[PATCH] tests/qtest: Poll on waitpid() for a while before sending SIGKILL

[Stefan Berger]

To prevent getting stuck on waitpid() in case the target process does
not terminate on SIGTERM, poll on waitpid() for 10s and if the target
process has not changed state until then send a SIGKILL to it.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 tests/qtest/libqtest.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/tests/qtest/libqtest.c b/tests/qtest/libqtest.c
index 2fbc3b88f3..362b1f724f 100644
--- a/tests/qtest/libqtest.c
+++ b/tests/qtest/libqtest.c
@@ -202,8 +202,24 @@ void qtest_wait_qemu(QTestState *s)
 {
 #ifndef _WIN32
     pid_t pid;
+    uint64_t end;
+
+    /* poll for 10s until sending SIGKILL */
+    end = g_get_monotonic_time() + 10 * G_TIME_SPAN_SECOND;
+
+    do {
+        pid = waitpid(s->qemu_pid, &s->wstatus, WNOHANG);
+        if (pid != 0) {
+            break;
+        }
+        g_usleep(100 * 1000);
+    } while (g_get_monotonic_time() < end);
+
+    if (pid == 0) {
+        kill(s->qemu_pid, SIGKILL);
+        TFR(pid = waitpid(s->qemu_pid, &s->wstatus, 0));
+    }
 
-    TFR(pid = waitpid(s->qemu_pid, &s->wstatus, 0));
     assert(pid == s->qemu_pid);
 #else
     DWORD ret;
-- 
2.39.0