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linux: Add pidfd_getpid

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This interface allows to obtain the associated process ID from the
process file descriptor.  It is done by parsing the procps fdinfo
information.  Its prototype is:

   pid_t pidfd_getpid (int fd)

It returns the associated pid or -1 in case of an error and sets the
errno accordingly.  The possible errno values are those from open, read,
and close (used on procps parsing), along with:

   - EBADF if the FD is negative, does not have a PID associated, or if
     the fdinfo fields contain a value larger than pid_t.

   - EREMOTE if the PID is in a separate namespace.

   - ESRCH if the process is already terminated.

Checked on x86_64-linux-gnu on Linux 4.15 (no CLONE_PIDFD or waitid
support), Linux 5.4 (full support), and Linux 6.2.

Reviewed-by: Florian Weimer <fweimer@redhat.com>
This commit is contained in:
Adhemerval Zanella Netto
2023-08-24 13:42:19 -03:00
committed by Adhemerval Zanella
parent 0d6f9f6265
commit e7190fc73d
44 changed files with 520 additions and 0 deletions
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43
sysdeps/unix/sysv/linux/procutils.h Normal file
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/* Utilities functions to read/parse Linux procfs and sysfs.
Copyright (C) 2023 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/>. */
#ifndef _PROCUTILS_H
#define _PROCUTILS_H
#include <stdbool.h>
typedef int (*procutils_closure_t) (const char *line, void *arg);
#define PROCUTILS_MAX_LINE_LEN 256
/* Open and read the path FILENAME, line per line, and call CLOSURE with
argument ARG on each line. The read is done with a static buffer,
with non-cancellable calls, and the line is null terminated.
The CLOSURE should return 0 if the read should continue, otherwise the
the function should stop and return early.
The '\n' is not included in the CLOSURE input argument and lines longer
than PROCUTILS_MAX_LINE_LEN characteres are ignored.
It returns true in case the file is fully read or false if CLOSURE
returns a value diferent than 0. */
bool procutils_read_file (const char *filename, procutils_closure_t closure,
void *arg) attribute_hidden;
#endif