1 /* 2 * Copyright (c) 2005, Bull S.A.. All rights reserved. 3 * Created by: Sebastien Decugis 4 * Copyright (c) 2013 Cyril Hrubis <chrubis (at) suse.cz> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of version 2 of the GNU General Public License as 8 * published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it would be useful, but 11 * WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 13 * 14 * You should have received a copy of the GNU General Public License along 15 * with this program; if not, write the Free Software Foundation, Inc., 16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 17 * 18 * This sample test aims to check the following assertions: 19 * 20 * If the signal action was set with the signal() function, getting it into oact 21 * then reinstalling it with act must be valid. 22 * 23 * The steps are: 24 * -> register a signal handler for SIGALRM with signal(). 25 * -> check this signal handler works. 26 * -> change the signal handler with sigaction, saving old handler in oact. 27 * -> check the new signal handler works. 28 * -> set the old signal handler back 29 * -> check the old signal handler still works. 30 * 31 * The test fails if a signal handler does not work as expected. 32 */ 33 34 /* We are testing conformance to IEEE Std 1003.1, 2003 Edition */ 35 #define _POSIX_C_SOURCE 200112L 36 37 #include <stdarg.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <unistd.h> 42 #include <signal.h> 43 #include <errno.h> 44 45 #include "posixtest.h" 46 47 static volatile sig_atomic_t called = 1; 48 49 static void handler_1() 50 { 51 called++; 52 } 53 54 static void handler_2() 55 { 56 called--; 57 } 58 59 int main(void) 60 { 61 int ret; 62 63 struct sigaction sa, save; 64 65 if (signal(SIGALRM, handler_1) == SIG_ERR) { 66 perror("Failed to register signal handler"); 67 return PTS_UNRESOLVED; 68 } 69 70 /* As whether signal handler is restored to default when executed 71 is implementation defined, we cannot check it was registered here. */ 72 73 /* Set the new signal handler with sigaction*/ 74 sa.sa_flags = 0; 75 76 sa.sa_handler = handler_2; 77 78 ret = sigemptyset(&sa.sa_mask); 79 80 if (ret != 0) { 81 perror("Failed to empty signal set"); 82 return PTS_UNRESOLVED; 83 } 84 85 ret = sigaction(SIGALRM, &sa, &save); 86 87 if (ret != 0) { 88 perror("Failed to register signal handler"); 89 return PTS_UNRESOLVED; 90 } 91 92 /* Check the signal handler has been set up */ 93 ret = raise(SIGALRM); 94 95 if (ret != 0) { 96 perror("Failed to raise signal"); 97 return PTS_UNRESOLVED; 98 } 99 100 if (called != 0) { 101 fprintf(stderr, "Handler was not executed\n"); 102 return PTS_FAIL; 103 } 104 105 /* Restore the first signal handler */ 106 ret = sigaction(SIGALRM, &save, 0); 107 108 if (ret != 0) { 109 perror("Failed to restore signal handler"); 110 return PTS_UNRESOLVED; 111 } 112 113 /* Check the signal handler has been set up */ 114 ret = raise(SIGALRM); 115 116 if (ret != 0) { 117 perror("Failed to raise signal"); 118 return PTS_UNRESOLVED; 119 } 120 121 if (called != 1) { 122 fprintf(stderr, "Handler was not executed\n"); 123 return PTS_FAIL; 124 } 125 126 printf("Test PASSED\n"); 127 return PTS_PASS; 128 } 129
