X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=udp_send.c;h=3804c39c1b96571e6a6553c97ed5dd690284c47f;hp=61cab430c04dca75f1e89c5e4821be3b24328dfe;hb=002731cd3938f3be6b71651e56c062af1adcdec0;hpb=9692b4241bc316665bd5b6810ea8af83057a0a89

diff --git a/udp_send.c b/udp_send.c
index 61cab430..3804c39c 100644
--- a/udp_send.c
+++ b/udp_send.c
@@ -25,7 +25,8 @@
 #include "net.h"
 #include "fd.h"
 #include "sched.h"
-
+#include "close_on_fork.h"
+#include "chunk_queue.h"
 
 /** Convert in_addr to ascii. */
 #define TARGET_ADDR(oc) inet_ntoa((oc)->addr)
@@ -40,37 +41,35 @@ struct udp_target {
 	int port;
 	/** The socket fd. */
 	int fd;
+	/** The list of queued chunks for this fd. */
+	struct chunk_queue *cq;
 };
 
 static struct list_head targets;
 static int sender_status;
 
+static void udp_close_target(struct udp_target *ut)
+{
+	if (ut->fd < 0)
+		return;
+	close(ut->fd);
+	del_close_on_fork_list(ut->fd);
+	cq_destroy(ut->cq);
+	ut->cq = NULL;
+	ut->fd = -1;
+}
+
 static void udp_delete_target(struct udp_target *ut, const char *msg)
 {
 	PARA_NOTICE_LOG("deleting %s:%d (%s) from list\n", TARGET_ADDR(ut),
 		ut->port, msg);
-	if (ut->fd >= 0)
-		close(ut->fd);
+	udp_close_target(ut);
 	list_del(&ut->node);
 	free(ut);
 }
 
-static void udp_send_buf(char *buf, size_t len)
-{
-	struct udp_target *ut, *tmp;
-	int ret;
-
-	list_for_each_entry_safe(ut, tmp, &targets, node) {
-		size_t written = len;
-		if (ut->fd < 0)
-			continue;
-		ret = write_all(ut->fd, buf, &written);
-		if (ret < 0) /* TODO: Use chunk queueing */
-			return udp_delete_target(ut, "send error");
-		if (written != len)
-			PARA_WARNING_LOG("short write %zu/%zu\n", written, len);
-	}
-}
+/** The maximal size of the per-target chunk queue. */
+#define UDP_CQ_BYTES 40000
 
 static int udp_init_session(struct udp_target *ut)
 {
@@ -78,28 +77,77 @@ static int udp_init_session(struct udp_target *ut)
 
 	if (ut->fd >= 0) /* nothing to do */
 		return 0;
-	PARA_NOTICE_LOG("sending to udp %s:%d\n", TARGET_ADDR(ut), ut->port);
-	/* TODO: Make ttl configurable. */
-	ret = create_udp_send_socket(TARGET_ADDR(ut), ut->port, 10);
+	ret = create_udp_send_socket(TARGET_ADDR(ut), ut->port,
+		conf.udp_ttl_arg);
 	if (ret < 0)
 		return ret;
 	ut->fd = ret;
-	return mark_fd_nonblocking(ut->fd);
+	ret = mark_fd_nonblocking(ut->fd);
+	if (ret < 0) {
+		close(ut->fd);
+		return ret;
+	}
+	add_close_on_fork_list(ut->fd);
+	ut->cq = cq_new(UDP_CQ_BYTES);
+	PARA_NOTICE_LOG("sending to udp %s:%d\n", TARGET_ADDR(ut), ut->port);
+	return 1;
+}
+
+static void udp_send_buf(char *buf, size_t len)
+{
+	struct udp_target *ut, *tmp;
+	int ret;
+
+	list_for_each_entry_safe(ut, tmp, &targets, node) {
+		ret = udp_init_session(ut);
+		if (ret < 0) {
+			udp_delete_target(ut, para_strerror(-ret));
+			continue;
+		}
+		ret = send_queued_chunks(ut->fd, ut->cq, 0);
+		if (ret < 0) {
+			udp_delete_target(ut, para_strerror(-ret));
+			continue;
+		}
+		if (!len)
+			continue;
+		if (!ret) { /* still data left in the queue */
+			ret = cq_enqueue(ut->cq, buf, len);
+			if (ret < 0) {
+				udp_delete_target(ut, para_strerror(-ret));
+				continue;
+			}
+		}
+		ret = write_nonblock(ut->fd, buf, len, 0);
+		if (ret < 0) {
+			udp_delete_target(ut, para_strerror(-ret));
+			continue;
+		}
+		if (ret != len) {
+			ret = cq_enqueue(ut->cq, buf + ret, len - ret);
+			if (ret < 0) {
+				udp_delete_target(ut, para_strerror(-ret));
+				continue;
+			}
+		}
+	}
 }
 
