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 removal of the memory object contents is postponed until all 11 * open and map references to the shared memory object have been removed. 12 */ 13 14/* ftruncate was formerly an XOPEN extension. We define _XOPEN_SOURCE here to 15 avoid warning if the implementation does not program ftruncate as a base 16 interface */ 17#define _XOPEN_SOURCE 600 18 19#include <stdio.h> 20#include <sys/mman.h> 21#include <sys/stat.h> 22#include <unistd.h> 23#include <string.h> 24#include <fcntl.h> 25#include <errno.h> 26#include "posixtest.h" 27 28#define BUF_SIZE 8 29#define SHM_NAME "posixtest_3-1" 30 31int main(void) 32{ 33 int fd; 34 char *buf; 35 36 fd = shm_open(SHM_NAME, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR); 37 if (fd == -1) { 38 perror("An error occurs when calling shm_open()"); 39 return PTS_UNRESOLVED; 40 } 41 42 if (ftruncate(fd, BUF_SIZE) != 0) { 43 perror("An error occurs when calling ftruncate()"); 44 shm_unlink(SHM_NAME); 45 return PTS_UNRESOLVED; 46 } 47 48 if (shm_unlink(SHM_NAME) != 0) { 49 perror("An error occurs when calling shm_unlink()"); 50 return PTS_UNRESOLVED; 51 } 52 /* Now, SHM_NAME is unlinked but there are open references on it */ 53 54 buf = mmap(NULL, BUF_SIZE, PROT_READ, MAP_SHARED, fd, 0); 55 if (buf == MAP_FAILED && errno == EBADF) { 56 printf("The shared memory object was removed.\n"); 57 return PTS_FAIL; 58 } else if (buf == MAP_FAILED) { 59 perror("An error occurs when calling mmap()"); 60 return PTS_UNRESOLVED; 61 } 62 63 printf("Test PASSED\n"); 64 return PTS_PASS; 65 66} 67