1 /* 2 * Copyright (c) International Business Machines Corp., 2001 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 12 * the GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 19 /* 20 * Test Description: 21 * Verify that mmap() fails to map a file creating a mapped region 22 * when the file specified by file descriptor is not valid. 23 * 24 * Expected Result: 25 * mmap() should fail returning -1 and errno should get set to EBADF. 26 * 27 * HISTORY 28 * 07/2001 Ported by Wayne Boyer 29 */ 30 #include <stdio.h> 31 #include <stdlib.h> 32 #include <sys/types.h> 33 #include <errno.h> 34 #include <unistd.h> 35 #include <fcntl.h> 36 #include <string.h> 37 #include <signal.h> 38 #include <sys/stat.h> 39 #include <sys/mman.h> 40 41 #include "test.h" 42 43 #define TEMPFILE "mmapfile" 44 45 char *TCID = "mmap08"; 46 int TST_TOTAL = 1; 47 48 static size_t page_sz; 49 static char *addr; 50 static int fildes; 51 52 static void setup(void); 53 static void cleanup(void); 54 55 int main(int ac, char **av) 56 { 57 int lc; 58 59 tst_parse_opts(ac, av, NULL, NULL); 60 61 setup(); 62 63 for (lc = 0; TEST_LOOPING(lc); lc++) { 64 65 tst_count = 0; 66 67 /* 68 * Call mmap to map the temporary file 'TEMPFILE' 69 * which is already closed. so, fildes is not valid. 70 */ 71 errno = 0; 72 addr = mmap(0, page_sz, PROT_WRITE, 73 MAP_FILE | MAP_SHARED, fildes, 0); 74 TEST_ERRNO = errno; 75 76 /* Check for the return value of mmap() */ 77 if (addr != MAP_FAILED) { 78 tst_resm(TFAIL, "mmap() didn't fail (%p != %p)", 79 addr, MAP_FAILED); 80 /* Unmap the mapped memory */ 81 if (munmap(addr, page_sz) != 0) { 82 tst_brkm(TBROK, cleanup, "munmap() failed"); 83 } 84 continue; 85 } 86 if (TEST_ERRNO == EBADF) { 87 tst_resm(TPASS, "mmap failed with EBADF"); 88 } else { 89 tst_resm(TFAIL | TERRNO, 90 "mmap failed with an invalid errno"); 91 } 92 } 93 94 cleanup(); 95 tst_exit(); 96 } 97 98 static void setup(void) 99 { 100 char *tst_buff; 101 102 tst_sig(NOFORK, DEF_HANDLER, cleanup); 103 104 TEST_PAUSE; 105 106 page_sz = getpagesize(); 107 108 if ((tst_buff = calloc(page_sz, sizeof(char))) == NULL) { 109 tst_brkm(TFAIL, NULL, 110 "calloc() failed to allocate space for tst_buff"); 111 } 112 113 /* Fill the test buffer with the known data */ 114 memset(tst_buff, 'A', page_sz); 115 116 tst_tmpdir(); 117 118 /* Creat a temporary file used for mapping */ 119 if ((fildes = open(TEMPFILE, O_WRONLY | O_CREAT, 0666)) < 0) { 120 free(tst_buff); 121 tst_brkm(TFAIL, cleanup, "opening %s failed", TEMPFILE); 122 } 123 124 /* Write test buffer contents into temporary file */ 125 if (write(fildes, tst_buff, page_sz) != page_sz) { 126 free(tst_buff); 127 tst_brkm(TFAIL, cleanup, "writing to %s failed", TEMPFILE); 128 } 129 130 /* Free the memory allocated for test buffer */ 131 free(tst_buff); 132 133 /* Close the temporary file opened for writing */ 134 if (close(fildes) < 0) { 135 tst_brkm(TFAIL, cleanup, "closing %s failed", TEMPFILE); 136 } 137 } 138 139 static void cleanup(void) 140 { 141 tst_rmdir(); 142 } 143
