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>
This commit is contained in:
M S Vishwanath Bhat
Anand Avati
parent
c903de38da
commit
3d32220740
@ -6,20 +6,82 @@
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#include <attr/xattr.h>
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#include <errno.h>
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#include <string.h>
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#include <dirent.h>
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int fd_based_fops_1 (char *filename); //for fd based fops after unlink
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int fd_based_fops_2 (char *filename); //for fd based fops before unlink
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int dup_fd_based_fops (char *filename); // fops based on fd after dup
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int path_based_fops (char *filename); //for fops based on path
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int dir_based_fops (char *filename); // for fops which operate on directory
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int link_based_fops (char *filename); //for fops which operate in link files (symlinks)
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int test_open_modes (char *filename); // to test open syscall with open modes available.
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int generic_open_read_write (char *filename, int flag); // generic function which does open write and read.
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int
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main (int argc, char *argv[])
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{
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int ret = -1;
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int fd = 0;
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char *filename = NULL;
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struct stat stbuf = {0,};
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int ret = -1;
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char filename[255] = {0,};
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if (argc > 1)
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filename = argv[1];
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strcpy(filename, argv[1]);
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else
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strcpy(filename, "temp-xattr-test-file");
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if (!filename)
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filename = "temp-xattr-test-file";
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ret = fd_based_fops_1 (strcat(filename, "_1"));
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if (ret < 0)
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fprintf (stderr, "fd based file operation 1 failed\n");
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else
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fprintf (stdout, "fd based file operation 1 passed\n");
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ret = fd_based_fops_2 (strcat(filename, "_2"));
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if (ret < 0)
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fprintf (stderr, "fd based file operation 2 failed\n");
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else
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fprintf (stdout, "fd based file operation 2 passed\n");
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ret = dup_fd_based_fops (strcat (filename, "_3"));
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if (ret < 0)
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fprintf (stderr, "dup fd based file operation failed\n");
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else
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fprintf (stdout, "dup fd based file operation passed\n");
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ret = path_based_fops (strcat (filename, "_4"));
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if (ret < 0)
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fprintf (stderr, "path based file operation failed\n");
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else
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fprintf (stdout, "path based file operation passed\n");
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ret = dir_based_fops (strcat (filename, "_5"));
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if (ret < 0)
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fprintf (stderr, "directory based file operation failed\n");
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else
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fprintf (stdout, "directory based file operation passed\n");
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ret = link_based_fops (strcat (filename, "_5"));
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if (ret < 0)
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fprintf (stderr, "link based file operation failed\n");
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else
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fprintf (stdout, "link based file operation passed\n");
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ret = test_open_modes (strcat (filename, "_5"));
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if (ret < 0)
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fprintf (stderr, "testing modes of 'open' call failed\n");
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else
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fprintf (stdout, "testing modes of 'open' call passed\n");
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out:
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return ret;
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}
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int
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fd_based_fops_1 (char *filename)
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{
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int fd = 0;
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int ret = -1;
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struct stat stbuf = {0,};
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char wstr[50] = {0,};
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char rstr[50] = {0,};
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fd = open (filename, O_RDWR|O_CREAT);
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if (fd < 0) {
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@ -34,6 +96,34 @@ main (int argc, char *argv[])
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goto out;
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}
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strcpy (wstr, "This is my string\n");
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ret = write (fd, wstr, strlen(wstr));
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if (ret <= 0) {
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ret = -1;
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fprintf (stderr, "write failed: %s\n", strerror (errno));
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goto out;
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}
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ret = lseek (fd, 0, SEEK_SET);
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if (ret < 0) {
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fprintf (stderr, "lseek failed: %s\n", strerror (errno));
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goto out;
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}
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ret = read (fd, rstr, strlen(wstr));
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if (ret <= 0) {
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ret = -1;
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fprintf (stderr, "read failed: %s\n", strerror (errno));
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goto out;
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}
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ret = memcmp (rstr, wstr, strlen (wstr));
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if (ret != 0) {
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ret = -1;
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fprintf (stderr, "read returning junk\n");
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goto out;
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}
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ret = ftruncate (fd, 0);
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if (ret < 0) {
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fprintf (stderr, "ftruncate failed : %s\n", strerror (errno));
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@ -103,3 +193,676 @@ out:
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return ret;
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}
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int
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fd_based_fops_2 (char *filename)
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{
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int fd = 0;
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int ret = -1;
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struct stat stbuf = {0,};
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char wstr[50] = {0,};
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char rstr[50] = {0,};
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fd = open (filename, O_RDWR|O_CREAT);
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if (fd < 0) {
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fd = 0;
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fprintf (stderr, "open failed : %s\n", strerror (errno));
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goto out;
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}
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ret = ftruncate (fd, 0);
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if (ret < 0) {
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fprintf (stderr, "ftruncate failed : %s\n", strerror (errno));
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goto out;
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}
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strcpy (wstr, "This is my second string\n");
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ret = write (fd, wstr, strlen (wstr));
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if (ret < 0) {
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ret = -1;
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fprintf (stderr, "write failed: %s\n", strerror (errno));
