src/syssignal.h

   1 /* syssignal.h - System-dependent definitions for signals.
   2    Copyright (C) 1993, 1999 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 #ifdef POSIX_SIGNALS
  22
  23 /* Don't #include <signal.h>.  That header should always be #included
  24    before "config.h", because some configuration files (like s/hpux.h)
  25    indicate that SIGIO doesn't work by #undef-ing SIGIO.  If this file
  26    #includes <signal.h>, then that will re-#define SIGIO and confuse
  27    things.  */
  28
  29 #define SIGMASKTYPE sigset_t
  30
  31 #define SIGEMPTYMASK (empty_mask)
  32 #define SIGFULLMASK (full_mask)
  33 extern sigset_t empty_mask, full_mask;
  34 extern void init_signals P_ ((void));
  35
  36 /* POSIX pretty much destroys any possibility of writing sigmask as a
  37    macro in standard C.  We always define our own version because the
  38    predefined macro in Glibc 2.1 is only provided for compatility for old
  39    programs that use int as signal mask type.  */
  40 #undef sigmask
  41 #ifdef __GNUC__
  42 #define sigmask(SIG)                            \
  43   ({                                            \
  44     sigset_t _mask;                             \
  45     sigemptyset (&_mask);                       \
  46     sigaddset (&_mask, SIG);                    \
  47     _mask;                                      \
  48   })
  49 #else /* ! defined (__GNUC__) */
  50 extern sigset_t sys_sigmask ();
  51 #define sigmask(SIG) (sys_sigmask (SIG))
  52 #endif /* ! defined (__GNUC__) */
  53
  54 #undef sigpause
  55 #define sigpause(MASK)    sigsuspend (&(MASK))
  56
  57 #define sigblock(SIG)    sys_sigblock (SIG)
  58 #define sigunblock(SIG)  sys_sigunblock (SIG)
  59 #ifndef sigsetmask
  60 #define sigsetmask(SIG)  sys_sigsetmask (SIG)
  61 #endif
  62 #define sighold(SIG)     ONLY_USED_IN_BSD_4_1
  63 #define sigrelse(SIG)    ONLY_USED_IN_BSD_4_1
  64 #undef signal
  65 #define signal(SIG,ACT)      sys_signal(SIG,ACT)
  66
  67 /* Whether this is what all systems want or not, this is what
  68    appears to be assumed in the source, for example data.c:arith_error.  */
  69 typedef RETSIGTYPE (*signal_handler_t) (/*int*/);
  70
  71 signal_handler_t sys_signal P_ ((int signal_number, signal_handler_t action));
  72 sigset_t sys_sigblock   P_ ((sigset_t new_mask));
  73 sigset_t sys_sigunblock P_ ((sigset_t new_mask));
  74 sigset_t sys_sigsetmask P_ ((sigset_t new_mask));
  75
  76 #define sys_sigdel(MASK,SIG) sigdelset (&MASK,SIG)
  77
  78 #else /* ! defined (POSIX_SIGNALS) */
  79 #ifdef USG5_4
  80
  81 extern SIGMASKTYPE sigprocmask_set;
  82
  83 #ifndef sigblock
  84 #define sigblock(sig)                                   \
  85      (sigprocmask_set = SIGEMPTYMASK | (sig),           \
  86       sigprocmask (SIG_BLOCK, &sigprocmask_set, NULL))
  87 #endif
  88
  89 #ifndef sigunblock
  90 #define sigunblock(sig)                                         \
  91      (sigprocmask_set = SIGFULLMASK & ~(sig),                   \
  92       sigprocmask (SIG_SETMASK, &sigprocmask_set, NULL))
  93 #endif
  94
  95 #else
  96 #ifdef USG
  97
  98 #ifndef sigunblock
  99 #define sigunblock(sig)
 100 #endif
 101
 102 #else
 103
 104 #ifndef sigunblock
 105 #define sigunblock(SIG) \
 106 { SIGMASKTYPE omask = sigblock (SIGEMPTYMASK); sigsetmask (omask & ~SIG); }
 107 #endif
 108
 109 #endif /* ! defined (USG) */
 110 #endif /* ! defined (USG5_4) */
 111 #endif /* ! defined (POSIX_SIGNALS) */
 112
 113 #ifndef SIGMASKTYPE
 114 #define SIGMASKTYPE int
 115 #endif
 116
 117 #ifndef SIGEMPTYMASK
 118 #define SIGEMPTYMASK (0)
 119 #endif
 120
 121 #ifndef SIGFULLMASK
 122 #define SIGFULLMASK (0xffffffff)
 123 #endif
 124
 125 #ifndef sigmask
 126 #define sigmask(no) (1L << ((no) - 1))
 127 #endif
 128
 129 #ifndef sigunblock
 130 #define sigunblock(SIG) \
 131 { SIGMASKTYPE omask = sigblock (SIGFULLMASK); sigsetmask (omask & ~SIG); }
 132 #endif
 133
 134 #ifndef BSD4_1
 135 #define sigfree() sigsetmask (SIGEMPTYMASK)
 136 #endif /* not BSD4_1 */
 137
 138 #if defined (SIGINFO) && defined (BROKEN_SIGINFO)
 139 #undef SIGINFO
 140 #endif
 141 #if defined (SIGIO) && defined (BROKEN_SIGIO)
 142 #undef SIGIO
 143 #endif
 144 #if defined (SIGPOLL) && defined (BROKEN_SIGPOLL)
 145 #undef SIGPOLL
 146 #endif
 147 #if defined (SIGTSTP) && defined (BROKEN_SIGTSTP)
 148 #undef SIGTSTP
 149 #endif
 150 #if defined (SIGURG) && defined (BROKEN_SIGURG)
 151 #undef SIGURG
 152 #endif
 153 #if defined (SIGAIO) && defined (BROKEN_SIGAIO)
 154 #undef SIGAIO
 155 #endif
 156 #if defined (SIGPTY) && defined (BROKEN_SIGPTY)
 157 #undef SIGPTY
 158 #endif
 159
 160
 161 #if NSIG < NSIG_MINIMUM
 162 # ifdef NSIG
 163 #  undef NSIG
 164 # endif
 165 # define NSIG NSIG_MINIMUM
 166 #endif
 167
 168 #ifdef BSD4_1
 169 #define SIGIO SIGTINT
 170 /* sigfree is in sysdep.c */
 171 #endif /* BSD4_1 */
 172
 173 /* On bsd, [man says] kill does not accept a negative number to kill a pgrp.
 174    Must do that using the killpg call.  */
 175 #ifdef BSD_SYSTEM
 176 #define EMACS_KILLPG(gid, signo) (killpg ( (gid), (signo)))
 177 #else
 178 #ifdef WINDOWSNT
 179 #define EMACS_KILLPG(gid, signo) (kill (gid, signo))
 180 #else
 181 #define EMACS_KILLPG(gid, signo) (kill   (-(gid), (signo)))
 182 #endif
 183 #endif
 184
 185 /* Define SIGCHLD as an alias for SIGCLD.  There are many conditionals
 186    testing SIGCHLD.  */
 187 #ifndef VMS
 188 #ifdef SIGCLD
 189 #ifndef SIGCHLD
 190 #define SIGCHLD SIGCLD
 191 #endif /* SIGCHLD */
 192 #endif /* ! defined (SIGCLD) */
 193 #endif /* VMS */
 194
 195 #ifndef HAVE_STRSIGNAL
 196 /* strsignal is in sysdep.c */
 197 char *strsignal ();
 198 #endif