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: lseek08 22 * 23 * Test Description: 24 * Verify that, lseek() call succeeds to set the file pointer position 25 * to the end of the file when 'whence' value set to SEEK_END and any 26 * attempts to read from that position should fail. 27 * 28 * Expected Result: 29 * lseek() should return the offset which is set to the file size measured 30 * in bytes. read() attempt should fail with -1 return value. 31 * $ 32 * Algorithm: 33 * Setup: 34 * Setup signal handling. 35 * Create temporary directory. 36 * Pause for SIGUSR1 if option specified. 37 * 38 * Test: 39 * Loop if the proper options are given. 40 * Execute system call 41 * Check return code, if system call failed (return=-1) 42 * Log the errno and Issue a FAIL message. 43 * Otherwise, 44 * Verify the Functionality of system call 45 * if successful, 46 * Issue Functionality-Pass message. 47 * Otherwise, 48 * Issue Functionality-Fail message. 49 * Cleanup: 50 * Print errno log and/or timing stats if options given 51 * Delete the temporary directory created. 52 * 53 * Usage: <for command-line> 54 * lseek08 [-c n] [-f] [-i n] [-I x] [-P x] [-t] 55 * where, -c n : Run n copies concurrently. 56 * -f : Turn off functionality Testing. 57 * -i n : Execute test n times. 58 * -I x : Execute test for x seconds. 59 * -P x : Pause for x seconds between iterations. 60 * -t : Turn on syscall timing. 61 * 62 * HISTORY 63 * 07/2001 Ported by Wayne Boyer 64 * 65 * RESTRICTIONS: 66 * None. 67 */ 68 69 #include <stdio.h> 70 #include <unistd.h> 71 #include <sys/types.h> 72 #include <errno.h> 73 #include <fcntl.h> 74 #include <utime.h> 75 #include <string.h> 76 #include <sys/stat.h> 77 #include <signal.h> 78 79 #include "test.h" 80 81 #define TEMP_FILE "tmp_file" 82 #define FILE_MODE S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH 83 84 char *TCID = "lseek08"; 85 int TST_TOTAL = 1; 86 int fildes; /* file handle for temp file */ 87 size_t file_size; /* size of the temporary file */ 88 89 void setup(); /* Main setup function of test */ 90 void cleanup(); /* cleanup function for the test */ 91 92 int main(int ac, char **av) 93 { 94 int lc; 95 char read_buf[1]; /* data read from temp. file */ 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 * Invoke lseek(2) to move the read/write file 107 * pointer/handle to the END of the file. 108 */ 109 TEST(lseek(fildes, 0, SEEK_END)); 110 111 if (TEST_RETURN == -1) { 112 tst_resm(TFAIL | TTERRNO, 113 "lseek of %s failed", TEMP_FILE); 114 continue; 115 } 116 /* 117 * Check if the return value from lseek(2) 118 * is equal to the file_size. 119 */ 120 if (TEST_RETURN != file_size) { 121 tst_resm(TFAIL, "lseek() returned incorrect " 122 "value %ld, expected %zu", 123 TEST_RETURN, file_size); 124 continue; 125 } 126 /* 127 * The return value is okay, now attempt to read data 128 * from the file. This should fail as the file pointer 129 * should be pointing to END OF FILE. 130 */ 131 read_buf[0] = '\0'; 132 if (read(fildes, &read_buf, sizeof(read_buf)) > 0) { 133 tst_resm(TFAIL, "read() successful on %s", 134 TEMP_FILE); 135 } else { 136 tst_resm(TPASS, "Functionality of lseek() on " 137 "%s successful", TEMP_FILE); 138 } 139 } 140 141 cleanup(); 142 tst_exit(); 143 } 144 145 /* 146 * setup() - performs all ONE TIME setup for this test. 147 * Create a temporary directory and change directory to it. 148 * Create a test file under temporary directory and write some 149 * data into it. 150 * Get the size of the file using fstat(). 151 */ 152 void setup(void) 153 { 154 struct stat stat_buf; /* struct. buffer for stat(2) */ 155 char write_buf[BUFSIZ]; /* buffer to hold data */ 156 157 tst_sig(NOFORK, DEF_HANDLER, cleanup); 158 159 TEST_PAUSE; 160 161 tst_tmpdir(); 162 163 /* Get the data to be written to temporary file */ 164 strcpy(write_buf, "abcdefg\n"); 165 166 /* Creat/open a temporary file under above directory */ 167 if ((fildes = open(TEMP_FILE, O_RDWR | O_CREAT, FILE_MODE)) == -1) { 168 tst_brkm(TBROK | TERRNO, cleanup, 169 "open(%s, O_RDWR|O_CREAT, %#o) failed", 170 TEMP_FILE, FILE_MODE); 171 } 172 173 /* Write data into temporary file */ 174 if (write(fildes, write_buf, strlen(write_buf)) <= 0) { 175 tst_brkm(TBROK | TERRNO, cleanup, 176 "writing to %s failed", TEMP_FILE); 177 } 178 179 /* Get the size of the file using fstat */ 180 if (fstat(fildes, &stat_buf) < 0) { 181 tst_brkm(TBROK | TERRNO, cleanup, 182 "fstat of %s failed", TEMP_FILE); 183 } 184 185 file_size = stat_buf.st_size; 186 } 187 188 /* 189 * cleanup() - performs all ONE TIME cleanup for this test at 190 * completion or premature exit. 191 * Remove the test directory and testfile created in the setup. 192 */ 193 void cleanup(void) 194 { 195 196 /* Close the temporary file created */ 197 if (close(fildes) < 0) { 198 tst_brkm(TFAIL, NULL, 199 "close(%s) Failed, errno=%d : %s:", 200 TEMP_FILE, errno, strerror(errno)); 201 } 202 203 tst_rmdir(); 204 205 } 206