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goto out;
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}
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lseek (fd, 0, SEEK_SET);
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if (ret < 0) {
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fprintf (stderr, "lseek failed: %s\n", strerror (errno));
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goto out;
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}
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ret = read (fd, rstr, strlen (wstr));
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if (ret <= 0) {
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ret = -1;
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fprintf (stderr, "read failed: %s\n", strerror (errno));
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goto out;
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}
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ret = memcmp (rstr, wstr, strlen (wstr));
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if (ret != 0) {
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ret = -1;
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fprintf (stderr, "read returning junk\n");
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goto out;
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}
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ret = fstat (fd, &stbuf);
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if (ret < 0) {
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fprintf (stderr, "fstat failed : %s\n", strerror (errno));
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goto out;
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}
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ret = fchmod (fd, 0640);
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if (ret < 0) {
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fprintf (stderr, "fchmod failed : %s\n", strerror (errno));
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goto out;
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}
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ret = fchown (fd, 10001, 10001);
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if (ret < 0) {
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fprintf (stderr, "fchown failed : %s\n", strerror (errno));
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goto out;
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}
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ret = fsync (fd);
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if (ret < 0) {
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fprintf (stderr, "fsync failed : %s\n", strerror (errno));
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goto out;
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}
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ret = fsetxattr (fd, "trusted.xattr-test", "working", 8, 0);
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if (ret < 0) {
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fprintf (stderr, "fsetxattr failed : %s\n", strerror (errno));
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goto out;
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}
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ret = fdatasync (fd);
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if (ret < 0) {
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fprintf (stderr, "fdatasync failed : %s\n", strerror (errno));
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goto out;
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}
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ret = flistxattr (fd, NULL, 0);
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if (ret <= 0) {
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ret = -1;
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fprintf (stderr, "flistxattr failed : %s\n", strerror (errno));
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goto out;
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}
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ret = fgetxattr (fd, "trusted.xattr-test", NULL, 0);
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if (ret <= 0) {
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ret = -1;
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fprintf (stderr, "fgetxattr failed : %s\n", strerror (errno));
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goto out;
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}
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ret = fremovexattr (fd, "trusted.xattr-test");
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if (ret < 0) {
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fprintf (stderr, "fremovexattr failed : %s\n", strerror (errno));
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goto out;
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}
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out:
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if (fd)
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close (fd);
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unlink (filename);
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return ret;
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}
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int
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path_based_fops (char *filename)
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{
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int ret = -1;
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int fd = 0;
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struct stat stbuf = {0,};
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char newfilename[255] = {0,};
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fd = creat (filename, 0644);
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if (fd < 0) {
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fprintf (stderr, "creat failed: %s\n", strerror (errno));
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goto out;
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}
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ret = truncate (filename, 0);
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if (ret < 0) {
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fprintf (stderr, "truncate failed: %s\n", strerror (errno));
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goto out;
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}
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ret = stat (filename, &stbuf);
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if (ret < 0) {
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fprintf (stderr, "stat failed: %s\n", strerror (errno));
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goto out;
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}
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ret = chmod (filename, 0640);
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if (ret < 0) {
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fprintf (stderr, "chmod failed: %s\n", strerror (errno));
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goto out;
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}
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ret = chown (filename, 10001, 10001);
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if (ret < 0) {
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fprintf (stderr, "chown failed: %s\n", strerror (errno));
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goto out;
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}
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ret = setxattr (filename, "trusted.xattr-test", "working", 8, 0);
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if (ret < 0) {
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fprintf (stderr, "setxattr failed: %s\n", strerror (errno));
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goto out;
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}
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ret = listxattr (filename, NULL, 0);
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if (ret <= 0) {
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ret = -1;
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fprintf (stderr, "listxattr failed: %s\n", strerror (errno));
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goto out;
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}
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ret = getxattr (filename, "trusted.xattr-test", NULL, 0);
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if (ret <= 0) {
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ret = -1;
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fprintf (stderr, "getxattr failed: %s\n", strerror (errno));
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goto out;
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}
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ret = removexattr (filename, "trusted.xattr-test");
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if (ret < 0) {
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fprintf (stderr, "removexattr failed: %s\n", strerror (errno));
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goto out;
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}
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ret = access (filename, R_OK|W_OK);
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if (ret < 0) {
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fprintf (stderr, "access failed: %s\n", strerror (errno));
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goto out;
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}
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strcpy (newfilename, filename);
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strcat(newfilename, "_new");
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ret = rename (filename, newfilename);
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if (ret < 0) {
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fprintf (stderr, "rename failed: %s\n", strerror (errno));
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goto out;
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}
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unlink (newfilename);
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out:
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if (fd)
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close (fd);
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unlink (filename);
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return ret;
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}
