c: handle exception during initialization

c/opendht.cpp

@@ -265,13 +265,19 @@ void dht_runner_delete(dht_runner* runner) {
     delete reinterpret_cast<dht::DhtRunner*>(runner);
 }
 
-void dht_runner_run(dht_runner* r, in_port_t port) {
+int dht_runner_run(dht_runner* r, in_port_t port) {
     auto runner = reinterpret_cast<dht::DhtRunner*>(r);
+    try {
         runner->run(port, {}, true);
+    } catch(...) {
+        return ENOTCONN;
+    }
+    return 0;
 }
 
-void dht_runner_run_config(dht_runner* r, in_port_t port, const dht_runner_config* conf) {
+int dht_runner_run_config(dht_runner* r, in_port_t port, const dht_runner_config* conf) {
     auto runner = reinterpret_cast<dht::DhtRunner*>(r);
+    try {
         dht::DhtRunner::Config config;
         config.dht_config.node_config.is_bootstrap = conf->dht_config.node_config.is_bootstrap;
         config.dht_config.node_config.maintain_storage = conf->dht_config.node_config.maintain_storage;
@@ -293,6 +299,10 @@ void dht_runner_run_config(dht_runner* r, in_port_t port, const dht_runner_confi
         config.peer_discovery = conf->peer_discovery;
         config.peer_publish = conf->peer_publish;
         runner->run(port, config);
+    } catch(...) {
+        return ENOTCONN;
+    }
+    return 0;
 }
 
 void dht_runner_ping(dht_runner* r, struct sockaddr* addr, socklen_t addr_len) {

c/opendht_c.h

@@ -137,8 +137,10 @@ struct OPENDHT_C_PUBLIC dht_runner;
 typedef struct dht_runner dht_runner;
 OPENDHT_C_PUBLIC dht_runner* dht_runner_new(void);
 OPENDHT_C_PUBLIC void dht_runner_delete(dht_runner* runner);
-OPENDHT_C_PUBLIC void dht_runner_run(dht_runner* runner, in_port_t port);
-OPENDHT_C_PUBLIC void dht_runner_run_config(dht_runner* runner, in_port_t port, const dht_runner_config* config);
+/* Returns 0 on success, standard error code on failure */
+OPENDHT_C_PUBLIC int dht_runner_run(dht_runner* runner, in_port_t port);
+/* Returns 0 on success, standard error code on failure */
+OPENDHT_C_PUBLIC int dht_runner_run_config(dht_runner* runner, in_port_t port, const dht_runner_config* config);
 OPENDHT_C_PUBLIC void dht_runner_ping(dht_runner* runner, struct sockaddr* addr, socklen_t addr_len);
 OPENDHT_C_PUBLIC void dht_runner_bootstrap(dht_runner* runner, const char* host, const char* service);
 OPENDHT_C_PUBLIC void dht_runner_get(dht_runner* runner, const dht_infohash* hash, dht_get_cb cb, dht_done_cb done_cb, void* cb_user_data);