-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_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);
-
- if(!splay_insert_node(&loop->signals, &sig->node))
- abort();
-}
-
-void signal_del(event_loop_t *loop, signal_t *sig) {
- if(!sig->cb)
- return;
-
- splay_unlink_node(&loop->signals, &sig->node);
- sig->cb = NULL;
-}
-