The C and C++ Include Header Files

/usr/include/x86_64-linux-gnu/bits/fcntl.h


$ cat -n /usr/include/x86_64-linux-gnu/bits/fcntl.h

     1	/* O_*, F_*, FD_* bit values for Linux/x86.
     2	   Copyright (C) 2001-2024 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 _FCNTL_H
    20	# error "Never use <bits/fcntl.h> directly; include <fcntl.h> instead."
    21	#endif
    22	
    23	#ifdef __x86_64__
    24	# define __O_LARGEFILE	0
    25	#endif
    26	
    27	#ifdef __x86_64__
    28	/* Not necessary, we always have 64-bit offsets.  */
    29	# define F_GETLK64	5	/* Get record locking info.  */
    30	# define F_SETLK64	6	/* Set record locking info (non-blocking).  */
    31	# define F_SETLKW64	7	/* Set record locking info (blocking).	*/
    32	#endif
    33	
    34	
    35	struct flock
    36	  {
    37	    short int l_type;	/* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK.	*/
    38	    short int l_whence;	/* Where `l_start' is relative to (like `lseek').  */
    39	#ifndef __USE_FILE_OFFSET64
    40	    __off_t l_start;	/* Offset where the lock begins.  */
    41	    __off_t l_len;	/* Size of the locked area; zero means until EOF.  */
    42	#else
    43	    __off64_t l_start;	/* Offset where the lock begins.  */
    44	    __off64_t l_len;	/* Size of the locked area; zero means until EOF.  */
    45	#endif
    46	    __pid_t l_pid;	/* Process holding the lock.  */
    47	  };
    48	
    49	#ifdef __USE_LARGEFILE64
    50	struct flock64
    51	  {
    52	    short int l_type;	/* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK.	*/
    53	    short int l_whence;	/* Where `l_start' is relative to (like `lseek').  */
    54	    __off64_t l_start;	/* Offset where the lock begins.  */
    55	    __off64_t l_len;	/* Size of the locked area; zero means until EOF.  */
    56	    __pid_t l_pid;	/* Process holding the lock.  */
    57	  };
    58	#endif
    59	
    60	/* Include generic Linux declarations.  */
    61	#include <bits/fcntl-linux.h>