 static void udp_shutdown_targets(void)
 {
 	char buf[UDP_AUDIO_HEADER_LEN];
 	struct udp_target *ut, *tmp;
+	struct udp_audio_header uah = {
+		.stream_type = UDP_UNKNOWN_STREAM,
+		.packet_type = UDP_EOF_PACKET,
+	};
 
-	udp_write_packet_type(buf, UDP_EOF_PACKET);
-	udp_write_magic(buf);
+	write_udp_audio_header(buf, &uah);
 	list_for_each_entry_safe(ut, tmp, &targets, node) {
 		if (ut->fd < 0)
 			continue;
 		write(ut->fd, buf, UDP_AUDIO_HEADER_LEN);
-		close(ut->fd);
-		ut->fd = -1;
+		udp_close_target(ut);
 	}
 }
 
@@ -121,16 +169,12 @@ static void udp_send(long unsigned current_chunk, __a_unused long unsigned chunk
 		const char *buf, size_t len, const char *header_buf,
 		size_t header_len)
 {
-	struct udp_target *ut, *tmp;
-	size_t sendbuf_len;
-	uint8_t packet_type = UDP_DATA_PACKET;
-	int ret;
 	char *sendbuf;
+	size_t sendbuf_len;
 	struct timeval *chunk_tv;
-	uint8_t stream_type = header_len? UDP_HEADER_STREAM : UDP_PLAIN_STREAM;
+	struct udp_audio_header uah;
 
-//	PARA_NOTICE_LOG("header_len: %zd, header_buf: %p\n", header_len,
-//		header_buf);
+//	PARA_NOTICE_LOG("len: %zd, header_len: %zd\n", len, header_len);
 	if (sender_status != SENDER_ON)
 		return;
 
@@ -140,27 +184,22 @@ static void udp_send(long unsigned current_chunk, __a_unused long unsigned chunk
 		return;
 	if (list_empty(&targets))
 		return;
-	list_for_each_entry_safe(ut, tmp, &targets, node) {
-		ret = udp_init_session(ut);
-		if (ret < 0)
-			udp_delete_target(ut, para_strerror(-ret));
-	}
-	if (!need_extra_header(current_chunk))
-		header_len = 0;
+	uah.stream_type = header_len? UDP_HEADER_STREAM : UDP_PLAIN_STREAM;
+	uah.header_len = need_extra_header(current_chunk)? header_len : 0;
 	if (!current_chunk)
-		packet_type = UDP_BOF_PACKET;
-	else if (header_len)
-		packet_type = UDP_HEADER_PACKET;
-	sendbuf_len = UDP_AUDIO_HEADER_LEN + header_len + len;
+		uah.packet_type = UDP_BOF_PACKET;
+	else if (uah.header_len)
+		uah.packet_type = UDP_HEADER_PACKET;
+	else
+		uah.packet_type = UDP_DATA_PACKET;
+	uah.payload_len = uah.header_len + len;
+	sendbuf_len = UDP_AUDIO_HEADER_LEN + uah.payload_len;
 	sendbuf = para_malloc(sendbuf_len);
-	udp_write_magic(sendbuf);
-	udp_write_stream_type(sendbuf, stream_type);
-	udp_write_packet_type(sendbuf, packet_type);
-	udp_write_header_len(sendbuf, header_len);
-	if (header_len)
+	write_udp_audio_header(sendbuf, &uah);
+	if (uah.header_len)
 		memcpy(sendbuf + UDP_AUDIO_HEADER_LEN, header_buf,
-			header_len);
-	memcpy(sendbuf + UDP_AUDIO_HEADER_LEN + header_len, buf, len);
+			uah.header_len);
+	memcpy(sendbuf + UDP_AUDIO_HEADER_LEN + uah.header_len, buf, len);
 	udp_send_buf(sendbuf, sendbuf_len);
 	free(sendbuf);
 }