https://jira.fd.io/browse/GOVPP-21

Signed-off-by: Kusakabe Si <linux@kskb.eu.org>
Change-Id: Ib1761e3b93dae70680646ce7fdd78a1168fd0b9f

2 files changed, 19 insertions, 1 deletions

diff --git a/extras/libmemif/adapter.go b/extras/libmemif/adapter.go
index eb7e209..ac8a827 100644
--- a/extras/libmemif/adapter.go
+++ b/extras/libmemif/adapter.go
@@ -380,6 +380,7 @@ type Memif struct {
 
 	// Interrupt
 	intCh      chan uint8      // memif-global interrupt channel (value = queue ID)
+	intErrCh   chan error      // triggered when interrupt error occurs
 	queueIntCh []chan struct{} // per RX queue interrupt channel
 
 	// Rx/Tx queues
@@ -585,6 +586,7 @@ func CreateInterface(config *MemifConfig, callbacks *MemifCallbacks) (memif *Mem
 
 	// Initialize memif-global interrupt channel.
 	memif.intCh = make(chan uint8, 1<<6)
+	memif.intErrCh = make(chan error, 1<<6)
 
 	// Initialize event file descriptor for stopping Rx/Tx queue polling.
 	memif.stopQPollFd = int(C.eventfd(0, C.EFD_NONBLOCK))
@@ -667,6 +669,12 @@ func (memif *Memif) GetInterruptChan() (ch <-chan uint8 /* queue ID */) {
 	return memif.intCh
 }
 
+// GetInterruptErrorChan returns an Error channel
+// which fires if there are errors occurred while read data.
+func (memif *Memif) GetInterruptErrorChan() (ch <-chan error /* The error */) {
+	return memif.intErrCh
+}
+
 // GetQueueInterruptChan returns an empty-data channel which fires every time
 // there are data to read on a given queue.
 // It is only valid to call this function if memif is in the connected state.
@@ -1022,6 +1030,7 @@ func (memif *Memif) Close() error {
 	if err != nil {
 		// Close memif-global interrupt channel.
 		close(memif.intCh)
+		close(memif.intErrCh)
 		// Close file descriptor stopQPollFd.
 		C.close(C.int(memif.stopQPollFd))
 	}
@@ -1163,6 +1172,7 @@ func pollRxQueue(memif *Memif, queueID uint8) {
 				continue
 			}
 			log.WithField("err", err).Error("epoll_wait() failed")
+			memif.intErrCh <- err
 			return
 		}
 
diff --git a/extras/libmemif/examples/icmp-responder/icmp-responder.go b/extras/libmemif/examples/icmp-responder/icmp-responder.go
index 79bb9d0..a7726bf 100644
--- a/extras/libmemif/examples/icmp-responder/icmp-responder.go
+++ b/extras/libmemif/examples/icmp-responder/icmp-responder.go
@@ -399,5 +399,13 @@ func main() {
 	// Wait until an interrupt signal is received.
 	sigChan := make(chan os.Signal, 1)
 	signal.Notify(sigChan, os.Interrupt)
-	<-sigChan
+	var intErrch = memif.GetInterruptErrorChan()
+	select {
+	case err = <-intErrch:
+		fmt.Printf("Exit due to interface error: %v\n", err)
+		return
+	case <-sigChan:
+		fmt.Printf("Exit by os.Interrupt")
+		return
+	}
 }