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 : readlink01 22 * 23 * Test Description : 24 * Verify that, readlink will succeed to read the contents of the symbolic 25 * link created the process. 26 * 27 * Expected Result: 28 * readlink() should return the contents of symbolic link path in the buffer 29 * on success. 30 * 31 * Algorithm: 32 * Setup: 33 * Setup signal handling. 34 * Create temporary directory. 35 * Pause for SIGUSR1 if option specified. 36 * 37 * Test: 38 * Loop if the proper options are given. 39 * Execute system call 40 * Check return code, if system call failed (return=-1) 41 * Issue a FAIL message. 42 * Otherwise, 43 * Verify the Functionality of system call 44 * if successful, 45 * Issue Functionality-Pass message. 46 * Otherwise, 47 * Issue Functionality-Fail message. 48 * Cleanup: 49 * Print errno log and/or timing stats if options given 50 * Delete the temporary directory created. 51 * 52 * Usage: <for command-line> 53 * readlink01 [-c n] [-f] [-i n] [-I x] [-P x] [-t] 54 * where, -c n : Run n copies concurrently. 55 * -f : Turn off functionality Testing. 56 * -i n : Execute test n times. 57 * -I x : Execute test for x seconds. 58 * -P x : Pause for x seconds between iterations. 59 * -t : Turn on syscall timing. 60 * 61 * HISTORY 62 * 07/2001 Ported by Wayne Boyer 63 * 64 * RESTRICTIONS: 65 * This test should be run by 'non-super-user' only. 66 * 67 */ 68 #include <unistd.h> 69 #include <fcntl.h> 70 #include <errno.h> 71 #include <sys/stat.h> 72 #include <pwd.h> 73 74 #include "test.h" 75 #include "safe_macros.h" 76 77 #define TESTFILE "testfile" 78 #define SYMFILE "slink_file" 79 #define FILE_MODE S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH 80 #define MAX_SIZE 256 81 82 char *TCID = "readlink01"; 83 int TST_TOTAL = 1; 84 85 const int exp_val = sizeof(TESTFILE) - 1; /* strlen of testfile */ 86 87 void setup(); 88 void cleanup(); 89 90 char nobody_uid[] = "nobody"; 91 struct passwd *ltpuser; 92 93 int main(int ac, char **av) 94 { 95 char buffer[MAX_SIZE]; /* temporary buffer to hold symlink contents */ 96 int lc; 97 98 tst_parse_opts(ac, av, NULL, NULL); 99 100 setup(); 101 102 for (lc = 0; TEST_LOOPING(lc); lc++) { 103 104 tst_count = 0; 105 106 /* 107 * Call readlink(2) to read the contents of 108 * symlink into a buffer. 109 */ 110 TEST(readlink(SYMFILE, buffer, sizeof(buffer))); 111 112 if (TEST_RETURN == -1) { 113 tst_resm(TFAIL, 114 "readlink() on %s failed, errno=%d : %s", 115 SYMFILE, TEST_ERRNO, strerror(TEST_ERRNO)); 116 continue; 117 } 118 119 /* 120 * Compare the return value of readlink() 121 * with the expected value which is the 122 * strlen() of testfile. 123 */ 124 if (TEST_RETURN == exp_val) { 125 /* Check for the contents of buffer */ 126 if (memcmp(buffer, TESTFILE, exp_val) != 0) { 127 tst_resm(TFAIL, "Pathname %s and buffer" 128 " contents %s differ", 129 TESTFILE, buffer); 130 } else { 131 tst_resm(TPASS, "readlink() " 132 "functionality on '%s' is " 133 "correct", SYMFILE); 134 } 135 } else { 136 tst_resm(TFAIL, "readlink() return value %ld " 137 "does't match, Expected %d", 138 TEST_RETURN, exp_val); 139 } 140 } 141 142 cleanup(); 143 tst_exit(); 144 } 145 146 /* 147 * setup() - performs all ONE TIME setup for this test. 148 * 149 * Create a temporary directory and change directory to it. 150 * Create a test file under temporary directory and close it 151 * Create a symbolic link of testfile. 152 */ 153 void setup(void) 154 { 155 int fd; /* file handle for testfile */ 156 157 tst_require_root(); 158 159 if ((ltpuser = getpwnam(nobody_uid)) == NULL) { 160 tst_brkm(TBROK, cleanup, "getpwname(nobody_uid) failed "); 161 } 162 SAFE_SETEUID(cleanup, ltpuser->pw_uid); 163 164 tst_sig(NOFORK, DEF_HANDLER, cleanup); 165 166 TEST_PAUSE; 167 168 tst_tmpdir(); 169 170 if ((fd = open(TESTFILE, O_RDWR | O_CREAT, FILE_MODE)) == -1) { 171 tst_brkm(TBROK | TERRNO, cleanup, 172 "open(%s, O_RDWR|O_CREAT, %#o) failed", 173 TESTFILE, FILE_MODE); 174 } 175 176 if (close(fd) == -1) { 177 tst_resm(TWARN | TERRNO, "close(%s) failed", TESTFILE); 178 } 179 180 /* Create a symlink of testfile under temporary directory */ 181 SAFE_SYMLINK(cleanup, TESTFILE, SYMFILE); 182 } 183 184 /* 185 * cleanup() - performs all ONE TIME cleanup for this test at 186 * completion or premature exit. 187 * 188 * Remove the test directory and testfile created in the setup. 189 */ 190 void cleanup(void) 191 { 192 193 tst_rmdir(); 194 195 } 196
