t_mincore.c revision 1.5 
1/* $NetBSD: t_mincore.c,v 1.5 2012/05/23 16:08:32 martin 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
32/*-
33 * Copyright (c) 1999 The NetBSD Foundation, Inc.
34 * All rights reserved.
35 *
36 * This code is derived from software contributed to The NetBSD Foundation
37 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
38 * NASA Ames Research Center.
39 *
40 * Redistribution and use in source and binary forms, with or without
41 * modification, are permitted provided that the following conditions
42 * are met:
43 * 1. Redistributions of source code must retain the above copyright
44 *    notice, this list of conditions and the following disclaimer.
45 * 2. Redistributions in binary form must reproduce the above copyright
46 *    notice, this list of conditions and the following disclaimer in the
47 *    documentation and/or other materials provided with the distribution.
48 *
49 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
50 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
51 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
52 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
53 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
54 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
55 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
56 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
57 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
58 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
59 * POSSIBILITY OF SUCH DAMAGE.
60 */
61#include <sys/cdefs.h>
62__RCSID("$NetBSD: t_mincore.c,v 1.5 2012/05/23 16:08:32 martin Exp $");
63
64#include <sys/mman.h>
65#include <sys/shm.h>
66
67#include <atf-c.h>
68#include <errno.h>
69#include <fcntl.h>
70#include <stdio.h>
71#include <stdlib.h>
72#include <string.h>
73#include <unistd.h>
74
75static long		page = 0;
76static const char	path[] = "mincore";
77static size_t		check_residency(void *, size_t);
78
79static size_t
80check_residency(void *addr, size_t npgs)
81{
82	size_t i, resident;
83	char *vec;
84
85	vec = malloc(npgs);
86
87	ATF_REQUIRE(vec != NULL);
88	ATF_REQUIRE(mincore(addr, npgs * page, vec) == 0);
89
90	for (i = resident = 0; i < npgs; i++) {
91
92		if (vec[i] != 0)
93			resident++;
94
95		(void)fprintf(stderr, "page 0x%p is %sresident\n",
96		    (char *)addr + (i * page), vec[i] ? "" : "not ");
97	}
98
99	free(vec);
100
101	return resident;
102}
103
104ATF_TC(mincore_err);
105ATF_TC_HEAD(mincore_err, tc)
106{
107	atf_tc_set_md_var(tc, "descr", "Test errors from mincore(2)");
108}
109
110ATF_TC_BODY(mincore_err, tc)
111{
112	char *map, *vec;
113
114	map = mmap(NULL, page, PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0);
115	vec = malloc(page);
116
117	ATF_REQUIRE(vec != NULL);
118	ATF_REQUIRE(map != MAP_FAILED);
119
120	errno = 0;
121	ATF_REQUIRE_ERRNO(EINVAL, mincore(map, 0, vec) == -1);
122
123	errno = 0;
124	ATF_REQUIRE_ERRNO(ENOMEM, mincore(0, page, vec) == -1);
125
126	errno = 0;
127	ATF_REQUIRE_ERRNO(EFAULT, mincore(map, page, (void *)-1) == -1);
128
129	free(vec);
130	ATF_REQUIRE(munmap(map, page) == 0);
131}
132
133ATF_TC_WITH_CLEANUP(mincore_resid);
134ATF_TC_HEAD(mincore_resid, tc)
135{
136	atf_tc_set_md_var(tc, "descr", "Test page residency with mincore(2)");
137}
138
139ATF_TC_BODY(mincore_resid, tc)
140{
141	void *addr, *addr2, *addr3, *buf;
142	size_t npgs = 0;
143	struct stat st;
144	int fd, rv;
145
146	(void)memset(&st, 0, sizeof(struct stat));
147
148	fd = open(path, O_RDWR | O_CREAT, 0700);
149	buf = malloc(page * 5);
150
151	ATF_REQUIRE(fd >= 0);
152	ATF_REQUIRE(buf != NULL);
153
154	rv = write(fd, buf, page * 5);
155	ATF_REQUIRE(rv >= 0);
156
157	ATF_REQUIRE(fd >= 0);
158	ATF_REQUIRE(fstat(fd, &st) == 0);
159
160	addr = mmap(NULL, (size_t)st.st_size, PROT_READ,
161	    MAP_FILE | MAP_SHARED, fd, (off_t) 0);
162
163	ATF_REQUIRE(addr != MAP_FAILED);
164
165	(void)close(fd);
166
167	npgs = st.st_size / page;
168
169	if (st.st_size % page != 0)
170		npgs++;
171
172	(void)check_residency(addr, npgs);
173
174	ATF_REQUIRE(mlock(addr, npgs * page) == 0);
175	ATF_REQUIRE(munmap(addr, st.st_size) == 0);
176
177	npgs = 128;
178
179	addr = mmap(NULL, npgs * page, PROT_READ | PROT_WRITE,
180	    MAP_ANON | MAP_PRIVATE | MAP_WIRED, -1, (off_t)0);
181
182	if (addr == MAP_FAILED)
183		return;
184
185	ATF_REQUIRE(check_residency(addr, npgs) == npgs);
186	ATF_REQUIRE(munmap(addr, npgs * page) == 0);
187
188	npgs = 128;
189
190	addr = mmap(NULL, npgs * page, PROT_READ | PROT_WRITE,
191	    MAP_ANON | MAP_PRIVATE, -1, (off_t)0);
192
193	if (addr == MAP_FAILED)
194		return;
195
196	/*
197	 * Check that the in-core pages match the locked pages.
