- /* Open the lock file, first creating it if necessary. */
- for (;;) {
- /* Check whether we've already got a lock on that file. */
- if (!stat(name, &s)) {
- if (lockfile_find(s.st_dev, s.st_ino)) {
- return EDEADLK;
- }
- } else if (errno != ENOENT) {
- VLOG_WARN("%s: failed to stat lock file: %s",
- name, strerror(errno));
- return errno;
- }
-
- /* Try to open an existing lock file. */
- fd = open(name, O_RDWR);
- if (fd >= 0) {
- break;
- } else if (errno != ENOENT) {
- VLOG_WARN("%s: failed to open lock file: %s",
- name, strerror(errno));
- return errno;
- }
-
- /* Try to create a new lock file. */
- VLOG_INFO("%s: lock file does not exist, creating", name);
- fd = open(name, O_RDWR | O_CREAT | O_EXCL, 0600);
- if (fd >= 0) {
- break;
- } else if (errno != EEXIST) {
- VLOG_WARN("%s: failed to create lock file: %s",
- name, strerror(errno));
- return errno;