1 /* $NetBSD: t_lockf.c,v 1.9 2013/10/19 17:45:00 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2000 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include <atf-c.h>
30 #include <err.h>
31 #include <errno.h>
32 #include <fcntl.h>
33 #include <signal.h>
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <string.h>
37 #include <unistd.h>
38
39 #include <sys/types.h>
40 #include <sys/wait.h>
41 #include <sys/ptrace.h>
42
43 /*
44 * lockf1 regression test:
45 *
46 * Tests:
47 * Fork N child processes, each of which gets M random byte range locks
48 * on a common file. We ignore all lock errors (practically speaking,
49 * this means EDEADLK or ENOLOCK), but we make numerous passes over all
50 * the children to make sure that they are still awake. (We do this by
51 * verifying that we can ptrace(ATTACH/DETACH) to the children and get
52 * their status via waitpid().)
53 * When finished, reap all the children.
54 */
55
56 #define nlocks 500 /* number of locks per thread */
57 #define nprocs 10 /* number of processes to spawn */
58 #define npasses 50 /* number of passes to make over the children */
59 #define sleeptime 150000 /* sleep time between locks, usec */
60 #define filesize 8192 /* size of file to lock */
61
62 const char *lockfile = "lockf_test";
63
64 static u_int32_t
random_uint32(void)65 random_uint32(void)
66 {
67 return lrand48();
68 }
69
70 static void
trylocks(int id)71 trylocks(int id)
72 {
73 int i, fd;
74
75 srand48(getpid());
76
77 fd = open (lockfile, O_RDWR, 0);
78
79 if (fd < 0)
80 err(1, "%s", lockfile);
81
82 printf("%d: start\n", id);
83
84 for (i = 0; i < nlocks; i++) {
85 struct flock fl;
86
87 fl.l_start = random_uint32() % filesize;
88 fl.l_len = random_uint32() % filesize;
89 switch (random_uint32() % 3) {
90 case 0:
91 fl.l_type = F_RDLCK;
92 break;
93 case 1:
94 fl.l_type = F_WRLCK;
95 break;
96 case 2:
97 fl.l_type = F_UNLCK;
98 break;
99 }
100 fl.l_whence = SEEK_SET;
101
102 (void)fcntl(fd, F_SETLKW, &fl);
103
104 if (usleep(sleeptime) < 0)
105 err(1, "usleep");
106 }
107 printf("%d: done\n", id);
108 close (fd);
109 }
110
111 ATF_TC(randlock);
ATF_TC_HEAD(randlock,tc)112 ATF_TC_HEAD(randlock, tc)
113 {
114
115 atf_tc_set_md_var(tc, "timeout", "300");
116 atf_tc_set_md_var(tc, "descr", "Checks fcntl(2) locking");
117 }
118
ATF_TC_BODY(randlock,tc)119 ATF_TC_BODY(randlock, tc)
120 {
121 int i, j, fd;
122 int pipe_fd[2];
123 pid_t *pid;
124 int status;
125 char pipe_in, pipe_out;
126 const char pipe_errmsg[] = "child: pipe write failed\n";
127
128 (void)unlink(lockfile);
129
130 fd = open (lockfile, O_RDWR|O_CREAT|O_EXCL|O_TRUNC, 0666);
131 ATF_REQUIRE_MSG(fd >= 0, "open(%s): %s", lockfile, strerror(errno));
132
133 ATF_REQUIRE_MSG(ftruncate(fd, filesize) >= 0,
134 "ftruncate(%s): %s", lockfile, strerror(errno));
135
136 ATF_REQUIRE_MSG(pipe(pipe_fd) == 0, "pipe: %s", strerror(errno));
137
138 fsync(fd);
139 close(fd);
140
141 pid = malloc(nprocs * sizeof(pid_t));
142
143 for (i = 0; i < nprocs; i++) {
144 pipe_out = (char)('A' + i);
145 pid[i] = fork();
146 switch (pid[i]) {
147 case 0:
