_read_only;
+	      Fset_marker (p->mark, make_int (BUF_PT (current_buffer)),
+			   p->buffer);
+	      BUF_SET_PT (current_buffer, opoint);
+	      Fset_buffer (old);
+NUNGCPRO;
+	    }
+	}
+} /* end for */
+/* in case buffers use %s in modeline-format */
+MARK_MODELINE_CHANGED;
+redisplay ();
+update_tick = temp_process_tick;
+UNGCPRO;
+}
+DEFUN ("process-status", Fprocess_status, Sprocess_status, 1, 1, 0 /*
+Return the status of PROCESS.
+This is a symbol, one of these:
+run  -- for a process that is running.
+stop -- for a process stopped but continuable.
+exit -- for a process that has exited.
+signal -- for a process that has got a fatal signal.
+open -- for a network stream connection that is open.
+closed -- for a network stream connection that is closed.
+nil -- if arg is a process name and no such process exists.
+PROCESS may be a process, a buffer, the name of a process or buffer, or
+nil, indicating the current buffer's process.
+*/ )
+(proc)
+Lisp_Object proc;
+{
+Lisp_Object status;
+if (STRINGP (proc))
+proc = Fget_process (proc);
+else
+proc = get_process (proc);
+if (NILP (proc))
+return proc;
+status = XPROCESS (proc)->status_symbol;
+if (network_connection_p (proc))
+{
+if (EQ (status, Qrun))
+	status = Qopen;
+else if (EQ (status, Qexit))
+	status = Qclosed;
+}
+return (status);
+}
+DEFUN ("process-exit-status", Fprocess_exit_status, Sprocess_exit_status,
+1, 1, 0 /*
+Return the exit status of PROCESS or the signal number that killed it.
+If PROCESS has not yet exited or died, return 0.
+*/ )
+(proc)
+Lisp_Object proc;
+{
+CHECK_PROCESS (proc);
+return (make_int (XPROCESS (proc)->exit_code));
+}
+#ifdef SIGNALS_VIA_CHARACTERS
+/* Get signal character to send to process if SIGNALS_VIA_CHARACTERS */
+static int
+process_signal_char (int tty_fd, int signo)
+{
+/* If it's not a tty, pray that these default values work */
+if (!isatty(tty_fd)) {
+#define CNTL(ch) (037 & (ch))
+switch (signo)
+{
+case SIGINT:  return CNTL('C');
+case SIGQUIT: return CNTL('\\');
+#ifdef SIGTSTP
+case SIGTSTP: return CNTL('Z');
+#endif
+}
+}
+#ifdef HAVE_TERMIOS
+/* TERMIOS is the latest and bestest, and seems most likely to work.
+If the system has it, use it. */
+{
+struct termios t;
+tcgetattr (tty_fd, &t);
+switch (signo)
+{
+case SIGINT:  return t.c_cc[VINTR];
+case SIGQUIT: return t.c_cc[VQUIT];
+#  if defined (VSWTCH) && !defined (PREFER_VSUSP)
+case SIGTSTP: return t.c_cc[VSWTCH];
+#  else
+case SIGTSTP: return t.c_cc[VSUSP];
+#  endif
+}
+}
+# elif defined (TIOCGLTC) && defined (TIOCGETC) /* not HAVE_TERMIOS */
+{
+/* On Berkeley descendants, the following IOCTL's retrieve the
+current control characters.  */
+struct tchars c;
+struct ltchars lc;
+switch (signo)
+{
+case SIGINT:  ioctl (tty_fd, TIOCGETC, &c);  return c.t_intrc;
+case SIGQUIT: ioctl (tty_fd, TIOCGETC, &c);  return c.t_quitc;
+#  ifdef SIGTSTP
+case SIGTSTP: ioctl (tty_fd, TIOCGLTC, &lc); return lc.t_suspc;
+#  endif /* SIGTSTP */
+}
+}
+# elif defined (TCGETA) /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
+{
+/* On SYSV descendants, the TCGETA ioctl retrieves the current
+control characters.  */
+struct termio t;
+ioctl (tty_fd, TCGETA, &t);
+switch (signo) {
+case SIGINT:  return t.c_cc[VINTR];
+case SIGQUIT: return t.c_cc[VQUIT];
+#  ifdef SIGTSTP
+case SIGTSTP: return t.c_cc[VSWTCH];
+#  endif /* SIGTSTP */
+}
+}
+# else /* ! defined (TCGETA) */
+#error ERROR! Using SIGNALS_VIA_CHARACTERS, but not (TIOCGLTC && TIOCGETC) || TCGETA
+/* If your system configuration files define SIGNALS_VIA_CHARACTERS,
+you'd better be using one of the alternatives above!  */
+# endif /* ! defined (TCGETA) */
+return '\0';
+}
+#endif /* SIGNALS_VIA_CHARACTERS */
+/* send a signal number SIGNO to PROCESS.
