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authorM S Vishwanath Bhat <vbhat@redhat.com>2012-09-12 06:50:11 +0530
committerAnand Avati <avati@redhat.com>2012-10-01 12:45:45 -0700
commit3d3222074028900ed1d4866116ba7f4dbef5e614 (patch)
treef1559e2ff9e86fc33d21b52757bcab1ddc04ed18 /extras
parentc903de38da917239fe905fc6efa1f413d120fc04 (diff)
Made test-ffop.c exhaustive by making it to test all types of fops.
Change-Id: I26052d0cbf72f81a6aa0c52498e99b635d1273e9 BUG: 861380 Signed-off-by: M S Vishwanath Bhat <vbhat@redhat.com> Reviewed-on: http://review.gluster.org/3931 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Amar Tumballi <amarts@redhat.com>
Diffstat (limited to 'extras')
-rw-r--r--extras/test/test-ffop.c777
1 files changed, 770 insertions, 7 deletions
diff --git a/extras/test/test-ffop.c b/extras/test/test-ffop.c
index 2c47ab0045b..6ce7097d5c5 100644
--- a/extras/test/test-ffop.c
+++ b/extras/test/test-ffop.c
@@ -6,20 +6,82 @@
#include <attr/xattr.h>
#include <errno.h>
#include <string.h>
+#include <dirent.h>
+
+int fd_based_fops_1 (char *filename); //for fd based fops after unlink
+int fd_based_fops_2 (char *filename); //for fd based fops before unlink
+int dup_fd_based_fops (char *filename); // fops based on fd after dup
+int path_based_fops (char *filename); //for fops based on path
+int dir_based_fops (char *filename); // for fops which operate on directory
+int link_based_fops (char *filename); //for fops which operate in link files (symlinks)
+int test_open_modes (char *filename); // to test open syscall with open modes available.
+int generic_open_read_write (char *filename, int flag); // generic function which does open write and read.
int
main (int argc, char *argv[])
{
- int ret = -1;
- int fd = 0;
- char *filename = NULL;
- struct stat stbuf = {0,};
+ int ret = -1;
+ char filename[255] = {0,};
if (argc > 1)
- filename = argv[1];
+ strcpy(filename, argv[1]);
+ else
+ strcpy(filename, "temp-xattr-test-file");
+
+ ret = fd_based_fops_1 (strcat(filename, "_1"));
+ if (ret < 0)
+ fprintf (stderr, "fd based file operation 1 failed\n");
+ else
+ fprintf (stdout, "fd based file operation 1 passed\n");
+
+ ret = fd_based_fops_2 (strcat(filename, "_2"));
+ if (ret < 0)
+ fprintf (stderr, "fd based file operation 2 failed\n");
+ else
+ fprintf (stdout, "fd based file operation 2 passed\n");
+
+ ret = dup_fd_based_fops (strcat (filename, "_3"));
+ if (ret < 0)
+ fprintf (stderr, "dup fd based file operation failed\n");
+ else
+ fprintf (stdout, "dup fd based file operation passed\n");
- if (!filename)
- filename = "temp-xattr-test-file";
+ ret = path_based_fops (strcat (filename, "_4"));
+ if (ret < 0)
+ fprintf (stderr, "path based file operation failed\n");
+ else
+ fprintf (stdout, "path based file operation passed\n");
+
+ ret = dir_based_fops (strcat (filename, "_5"));
+ if (ret < 0)
+ fprintf (stderr, "directory based file operation failed\n");
+ else
+ fprintf (stdout, "directory based file operation passed\n");
+
+ ret = link_based_fops (strcat (filename, "_5"));
+ if (ret < 0)
+ fprintf (stderr, "link based file operation failed\n");
+ else
+ fprintf (stdout, "link based file operation passed\n");
+
+ ret = test_open_modes (strcat (filename, "_5"));
+ if (ret < 0)
+ fprintf (stderr, "testing modes of 'open' call failed\n");
+ else
+ fprintf (stdout, "testing modes of 'open' call passed\n");
+
+out:
+ return ret;
+}
+
+int
+fd_based_fops_1 (char *filename)
+{
+ int fd = 0;
+ int ret = -1;
+ struct stat stbuf = {0,};
+ char wstr[50] = {0,};
+ char rstr[50] = {0,};
fd = open (filename, O_RDWR|O_CREAT);
if (fd < 0) {
@@ -34,6 +96,34 @@ main (int argc, char *argv[])
goto out;
}
+ strcpy (wstr, "This is my string\n");
+ ret = write (fd, wstr, strlen(wstr));
