src/s/usg5-4-common.h

   1 /* Definitions file for GNU Emacs running on AT&T's System V Release 4
   2
   3 Copyright (C) 1987, 1990, 1999-2012  Free Software Foundation, Inc.
   4
   5 Written by James Van Artsdalen of Dell Computer Corp. james@bigtex.cactus.org.
   6 Subsequently improved for Dell 2.2 by Eric S. Raymond <esr@snark.thyrsus.com>.
   7
   8 This file is part of GNU Emacs.
   9
  10 GNU Emacs is free software: you can redistribute it and/or modify
  11 it under the terms of the GNU General Public License as published by
  12 the Free Software Foundation, either version 3 of the License, or
  13 (at your option) any later version.
  14
  15 GNU Emacs is distributed in the hope that it will be useful,
  16 but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 GNU General Public License for more details.
  19
  20 You should have received a copy of the GNU General Public License
  21 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  22
  23 /* Use the SysVr3 file for at least base configuration.  */
  24 #define USG                             /* System III, System V, etc */
  25
  26 #define USG5
  27 #define USG5_4
  28
  29 /* setjmp and longjmp can safely replace _setjmp and _longjmp,
  30    but they will run slower.  */
  31 #define _setjmp setjmp
  32 #define _longjmp longjmp
  33
  34 /* The docs for system V/386 suggest v.3 has sigpause, so let's try it.  */
  35 #define HAVE_SYSV_SIGPAUSE
  36
  37 /* Get FIONREAD from <sys/filio.h>.  Get <sys/ttold.h> to get struct tchars.
  38    But get <termio.h> first to make sure ttold.h doesn't interfere.  */
  39 #include <sys/wait.h>
  40
  41 #ifdef emacs
  42 #include <sys/filio.h>
  43 #include <termio.h>
  44 #include <sys/ttold.h>
  45 #include <signal.h>
  46 #include <sys/stream.h>
  47 #include <sys/stropts.h>
  48 #include <sys/termios.h>
  49 #endif
  50
  51 /* Some SVr4s don't define NSIG in sys/signal.h for ANSI environments;
  52    instead, there's a system variable _sys_nsig.  Unfortunately, we need the
  53    constant to dimension an array.  So wire in the appropriate value here.  */
  54 #define NSIG_MINIMUM 32
  55
  56 /* We can support this.  */
  57 #define CLASH_DETECTION
  58
  59 /* Define HAVE_PTYS if the system supports pty devices.  */
  60 #define HAVE_PTYS
  61
  62 /* It is possible to receive SIGCHLD when there are no children
  63    waiting, because a previous waitsys(2) cleaned up the carcass of child
  64    without clearing the SIGCHLD pending info.  So, use a non-blocking
  65    wait3 instead, which maps to waitpid(2) in SysVr4. */
  66 #define wait3(status, options, rusage) \
  67   waitpid ((pid_t) -1, (status), (options))
  68 #define WRETCODE(w) (w >> 8)
  69
  70 /* TIOCGPGRP is broken in SysVr4, so we can't send signals to PTY
  71    subprocesses the usual way.  But TIOCSIGNAL does work for PTYs, and
  72    this is all we need.  */
  73 #define TIOCSIGSEND TIOCSIGNAL
  74
  75 /* This change means that we don't loop through allocate_pty too many
  76    times in the (rare) event of a failure.  */
  77 #define FIRST_PTY_LETTER 'z'
  78
  79 /* This sets the name of the master side of the PTY.  */
  80 #define PTY_NAME_SPRINTF strcpy (pty_name, "/dev/ptmx");
  81
  82 /* Push various streams modules onto a PTY channel.  */
  83 #define SETUP_SLAVE_PTY \
  84   if (ioctl (xforkin, I_PUSH, "ptem") == -1)    \
  85     fatal ("ioctl I_PUSH ptem");                \
  86   if (ioctl (xforkin, I_PUSH, "ldterm") == -1)  \
  87     fatal ("ioctl I_PUSH ldterm");      \
  88   if (ioctl (xforkin, I_PUSH, "ttcompat") == -1) \
  89     fatal ("ioctl I_PUSH ttcompat");
  90
  91 /* This definition was suggested for next release.  So give it a try.  */
  92 #define HAVE_SOCKETS