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 #include <stdio.h>
24 #include <stdlib.h>
25 #include <unistd.h>
26 #include <sys/mman.h>
27 #include <sys/types.h>
28 #include <sys/stat.h>
29 #include <fcntl.h>
30 #include <string.h>
31 #include <errno.h>
32 #include "posixtest.h"
33
34 #ifdef MAP_FIXED
main(void)35 int main(void)
36 {
37 char tmpfname[256];
38 char tmpfname2[256];
39 char *data;
40 long total_size;
41 long page_size;
42
43 void *pa;
44 size_t size;
45 int fd;
46
47 void *pa2;
48 size_t size2;
49 int fd2;
50
51 char *ch;
52
53 page_size = sysconf(_SC_PAGE_SIZE);
54 size = page_size + 2;
55 size2 = page_size + 1;
56
57 /* Size of the file */
58 total_size = 2 * page_size;
59
60 snprintf(tmpfname, sizeof(tmpfname), "/tmp/pts_mmap_3_1_%d_1",
61 getpid());
62 snprintf(tmpfname2, sizeof(tmpfname2), "/tmp/pts_mmap_3_1_%d_2",
63 getpid());
64
65 unlink(tmpfname);
66 unlink(tmpfname2);
67
68 fd = open(tmpfname, O_CREAT | O_RDWR | O_EXCL, S_IRUSR | S_IWUSR);
69 fd2 = open(tmpfname2, O_CREAT | O_RDWR | O_EXCL, S_IRUSR | S_IWUSR);
70 if (fd == -1 || fd2 == -1) {
71 printf("Error at open(): %s\n", strerror(errno));
72 return PTS_UNRESOLVED;
73 }
74
75 unlink(tmpfname);
76 unlink(tmpfname2);
77
78 data = malloc(total_size);
79
80 memset(data, 'a', total_size);
81 if (write(fd, data, total_size) != total_size) {
82 printf("Error at write(), fd: %s\n", strerror(errno));
83 return PTS_UNRESOLVED;
84 }
85
86 memset(data, 'b', total_size);
87 if (write(fd2, data, total_size) != total_size) {
88 printf("Error at write(), fd1: %s\n", strerror(errno));
89 return PTS_UNRESOLVED;
90 }
91
92 free(data);
93
94 /* Map first file */
95 pa = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
96 if (pa == MAP_FAILED) {
97 printf("Error at mmap: %s\n", strerror(errno));
98 return PTS_FAIL;
99 }
100
101 ch = pa + size;
102 if (*ch != 'a') {
103 printf("Test Fail: The file is not mapped correctly\n");
104 return PTS_FAIL;
105 }
106
107 /* Replace orginal mapping */
108 pa2 =
109 mmap(pa, size2, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED, fd2,
110 0);
111 if (pa2 == MAP_FAILED) {
112 printf("Error at 2nd mmap: %s\n", strerror(errno));
113 return PTS_FAIL;
114 }
115
116 if (pa2 != pa) {
117 printf("Error at mmap, the second mmap does not replaced the"
118 " first mapping\n");
119 return PTS_FAIL;
120 }
121
122 ch = pa2 + size;
123 if (*ch != 'b') {
124 printf("The original mapped page has not been replaced\n");
125 return PTS_FAIL;
126 }
127
128 close(fd);
129 close(fd2);
130 munmap(pa, size);
131 munmap(pa2, size2);
132 printf("Test PASSED\n");
133 return PTS_PASS;
134 }
135 #else
main(void)136 int main(void)
137 {
138 printf("MAP_FIXED was not defined at the time of compilation\n");
139 return PTS_UNRESOLVED;
140 }
141 #endif /* MAP_FIXED */
142