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The C and C++ Include Header Files

/usr/include/x86_64-linux-gnu/sys/pidfd.h


$ cat -n /usr/include/x86_64-linux-gnu/sys/pidfd.h

     1	/* Wrapper for file descriptors that refers to a process functions.
     2	   Copyright (C) 2022-2024 Free Software Foundation, Inc.
     3	   This file is part of the GNU C Library.
     4	
     5	   The GNU C Library is free software; you can redistribute it and/or
     6	   modify it under the terms of the GNU Lesser General Public
     7	   License as published by the Free Software Foundation; either
     8	   version 2.1 of the License, or (at your option) any later version.
     9	
    10	   The GNU C Library is distributed in the hope that it will be useful,
    11	   but WITHOUT ANY WARRANTY; without even the implied warranty of
    12	   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    13	   Lesser General Public License for more details.
    14	
    15	   You should have received a copy of the GNU Lesser General Public
    16	   License along with the GNU C Library; if not, see
    17	   <https://www.gnu.org/licenses/>.  */
    18	
    19	#ifndef _PIDFD_H
    20	
    21	#include <fcntl.h>
    22	#include <bits/types/siginfo_t.h>
    23	
    24	#define PIDFD_NONBLOCK O_NONBLOCK
    25	
    26	/* Returns a file descriptor that refers to the process PID.  The
    27	   close-on-exec is set on the file descriptor.
    28	
    29	   The FLAGS argument is reserved for future use, it must be specified
    30	   as 0.  */
    31	extern int pidfd_open (__pid_t __pid, unsigned int __flags) __THROW;
    32	
    33	/* Duplicates an existing file descriptor TARGETFD in the process referred
    34	   by the PIDFD file descriptor PIDFD.
    35	
    36	   The FLAGS argument is reserved for future use, it must be specified
    37	   as 0.  */
    38	extern int pidfd_getfd (int __pidfd, int __targetfd,
    39				unsigned int __flags) __THROW;
    40	
    41	/* Sends the signal SIG to the target process referred by the PIDFD.  If
    42	   INFO points to a siginfo_t buffer, it will be populated.
    43	
    44	   The FLAGS argument is reserved for future use, it must be specified
    45	   as 0.  */
    46	extern int pidfd_send_signal (int __pidfd, int __sig, siginfo_t *__info,
    47				      unsigned int __flags) __THROW;
    48	
    49	/* Query the process ID (PID) from process descriptor FD.  Return the PID
    50	   or -1 in case of an error.  */
    51	extern pid_t pidfd_getpid (int __fd) __THROW;
    52	
    53	#endif /* _PIDFD_H  */