t_msync.c revision 1.2 
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
44static long		page = 0;
45static const off_t	off = 512;
46static const char	path[] = "msync";
47
48static const char	*msync_sync(const char *, int);
49
50static const char *
51msync_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
131out:
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
143ATF_TC(msync_async);
144ATF_TC_HEAD(msync_async, tc)
145{
146	atf_tc_set_md_var(tc, "descr", "Test of msync(2), MS_ASYNC");
147}
148
149ATF_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
159ATF_TC(msync_err);
160ATF_TC_HEAD(msync_err, tc)
161{
162	atf_tc_set_md_var(tc, "descr", "Test error conditions in msync(2)");
163}
164
165ATF_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
191ATF_TC(msync_invalidate);
192ATF_TC_HEAD(msync_invalidate, tc)
193{
194	atf_tc_set_md_var(tc, "descr", "Test of msync(2), MS_INVALIDATE");
195}
196
197ATF_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
207ATF_TC(msync_sync);
208ATF_TC_HEAD(msync_sync, tc)
209{
210	atf_tc_set_md_var(tc, "descr", "Test of msync(2), MS_SYNC");
211}
212
213ATF_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
223ATF_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