From 5e42fe8fc9cd6eed77681116dffeb427f5a6aca8 Mon Sep 17 00:00:00 2001
From: Simon Tatham <anakin@pobox.com>
Date: Thu, 21 Feb 2008 09:18:24 +0000
Subject: [PATCH] Aha, _that's_ why I've been periodically getting
 blocking-write problems using Unix PuTTY port forwarding. Sockets we create
 by connect() are immediately set into nonblocking mode by fcntl, but sockets
 we create by accept() were not. This trivial fix should help.

[originally from svn r7864]
---
 unix/uxnet.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/unix/uxnet.c b/unix/uxnet.c
index bfc4a8ed..bd40937a 100644
--- a/unix/uxnet.c
+++ b/unix/uxnet.c
@@ -1077,6 +1077,7 @@ static int net_select_result(int fd, int event)
 #endif
 	    socklen_t addrlen = sizeof(ss);
 	    int t;  /* socket of connection */
+            int fl;
 
 	    memset(&ss, 0, addrlen);
 	    t = accept(s->s, (struct sockaddr *)&ss, &addrlen);
@@ -1084,6 +1085,10 @@ static int net_select_result(int fd, int event)
 		break;
 	    }
 
+            fl = fcntl(t, F_GETFL);
+            if (fl != -1)
+                fcntl(t, F_SETFL, fl | O_NONBLOCK);
+
 	    if (s->localhost_only &&
 		!sockaddr_is_loopback((struct sockaddr *)&ss)) {
 		close(t);	       /* someone let nonlocal through?! */