1 /*
2 * Copyright (c) 2002, Intel Corporation. All rights reserved.
3 * Copyright (c) 2012, Cyril Hrubis <chrubis@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
main(void)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
main(void)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