[dpdk-dev] [PATCH] rte_vhost: do not treat empty socket message as error

Vitaliy Mysak vitaliy.mysak at intel.com
Wed Jan 29 10:22:03 CET 2020


According to recvmsg() specification, 0 is a valid
return code when client is disconnecting.
Therefore, it should not be reported as error, unless there
are other dependencies that require message to not be empty.
But there are none, since the next immediate caller of recvmsg()
reports "vhost peer closed" info (not error) when message is empty.

This patch changes return code check for recvmsg() so that
misleading error message is not printed when the code is 0.

Signed-off-by: Vitaliy Mysak <vitaliy.mysak at intel.com>
---
 lib/librte_vhost/socket.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/librte_vhost/socket.c b/lib/librte_vhost/socket.c
index 9740fb340..0cac3ce8e 100644
--- a/lib/librte_vhost/socket.c
+++ b/lib/librte_vhost/socket.c
@@ -127,7 +127,8 @@ read_fd_message(int sockfd, char *buf, int buflen, int *fds, int max_fds,
 
 	ret = recvmsg(sockfd, &msgh, 0);
 	if (ret <= 0) {
-		VHOST_LOG_CONFIG(ERR, "recvmsg failed\n");
+		if (ret)
+			VHOST_LOG_CONFIG(ERR, "recvmsg failed\n");
 		return ret;
 	}
 
-- 
2.17.1

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