1 /* 2 * Copyright (c) 2002, Intel Corporation. All rights reserved. 3 * Copyright (c) 2012, Cyril Hrubis <chrubis (at) suse.cz> 4 * 5 * This file is licensed under the GPL license. For the full content 6 * of this license, see the COPYING file at the top level of this 7 * source tree. 8 * 9 * The mapping established by mmap() shall replace any previous 10 * mappings for those whole pages containing any part of the address 11 * space of the process starting at pa and continuing for len bytes. 12 * 13 * Test Steps: 14 * 1. Set the size of the file to be mapped as (2 * _SC_PAGE_SIZE); 15 * 2. Map size = (_SC_PAGE_SIZE + 2) bytes into memory, 16 * setting the content as 'a'. The mapped address is pa. 17 * 2. Map size2 = (_SC_PAGE_SIZE + 1) bytes into memory, starting at the same 18 * address as the first mmap, i.e. pa, using MAP_FIXED flag. 19 * Setting the cotent as 'b' 20 * 3. Test whether byte *(pa + size) is 'b'. 21 */ 22 23 #define _XOPEN_SOURCE 600 24 #include <stdio.h> 25 #include <stdlib.h> 26 #include <unistd.h> 27 #include <sys/mman.h> 28 #include <sys/types.h> 29 #include <sys/stat.h> 30 #include <fcntl.h> 31 #include <string.h> 32 #include <errno.h> 33 #include "posixtest.h" 34 35 #ifdef MAP_FIXED 36 int main(void) 37 { 38 char tmpfname[256]; 39 char tmpfname2[256]; 40 char *data; 41 long total_size; 42 long page_size; 43 44 void *pa; 45 size_t size; 46 int fd; 47 48 void *pa2; 49 size_t size2; 50 int fd2; 51 52 char *ch; 53 54 page_size = sysconf(_SC_PAGE_SIZE); 55 size = page_size + 2; 56 size2 = page_size + 1; 57 58 /* Size of the file */ 59 total_size = 2 * page_size; 60 61 snprintf(tmpfname, sizeof(tmpfname), "/tmp/pts_mmap_3_1_%d_1", 62 getpid()); 63 snprintf(tmpfname2, sizeof(tmpfname2), "/tmp/pts_mmap_3_1_%d_2", 64 getpid()); 65 66 unlink(tmpfname); 67 unlink(tmpfname2); 68 69 fd = open(tmpfname, O_CREAT | O_RDWR | O_EXCL, S_IRUSR | S_IWUSR); 70 fd2 = open(tmpfname2, O_CREAT | O_RDWR | O_EXCL, S_IRUSR | S_IWUSR); 71 if (fd == -1 || fd2 == -1) { 72 printf("Error at open(): %s\n", strerror(errno)); 73 return PTS_UNRESOLVED; 74 } 75 76 unlink(tmpfname); 77 unlink(tmpfname2); 78 79 data = malloc(total_size); 80 81 memset(data, 'a', total_size); 82 if (write(fd, data, total_size) != total_size) { 83 printf("Error at write(), fd: %s\n", strerror(errno)); 84 return PTS_UNRESOLVED; 85 } 86 87 memset(data, 'b', total_size); 88 if (write(fd2, data, total_size) != total_size) { 89 printf("Error at write(), fd1: %s\n", strerror(errno)); 90 return PTS_UNRESOLVED; 91 } 92 93 free(data); 94 95 /* Map first file */ 96 pa = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); 97 if (pa == MAP_FAILED) { 98 printf("Error at mmap: %s\n", strerror(errno)); 99 return PTS_FAIL; 100 } 101 102 ch = pa + size; 103 if (*ch != 'a') { 104 printf("Test Fail: The file is not mapped correctly\n"); 105 return PTS_FAIL; 106 } 107 108 /* Replace orginal mapping */ 109 pa2 = 110 mmap(pa, size2, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED, fd2, 111 0); 112 if (pa2 == MAP_FAILED) { 113 printf("Error at 2nd mmap: %s\n", strerror(errno)); 114 return PTS_FAIL; 115 } 116 117 if (pa2 != pa) { 118 printf("Error at mmap, the second mmap does not replaced the" 119 " first mapping\n"); 120 return PTS_FAIL; 121 } 122 123 ch = pa2 + size; 124 if (*ch != 'b') { 125 printf("The original mapped page has not been replaced\n"); 126 return PTS_FAIL; 127 } 128 129 close(fd); 130 close(fd2); 131 munmap(pa, size); 132 munmap(pa2, size2); 133 printf("Test PASSED\n"); 134 return PTS_PASS; 135 } 136 #else 137 int main(void) 138 { 139 printf("MAP_FIXED was not defined at the time of compilation\n"); 140 return PTS_UNRESOLVED; 141 } 142 #endif /* MAP_FIXED */ 143
