Coin: Tweak VxWorks testrunner

Add crash handling to avoid waiting until 10min timeout on each crash.
Force restart on each crash by killing emulator.

Make health check more robust to allow it to work even when emulator is
down. This is done via wait in separate process which cannot be done
with normal timeout command, as input to pipe that is not being read
by emulator will block forever.

Change-Id: I86c3c86f936cc96d57b38983da48d1d73162399d
Reviewed-by: Simo Fält <simo.falt@qt.io>
(cherry picked from commit 918cbe7601b07fa6db7973ff9a4f76208dae8f22)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

coin/instructions/vxworks_testrunner.yaml

@@ -22,11 +22,17 @@ instructions:
 
       # qtest_in_vxworks_complete echo is used to detect test process completion as it will
       # be echoed after test process ends normally or crashes when normal log lines are not present.
+
       # Check that emulator is functioning
-      echo "cmd echo \"health check\"" > /tmp/guest.in
-      sleep 0.5
-      read -t 5 echoline</tmp/guest.out
-      read -t 1 testline</tmp/guest.out
+      ( echo "cmd echo \"health check\"" > /tmp/guest.in ) & pid=$!
+      ( sleep 5 && kill -HUP $pid ) 2>/dev/null & watcher=$!
+      wait $pid 2>/dev/null && pkill -HUP -P $watcher
+
+      if [[ "$?" -eq "0" ]]; then
+          read -t 5 echoline</tmp/guest.out
+          read -t 1 testline</tmp/guest.out
+      fi
+
       if [[ -z "$testline" ]]; then
           echo "Restarting  stuck emulator"
           pkill qemu-system
@@ -58,4 +64,16 @@ instructions:
               exitcode=$(echo "$line" | sed -nr 's/qtest_in_vxworks_complete: (-?[0-9]+)/\1/gp' | tr -d '\r')
               exit $exitcode
           fi
+
+          # Handle crashes
+          if echo "$line" | /usr/bin/grep -qE "(SIGSEGV)|(SIGABRT)"
+          then
+              # Empty output pipe
+              while read -t 1 line; do
+                  echo $line
+              done < /tmp/guest.out
+              echo "Test crashed"
+              pkill qemu-system  # Kill emulator to force restart on next test start
+              exit 1
+          fi
       done < /tmp/guest.out