The C and C++ Include Header Files

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


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

     1	/* Copyright (C) 1991-2024 Free Software Foundation, Inc.
     2	   This file is part of the GNU C Library.
     3	
     4	   The GNU C Library is free software; you can redistribute it and/or
     5	   modify it under the terms of the GNU Lesser General Public
     6	   License as published by the Free Software Foundation; either
     7	   version 2.1 of the License, or (at your option) any later version.
     8	
     9	   The GNU C Library is distributed in the hope that it will be useful,
    10	   but WITHOUT ANY WARRANTY; without even the implied warranty of
    11	   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    12	   Lesser General Public License for more details.
    13	
    14	   You should have received a copy of the GNU Lesser General Public
    15	   License along with the GNU C Library; if not, see
    16	   <https://www.gnu.org/licenses/>.  */
    17	
    18	#ifndef	_SYS_FILE_H
    19	#define	_SYS_FILE_H	1
    20	
    21	#include <features.h>
    22	
    23	#ifndef	_FCNTL_H
    24	# include <fcntl.h>
    25	#endif
    26	
    27	__BEGIN_DECLS
    28	
    29	
    30	/* Alternate names for values for the WHENCE argument to `lseek'.
    31	   These are the same as SEEK_SET, SEEK_CUR, and SEEK_END, respectively.  */
    32	#ifndef L_SET
    33	# define L_SET	0	/* Seek from beginning of file.  */
    34	# define L_INCR	1	/* Seek from current position.  */
    35	# define L_XTND	2	/* Seek from end of file.  */
    36	#endif
    37	
    38	
    39	/* Operations for the `flock' call.  */
    40	#define	LOCK_SH	1	/* Shared lock.  */
    41	#define	LOCK_EX	2 	/* Exclusive lock.  */
    42	#define	LOCK_UN	8	/* Unlock.  */
    43	
    44	/* Can be OR'd in to one of the above.  */
    45	#define	LOCK_NB	4	/* Don't block when locking.  */
    46	
    47	
    48	/* Apply or remove an advisory lock, according to OPERATION,
    49	   on the file FD refers to.  */
    50	extern int flock (int __fd, int __operation) __THROW;
    51	
    52	
    53	__END_DECLS
    54	
    55	#endif /* sys/file.h  */