port: Convey targeted forwarding errors to the caller.

The port_forward_to() method clobbers the specific error code returned by the transport layer with -1. This patch lets the code preserve the specific error in question. Signed-off-by: Richard Cochran <[email protected]>
j5207 · May 24, 2020 · 5aa19dd · 5aa19dd
1 parent a6e0b83
commit 5aa19dd
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Showing 2 changed files with 5 additions and 3 deletions.
diff --git a/port.c b/port.c
@@ -2737,8 +2737,10 @@ int port_forward_to(struct port *p, struct ptp_message *msg)
 {
 	int cnt;
 	cnt = transport_sendto(p->trp, &p->fda, TRANS_GENERAL, msg);
-	if (cnt <= 0) {
-		return -1;
+	if (cnt < 0) {
+		return cnt;
+	} else if (!cnt) {
+		return -EIO;
 	}
 	port_stats_inc_tx(p, msg);
 	return 0;

diff --git a/port.h b/port.h
@@ -94,7 +94,7 @@ int port_forward(struct port *p, struct ptp_message *msg);
  * Forward a message on a given port to the address stored in the message.
  * @param port    A pointer previously obtained via port_open().
  * @param msg     The message to send. Must be in network byte order.
- * @return        Zero on success, non-zero otherwise.
+ * @return        Zero on success, negative errno value otherwise.
  */
 int port_forward_to(struct port *p, struct ptp_message *msg);