90 lines
2.8 KiB
C
90 lines
2.8 KiB
C
/* signals.h -- Header to include system dependent signal definitions. */
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/* This file is part of GNU Info, a program for reading online documentation
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stored in Info format.
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Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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Written by Brian Fox (bfox@ai.mit.edu). */
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#if !defined (_SIGNALS_H_)
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#define _SIGNALS_H_
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#include <signal.h>
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#if !defined (HAVE_SIGPROCMASK) && !defined (sigmask)
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# define sigmask(x) (1 << ((x)-1))
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#endif /* !HAVE_SIGPROCMASK && !sigmask */
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#if !defined (HAVE_SIGPROCMASK)
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# if !defined (SIG_BLOCK)
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# define SIG_UNBLOCK 1
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# define SIG_BLOCK 2
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# define SIG_SETMASK 3
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# endif /* SIG_BLOCK */
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/* Type of a signal set. */
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# define sigset_t int
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/* Make SET have no signals in it. */
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# define sigemptyset(set) (*(set) = (sigset_t)0x0)
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/* Make SET have the full range of signal specifications possible. */
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# define sigfillset(set) (*(set) = (sigset_t)0xffffffffff)
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/* Add SIG to the contents of SET. */
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# define sigaddset(set, sig) *(set) |= sigmask (sig)
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/* Delete SIG from the contents of SET. */
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# define sigdelset(set, sig) *(set) &= ~(sigmask (sig))
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/* Tell if SET contains SIG. */
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# define sigismember(set, sig) (*(set) & (sigmask (sig)))
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/* Suspend the process until the reception of one of the signals
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not present in SET. */
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# define sigsuspend(set) sigpause (*(set))
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#endif /* !HAVE_SIGPROCMASK */
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#if defined (HAVE_SIGPROCMASK) || defined (HAVE_SIGSETMASK)
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/* These definitions are used both in POSIX and non-POSIX implementations. */
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#define BLOCK_SIGNAL(sig) \
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do { \
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sigset_t nvar, ovar; \
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sigemptyset (&nvar); \
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sigemptyset (&ovar); \
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sigaddset (&nvar, sig); \
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sigprocmask (SIG_BLOCK, &nvar, &ovar); \
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} while (0)
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#define UNBLOCK_SIGNAL(sig) \
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do { \
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sigset_t nvar, ovar; \
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sigemptyset (&ovar); \
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sigemptyset (&nvar); \
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sigaddset (&nvar, sig); \
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sigprocmask (SIG_UNBLOCK, &nvar, &ovar); \
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} while (0)
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#else /* !HAVE_SIGPROCMASK && !HAVE_SIGSETMASK */
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# define BLOCK_SIGNAL(sig)
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# define UNBLOCK_SIGNAL(sig)
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#endif /* !HAVE_SIGPROCMASK && !HAVE_SIGSETMASK */
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#endif /* !_SIGNALS_H_ */
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