[core] new worker_init hook to follow parent fork

src/plugin.c

@@ -50,6 +50,7 @@ typedef enum {
 	PLUGIN_FUNC_INIT,
 	PLUGIN_FUNC_CLEANUP,
 	PLUGIN_FUNC_SET_DEFAULTS,
+	PLUGIN_FUNC_WORKER_INIT,
 
 	PLUGIN_FUNC_SIZEOF
 } plugin_t;
@@ -348,6 +349,7 @@ PLUGIN_TO_SLOT(PLUGIN_FUNC_HANDLE_TRIGGER, handle_trigger)
 PLUGIN_TO_SLOT(PLUGIN_FUNC_HANDLE_SIGHUP, handle_sighup)
 PLUGIN_TO_SLOT(PLUGIN_FUNC_CLEANUP, cleanup)
 PLUGIN_TO_SLOT(PLUGIN_FUNC_SET_DEFAULTS, set_defaults)
+PLUGIN_TO_SLOT(PLUGIN_FUNC_WORKER_INIT, worker_init)
 
 #undef PLUGIN_TO_SLOT
 
@@ -456,6 +458,7 @@ handler_t plugins_call_init(server *srv) {
 		PLUGIN_TO_SLOT(PLUGIN_FUNC_CONNECTION_RESET, connection_reset);
 		PLUGIN_TO_SLOT(PLUGIN_FUNC_CLEANUP, cleanup);
 		PLUGIN_TO_SLOT(PLUGIN_FUNC_SET_DEFAULTS, set_defaults);
+		PLUGIN_TO_SLOT(PLUGIN_FUNC_WORKER_INIT, worker_init);
 #undef PLUGIN_TO_SLOT
 
 		if (p->init) {

src/plugin.h

@@ -37,6 +37,7 @@ typedef struct {
 	void *(* init)                       ();
 	handler_t (* priv_defaults)          (server *srv, void *p_d);
 	handler_t (* set_defaults)           (server *srv, void *p_d);
+	handler_t (* worker_init)            (server *srv, void *p_d); /* at server startup (each worker after fork()) */
 	handler_t (* cleanup)                (server *srv, void *p_d);
 	                                                                                   /* is called ... */
 	handler_t (* handle_trigger)         (server *srv, void *p_d);                     /* once a second */
@@ -101,6 +102,9 @@ handler_t plugins_call_init(server *srv);
 __attribute_cold__
 handler_t plugins_call_set_defaults(server *srv);
 
+__attribute_cold__
+handler_t plugins_call_worker_init(server *srv);
+
 __attribute_cold__
 handler_t plugins_call_cleanup(server *srv);
 

src/server.c

@@ -1787,6 +1787,10 @@ static int server_main (server * const srv, int argc, char **argv) {
 		return -1;
 	}
 
+	/* plugin hook for worker_init */
+	if (HANDLER_GO_ON != plugins_call_worker_init(srv))
+		return -1;
+
 	if (oneshot_fd && server_oneshot_init(srv, oneshot_fd)) {
 		oneshot_fd = -1;
 	}