137 lines
3.2 KiB
C
137 lines
3.2 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or https://opensource.org/licenses/CDDL-1.0.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/*
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* Assertion:
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*
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* A read operation and directory update operation performed
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* concurrently on the same directory can lead to deadlock
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* on a UFS logging file system, but not on a ZFS file system.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#define TMP_DIR /tmp
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static char dirpath[256];
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int
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main(int argc, char **argv)
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{
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const char *cp1 = "";
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int i = 0;
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int ret = 0;
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int testdd = 0;
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pid_t pid;
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static const int op_num = 5;
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if (argc == 1) {
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(void) printf("Usage: %s <mount point>\n", argv[0]);
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exit(-1);
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}
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for (i = 0; i < 256; i++) {
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dirpath[i] = 0;
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}
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cp1 = argv[1];
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if (strlen(cp1) >= (sizeof (dirpath) - strlen("TMP_DIR"))) {
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(void) printf("The string length of mount point is "
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"too large\n");
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exit(-1);
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}
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(void) strcpy(&dirpath[0], (const char *)cp1);
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(void) strcat(&dirpath[strlen(dirpath)], "TMP_DIR");
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ret = mkdir(dirpath, 0777);
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if (ret != 0) {
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if (errno != EEXIST) {
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(void) printf("%s: mkdir(<%s>, 0777) failed: errno "
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"(decimal)=%d\n", argv[0], dirpath, errno);
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exit(-1);
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}
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}
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testdd = open(dirpath, O_RDONLY|O_RSYNC|O_SYNC|O_DSYNC);
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if (testdd < 0) {
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(void) printf("%s: open(<%s>, O_RDONLY|O_RSYNC|O_SYNC|O_DSYNC)"
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" failed: errno (decimal)=%d\n", argv[0], dirpath, errno);
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exit(-1);
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} else {
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(void) close(testdd);
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}
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pid = fork();
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if (pid > 0) {
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int fd = open(dirpath, O_RDONLY|O_RSYNC|O_SYNC|O_DSYNC);
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char buf[16];
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int rdret;
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int j = 0;
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if (fd < 0) {
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(void) printf("%s: open <%s> again failed:"
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" errno = %d\n", argv[0], dirpath, errno);
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exit(-1);
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}
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while (j < op_num) {
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(void) sleep(1);
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rdret = read(fd, buf, 16);
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if (rdret == -1) {
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(void) printf("readdir failed");
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}
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j++;
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}
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(void) close(fd);
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} else if (pid == 0) {
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int fd = open(dirpath, O_RDONLY);
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int chownret;
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int k = 0;
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if (fd < 0) {
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(void) printf("%s: open(<%s>, O_RDONLY) again failed:"
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" errno (decimal)=%d\n", argv[0], dirpath, errno);
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exit(-1);
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}
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while (k < op_num) {
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(void) sleep(1);
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chownret = fchown(fd, 0, 0);
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if (chownret == -1) {
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(void) printf("chown failed");
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}
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k++;
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}
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(void) close(fd);
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}
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return (0);
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}
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