1/* $OpenBSD: signal.c,v 1.11 2019/06/28 13:32:41 deraadt Exp $ */ 2/* 3 * Copyright (c) 1985, 1989, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31/* 32 * Almost backwards compatible signal. 33 */ 34#include <signal.h> 35#include <string.h> 36 37sigset_t __sigintr; /* shared with siginterrupt */ 38 39sig_t 40signal(int s, sig_t a) 41{ 42 struct sigaction sa, osa; 43 44 memset(&sa, 0, sizeof sa); 45 sa.sa_handler = a; 46 sigemptyset(&sa.sa_mask); 47 sa.sa_flags = 0; 48 if (!sigismember(&__sigintr, s)) 49 sa.sa_flags |= SA_RESTART; 50 if (WRAP(sigaction)(s, &sa, &osa) == -1) 51 return (SIG_ERR); 52 return (osa.sa_handler); 53} 54 55__weak_alias(bsd_signal, signal); 56