contrib/texinfo-4/info/signals.h

   1 /* signals.h -- header to include system dependent signal definitions.
   2    $Id: signals.h,v 1.2 2004/04/11 17:56:46 karl Exp $
   3
   4    Copyright (C) 1993, 1994, 1995, 1997, 2002, 2004 Free Software Foundation, Inc.
   5
   6    This program 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    This program 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 this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19
  20    Originally written by Brian Fox (bfox@ai.mit.edu). */
  21
  22 #ifndef INFO_SIGNALS_H
  23 #define INFO_SIGNALS_H
  24
  25 #include <sys/types.h>
  26 #include <signal.h>
  27
  28 /* For sysV68 --phdm@info.ucl.ac.be.  */
  29 #if !defined (SIGCHLD) && defined (SIGCLD)
  30 #define SIGCHLD SIGCLD
  31 #endif
  32
  33 #if !defined (HAVE_SIGPROCMASK) && !defined (sigmask)
  34 #  define sigmask(x) (1 << ((x)-1))
  35 #endif /* !HAVE_SIGPROCMASK && !sigmask */
  36
  37 /* Without SA_NOCLDSTOP, sigset_t might end up being undefined even
  38    though we have sigprocmask, on older systems, according to Nelson
  39    Beebe.  The test is from coreutils/sort.c, via Paul Eggert.  */
  40 #if !defined (HAVE_SIGPROCMASK) || !defined (SA_NOCLDSTOP)
  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 */