+CURRENT_GROUP means send to the process group that currently owns
+the terminal being used to communicate with PROCESS.
+This is used for various commands in shell mode.
+If NOMSG is zero, insert signal-announcements into process's buffers
+right away.
+If we can, we try to signal PROCESS by sending control characters
+down the pty.  This allows us to signal inferiors who have changed
+their uid, for which killpg would return an EPERM error.  */
+static void
+process_send_signal (Lisp_Object process0, int signo,
+int current_group, int nomsg)
+{
+/* This function can GC */
+Lisp_Object proc = get_process (process0);
+struct Lisp_Process *p = XPROCESS (proc);
+int gid;
+int no_pgrp = 0;
+if (network_connection_p (proc))
+error ("Network connection %s is not a subprocess",
+	   string_data (XSTRING (p->name)));
+if (p->infd < 0)
+error ("Process %s is not active",
+	   string_data (XSTRING (p->name)));
+if (!p->pty_flag)
+current_group = 0;
+/* If we are using pgrps, get a pgrp number and make it negative.  */
+if (current_group)
+{
+#ifdef SIGNALS_VIA_CHARACTERS
+/* If possible, send signals to the entire pgrp
+	 by sending an input character to it.  */
+{
+char sigchar = process_signal_char(p->subtty, signo);
+if (sigchar) {
+send_process (proc, Qnil, (Bufbyte *) &sigchar, 0, 1);
+return;
+}
+}
+#endif /* ! defined (SIGNALS_VIA_CHARACTERS) */
+#ifdef TIOCGPGRP
+/* Get the pgrp using the tty itself, if we have that.
+	 Otherwise, use the pty to get the pgrp.
+	 On pfa systems, saka@pfu.fujitsu.co.JP writes:
+	 "TIOCGPGRP symbol defined in sys/ioctl.h at E50.
+	 But, TIOCGPGRP does not work on E50 ;-P works fine on E60"
+	 His patch indicates that if TIOCGPGRP returns an error, then
+	 we should just assume that p->pid is also the process group id.  */
+{
+	int err;
+err = ioctl ( (p->subtty != -1 ? p->subtty : p->infd), TIOCGPGRP, &gid);
+#ifdef pfa
+	if (err == -1)
+	  gid = - XINT (p->pid);
+#endif /* ! defined (pfa) */
+}
+if (gid == -1)
+	no_pgrp = 1;
+else
+	gid = - gid;
+#else /* ! defined (TIOCGPGRP ) */
+/* Can't select pgrps on this system, so we know that
+	 the child itself heads the pgrp.  */
+gid = - XINT (p->pid);
+#endif /* ! defined (TIOCGPGRP ) */
+}
+else
+gid = - XINT (p->pid);
+switch (signo)
+{
+#ifdef SIGCONT
+case SIGCONT:
+p->status_symbol = Qrun;
+p->exit_code = 0;
+p->tick++;
+process_tick++;
+if (!nomsg)
+	status_notify ();
+break;
+#endif /* ! defined (SIGCONT) */
+case SIGINT:
+#ifdef VMS
+send_process (proc, Qnil, (Bufbyte *) "\003", 0,
+		    1); /* ^C */
+goto whoosh;
+#endif
+case SIGQUIT:
+#ifdef VMS
+send_process (proc, Qnil, (Bufbyte *) "\031", 0,
+		    1); /* ^Y */
+goto whoosh;
+#endif
+case SIGKILL:
+#ifdef VMS
+sys$forcex (&(XINT (p->pid)), 0, 1);
+whoosh:
+#endif
+flush_pending_output (p->infd);
+break;
+}
+/* If we don't have process groups, send the signal to the immediate
+subprocess.  That isn't really right, but it's better than any
+obvious alternative.  */
+if (no_pgrp)
+{
+kill (XINT (p->pid), signo);
+return;
+}
+/* gid may be a pid, or minus a pgrp's number */
+#ifdef TIOCSIGSEND
+if (current_group)
+ioctl (p->infd, TIOCSIGSEND, signo);
+else
+{
+gid = - XINT (p->pid);
+kill (gid, signo);
+}
+#else /* ! defined (TIOCSIGSEND) */
+EMACS_KILLPG (-gid, signo);
+#endif /* ! defined (TIOCSIGSEND) */
+}
+DEFUN ("interrupt-process", Finterrupt_process, Sinterrupt_process, 0, 2, 0 /*
+Interrupt process PROCESS.  May be process or name of one.
