Introduce JUICE_ERR_{AGAIN,TOO_LARGE}

Add new error codes JUICE_ERR_AGAIN and JUICE_ERR_TOO_LARGE,
which can represent more detailed result of juice_send.
Then update juice_send(_diffserv) to return them.

Author: mojyack

include/juice/juice.h

@@ -41,6 +41,8 @@ extern "C" {
 #define JUICE_ERR_FAILED -2    // runtime error
 #define JUICE_ERR_NOT_AVAIL -3 // element not available
 #define JUICE_ERR_IGNORED -4   // ignored
+#define JUICE_ERR_AGAIN -5     // buffer full
+#define JUICE_ERR_TOO_LARGE -6 // datagram too large
 
 // ICE Agent
 

src/juice.c

@@ -85,23 +85,21 @@ JUICE_EXPORT int juice_set_remote_gathering_done(juice_agent_t *agent) {
 }
 
 JUICE_EXPORT int juice_send(juice_agent_t *agent, const char *data, size_t size) {
-	if (!agent || (!data && size))
-		return JUICE_ERR_INVALID;
-
-	if (agent_send(agent, data, size, 0) < 0)
-		return JUICE_ERR_FAILED;
-
-	return JUICE_ERR_SUCCESS;
+	return juice_send_diffserv(agent, data, size, 0);
 }
 
 JUICE_EXPORT int juice_send_diffserv(juice_agent_t *agent, const char *data, size_t size, int ds) {
 	if (!agent || (!data && size))
 		return JUICE_ERR_INVALID;
 
-	if (agent_send(agent, data, size, ds) < 0)
-		return JUICE_ERR_FAILED;
-
-	return JUICE_ERR_SUCCESS;
+	int ret = agent_send(agent, data, size, ds);
+	if(ret >= 0)
+		return JUICE_ERR_SUCCESS;
+	if(ret == -SEAGAIN || ret == -SEWOULDBLOCK)
+		return JUICE_ERR_AGAIN;
+	if(ret == -SEMSGSIZE)
+		return JUICE_ERR_TOO_LARGE;
+	return JUICE_ERR_FAILED;
 }
 
 JUICE_EXPORT juice_state_t juice_get_state(juice_agent_t *agent) { return agent_get_state(agent); }