1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Assertion:
*
* A read operation and directory update operation performed
* concurrently on the same directory can lead to deadlock
* on a UFS logging file system, but not on a ZFS file system.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define TMP_DIR /tmp
static char dirpath[256];
int
main(int argc, char **argv)
{
const char *cp1 = "";
int i = 0;
int ret = 0;
int testdd = 0;
pid_t pid;
static const int op_num = 5;
if (argc == 1) {
(void) printf("Usage: %s <mount point>\n", argv[0]);
exit(-1);
}
for (i = 0; i < 256; i++) {
dirpath[i] = 0;
}
cp1 = argv[1];
if (strlen(cp1) >= (sizeof (dirpath) - strlen("TMP_DIR"))) {
(void) printf("The string length of mount point is "
"too large\n");
exit(-1);
}
(void) strcpy(&dirpath[0], (const char *)cp1);
(void) strcat(&dirpath[strlen(dirpath)], "TMP_DIR");
ret = mkdir(dirpath, 0777);
if (ret != 0) {
if (errno != EEXIST) {
(void) printf("%s: mkdir(<%s>, 0777) failed: errno "
"(decimal)=%d\n", argv[0], dirpath, errno);
exit(-1);
}
}
testdd = open(dirpath, O_RDONLY|O_RSYNC|O_SYNC|O_DSYNC);
if (testdd < 0) {
(void) printf("%s: open(<%s>, O_RDONLY|O_RSYNC|O_SYNC|O_DSYNC)"
" failed: errno (decimal)=%d\n", argv[0], dirpath, errno);
exit(-1);
} else {
(void) close(testdd);
}
pid = fork();
if (pid > 0) {
int fd = open(dirpath, O_RDONLY|O_RSYNC|O_SYNC|O_DSYNC);
char buf[16];
int rdret;
int j = 0;
if (fd < 0) {
(void) printf("%s: open <%s> again failed:"
" errno = %d\n", argv[0], dirpath, errno);
exit(-1);
}
while (j < op_num) {
(void) sleep(1);
rdret = read(fd, buf, 16);
if (rdret == -1) {
(void) printf("readdir failed");
}
j++;
}
(void) close(fd);
} else if (pid == 0) {
int fd = open(dirpath, O_RDONLY);
int chownret;
int k = 0;
if (fd < 0) {
(void) printf("%s: open(<%s>, O_RDONLY) again failed:"
" errno (decimal)=%d\n", argv[0], dirpath, errno);
exit(-1);
}
while (k < op_num) {
(void) sleep(1);
chownret = fchown(fd, 0, 0);
if (chownret == -1) {
(void) printf("chown failed");
}
k++;
}
(void) close(fd);
}
return (0);
}
|