+ if (ret <= 0) {
+ ret = -1;
+ fprintf (stderr, "write failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = lseek (fd, 0, SEEK_SET);
+ if (ret < 0) {
+ fprintf (stderr, "lseek failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = read (fd, rstr, strlen(wstr));
+ if (ret <= 0) {
+ ret = -1;
+ fprintf (stderr, "read failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = memcmp (rstr, wstr, strlen (wstr));
+ if (ret != 0) {
+ ret = -1;
+ fprintf (stderr, "read returning junk\n");
+ goto out;
+ }
+
ret = ftruncate (fd, 0);
if (ret < 0) {
fprintf (stderr, "ftruncate failed : %s\n", strerror (errno));
@@ -103,3 +193,676 @@ out:
return ret;
}
+
+
+int
+fd_based_fops_2 (char *filename)
+{
+ int fd = 0;
+ int ret = -1;
+ struct stat stbuf = {0,};
+ char wstr[50] = {0,};
+ char rstr[50] = {0,};
+
+ fd = open (filename, O_RDWR|O_CREAT);
+ if (fd < 0) {
+ fd = 0;
+ fprintf (stderr, "open failed : %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = ftruncate (fd, 0);
+
+ if (ret < 0) {
+ fprintf (stderr, "ftruncate failed : %s\n", strerror (errno));
+ goto out;
+ }
+
+ strcpy (wstr, "This is my second string\n");
+ ret = write (fd, wstr, strlen (wstr));
+ if (ret < 0) {
+ ret = -1;
+ fprintf (stderr, "write failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ lseek (fd, 0, SEEK_SET);
+ if (ret < 0) {
+ fprintf (stderr, "lseek failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = read (fd, rstr, strlen (wstr));
+ if (ret <= 0) {
+ ret = -1;
+ fprintf (stderr, "read failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = memcmp (rstr, wstr, strlen (wstr));
+ if (ret != 0) {
+ ret = -1;
+ fprintf (stderr, "read returning junk\n");
+ goto out;
+ }
+
+ ret = fstat (fd, &stbuf);
+ if (ret < 0) {
+ fprintf (stderr, "fstat failed : %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = fchmod (fd, 0640);
+ if (ret < 0) {
+ fprintf (stderr, "fchmod failed : %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = fchown (fd, 10001, 10001);
+ if (ret < 0) {
+ fprintf (stderr, "fchown failed : %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = fsync (fd);
+ if (ret < 0) {
+ fprintf (stderr, "fsync failed : %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = fsetxattr (fd, "trusted.xattr-test", "working", 8, 0);
+ if (ret < 0) {
+ fprintf (stderr, "fsetxattr failed : %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = fdatasync (fd);
+ if (ret < 0) {
+ fprintf (stderr, "fdatasync failed : %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = flistxattr (fd, NULL, 0);
+ if (ret <= 0) {
+ ret = -1;
+ fprintf (stderr, "flistxattr failed : %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = fgetxattr (fd, "trusted.xattr-test", NULL, 0);
+ if (ret <= 0) {
+ ret = -1;
+ fprintf (stderr, "fgetxattr failed : %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = fremovexattr (fd, "trusted.xattr-test");
+ if (ret < 0) {
+ fprintf (stderr, "fremovexattr failed : %s\n", strerror (errno));
+ goto out;
+ }
+
+out:
+ if (fd)
+ close (fd);
+ unlink (filename);
+
+ return ret;
+}
+
+int
+path_based_fops (char *filename)
+{
+ int ret = -1;
+ int fd = 0;
+ struct stat stbuf = {0,};
+ char newfilename[255] = {0,};
+
+ fd = creat (filename, 0644);
+ if (fd < 0) {
+ fprintf (stderr, "creat failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = truncate (filename, 0);
+ if (ret < 0) {
+ fprintf (stderr, "truncate failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = stat (filename, &stbuf);
+ if (ret < 0) {
+ fprintf (stderr, "stat failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = chmod (filename, 0640);
+ if (ret < 0) {
+ fprintf (stderr, "chmod failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = chown (filename, 10001, 10001);
+ if (ret < 0) {
