mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-26 06:50:07 +00:00
e7190fc73d
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>
54 lines
2.0 KiB
C
54 lines
2.0 KiB
C
/* Wrapper for file descriptors that refers to a process functions.
|
|
Copyright (C) 2022-2023 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 _PIDFD_H
|
|
|
|
#include <fcntl.h>
|
|
#include <bits/types/siginfo_t.h>
|
|
|
|
#define PIDFD_NONBLOCK O_NONBLOCK
|
|
|
|
/* Returns a file descriptor that refers to the process PID. The
|
|
close-on-exec is set on the file descriptor.
|
|
|
|
The FLAGS argument is reserved for future use, it must be specified
|
|
as 0. */
|
|
extern int pidfd_open (__pid_t __pid, unsigned int __flags) __THROW;
|
|
|
|
/* Duplicates an existing file descriptor TARGETFD in the process referred
|
|
by the PIDFD file descriptor PIDFD.
|
|
|
|
The FLAGS argument is reserved for future use, it must be specified
|
|
as 0. */
|
|
extern int pidfd_getfd (int __pidfd, int __targetfd,
|
|
unsigned int __flags) __THROW;
|
|
|
|
/* Sends the signal SIG to the target process referred by the PIDFD. If
|
|
INFO points to a siginfo_t buffer, it will be populated.
|
|
|
|
The FLAGS argument is reserved for future use, it must be specified
|
|
as 0. */
|
|
extern int pidfd_send_signal (int __pidfd, int __sig, siginfo_t *__info,
|
|
unsigned int __flags) __THROW;
|
|
|
|
/* Query the process ID (PID) from process descriptor FD. Return the PID
|
|
or -1 in case of an error. */
|
|
extern pid_t pidfd_getpid (int __fd) __THROW;
|
|
|
|
#endif /* _PIDFD_H */
|