From d4a09f4ca993b92876a0f8dbfeb7d4962bb35de1 Mon Sep 17 00:00:00 2001
From: Guillaume Valadon <guillaume.valadon@ssi.gouv.fr>
Date: Thu, 3 Nov 2016 10:39:22 +0100
Subject: [PATCH] top sniff() on empty s.recv()
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- improved from Mattias Ahlbäck original patch
---
 scapy/sendrecv.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/scapy/sendrecv.py b/scapy/sendrecv.py
index d94f88a6c..516262c87 100644
--- a/scapy/sendrecv.py
+++ b/scapy/sendrecv.py
@@ -608,7 +608,10 @@ interfaces)
             sel = select(sniff_sockets, [], [], remain)
             for s in sel[0]:
                 p = s.recv()
-                if p is not None:
+                if p is None and offline is not None:
+                    stop_event = True
+                    break
+                elif p is not None:
                     if lfilter and not lfilter(p):
                         continue
                     if s in label: