More structure for wakeup.

adsbus/wakeup.c

@@ -1,13 +1,49 @@
+#include <stdio.h>
 #include <assert.h>
 #include <unistd.h>
+#include <sys/epoll.h>
+#include <pthread.h>
 
 #include "common.h"
 
 #include "wakeup.h"
 
+static pthread_t wakeup_thread;
+static int wakeup_write_fd;
+
+static void *wakeup_main(void *arg) {
+	int read_fd = (intptr_t) arg;
+
+	int epoll_fd = epoll_create1(0);
+	assert(epoll_fd >= 0);
+
+	struct epoll_event ev = {
+		.events = EPOLLIN,
+	};
+	assert(!epoll_ctl(epoll_fd, EPOLL_CTL_ADD, read_fd, &ev));
+
+#define MAX_EVENTS 10
+	struct epoll_event events[MAX_EVENTS];
+	int nfds = epoll_wait(epoll_fd, events, MAX_EVENTS, -1);
+	if (nfds < 0) {
+		perror("epoll_wait");
+	}
+
+	close(read_fd);
+	close(epoll_fd);
+	return NULL;
+}
+
 void wakeup_init() {
 	int pipefd[2];
 	assert(!pipe(pipefd));
+	assert(!pthread_create(&wakeup_thread, NULL, wakeup_main, (void *) (intptr_t) pipefd[0]));
+	wakeup_write_fd = pipefd[1];
+}
+
+void wakeup_cleanup() {
+	close(wakeup_write_fd);
+	assert(!pthread_join(wakeup_thread, NULL));
 }
 
 void wakeup_add(struct peer *peer, int delay_ms) {