1/* Copyright (C) 1991, 92, 96, 97, 98, 99 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, write to the Free 16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 17 02111-1307 USA. */ 18 19#ifndef _SYS_FILE_H 20#define _SYS_FILE_H 1 21 22#include <features.h> 23 24#ifndef _FCNTL_H 25# include <fcntl.h> 26#endif 27 28__BEGIN_DECLS 29 30 31/* Alternate names for values for the WHENCE argument to `lseek'. 32 These are the same as SEEK_SET, SEEK_CUR, and SEEK_END, respectively. */ 33#ifndef L_SET 34# define L_SET 0 /* Seek from beginning of file. */ 35# define L_INCR 1 /* Seek from current position. */ 36# define L_XTND 2 /* Seek from end of file. */ 37#endif 38 39 40/* Operations for the `flock' call. */ 41#define LOCK_SH 1 /* Shared lock. */ 42#define LOCK_EX 2 /* Exclusive lock. */ 43#define LOCK_UN 8 /* Unlock. */ 44 45/* Can be OR'd in to one of the above. */ 46#define LOCK_NB 4 /* Don't block when locking. */ 47 48 49/* Apply or remove an advisory lock, according to OPERATION, 50 on the file FD refers to. */ 51extern int flock (int __fd, int __operation) __THROW; 52 53 54__END_DECLS 55 56#endif /* sys/file.h */ 57