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int
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dup_fd_based_fops (char *filename)
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{
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int fd = 0;
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int newfd = 0;
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int ret = -1;
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struct stat stbuf = {0,};
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char wstr[50] = {0,};
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char rstr[50] = {0,};
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fd = open (filename, O_RDWR|O_CREAT);
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if (fd < 0) {
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fd = 0;
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fprintf (stderr, "open failed : %s\n", strerror (errno));
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goto out;
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}
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newfd = dup (fd);
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if (newfd < 0) {
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ret = -1;
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fprintf (stderr, "dup failed: %s\n", strerror (errno));
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goto out;
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}
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close (fd);
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strcpy (wstr, "This is my string\n");
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ret = write (newfd, wstr, strlen(wstr));
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if (ret <= 0) {
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ret = -1;
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fprintf (stderr, "write failed: %s\n", strerror (errno));
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goto out;
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}
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ret = lseek (newfd, 0, SEEK_SET);
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if (ret < 0) {
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fprintf (stderr, "lseek failed: %s\n", strerror (errno));
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goto out;
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}
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ret = read (newfd, rstr, strlen(wstr));
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if (ret <= 0) {
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ret = -1;
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fprintf (stderr, "read failed: %s\n", strerror (errno));
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goto out;
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}
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ret = memcmp (rstr, wstr, strlen (wstr));
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if (ret != 0) {
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ret = -1;
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fprintf (stderr, "read returning junk\n");
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goto out;
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}
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ret = ftruncate (newfd, 0);
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if (ret < 0) {
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fprintf (stderr, "ftruncate failed : %s\n", strerror (errno));
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goto out;
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}
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ret = fstat (newfd, &stbuf);
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if (ret < 0) {
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fprintf (stderr, "fstat failed : %s\n", strerror (errno));
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goto out;
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}
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ret = fchmod (newfd, 0640);
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if (ret < 0) {
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fprintf (stderr, "fchmod failed : %s\n", strerror (errno));
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goto out;
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}
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ret = fchown (newfd, 10001, 10001);
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if (ret < 0) {
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fprintf (stderr, "fchown failed : %s\n", strerror (errno));
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goto out;
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}
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ret = fsync (newfd);
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if (ret < 0) {
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fprintf (stderr, "fsync failed : %s\n", strerror (errno));
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goto out;
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}
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ret = fsetxattr (newfd, "trusted.xattr-test", "working", 8, 0);
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if (ret < 0) {
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fprintf (stderr, "fsetxattr failed : %s\n", strerror (errno));
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goto out;
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}
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ret = fdatasync (newfd);
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if (ret < 0) {
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fprintf (stderr, "fdatasync failed : %s\n", strerror (errno));
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goto out;
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}
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ret = flistxattr (newfd, NULL, 0);
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if (ret <= 0) {
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ret = -1;
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fprintf (stderr, "flistxattr failed : %s\n", strerror (errno));
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goto out;
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}
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ret = fgetxattr (newfd, "trusted.xattr-test", NULL, 0);
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if (ret <= 0) {
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ret = -1;
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fprintf (stderr, "fgetxattr failed : %s\n", strerror (errno));
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goto out;
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}
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ret = fremovexattr (newfd, "trusted.xattr-test");
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if (ret < 0) {
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fprintf (stderr, "fremovexattr failed : %s\n", strerror (errno));
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goto out;
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}
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ret = 0;
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out:
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if (newfd)
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close (newfd);
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ret = unlink (filename);
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if (ret < 0) {
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fprintf (stderr, "unlink failed : %s\n", strerror (errno));
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goto out;
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}
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return ret;
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}
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int
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dir_based_fops (char *dirname)
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{
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int ret = -1;
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DIR *dp = NULL;
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char buff[255] = {0,};
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struct dirent *dbuff = {0,};
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struct stat stbuff = {0,};
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char newdname[255] = {0,};
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char *cwd = NULL;
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ret = mkdir (dirname, 0755);
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if (ret < 0) {
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fprintf (stderr, "mkdir failed: %s\n", strerror (errno));
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goto out;
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}
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dp = opendir (dirname);
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if (dp == NULL) {
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fprintf (stderr, "opendir failed: %s\n", strerror (errno));
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goto out;
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}
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dbuff = readdir (dp);
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if (NULL == dbuff) {
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fprintf (stderr, "readdir failed: %s\n", strerror (errno));
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goto out;
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}
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ret = closedir (dp);
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if (ret < 0) {
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fprintf (stderr, "closedir failed: %s\n", strerror (errno));
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goto out;
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}
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ret = stat (dirname, &stbuff);
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if (ret < 0) {
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fprintf (stderr, "stat failed: %s\n", strerror (errno));
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goto out;
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}
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|
||||
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;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user