[MINOR] tcp: add support for the defer_accept bind option
This can ensure that data is readily available on a socket when
we accept it, but a bug in the kernel ignores the timeout so the
socket can remain pending as long as the client does not talk.
Use with care.
diff --git a/src/proto_tcp.c b/src/proto_tcp.c
index 7bb5d7e..884016f 100644
--- a/src/proto_tcp.c
+++ b/src/proto_tcp.c
@@ -520,6 +520,16 @@
}
}
#endif
+#if defined(TCP_DEFER_ACCEPT)
+ if (listener->options & LI_O_DEF_ACCEPT) {
+ /* defer accept by up to one second */
+ int accept_delay = 1;
+ if (setsockopt(fd, IPPROTO_TCP, TCP_DEFER_ACCEPT, &accept_delay, sizeof(accept_delay)) == -1) {
+ msg = "cannot enable DEFER_ACCEPT";
+ err |= ERR_WARN;
+ }
+ }
+#endif
if (bind(fd, (struct sockaddr *)&listener->addr, listener->proto->sock_addrlen) == -1) {
err |= ERR_RETRYABLE | ERR_ALERT;
msg = "cannot bind socket";