+ fprintf (stderr, "chown failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = setxattr (filename, "trusted.xattr-test", "working", 8, 0);
+ if (ret < 0) {
+ fprintf (stderr, "setxattr failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = listxattr (filename, NULL, 0);
+ if (ret <= 0) {
+ ret = -1;
+ fprintf (stderr, "listxattr failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = getxattr (filename, "trusted.xattr-test", NULL, 0);
+ if (ret <= 0) {
+ ret = -1;
+ fprintf (stderr, "getxattr failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = removexattr (filename, "trusted.xattr-test");
+ if (ret < 0) {
+ fprintf (stderr, "removexattr failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = access (filename, R_OK|W_OK);
+ if (ret < 0) {
+ fprintf (stderr, "access failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ strcpy (newfilename, filename);
+ strcat(newfilename, "_new");
+ ret = rename (filename, newfilename);
+ if (ret < 0) {
+ fprintf (stderr, "rename failed: %s\n", strerror (errno));
+ goto out;
+ }
+ unlink (newfilename);
+
+out:
+ if (fd)
+ close (fd);
+
+ unlink (filename);
+ return ret;
+}
+
+int
+dup_fd_based_fops (char *filename)
+{
+ int fd = 0;
+ int newfd = 0;
+ int ret = -1;
+ struct stat stbuf = {0,};
+ char wstr[50] = {0,};
+ char rstr[50] = {0,};
+
+ fd = open (filename, O_RDWR|O_CREAT);
+ if (fd < 0) {
+ fd = 0;
+ fprintf (stderr, "open failed : %s\n", strerror (errno));
+ goto out;
+ }
+
+ newfd = dup (fd);
+ if (newfd < 0) {
+ ret = -1;
+ fprintf (stderr, "dup failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ close (fd);
+
+ strcpy (wstr, "This is my string\n");
+ ret = write (newfd, wstr, strlen(wstr));
+ if (ret <= 0) {
+ ret = -1;
+ fprintf (stderr, "write failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = lseek (newfd, 0, SEEK_SET);
+ if (ret < 0) {
+ fprintf (stderr, "lseek failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = read (newfd, rstr, strlen(wstr));
+ if (ret <= 0) {
+ ret = -1;
+ fprintf (stderr, "read failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = memcmp (rstr, wstr, strlen (wstr));
+ if (ret != 0) {
+ ret = -1;
+ fprintf (stderr, "read returning junk\n");
+ goto out;
+ }
+
+ ret = ftruncate (newfd, 0);
+ if (ret < 0) {
+ fprintf (stderr, "ftruncate failed : %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = fstat (newfd, &stbuf);
+ if (ret < 0) {
+ fprintf (stderr, "fstat failed : %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = fchmod (newfd, 0640);
+ if (ret < 0) {
+ fprintf (stderr, "fchmod failed : %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = fchown (newfd, 10001, 10001);
+ if (ret < 0) {
+ fprintf (stderr, "fchown failed : %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = fsync (newfd);
+ if (ret < 0) {
+ fprintf (stderr, "fsync failed : %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = fsetxattr (newfd, "trusted.xattr-test", "working", 8, 0);
+ if (ret < 0) {
+ fprintf (stderr, "fsetxattr failed : %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = fdatasync (newfd);
+ if (ret < 0) {
+ fprintf (stderr, "fdatasync failed : %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = flistxattr (newfd, NULL, 0);
+ if (ret <= 0) {
+ ret = -1;
+ fprintf (stderr, "flistxattr failed : %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = fgetxattr (newfd, "trusted.xattr-test", NULL, 0);
+ if (ret <= 0) {
+ ret = -1;
+ fprintf (stderr, "fgetxattr failed : %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = fremovexattr (newfd, "trusted.xattr-test");
+ if (ret < 0) {
+ fprintf (stderr, "fremovexattr failed : %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = 0;
+out:
+ if (newfd)
+ close (newfd);
+ ret = unlink (filename);
+ if (ret < 0) {
