static int lock_file(struct lock_file *lk, const char *path)
{
int fd;
+ struct stat st;
+
+ if ((!lstat(path, &st)) && S_ISLNK(st.st_mode)) {
+ ssize_t sz;
+ static char target[PATH_MAX];
+ sz = readlink(path, target, sizeof(target));
+ if (sz < 0)
+ warning("Cannot readlink %s", path);
+ else if (target[0] != '/')
+ warning("Cannot lock target of relative symlink %s", path);
+ else
+ path = target;
+ }
sprintf(lk->filename, "%s.lock", path);
fd = open(lk->filename, O_RDWR | O_CREAT | O_EXCL, 0666);
if (0 <= fd) {
+ if (!lock_file_list) {
+ signal(SIGINT, remove_lock_file_on_signal);
+ atexit(remove_lock_file);
+ }
lk->owner = getpid();
if (!lk->on_list) {
lk->next = lock_file_list;
lock_file_list = lk;
lk->on_list = 1;
}
- if (lock_file_list) {
- signal(SIGINT, remove_lock_file_on_signal);
- atexit(remove_lock_file);
- }
if (adjust_shared_perm(lk->filename))
return error("cannot fix permission bits on %s",
lk->filename);
unlink(lk->filename);
lk->filename[0] = 0;
}
-