Add support for signals using signalfd(2)

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

timer.c

@@ -56,7 +56,7 @@ static struct timespec msec2tspec(int msec)
  * timer ends its life there, while a periodic task's @param timeout is
  * reset to the @param period and restarted.
  *
- * @return The new timer, or %NULL if invalid pointers or out or memory.
+ * @return The new watcher, or %NULL with @param errno set on error.
  */
 uev_watcher_t *uev_timer_create(uev_t *ctx, uev_cb_t *handler, void *data, int timeout, int period)
 {
@@ -84,9 +84,11 @@ uev_watcher_t *uev_timer_create(uev_t *ctx, uev_cb_t *handler, void *data, int t
 /**
  * Reset or reschedule a timer
  * @param ctx  A valid libuev context
- * @param w    I/O watcher
+ * @param w    Watcher to reset
+ * @param timeout Timeout in milliseconds before @param handler is called
+ * @param period  For periodic timers this is the period time that @param timeout is reset to
  *
- * @return POSIX OK(0) or non-zero with @param errno set.
+ * @return POSIX OK(0) or non-zero with @param errno set on error.
  */
 int uev_timer_set(uev_t *ctx, uev_watcher_t *w, int timeout, int period)
 {
@@ -112,20 +114,25 @@ int uev_timer_set(uev_t *ctx, uev_watcher_t *w, int timeout, int period)
 /**
  * Delete a timer watcher
  * @param ctx  A valid libuev context
- * @param w    I/O watcher
+ * @param w    Watcher to delete
  *
- * @return POSIX OK(0) or non-zero with @param errno set.
+ * @return POSIX OK(0) or non-zero with @param errno set on error.
  */
 int uev_timer_delete(uev_t *ctx, uev_watcher_t *w)
 {
+	int fd;
+
 	if (!ctx || !w) {
 		errno = EINVAL;
 		return -1;
 	}
 
 	uev_timer_set(ctx, w, 0, 0);
+	fd = w->fd;
+	uev_watcher_delete(ctx, w);
+	close(fd);
 
-	return uev_watcher_delete(ctx, w);
+	return 0;
 }
 
 /**