+/*
+ * GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ */
+
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
-#include <sys/types.h>
+#include <sys/types.h>
+#include <sys/stat.h>
#include <stdlib.h>
#include <unistd.h>
-#define T1 "write before unlink\n"
-#define T2 "write after unlink\n"
+#define T1 "write data before unlink\n"
+#define T2 "write data after unlink\n"
char buf[128];
int main(int argc, char **argv)
{
+ char *fname, *fname2;
+ struct stat st;
int fd, rc;
- if (argc != 2) {
- fprintf(stderr, "usage: %s filename\n", argv[1]);
+ if (argc < 2 || argc > 3) {
+ fprintf(stderr, "usage: %s filename [filename2]\n", argv[0]);
exit(1);
- } else {
- fprintf(stderr, "congratulations - program starting\n");
}
+ fname = argv[1];
+ if (argc == 3)
+ fname2 = argv[2];
+ else
+ fname2 = argv[1];
+
fprintf(stderr, "opening\n");
- fd = open(argv[1], O_RDWR | O_TRUNC | O_CREAT, 0644);
- if (fd == -1) {
- fprintf(stderr, "open (before) %s\n", strerror(errno));
- exit(1);
+ fd = open(fname, O_RDWR | O_TRUNC | O_CREAT, 0644);
+ if (fd == -1) {
+ fprintf(stderr, "open (normal) %s\n", strerror(errno));
+ exit(1);
}
fprintf(stderr, "writing\n");
- rc = write(fd, T1, strlen(T1) + 1);
- if (rc != strlen(T1) + 1) {
- fprintf(stderr, "write (before) %s\n", strerror(errno));
- exit(1);
+ rc = write(fd, T1, strlen(T1) + 1);
+ if (rc != strlen(T1) + 1) {
+ fprintf(stderr, "write (normal) %s (rc %d)\n",
+ strerror(errno), rc);
+ exit(1);
}
- fprintf(stderr, "closing\n");
- rc = close(fd);
- if (rc ) {
- fprintf(stderr, "close (before) %s\n", strerror(errno));
- exit(1);
+ if (argc == 3) {
+ fprintf (stderr, "unlinking %s\n", fname2);
+ rc = unlink(fname2);
+ if (rc) {
+ fprintf(stderr, "unlink %s\n", strerror(errno));
+ exit(1);
+ }
+ } else {
+ printf("unlink %s and press enter\n", fname);
+ getc(stdin);
}
- fprintf(stderr, "opening again\n");
- fd = open(argv[1], O_RDWR );
- if (fd == -1) {
- fprintf(stderr, "open (before) %s\n", strerror(errno));
- exit(1);
+ fprintf(stderr, "accessing (1)\n");
+ if (access(fname, F_OK) == 0) {
+ fprintf(stderr, "%s still exists\n", fname);
+ exit(1);
+ }
+
+ fprintf(stderr, "seeking (1)\n");
+ rc = lseek(fd, 0, SEEK_SET);
+ if (rc) {
+ fprintf(stderr, "seek %s\n", strerror(errno));
+ exit(1);
+ }
+
+ fprintf(stderr, "accessing (2)\n");
+ if (access(fname, F_OK) == 0) {
+ fprintf(stderr, "%s still exists\n", fname);
+ exit(1);
}
- fprintf(stderr, "unlinking\n");
- rc = unlink(argv[1]);
- if (rc ) {
- fprintf(stderr, "open %s\n", strerror(errno));
- exit(1);
+ fprintf(stderr, "fstat...\n");
+ rc = fstat(fd, &st);
+ if (rc) {
+ fprintf(stderr, "fstat (unlink) %s\n", strerror(errno));
+ exit(1);
}
+ if (st.st_nlink != 0)
+ fprintf(stderr, "st_nlink = %d\n", (int)st.st_nlink);
fprintf(stderr, "reading\n");
