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 when name begins with the slash character, then processes calling 11 * shm_open() with the same value of name refer to the same shared memory 12 * object, as long as that name has not been removed. 13 * 14 * Steps: 15 * 1. Create a child process. 16 * (The child process) 17 * 2. Open a shared memory file O_RDWR with a name beginning with slash. 18 * 3. Write a string in the file. 19 * (The father) 20 * 2. Open a shared memory file O_RDONLY with the same name. 21 * 3. Read into the file. 22 * 4. Check that it obtain the right string. 23 */ 24 25/* ftruncate was formerly an XOPEN extension. We define _XOPEN_SOURCE here to 26 avoid warning if the implementation does not program ftruncate as a base 27 interface */ 28#define _XOPEN_SOURCE 600 29 30#include <stdio.h> 31#include <sys/mman.h> 32#include <sys/stat.h> 33#include <sys/wait.h> 34#include <sys/types.h> 35#include <unistd.h> 36#include <stdlib.h> 37#include <string.h> 38#include <fcntl.h> 39#include <signal.h> 40#include "posixtest.h" 41 42#define BUF_SIZE 8 43#define SHM_NAME "/posixtest_5-1" 44 45char str[BUF_SIZE] = "qwerty"; 46 47int child_process() 48{ 49 int fd; 50 char *buf; 51 52 fd = shm_open(SHM_NAME, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR); 53 if (fd == -1) { 54 perror("An error occurs when calling shm_open()"); 55 kill(getppid(), SIGUSR1); 56 return PTS_UNRESOLVED; 57 } 58 59 if (ftruncate(fd, BUF_SIZE) != 0) { 60 perror("An error occurs when calling ftruncate()"); 61 kill(getppid(), SIGUSR1); 62 return PTS_UNRESOLVED; 63 } 64 65 buf = mmap(NULL, BUF_SIZE, PROT_WRITE, MAP_SHARED, fd, 0); 66 if (buf == MAP_FAILED) { 67 perror("An error occurs when calling mmap()"); 68 kill(getppid(), SIGUSR1); 69 return PTS_UNRESOLVED; 70 } 71 72 strcpy(buf, str); 73 74 return PTS_PASS; 75} 76 77int main(void) 78{ 79 int fd, child_pid; 80 char *buf; 81 82 child_pid = fork(); 83 if (child_pid == -1) { 84 perror("An error occurs when calling fork()"); 85 return PTS_UNRESOLVED; 86 } else if (child_pid == 0) { 87 return child_process(); 88 } 89 90 wait(NULL); 91 92 fd = shm_open(SHM_NAME, O_RDONLY, S_IRUSR | S_IWUSR); 93 if (fd == -1) { 94 perror("An error occurs when calling shm_open()"); 95 return PTS_UNRESOLVED; 96 } 97 98 buf = mmap(NULL, BUF_SIZE, PROT_READ, MAP_SHARED, fd, 0); 99 if (buf == MAP_FAILED) { 100 perror("An error occurs when calling mmap()"); 101 return PTS_UNRESOLVED; 102 } 103 104 shm_unlink(SHM_NAME); 105 106 if (strcmp(buf, str) == 0) { 107 printf("Test PASSED\n"); 108 return PTS_PASS; 109 } 110 111 printf("Test FAILED\n"); 112 return PTS_FAIL; 113} 114