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c0c9524a11
The pidfd interface was extended with:
* PIDFD_GET_INFO and pidfd_info (along with related extra flags) to
allow get information about the process without the need to parse
/proc (commit cdda1f26e74ba, Linux 6.13).
* PIDFD_SELF_{THREAD,THREAD_GROUP,SELF,SELF_PROCESS} to allow
pidfd_send_signal refer to the own process or thread lead groups
without the need of allocating a file descriptor (commit f08d0c3a71114,
Linux 6.15).
* PIDFD_INFO_COREDUMP that extends PIDFD_GET_INFO to obtain coredump
information.
Linux uAPI header defines both PIDFD_SELF_THREAD and
PIDFD_SELF_THREAD_GROUP on linux/fcntl.h (since they reserve part of the
AT_* values), however for glibc I do not see any good reason to add pidfd
definitions on fcntl-linux.h.
The tst-pidfd.c is extended with some PIDFD_SELF_* tests and a new
‘tst-pidfd_getinfo.c’ test is added to check PIDFD_GET_INFO. The
PIDFD_INFO_COREDUMP tests would require very large and complex tests
that are already covered by kernel tests.
Checked on aarch64-linux-gnu and x86_64-linux-gnu on kernels 6.8 and
6.17.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
/* Basic tests for Linux PID_GET_INFO interfaces.
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Copyright (C) 2022-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <stdint.h>
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#include <sys/pidfd.h>
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#include <support/check.h>
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#include <support/xunistd.h>
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static int
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do_test (void)
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{
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{
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/* The pidfd_getfd syscall was the last in the set of pidfd related
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syscalls added to the kernel. Use pidfd_getfd to decide if this
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kernel has pidfd support that we can test. */
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int r = pidfd_getfd (0, 0, 1);
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TEST_VERIFY_EXIT (r == -1);
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if (errno == ENOSYS)
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FAIL_UNSUPPORTED ("kernel does not support pidfd_getfd, skipping test");
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}
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int pidfd = pidfd_open (getpid(), 0);
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TEST_VERIFY (pidfd >= 0);
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int pid = pidfd_getpid (pidfd);
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TEST_VERIFY (pid >= 0);
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struct pidfd_info info = {
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.mask = PIDFD_INFO_CGROUPID,
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};
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if (ioctl (pidfd, PIDFD_GET_INFO, &info) != 0)
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{
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if (errno == ENOTTY)
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FAIL_UNSUPPORTED ("kernel does not support PIDFD_GET_INFO");
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else
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FAIL_EXIT1 ("ioctl (PIDFD_GET_INFO) failed: %m");
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}
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TEST_COMPARE (info.pid, pid);
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TEST_COMPARE (info.ppid, getppid ());
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TEST_COMPARE (info.ruid, getuid ());
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TEST_COMPARE (info.rgid, getgid ());
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TEST_COMPARE (info.euid, geteuid ());
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TEST_COMPARE (info.egid, getegid ());
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TEST_COMPARE (info.suid, geteuid ());
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TEST_COMPARE (info.sgid, getegid ());
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if (info.mask & PIDFD_INFO_CGROUPID)
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TEST_VERIFY (info.cgroupid != 0);
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xclose (pidfd);
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return 0;
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}
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#include <support/test-driver.c>
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