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/* Wrapper for file descriptors that refers to a process functions.
Copyright (C) 2022-2024 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
#define PIDFD_THREAD O_EXCL
#define PIDFD_SIGNAL_THREAD (1UL << 0)
#define PIDFD_SIGNAL_THREAD_GROUP (1UL << 1)
#define PIDFD_SIGNAL_PROCESS_GROUP (1UL << 2)
/* Returns a file descriptor that refers to the process PID. The
close-on-exec is set on the file descriptor. */
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. */
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 */
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