1 /*-
2 * Copyright (c) 2008 Peter Holm <pho@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 */
27
28 /* Test lockf(3) */
29
30 #include <sys/param.h>
31 #include <sys/wait.h>
32
33 #include <err.h>
34 #include <errno.h>
35 #include <fcntl.h>
36 #include <signal.h>
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <unistd.h>
40
41 #include "stress.h"
42
43 static pid_t pid;
44 static int fd;
45 static int freespace;
46 static char file[128];
47
48 static int
get(void)49 get(void) {
50 int r, sem;
51
52 do {
53 r = lockf(fd, F_LOCK, 0);
54 } while (r == -1 && errno == EINTR && done_testing == 0);
55 if (r == -1)
56 err(1, "lockf(%s, F_LOCK)", file);
57 if (lseek(fd, 0, SEEK_SET) == -1) // XXX
58 err(1, "lseek"); // XXX
59 r = read(fd, &sem, sizeof(sem));
60 if (r == -1)
61 err(1, "get: read(%d)", fd);
62 if (r == 0)
63 errx(1, "get() read 0 bytes");
64 if (r != sizeof(sem))
65 errx(1, "get() size error: %d", r);
66 if (lseek(fd, 0, SEEK_SET) == -1)
67 err(1, "lseek");
68 if (lockf(fd, F_ULOCK, 0) == -1)
69 err(1, "lockf(%s, F_ULOCK)", file);
70 return (sem);
71 }
72
73 static void
incr(void)74 incr(void) {
75 int r, sem;
76
77 do {
78 r = lockf(fd, F_LOCK, 0);
79 } while (r == -1 && errno == EINTR && done_testing == 0);
80 if (r == -1)
81 err(1, "lockf(%s, F_LOCK)", file);
82 if (read(fd, &sem, sizeof(sem)) != sizeof(sem))
83 err(1, "incr: read(%d)", fd);
84 if (lseek(fd, 0, SEEK_SET) == -1)
85 err(1, "lseek");
86 sem++;
87 if (write(fd, &sem, sizeof(sem)) != sizeof(sem))
88 err(1, "incr: read");
89 if (lseek(fd, 0, SEEK_SET) == -1)
90 err(1, "lseek");
91 if (lockf(fd, F_ULOCK, 0) == -1)
92 err(1, "lockf(%s, F_ULOCK)", file);
93 }
94
95 int
setup(int nb)96 setup(int nb)
97 {
98 int64_t bl;
99 int64_t in;
100 int64_t reserve_bl;
101 int64_t reserve_in;
102
103 if (nb == 0) {
104 getdf(&bl, &in);
105
106 /* Resource requirements: */
107 reserve_in = 1 * op->incarnations;
108 reserve_bl = 4096 * op->incarnations;
109 freespace = (reserve_bl <= bl && reserve_in <= in);
110 if (!freespace)
111 reserve_bl = reserve_in = 0;
112
113 if (op->verbose > 1)
114 printf("lockf(incarnations=%d). Free(%jdk, %jd), reserve(%jdk, %jd)\n",
115 op->incarnations, bl/1024, in, reserve_bl/1024, reserve_in);
116 reservedf(reserve_bl, reserve_in);
117 putval(freespace);
118 } else {
119 freespace = getval();
120 }
121 if (!freespace)
122 exit(0);
123
124 return (0);
125 }
126
127 void
cleanup(void)128 cleanup(void)
129 {
130 }
131
132 int
test(void)133 test(void)
134 {
135 int i;
136 int sem = 0;
137
138 sprintf(file, "lockf.0.%d", getpid());
139 if ((fd = open(file,O_CREAT | O_TRUNC | O_RDWR, 0600)) == -1) {
140 if (errno == ENOENT)
141 return (0);
142 else
143 err(1, "creat(%s) %s:%d", file, __FILE__, __LINE__);
144 }
145 if (write(fd, &sem, sizeof(sem)) != sizeof(sem))
146 err(1, "write");
147 if (lseek(fd, 0, SEEK_SET) == -1)
148 err(1, "lseek");
149
150 pid = fork();
151 if (pid == -1) {
152 perror("fork");
153 exit(2);
154 }
155
156 if (pid == 0) { /* child */
157 alarm(60);
158 for (i = 0; i < 100 && done_testing == 0; i++) {
159 while ((get() & 1) == 0 && done_testing == 0)
160 ;
161 if (op->verbose > 3)
162 printf("Child %d, sem = %d\n", i, get()),
163 fflush(stdout);
164 incr();
165 }
166 _exit(0);
167 } else { /* parent */
168 for (i = 0; i < 100 && done_testing == 0; i++) {
169 while ((get() & 1) == 1 && done_testing == 0)
170 ;
171 if (op->verbose > 3)
172 printf("Parent %d, sem = %d\n", i, get()),
173 fflush(stdout);
174 incr();
175 }
176 }
177 close(fd);
178 if (done_testing == 1)
179 kill(pid, SIGHUP);
180 waitpid(pid, &i, 0);
181 unlink(file);
182
183 return (0);
184 }
185