Fix potential hang in https handshake (v2).

From aa77ab3dd5b98a5786ac158528f45355fc0ddbc3 Mon Sep 17 00:00:00 2001

From: Stefan Zager <redacted>
Date: Thu, 18 Oct 2012 16:23:53 -0700
Subject: [PATCH] Fix potential hang in https handshake.

It will sometimes happen that curl_multi_fdset() doesn't
return any file descriptors.  In that case, it's recommended
that the application sleep for a short time before running
curl_multi_perform() again.

http://curl.haxx.se/libcurl/c/curl_multi_fdset.html

Signed-off-by: Stefan Zager <redacted>
---
 http.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/http.c b/http.c
index df9bb71..e8aba7f 100644
--- a/http.c
+++ b/http.c

@@ -630,6 +630,10 @@ void run_active_slot(struct active_request_slot *slot)
 			FD_ZERO(&writefds);
 			FD_ZERO(&excfds);
 			curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
+			if (max_fd < 0) {
+				select_timeout.tv_sec  = 0;
+				select_timeout.tv_usec = 50000;
+			}
 
 			select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
 		}

-- 
1.7.7.3