+ fprintf (stderr, "unlink failed : %s\n", strerror (errno));
+ goto out;
+ }
+
+ return ret;
+}
+
+int
+dir_based_fops (char *dirname)
+{
+ int ret = -1;
+ DIR *dp = NULL;
+ char buff[255] = {0,};
+ struct dirent *dbuff = {0,};
+ struct stat stbuff = {0,};
+ char newdname[255] = {0,};
+ char *cwd = NULL;
+
+ ret = mkdir (dirname, 0755);
+ if (ret < 0) {
+ fprintf (stderr, "mkdir failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ dp = opendir (dirname);
+ if (dp == NULL) {
+ fprintf (stderr, "opendir failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ dbuff = readdir (dp);
+ if (NULL == dbuff) {
+ fprintf (stderr, "readdir failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = closedir (dp);
+ if (ret < 0) {
+ fprintf (stderr, "closedir failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = stat (dirname, &stbuff);
+ if (ret < 0) {
+ fprintf (stderr, "stat failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = chmod (dirname, 0744);
+ if (ret < 0) {
+ fprintf (stderr, "chmod failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = chown (dirname, 10001, 10001);
+ if (ret < 0) {
+ fprintf (stderr, "chmod failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = setxattr (dirname, "trusted.xattr-test", "working", 8, 0);
+ if (ret < 0) {
+ fprintf (stderr, "setxattr failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = listxattr (dirname, NULL, 0);
+ if (ret <= 0) {
+ ret = -1;
+ fprintf (stderr, "listxattr failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = getxattr (dirname, "trusted.xattr-test", NULL, 0);
+ if (ret <= 0) {
+ ret = -1;
+ fprintf (stderr, "getxattr failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = removexattr (dirname, "trusted.xattr-test");
+ if (ret < 0) {
+ fprintf (stderr, "removexattr failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ strcpy (newdname, dirname);
+ strcat (newdname, "/../");
+ ret = chdir (newdname);
+ if (ret < 0) {
+ fprintf (stderr, "chdir failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ cwd = getcwd (buff, 255);
+ if (NULL == cwd) {
+ fprintf (stderr, "getcwd failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ strcpy (newdname, dirname);
+ strcat (newdname, "new");
+ ret = rename (dirname, newdname);
+ if (ret < 0) {
+ fprintf (stderr, "rename failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = rmdir (newdname);
+ if (ret < 0) {
+ fprintf (stderr, "rmdir failed: %s\n", strerror (errno));
+ return ret;
+ }
+
+out:
+ rmdir (dirname);
+ return ret;
+}
+
+int
+link_based_fops (char *filename)
+{
+ int ret = -1;
+ int fd = 0;
+ char newname[255] = {0,};
+ char linkname[255] = {0,};
+ struct stat lstbuf = {0,};
+
+ fd = creat (filename, 0644);
+ if (fd < 0) {
+ fd = 0;
+ fprintf (stderr, "creat failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ strcpy (newname, filename);
+ strcat (newname, "_hlink");
+ ret = link (filename, newname);
+ if (ret < 0) {
+ fprintf (stderr, "link failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = unlink (filename);
+ if (ret < 0) {
+ fprintf (stderr, "unlink failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ strcpy (linkname, filename);
+ strcat (linkname, "_slink");
+ ret = symlink (newname, linkname);
+ if (ret < 0) {
+ fprintf (stderr, "symlink failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = lstat (linkname, &lstbuf);
+ if (ret < 0) {
+ fprintf (stderr, "lstbuf failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = lchown (linkname, 10001, 10001);
+ if (ret < 0) {
+ fprintf (stderr, "lchown failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = lsetxattr (linkname, "trusted.lxattr-test", "working", 8, 0);
+ if (ret < 0) {
+ fprintf (stderr, "lsetxattr failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = llistxattr (linkname, NULL, 0);
