texinfo/info/signals.h

   1 /* signals.h -- Header to include system dependent signal definitions.
   2    $Id: signals.h,v 1.1.1.2 1998/03/22 20:42:55 law Exp $
   3
   4    This file is part of GNU Info, a program for reading online documentation
   5    stored in Info format.
   6
   7    Copyright (C) 1993, 94, 95, 97 Free Software Foundation, Inc.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2, or (at your option)
  12    any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  22
  23    Written by Brian Fox (bfox@ai.mit.edu). */
  24
  25 #ifndef INFO_SIGNALS_H
  26 #define INFO_SIGNALS_H
  27
  28 #include <sys/types.h>
  29 #include <signal.h>
  30
  31 /* For sysV68 --phdm@info.ucl.ac.be.  */
  32 #if !defined (SIGCHLD) && defined (SIGCLD)
  33 #define SIGCHLD SIGCLD
  34 #endif
  35
  36 #if !defined (HAVE_SIGPROCMASK) && !defined (sigmask)
  37 #  define sigmask(x) (1 << ((x)-1))
  38 #endif /* !HAVE_SIGPROCMASK && !sigmask */
  39
  40 #if !defined (HAVE_SIGPROCMASK)
  41 #  if !defined (SIG_BLOCK)
  42 #    define SIG_UNBLOCK 1
  43 #    define SIG_BLOCK   2
  44 #    define SIG_SETMASK 3
  45 #  endif /* SIG_BLOCK */
  46
  47 /* Type of a signal set. */
  48 #  define sigset_t int
  49
  50 /* Make SET have no signals in it. */
  51 #  define sigemptyset(set) (*(set) = (sigset_t)0x0)
  52
  53 /* Make SET have the full range of signal specifications possible. */
  54 #  define sigfillset(set) (*(set) = (sigset_t)0xffffffffff)
  55
  56 /* Add SIG to the contents of SET. */
  57 #  define sigaddset(set, sig) *(set) |= sigmask (sig)
  58
  59 /* Delete SIG from the contents of SET. */
  60 #  define sigdelset(set, sig) *(set) &= ~(sigmask (sig))
  61
  62 /* Tell if SET contains SIG. */
  63 #  define sigismember(set, sig) (*(set) & (sigmask (sig)))
  64
  65 /* Suspend the process until the reception of one of the signals
  66    not present in SET. */
  67 #  define sigsuspend(set) sigpause (*(set))
  68 #endif /* !HAVE_SIGPROCMASK */
  69
  70 #if defined (HAVE_SIGPROCMASK) || defined (HAVE_SIGSETMASK)
  71 /* These definitions are used both in POSIX and non-POSIX implementations. */
  72
  73 #define BLOCK_SIGNAL(sig) \
  74   do { \
  75     sigset_t nvar, ovar; \
  76     sigemptyset (&nvar); \
  77     sigemptyset (&ovar); \
  78     sigaddset (&nvar, sig); \
  79     sigprocmask (SIG_BLOCK, &nvar, &ovar); \
  80   } while (0)
  81
  82 #define UNBLOCK_SIGNAL(sig) \
  83   do { \
  84     sigset_t nvar, ovar; \
  85     sigemptyset (&ovar); \
  86     sigemptyset (&nvar); \
  87     sigaddset (&nvar, sig); \
  88     sigprocmask (SIG_UNBLOCK, &nvar, &ovar); \
  89   } while (0)
  90
  91 #else /* !HAVE_SIGPROCMASK && !HAVE_SIGSETMASK */
  92 #  define BLOCK_SIGNAL(sig)
  93 #  define UNBLOCK_SIGNAL(sig)
  94 #endif /* !HAVE_SIGPROCMASK && !HAVE_SIGSETMASK */
  95
  96 #endif /* not INFO_SIGNALS_H */