1995-07-25 18:36:31 +00:00
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/* Copyright (C) 1991, 1992, 1994, 1995 Free Software Foundation, Inc.
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1995-02-18 01:27:10 +00:00
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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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the, 1992 Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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/*
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* POSIX Standard: 6.5 File Control Operations <fcntl.h>
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*/
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#ifndef _FCNTL_H
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#define _FCNTL_H 1
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#include <features.h>
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/* This must be early so <fcntlbits.h> can define types winningly. */
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__BEGIN_DECLS
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/* Get the definitions of O_*, F_*, FD_*: all the
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numbers and flag bits for `open', `fcntl', et al. */
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#include <fcntlbits.h>
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#ifdef __USE_MISC
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#ifndef R_OK /* Verbatim from <unistd.h>. Ugh. */
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/* Values for the second argument to access.
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These may be OR'd together. */
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#define R_OK 4 /* Test for read permission. */
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#define W_OK 2 /* Test for write permission. */
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#define X_OK 1 /* Test for execute permission. */
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#define F_OK 0 /* Test for existence. */
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#endif
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#endif /* Use misc. */
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/* Do the file control operation described by CMD on FD.
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The remaining arguments are interpreted depending on CMD. */
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extern int __fcntl __P ((int __fd, int __cmd, ...));
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extern int fcntl __P ((int __fd, int __cmd, ...));
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/* Open FILE and return a new file descriptor for it, or -1 on error.
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OFLAG determines the type of access used. If O_CREAT is on OFLAG,
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the third argument is taken as a `mode_t', the mode of the created file. */
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extern int __open __P ((__const char *__file, int __oflag,...));
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extern int open __P ((__const char *__file, int __oflag,...));
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/* Create and open FILE, with mode MODE.
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This takes an `int' MODE argument because that is
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what `mode_t' will be widened to. */
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extern int creat __P ((__const char *__file, __mode_t __mode));
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#if defined (__USE_MISC) && !defined (F_LOCK)
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/* NOTE: These declarations also appear in <unistd.h>; be sure to keep both
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files consistent. Some systems have them there and some here, and some
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software depends on the macros being defined without including both. */
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/* `lockf' is a simpler interface to the locking facilities of `fcntl'.
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LEN is always relative to the current file position.
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The CMD argument is one of the following. */
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#define F_ULOCK 0 /* Unlock a previously locked region. */
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#define F_LOCK 1 /* Lock a region for exclusive use. */
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#define F_TLOCK 2 /* Test and lock a region for exclusive use. */
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#define F_TEST 3 /* Test a region for other processes locks. */
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extern int lockf __P ((int __fd, int __cmd, __off_t __len));
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#endif
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__END_DECLS
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#endif /* fcntl.h */
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