1 /* 2 * This program is free software; you can redistribute it and/or modify 3 * it under the terms of the GNU General Public License version 2. 4 * 5 * This program is distributed in the hope that it will be useful, 6 * but WITHOUT ANY WARRANTY; without even the implied warranty of 7 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 8 * GNU General Public License for more details. 9 * 10 * Test that the shm_open() function establish a connection between a shared 11 * memory object and a file descriptor. 12 * 13 * Step: 14 * 1. Create a file a shared memory object using shm_open(). 15 * 2. Write in the file referenced by the file descriptor return by 16 * shm_open(). 17 * 3. Reopen the file with shm_open(). 18 * 4. Read in the file. 19 * The test pass if it read what it was previously written. 20 */ 21 22 /* ftruncate was formerly an XOPEN extension. We define _XOPEN_SOURCE here to 23 avoid warning if the implementation does not program ftruncate as a base 24 interface */ 25 #define _XOPEN_SOURCE 600 26 27 #include <stdio.h> 28 #include <sys/mman.h> 29 #include <sys/stat.h> 30 #include <unistd.h> 31 #include <string.h> 32 #include <fcntl.h> 33 #include "posixtest.h" 34 35 #define BUF_SIZE 8 36 #define SHM_NAME "posixtest_1-1" 37 38 int main(void) 39 { 40 int fd; 41 char str[BUF_SIZE] = "qwerty"; 42 char *buf; 43 44 fd = shm_open(SHM_NAME, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR); 45 if (fd == -1) { 46 perror("An error occurs when calling shm_open()"); 47 return PTS_UNRESOLVED; 48 } 49 50 if (ftruncate(fd, BUF_SIZE) != 0) { 51 perror("An error occurs when calling ftruncate()"); 52 shm_unlink(SHM_NAME); 53 return PTS_UNRESOLVED; 54 } 55 56 buf = mmap(NULL, BUF_SIZE, PROT_WRITE, MAP_SHARED, fd, 0); 57 if (buf == MAP_FAILED) { 58 perror("An error occurs when calling mmap()"); 59 shm_unlink(SHM_NAME); 60 return PTS_UNRESOLVED; 61 } 62 63 strcpy(buf, str); 64 65 fd = shm_open(SHM_NAME, O_RDONLY, S_IRUSR | S_IWUSR); 66 if (fd == -1) { 67 perror("An error occurs when calling shm_open()"); 68 shm_unlink(SHM_NAME); 69 return PTS_UNRESOLVED; 70 } 71 72 buf = mmap(NULL, BUF_SIZE, PROT_READ, MAP_SHARED, fd, 0); 73 if (buf == MAP_FAILED) { 74 perror("An error occurs when calling mmap()"); 75 shm_unlink(SHM_NAME); 76 return PTS_UNRESOLVED; 77 } 78 79 shm_unlink(SHM_NAME); 80 if (strcmp(buf, str) == 0) { 81 printf("Test PASSED\n"); 82 return PTS_PASS; 83 } 84 printf("Test FAILED\n"); 85 return PTS_FAIL; 86 } 87
