Add send-receive channels

adsbus/send_receive.c

@@ -0,0 +1,68 @@
+#include <assert.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "flow.h"
+#include "list.h"
+#include "peer.h"
+#include "receive.h"
+#include "send.h"
+
+#include "send_receive.h"
+
+struct send_receive {
+	struct peer peer;
+	struct peer *on_close;
+	uint8_t ref_count;
+	struct list_head send_receive_list;
+};
+
+static struct list_head send_receive_head = LIST_HEAD_INIT(send_receive_head);
+
+static void send_receive_new(int, void *, struct peer *);
+
+static struct flow _send_receive_flow = {
+	.name = "send_receive",
+	.new = send_receive_new,
+	.get_hello = send_get_hello,
+	.ref_count = &peer_count_out_in,
+};
+struct flow *send_receive_flow = &_send_receive_flow;
+
+static void send_receive_del(struct send_receive *send_receive) {
+	list_del(&send_receive->send_receive_list);
+	peer_call(send_receive->on_close);
+	free(send_receive);
+}
+
+static void send_receive_on_close(struct peer *peer) {
+	struct send_receive *send_receive = (struct send_receive *) peer;
+
+	if (!--(send_receive->ref_count)) {
+		send_receive_del(send_receive);
+	}
+}
+
+static void send_receive_new(int fd, void *passthrough, struct peer *on_close) {
+	struct send_receive *send_receive = malloc(sizeof(*send_receive));
+	assert(send_receive);
+
+	send_receive->peer.fd = -1;
+	send_receive->peer.event_handler = send_receive_on_close;
+	send_receive->on_close = on_close;
+	send_receive->ref_count = 2;
+	list_add(&send_receive->send_receive_list, &send_receive_head);
+
+	flow_new(fd, send_flow, passthrough, on_close);
+	int fd2 = fcntl(fd, F_DUPFD_CLOEXEC, 0);
+	assert(fd2 >= 0);
+	flow_new(fd2, receive_flow, NULL, on_close);
+}
+
+void send_receive_cleanup() {
+	struct send_receive *iter, *next;
+	list_for_each_entry_safe(iter, next, &send_receive_head, send_receive_list) {
+		send_receive_del(iter);
+	}
+}