1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #pragma ident "@(#)rm_lnkcnt_zero_file.c 1.3 07/05/25 SMI"
28
29 /*
30 * --------------------------------------------------------------------
31 * The purpose of this test is to see if the bug reported (#4723351) for
32 * UFS exists when using a ZFS file system.
33 * --------------------------------------------------------------------
34 *
35 */
36 #define _REENTRANT 1
37 #include <stdio.h>
38 #include <fcntl.h>
39 #include <pthread.h>
40 #include <errno.h>
41 #include <sys/types.h>
42 #include <sys/stat.h>
43 #include <stdlib.h>
44 #include <unistd.h>
45
46 static const int TRUE = 1;
47 static char *filebase;
48
49 static int
pickidx()50 pickidx()
51 {
52 return (random() % 1000);
53 }
54
55 /* ARGSUSED */
56 static void *
mover(void * a)57 mover(void *a)
58 {
59 char buf[256];
60 int idx, ret;
61
62 while (TRUE) {
63 idx = pickidx();
64 (void) sprintf(buf, "%s.%03d", filebase, idx);
65 ret = rename(filebase, buf);
66 if (ret < 0 && errno != ENOENT)
67 (void) perror("renaming file");
68 }
69
70 return (NULL);
71 }
72
73 /* ARGSUSED */
74 static void *
cleaner(void * a)75 cleaner(void *a)
76 {
77 char buf[256];
78 int idx, ret;
79
80 while (TRUE) {
81 idx = pickidx();
82 (void) sprintf(buf, "%s.%03d", filebase, idx);
83 ret = remove(buf);
84 if (ret < 0 && errno != ENOENT)
85 (void) perror("removing file");
86 }
87
88 return (NULL);
89 }
90
91 static void *
writer(void * a)92 writer(void *a)
93 {
94 int *fd = (int *)a;
95
96 while (TRUE) {
97 (void) close (*fd);
98 *fd = open(filebase, O_APPEND | O_RDWR | O_CREAT, 0644);
99 if (*fd < 0)
100 perror("refreshing file");
101 (void) write(*fd, "test\n", 5);
102 }
103
104 return (NULL);
105 }
106
107 int
main(int argc,char ** argv)108 main(int argc, char **argv)
109 {
110 int fd;
111 pthread_t tid;
112
113 if (argc == 1) {
114 (void) printf("Usage: %s <filebase>\n", argv[0]);
115 exit(-1);
116 }
117
118 filebase = argv[1];
119 fd = open(filebase, O_APPEND | O_RDWR | O_CREAT, 0644);
120 if (fd < 0) {
121 perror("creating test file");
122 exit(-1);
123 }
124
125 if (pthread_setconcurrency(4)) { /* 3 threads + main */
126 fprintf(stderr, "failed to set concurrency\n");
127 exit(-1);
128 }
129 (void) pthread_create(&tid, NULL, mover, NULL);
130 (void) pthread_create(&tid, NULL, cleaner, NULL);
131 (void) pthread_create(&tid, NULL, writer, (void *) &fd);
132
133 while (TRUE) {
134 int ret;
135 struct stat st;
136
137 ret = stat(filebase, &st);
138 if (ret == 0 && (st.st_nlink > 2 || st.st_nlink < 1)) {
139 (void) printf("st.st_nlink = %d, exiting\n", \
140 (int)st.st_nlink);
141 exit(0);
142 }
143 (void) sleep(1);
144 }
145
146 return (0);
147 }
148