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 
28 /*
29  * --------------------------------------------------------------------
30  * The purpose of this test is to see if the bug reported (#4723351) for
31  * UFS exists when using a ZFS file system.
32  * --------------------------------------------------------------------
33  *
34  */
35 #define	_REENTRANT 1
36 #include <stdio.h>
37 #include <fcntl.h>
38 #include <pthread.h>
39 #include <errno.h>
40 #include <sys/types.h>
41 #include <sys/stat.h>
42 #include <stdlib.h>
43 #include <unistd.h>
44 
45 static const int TRUE = 1;
46 static char *filebase;
47 
48 static int
49 pickidx()
50 {
51 	return (random() % 1000);
52 }
53 
54 /* ARGSUSED */
55 static void *
56 mover(void *a)
57 {
58 	char buf[256];
59 	int idx, ret;
60 
61 	while (TRUE) {
62 		idx = pickidx();
63 		(void) sprintf(buf, "%s.%03d", filebase, idx);
64 		ret = rename(filebase, buf);
65 		if (ret < 0 && errno != ENOENT)
66 			(void) perror("renaming file");
67 	}
68 
69 	return (NULL);
70 }
71 
72 /* ARGSUSED */
73 static void *
74 cleaner(void *a)
75 {
76 	char buf[256];
77 	int idx, ret;
78 
79 	while (TRUE) {
80 		idx = pickidx();
81 		(void) sprintf(buf, "%s.%03d", filebase, idx);
82 		ret = remove(buf);
83 		if (ret < 0 && errno != ENOENT)
84 			(void) perror("removing file");
85 	}
86 
87 	return (NULL);
88 }
89 
90 static void *
91 writer(void *a)
92 {
93 	int *fd = (int *)a;
94 
95 	while (TRUE) {
96 		(void) close (*fd);
97 		*fd = open(filebase, O_APPEND | O_RDWR | O_CREAT, 0644);
98 		if (*fd < 0)
99 			perror("refreshing file");
100 		(void) write(*fd, "test\n", 5);
101 	}
102 
103 	return (NULL);
104 }
105 
106 int
107 main(int argc, char **argv)
108 {
109 	int fd;
110 	pthread_t tid;
111 
112 	if (argc == 1) {
113 		(void) printf("Usage: %s <filebase>\n", argv[0]);
114 		exit(-1);
115 	}
116 
117 	filebase = argv[1];
118 	fd = open(filebase, O_APPEND | O_RDWR | O_CREAT, 0644);
119 	if (fd < 0) {
120 		perror("creating test file");
121 		exit(-1);
122 	}
123 
124 	if (pthread_setconcurrency(4)) {	/* 3 threads + main */
125 		fprintf(stderr, "failed to set concurrency\n");
126 		exit(-1);
127 	}
128 	(void) pthread_create(&tid, NULL, mover, NULL);
129 	(void) pthread_create(&tid, NULL, cleaner, NULL);
130 	(void) pthread_create(&tid, NULL, writer, (void *) &fd);
131 
132 	while (TRUE) {
133 		int ret;
134 		struct stat st;
135 
136 		ret = stat(filebase, &st);
137 		if (ret == 0 && (st.st_nlink > 2 || st.st_nlink < 1)) {
138 			(void) printf("st.st_nlink = %d, exiting\n", \
139 			    (int)st.st_nlink);
140 			exit(0);
141 		}
142 		(void) sleep(1);
143 	}
144 
145 	return (0);
146 }
147