1/* 2 * Copyright (c) 2002, Intel Corporation. All rights reserved. 3 * This file is licensed under the GPL license. For the full content 4 * of this license, see the COPYING file at the top level of this 5 * source tree. 6 * 7 * The mmap( ) function shall add an extra reference to the file 8 * associated with the file descriptor fildes which is not removed 9 * by a subsequent close( ) on that file descriptor. 10 * This reference shall be removed when there are no more 11 * mappings to the file. 12 * 13 * Test Steps: 14 * 1. Create a file, while it is open call unlink(). 15 * 2. mmap the file to memory, then call close(). If mmap() add 16 * extra reference to the file, the file descriptor will not be removed. 17 * 3. Try to open the file, open should success; 18 * 3. munmap the mapped memory; 19 * 4. Try open the file again, should get ENOENT; 20 */ 21 22#define _XOPEN_SOURCE 600 23 24#include <pthread.h> 25#include <stdio.h> 26#include <stdlib.h> 27#include <unistd.h> 28#include <sys/mman.h> 29#include <sys/types.h> 30#include <sys/stat.h> 31#include <sys/wait.h> 32#include <fcntl.h> 33#include <string.h> 34#include <errno.h> 35#include "posixtest.h" 36 37#define TNAME "mmap/12-1.c" 38 39int main() 40{ 41 char tmpfname[256]; 42 long total_size; 43 44 void *pa = NULL; 45 void *addr = NULL; 46 size_t size; 47 int flag; 48 int fd, fd2; 49 off_t off = 0; 50 int prot; 51 52 total_size = 1024; 53 size = total_size; 54 55 snprintf(tmpfname, sizeof(tmpfname), "/tmp/pts_mmap_12_1_%ld", 56 (long)getpid()); 57 unlink(tmpfname); 58 fd = open(tmpfname, O_CREAT | O_RDWR | O_EXCL, 59 S_IRUSR | S_IWUSR); 60 if (fd == -1) 61 { 62 printf(TNAME " Error at open(): %s\n", 63 strerror(errno)); 64 exit(PTS_UNRESOLVED); 65 } 66 67 /* If there is no reference to the file, 68 * this file will be removed 69 */ 70 unlink(tmpfname); 71 72 if (ftruncate(fd, total_size) == -1) 73 { 74 printf(TNAME "Error at ftruncate(): %s\n", 75 strerror(errno)); 76 exit(PTS_UNRESOLVED); 77 } 78 79 flag = MAP_SHARED; 80 prot = PROT_READ | PROT_WRITE; 81 82 pa = mmap(addr, size, prot, flag, fd, off); 83 if (pa == MAP_FAILED) 84 { 85 printf ("Test Fail: " TNAME " Error at mmap: %s\n", 86 strerror(errno)); 87 exit(PTS_FAIL); 88 } 89 90 close(fd); 91 92 /* File still exists */ 93 94 fd2 = open(tmpfname, O_RDWR, S_IRUSR | S_IWUSR); 95 if (fd == -1 && errno == ENOENT) 96 { 97 printf(TNAME " Error at open(): %s\n", 98 strerror(errno)); 99 printf ("Test Fail: " TNAME " The file is removed. mmap does not " 100 "add extra reference to the file associated with fd\n"); 101 exit(PTS_FAIL); 102 } 103 104 munmap (pa, size); 105 106 /* The file should have been removed */ 107 fd2 = open(tmpfname, O_RDWR, S_IRUSR | S_IWUSR); 108 if (fd2 == -1 && errno == ENOENT) 109 { 110 printf ("Test PASS: " TNAME " The file is removed. munmap removed " 111 "reference to the file associated with fd\n"); 112 exit(PTS_PASS); 113 } 114 115 if (fd2 != -1) 116 { 117 printf ("Test FAIL: " TNAME 118 " The file is not removed. munmap does not remove " 119 "reference to the file associated with fd\n"); 120 return PTS_FAIL; 121 } 122 123 printf("PTS_UNRESLOVED " TNAME " Error at open(): %s\n", 124 strerror(errno)); 125 return PTS_UNRESOLVED; 126} 127