/* Definitions file for GNU Emacs running on AT&T's System V Release 4

Copyright (C) 1987, 1990, 1999-2011  Free Software Foundation, Inc.

Written by James Van Artsdalen of Dell Computer Corp. james@bigtex.cactus.org.
Subsequently improved for Dell 2.2 by Eric S. Raymond <esr@snark.thyrsus.com>.

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 3 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.  */

/* Use the SysVr3 file for at least base configuration.  */
#define USG				/* System III, System V, etc */

#define USG5
#define USG5_4

/* SYSTEM_TYPE should indicate the kind of system you are using.
   It sets the Lisp variable system-type.  */
#define SYSTEM_TYPE "usg-unix-v"

/* setjmp and longjmp can safely replace _setjmp and _longjmp,
   but they will run slower.  */
#define _setjmp setjmp
#define _longjmp longjmp

/* The docs for system V/386 suggest v.3 has sigpause, so let's try it.  */
#define HAVE_SYSV_SIGPAUSE

/* Get FIONREAD from <sys/filio.h>.  Get <sys/ttold.h> to get struct tchars.
   But get <termio.h> first to make sure ttold.h doesn't interfere.
   And don't try to use SIGIO yet.  */
#include <sys/wait.h>

#ifdef emacs
#include <sys/filio.h>
#include <termio.h>
#include <sys/ttold.h>
#include <signal.h>
#include <sys/stream.h>
#include <sys/stropts.h>
#include <sys/termios.h>
#define BROKEN_SIGIO
#endif

/* Some SVr4s don't define NSIG in sys/signal.h for ANSI environments;
   instead, there's a system variable _sys_nsig.  Unfortunately, we need the
   constant to dimension an array.  So wire in the appropriate value here.  */
#define NSIG_MINIMUM 32

/* We can support this.  */
#define CLASH_DETECTION

/* Define HAVE_PTYS if the system supports pty devices.  */
#define HAVE_PTYS

/* It is possible to receive SIGCHLD when there are no children
   waiting, because a previous waitsys(2) cleaned up the carcass of child
   without clearing the SIGCHLD pending info.  So, use a non-blocking
   wait3 instead, which maps to waitpid(2) in SysVr4. */
#define wait3(status, options, rusage) \
  waitpid ((pid_t) -1, (status), (options))
#define WRETCODE(w) (w >> 8)

/* TIOCGPGRP is broken in SysVr4, so we can't send signals to PTY
   subprocesses the usual way.  But TIOCSIGNAL does work for PTYs, and
   this is all we need.  */
#define TIOCSIGSEND TIOCSIGNAL

/* This change means that we don't loop through allocate_pty too many
   times in the (rare) event of a failure.  */
#define FIRST_PTY_LETTER 'z'

/* This sets the name of the master side of the PTY.  */
#define PTY_NAME_SPRINTF strcpy (pty_name, "/dev/ptmx");

/* Push various streams modules onto a PTY channel.  */
#define SETUP_SLAVE_PTY \
  if (ioctl (xforkin, I_PUSH, "ptem") == -1)	\
    fatal ("ioctl I_PUSH ptem");		\
  if (ioctl (xforkin, I_PUSH, "ldterm") == -1)	\
    fatal ("ioctl I_PUSH ldterm");	\
  if (ioctl (xforkin, I_PUSH, "ttcompat") == -1) \
    fatal ("ioctl I_PUSH ttcompat");

/* This definition was suggested for next release.  So give it a try.  */
#define HAVE_SOCKETS