prepare for before_privileges_drop plugins

core/utils.c

@@ -636,6 +636,14 @@ void uwsgi_as_root() {
 
 		}
 
+		// ok try to call some special hook before finally dropping privileges
+		int i;
+		for (i = 0; i < uwsgi.gp_cnt; i++) {
+                	if (uwsgi.gp[i]->before_privileges_drop) {
+                        	uwsgi.gp[i]->before_privileges_drop();
+                	}
+        	}
+
 		if (uwsgi.gid) {
 			if (!uwsgi.master_as_root)
 				uwsgi_log("setgid() to %d\n", uwsgi.gid);

uwsgi.h

@@ -690,6 +690,7 @@ struct uwsgi_plugin {
 	uint16_t(*rpc) (void *, uint8_t, char **, uint16_t *, char *);
 
 	void (*jail) (int (*)(void *), char **);
+	void (*before_privileges_drop)(void);
 
 	int (*mule)(char *);
 	int (*mule_msg)(char *, size_t);