- rc = read(fd, buf, strlen(T1) + 1);
- if (rc != strlen(T1) + 1) {
- fprintf(stderr, "read -after %s rc %d\n", strerror(errno), rc);
- exit(1);
+ rc = read(fd, buf, strlen(T1) + 1);
+ if (rc != strlen(T1) + 1) {
+ fprintf(stderr, "read (unlink) %s (rc %d)\n",
+ strerror(errno), rc);
+ exit(1);
}
fprintf(stderr, "comparing data\n");
- if (memcmp(buf, T1, strlen(T1) + 1) ) {
+ if (memcmp(buf, T1, strlen(T1) + 1) ) {
fprintf(stderr, "FAILURE: read wrong data after unlink\n");
- exit(1);
- }
+ exit(1);
+ }
fprintf(stderr, "truncating\n");
- rc = ftruncate(fd, 0);
- if (rc ) {
- fprintf(stderr, "truncate -after unl %s\n", strerror(errno));
- exit(1);
+ rc = ftruncate(fd, 0);
+ if (rc) {
+ fprintf(stderr, "truncate (unlink) %s\n", strerror(errno));
+ exit(1);
}
-
- fprintf(stderr, "seeking\n");
+
+ fprintf(stderr, "seeking (2)\n");
rc = lseek(fd, 0, SEEK_SET);
- if (rc != 0 ) {
- fprintf(stderr, "seek (before write) %s\n", strerror(errno));
- exit(1);
+ if (rc) {
+ fprintf(stderr, "seek (after unlink trunc) %s\n",
+ strerror(errno));
+ exit(1);
}
fprintf(stderr, "writing again\n");
- rc = write(fd, T2, strlen(T2) + 1);
- if (rc != strlen(T2) + 1) {
- fprintf(stderr, "write (before) %s (rc %d)\n", strerror(errno), rc);
- exit(1);
+ rc = write(fd, T2, strlen(T2) + 1);
+ if (rc != strlen(T2) + 1) {
+ fprintf(stderr, "write (after unlink trunc) %s (rc %d)\n",
+ strerror(errno), rc);
+ exit(1);
}
- fprintf(stderr, "seeking\n");
+ fprintf(stderr, "seeking (3)\n");
rc = lseek(fd, 0, SEEK_SET);
- if (rc != 0 ) {
- fprintf(stderr, "seek (before read) %s\n", strerror(errno));
- exit(1);
+ if (rc) {
+ fprintf(stderr, "seek (before unlink read) %s\n",
+ strerror(errno));
+ exit(1);
}
fprintf(stderr, "reading again\n");
- rc = read(fd, buf, strlen(T2) + 1);
- if (rc != strlen(T2) + 1) {
- fprintf(stderr, "read (after trunc) %s\n", strerror(errno));
- exit(1);
+ rc = read(fd, buf, strlen(T2) + 1);
+ if (rc != strlen(T2) + 1) {
+ fprintf(stderr, "read (after unlink rewrite) %s (rc %d)\n",
+ strerror(errno), rc);
+ exit(1);
}
fprintf(stderr, "comparing data again\n");
- if (memcmp(buf, T2, strlen(T2) + 1) ) {
- fprintf(stderr, "FAILURE: read wrong data after trunc\n");
- exit(1);
- }
+ if (memcmp(buf, T2, strlen(T2) + 1)) {
+ fprintf(stderr, "FAILURE: read wrong data after rewrite\n");
+ exit(1);
+ }
- fprintf(stderr, "closing again\n");
- rc = close(fd);
- if (rc ) {
- fprintf(stderr, "close (before) %s\n", strerror(errno));
- exit(1);
+ fprintf(stderr, "closing\n");
+ rc = close(fd);
+ if (rc) {
+ fprintf(stderr, "close (unlink) %s\n", strerror(errno));
+ exit(1);
}
- fprintf(stderr, "SUCCESS - goto beer\n");
- return 0;
+ fprintf(stderr, "SUCCESS - goto beer\n");
+ return 0;
}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff