+static int signal_compare(const signal_t *a, const signal_t *b) {
+ return (int)a->signum - (int)b->signum;
+}
+
+static void signalio_handler(event_loop_t *loop, void *data, int flags) {
+ unsigned char signum;
+ if(read(loop->pipefd[0], &signum, 1) != 1)
+ return;
+
+ signal_t *sig = splay_search(&loop->signals, &((signal_t) {
+ .signum = signum
+ }));
+ if(sig)
+ sig->cb(loop, sig->data);
+}
+
+static void pipe_init(event_loop_t *loop) {
+ if(!pipe(loop->pipefd))
+ io_add(loop, &loop->signalio, signalio_handler, NULL, loop->pipefd[0], IO_READ);
+}
+
+void signal_trigger(event_loop_t *loop, signal_t *sig) {
+
+ uint8_t signum = sig->signum;
+ write(loop->pipefd[1], &signum, 1);
+ return;
+
+}
+
+void signal_add(event_loop_t *loop, signal_t *sig, signal_cb_t cb, void *data, uint8_t signum) {
+ if(sig->cb)
+ return;
+
+ sig->cb = cb;
+ sig->data = data;
+ sig->signum = signum;
+ sig->node.data = sig;
+
+ if(loop->pipefd[0] == -1)
+ pipe_init(loop);