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[v2,14/15] selftests/pidfd: add fifth PIDFD_INFO_EXIT selftest

Message ID 20250304-work-pidfs-kill_on_last_close-v2-14-44fdacfaa7b7@kernel.org (mailing list archive)
State New
Headers show
Series pidfs: provide information after task has been reaped | expand

Commit Message

Christian Brauner March 4, 2025, 9:41 a.m. UTC 
Add a selftest for PIDFD_INFO_EXIT behavior.

Signed-off-by: Christian Brauner <brauner@kernel.org>
---
 tools/testing/selftests/pidfd/pidfd_info_test.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
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Patch

diff --git a/tools/testing/selftests/pidfd/pidfd_info_test.c b/tools/testing/selftests/pidfd/pidfd_info_test.c
index 0d0af4c2a84d..16e4be2364df 100644
--- a/tools/testing/selftests/pidfd/pidfd_info_test.c
+++ b/tools/testing/selftests/pidfd/pidfd_info_test.c
@@ -195,4 +195,27 @@  TEST_F(pidfd_info, success_reaped)
 	ASSERT_EQ(WEXITSTATUS(info.exit_code), 0);
 }
 
+TEST_F(pidfd_info, success_reaped_poll)
+{
+	struct pidfd_info info = {
+		.mask = PIDFD_INFO_CGROUPID | PIDFD_INFO_EXIT,
+	};
+	struct pollfd fds = {};
+	int nevents;
+
+	fds.events = POLLIN;
+	fds.fd = self->child_pidfd2;
+
+	nevents = poll(&fds, 1, -1);
+	ASSERT_EQ(nevents, 1);
+	ASSERT_TRUE(!!(fds.revents & POLLIN));
+	ASSERT_TRUE(!!(fds.revents & POLLHUP));
+
+	ASSERT_EQ(ioctl(self->child_pidfd2, PIDFD_GET_INFO, &info), 0);
+	ASSERT_FALSE(!!(info.mask & PIDFD_INFO_CREDS));
+	ASSERT_TRUE(!!(info.mask & PIDFD_INFO_EXIT));
+	ASSERT_TRUE(WIFSIGNALED(info.exit_code));
+	ASSERT_EQ(WTERMSIG(info.exit_code), SIGKILL);
+}
+
 TEST_HARNESS_MAIN