/* Copyright (C) 1991-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _SYS_FILE_H
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#define _SYS_FILE_H 1
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#include <features.h>
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#ifndef _FCNTL_H
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# include <fcntl.h>
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#endif
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__BEGIN_DECLS
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/* Alternate names for values for the WHENCE argument to `lseek'.
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These are the same as SEEK_SET, SEEK_CUR, and SEEK_END, respectively. */
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#ifndef L_SET
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# define L_SET 0 /* Seek from beginning of file. */
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# define L_INCR 1 /* Seek from current position. */
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# define L_XTND 2 /* Seek from end of file. */
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#endif
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/* Operations for the `flock' call. */
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#define LOCK_SH 1 /* Shared lock. */
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#define LOCK_EX 2 /* Exclusive lock. */
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#define LOCK_UN 8 /* Unlock. */
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/* Can be OR'd in to one of the above. */
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#define LOCK_NB 4 /* Don't block when locking. */
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/* Apply or remove an advisory lock, according to OPERATION,
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on the file FD refers to. */
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extern int flock (int __fd, int __operation) __THROW;
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__END_DECLS
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#endif /* sys/file.h */
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