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selftests/pidfd: add second supported_mask test

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Verify that supported_mask is returned even when other fields are
requested.

Link: https://patch.msgid.link/20251028-work-coredump-signal-v1-11-ca449b7b7aa0@kernel.org
Reviewed-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2025-10-28 09:45:56 +01:00
parent e12f734208
commit 2593deaac8
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GPG Key ID: 91C61BC06578DCA2
1 changed files with 32 additions and 0 deletions
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32
tools/testing/selftests/pidfd/pidfd_info_test.c
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@ -731,4 +731,36 @@ TEST(supported_mask_field)
close(pidfd);
}
/*
* Test: PIDFD_INFO_SUPPORTED_MASK always available
*
* Verify that supported_mask is returned even when other fields are requested.
*/
TEST(supported_mask_with_other_fields)
{
struct pidfd_info info = {
.mask = PIDFD_INFO_CGROUPID | PIDFD_INFO_SUPPORTED_MASK,
};
int pidfd;
pid_t pid;
pid = create_child(&pidfd, 0);
ASSERT_GE(pid, 0);
if (pid == 0)
pause();
ASSERT_EQ(ioctl(pidfd, PIDFD_GET_INFO, &info), 0);
/* Both fields should be present */
ASSERT_TRUE(!!(info.mask & PIDFD_INFO_CGROUPID));
ASSERT_TRUE(!!(info.mask & PIDFD_INFO_SUPPORTED_MASK));
ASSERT_NE(info.supported_mask, 0);
/* Clean up */
sys_pidfd_send_signal(pidfd, SIGKILL, NULL, 0);
sys_waitid(P_PIDFD, pidfd, NULL, WEXITED);
close(pidfd);
}
TEST_HARNESS_MAIN