+Nil or no arg means current buffer's process.
+Second arg CURRENT-GROUP non-nil means send signal to
+the current process-group of the process's controlling terminal
+rather than to the process's own process group.
+If the process is a shell, this means interrupt current subjob
+rather than the shell.
+*/ )
+(process, current_group)
+Lisp_Object process, current_group;
+{
+/* This function can GC */
+process_send_signal (process, SIGINT, !NILP (current_group), 0);
+return process;
+}
+DEFUN ("kill-process", Fkill_process, Skill_process, 0, 2, 0 /*
+Kill process PROCESS.  May be process or name of one.
+See function `interrupt-process' for more details on usage.
+*/ )
+(process, current_group)
+Lisp_Object process, current_group;
+{
+/* This function can GC */
+process_send_signal (process, SIGKILL, !NILP (current_group),
+		       0);
+return process;
+}
+DEFUN ("quit-process", Fquit_process, Squit_process, 0, 2, 0 /*
+Send QUIT signal to process PROCESS.  May be process or name of one.
+See function `interrupt-process' for more details on usage.
+*/ )
+(process, current_group)
+Lisp_Object process, current_group;
+{
+/* This function can GC */
+process_send_signal (process, SIGQUIT, !NILP (current_group),
+		       0);
+return process;
+}
+DEFUN ("stop-process", Fstop_process, Sstop_process, 0, 2, 0 /*
+Stop process PROCESS.  May be process or name of one.
+See function `interrupt-process' for more details on usage.
+*/ )
+(process, current_group)
+Lisp_Object process, current_group;
+{
+/* This function can GC */
+#ifndef SIGTSTP
+error ("no SIGTSTP support");
+#else
+process_send_signal (process, SIGTSTP, !NILP (current_group),
+		       0);
+#endif
+return process;
+}
+DEFUN ("continue-process", Fcontinue_process, Scontinue_process, 0, 2, 0 /*
+Continue process PROCESS.  May be process or name of one.
+See function `interrupt-process' for more details on usage.
+*/ )
+(process, current_group)
+Lisp_Object process, current_group;
+{
+/* This function can GC */
+#ifdef SIGCONT
+process_send_signal (process, SIGCONT, !NILP (current_group),
+			 0);
+#else
+error ("no SIGCONT support");
+#endif
+return process;
+}
+DEFUN ("signal-process", Fsignal_process, Ssignal_process,
+2, 2, "nProcess number: \nnSignal code: " /*
+Send the process with process id PID the signal with code SIGCODE.
+PID must be an integer.  The process need not be a child of this Emacs.
+SIGCODE may be an integer, or a symbol whose name is a signal name.
+*/ )
+(pid, sigcode)
+Lisp_Object pid, sigcode;
+{
+CHECK_INT (pid);
+#define handle_signal(NAME, VALUE)			\
+else if (!strcmp ((CONST char *) name, NAME))		\
+XSETINT (sigcode, VALUE)
+if (INTP (sigcode))
+;
+else
+{
+Bufbyte *name;
+CHECK_SYMBOL (sigcode);
+name = string_data (XSYMBOL (sigcode)->name);
+if (0)
+	;
+#ifdef SIGHUP
+handle_signal ("SIGHUP", SIGHUP);
+#endif
+#ifdef SIGINT
+handle_signal ("SIGINT", SIGINT);
+#endif
+#ifdef SIGQUIT
+handle_signal ("SIGQUIT", SIGQUIT);
+#endif
+#ifdef SIGILL
+handle_signal ("SIGILL", SIGILL);
+#endif
+#ifdef SIGABRT
+handle_signal ("SIGABRT", SIGABRT);
+#endif
+#ifdef SIGEMT
+handle_signal ("SIGEMT", SIGEMT);
+#endif
+#ifdef SIGKILL
+handle_signal ("SIGKILL", SIGKILL);
+#endif
+#ifdef SIGFPE
+handle_signal ("SIGFPE", SIGFPE);
+#endif
+#ifdef SIGBUS
+handle_signal ("SIGBUS", SIGBUS);
+#endif
