ring: check return value of setsockopt

If something screws up, which is rather unlikely, but if it happens,
let the user know.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>

2 files changed, 14 insertions, 4 deletions

diff --git a/ring_rx.c b/ring_rx.c
index c4c6a38..4c5846c 100644
--- a/ring_rx.c
+++ b/ring_rx.c
@@ -21,9 +21,14 @@
 
 void destroy_rx_ring(int sock, struct ring *ring)
 {
+	int ret;
+
 	fmemset(&ring->layout, 0, sizeof(ring->layout));
-	setsockopt(sock, SOL_PACKET, PACKET_RX_RING, &ring->layout,
-		   sizeof(ring->layout));
+
+	ret = setsockopt(sock, SOL_PACKET, PACKET_RX_RING, &ring->layout,
+			 sizeof(ring->layout));
+	if (unlikely(ret))
+		panic("Cannot destroy the RX_RING!\n");
 
 	munmap(ring->mm_space, ring->mm_len);
 	ring->mm_len = 0;
diff --git a/ring_tx.c b/ring_tx.c
index dc777e5..9869131 100644
--- a/ring_tx.c
+++ b/ring_tx.c
@@ -31,9 +31,14 @@ void set_packet_loss_discard(int sock)
 
 void destroy_tx_ring(int sock, struct ring *ring)
 {
+	int ret;
+
 	fmemset(&ring->layout, 0, sizeof(ring->layout));
-	setsockopt(sock, SOL_PACKET, PACKET_TX_RING, &ring->layout,
-		   sizeof(ring->layout));
+
+	ret = setsockopt(sock, SOL_PACKET, PACKET_TX_RING, &ring->layout,
+			 sizeof(ring->layout));
+	if (unlikely(ret))
+		panic("Cannot destroy the TX_RING!\n");
 
 	munmap(ring->mm_space, ring->mm_len);
 	ring->mm_len = 0;