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 *
8 * If a mapping to be removed was private, any modifications
9 * made in this address range shall be discarded.
10 *
11 * Test Step:
12 * 1. mmap a file into memory. Set flag as MAP_PRIVATE;
13 * 2. Modify the mapped memory, and call msync to try to synchronize the change with
14 * the file;
15 * 3. munmap the mapped memory;
16 * 4. mmap the same file again into memory;
17 * 5. If the modification in step 2 appears in the mapped memory, then fail,
18 * otherwise pass.
19 */
20
21
22 #include <pthread.h>
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 <sys/wait.h>
30 #include <fcntl.h>
31 #include <string.h>
32 #include <errno.h>
33
34 #include "posixtest.h"
35 #include "tempfile.h"
36
37 #define TNAME "munmap/4-1.c"
38
main(void)39 int main(void)
40 {
41 int rc;
42
43 char tmpfname[PATH_MAX];
44 char *data;
45 int total_size = 1024;
46
47 void *pa = NULL;
48 void *addr = NULL;
49 size_t size = total_size;
50 int flag;
51 int fd;
52 off_t off = 0;
53 int prot;
54
55 char *ch;
56
57 PTS_GET_TMP_FILENAME(tmpfname, "pts_munmap_4_1");
58 unlink(tmpfname);
59 fd = open(tmpfname, O_CREAT | O_RDWR | O_EXCL, S_IRUSR | S_IWUSR);
60 if (fd == -1) {
61 printf(TNAME " Error at open(): %s\n", strerror(errno));
62 exit(PTS_UNRESOLVED);
63 }
64 unlink(tmpfname);
65
66 data = malloc(total_size);
67 memset(data, 'a', total_size);
68 if (write(fd, data, total_size) != total_size) {
69 printf(TNAME "Error at write(): %s\n", strerror(errno));
70 exit(PTS_UNRESOLVED);
71 }
72 free(data);
73
74 prot = PROT_READ | PROT_WRITE;
75 flag = MAP_PRIVATE;
76 pa = mmap(addr, size, prot, flag, fd, off);
77 if (pa == MAP_FAILED) {
78 printf("Test Fail: " TNAME " Error at mmap: %s\n",
79 strerror(errno));
80 exit(PTS_FAIL);
81 }
82
83 ch = pa;
84 *ch = 'b';
85
86 /* Flush changes back to the file */
87
88 if ((rc = msync(pa, size, MS_SYNC)) != 0) {
89 printf(TNAME " Error at msync(): %s\n", strerror(rc));
90 exit(PTS_UNRESOLVED);
91 }
92
93 munmap(pa, size);
94
95 /* Mmap again */
96
97 pa = mmap(addr, size, prot, flag, fd, off);
98 if (pa == MAP_FAILED) {
99 printf("Test Fail: " TNAME " Error at 2nd mmap: %s\n",
100 strerror(errno));
101 exit(PTS_FAIL);
102 }
103
104 ch = pa;
105 if (*ch == 'b') {
106 printf("Test FAIL\n");
107 exit(PTS_FAIL);
108 }
109
110 close(fd);
111 printf("Write referece is discarded when setting MAP_RPIVATE\n");
112 printf("Test PASSED\n");
113 return PTS_PASS;
114 }
115