Fix for BUG#12751: Instance Manager: client hangs after

start instance; kill mysqlmanager; show ...

The problem was that Instance Manager didn't close client
sockets (sockets for client connections) on execing mysqld
instance. So, mysqld-instance inherits these descriptors.

The fix is to set close-on-exec flag for each client socket.

mysql-test/r/im_daemon_life_cycle.result

@@ -8,3 +8,17 @@ mysqld2	offline
 Killing the process...
 Sleeping...
 Success: the process was restarted.
+
+--------------------------------------------------------------------
+-- Test for BUG#12751
+--------------------------------------------------------------------
+START INSTANCE mysqld2;
+Success: the process has been started.
+Killing the process...
+Sleeping...
+Success: the process was restarted.
+SHOW INSTANCE STATUS mysqld1;
+instance_name	status	version
+mysqld1	online	VERSION
+STOP INSTANCE mysqld2;
+Success: the process has been stopped.

mysql-test/t/im_daemon_life_cycle.imtest

@@ -14,3 +14,47 @@
 # process.
 
 --exec $MYSQL_TEST_DIR/t/kill_n_check.sh $IM_PATH_PID restarted 30
+
+###########################################################################
+
+#
+# BUG#12751: Instance Manager: client hangs
+#
+
+--echo
+--echo --------------------------------------------------------------------
+--echo -- Test for BUG#12751
+--echo --------------------------------------------------------------------
+
+# Give some time to begin accepting connections after restart.
+# FIXME: race condition here.
+
+--sleep 3
+
+# 1. Start mysqld;
+
+START INSTANCE mysqld2;
+# FIXME: START INSTANCE should be synchronous.
+--exec $MYSQL_TEST_DIR/t/wait_for_process.sh $IM_MYSQLD2_PATH_PID 30 started
+
+# 2. Restart IM-main: kill it and IM-angel will restart it.
+
+--exec $MYSQL_TEST_DIR/t/kill_n_check.sh $IM_PATH_PID restarted 30
+
+# 3. Issue some statement -- connection should be re-established.
+
+# Give some time to begin accepting connections after restart.
+# FIXME: race condition here.
+
+--sleep 3
+
+--replace_column 3 VERSION
+SHOW INSTANCE STATUS mysqld1;
+
+# 4. Stop mysqld2, because it will not be stopped by IM, as it is nonguarded.
+# So, if it we do not stop it, it will be stopped by mysql-test-run.pl with
+# warning.
+
+STOP INSTANCE mysqld2;
+# FIXME: STOP INSTANCE should be synchronous.
+--exec $MYSQL_TEST_DIR/t/wait_for_process.sh $IM_MYSQLD2_PATH_PID 30 stopped

server-tools/instance-manager/listener.cc

@@ -36,6 +36,27 @@
 #include "portability.h"
 
 
+static void set_non_blocking(int socket)
+{
+#ifndef __WIN__
+  int flags= fcntl(socket, F_GETFL, 0);
+  fcntl(socket, F_SETFL, flags | O_NONBLOCK);
+#else
+  u_long arg= 1;
+  ioctlsocket(socket, FIONBIO, &arg);
+#endif
+}
+
+
+static void set_no_inherit(int socket)
+{
+#ifndef __WIN__
+  int flags= fcntl(socket, F_GETFD, 0);
+  fcntl(socket, F_SETFD, flags | FD_CLOEXEC);
+#endif
+}
+
+
 /*
   Listener_thread - incapsulates listening functionality
 */
@@ -157,6 +178,8 @@ void Listener_thread::run()
         /* accept may return -1 (failure or spurious wakeup) */
         if (client_fd >= 0)                    // connection established
         {
+          set_no_inherit(client_fd);
+
           Vio *vio= vio_new(client_fd, socket_index == 0 ?
                             VIO_TYPE_SOCKET : VIO_TYPE_TCPIP,
                             socket_index == 0 ? 1 : 0);
@@ -198,25 +221,6 @@ void Listener_thread::run()
   return;
 }
 
-void set_non_blocking(int socket)
-{
-#ifndef __WIN__
-  int flags= fcntl(socket, F_GETFL, 0);
-  fcntl(socket, F_SETFL, flags | O_NONBLOCK);
-#else
-  u_long arg= 1;
-  ioctlsocket(socket, FIONBIO, &arg);
-#endif
-}
-
-void set_no_inherit(int socket)
-{
-#ifndef __WIN__
-  int flags= fcntl(socket, F_GETFD, 0);
-  fcntl(socket, F_SETFD, flags | FD_CLOEXEC);
-#endif
-}
-
 int Listener_thread::create_tcp_socket()
 {
   /* value to be set by setsockopt */