1 /* $NetBSD: t_msync.c,v 1.2 2012/03/16 06:15:17 matt Exp $ */
2
3 /*-
4 * Copyright (c) 2011 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jukka Ruohonen.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31 #include <sys/cdefs.h>
32 __RCSID("$NetBSD: t_msync.c,v 1.2 2012/03/16 06:15:17 matt Exp $");
33
34 #include <sys/mman.h>
35
36 #include <atf-c.h>
37 #include <errno.h>
38 #include <fcntl.h>
39 #include <limits.h>
40 #include <stdlib.h>
41 #include <string.h>
42 #include <unistd.h>
43
44 static long page = 0;
45 static const off_t off = 512;
46 static const char path[] = "msync";
47
48 static const char *msync_sync(const char *, int);
49
50 static const char *
msync_sync(const char * garbage,int flags)51 msync_sync(const char *garbage, int flags)
52 {
53 char *buf, *map = MAP_FAILED;
54 const char *str = NULL;
55 size_t i, len;
56 ssize_t tot;
57 int fd, rv;
58
59 /*
60 * Create a temporary file, write
61 * one page to it, and map the file.
62 */
63 buf = malloc(page);
64
65 if (buf == NULL)
66 return NULL;
67
68 for (i = 0; i < (size_t)page; i++)
69 buf[i] = 'x';
70
71 fd = open(path, O_RDWR | O_CREAT, 0700);
72
73 if (fd < 0) {
74 str = "failed to open";
75 goto out;
76 }
77
78 tot = 0;
79
80 while (tot < page) {
81
82 rv = write(fd, buf, sizeof(buf));
83
84 if (rv < 0) {
85 str = "failed to write";
86 goto out;
87 }
88
89 tot += rv;
90 }
91
92 map = mmap(NULL, page, PROT_READ | PROT_WRITE, MAP_FILE|MAP_PRIVATE,
93 fd, 0);
94
95 if (map == MAP_FAILED) {
96 str = "failed to map";
97 goto out;
98 }
99
100 /*
101 * Seek to an arbitrary offset and
102 * write garbage to this position.
103 */
104 if (lseek(fd, off, SEEK_SET) != off) {
105 str = "failed to seek";
106 goto out;
107 }
108
109 len = strlen(garbage);
110 rv = write(fd, garbage, len);
111
112 if (rv != (ssize_t)len) {
113 str = "failed to write garbage";
114 goto out;
115 }
116
117 /*
118 * Synchronize the mapping and verify
119 * that garbage is at the given offset.
120 */
121 if (msync(map, page, flags) != 0) {
122 str = "failed to msync";
123 goto out;
124 }
125
126 if (memcmp(map + off, garbage, len) != 0) {
127 str = "msync did not synchronize";
128 goto out;
129 }
130
131 out:
132 free(buf);
133
134 (void)close(fd);
135 (void)unlink(path);
136
137 if (map != MAP_FAILED)
138 (void)munmap(map, page);
139
140 return str;
141 }
142
143 ATF_TC(msync_async);
ATF_TC_HEAD(msync_async,tc)144 ATF_TC_HEAD(msync_async, tc)
145 {
146 atf_tc_set_md_var(tc, "descr", "Test of msync(2), MS_ASYNC");
147 }
148
ATF_TC_BODY(msync_async,tc)149 ATF_TC_BODY(msync_async, tc)
150 {
151 const char *str;
152
153 str = msync_sync("garbage", MS_ASYNC);
154
155 if (str != NULL)
156 atf_tc_fail("%s", str);
157 }
158
159 ATF_TC(msync_err);
ATF_TC_HEAD(msync_err,tc)160 ATF_TC_HEAD(msync_err, tc)
161 {
162 atf_tc_set_md_var(tc, "descr", "Test error conditions in msync(2)");
163 }
164
ATF_TC_BODY(msync_err,tc)165 ATF_TC_BODY(msync_err, tc)
166 {
167
168 char *map = MAP_FAILED;
169
170 /*
171 * Test that invalid flags error out.
172 */
173 ATF_REQUIRE(msync_sync("error", -1) != NULL);
174 ATF_REQUIRE(msync_sync("error", INT_MAX) != NULL);
175
176 errno = 0;
177
178 /*
179 * Map a page and then unmap to get an unmapped address.
180 */
181 map = mmap(NULL, page, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE,
182 -1, 0);
183 ATF_REQUIRE(map != MAP_FAILED);
184
185 (void)munmap(map, page);
186
187 ATF_REQUIRE(msync(map, page, MS_SYNC) != 0);
188 ATF_REQUIRE(errno == EFAULT);
189 }
190
191 ATF_TC(msync_invalidate);
ATF_TC_HEAD(msync_invalidate,tc)192 ATF_TC_HEAD(msync_invalidate, tc)
193 {
194 atf_tc_set_md_var(tc, "descr", "Test of msync(2), MS_INVALIDATE");
195 }
196
ATF_TC_BODY(msync_invalidate,tc)197 ATF_TC_BODY(msync_invalidate, tc)
198 {
199 const char *str;
200
201 str = msync_sync("garbage", MS_INVALIDATE);
202
203 if (str != NULL)
204 atf_tc_fail("%s", str);
205 }
206
207 ATF_TC(msync_sync);
ATF_TC_HEAD(msync_sync,tc)208 ATF_TC_HEAD(msync_sync, tc)
209 {
210 atf_tc_set_md_var(tc, "descr", "Test of msync(2), MS_SYNC");
211 }
212
ATF_TC_BODY(msync_sync,tc)213 ATF_TC_BODY(msync_sync, tc)
214 {
215 const char *str;
216
217 str = msync_sync("garbage", MS_SYNC);
218
219 if (str != NULL)
220 atf_tc_fail("%s", str);
221 }
222
ATF_TP_ADD_TCS(tp)223 ATF_TP_ADD_TCS(tp)
224 {
225
226 page = sysconf(_SC_PAGESIZE);
227
228 ATF_REQUIRE(page >= 0);
229 ATF_REQUIRE(page > off);
230
231 ATF_TP_ADD_TC(tp, msync_async);
232 ATF_TP_ADD_TC(tp, msync_err);
233 ATF_TP_ADD_TC(tp, msync_invalidate);
234 ATF_TP_ADD_TC(tp, msync_sync);
235
236 return atf_no_error();
237 }
238