src/s/usg5-4.h

   1 /* Definitions file for GNU Emacs running on AT&T's System V Release 4
   2    Copyright (C) 1987, 1990, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
   3                  2006, 2007, 2008  Free Software Foundation, Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software: you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation, either version 3 of the License, or
  10 (at your option) any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 /* This file written by James Van Artsdalen of Dell Computer Corporation.
  21  * james@bigtex.cactus.org.  Subsequently improved for Dell 2.2 by Eric
  22  * S. Raymond <esr@snark.thyrsus.com>.
  23  */
  24
  25 /* Use the SysVr3 file for at least base configuration. */
  26
  27 #define USG                             /* System III, System V, etc */
  28
  29 #define USG5
  30 #define USG5_4
  31
  32 /* SYSTEM_TYPE should indicate the kind of system you are using.
  33  It sets the Lisp variable system-type.  */
  34
  35 #define SYSTEM_TYPE "usg-unix-v"
  36
  37 /*
  38  *      Define HAVE_TERMIO if the system provides sysV-style ioctls
  39  *      for terminal control.
  40  */
  41
  42 #define HAVE_TERMIO
  43
  44 /*
  45  *      Define HAVE_PTYS if the system supports pty devices.
  46  */
  47
  48 /*
  49  *      Define SYSV_SYSTEM_DIR to use the V.3 getdents/readir
  50  *      library functions.  Almost, but not quite the same as
  51  *      the 4.2 functions
  52  */
  53 #define SYSV_SYSTEM_DIR
  54
  55 /* subprocesses should be defined if you want to
  56  have code for asynchronous subprocesses
  57  (as used in M-x compile and M-x shell).
  58  This is supposed to work now on system V release 2.  */
  59
  60 #define subprocesses
  61
  62 /* The file containing the kernel's symbol table is called /unix.  */
  63
  64 #define KERNEL_FILE "/unix"
  65
  66 /* The symbol in the kernel where the load average is found
  67    is named avenrun.  */
  68
  69 #define LDAV_SYMBOL "avenrun"
  70
  71 /* Special hacks needed to make Emacs run on this system.  */
  72
  73 /*
  74  *      Make the sigsetmask function go away.  Don't know what the
  75  *      ramifications of this are, but doesn't seem possible to
  76  *      emulate it properly anyway at this point.
  77  */
  78
  79 #define sigsetmask(mask)        /* Null expansion */
  80
  81 /* setjmp and longjmp can safely replace _setjmp and _longjmp,
  82    but they will run slower.  */
  83
  84 #define _setjmp setjmp
  85 #define _longjmp longjmp
  86
  87 /* On USG systems these have different names */
  88 #ifndef HAVE_INDEX
  89 #define index strchr
  90 #endif /* ! defined (HAVE_INDEX) */
  91 #ifndef HAVE_RINDEX
  92 #define rindex strrchr
  93 #endif /* ! defined (HAVE_RINDEX) */
  94
  95 /* Compiler bug bites on many systems when default ADDR_CORRECT is used.  */
  96
  97 #define ADDR_CORRECT(x) (x)
  98
  99 /* Use terminfo instead of termcap.  */
 100
 101 #define TERMINFO
 102
 103
 104 /* The docs for system V/386 suggest v.3 has sigpause,
 105    so let's give it a try.  */
 106 #define HAVE_SYSV_SIGPAUSE
 107
 108
 109 /* If we're using the System V X port, BSD bstring functions will be handy */
 110
 111 #ifdef HAVE_X_WINDOWS
 112 #define BSTRING
 113 #endif /* HAVE_X_WINDOWS */
 114
 115 /* On USG systems signal handlers return void */
 116
 117 #define SIGTYPE void
 118
 119 #define ORDINARY_LINK
 120
 121 #define LIB_STANDARD
 122
 123 /* there are no -lg libraries on this system, and no libPW */
 124
 125 #define LIBS_DEBUG
 126
 127 /* Undump with ELF */
 128
 129 #undef COFF
 130
 131 #define UNEXEC unexelf.o
 132
 133 /* Get FIONREAD from <sys/filio.h>.  Get <sys/ttold.h> to get struct
 134  * tchars. But get <termio.h> first to make sure ttold.h doesn't
 135  * interfere.  And don't try to use SIGIO yet.
