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-rw-r--r--lockfile.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/lockfile.c b/lockfile.c
index fb8f13b..9202472 100644
--- a/lockfile.c
+++ b/lockfile.c
@@ -28,6 +28,19 @@ static void remove_lock_file_on_signal(int signo)
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) {