glibc/io/fcntl.h

/* Copyright (C) 1991, 92, 94, 95, 96, 97 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 Library General Public License as
   published by the Free Software Foundation; either version 2 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

/*
 *	POSIX Standard: 6.5 File Control Operations	<fcntl.h>
 */

#ifndef	_FCNTL_H
#define	_FCNTL_H	1

#include <features.h>

/* This must be early so <bits/fcntl.h> can define types winningly.  */
__BEGIN_DECLS

/* Get the definitions of O_*, F_*, FD_*: all the
   numbers and flag bits for `open', `fcntl', et al.  */
#include <bits/fcntl.h>

#ifdef	__USE_MISC
# ifndef R_OK			/* Verbatim from <unistd.h>.  Ugh.  */
/* Values for the second argument to access.
   These may be OR'd together.  */
#  define R_OK	4		/* Test for read permission.  */
#  define W_OK	2		/* Test for write permission.  */
#  define X_OK	1		/* Test for execute permission.  */
#  define F_OK	0		/* Test for existence.  */
# endif
#endif /* Use misc.  */

/* Do the file control operation described by CMD on FD.
   The remaining arguments are interpreted depending on CMD.  */
extern int __fcntl __P ((int __fd, int __cmd, ...));
extern int fcntl __P ((int __fd, int __cmd, ...));

/* Open FILE and return a new file descriptor for it, or -1 on error.
   OFLAG determines the type of access used.  If O_CREAT is on OFLAG,
   the third argument is taken as a `mode_t', the mode of the created file.  */
extern int __open __P ((__const char *__file, int __oflag, ...));
extern int __open64 __P ((__const char *__file, int __oflag, ...));
#ifndef __USE_FILE_OFFSET64
extern int open __P ((__const char *__file, int __oflag, ...));
#else
extern int open __P ((__const char *__file, int __oflag, ...))
     __asm__ ("open64");
#endif
#ifdef __USE_LARGEFILE64
extern int open64 __P ((__const char *__file, int __oflag, ...));
#endif

/* Create and open FILE, with mode MODE.
   This takes an `int' MODE argument because that is
   what `mode_t' will be widened to.  */
#ifndef __USE_FILE_OFFSET64
extern int creat __P ((__const char *__file, __mode_t __mode));
#else
extern int creat __P ((__const char *__file, __mode_t __mode))
     __asm__ ("creat64");
#endif
#ifdef __USE_LARGEFILE64
extern int creat64 __P ((__const char *__file, __mode_t __mode));
#endif

#if !defined F_LOCK && (defined __USE_MISC || defined __USE_XOPEN_EXTENDED)
/* NOTE: These declarations also appear in <unistd.h>; be sure to keep both
   files consistent.  Some systems have them there and some here, and some
   software depends on the macros being defined without including both.  */

/* `lockf' is a simpler interface to the locking facilities of `fcntl'.
   LEN is always relative to the current file position.
   The CMD argument is one of the following.  */

# define F_ULOCK 0	/* Unlock a previously locked region.  */
# define F_LOCK  1	/* Lock a region for exclusive use.  */
# define F_TLOCK 2	/* Test and lock a region for exclusive use.  */
# define F_TEST  3	/* Test a region for other processes locks.  */

# ifndef __USE_FILE_OFFSET64
extern int lockf __P ((int __fd, int __cmd, __off_t __len));
# else
extern int lockf __P ((int __fd, int __cmd, __off_t __len))
     __asm__ ("lockf64");
# endif
# ifdef __USE_LARGEFILE64
extern int lockf64 __P ((int __fd, int __cmd, __off64_t __len));
# endif
#endif

__END_DECLS

#endif /* fcntl.h  */