ttcn3-tcpdump-stop.sh: Wait to receive last packets before stopping tcpdump
There's a time delay between packets are sent through the system and
tcpdump reads, buffers and stores them into the pcap file. We need to
give it more time to process everything before killing it, otherwise
last (or all) packets from the test are not captured.
Change-Id: I240d8f1bdb2ca6ad353e60ef15937dc2bd4cbebd
diff --git a/ttcn3-tcpdump-stop.sh b/ttcn3-tcpdump-stop.sh
index 575c0ef..a085bf7 100755
--- a/ttcn3-tcpdump-stop.sh
+++ b/ttcn3-tcpdump-stop.sh
@@ -1,6 +1,25 @@
#!/bin/sh
PIDFILE=/tmp/tcpdump.pid
+TESTCASE=$1
+
+if [ "z$TTCN3_PCAP_PATH" = "z" ]; then
+ TTCN3_PCAP_PATH=/tmp
+fi
+
+# Wait for up to 2 seconds if we keep receiving traffinc from tcpdump,
+# otherwise we might lose last packets from test.
+i=0
+prev_count=-1
+count=$(stat --format="%s" "$TTCN3_PCAP_PATH/$TESTCASE.pcap")
+while [ $count -gt $prev_count ] && [ $i -lt 2 ]
+do
+ echo "Waiting for tcpdump to finish... $i (prev_count=$prev_count, count=$count)"
+ sleep 1
+ prev_count=$count
+ count=$(stat --format="%s" "$TTCN3_PCAP_PATH/$TESTCASE.pcap")
+ i=$((i+1))
+done
if [ -e $PIDFILE ]; then
# NOTE: This requires you to be root or something like