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, 1999-2011  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 /* SYSTEM_TYPE should indicate the kind of system you are using.
  30    It sets the Lisp variable system-type.  */
  31 #define SYSTEM_TYPE "usg-unix-v"
  32
  33 /* The file containing the kernel's symbol table is called /unix.  */
  34 #define KERNEL_FILE "/unix"
  35
  36 /* The kernel symbol where the load average is found is named avenrun.  */
  37 #define LDAV_SYMBOL "avenrun"
  38
  39 /* setjmp and longjmp can safely replace _setjmp and _longjmp,
  40    but they will run slower.  */
  41 #define _setjmp setjmp
  42 #define _longjmp longjmp
  43
  44 /* The docs for system V/386 suggest v.3 has sigpause, so let's try it.  */
  45 #define HAVE_SYSV_SIGPAUSE
  46
  47 /* On USG systems signal handlers return void.  */
  48 #define SIGTYPE void
  49
  50 /* Get FIONREAD from <sys/filio.h>.  Get <sys/ttold.h> to get struct tchars.
  51    But get <termio.h> first to make sure ttold.h doesn't interfere.
  52    And don't try to use SIGIO yet.  */
  53 #include <sys/wait.h>
  54
  55 #ifdef emacs
  56 #include <sys/filio.h>
  57 #include <termio.h>
  58 #include <sys/ttold.h>
  59 #include <signal.h>
  60 #include <sys/stream.h>
  61 #include <sys/stropts.h>
  62 #include <sys/termios.h>
  63 #define BROKEN_SIGIO
  64 #endif
  65
  66 /* Some SVr4s don't define NSIG in sys/signal.h for ANSI environments;
  67    instead, there's a system variable _sys_nsig.  Unfortunately, we need the
  68    constant to dimension an array.  So wire in the appropriate value here.  */
  69 #define NSIG_MINIMUM 32
  70
  71 /* We can support this.  */
  72 #define CLASH_DETECTION
  73
  74 /* Define HAVE_PTYS if the system supports pty devices.  */
  75 #define HAVE_PTYS
  76
  77 /* It is possible to receive SIGCHLD when there are no children
  78    waiting, because a previous waitsys(2) cleaned up the carcass of child
  79    without clearing the SIGCHLD pending info.  So, use a non-blocking
  80    wait3 instead, which maps to waitpid(2) in SysVr4. */
  81 #define wait3(status, options, rusage) \
  82   waitpid ((pid_t) -1, (status), (options))
  83 #define WRETCODE(w) (w >> 8)
  84
  85 /* TIOCGPGRP is broken in SysVr4, so we can't send signals to PTY
  86    subprocesses the usual way.  But TIOCSIGNAL does work for PTYs, and
  87    this is all we need.  */
  88 #define TIOCSIGSEND TIOCSIGNAL
  89
  90 /* This change means that we don't loop through allocate_pty too many
  91    times in the (rare) event of a failure.  */
  92 #define FIRST_PTY_LETTER 'z'
  93
  94 /* This sets the name of the master side of the PTY.  */
  95 #define PTY_NAME_SPRINTF strcpy (pty_name, "/dev/ptmx");
  96
  97 /* Push various streams modules onto a PTY channel.  */
  98 #define SETUP_SLAVE_PTY \
  99   if (ioctl (xforkin, I_PUSH, "ptem") == -1)    \
 100     fatal ("ioctl I_PUSH ptem", errno);         \
 101   if (ioctl (xforkin, I_PUSH, "ldterm") == -1)  \
 102     fatal ("ioctl I_PUSH ldterm", errno);       \
 103   if (ioctl (xforkin, I_PUSH, "ttcompat") == -1) \
 104     fatal ("ioctl I_PUSH ttcompat", errno);
 105
 106 /* This definition was suggested for next release.  So give it a try.  */
 107 #define HAVE_SOCKETS
 108