[PATCH] osmo-ttcn3-hacks[master]: ttcn3-tcpdump-stop.sh: Wait to receive last packets before s...

Pau Espin Pedrol gerrit-no-reply at lists.osmocom.org
Thu Feb 15 15:11:32 UTC 2018

Review at  https://gerrit.osmocom.org/6483

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
M ttcn3-tcpdump-stop.sh
1 file changed, 20 insertions(+), 0 deletions(-)

  git pull ssh://gerrit.osmocom.org:29418/osmo-ttcn3-hacks refs/changes/83/6483/1

diff --git a/ttcn3-tcpdump-stop.sh b/ttcn3-tcpdump-stop.sh
index 575c0ef..0c6057d 100755
--- a/ttcn3-tcpdump-stop.sh
+++ b/ttcn3-tcpdump-stop.sh
@@ -1,6 +1,26 @@
+if [ "z$TTCN3_PCAP_PATH" = "z" ]; then
+# Wait for up to 2 seconds if we keep receiving traffinc from tcpdump,
+# otherwise we might lose last packets from test.
+count=$($TCPDUMP -r "$TTCN3_PCAP_PATH/$TESTCASE.pcap" 2>/dev/null | wc -l)
+while [ $count -gt $prev_count ] && [ $i -lt 2 ]
+	echo "Waiting for tcpdump to finish... $i (prev_count=$prev_count, count=$count)"
+	sleep 1
+	prev_count=$count
+	count=$($TCPDUMP -r "$TTCN3_PCAP_PATH/$TESTCASE.pcap" 2>/dev/null | wc -l)
+	i=$((i+1))
 if [ -e $PIDFILE ]; then
 	# NOTE: This requires you to be root or something like

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Gerrit-MessageType: newchange
Gerrit-Change-Id: I240d8f1bdb2ca6ad353e60ef15937dc2bd4cbebd
Gerrit-PatchSet: 1
Gerrit-Project: osmo-ttcn3-hacks
Gerrit-Branch: master
Gerrit-Owner: Pau Espin Pedrol <pespin at sysmocom.de>

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