Retrieve and store the hostname only once so multiple threads do not potentially initialize it at the same time.

........

Merged revisions 400245 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@400246 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_pjsip_session.c

@@ -48,6 +48,9 @@
 #define MOD_DATA_ON_RESPONSE "on_response"
 #define MOD_DATA_NAT_HOOK "nat_hook"
 
+/* Hostname used for origin line within SDP */
+static const pj_str_t *hostname;
+
 /* Some forward declarations */
 static void handle_incoming_request(struct ast_sip_session *session, pjsip_rx_data *rdata);
 static void handle_incoming_response(struct ast_sip_session *session, pjsip_rx_data *rdata);
@@ -1991,7 +1994,7 @@ static struct pjmedia_sdp_session *create_local_sdp(pjsip_inv_session *inv, stru
 	pj_strdup2(inv->pool, &local->origin.user, session->endpoint->media.sdpowner);
 	local->origin.net_type = STR_IN;
 	local->origin.addr_type = session->endpoint->media.rtp.ipv6 ? STR_IP6 : STR_IP4;
-	local->origin.addr = *pj_gethostname();
+	local->origin.addr = *hostname;
 	pj_strdup2(inv->pool, &local->name, session->endpoint->media.sdpsession);
 
 	/* Now let the handlers add streams of various types, pjmedia will automatically reorder the media streams for us */
@@ -2137,6 +2140,7 @@ static int load_module(void)
 	pjsip_inv_usage_init(endpt, &inv_callback);
 	pjsip_100rel_init_module(endpt);
 	pjsip_timer_init_module(endpt);
+	hostname = pj_gethostname();
 	if (ast_sip_register_service(&session_module)) {
 		return AST_MODULE_LOAD_DECLINE;
 	}