+ if (ret < 0) {
+ ret = -1;
+ fprintf (stderr, "llistxattr failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = lgetxattr (linkname, "trusted.lxattr-test", NULL, 0);
+ if (ret < 0) {
+ ret = -1;
+ fprintf (stderr, "lgetxattr failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+ ret = lremovexattr (linkname, "trusted.lxattr-test");
+ if (ret < 0) {
+ fprintf (stderr, "lremovexattr failed: %s\n", strerror (errno));
+ goto out;
+ }
+
+
+out:
+ if (fd)
+ close(fd);
+ unlink (linkname);
+ unlink (newname);
+}
+
+int
+test_open_modes (char *filename)
+{
+ int ret = -1;
+
+ ret = generic_open_read_write (filename, O_CREAT|O_WRONLY);
+ if (3 != ret) {
+ fprintf (stderr, "flag O_CREAT|O_WRONLY failed: \n");
+ goto out;
+ }
+
+ ret = generic_open_read_write (filename, O_CREAT|O_RDWR);
+ if (ret != 0) {
+ fprintf (stderr, "flag O_CREAT|O_RDWR failed\n");
+ goto out;
+ }
+
+ ret = generic_open_read_write (filename, O_CREAT|O_RDONLY);
+ if (ret != 0) {
+ fprintf (stderr, "flag O_CREAT|O_RDONLY failed\n");
+ goto out;
+ }
+
+ ret = creat (filename, 0644);
+ close (ret);
+ ret = generic_open_read_write (filename, O_WRONLY);
+ if (3 != ret) {
+ fprintf (stderr, "flag O_WRONLY failed\n");
+ goto out;
+ }
+
+ ret = creat (filename, 0644);
+ close (ret);
+ ret = generic_open_read_write (filename, O_RDWR);
+ if (0 != ret) {
+ fprintf (stderr, "flag O_RDWR failed\n");
+ goto out;
+ }
+
+ ret = creat (filename, 0644);
+ close (ret);
+ ret = generic_open_read_write (filename, O_RDONLY);
+ if (0 != ret) {
+ fprintf (stderr, "flag O_RDONLY failed\n");
+ goto out;
+ }
+
+ ret = creat (filename, 0644);
+ close (ret);
+ ret = generic_open_read_write (filename, O_TRUNC|O_WRONLY);
+ if (3 != ret) {
+ fprintf (stderr, "flag O_TRUNC|O_WRONLY failed\n");
+ goto out;
+ }
+
+ ret = creat (filename, 0644);
+ close (ret);
+ ret = generic_open_read_write (filename, O_TRUNC|O_RDONLY);
+ if (0 != ret) {
+ fprintf (stderr, "flag O_TRUNC|O_RDONLY failed\n");
+ goto out;
+ }
+
+ ret = generic_open_read_write (filename, O_CREAT|O_RDWR|O_SYNC);
+ if (0 != ret) {
+ fprintf (stderr, "flag O_CREAT|O_RDWR|O_SYNC failed\n");
+ goto out;
+ }
+
+ ret = creat (filename, 0644);
+ close (ret);
+ ret = generic_open_read_write (filename, O_CREAT|O_EXCL);
+ if (0 != ret) {
+ fprintf (stderr, "flag O_CREAT|O_EXCL failed\n");
+ goto out;
+ }
+
+out:
+ return ret;
+}
+
+int generic_open_read_write (char *filename, int flag)
+{
+ int fd = 0;
+ int ret = -1;
+ char wstring[50] = {0,};
+ char rstring[50] = {0,};
+
+ fd = open (filename, flag);
+ if (fd < 0) {
+ if (flag == O_CREAT|O_EXCL && errno == EEXIST) {
+ unlink (filename);
+ return 0;
+ }
+ else {
+ fd = 0;
+ fprintf (stderr, "open failed: %s\n", strerror (errno));
+ return 1;
+ }
+ }
+
+ strcpy (wstring, "My string to write\n");
+ ret = write (fd, wstring, strlen(wstring));
+ if (ret <= 0) {
+ if (errno != EBADF) {
+ fprintf (stderr, "write failed: %s\n", strerror (errno));
+ close (fd);
+ unlink(filename);
+ return 2;
+ }
+ }
+
+ ret = lseek (fd, 0, SEEK_SET);
+ if (ret < 0) {
+ close (fd);
+ unlink(filename);
+ return 4;
+ }
+
+ ret = read (fd, rstring, strlen(wstring));
+ if (ret < 0) {
+ close (fd);
+ unlink (filename);
+ return 3;
+ }
+
+ /* Compare the rstring with wstring. But we do not want to return
+ * error when the flag is either O_RDONLY, O_CREAT|O_RDONLY or
+ * O_TRUNC|O_RDONLY. Because in that case we are not writing
+ * anything to the file.*/
+
+ ret = memcmp (wstring, rstring, strlen (wstring));
+ if (0 != ret && !(flag == O_CREAT|O_RDONLY || flag == O_RDONLY ||\
+ flag == O_TRUNC|O_RDONLY)) {
+ fprintf (stderr, "read is returning junk\n");
+ close (fd);
+ unlink (filename);
+ return 4;
+ }
+
+ close (fd);
+ unlink (filename);
+ return 0;
+}