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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $FreeBSD: src/lib/libc/gen/signal.c,v 1.1.1.1.14.1 2001/03/05 09:52:13 obrien Exp $ 34 * $DragonFly: src/lib/libc/gen/signal.c,v 1.3 2005/01/31 22:29:15 dillon Exp $ 35 * 36 * @(#)signal.c 8.1 (Berkeley) 6/4/93 37 */ 38 39 /* 40 * Almost backwards compatible signal. 41 */ 42 #include "namespace.h" 43 #include <signal.h> 44 #include "un-namespace.h" 45 #include "libc_private.h" 46 47 sigset_t _sigintr; /* shared with siginterrupt */ 48 49 sig_t 50 signal(s, a) 51 int s; 52 sig_t a; 53 { 54 struct sigaction sa, osa; 55 56 sa.sa_handler = a; 57 sigemptyset(&sa.sa_mask); 58 sa.sa_flags = 0; 59 if (!sigismember(&_sigintr, s)) 60 sa.sa_flags |= SA_RESTART; 61 if (_sigaction(s, &sa, &osa) < 0) 62 return (SIG_ERR); 63 return (osa.sa_handler); 64 } 65