1/* 2 * Copyright (c) Wipro Technologies Ltd, 2002. All Rights Reserved. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms of version 2 of the GNU General Public License as 6 * published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it would be useful, but 9 * WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 11 * 12 * You should have received a copy of the GNU General Public License along 13 * with this program; if not, write the Free Software Foundation, Inc., 14 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 15 * 16 */ 17/********************************************************** 18 * 19 * TEST IDENTIFIER : flock04 20 * 21 * EXECUTED BY : anyone 22 * 23 * TEST TITLE : Testing different locks on flock(2) 24 * 25 * TEST CASE TOTAL : 2 26 * 27 * AUTHOR : Vatsal Avasthi <vatsal.avasthi@wipro.com> 28 * 29 * SIGNALS 30 * Uses SIGUSR1 to pause before test if option set. 31 * (See the parse_opts(3) man page). 32 * 33 * DESCRIPTION 34 * Tests to verify flock(2) behavior with different locking combinations along 35 * with LOCK_SH. 36 * $ 37 * Setup: 38 * Setup signal handling. 39 * Pause for SIGUSR1 if option specified. 40 * Create a temporary directory and chdir to it. 41 * Create a temporary file 42 * 43 * Test: 44 * Loop if proper options are given. 45 * Parent flocks(2) a file 46 * fork() a child process 47 * Child tries to flock() the already flocked file with different types of locks 48 * Check return code, if system call failed (return == -1) 49 * Log the error number and issue a FAIL message 50 * otherwise issue a PASS message 51 * 52 * Cleanup: 53 * Print errno log and/or timing stats if options given 54 * Deletes temporary directory. 55 * 56 * USAGE: <for command-line> 57 * flock04 [-c n] [-e] [-i n] [-I x] [-P x] [-t] [-h] [-f] [-p] 58 * where, -c n : Run n copies concurrently. 59 * -f : Turn off functional testing 60 * -e : Turn on errno logging. 61 * -h : Show help screen $ 62 * -i n : Execute test n times. 63 * -I x : Execute test for x seconds. 64 * -p : Pause for SIGUSR1 before starting 65 * -P x : Pause for x seconds between iterations. 66 * -t : Turn on syscall timing. 67 * 68 ****************************************************************/ 69 70#include <errno.h> 71#include <stdio.h> 72#include <unistd.h> 73#include <sys/types.h> 74#include <sys/wait.h> 75#include <sys/file.h> 76#include <sys/stat.h> 77#include <fcntl.h> 78#include "test.h" 79#include "safe_macros.h" 80 81void setup(void); 82void cleanup(void); 83 84char *TCID = "flock04"; 85int TST_TOTAL = 2; 86char filename[100]; 87int fd, fd1, status; 88 89int main(int argc, char **argv) 90{ 91 int lc, retval; 92 pid_t pid; 93 94 tst_parse_opts(argc, argv, NULL, NULL); 95 96 setup(); 97 98 for (lc = 0; TEST_LOOPING(lc); lc++) { 99 100 tst_count = 0; 101 102 TEST(flock(fd, LOCK_SH)); 103 if (TEST_RETURN == 0) { 104 105 pid = FORK_OR_VFORK(); 106 if (pid == -1) 107 tst_brkm(TBROK | TERRNO, cleanup, 108 "fork failed"); 109 if (pid == 0) { 110 fd1 = open(filename, O_RDONLY); 111 retval = flock(fd1, LOCK_SH | LOCK_NB); 112 if (retval == -1) 113 tst_resm(TFAIL, 114 "flock() FAILED to acquire shared lock on existing " 115 "Share Locked file"); 116 else 117 tst_resm(TPASS, 118 "flock() PASSED in acquiring shared lock on " 119 "Share Locked file"); 120 exit(0); 121 } else { 122 SAFE_WAIT(cleanup, &status); 123 } 124 125 pid = FORK_OR_VFORK(); 126 if (pid == -1) 127 tst_brkm(TBROK | TERRNO, cleanup, 128 "fork failed"); 129 130 if (pid == 0) { 131 fd1 = open(filename, O_RDWR); 132 retval = flock(fd1, LOCK_EX | LOCK_NB); 133 if (retval == -1) { 134 tst_resm(TPASS, 135 "flock() failed to acquire exclusive lock on existing " 136 "share locked file as expected"); 137 } else { 138 tst_resm(TFAIL, 139 "flock() unexpectedly passed in acquiring exclusive lock on " 140 "Share Locked file"); 141 } 142 exit(0); 143 } else if (wait(&status) == -1) 144 tst_resm(TBROK | TERRNO, "wait failed"); 145 TEST(flock(fd, LOCK_UN)); 146 } else 147 tst_resm(TFAIL | TERRNO, "flock failed"); 148 149 close(fd); 150 close(fd1); 151 } 152 153 cleanup(); 154 tst_exit(); 155} 156 157void setup(void) 158{ 159 160 tst_sig(FORK, DEF_HANDLER, cleanup); 161 162 TEST_PAUSE; 163 164 tst_tmpdir(); 165 166 sprintf(filename, "flock04.%d", getpid()); 167 168 fd = open(filename, O_CREAT | O_TRUNC | O_RDWR, 0666); 169 if (fd == -1) 170 tst_brkm(TFAIL, cleanup, "creating a new file failed"); 171} 172 173void cleanup(void) 174{ 175 unlink(filename); 176 177 tst_rmdir(); 178} 179