+#ifdef SIGSEGV
+handle_signal ("SIGSEGV", SIGSEGV);
+#endif
+#ifdef SIGSYS
+handle_signal ("SIGSYS", SIGSYS);
+#endif
+#ifdef SIGPIPE
+handle_signal ("SIGPIPE", SIGPIPE);
+#endif
+#ifdef SIGALRM
+handle_signal ("SIGALRM", SIGALRM);
+#endif
+#ifdef SIGTERM
+handle_signal ("SIGTERM", SIGTERM);
+#endif
+#ifdef SIGURG
+handle_signal ("SIGURG", SIGURG);
+#endif
+#ifdef SIGSTOP
+handle_signal ("SIGSTOP", SIGSTOP);
+#endif
+#ifdef SIGTSTP
+handle_signal ("SIGTSTP", SIGTSTP);
+#endif
+#ifdef SIGCONT
+handle_signal ("SIGCONT", SIGCONT);
+#endif
+#ifdef SIGCHLD
+handle_signal ("SIGCHLD", SIGCHLD);
+#endif
+#ifdef SIGTTIN
+handle_signal ("SIGTTIN", SIGTTIN);
+#endif
+#ifdef SIGTTOU
+handle_signal ("SIGTTOU", SIGTTOU);
+#endif
+#ifdef SIGIO
+handle_signal ("SIGIO", SIGIO);
+#endif
+#ifdef SIGXCPU
+handle_signal ("SIGXCPU", SIGXCPU);
+#endif
+#ifdef SIGXFSZ
+handle_signal ("SIGXFSZ", SIGXFSZ);
+#endif
+#ifdef SIGVTALRM
+handle_signal ("SIGVTALRM", SIGVTALRM);
+#endif
+#ifdef SIGPROF
+handle_signal ("SIGPROF", SIGPROF);
+#endif
+#ifdef SIGWINCH
+handle_signal ("SIGWINCH", SIGWINCH);
+#endif
+#ifdef SIGINFO
+handle_signal ("SIGINFO", SIGINFO);
+#endif
+#ifdef SIGUSR1
+handle_signal ("SIGUSR1", SIGUSR1);
+#endif
+#ifdef SIGUSR2
+handle_signal ("SIGUSR2", SIGUSR2);
+#endif
+else
+	error ("Undefined signal name %s", name);
+}
+#undef handle_signal
+#ifdef WINDOWSNT
+/* Only works for kill-type signals */
+return make_int (win32_kill_process (XINT (pid), XINT (sigcode)));
+#else
+return make_int (kill (XINT (pid), XINT (sigcode)));
+#endif
+}
+DEFUN ("process-send-eof", Fprocess_send_eof, Sprocess_send_eof, 0, 1, 0 /*
+Make PROCESS see end-of-file in its input.
+PROCESS may be a process, a buffer, the name of a process or buffer, or
+nil, indicating the current buffer's process.
+If PROCESS is a network connection, or is a process communicating
+through a pipe (as opposed to a pty), then you cannot send any more
+text to PROCESS after you call this function.
+*/ )
+(process)
+Lisp_Object process;
+{
+/* This function can GC */
+Lisp_Object proc;
+proc = get_process (process);
+/* Make sure the process is really alive.  */
+if (! EQ (XPROCESS (proc)->status_symbol, Qrun))
+error ("Process %s not running",
+	   string_data (XSTRING (XPROCESS (proc)->name)));
+#ifdef VMS
+send_process (proc, Qnil, (Bufbyte *) "\032", 0, 1);   /* ^Z */
+#else
+if (XPROCESS (proc)->pty_flag)
+{
+/* #### get_eof_char simply doesn't return the correct character
+here.  Maybe it is needed to determine the right eof
+character in init_process_fds but here it simply screws
+things up. */
+#if 0
+Bufbyte eof_char = get_eof_char (XPROCESS (proc));
+send_process (proc, Qnil, &eof_char, 0, 1);
+#else
+send_process (proc, Qnil, (CONST Bufbyte *) "\004", 0, 1);
+#endif
+}
+else
+{
+close (XPROCESS (proc)->outfd);
+XPROCESS (proc)->outfd = open (NULL_DEVICE, O_WRONLY, 0);
+}
+#endif /* !VMS */
+return process;
+}
+/************************************************************************/
+/*                          deleting a process                          */
+/************************************************************************/
+void
+deactivate_process (Lisp_Object proc)
+{
+int inchannel, outchannel;
+struct Lisp_Process *p = XPROCESS (proc);
+SIGTYPE (*old_sigpipe) (int) = 0;
+inchannel = p->infd;