198	 */
199	ATF_REQUIRE(check_residency(addr, npgs) == 0);
200
201	errno = 0;
202
203	if (mlockall(MCL_CURRENT|MCL_FUTURE) != 0 && errno != ENOMEM)
204		atf_tc_fail("mlockall(2) failed");
205
206	ATF_REQUIRE(check_residency(addr, npgs) == npgs);
207
208	addr2 = mmap(NULL, npgs * page, PROT_READ, MAP_ANON, -1, (off_t)0);
209	addr3 = mmap(NULL, npgs * page, PROT_NONE, MAP_ANON, -1, (off_t)0);
210
211	if (addr2 == MAP_FAILED || addr3 == MAP_FAILED)
212		return;
213
214	ATF_REQUIRE(check_residency(addr2, npgs) == npgs);
215	ATF_REQUIRE(check_residency(addr3, npgs) == 0);
216	ATF_REQUIRE(mprotect(addr3, npgs * page, PROT_READ) == 0);
217	ATF_REQUIRE(check_residency(addr, npgs) == npgs);
218	ATF_REQUIRE(check_residency(addr2, npgs) == npgs);
219
220	(void)munlockall();
221
222	ATF_REQUIRE(madvise(addr2, npgs * page, MADV_FREE) == 0);
223	ATF_REQUIRE(check_residency(addr2, npgs) == 0);
224
225	(void)memset(addr, 0, npgs * page);
226
227	ATF_REQUIRE(madvise(addr, npgs * page, MADV_FREE) == 0);
228	ATF_REQUIRE(check_residency(addr, npgs) == 0);
229
230	(void)munmap(addr, npgs * page);
231	(void)munmap(addr2, npgs * page);
232	(void)munmap(addr3, npgs * page);
233	(void)unlink(path);
234}
235
236ATF_TC_CLEANUP(mincore_resid, tc)
237{
238	(void)unlink(path);
239}
240
241ATF_TC(mincore_shmseg);
242ATF_TC_HEAD(mincore_shmseg, tc)
243{
244	atf_tc_set_md_var(tc, "descr", "residency of shared memory");
245}
246
247ATF_TC_BODY(mincore_shmseg, tc)
248{
249	size_t npgs = 128;
250	void *addr = NULL;
251	int shmid;
252
253	shmid = shmget(IPC_PRIVATE, npgs * page,
254	    IPC_CREAT | S_IRUSR | S_IWUSR);
255
256	ATF_REQUIRE(shmid != -1);
257
258	addr = shmat(shmid, NULL, 0);
259
260	ATF_REQUIRE(addr != NULL);
261	ATF_REQUIRE(check_residency(addr, npgs) == 0);
262
263	(void)memset(addr, 0xff, npgs * page);
264
265	ATF_REQUIRE(check_residency(addr, npgs) == npgs);
266	ATF_REQUIRE(madvise(addr, npgs * page, MADV_FREE) == 0);
267
268	/*
269	 * NOTE!  Even though we have MADV_FREE'd the range,
270	 * there is another reference (the kernel's) to the
271	 * object which owns the pages.  In this case, the
272	 * kernel does not simply free the pages, as haphazardly
273	 * freeing pages when there are still references to
274	 * an object can cause data corruption (say, the other
275	 * referencer doesn't expect the pages to be freed,
276	 * and is surprised by the subsequent ZFOD).
277	 *
278	 * Because of this, we simply report the number of
279	 * pages still resident, for information only.
280	 */
281	npgs = check_residency(addr, npgs);
282
283	(void)fprintf(stderr, "%zu pages still resident\n", npgs);
284
285	ATF_REQUIRE(shmdt(addr) == 0);
286	ATF_REQUIRE(shmctl(shmid, IPC_RMID, NULL) == 0);
287}
288
289ATF_TP_ADD_TCS(tp)
290{
291
292	page = sysconf(_SC_PAGESIZE);
293	ATF_REQUIRE(page >= 0);
294
295	ATF_TP_ADD_TC(tp, mincore_err);
296	ATF_TP_ADD_TC(tp, mincore_resid);
297	ATF_TP_ADD_TC(tp, mincore_shmseg);
298
299	return atf_no_error();
300}
301