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/* O_*, F_*, FD_* bit values for System V.
Copyright (C) 1991, 1992 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., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#ifndef _FCNTLBITS_H
#define _FCNTLBITS_H 1
/* File access modes for `open' and `fcntl'. */
#define O_RDONLY 0 /* Open read-only. */
#define O_WRONLY 1 /* Open write-only. */
#define O_RDWR 2 /* Open read/write. */
/* Bits OR'd into the second argument to open. */
#define O_CREAT 00400 /* Create file if it doesn't exist. */
#define O_EXCL 02000 /* Fail if file already exists. */
#define O_TRUNC 01000 /* Truncate file to zero length. */
#if defined (__USE_BSD) || defined (__USE_SVID)
#define O_SYNC 00020 /* Synchronous writes. */
#endif
/* File status flags for `open' and `fcntl'. */
#define O_APPEND 000010 /* Writes append to the file. */
#define O_NONBLOCK 000004 /* Non-blocking I/O. */
#ifdef __USE_BSD
/* System V doesn't support POSIX.1 O_NONBLOCK, but O_NDELAY is close. */
#define O_NDELAY O_NONBLOCK
#endif
/* Mask for file access modes. This is system-dependent in case
some system ever wants to define some other flavor of access. */
#define O_ACCMODE (O_RDONLY|O_WRONLY|O_RDWR)
/* Values for the second argument to `fcntl'. */
#define F_DUPFD 0 /* Duplicate file descriptor. */
#define F_GETFD 1 /* Get file descriptor flags. */
#define F_SETFD 2 /* Set file descriptor flags. */
#define F_GETFL 3 /* Get file status flags. */
#define F_SETFL 4 /* Set file status flags. */
#define F_GETLK 5 /* Get record locking info. */
#define F_SETLK 6 /* Set record locking info. */
#define F_SETLKW 7 /* Set record locking info, wait. */
/* File descriptor flags used with F_GETFD and F_SETFD. */
#define FD_CLOEXEC 1 /* Close on exec. */
#include <gnu/types.h>
/* The structure describing an advisory lock. This is the type of the third
argument to `fcntl' for the F_GETLK, F_SETLK, and F_SETLKW requests. */
struct flock
{
short int l_type; /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK. */
short int l_whence; /* Where `l_start' is relative to (like `lseek'). */
__off_t l_start; /* Offset where the lock begins. */
__off_t l_len; /* Size of the locked area; zero means until EOF. */
short int l_sysid; /* System ID where locking process resides. */
short int l_pid; /* Process holding the lock. */
};
/* Values for the `l_type' field of a `struct flock'. */
#define F_RDLCK 1 /* Read lock. */
#define F_WRLCK 2 /* Write lock. */
#define F_UNLCK 3 /* Remove lock. */
#endif /* fcntlbits.h */
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