nl: Return -NLE_AGAIN if non-blocking socket would block

Previously 0 was returned which gave the caller no chance of detecting
when a non-blocking socket would block. If a caller intends to never
see an error message it should utilize poll()/select() to only read
when the socket has pending data or information.

Reported-by: Holger Eitzenberger <holger@eitzenberger.org>
Signed-off-by: Thomas Graf <tgraf@suug.ch>

1 files changed, 0 insertions, 5 deletions

diff --git a/lib/nl.c b/lib/nl.c
index fa43c56..0445e35 100644
--- a/lib/nl.c
+++ b/lib/nl.c
@@ -627,11 +627,6 @@ retry:
 			NL_DBG(3, "recvmsg() returned EINTR, retrying\n");
 			goto retry;
 		}
-		if (errno == EAGAIN || errno == EWOULDBLOCK) {
-			NL_DBG(3, "recvmsg() returned EAGAIN||EWOULDBLOCK, aborting\n");
-			retval = 0;
-			goto abort;
-		}
 		retval = -nl_syserr2nlerr(errno);
 		goto abort;
 	}