Handle EPIPE as a common connection close event.

proto/bgp/bgp.c

@@ -434,6 +434,15 @@ bgp_sock_err(sock *sk, int err)
   struct bgp_conn *conn = sk->data;
   struct bgp_proto *p = conn->bgp;
 
+  /*
+   * This error hook may be called either asynchronously from main
+   * loop, or synchronously from sk_send().  But sk_send() is called
+   * only from bgp_tx() and bgp_kick_tx(), which are both called
+   * asynchronously from main loop. Moreover, they end if err hook is
+   * called. Therefore, we could suppose that it is always called
+   * asynchronously.
+   */
+
   bgp_store_error(p, conn, BE_SOCKET, err);
 
   if (err)

proto/bgp/packets.c

@@ -594,7 +594,7 @@ bgp_kick_tx(void *vconn)
   struct bgp_conn *conn = vconn;
 
   DBG("BGP: kicking TX\n");
-  while (bgp_fire_tx(conn))
+  while (bgp_fire_tx(conn) > 0)
     ;
 }
 
@@ -604,7 +604,7 @@ bgp_tx(sock *sk)
   struct bgp_conn *conn = sk->data;
 
   DBG("BGP: TX hook\n");
-  while (bgp_fire_tx(conn))
+  while (bgp_fire_tx(conn) > 0)
     ;
 }
 

sysdep/unix/io.c

@@ -1216,7 +1216,8 @@ sk_maybe_write(sock *s)
 	      if (errno != EINTR && errno != EAGAIN)
 		{
 		  reset_tx_buffer(s);
-		  s->err_hook(s, errno);
+		  /* EPIPE is just a connection close notification during TX */
+		  s->err_hook(s, (errno != EPIPE) ? errno : 0);
 		  return -1;
 		}
 	      return 0;