MDEV-10383 Named pipes : multiple servers can listen on the same pipename

Use FILE_FLAG_FIRST_PIPE_INSTANCE with the first CreateNamedPipe()
call to make sure the pipe does not already exist.

mysql-test/t/named_pipe.test

@@ -22,3 +22,12 @@ connect(pipe_con,localhost,root,,,,,PIPE);
 
 connection default;
 disconnect pipe_con;
+
+# MDEV-10383 : check that other server cannot 'bind' on the same pipe
+let $MYSQLD_DATADIR= `select @@datadir`;
+--error  1
+--exec $MYSQLD_CMD --enable-named-pipe --skip-networking --log-error=second-mysqld.err
+let SEARCH_FILE=$MYSQLD_DATADIR/second-mysqld.err;
+let SEARCH_RANGE= -50;
+let SEARCH_PATTERN=\[ERROR\] Create named pipe failed;
+source include/search_pattern_in_file.inc;

sql/mysqld.cc

@@ -2316,26 +2316,17 @@ static void network_init(void)
     saPipeSecurity.lpSecurityDescriptor = &sdPipeDescriptor;
     saPipeSecurity.bInheritHandle = FALSE;
     if ((hPipe= CreateNamedPipe(pipe_name,
-				PIPE_ACCESS_DUPLEX|FILE_FLAG_OVERLAPPED,
-				PIPE_TYPE_BYTE |
-				PIPE_READMODE_BYTE |
-				PIPE_WAIT,
-				PIPE_UNLIMITED_INSTANCES,
-				(int) global_system_variables.net_buffer_length,
-				(int) global_system_variables.net_buffer_length,
-				NMPWAIT_USE_DEFAULT_WAIT,
-				&saPipeSecurity)) == INVALID_HANDLE_VALUE)
-      {
-	LPVOID lpMsgBuf;
-	int error=GetLastError();
-	FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
-		      FORMAT_MESSAGE_FROM_SYSTEM,
-		      NULL, error, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
-		      (LPTSTR) &lpMsgBuf, 0, NULL );
-	sql_perror((char *)lpMsgBuf);
-	LocalFree(lpMsgBuf);
-	unireg_abort(1);
-      }
+        PIPE_ACCESS_DUPLEX | FILE_FLAG_OVERLAPPED | FILE_FLAG_FIRST_PIPE_INSTANCE,
+        PIPE_TYPE_BYTE | PIPE_READMODE_BYTE | PIPE_WAIT,
+        PIPE_UNLIMITED_INSTANCES,
+        (int) global_system_variables.net_buffer_length,
+        (int) global_system_variables.net_buffer_length,
+        NMPWAIT_USE_DEFAULT_WAIT,
+        &saPipeSecurity)) == INVALID_HANDLE_VALUE)
+    {
+      sql_perror("Create named pipe failed");
+      unireg_abort(1);
+    }
   }
 #endif