From 852fa3b2e32719d094f3ad6513238841ae1f078b Mon Sep 17 00:00:00 2001
From: Mark Andrews <marka@isc.org>
Date: Tue, 22 Jan 2002 02:38:34 +0000
Subject: [PATCH] 1183.   [bug]           Handle ENOSR error when writing to
 the internal                         control pipe. [RT #2395]

---
 CHANGES               |  3 +++
 lib/isc/unix/socket.c | 12 +++++++++++-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/CHANGES b/CHANGES
index afeed962e8..ad76c227ff 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,6 @@
+1183.	[bug]		Handle ENOSR error when writing to the internal
+			control pipe. [RT #2395]
+
 1182.	[bug]		The server could throw an assertion failure when
 			constructing a negative response packet.
 
diff --git a/lib/isc/unix/socket.c b/lib/isc/unix/socket.c
index b5daffaf4e..4d2fcd4ed0 100644
--- a/lib/isc/unix/socket.c
+++ b/lib/isc/unix/socket.c
@@ -15,7 +15,7 @@
  * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: socket.c,v 1.219 2001/12/19 05:51:34 marka Exp $ */
+/* $Id: socket.c,v 1.220 2002/01/22 02:38:34 marka Exp $ */
 
 #include <config.h>
 
@@ -378,6 +378,16 @@ select_poke(isc_socketmgr_t *mgr, int fd, int msg) {
 
 	do {
 		cc = write(mgr->pipe_fds[1], buf, sizeof(buf));
+#ifdef ENOSR
+		/*
+		 * Treat ENOSR as EAGAIN but loop slowly as it is
+		 * unlikely to clear fast.
+		 */
+		if (cc < 0 && errno == ENOSR) {
+			sleep(1);
+			errno = EAGAIN;
+		}
+#endif
 	} while (cc < 0 && SOFT_ERROR(errno));
 			        
 	if (cc < 0) {