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 /* XXX This is not correct anymore, there is a BROKEN_SIGIO macro. */
  31
  32 #define SIGMASKTYPE sigset_t
  33
  34 #define SIGEMPTYMASK (empty_mask)
  35 #define SIGFULLMASK (full_mask)
  36 extern sigset_t empty_mask, full_mask;
  37
  38 /* POSIX pretty much destroys any possibility of writing sigmask as a
  39    macro in standard C.  We always define our own version because the
  40    predefined macro in Glibc 2.1 is only provided for compatility for old
  41    programs that use int as signal mask type.  */
  42 #undef sigmask
  43 #ifdef __GNUC__
  44 #define sigmask(SIG)                            \
  45   ({                                            \
  46     sigset_t _mask;                             \
  47     sigemptyset (&_mask);                       \
  48     sigaddset (&_mask, SIG);                    \
  49     _mask;                                      \
  50   })
  51 #else /* ! defined (__GNUC__) */
  52 extern sigset_t sys_sigmask ();
  53 #define sigmask(SIG) (sys_sigmask (SIG))
  54 #endif /* ! defined (__GNUC__) */
  55
  56 #undef sigpause
  57 #define sigpause(MASK)    sigsuspend (&(MASK))
  58
  59 #define sigblock(SIG)    sys_sigblock (SIG)
  60 #define sigunblock(SIG)  sys_sigunblock (SIG)
  61 #ifndef sigsetmask
  62 #define sigsetmask(SIG)  sys_sigsetmask (SIG)
  63 #endif
  64 #define sighold(SIG)     ONLY_USED_IN_BSD_4_1
  65 #define sigrelse(SIG)    ONLY_USED_IN_BSD_4_1
  66 #undef signal
  67 #define signal(SIG,ACT)      sys_signal(SIG,ACT)
  68
  69 /* Whether this is what all systems want or not, this is what
  70    appears to be assumed in the source, for example data.c:arith_error.  */
  71 typedef RETSIGTYPE (*signal_handler_t) (/*int*/);
  72
  73 signal_handler_t sys_signal P_ ((int signal_number, signal_handler_t action));
  74 sigset_t sys_sigblock   P_ ((sigset_t new_mask));
  75 sigset_t sys_sigunblock P_ ((sigset_t new_mask));
  76 sigset_t sys_sigsetmask P_ ((sigset_t new_mask));
  77
  78 #define sys_sigdel(MASK,SIG) sigdelset (&MASK,SIG)
  79
  80 #else /* ! defined (POSIX_SIGNALS) */
  81 #ifdef USG5_4
  82
  83 extern SIGMASKTYPE sigprocmask_set;
  84
  85 #ifndef sigblock
  86 #define sigblock(sig)                                   \
  87      (sigprocmask_set = SIGEMPTYMASK | (sig),           \
  88       sigprocmask (SIG_BLOCK, &sigprocmask_set, NULL))
  89 #endif
  90
  91 #ifndef sigunblock
  92 #define sigunblock(sig)                                         \
  93      (sigprocmask_set = SIGFULLMASK & ~(sig),                   \
  94       sigprocmask (SIG_SETMASK, &sigprocmask_set, NULL))
  95 #endif
  96
  97 #else
  98 #ifdef USG
  99
 100 #ifndef sigunblock
 101 #define sigunblock(sig)
 102 #endif
 103
 104 #else
 105
 106 #ifndef sigunblock
 107 #define sigunblock(SIG) \
 108 { SIGMASKTYPE omask = sigblock (SIGEMPTYMASK); sigsetmask (omask & ~SIG); }
 109 #endif
 110
 111 #endif /* ! defined (USG) */
 112 #endif /* ! defined (USG5_4) */
 113 #endif /* ! defined (POSIX_SIGNALS) */
 114
 115 #ifndef SIGMASKTYPE
 116 #define SIGMASKTYPE int
 117 #endif
 118
 119 #ifndef SIGEMPTYMASK
 120 #define SIGEMPTYMASK (0)
 121 #endif
 122
 123 #ifndef SIGFULLMASK
 124 #define SIGFULLMASK (0xffffffff)
 125 #endif
 126
 127 #ifndef sigmask
 128 #define sigmask(no) (1L << ((no) - 1))
 129 #endif
 130
 131 #ifndef sigunblock
 132 #define sigunblock(SIG) \
 133 { SIGMASKTYPE omask = sigblock (SIGFULLMASK); sigsetmask (omask & ~SIG); }
 134 #endif
 135
 136 #ifndef BSD4_1
 137 #define sigfree() sigsetmask (SIGEMPTYMASK)
 138 #endif /* not BSD4_1 */
 139
 140 #if defined (SIGINFO) && defined (BROKEN_SIGINFO)
 141 #undef SIGINFO
 142 #endif
 143 #if defined (SIGIO) && defined (BROKEN_SIGIO)
 144 #undef SIGIO
 145 #endif
 146 #if defined (SIGPOLL) && defined (BROKEN_SIGPOLL)
 147 #undef SIGPOLL
 148 #endif
 149 #if defined (SIGTSTP) && defined (BROKEN_SIGTSTP)
 150 #undef SIGTSTP
 151 #endif
 152 #if defined (SIGURG) && defined (BROKEN_SIGURG)
 153 #undef SIGURG
 154 #endif
 155 #if defined (SIGAIO) && defined (BROKEN_SIGAIO)
 156 #undef SIGAIO
 157 #endif
 158 #if defined (SIGPTY) && defined (BROKEN_SIGPTY)
 159 #undef SIGPTY
 160 #endif
 161
 162
 163 #if NSIG < NSIG_MINIMUM
 164 # ifdef NSIG
 165 #  undef NSIG
 166 # endif
 167 # define NSIG NSIG_MINIMUM
 168 #endif
 169
 170 #ifdef BSD4_1
 171 #define SIGIO SIGTINT
 172 /* sigfree is in sysdep.c */
 173 #endif /* BSD4_1 */
 174
 175 /* On bsd, [man says] kill does not accept a negative number to kill a pgrp.
 176    Must do that using the killpg call.  */
 177 #ifdef BSD_SYSTEM
 178 #define EMACS_KILLPG(gid, signo) (killpg ( (gid), (signo)))
 179 #else
 180 #ifdef WINDOWSNT
 181 #define EMACS_KILLPG(gid, signo) (kill (gid, signo))
 182 #else
 183 #define EMACS_KILLPG(gid, signo) (kill   (-(gid), (signo)))
 184 #endif
 185 #endif
 186
 187 /* Define SIGCHLD as an alias for SIGCLD.  There are many conditionals
 188    testing SIGCHLD.  */
 189 #ifndef VMS
 190 #ifdef SIGCLD
 191 #ifndef SIGCHLD
 192 #define SIGCHLD SIGCLD
 193 #endif /* SIGCHLD */
 194 #endif /* ! defined (SIGCLD) */
 195 #endif /* VMS */
 196
 197 #ifndef HAVE_STRSIGNAL
 198 /* strsignal is in sysdep.c */
 199 char *strsignal ();
 200 #endif
 201
 202 /* arch-tag: 4580e86a-340d-4574-9e11-a742b6e1a152
 203    (do not change this comment) */