Improve struct packing.

lib/mosquitto_internal.h

@@ -215,6 +215,7 @@ struct mosquitto {
 #ifndef WITH_BROKER
 	mosq_sock_t sockpairR, sockpairW;
 #endif
+	uint32_t maximum_packet_size;
 #if defined(__GLIBC__) && defined(WITH_ADNS)
 	struct gaicb *adns; /* For getaddrinfo_a */
 #endif
@@ -236,7 +237,6 @@ struct mosquitto {
 	struct mosquitto__alias *aliases;
 	struct will_delay_list *will_delay_entry;
 	int alias_count;
-	uint32_t maximum_packet_size;
 	uint32_t will_delay_interval;
 	time_t will_delay_time;
 #ifdef WITH_TLS
@@ -274,8 +274,8 @@ struct mosquitto {
 	pthread_t thread_id;
 #endif
 	bool clean_start;
-	uint32_t session_expiry_interval;
 	time_t session_expiry_time;
+	uint32_t session_expiry_interval;
 #ifdef WITH_BROKER
 	bool removed_from_by_id; /* True if removed from by_id hash */
 	bool is_dropping;
@@ -291,7 +291,9 @@ struct mosquitto {
 	char *auth_method;
 	int sub_count;
 	int shared_sub_count;
+#  ifndef WITH_EPOLL
 	int pollfd_index;
+#  endif
 #  ifdef WITH_WEBSOCKETS
 	struct lws *wsi;
 #  endif

src/context.c

@@ -42,8 +42,9 @@ struct mosquitto *context__init(mosq_sock_t sock)
 	
 #ifdef WITH_EPOLL
 	context->ident = id_client;
-#endif
+#else
 	context->pollfd_index = -1;
+#endif
 	mosquitto__set_state(context, mosq_cs_new);
 	context->sock = sock;
 	context->last_msg_in = db.now_s;

src/mosquitto_broker_internal.h

@@ -241,8 +241,8 @@ struct mosquitto__listener_sock{
 	/* This *must* be the first element in the struct. */
 	int ident;
 #endif
-	struct mosquitto__listener *listener;
 	mosq_sock_t sock;
+	struct mosquitto__listener *listener;
 };
 
 typedef struct mosquitto_plugin_id_t{
@@ -372,11 +372,11 @@ struct mosquitto_msg_store{
 	void *payload;
 	time_t message_expiry_time;
 	uint32_t payloadlen;
+	enum mosquitto_msg_origin origin;
 	uint16_t source_mid;
 	uint16_t mid;
 	uint8_t qos;
 	bool retain;
-	enum mosquitto_msg_origin origin;
 };
 
 struct mosquitto_client_msg{

src/websockets.c

@@ -188,7 +188,9 @@ static int callback_mqtt(
 				if(mosq->sock != INVALID_SOCKET){
 					HASH_DELETE(hh_sock, db.contexts_by_sock, mosq);
 					mosq->sock = INVALID_SOCKET;
+#ifndef WITH_EPOLL
 					mosq->pollfd_index = -1;
+#endif
 					mux__delete(mosq);
 				}
 				mosq->wsi = NULL;