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/* Copyright (C) 1991-2018 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 <http://www.gnu.org/licenses/>. */ #ifndef _SYS_FILE_H #define _SYS_FILE_H 1 #include <features.h> #ifndef _FCNTL_H # include <fcntl.h> #endif __BEGIN_DECLS /* Alternate names for values for the WHENCE argument to `lseek'. These are the same as SEEK_SET, SEEK_CUR, and SEEK_END, respectively. */ #ifndef L_SET # define L_SET 0 /* Seek from beginning of file. */ # define L_INCR 1 /* Seek from current position. */ # define L_XTND 2 /* Seek from end of file. */ #endif /* Operations for the `flock' call. */ #define LOCK_SH 1 /* Shared lock. */ #define LOCK_EX 2 /* Exclusive lock. */ #define LOCK_UN 8 /* Unlock. */ /* Can be OR'd in to one of the above. */ #define LOCK_NB 4 /* Don't block when locking. */ /* Apply or remove an advisory lock, according to OPERATION, on the file FD refers to. */ extern int flock (int __fd, int __operation) __THROW; __END_DECLS #endif /* sys/file.h */