Fix: Avoid returning negative value that's stop watch socket

Even if the frame read is wrong doesn't mean that socket is compromise only
that communication on CAN bus is difficult, maybe temporary. On en EPOLL err
code, or hangup, just close and restart the socket and reset the filter.

Change-Id: I61f146fd269bb2524f09e1f2ed89d93e83166136
Signed-off-by: Romain Forlot <romain.forlot@iot.bzh>

1 files changed, 10 insertions, 3 deletions

diff --git a/CAN-binder/low-can-binding/binding/low-can-cb.cpp b/CAN-binder/low-can-binding/binding/low-can-cb.cpp
index 414fa91..2183893 100644
--- a/CAN-binder/low-can-binding/binding/low-can-cb.cpp
+++ b/CAN-binder/low-can-binding/binding/low-can-cb.cpp
@@ -55,9 +55,16 @@ void on_no_clients(std::string message)
 int read(sd_event_source *s, int fd, uint32_t revents, void *userdata)
 {
 	can_signal_t* sig= (can_signal_t*)userdata;
-	if(sig->read_socket() != can_message_format_t::ERROR)
-		return 0;
-	return -1;
+	sig->read_socket();
+
+	/* check if error or hangup */
+	if ((revents & (EPOLLERR|EPOLLRDHUP|EPOLLHUP)) != 0)
+	{
+		sd_event_source_unref(s);
+		sig->get_socket().close();
+		sig->create_rx_filter();
+	}
+	return 0;
 }
 
 ///******************************************************************************