1 /* 2 * Copyright (c) 1999-2004 Damien Miller <djm@mindrot.org> 3 * 4 * Permission to use, copy, modify, and distribute this software for any 5 * purpose with or without fee is hereby granted, provided that the above 6 * copyright notice and this permission notice appear in all copies. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 15 */ 16 17 #include "includes.h" 18 19 #include <signal.h> 20 #include <string.h> 21 #include <unistd.h> 22 23 #include "openbsd-compat/bsd-signal.h" 24 25 #undef signal 26 27 mysig_t 28 mysignal(int sig, mysig_t act) 29 { 30 struct sigaction sa, osa; 31 32 if (sigaction(sig, NULL, &osa) == -1) 33 return (mysig_t) -1; 34 if (osa.sa_handler != act) { 35 memset(&sa, 0, sizeof(sa)); 36 sigemptyset(&sa.sa_mask); 37 sa.sa_flags = 0; 38 #ifdef SA_INTERRUPT 39 if (sig == SIGALRM) 40 sa.sa_flags |= SA_INTERRUPT; 41 #endif 42 sa.sa_handler = act; 43 if (sigaction(sig, &sa, NULL) == -1) 44 return (mysig_t) -1; 45 } 46 return (osa.sa_handler); 47 } 48