+outchannel = p->outfd;
+/* closing the outstream could result in SIGPIPE, so ignore it. */
+old_sigpipe =
+(SIGTYPE (*) (int)) signal (SIGPIPE, SIG_IGN);
+if (!NILP (p->instream))
+Lstream_close (XLSTREAM (p->instream));
+if (!NILP (p->outstream))
+Lstream_close (XLSTREAM (p->outstream));
+signal (SIGPIPE, old_sigpipe);
+if (inchannel >= 0)
+{
+/* Beware SIGCHLD hereabouts. */
+flush_pending_output (inchannel);
+close_descriptor_pair (inchannel, outchannel);
+if (!NILP (p->pid))
+	{
+	  /* It's possible that we got as far in the process-creation
+	     process as creating the descriptors but didn't get so
+	     far as selecting the process for input.  In this
+	     case, p->pid is nil: p->pid is set at the same time that
+	     the process is selected for input. */
+#ifdef VMS
+	  {
+	    VMS_PROC_STUFF *get_vms_process_pointer (), *vs;
+	    if (outchannel >= 0)
+	      sys$dassgn (outchannel);
+	    vs = get_vms_process_pointer (XINT (p->pid));
+	    if (vs)
+	      give_back_vms_process_stuff (vs);
+	  }
+#endif /* VMS */
+	  /* Must call this before setting the file descriptors to 0 */
+	  event_stream_unselect_process (p);
+	}
+p->infd  = -1;
+p->outfd = -1;
+descriptor_to_process[inchannel] = Qnil;
+}
+}
+static void
+remove_process (Lisp_Object proc)
+{
+Vprocess_list = delq_no_quit (proc, Vprocess_list);
+Fset_marker (XPROCESS (proc)->mark, Qnil, Qnil);
+deactivate_process (proc);
+}
+DEFUN ("delete-process", Fdelete_process, Sdelete_process, 1, 1, 0 /*
+Delete PROCESS: kill it and forget about it immediately.
+PROCESS may be a process or the name of one, or a buffer name.
+*/ )
+(proc)
+Lisp_Object proc;
+{
+/* This function can GC */
+struct Lisp_Process *p;
+proc = get_process (proc);
+p = XPROCESS (proc);
+if (network_connection_p (proc))
+{
+p->status_symbol = Qexit;
+p->exit_code = 0;
+p->core_dumped = 0;
+p->tick++;
+process_tick++;
+}
+else if (p->infd >= 0)
+{
+Fkill_process (proc, Qnil);
+/* Do this now, since remove_process will make sigchld_handler do nothing.  */
+p->status_symbol = Qsignal;
+p->exit_code = SIGKILL;
+p->core_dumped = 0;
+p->tick++;
+process_tick++;
+status_notify ();
+}
+remove_process (proc);
+return Qnil;
+}
+/* Kill all processes associated with `buffer'.
+If `buffer' is nil, kill all processes  */
+void
+kill_buffer_processes (Lisp_Object buffer)
+{
+Lisp_Object tail;
+for (tail = Vprocess_list; GC_CONSP (tail);
+tail = XCDR (tail))
+{
+Lisp_Object proc = XCAR (tail);
+if (GC_PROCESSP (proc)
+	  && (GC_NILP (buffer) || GC_EQ (XPROCESS (proc)->buffer, buffer)))
+	{
+	  if (network_connection_p (proc))
+	    Fdelete_process (proc);
+	  else if (XPROCESS (proc)->infd >= 0)
+	    process_send_signal (proc, SIGHUP, 0, 1);
+	}
+}
+}
+#if 0 /* Unused */
+int
+count_active_processes (void)
+{
+Lisp_Object tail;
+int count = 0;
+for (tail = Vprocess_list; CONSP (tail); tail = XCDR (tail))
+{
+Lisp_Object status = XPROCESS (XCAR (tail))->status_symbol;
+if ((EQ (status, Qrun) || EQ (status, Qstop)))
+	count++;
+}
+return count;
+}
+#endif /* Unused */
+DEFUN ("process-kill-without-query", Fprocess_kill_without_query,
+Sprocess_kill_without_query, 1, 2, 0 /*
+Say no query needed if PROCESS is running when Emacs is exited.
+Optional second argument if non-nil says to require a query.
+Value is t if a query was formerly required.
