From 57e8c9954663d616f85a5ccebbc4412d23728e17 Mon Sep 17 00:00:00 2001
From: Dominique Martinet <asmadeus@codewreck.org>
Date: Wed, 28 Mar 2018 09:30:32 +0200
Subject: xfer: set TCP_NODELAY on recv side

This works around hangs where only a couple of bytes could be sent
to the socket and retrying to send the last bytes of the ack never
seem to work.

Closes #1167.
---
 src/plugins/xfer/xfer-dcc.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'src/plugins/xfer/xfer-dcc.c')

diff --git a/src/plugins/xfer/xfer-dcc.c b/src/plugins/xfer/xfer-dcc.c
index 44fc56caf..19d9ee99a 100644
--- a/src/plugins/xfer/xfer-dcc.c
+++ b/src/plugins/xfer/xfer-dcc.c
@@ -28,6 +28,7 @@
 #include <sys/socket.h>
 #include <poll.h>
 #include <netinet/in.h>
+#include <netinet/tcp.h>
 #include <fcntl.h>
 #include <time.h>
 #include <netdb.h>
@@ -345,6 +346,11 @@ xfer_dcc_recv_file_child (struct t_xfer *xfer)
         return;
     }
 
+    /* set TCP_NODELAY to be more aggressive with acks */
+    /* ignore error as transfer should still work if this fails */
+    flags = 1;
+    setsockopt(xfer->sock, IPPROTO_TCP, TCP_NODELAY, &flags, sizeof(flags));
+
     /* connection is OK, change DCC status (inform parent process) */
     xfer_network_write_pipe (xfer, XFER_STATUS_ACTIVE,
                              XFER_NO_ERROR);
-- 
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