/*      $NetBSD: signal.c,v 1.16 2024/01/03 18:41:53 christos Exp $     */

/*
* Copyright (c) 1985, 1989, 1993
*      The Regents of the University of California.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)signal.c    8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: signal.c,v 1.16 2024/01/03 18:41:53 christos Exp $");
#endif
#endif /* LIBC_SCCS and not lint */

/*
* Almost backwards compatible signal.
*/
#include "namespace.h"
#include "extern.h"
#include <signal.h>

#ifdef __weak_alias
__weak_alias(signal,_signal)
#endif

sigset_t __sigintr;             /* shared with siginterrupt */

sig_t
signal(int s, sig_t a)
{
       struct sigaction sa, osa;

       sa.sa_handler = a;
       sigemptyset(&sa.sa_mask);
       sa.sa_flags = 0;
       if (!sigismember(&__sigintr, s))
               sa.sa_flags |= SA_RESTART;
       if (sigaction(s, &sa, &osa) < 0)
               return (SIG_ERR);
       return (osa.sa_handler);
}

void
(*bsd_signal(int sig, void (*func)(int)))(int)
{
       struct sigaction act, oact;

       act.sa_handler = func;
       act.sa_flags = SA_RESTART;

       sigemptyset(&act.sa_mask);
       sigaddset(&act.sa_mask, sig);
       if (sigaction(sig, &act, &oact) < 0)
               return (SIG_ERR);

       return (oact.sa_handler);
}