libqtest: add qtest_remove_abrt_handler()

Add a function to remove previously-added abrt handler functions.

Now that a symmetric pair of add/remove functions exists we can also
balance the SIGABRT handler installation. The signal handler was
installed each time qtest_add_abrt_handler() was called. Now it is
installed when the abrt handler list becomes non-empty and removed again
when the list becomes empty.

The qtest_remove_abrt_handler() function will be used by
vhost-user-blk-test.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
Message-Id: <20210223144653.811468-5-stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/tests/qtest/libqos/libqtest.h b/tests/qtest/libqos/libqtest.h
index 51287b9..a68dcd7 100644
--- a/tests/qtest/libqos/libqtest.h
+++ b/tests/qtest/libqos/libqtest.h
@@ -649,9 +649,27 @@ void qtest_add_data_func_full(const char *str, void *data,
         g_free(path); \
     } while (0)
 
+/**
+ * qtest_add_abrt_handler:
+ * @fn: Handler function
+ * @data: Argument that is passed to the handler
+ *
+ * Add a handler function that is invoked on SIGABRT. This can be used to
+ * terminate processes and perform other cleanup. The handler can be removed
+ * with qtest_remove_abrt_handler().
+ */
 void qtest_add_abrt_handler(GHookFunc fn, const void *data);
 
 /**
+ * qtest_remove_abrt_handler:
+ * @data: Argument previously passed to qtest_add_abrt_handler()
+ *
+ * Remove an abrt handler that was previously added with
+ * qtest_add_abrt_handler().
+ */
+void qtest_remove_abrt_handler(void *data);
+
+/**
  * qtest_qmp_assert_success:
  * @qts: QTestState instance to operate on
  * @fmt: QMP message to send to qemu, formatted like