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 extern void init_signals P_ ((void));
  22
  23 #ifdef POSIX_SIGNALS
  24
  25 /* Don't #include <signal.h>.  That header should always be #included
  26    before "config.h", because some configuration files (like s/hpux.h)
  27    indicate that SIGIO doesn't work by #undef-ing SIGIO.  If this file
  28    #includes <signal.h>, then that will re-#define SIGIO and confuse
  29    things.  */
  30
  31 #define SIGMASKTYPE sigset_t
  32
  33 #define SIGEMPTYMASK (empty_mask)
  34 #define SIGFULLMASK (full_mask)
  35 extern sigset_t empty_mask, full_mask;
  36
  37 /* POSIX pretty much destroys any possibility of writing sigmask as a
  38    macro in standard C.  We always define our own version because the
  39    predefined macro in Glibc 2.1 is only provided for compatility for old
  40    programs that use int as signal mask type.  */
  41 #undef sigmask
  42 #ifdef __GNUC__
  43 #define sigmask(SIG)                            \
  44   ({                                            \
  45     sigset_t _mask;                             \
  46     sigemptyset (&_mask);                       \
  47     sigaddset (&_mask, SIG);                    \
  48     _mask;                                      \
  49   })
  50 #else /* ! defined (__GNUC__) */
  51 extern sigset_t sys_sigmask ();
  52 #define sigmask(SIG) (sys_sigmask (SIG))
  53 #endif /* ! defined (__GNUC__) */
  54
  55 #undef sigpause
  56 #define sigpause(MASK)    sigsuspend (&(MASK))
  57
  58 #define sigblock(SIG)    sys_sigblock (SIG)
  59 #define sigunblock(SIG)  sys_sigunblock (SIG)
  60 #ifndef sigsetmask
  61 #define sigsetmask(SIG)  sys_sigsetmask (SIG)
  62 #endif
  63 #define sighold(SIG)     ONLY_USED_IN_BSD_4_1
  64 #define sigrelse(SIG)    ONLY_USED_IN_BSD_4_1
  65 #undef signal
  66 #define signal(SIG,ACT)      sys_signal(SIG,ACT)
  67
  68 /* Whether this is what all systems want or not, this is what
  69    appears to be assumed in the source, for example data.c:arith_error.  */
  70 typedef RETSIGTYPE (*signal_handler_t) (/*int*/);
  71
  72 signal_handler_t sys_signal P_ ((int signal_number, signal_handler_t action));
  73 sigset_t sys_sigblock   P_ ((sigset_t new_mask));
  74 sigset_t sys_sigunblock P_ ((sigset_t new_mask));
  75 sigset_t sys_sigsetmask P_ ((sigset_t new_mask));
  76
  77 #define sys_sigdel(MASK,SIG) sigdelset (&MASK,SIG)
  78
  79 #else /* ! defined (POSIX_SIGNALS) */
  80 #ifdef USG5_4
  81
  82 extern SIGMASKTYPE sigprocmask_set;
  83
  84 #ifndef sigblock
  85 #define sigblock(sig)                                   \
  86      (sigprocmask_set = SIGEMPTYMASK | (sig),           \
  87       sigprocmask (SIG_BLOCK, &sigprocmask_set, NULL))
  88 #endif
  89
  90 #ifndef sigunblock
  91 #define sigunblock(sig)                                         \
  92      (sigprocmask_set = SIGFULLMASK & ~(sig),                   \
  93       sigprocmask (SIG_SETMASK, &sigprocmask_set, NULL))
  94 #endif
  95
  96 #else
  97 #ifdef USG
  98
  99 #ifndef sigunblock
 100 #define sigunblock(sig)
 101 #endif
 102
 103 #else
 104
 105 #ifndef sigunblock
 106 #define sigunblock(SIG) \
 107 { SIGMASKTYPE omask = sigblock (SIGEMPTYMASK); sigsetmask (omask & ~SIG); }
 108 #endif
 109
 110 #endif /* ! defined (USG) */
 111 #endif /* ! defined (USG5_4) */
 112 #endif /* ! defined (POSIX_SIGNALS) */
 113
 114 #ifndef SIGMASKTYPE
 115 #define SIGMASKTYPE int
 116 #endif
 117
 118 #ifndef SIGEMPTYMASK
 119 #define SIGEMPTYMASK (0)
 120 #endif
 121
 122 #ifndef SIGFULLMASK
 123 #define SIGFULLMASK (0xffffffff)
 124 #endif
 125
 126 #ifndef sigmask
 127 #define sigmask(no) (1L << ((no) - 1))
 128 #endif
 129
 130 #ifndef sigunblock
 131 #define sigunblock(SIG) \
 132 { SIGMASKTYPE omask = sigblock (SIGFULLMASK); sigsetmask (omask & ~SIG); }
 133 #endif
 134
 135 #ifndef BSD4_1
 136 #define sigfree() sigsetmask (SIGEMPTYMASK)
 137 #endif /* not BSD4_1 */
 138
 139 #if defined (SIGINFO) && defined (BROKEN_SIGINFO)
 140 #undef SIGINFO
 141 #endif
 142 #if defined (SIGIO) && defined (BROKEN_SIGIO)
 143 #undef SIGIO
 144 #endif
 145 #if defined (SIGPOLL) && defined (BROKEN_SIGPOLL)
 146 #undef SIGPOLL
 147 #endif
 148 #if defined (SIGTSTP) && defined (BROKEN_SIGTSTP)
 149 #undef SIGTSTP
 150 #endif
 151 #if defined (SIGURG) && defined (BROKEN_SIGURG)
 152 #undef SIGURG
 153 #endif
 154 #if defined (SIGAIO) && defined (BROKEN_SIGAIO)
 155 #undef SIGAIO
 156 #endif
 157 #if defined (SIGPTY) && defined (BROKEN_SIGPTY)
 158 #undef SIGPTY
 159 #endif
 160
 161
 162 #if NSIG < NSIG_MINIMUM
 163 # ifdef NSIG
 164 #  undef NSIG
 165 # endif
 166 # define NSIG NSIG_MINIMUM
 167 #endif
 168
 169 #ifdef BSD4_1
 170 #define SIGIO SIGTINT
 171 /* sigfree is in sysdep.c */
 172 #endif /* BSD4_1 */
 173
 174 /* On bsd, [man says] kill does not accept a negative number to kill a pgrp.
 175    Must do that using the killpg call.  */
 176 #ifdef BSD_SYSTEM
 177 #define EMACS_KILLPG(gid, signo) (killpg ( (gid), (signo)))
 178 #else
 179 #ifdef WINDOWSNT
 180 #define EMACS_KILLPG(gid, signo) (kill (gid, signo))
 181 #else
 182 #define EMACS_KILLPG(gid, signo) (kill   (-(gid), (signo)))
 183 #endif
 184 #endif
 185
 186 /* Define SIGCHLD as an alias for SIGCLD.  There are many conditionals
 187    testing SIGCHLD.  */
 188 #ifndef VMS
 189 #ifdef SIGCLD
 190 #ifndef SIGCHLD
 191 #define SIGCHLD SIGCLD
 192 #endif /* SIGCHLD */
 193 #endif /* ! defined (SIGCLD) */
 194 #endif /* VMS */
 195
 196 #ifndef HAVE_STRSIGNAL
 197 /* strsignal is in sysdep.c */
 198 char *strsignal ();
 199 #endif