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/* Basic tests for Linux PID_GET_INFO interfaces.
Copyright (C) 2022-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <stdint.h>
#include <sys/pidfd.h>
#include <support/check.h>
#include <support/xunistd.h>
static int
do_test (void)
{
{
/* The pidfd_getfd syscall was the last in the set of pidfd related
syscalls added to the kernel. Use pidfd_getfd to decide if this
kernel has pidfd support that we can test. */
int r = pidfd_getfd (0, 0, 1);
TEST_VERIFY_EXIT (r == -1);
if (errno == ENOSYS)
FAIL_UNSUPPORTED ("kernel does not support pidfd_getfd, skipping test");
}
int pidfd = pidfd_open (getpid(), 0);
TEST_VERIFY (pidfd >= 0);
int pid = pidfd_getpid (pidfd);
TEST_VERIFY (pid >= 0);
struct pidfd_info info = {
.mask = PIDFD_INFO_CGROUPID,
};
if (ioctl (pidfd, PIDFD_GET_INFO, &info) != 0)
{
if (errno == ENOTTY || errno == EINVAL)
FAIL_UNSUPPORTED ("kernel does not support PIDFD_GET_INFO");
else
FAIL_EXIT1 ("ioctl (PIDFD_GET_INFO) failed: %m");
}
TEST_COMPARE (info.pid, pid);
TEST_COMPARE (info.ppid, getppid ());
TEST_COMPARE (info.ruid, getuid ());
TEST_COMPARE (info.rgid, getgid ());
TEST_COMPARE (info.euid, geteuid ());
TEST_COMPARE (info.egid, getegid ());
TEST_COMPARE (info.suid, geteuid ());
TEST_COMPARE (info.sgid, getegid ());
if (info.mask & PIDFD_INFO_CGROUPID)
TEST_VERIFY (info.cgroupid != 0);
xclose (pidfd);
return 0;
}
#include <support/test-driver.c>
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