+*/ )
+(proc, require_query_p)
+Lisp_Object proc, require_query_p;
+{
+int tem;
+CHECK_PROCESS (proc);
+tem = XPROCESS (proc)->kill_without_query;
+XPROCESS (proc)->kill_without_query = NILP (require_query_p);
+return (tem ? Qnil : Qt);
+}
+DEFUN ("process-kill-without-query-p", Fprocess_kill_without_query_p,
+Sprocess_kill_without_query_p, 1, 1, 0 /*
+Whether PROC will be killed without query if running when emacs is exited.
+*/ )
+(proc)
+Lisp_Object proc;
+{
+CHECK_PROCESS (proc);
+return (XPROCESS (proc)->kill_without_query ? Qt : Qnil);
+}
+/* This is not named init_process in order to avoid a conflict with NS 3.3 */
+void
+init_xemacs_process (void)
+{
+int i;
+#ifdef SIGCHLD
+# ifndef CANNOT_DUMP
+if (! noninteractive || initialized)
+# endif
+signal (SIGCHLD, sigchld_handler);
+#endif /* SIGCHLD */
+Vprocess_list = Qnil;
+for (i = 0; i < MAXDESC; i++)
+{
+descriptor_to_process[i] = Qnil;
+proc_buffered_char[i] = -1;
+}
+}
+#if 0
+xxDEFUN ("process-connection", Fprocess_connection, Sprocess_connection,
+	 0, 1, 0 /*
+Return the connection type of `PROCESS'.  This can be nil (pipe),
+t or pty (pty) or stream (socket connection).
+*/ )
+(process)
+Lisp_Object process;
+{
+return XPROCESS (process)->type;
+}
+#endif /* 0 */
+void
+syms_of_process (void)
+{
+defsymbol (&Qprocessp, "processp");
+defsymbol (&Qrun, "run");
+defsymbol (&Qstop, "stop");
+defsymbol (&Qsignal, "signal");
+/* Qexit is already defined by syms_of_eval
+* defsymbol (&Qexit, "exit");
+*/
+defsymbol (&Qopen, "open");
+defsymbol (&Qclosed, "closed");
+defsubr (&Sprocessp);
+defsubr (&Sget_process);
+defsubr (&Sget_buffer_process);
+defsubr (&Sdelete_process);
+defsubr (&Sprocess_status);
+defsubr (&Sprocess_exit_status);
+defsubr (&Sprocess_id);
+defsubr (&Sprocess_name);
+defsubr (&Sprocess_tty_name);
+defsubr (&Sprocess_command);
+defsubr (&Sset_process_buffer);
+defsubr (&Sprocess_buffer);
+defsubr (&Sprocess_mark);
+defsubr (&Sset_process_filter);
+defsubr (&Sprocess_filter);
+defsubr (&Sset_process_window_size);
+defsubr (&Sset_process_sentinel);
+defsubr (&Sprocess_sentinel);
+defsubr (&Sprocess_kill_without_query);
+defsubr (&Sprocess_kill_without_query_p);
+defsubr (&Sprocess_list);
+defsubr (&Sstart_process_internal);
+#ifdef HAVE_SOCKETS
+defsubr (&Sopen_network_stream_internal);
+#endif /* HAVE_SOCKETS */
+defsubr (&Sprocess_send_region);
+defsubr (&Sprocess_send_string);
+defsubr (&Sinterrupt_process);
+defsubr (&Skill_process);
+defsubr (&Squit_process);
+defsubr (&Sstop_process);
+defsubr (&Scontinue_process);
+defsubr (&Sprocess_send_eof);
+defsubr (&Ssignal_process);
+/*  defsubr (&Sprocess_connection); */
+}
+void
+vars_of_process (void)
+{
+Fprovide (intern ("subprocesses"));
+#ifdef HAVE_SOCKETS
+Fprovide (intern ("network-streams"));
+#endif
+staticpro (&Vprocess_list);
+DEFVAR_BOOL ("delete-exited-processes", &delete_exited_processes /*
+*Non-nil means delete processes immediately when they exit.
+nil means don't delete them until `list-processes' is run.
+*/ );
+delete_exited_processes = 1;
+DEFVAR_LISP ("process-connection-type", &Vprocess_connection_type /*
+Control type of device used to communicate with subprocesses.
+Values are nil to use a pipe, or t or `pty' to use a pty.
+The value has no effect if the system has no ptys or if all ptys are busy:
+then a pipe is used in any case.
+The value takes effect when `start-process' is called.
+*/ );
+Vprocess_connection_type = Qt;
+}
+#endif /* not NO_SUBPROCESSES */

Mercurial > hg > xemacs-beta

comparison src/process.c @ 0:376386a54a3c r19-14