- int ret = 0;
- if (fd != -1 && !wim->wim_locked) {
- ret = flock(fd, LOCK_EX | LOCK_NB);
- if (ret != 0) {
- if (errno == EWOULDBLOCK) {
- ERROR("`%"TS"' is already being modified or has been "
- "mounted read-write\n"
- " by another process!", wim->filename);
- ret = WIMLIB_ERR_ALREADY_LOCKED;
- } else {
- WARNING_WITH_ERRNO("Failed to lock `%"TS"'",
- wim->filename);
- ret = 0;
- }
- } else {
- wim->wim_locked = 1;
- }
+ if (wim->locked_for_append)
+ return 0;
+ if (!flock(wim->in_fd.fd, LOCK_EX | LOCK_NB)) {
+ wim->locked_for_append = 1;
+ return 0;
+ }
+ if (errno != EWOULDBLOCK)
+ return 0;
+ return WIMLIB_ERR_ALREADY_LOCKED;
+}
+
+/* Remove advisory lock on WIM file (if present) */
+void
+unlock_wim_for_append(WIMStruct *wim)
+{
+ if (wim->locked_for_append) {
+ flock(wim->in_fd.fd, LOCK_UN);
+ wim->locked_for_append = 0;