openbsd-compat/bsd-signal.c

/*
 * Copyright (c) 1999-2004 Damien Miller <djm@mindrot.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include "includes.h"

#include <signal.h>
#include <string.h>
#include <unistd.h>

#include "openbsd-compat/bsd-signal.h"

#undef signal

mysig_t
mysignal(int sig, mysig_t act)
{
#ifdef HAVE_SIGACTION
	struct sigaction sa, osa;

	if (sigaction(sig, NULL, &osa) == -1)
		return (mysig_t) -1;
	if (osa.sa_handler != act) {
		memset(&sa, 0, sizeof(sa));
		sigemptyset(&sa.sa_mask);
		sa.sa_flags = 0;
#ifdef SA_INTERRUPT
		if (sig == SIGALRM)
			sa.sa_flags |= SA_INTERRUPT;
#endif
		sa.sa_handler = act;
		if (sigaction(sig, &sa, NULL) == -1)
			return (mysig_t) -1;
	}
	return (osa.sa_handler);
#else
	return (signal(sig, act));
#endif
}

#if !defined(HAVE_STRSIGNAL)
char *strsignal(int sig)
{
	static char buf[16];

	(void)snprintf(buf, sizeof(buf), "%d", sig);
	return buf;
}
#endif