1 /* 2 * Copyright (c) 1985, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD: src/lib/libc/gen/signal.c,v 1.1.1.1.14.1 2001/03/05 09:52:13 obrien Exp $ 30 * $DragonFly: src/lib/libc/gen/signal.c,v 1.4 2005/11/13 00:07:42 swildner Exp $ 31 * 32 * @(#)signal.c 8.1 (Berkeley) 6/4/93 33 */ 34 35 /* 36 * Almost backwards compatible signal. 37 */ 38 #include "namespace.h" 39 #include <signal.h> 40 #include "un-namespace.h" 41 #include "libc_private.h" 42 43 sigset_t _sigintr; /* shared with siginterrupt */ 44 45 sig_t 46 signal(int s, sig_t a) 47 { 48 struct sigaction sa, osa; 49 50 sa.sa_handler = a; 51 sigemptyset(&sa.sa_mask); 52 sa.sa_flags = 0; 53 if (!sigismember(&_sigintr, s)) 54 sa.sa_flags |= SA_RESTART; 55 if (_sigaction(s, &sa, &osa) < 0) 56 return (SIG_ERR); 57 return (osa.sa_handler); 58 } 59