slightly better backends error handling

src/backend/evhttp.c

@@ -69,14 +69,14 @@ void tofu_backend_evhttp_loop(tofu_ctx_t *ctx) {
 	base = event_base_new();
 
 	if (!base) {
-		fprintf(stderr, "Couldn't create an event_base: exiting\n");
+		fprintf(stderr, "Err: couldn't create an event_base\n");
 		exit(-1);
 	}
 
 	http = evhttp_new(base);
 
 	if (!http) {
-		fprintf(stderr, "couldn't create evhttp. Exiting.\n");
+		fprintf(stderr, "Err: couldn't create evhttp.\n");
 		exit(-1);
 	}
 
@@ -85,7 +85,7 @@ void tofu_backend_evhttp_loop(tofu_ctx_t *ctx) {
 	handle = evhttp_bind_socket_with_handle(http, listen, port);
 
 	if (!handle) {
-		fprintf(stderr, "couldn't bind to port %d. Exiting.\n", port);
+		fprintf(stderr, "Err: couldn't bind to port %d.\n", port);
 		exit(-1);
 	}
 

src/backend/zmq.c

@@ -71,15 +71,31 @@ void tofu_backend_zmq_loop(tofu_ctx_t *ctx) {
 	zmq_pollitem_t items[1];
 	void *zmq_ctx = zmq_init(1);
 
+	if (!zmq_ctx) {
+		fprintf(stderr, "Err: couldn't create zmq context.\n");
+		exit(-1);
+	}
+
 	char *recv_spec  = ctx -> backend_opts[0];
 	char *recv_ident = ctx -> backend_opts[1];
 
 	char *send_spec  = ctx -> backend_opts[2];
 	char *send_ident = ctx -> backend_opts[3];
 
 	void *recv = zmq_socket(zmq_ctx, ZMQ_PULL);
+
+	if (!recv) {
+		fprintf(stderr, "Err: couldn't create zmq socket recv.\n");
+		exit(-1);
+	}
+
 	void *send = zmq_socket(zmq_ctx, ZMQ_PUB);
 
+	if (!send) {
+		fprintf(stderr, "Err: couldn't create zmq socket send.\n");
+		exit(-1);
+	}
+
 	zmq_connect(recv, recv_spec);
 	zmq_setsockopt(recv, ZMQ_IDENTITY, recv_ident, strlen(recv_ident));
 
@@ -107,7 +123,6 @@ void tofu_backend_zmq_loop(tofu_ctx_t *ctx) {
 			tofu_rep_free(rep);
 			tofu_req_free(req);
 
-			/*free(tnetstr);*/
 			zmq_msg_close(&msg);
 		}
 	}