1 /* 2 * Copyright (c) 1985, 1989 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 */ 17 18 #if defined(LIBC_SCCS) && !defined(lint) 19 static char sccsid[] = "@(#)signal.c 5.4 (Berkeley) 08/26/89"; 20 #endif /* LIBC_SCCS and not lint */ 21 22 /* 23 * Almost backwards compatible signal. 24 */ 25 #include <signal.h> 26 27 sigset_t _sigintr; /* shared with siginterrupt */ 28 29 sig_t 30 signal(s, a) 31 int s; 32 sig_t a; 33 { 34 struct sigaction sa, osa; 35 36 sa.sa_handler = a; 37 sigemptyset(&sa.sa_mask); 38 sa.sa_flags = 0; 39 if (!sigismember(&_sigintr, s)) 40 sa.sa_flags |= SA_RESTART; 41 if (sigaction(s, &sa, &osa) < 0) 42 return (BADSIG); 43 return (osa.sa_handler); 44 } 45