socket: Add support for TCP defer accept

TCP_DEFER_ACCEPT Allow a listener to be awakened only when data
arrives on the socket. If TCP_DEFER_ACCEPT set on a server-side
listening socket, the TCP/IP stack will not to wait for the final
ACK packet and not to initiate the process until the first packet
of real data has arrived. After sending the SYN/ACK, the server will
then wait for a data packet from a client. Now, only three packets
will be sent over the network, and the connection establishment delay
will be significantly reduced.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/core/socket.h b/src/core/socket.h
index 8871eb1ca3..eede70564a 100644
--- a/src/core/socket.h
+++ b/src/core/socket.h
@@ -105,6 +105,7 @@ struct Socket {
         usec_t timeout_usec;
         usec_t keep_alive_time;
         usec_t keep_alive_interval;
+        usec_t defer_accept;
 
         ExecCommand* exec_command[_SOCKET_EXEC_COMMAND_MAX];
         ExecContext exec_context;