1 /* 2 * 3 * Copyright (c) International Business Machines Corp., 2001 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 13 * the GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 18 */ 19 20 /* 21 * NAME 22 * signal04.c 23 * 24 * DESCRIPTION 25 * signal04 - restore signals to default behavior 26 * 27 * ALGORITHM 28 * loop if that option was specified 29 * for each signal in siglist[] 30 * set the signal handler to our own and save the return value 31 * issue the signal system call to restore the default behavior 32 * check the return value 33 * if return value == -1 34 * issue a FAIL message, break remaining tests and cleanup 35 * if we are doing functional testing 36 * set the signal handler to our own again and save second return value 37 * if the first return value matches the second return value 38 * issue a PASS message 39 * else 40 * issue a FAIL message 41 * call cleanup 42 * 43 * USAGE: <for command-line> 44 * signal04 [-c n] [-f] [-i n] [-I x] [-p x] [-t] 45 * where, -c n : Run n copies concurrently. 46 * -f : Turn off functionality Testing. 47 * -i n : Execute test n times. 48 * -I x : Execute test for x seconds. 49 * -P x : Pause for x seconds between iterations. 50 * -t : Turn on syscall timing. 51 * 52 * History 53 * 07/2001 John George 54 * -Ported 55 * 56 * Restrictions 57 * none 58 */ 59 60 #include "test.h" 61 62 #include <errno.h> 63 #include <signal.h> 64 65 void cleanup(void); 66 void setup(void); 67 void sighandler(int); 68 69 char *TCID = "signal04"; 70 71 int siglist[] = { SIGHUP, SIGINT, SIGQUIT, SIGILL, SIGTRAP, SIGABRT, 72 SIGBUS, SIGFPE, SIGUSR1, SIGSEGV, SIGUSR2, SIGPIPE, SIGALRM, 73 SIGTERM, SIGCHLD, SIGCONT, SIGTSTP, SIGTTIN, 74 SIGTTOU, SIGURG, SIGXCPU, SIGXFSZ, SIGVTALRM, SIGPROF, 75 SIGWINCH, SIGIO, SIGPWR, SIGSYS 76 }; 77 78 int TST_TOTAL = sizeof(siglist) / sizeof(int); 79 80 typedef void (*sighandler_t) (int); 81 82 sighandler_t Tret; 83 84 int main(int ac, char **av) 85 { 86 int lc; 87 int i; 88 sighandler_t rval, first; 89 90 tst_parse_opts(ac, av, NULL, NULL); 91 92 setup(); /* global setup */ 93 94 /* The following loop checks looping state if -i option given */ 95 96 for (lc = 0; TEST_LOOPING(lc); lc++) { 97 /* reset tst_count in case we are looping */ 98 tst_count = 0; 99 100 /* 101 * loop through the list of signals and test each one 102 */ 103 for (i = 0; i < TST_TOTAL; i++) { 104 105 /* First reset the signal to the default 106 action to clear out any pre-test 107 execution settings */ 108 signal(siglist[i], SIG_DFL); 109 110 /* then set the handler to our own handler */ 111 if ((rval = signal(siglist[i], &sighandler)) == SIG_ERR) { 112 tst_brkm(TBROK, cleanup, "initial signal call" 113 " failed"); 114 } 115 116 /* store the return value */ 117 first = rval; 118 119 /* restore the default signal action */ 120 errno = 0; 121 Tret = signal(siglist[i], SIG_DFL); 122 TEST_ERRNO = errno; 123 124 if (Tret == SIG_ERR) { 125 tst_brkm(TFAIL, cleanup, "%s call failed - " 126 "errno = %d : %s", TCID, TEST_ERRNO, 127 strerror(TEST_ERRNO)); 128 } 129 130 /* now set the handler back to our own */ 131 if ((rval = signal(siglist[i], &sighandler)) 132 == SIG_ERR) { 133 tst_brkm(TBROK, cleanup, "initial " 134 "signal call failed"); 135 } 136 137 /* 138 * the first return value should equal the 139 * second one. 140 */ 141 if (rval == first) { 142 tst_resm(TPASS, "%s call succeeded " 143 "received %p.", TCID, rval); 144 } else { 145 tst_brkm(TFAIL, cleanup, "return " 146 "values for signal(%d) don't " 147 "match. Got %p, expected %p.", 148 siglist[i], rval, first); 149 } 150 } 151 } 152 153 cleanup(); 154 tst_exit(); 155 156 } 157 158 /* 159 * sighandler() - handle the signals 160 */ 161 void sighandler(int sig LTP_ATTRIBUTE_UNUSED) 162 { 163 } 164 165 /* 166 * setup() - performs all the ONE TIME setup for this test. 167 */ 168 void setup(void) 169 { 170 171 TEST_PAUSE; 172 } 173 174 /* 175 * cleanup() - performs all the ONE TIME cleanup for this test at completion 176 * or premature exit. 177 */ 178 void cleanup(void) 179 { 180 181 } 182
