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selftests/pidfd: add first supported_mask test 

Verify that when PIDFD_INFO_SUPPORTED_MASK is requested, the kernel
returns the supported_mask field indicating which flags the kernel
supports.

Link: https://patch.msgid.link/20251028-work-coredump-signal-v1-10-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 09:45:55 +01:00
parent a945535dfd
commit e12f734208
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GPG Key ID: 91C61BC06578DCA2
1 changed files with 41 additions and 0 deletions
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41
tools/testing/selftests/pidfd/pidfd_info_test.c
View File

@ -690,4 +690,45 @@ TEST_F(pidfd_info, thread_group_exec_thread)
EXPECT_EQ(close(pidfd_thread), 0);
}
/*
* Test: PIDFD_INFO_SUPPORTED_MASK field
*
* Verify that when PIDFD_INFO_SUPPORTED_MASK is requested, the kernel
* returns the supported_mask field indicating which flags the kernel supports.
*/
TEST(supported_mask_field)
{
struct pidfd_info info = {
.mask = PIDFD_INFO_SUPPORTED_MASK,
};
int pidfd;
pid_t pid;
pid = create_child(&pidfd, 0);
ASSERT_GE(pid, 0);
if (pid == 0)
pause();
/* Request supported_mask field */
ASSERT_EQ(ioctl(pidfd, PIDFD_GET_INFO, &info), 0);
/* Verify PIDFD_INFO_SUPPORTED_MASK is set in the reply */
ASSERT_TRUE(!!(info.mask & PIDFD_INFO_SUPPORTED_MASK));
/* Verify supported_mask contains expected flags */
ASSERT_TRUE(!!(info.supported_mask & PIDFD_INFO_PID));
ASSERT_TRUE(!!(info.supported_mask & PIDFD_INFO_CREDS));
ASSERT_TRUE(!!(info.supported_mask & PIDFD_INFO_CGROUPID));
ASSERT_TRUE(!!(info.supported_mask & PIDFD_INFO_EXIT));
ASSERT_TRUE(!!(info.supported_mask & PIDFD_INFO_COREDUMP));
ASSERT_TRUE(!!(info.supported_mask & PIDFD_INFO_SUPPORTED_MASK));
ASSERT_TRUE(!!(info.supported_mask & PIDFD_INFO_COREDUMP_SIGNAL));
/* Clean up */
sys_pidfd_send_signal(pidfd, SIGKILL, NULL, 0);
sys_waitid(P_PIDFD, pidfd, NULL, WEXITED);
close(pidfd);
}
TEST_HARNESS_MAIN