148 if (write(pipe_fd[1], &pipe_out, 1) != 1)
149 write(STDERR_FILENO, pipe_errmsg,
150 __arraycount(pipe_errmsg) - 1);
151 else
152 trylocks(i);
153 _exit(0);
154 break;
155 case -1:
156 atf_tc_fail("fork %d failed", i);
157 break;
158 default:
159 ATF_REQUIRE_MSG(read(pipe_fd[0], &pipe_in, 1) == 1,
160 "parent: read_pipe(%i): %s", i, strerror(errno));
161 ATF_REQUIRE_MSG(pipe_in == pipe_out,
162 "parent: pipe does not match");
163 break;
164 }
165 }
166 for (j = 0; j < npasses; j++) {
167 printf("parent: run %i\n", j+1);
168 for (i = 0; i < nprocs; i++) {
169 ATF_REQUIRE_MSG(ptrace(PT_ATTACH, pid[i], 0, 0) >= 0,
170 "ptrace attach %d", pid[i]);
171 ATF_REQUIRE_MSG(waitpid(pid[i], &status, WUNTRACED) >= 0,
172 "waitpid(ptrace)");
173 usleep(sleeptime / 3);
174 ATF_REQUIRE_MSG(ptrace(PT_DETACH, pid[i], (caddr_t)1,
175 0) >= 0,
176 "ptrace detach %d", pid[i]);
177 usleep(sleeptime / 3);
178 }
179 }
180 for (i = 0; i < nprocs; i++) {
181 printf("reap %d: ", i);
182 fflush(stdout);
183 kill(pid[i], SIGINT);
184 waitpid(pid[i], &status, 0);
185 printf(" status %d\n", status);
186 }
187 atf_tc_pass();
188 }
189
190 static int
dolock(int fd,int op,off_t lk_off,off_t lk_size)191 dolock(int fd, int op, off_t lk_off, off_t lk_size)
192 {
193 off_t result;
194 int ret;
195
196 result = lseek(fd, lk_off, SEEK_SET);
197 if (result == -1) {
198 return errno;
199 }
200 ATF_REQUIRE_MSG(result == lk_off, "lseek to wrong offset");
201 ret = lockf(fd, op, lk_size);
202 if (ret == -1) {
203 return errno;
204 }
205 return 0;
206 }
207
208 ATF_TC(deadlock);
ATF_TC_HEAD(deadlock,tc)209 ATF_TC_HEAD(deadlock, tc)
210 {
211
212 atf_tc_set_md_var(tc, "timeout", "30");
213 atf_tc_set_md_var(tc, "descr", "Checks fcntl(2) deadlock detection");
214 }
215
ATF_TC_BODY(deadlock,tc)216 ATF_TC_BODY(deadlock, tc)
217 {
218 int fd;
219 int error;
220 int ret;
221 pid_t pid;
222
223 (void)unlink(lockfile);
224
225 fd = open (lockfile, O_RDWR|O_CREAT|O_EXCL|O_TRUNC, 0666);
226 ATF_REQUIRE_MSG(fd >= 0, "open(%s): %s", lockfile, strerror(errno));
227
228 ATF_REQUIRE_MSG(ftruncate(fd, filesize) >= 0,
229 "ftruncate(%s): %s", lockfile, strerror(errno));
230
231 fsync(fd);
232
233 error = dolock(fd, F_LOCK, 0, 1);
234 ATF_REQUIRE_MSG(error == 0, "initial dolock: %s", strerror(errno));
235
236 pid = fork();
237 ATF_REQUIRE_MSG(pid != -1, "fork failed: %s", strerror(errno));
238 if (pid == 0) {
239 error = dolock(fd, F_LOCK, 1, 1);
240 ATF_REQUIRE_MSG(error == 0, "child dolock: %s",
241 strerror(errno));
242 dolock(fd, F_LOCK, 0, 1); /* will block */
243 atf_tc_fail("child did not block");
244 }
245 sleep(1); /* give child time to grab its lock then block */
246
247 error = dolock(fd, F_LOCK, 1, 1);
248 ATF_REQUIRE_MSG(error == EDEADLK, "parent did not detect deadlock: %s",
249 strerror(errno));
250 ret = kill(pid, SIGKILL);
251 ATF_REQUIRE_MSG(ret != -1, "failed to kill child: %s", strerror(errno));
252
253 atf_tc_pass();
254 }
255
ATF_TP_ADD_TCS(tp)256 ATF_TP_ADD_TCS(tp)
257 {
258 ATF_TP_ADD_TC(tp, randlock);
259 ATF_TP_ADD_TC(tp, deadlock);
260
261 return atf_no_error();
262 }
263