Misc code tweaks.

[bpt/emacs.git] / src / s / usg5-4.h

/* Definitions file for GNU Emacs running on AT&T's System V Release 4
   Copyright (C) 1987, 1990, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
                 2006, 2007, 2008, 2009, 2010  Free Software Foundation, Inc.

This file is part of GNU Emacs.

GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 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/>.  */

/* This file written by James Van Artsdalen of Dell Computer Corporation.
 * james@bigtex.cactus.org.  Subsequently improved for Dell 2.2 by Eric
 * S. Raymond <esr@snark.thyrsus.com>.
 */

/* 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"

/*
 *	Define HAVE_TERMIO if the system provides sysV-style ioctls
 *	for terminal control.
 */

#define HAVE_TERMIO

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

/*
 * 	Define SYSV_SYSTEM_DIR to use the V.3 getdents/readir
 *	library functions.  Almost, but not quite the same as
 *	the 4.2 functions
 */
#define SYSV_SYSTEM_DIR

/* The file containing the kernel's symbol table is called /unix.  */

#define KERNEL_FILE "/unix"

/* The symbol in the kernel where the load average is found
   is named avenrun.  */

#define LDAV_SYMBOL "avenrun"

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

#define _setjmp setjmp
#define _longjmp longjmp

/* On USG systems these have different names */
#ifndef HAVE_INDEX
#define index strchr
#endif /* ! defined (HAVE_INDEX) */
#ifndef HAVE_RINDEX
#define rindex strrchr
#endif /* ! defined (HAVE_RINDEX) */

/* Use terminfo instead of termcap.  */

#define TERMINFO


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


/* If we're using the System V X port, BSD bstring functions will be handy */

#ifdef HAVE_X_WINDOWS
#define BSTRING
#endif /* HAVE_X_WINDOWS */

/* On USG systems signal handlers return void */

#define SIGTYPE void

#define ORDINARY_LINK

/* Undump with ELF */

#undef COFF

#define UNEXEC unexelf.o

/* 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.
 */

#ifndef NOT_C_CODE
#include <sys/wait.h>
#endif

#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
#define HAVE_TERMIOS

/* 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", errno);		\
  if (ioctl (xforkin, I_PUSH, "ldterm") == -1)	\
    fatal ("ioctl I_PUSH ldterm", errno);	\
  if (ioctl (xforkin, I_PUSH, "ttcompat") == -1) \
    fatal ("ioctl I_PUSH ttcompat", errno);

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

/* arch-tag: 1a0ed909-5faa-434b-b7c3-9d86c63d53a6
   (do not change this comment) */