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 * Test Name: vfork02 22 * 23 * Test Description: 24 * Fork a process using vfork() and verify that, the pending signals in 25 * the parent are not pending in the child process. 26 * $ 27 * Expected Result: 28 * The signal which is pending in the parent should not be pending in the 29 * child process. 30 * 31 * Algorithm: 32 * Setup: 33 * Setup signal handling. 34 * Pause for SIGUSR1 if option specified. 35 * 36 * Test: 37 * Loop if the proper options are given. 38 * Execute system call 39 * Check return code, if system call failed (return=-1) 40 * Log the errno and Issue a FAIL message. 41 * Otherwise, 42 * Verify the Functionality of system call 43 * if successful, 44 * Issue Functionality-Pass message. 45 * Otherwise, 46 * Issue Functionality-Fail message. 47 * Cleanup: 48 * Print errno log and/or timing stats if options given 49 * 50 * Usage: <for command-line> 51 * vfork02 [-c n] [-e] [-f] [-i n] [-I x] [-p x] [-t] 52 * where, -c n : Run n copies concurrently. 53 * -e : Turn on errno logging. 54 * -f : Turn off functionality Testing. 55 * -i n : Execute test n times. 56 * -I x : Execute test for x seconds. 57 * -P x : Pause for x seconds between iterations. 58 * -t : Turn on syscall timing. 59 * 60 * History 61 * 07/2001 John George 62 * -Ported 63 * 64 * Restrictions: 65 * None. 66 * 67 */ 68 #define _GNU_SOURCE 1 69 70 #include <stdio.h> 71 #include <sys/types.h> 72 #include <errno.h> 73 #include <unistd.h> 74 #include <fcntl.h> 75 #include <string.h> 76 #include <signal.h> 77 #include <sys/stat.h> 78 #include <sys/wait.h> 79 80 #include "test.h" 81 #include "safe_macros.h" 82 83 char *TCID = "vfork02"; 84 int TST_TOTAL = 1; 85 86 void setup(); /* Main setup function of test */ 87 void cleanup(); /* cleanup function for the test */ 88 void sig_handler(); /* signal catching function */ 89 90 int main(int ac, char **av) 91 { 92 int lc; 93 pid_t cpid; /* process id of the child process */ 94 int exit_status; /* exit status of child process */ 95 sigset_t PendSig; /* variable to hold pending signal */ 96 97 tst_parse_opts(ac, av, NULL, NULL); 98 99 setup(); 100 101 for (lc = 0; TEST_LOOPING(lc); lc++) { 102 103 tst_count = 0; 104 105 /* 106 * Call vfork(2) to create a child process without 107 * fully copying the address space of parent. 108 */ 109 TEST(vfork()); 110 111 if ((cpid = TEST_RETURN) == -1) { 112 tst_resm(TFAIL, "vfork() Failed, errno=%d : %s", 113 TEST_ERRNO, strerror(TEST_ERRNO)); 114 } else if (cpid == 0) { /* Child process */ 115 /* 116 * Check whether the pending signal SIGUSR1 117 * in the parent is also pending in the child 118 * process by storing it in a variable. 119 */ 120 if (sigpending(&PendSig) == -1) { 121 tst_resm(TFAIL, "sigpending function " 122 "failed in child"); 123 _exit(1); 124 } 125 126 /* Check if SIGUSR1 is pending in child */ 127 if (sigismember(&PendSig, SIGUSR1) != 0) { 128 tst_resm(TFAIL, "SIGUSR1 also pending " 129 "in child process"); 130 _exit(1); 131 } 132 133 /* 134 * Exit with normal exit code if everything 135 * fine 136 */ 137 _exit(0); 138 } else { /* parent process */ 139 /* 140 * Let the parent process wait till child completes 141 * its execution. 142 */ 143 wait(&exit_status); 144 145 /* Check for the exit status of child process */ 146 if (WEXITSTATUS(exit_status) == 0) { 147 tst_resm(TPASS, "Call to vfork() " 148 "successful"); 149 } else if (WEXITSTATUS(exit_status) == 1) { 150 tst_resm(TFAIL, 151 "Child process exited abnormally"); 152 } 153 } 154 tst_count++; /* incr. TEST_LOOP counter */ 155 } 156 157 cleanup(); 158 tst_exit(); 159 160 } 161 162 /* 163 * void 164 * setup() - performs all ONE TIME setup for this test. 165 * This function installs signal handler for SIGUSR1, puts signal SIGUSR1 166 * on hold and then sends the signal SIGUSR1 to itself so that it is in 167 * pending state. 168 */ 169 void setup(void) 170 { 171 sigset_t PendSig; /* variable to hold pending signal */ 172 173 tst_sig(FORK, DEF_HANDLER, cleanup); 174 175 TEST_PAUSE; 176 177 /* Install the signal handler */ 178 if (signal(SIGUSR1, sig_handler) == SIG_ERR) { 179 tst_brkm(TBROK, cleanup, "Fails to catch the signal SIGUSR1"); 180 } 181 182 /* Hold the signal SIGUSR1 */ 183 if (sighold(SIGUSR1) == -1) { 184 tst_brkm(TBROK, cleanup, 185 "sighold failed to hold the signal SIGUSR1"); 186 } 187 188 /* Send the signal SIGUSR1 to itself so that SIGUSR1 is pending */ 189 SAFE_KILL(cleanup, getpid(), SIGUSR1); 190 191 /* If SIGUSR1 is not pending in the parent, fail */ 192 if (sigpending(&PendSig) == -1) { 193 tst_brkm(TBROK, cleanup, 194 "sigpending function failed in parent"); 195 } 196 197 /* Check if SIGUSR1 is pending in parent */ 198 if (sigismember(&PendSig, SIGUSR1) != 1) { 199 tst_brkm(TBROK, cleanup, 200 "SIGUSR1 signal is not pending in parent"); 201 } 202 } 203 204 /* 205 * void 206 * sig_handler() - signal catching function for 'SIGUSR1' signal. 207 * $ 208 * This is a null function and used only to catch the above signal 209 * generated in parent process. 210 */ 211 void sig_handler(void) 212 { 213 } 214 215 /* 216 * void 217 * cleanup() - performs all ONE TIME cleanup for this test at 218 * completion or premature exit. 219 * Release the signal 'SIGUSR1' if still in pending state. 220 */ 221 void cleanup(void) 222 { 223 224 /* Release the signal 'SIGUSR1' if in pending state */ 225 if (sigrelse(SIGUSR1) == -1) { 226 tst_brkm(TBROK, NULL, "Failed to release 'SIGUSR1' in cleanup"); 227 } 228 229 } 230
