gnu/dist/texinfo/info/signals.h

   1 /*      $NetBSD$        */
   2
   3 /* signals.h -- header to include system dependent signal definitions.
   4    Id: signals.h,v 1.2 2004/04/11 17:56:46 karl Exp
   5
   6    Copyright (C) 1993, 1994, 1995, 1997, 2002, 2004 Free Software Foundation, Inc.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2, or (at your option)
  11    any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  21
  22    Originally written by Brian Fox (bfox@ai.mit.edu). */
  23
  24 #ifndef INFO_SIGNALS_H
  25 #define INFO_SIGNALS_H
  26
  27 #include <sys/types.h>
  28 #include <signal.h>
  29
  30 /* For sysV68 --phdm@info.ucl.ac.be.  */
  31 #if !defined (SIGCHLD) && defined (SIGCLD)
  32 #define SIGCHLD SIGCLD
  33 #endif
  34
  35 #if !defined (HAVE_SIGPROCMASK) && !defined (sigmask)
  36 #  define sigmask(x) (1 << ((x)-1))
  37 #endif /* !HAVE_SIGPROCMASK && !sigmask */
  38
  39 /* Without SA_NOCLDSTOP, sigset_t might end up being undefined even
  40    though we have sigprocmask, on older systems, according to Nelson
  41    Beebe.  The test is from coreutils/sort.c, via Paul Eggert.  */
  42 #if !defined (HAVE_SIGPROCMASK) || !defined (SA_NOCLDSTOP)
  43 #  if !defined (SIG_BLOCK)
  44 #    define SIG_UNBLOCK 1
  45 #    define SIG_BLOCK   2
  46 #    define SIG_SETMASK 3
  47 #  endif /* SIG_BLOCK */
  48
  49 /* Type of a signal set. */
  50 #  define sigset_t int
  51
  52 /* Make SET have no signals in it. */
  53 #  define sigemptyset(set) (*(set) = (sigset_t)0x0)
  54
  55 /* Make SET have the full range of signal specifications possible. */
  56 #  define sigfillset(set) (*(set) = (sigset_t)0xffffffffff)
  57
  58 /* Add SIG to the contents of SET. */
  59 #  define sigaddset(set, sig) *(set) |= sigmask (sig)
  60
  61 /* Delete SIG from the contents of SET. */
  62 #  define sigdelset(set, sig) *(set) &= ~(sigmask (sig))
  63
  64 /* Tell if SET contains SIG. */
  65 #  define sigismember(set, sig) (*(set) & (sigmask (sig)))
  66
  67 /* Suspend the process until the reception of one of the signals
  68    not present in SET. */
  69 #  define sigsuspend(set) sigpause (*(set))
  70 #endif /* !HAVE_SIGPROCMASK */
  71
  72 #if defined (HAVE_SIGPROCMASK) || defined (HAVE_SIGSETMASK)
  73 /* These definitions are used both in POSIX and non-POSIX implementations. */
  74
  75 #define BLOCK_SIGNAL(sig) \
  76   do { \
  77     sigset_t nvar, ovar; \
  78     sigemptyset (&nvar); \
  79     sigemptyset (&ovar); \
  80     sigaddset (&nvar, sig); \
  81     sigprocmask (SIG_BLOCK, &nvar, &ovar); \
  82   } while (0)
  83
  84 #define UNBLOCK_SIGNAL(sig) \
  85   do { \
  86     sigset_t nvar, ovar; \
  87     sigemptyset (&ovar); \
  88     sigemptyset (&nvar); \
  89     sigaddset (&nvar, sig); \
  90     sigprocmask (SIG_UNBLOCK, &nvar, &ovar); \
  91   } while (0)
  92
  93 #else /* !HAVE_SIGPROCMASK && !HAVE_SIGSETMASK */
  94 #  define BLOCK_SIGNAL(sig)
  95 #  define UNBLOCK_SIGNAL(sig)
  96 #endif /* !HAVE_SIGPROCMASK && !HAVE_SIGSETMASK */
  97
  98 #endif /* not INFO_SIGNALS_H */