[Qemu-devel] [PATCH v3 2/1] libqtest: add more exit status checks

["Michael S. Tsirkin" <mst@redhat.com>]

Add more checks on how did QEMU exit.

Legal ways to exit right now:
- exit(0) or return from main
- kill(SIGTERM) - sent by testing infrastructure

Anything else is illegal.

Include explicit asserts on bad behaviour encountered
to make debugging easier.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---

Changes from v2:
- bugfix
- assert returned pid
- rework complex asserts for clarity

Changes from v1:
- drop SIGTERM as suggested by Eric

 tests/libqtest.c | 5 +++++


 tests/libqtest.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/tests/libqtest.c b/tests/libqtest.c
index f869854..36ca859 100644
--- a/tests/libqtest.c
+++ b/tests/libqtest.c
@@ -109,9 +109,19 @@ static void kill_qemu(QTestState *s)
         kill(s->qemu_pid, SIGTERM);
         pid = waitpid(s->qemu_pid, &wstatus, 0);
 
-        if (pid == s->qemu_pid && WIFSIGNALED(wstatus)) {
+        /* waitpid returns child PID on success */
+        assert(pid == s->qemu_pid);
+
+        /* If exited on signal - check the reason: core dump is never OK */
+        if (WIFSIGNALED(wstatus)) {
             assert(!WCOREDUMP(wstatus));
         }
+        /* If exited normally - check exit status */
+        if (WIFEXITED(wstatus)) {
+            assert(!WEXITSTATUS(wstatus));
+        }
+        /* Valid ways to exit: right now only return from main or exit */
+        assert(WIFEXITED(wstatus));
     }
 }
 
-- 
MST