From 07b7c86c0672c38648fb715efbc0bfffd81ed182 Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <tridge@samba.org>
Date: Tue, 23 Nov 1999 08:43:16 +0000
Subject: [PATCH] don't write more than PIPE_BUF bytes in any one write() in
 io.c this makes sure that the write never blocks.

---
 io.c    | 7 +++++--
 rsync.h | 4 ++++
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/io.c b/io.c
index 9e2d3790..9e2a4757 100644
--- a/io.c
+++ b/io.c
@@ -361,8 +361,11 @@ static void writefd_unbuffered(int fd,char *buf,int len)
 		}
 
 		if (FD_ISSET(fd, &w_fds)) {
-			int n = len-total;
-			int ret = write(fd,buf+total,n?n:1);
+			int ret, n = len-total;
+			
+			if (n > PIPE_BUF) n = PIPE_BUF;
+
+			ret = write(fd,buf+total,n?n:1);
 
 			if (ret == -1 && errno == EINTR) {
 				continue;
diff --git a/rsync.h b/rsync.h
index 03d38dd9..7bde8b2a 100644
--- a/rsync.h
+++ b/rsync.h
@@ -285,6 +285,10 @@
 #define MAXPATHLEN 1024
 #endif
 
+#ifndef PIPE_BUF
+#define PIPE_BUF 512
+#endif
+
 #ifndef INADDR_NONE
 #define INADDR_NONE 0xffffffff
 #endif
-- 
2.34.1