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 #define sigunblock(sig)                                         \
  90      (sigprocmask_set = SIGFULLMASK & ~(sig),                   \
  91       sigprocmask (SIG_SETMASK, &sigprocmask_set, NULL))
  92
  93 #else
  94 #ifdef USG
  95
  96 #define sigunblock(sig)
  97
  98 #else
  99
 100 #define sigunblock(SIG) \
 101 { SIGMASKTYPE omask = sigblock (SIGEMPTYMASK); sigsetmask (omask & ~SIG); }
 102
 103 #endif /* ! defined (USG) */
 104 #endif /* ! defined (USG5_4) */
 105 #endif /* ! defined (POSIX_SIGNALS) */
 106
 107 #ifndef SIGMASKTYPE
 108 #define SIGMASKTYPE int
 109 #endif
 110
 111 #ifndef SIGEMPTYMASK
 112 #define SIGEMPTYMASK (0)
 113 #endif
 114
 115 #ifndef SIGFULLMASK
 116 #define SIGFULLMASK (0xffffffff)
 117 #endif
 118
 119 #ifndef sigmask
 120 #define sigmask(no) (1L << ((no) - 1))
 121 #endif
 122
 123 #ifndef sigunblock
 124 #define sigunblock(SIG) \
 125 { SIGMASKTYPE omask = sigblock (SIGFULLMASK); sigsetmask (omask & ~SIG); }
 126 #endif
 127
 128 #ifndef BSD4_1
 129 #define sigfree() sigsetmask (SIGEMPTYMASK)
 130 #endif /* not BSD4_1 */
 131
 132 #if defined (SIGINFO) && defined (BROKEN_SIGINFO)
 133 #undef SIGINFO
 134 #endif
 135 #if defined (SIGIO) && defined (BROKEN_SIGIO)
 136 #undef SIGIO
 137 #endif
 138 #if defined (SIGPOLL) && defined (BROKEN_SIGPOLL)
 139 #undef SIGPOLL
 140 #endif
 141 #if defined (SIGTSTP) && defined (BROKEN_SIGTSTP)
 142 #undef SIGTSTP
 143 #endif
 144 #if defined (SIGURG) && defined (BROKEN_SIGURG)
 145 #undef SIGURG
 146 #endif
 147
 148 #if NSIG < NSIG_MINIMUM
 149 # ifdef NSIG
 150 #  undef NSIG
 151 # endif
 152 # define NSIG NSIG_MINIMUM
 153 #endif
 154
 155 #ifdef BSD4_1
 156 #define SIGIO SIGTINT
 157 /* sigfree is in sysdep.c */
 158 #endif /* BSD4_1 */
 159
 160 /* On bsd, [man says] kill does not accept a negative number to kill a pgrp.
 161    Must do that using the killpg call.  */
 162 #ifdef BSD_SYSTEM
 163 #define EMACS_KILLPG(gid, signo) (killpg ( (gid), (signo)))
 164 #else
 165 #ifdef WINDOWSNT
 166 #define EMACS_KILLPG(gid, signo) (kill (gid, signo))
 167 #else
 168 #define EMACS_KILLPG(gid, signo) (kill   (-(gid), (signo)))
 169 #endif
 170 #endif
 171
 172 /* Define SIGCHLD as an alias for SIGCLD.  There are many conditionals
 173    testing SIGCHLD.  */
 174 #ifndef VMS
 175 #ifdef SIGCLD
 176 #ifndef SIGCHLD
 177 #define SIGCHLD SIGCLD
 178 #endif /* SIGCHLD */
 179 #endif /* ! defined (SIGCLD) */
 180 #endif /* VMS */
 181
 182 #ifndef HAVE_STRSIGNAL
 183 /* strsignal is in sysdep.c */
 184 char *strsignal ();
 185 #endif