118 lines
3.6 KiB
C
118 lines
3.6 KiB
C
/* $NetBSD: raise_default_signal.c,v 1.3 2008/04/28 20:23:03 martin Exp $ */
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/*-
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* Copyright (c) 2007 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Luke Mewburn.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#if HAVE_NBTOOL_CONFIG_H
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#include "nbtool_config.h"
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#endif
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: raise_default_signal.c,v 1.3 2008/04/28 20:23:03 martin Exp $");
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#endif
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#include <errno.h>
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#include <signal.h>
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#include <stdio.h>
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#include <string.h>
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#include <util.h>
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#if ! HAVE_RAISE_DEFAULT_SIGNAL
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/*
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* raise_default_signal sig
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* Raise the default signal handler for sig, by
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* - block all signals
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* - set the signal handler to SIG_DFL
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* - raise the signal
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* - unblock the signal to deliver it
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*
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* The original signal mask and signal handler is restored on exit
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* (whether successful or not).
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*
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* Returns 0 on success, or -1 on failure with errno set to
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* on of the values for sigemptyset(), sigaddset(), sigprocmask(),
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* sigaction(), or raise().
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*/
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int
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raise_default_signal(int sig)
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{
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struct sigaction origact, act;
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sigset_t origmask, fullmask, mask;
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int retval, oerrno;
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retval = -1;
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/* Setup data structures */
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/* XXX memset(3) isn't async-safe according to signal(7) */
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(void)memset(&act, 0, sizeof(act));
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act.sa_handler = SIG_DFL;
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act.sa_flags = 0;
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if ((sigemptyset(&act.sa_mask) == -1) ||
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(sigfillset(&fullmask) == -1) ||
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(sigemptyset(&mask) == -1) ||
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(sigaddset(&mask, sig) == -1))
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goto restore_none;
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/* Block all signals */
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if (sigprocmask(SIG_BLOCK, &fullmask, &origmask) == -1)
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goto restore_none;
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/* (use 'goto restore_mask' to restore state) */
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/* Enable the SIG_DFL handler */
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if (sigaction(sig, &act, &origact) == -1)
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goto restore_mask;
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/* (use 'goto restore_act' to restore state) */
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/* Raise the signal, and unblock the signal to deliver it */
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if ((raise(sig) == -1) ||
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(sigprocmask(SIG_UNBLOCK, &mask, NULL) == -1))
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goto restore_act;
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/* Flag successful raise() */
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retval = 0;
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/* Restore the original handler */
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restore_act:
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oerrno = errno;
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(void)sigaction(sig, &origact, NULL);
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errno = oerrno;
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/* Restore the original mask */
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restore_mask:
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oerrno = errno;
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(void)sigprocmask(SIG_SETMASK, &origmask, NULL);
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errno = oerrno;
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restore_none:
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return retval;
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}
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#endif /* ! HAVE_RAISE_DEFAULT_SIGNAL */
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