Initial commit.

This has the basic event loop, and a first cut of the libffi dispatcher.

event-loop.c

@@ -0,0 +1,107 @@
+#include <stddef.h>
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/epoll.h>
+#include <unistd.h>
+#include "wayland.h"
+
+struct wl_event_loop {
+	int epoll_fd;
+};
+
+struct wl_event_source {
+	int fd;
+	wl_event_loop_func_t func;
+	void *data;
+};
+
+struct wl_event_source *
+wl_event_loop_add_fd(struct wl_event_loop *loop,
+		     int fd, uint32_t mask,
+		     wl_event_loop_func_t func,
+		     void *data)
+{
+	struct wl_event_source *source;
+	struct epoll_event ep;
+
+	source = malloc(sizeof *source);
+	source->fd = fd;
+	source->func = func;
+	source->data = data;
+
+	ep.events = 0;
+	if (mask & WL_EVENT_READABLE)
+		ep.events |= EPOLLIN;
+	if (mask & WL_EVENT_WRITEABLE)
+		ep.events |= EPOLLOUT;
+	ep.data.ptr = source;
+
+	if (epoll_ctl(loop->epoll_fd, EPOLL_CTL_ADD, fd, &ep) < 0) {
+		free(source);
+		return NULL;
+	}
+
+	return source;
+}
+
+int
+wl_event_loop_remove_source(struct wl_event_loop *loop,
+			    struct wl_event_source *source)
+{
+	int fd;
+
+	fd = source->fd;
+	free(source);
+
+	return epoll_ctl(loop->epoll_fd, EPOLL_CTL_DEL, fd, NULL);
+}
+
+struct wl_event_loop *
+wl_event_loop_create(void)
+{
+	struct wl_event_loop *loop;
+
+	loop = malloc(sizeof *loop);
+	if (loop == NULL)
+		return NULL;
+
+	loop->epoll_fd = epoll_create(16);
+	if (loop->epoll_fd < 0) {
+		free(loop);
+		return NULL;
+	}
+
+	return loop;
+}
+
+void
+wl_event_loop_destroy(struct wl_event_loop *loop)
+{
+	close(loop->epoll_fd);
+	free(loop);
+}
+
+#define ARRAY_LENGTH(a) (sizeof (a) / sizeof (a)[0])
+
+int
+wl_event_loop_wait(struct wl_event_loop *loop)
+{
+	struct epoll_event ep[32];
+	struct wl_event_source *source;
+	int i, count;
+
+	count = epoll_wait(loop->epoll_fd, ep, ARRAY_LENGTH(ep), -1);
+	if (count < 0)
+		return -1;
+
+	for (i = 0; i < count; i++) {
+		source = ep[i].data.ptr;
+		source->func(source->fd, ep[i].events, source->data);
+	}
+
+	return 0;
+}