add backlock socket context option for stream_socket_server(),

which had a hardcoded backlog of 5 at two occurrances

main/streams/transports.c

@@ -157,7 +157,20 @@ PHPAPI php_stream *_php_stream_xport_create(const char *name, long namelen, int
 					ERR_RETURN(error_string, error_text, "bind() failed: %s");
 					failed = 1;
 				} else if (flags & STREAM_XPORT_LISTEN) {
-					if (0 != php_stream_xport_listen(stream, 5, &error_text TSRMLS_CC)) {
+					zval **zbacklog = NULL;
+					int backlog = 32;
+					
+					if (stream->context && php_stream_context_get_option(stream->context, "socket", "backlog", &zbacklog) == SUCCESS) {
+						zval *ztmp = *zbacklog;
+						
+						convert_to_long_ex(&ztmp);
+						backlog = Z_LVAL_P(ztmp);
+						if (ztmp != *zbacklog) {
+							zval_ptr_dtor(&ztmp);
+						}
+					}
+					
+					if (0 != php_stream_xport_listen(stream, backlog, &error_text TSRMLS_CC)) {
 						ERR_RETURN(error_string, error_text, "listen() failed: %s");
 						failed = 1;
 					}

main/streams/xp_socket.c

@@ -324,7 +324,7 @@ static int php_sockop_set_option(php_stream *stream, int option, int value, void
 
 			switch (xparam->op) {
 				case STREAM_XPORT_OP_LISTEN:
-					xparam->outputs.returncode = (listen(sock->socket, 5) == 0) ?  0: -1;
+					xparam->outputs.returncode = (listen(sock->socket, xparam->inputs.backlog) == 0) ?  0: -1;
 					return PHP_STREAM_OPTION_RETURN_OK;
 
 				case STREAM_XPORT_OP_GET_NAME: