ttcn3-tcpdump*.sh: Log stderr separately to file
The old output is preserved, too, in order to ensure
compatibility with expectations regarding legacy behavior.
Related: OS#5736
Change-Id: Ia92ff32c8ce09ab7805c5509837ec88fa4b864c5
diff --git a/ttcn3-tcpdump-start.sh b/ttcn3-tcpdump-start.sh
index 8bba72f..aa42e62 100755
--- a/ttcn3-tcpdump-start.sh
+++ b/ttcn3-tcpdump-start.sh
@@ -71,9 +71,28 @@
PID=$!
echo $PID > $PIDFILE_NETCAT
-$CMD -s 1500 -n -i any -w "$TTCN3_PCAP_PATH/$TESTCASE.pcap" >$TTCN3_PCAP_PATH/$TESTCASE.pcap.stdout 2>&1 &
+CMD_OUTFILE=$TTCN3_PCAP_PATH/$TESTCASE.pcap.stdout
+CMD_OUTFILE_ERR=$TTCN3_PCAP_PATH/$TESTCASE.pcap.stderr
+FIFO=/tmp/cmderr
+if ! [ -e $FIFO ]; then
+ mkfifo $FIFO
+else
+ echo "Warning: Named pipe already exists: $FIFO"
+fi
+
+# Log stderr to CMD_OUTFILE and a dedicated error log file
+tee $CMD_OUTFILE < $FIFO > $CMD_OUTFILE_ERR &
+CMD_STR="$CMD -s 1500 -n -i any -w \"$TTCN3_PCAP_PATH/$TESTCASE.pcap\" >$CMD_OUTFILE 2>$FIFO &"
+eval $CMD_STR
+# $CMD -s 1500 -n -i any -w \"$TTCN3_PCAP_PATH/$TESTCASE.pcap\" >$CMD_OUTFILE &
PID=$!
echo $PID > $PIDFILE_PCAP
+if [ -f $CMD_OUTFILE_ERR ] && [ $(wc -l $CMD_OUTFILE_ERR | awk '{print $1}') -ne 0 ]; then
+ echo "Warnings or error messages from command:" >&2
+ echo " $CMD_STR" >&2
+ echo "Message:" >&2
+ echo "$(cat $CMD_OUTFILE_ERR)" | sed 's/^/\t/' >&2
+fi
# Wait until packet dumper creates the pcap file and starts recording.
# We generate some traffic until we see packet dumper catches it.