code.delx.au - gnu-emacs/blob - 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, 2009, 2010, 2011  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 /* The file containing the kernel's symbol table is called /unix.  */
  56
  57 #define KERNEL_FILE "/unix"
  58
  59 /* The symbol in the kernel where the load average is found
  60    is named avenrun.  */
  61
  62 #define LDAV_SYMBOL "avenrun"
  63
  64 /* Special hacks needed to make Emacs run on this system.  */
  65
  66 /*
  67  *      Make the sigsetmask function go away.  Don't know what the
  68  *      ramifications of this are, but doesn't seem possible to
  69  *      emulate it properly anyway at this point.
  70  */
  71
  72 #define sigsetmask(mask)        /* Null expansion */
  73
  74 /* setjmp and longjmp can safely replace _setjmp and _longjmp,
  75    but they will run slower.  */
  76
  77 #define _setjmp setjmp
  78 #define _longjmp longjmp
  79
  80 /* On USG systems these have different names */
  81 #ifndef HAVE_INDEX
  82 #define index strchr
  83 #endif /* ! defined (HAVE_INDEX) */
  84 #ifndef HAVE_RINDEX
  85 #define rindex strrchr
  86 #endif /* ! defined (HAVE_RINDEX) */
  87
  88 /* Use terminfo instead of termcap.  */
  89
  90 #define TERMINFO
  91
  92
  93 /* The docs for system V/386 suggest v.3 has sigpause,
  94    so let's give it a try.  */
  95 #define HAVE_SYSV_SIGPAUSE
  96
  97
  98 /* If we're using the System V X port, BSD bstring functions will be handy */
  99
 100 #ifdef HAVE_X_WINDOWS
 101 #define BSTRING
 102 #endif /* HAVE_X_WINDOWS */
 103
 104 /* On USG systems signal handlers return void */
 105
 106 #define SIGTYPE void
 107
 108 #define ORDINARY_LINK
 109
 110 #define LIB_STANDARD
 111
 112 /* there are no -lg libraries on this system, and no libPW */
 113
 114 #define LIBS_DEBUG
 115
 116 /* Undump with ELF */
 117
 118 #undef COFF
 119
 120 #define UNEXEC unexelf.o
 121
 122 /* Get FIONREAD from <sys/filio.h>.  Get <sys/ttold.h> to get struct
 123  * tchars. But get <termio.h> first to make sure ttold.h doesn't
 124  * interfere.  And don't try to use SIGIO yet.
 125  */
 126
 127 #ifndef NOT_C_CODE
 128 #include <sys/wait.h>
 129 #endif
 130
 131 #ifdef emacs
 132 #include <sys/filio.h>
 133 #include <termio.h>
 134 #include <sys/ttold.h>
 135 #include <signal.h>
 136 #include <sys/stream.h>
 137 #include <sys/stropts.h>
 138 #include <sys/termios.h>
 139 #define BROKEN_SIGIO
 140 #endif
 141
 142 /* Some SVr4s don't define NSIG in sys/signal.h for ANSI environments;
 143  * instead, there's a system variable _sys_nsig.  Unfortunately, we need the
 144  * constant to dimension an array.  So wire in the appropriate value here.
 145  */
 146 #define NSIG_MINIMUM 32
 147
 148 /* We can support this */
 149
 150 #define CLASH_DETECTION
 151
 152 #define HAVE_PTYS
 153 #define HAVE_TERMIOS
 154
 155 /* It is possible to receive SIGCHLD when there are no children
 156    waiting, because a previous waitsys(2) cleaned up the carcass of child
 157    without clearing the SIGCHLD pending info.  So, use a non-blocking
 158    wait3 instead, which maps to waitpid(2) in SysVr4. */
 159
 160 #define wait3(status, options, rusage) \
 161   waitpid ((pid_t) -1, (status), (options))
 162 #define WRETCODE(w) (w >> 8)
 163
 164 /* TIOCGPGRP is broken in SysVr4, so we can't send signals to PTY
 165    subprocesses the usual way.  But TIOCSIGNAL does work for PTYs, and
 166    this is all we need.  */
 167
 168 #define TIOCSIGSEND TIOCSIGNAL
 169
 170 /* This change means that we don't loop through allocate_pty too many
 171    times in the (rare) event of a failure. */
 172
 173 #define FIRST_PTY_LETTER 'z'
 174
 175 /* This sets the name of the master side of the PTY. */
 176
 177 #define PTY_NAME_SPRINTF strcpy (pty_name, "/dev/ptmx");
 178
 179 /* This sets the name of the slave side of the PTY.  On SysVr4,
 180    grantpt(3) forks a subprocess, so keep sigchld_handler() from
 181    intercepting that death.  If any child but grantpt's should die
 182    within, it should be caught after sigrelse(2). */
 183
 184 #define PTY_TTY_NAME_SPRINTF                            \
 185   {                                                     \
 186     char *ptsname (), *ptyname;                         \
 187                                                         \
 188     sighold (SIGCLD);                                   \
 189     if (grantpt (fd) == -1)                             \
 190       { emacs_close (fd); return -1; }                  \
 191     sigrelse (SIGCLD);                                  \
 192     if (unlockpt (fd) == -1)                            \
 193       { emacs_close (fd); return -1; }                  \
 194     if (!(ptyname = ptsname (fd)))                      \
 195       { emacs_close (fd); return -1; }                  \
 196     strncpy (pty_name, ptyname, sizeof (pty_name));     \
 197     pty_name[sizeof (pty_name) - 1] = 0;                \
 198   }
 199
 200 /* Push various streams modules onto a PTY channel. */
 201
 202 #define SETUP_SLAVE_PTY \
 203   if (ioctl (xforkin, I_PUSH, "ptem") == -1)    \
 204     fatal ("ioctl I_PUSH ptem", errno);         \
 205   if (ioctl (xforkin, I_PUSH, "ldterm") == -1)  \
 206     fatal ("ioctl I_PUSH ldterm", errno);       \
 207   if (ioctl (xforkin, I_PUSH, "ttcompat") == -1) \
 208     fatal ("ioctl I_PUSH ttcompat", errno);
 209
 210 /* This definition was suggested for next release.
 211    So give it a try.  */
 212 #define HAVE_SOCKETS
 213
 214 /* arch-tag: 1a0ed909-5faa-434b-b7c3-9d86c63d53a6
 215    (do not change this comment) */