 136  */
 137
 138 #ifndef NOT_C_CODE
 139 #include <sys/wait.h>
 140 #endif
 141
 142 #ifdef emacs
 143 #include <sys/filio.h>
 144 #include <termio.h>
 145 #include <sys/ttold.h>
 146 #include <signal.h>
 147 #include <sys/stream.h>
 148 #include <sys/stropts.h>
 149 #include <sys/termios.h>
 150 #define BROKEN_SIGIO
 151 #endif
 152
 153 /* Some SVr4s don't define NSIG in sys/signal.h for ANSI environments;
 154  * instead, there's a system variable _sys_nsig.  Unfortunately, we need the
 155  * constant to dimension an array.  So wire in the appropriate value here.
 156  */
 157 #define NSIG_MINIMUM 32
 158
 159 /* We can support this */
 160
 161 #define CLASH_DETECTION
 162
 163 #define HAVE_PTYS
 164 #define HAVE_TERMIOS
 165
 166 /* It is possible to receive SIGCHLD when there are no children
 167    waiting, because a previous waitsys(2) cleaned up the carcass of child
 168    without clearing the SIGCHLD pending info.  So, use a non-blocking
 169    wait3 instead, which maps to waitpid(2) in SysVr4. */
 170
 171 #define wait3(status, options, rusage) \
 172   waitpid ((pid_t) -1, (status), (options))
 173 #define WRETCODE(w) (w >> 8)
 174
 175 /* TIOCGPGRP is broken in SysVr4, so we can't send signals to PTY
 176    subprocesses the usual way.  But TIOCSIGNAL does work for PTYs, and
 177    this is all we need.  */
 178
 179 #define TIOCSIGSEND TIOCSIGNAL
 180
 181 /* This change means that we don't loop through allocate_pty too many
 182    times in the (rare) event of a failure. */
 183
 184 #define FIRST_PTY_LETTER 'z'
 185
 186 /* This sets the name of the master side of the PTY. */
 187
 188 #define PTY_NAME_SPRINTF strcpy (pty_name, "/dev/ptmx");
 189
 190 /* This sets the name of the slave side of the PTY.  On SysVr4,
 191    grantpt(3) forks a subprocess, so keep sigchld_handler() from
 192    intercepting that death.  If any child but grantpt's should die
 193    within, it should be caught after sigrelse(2). */
 194
 195 #define PTY_TTY_NAME_SPRINTF                            \
 196   {                                                     \
 197     char *ptsname (), *ptyname;                         \
 198                                                         \
 199     sighold (SIGCLD);                                   \
 200     if (grantpt (fd) == -1)                             \
 201       { emacs_close (fd); return -1; }                  \
 202     sigrelse (SIGCLD);                                  \
 203     if (unlockpt (fd) == -1)                            \
 204       { emacs_close (fd); return -1; }                  \
 205     if (!(ptyname = ptsname (fd)))                      \
 206       { emacs_close (fd); return -1; }                  \
 207     strncpy (pty_name, ptyname, sizeof (pty_name));     \
 208     pty_name[sizeof (pty_name) - 1] = 0;                \
 209   }
 210
 211 /* Push various streams modules onto a PTY channel. */
 212
 213 #define SETUP_SLAVE_PTY \
 214   if (ioctl (xforkin, I_PUSH, "ptem") == -1)    \
 215     fatal ("ioctl I_PUSH ptem", errno);         \
 216   if (ioctl (xforkin, I_PUSH, "ldterm") == -1)  \
 217     fatal ("ioctl I_PUSH ldterm", errno);       \
 218   if (ioctl (xforkin, I_PUSH, "ttcompat") == -1) \
 219     fatal ("ioctl I_PUSH ttcompat", errno);
 220
 221 /* This definition was suggested for next release.
 222    So give it a try.  */
 223 #define HAVE_SOCKETS
 224
 225 /* arch-tag: 1a0ed909-5faa-434b-b7c3-9d86c63d53a6
 226    (do not change this comment) */