t_msync.c revision 314817 
1/* $NetBSD: t_msync.c,v 1.3 2017/01/14 20:52:42 christos 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 1.3 2017/01/14 20:52:42 christos 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 len;
56	int fd, rv;
57
58	/*
59	 * Create a temporary file, write
60	 * one page to it, and map the file.
61	 */
62	buf = malloc(page);
63
64	if (buf == NULL)
65		return NULL;
66
67	memset(buf, 'x', page);
68
69	fd = open(path, O_RDWR | O_CREAT, 0700);
70
71	if (fd < 0) {
72		free(buf);
73		return "failed to open";
74	}
75
76	ATF_REQUIRE_MSG(write(fd, buf, page) != -1, "write(2) failed: %s",
77	    strerror(errno));
78
79	map = mmap(NULL, page, PROT_READ | PROT_WRITE, MAP_FILE|MAP_PRIVATE,
80	     fd, 0);
81
82	if (map == MAP_FAILED) {
83		str = "failed to map";
84		goto out;
85	}
86
87	/*
88	 * Seek to an arbitrary offset and
89	 * write garbage to this position.
90	 */
91	if (lseek(fd, off, SEEK_SET) != off) {
92		str = "failed to seek";
93		goto out;
94	}
95
96	len = strlen(garbage);
97	rv = write(fd, garbage, len);
98
99	if (rv != (ssize_t)len) {
100		str = "failed to write garbage";
101		goto out;
102	}
103
104	/*
105	 * Synchronize the mapping and verify
106	 * that garbage is at the given offset.
107	 */
108	if (msync(map, page, flags) != 0) {
109		str = "failed to msync";
110		goto out;
111	}
112
113	if (memcmp(map + off, garbage, len) != 0) {
114		str = "msync did not synchronize";
115		goto out;
116	}
117
118out:
119	free(buf);
120
121	(void)close(fd);
122	(void)unlink(path);
123
124	if (map != MAP_FAILED)
125		(void)munmap(map, page);
126
127	return str;
128}
129
130ATF_TC(msync_async);
131ATF_TC_HEAD(msync_async, tc)
132{
133	atf_tc_set_md_var(tc, "descr", "Test of msync(2), MS_ASYNC");
134}
135
136ATF_TC_BODY(msync_async, tc)
137{
138	const char *str;
139
140	str = msync_sync("garbage", MS_ASYNC);
141
142	if (str != NULL)
143		atf_tc_fail("%s", str);
144}
145
146ATF_TC(msync_err);
147ATF_TC_HEAD(msync_err, tc)
148{
149	atf_tc_set_md_var(tc, "descr", "Test error conditions in msync(2)");
150}
151
152ATF_TC_BODY(msync_err, tc)
153{
154
155	char *map = MAP_FAILED;
156
157	/*
158	 * Test that invalid flags error out.
159	 */
160#ifdef __FreeBSD__
161	errno = 0;
162	ATF_REQUIRE_ERRNO(EINVAL, msync_sync("error", -1) != NULL);
163	errno = 0;
164	ATF_REQUIRE_ERRNO(EINVAL, msync_sync("error", INT_MAX) != NULL);
165#else
166	ATF_REQUIRE(msync_sync("error", -1) != NULL);
167	ATF_REQUIRE(msync_sync("error", INT_MAX) != NULL);
168#endif
169
170	errno = 0;
171
172	/*
173	 * Map a page and then unmap to get an unmapped address.
174	 */
175	map = mmap(NULL, page, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE,
176	    -1, 0);
177	ATF_REQUIRE(map != MAP_FAILED);
178
179	(void)munmap(map, page);
180
181	ATF_REQUIRE(msync(map, page, MS_SYNC) != 0);
182#ifdef __FreeBSD__
183	ATF_REQUIRE(errno == ENOMEM);
184#else
185	ATF_REQUIRE(errno == EFAULT);
186#endif
187}
188
189ATF_TC(msync_invalidate);
190ATF_TC_HEAD(msync_invalidate, tc)
191{
192	atf_tc_set_md_var(tc, "descr", "Test of msync(2), MS_INVALIDATE");
193}
194
195ATF_TC_BODY(msync_invalidate, tc)
196{
197	const char *str;
198
199	str = msync_sync("garbage", MS_INVALIDATE);
200
201	if (str != NULL)
202		atf_tc_fail("%s", str);
203}
204
205ATF_TC(msync_sync);
206ATF_TC_HEAD(msync_sync, tc)
207{
208	atf_tc_set_md_var(tc, "descr", "Test of msync(2), MS_SYNC");
209}
210
211ATF_TC_BODY(msync_sync, tc)
212{
213	const char *str;
214
215	str = msync_sync("garbage", MS_SYNC);
216
217	if (str != NULL)
218		atf_tc_fail("%s", str);
219}
220
221ATF_TP_ADD_TCS(tp)
222{
223
224	page = sysconf(_SC_PAGESIZE);
225
226	ATF_REQUIRE(page >= 0);
227	ATF_REQUIRE(page > off);
228
229	ATF_TP_ADD_TC(tp, msync_async);
230	ATF_TP_ADD_TC(tp, msync_err);
231	ATF_TP_ADD_TC(tp, msync_invalidate);
232	ATF_TP_ADD_TC(tp, msync_sync);
233
234	return atf_no_error();
235}
236