new file mode 100644
--- /dev/null
+++ b/src/core/ngx_config_command.c
@@ -0,0 +1,14 @@
+
+#include <ngx_config.h>
+
+char *ngx_conf_set_size_slot(char *conf, int offset, char *value)
+{
+    int size;
+
+    size = atoi(value);
+    if (size < 0)
+        return "value must be greater or equal to zero";
+
+    *(int *) (conf + offset) = size;
+    return NULL;
+}