From 9148bf110ec104dd6035c8f511d4c88afb276278 Mon Sep 17 00:00:00 2001
From: Wilfried Goesgens <dothebart@citadel.org>
Date: Sat, 6 Nov 2010 12:18:23 +0100
Subject: [PATCH] Nonblocking sockets need to select while writing

 we changed the SMTP outbound connections to be nonblocking so we could abort on not reacting SMTP-Servers.
 thus we need to select before writing, else the connection will fail.
---
 citadel/clientsocket.c | 34 ++++++++++++++++++++++++++++++++--
 1 file changed, 32 insertions(+), 2 deletions(-)

diff --git a/citadel/clientsocket.c b/citadel/clientsocket.c
index 49dee67b2..159ec7212 100644
--- a/citadel/clientsocket.c
+++ b/citadel/clientsocket.c
@@ -231,10 +231,40 @@ INLINE int sock_read(int *sock, char *buf, int bytes,
  */
 int sock_write(int *sock, const char *buf, int nbytes)
 {
+	int nSuccessLess = 0;
 	int bytes_written = 0;
 	int retval;
-
-	while ((*sock != -1) && (bytes_written < nbytes)) {
+	fd_set rfds;
+        int fdflags;
+	int IsNonBlock;
+	int timeout = 50;
+	struct timeval tv;
+	int selectresolution = 100;
+
+	fdflags = fcntl(*sock, F_GETFL);
+	IsNonBlock = (fdflags & O_NONBLOCK) == O_NONBLOCK;
+
+	while ((nSuccessLess < timeout) && 
+	       (*sock != -1) && 
+	       (bytes_written < nbytes)) 
+	{
+		if (IsNonBlock){
+			tv.tv_sec = selectresolution;
+			tv.tv_usec = 0;
+			
+			FD_ZERO(&rfds);
+			FD_SET(*sock, &rfds);
+			if (select(*sock + 1, NULL, &rfds, NULL, &tv) == -1) {
+///				*Error = strerror(errno);
+				close (*sock);
+				*sock = -1;
+				return -1;
+			}
+		}
+		if (IsNonBlock && !  FD_ISSET(*sock, &rfds)) {
+			nSuccessLess ++;
+			continue;
+		}
 		retval = write(*sock, &buf[bytes_written],
 			       nbytes - bytes_written);
 		if (retval < 1) {
-- 
2.39.2