Annotation of src/tests/kernel/t_lockf.c, Revision 1.9
1.9 ! christos 1: /* $NetBSD: t_lockf.c,v 1.8 2013/02/20 02:22:48 pgoyette Exp $ */
1.1 pgoyette 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:
1.5 pgoyette 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 */
1.1 pgoyette 61:
62: const char *lockfile = "lockf_test";
63:
64: static u_int32_t
65: random_uint32(void)
66: {
67: return lrand48();
68: }
69:
70: static void
71: trylocks(int id)
72: {
1.9 ! christos 73: int i, fd;
1.1 pgoyette 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:
1.5 pgoyette 84: for (i = 0; i < nlocks; i++) {
1.1 pgoyette 85: struct flock fl;
86:
1.5 pgoyette 87: fl.l_start = random_uint32() % filesize;
88: fl.l_len = random_uint32() % filesize;
1.1 pgoyette 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:
1.9 ! christos 102: (void)fcntl(fd, F_SETLKW, &fl);
1.1 pgoyette 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);
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:
119: ATF_TC_BODY(randlock, tc)
120: {
121: int i, j, fd;
1.6 pgoyette 122: int pipe_fd[2];
1.1 pgoyette 123: pid_t *pid;
124: int status;
1.6 pgoyette 125: char pipe_in, pipe_out;
1.8 pgoyette 126: const char pipe_errmsg[] = "child: pipe write failed\n";
1.1 pgoyette 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:
1.5 pgoyette 133: ATF_REQUIRE_MSG(ftruncate(fd, filesize) >= 0,
1.1 pgoyette 134: "ftruncate(%s): %s", lockfile, strerror(errno));
135:
1.6 pgoyette 136: ATF_REQUIRE_MSG(pipe(pipe_fd) == 0, "pipe: %s", strerror(errno));
137:
1.1 pgoyette 138: fsync(fd);
139: close(fd);
140:
141: pid = malloc(nprocs * sizeof(pid_t));
142:
1.5 pgoyette 143: for (i = 0; i < nprocs; i++) {
1.6 pgoyette 144: pipe_out = (char)('A' + i);
1.1 pgoyette 145: pid[i] = fork();
146: switch (pid[i]) {
147: case 0:
1.6 pgoyette 148: if (write(pipe_fd[1], &pipe_out, 1) != 1)
1.7 pgoyette 149: write(STDERR_FILENO, pipe_errmsg,
1.8 pgoyette 150: __arraycount(pipe_errmsg) - 1);
1.6 pgoyette 151: else
152: trylocks(i);
1.1 pgoyette 153: _exit(0);
154: break;
155: case -1:
156: atf_tc_fail("fork %d failed", i);
157: break;
158: default:
1.6 pgoyette 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");
1.1 pgoyette 163: break;
164: }
165: }
1.4 pgoyette 166: for (j = 0; j < npasses; j++) {
1.1 pgoyette 167: printf("parent: run %i\n", j+1);
1.5 pgoyette 168: for (i = 0; i < nprocs; i++) {
1.1 pgoyette 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)");
1.5 pgoyette 173: usleep(sleeptime / 3);
1.1 pgoyette 174: ATF_REQUIRE_MSG(ptrace(PT_DETACH, pid[i], (caddr_t)1,
175: 0) >= 0,
176: "ptrace detach %d", pid[i]);
1.5 pgoyette 177: usleep(sleeptime / 3);
1.1 pgoyette 178: }
179: }
1.5 pgoyette 180: for (i = 0; i < nprocs; i++) {
1.1 pgoyette 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
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);
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:
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:
1.5 pgoyette 228: ATF_REQUIRE_MSG(ftruncate(fd, filesize) >= 0,
1.1 pgoyette 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);
1.2 pgoyette 248: ATF_REQUIRE_MSG(error == EDEADLK, "parent did not detect deadlock: %s",
1.1 pgoyette 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:
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: }
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