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/* O_*, F_*, FD_* bit values for 4.4 BSD.
Copyright (C) 1991, 1992, 1997 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. */
#ifndef _FCNTL_H
#error "Never use <bits/fcntl.h> directly; include <fcntl.h> instead."
#endif
/* 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 0x0200 /* Create file if it doesn't exist. */
#define O_EXCL 0x0800 /* Fail if file already exists. */
#define O_TRUNC 0x0400 /* Truncate file to zero length. */
/* Apparently not assigning a controlling terminal is the default
behavior in BSD, so no bit is required to request that behavior. */
#define O_NOCTTY 0 /* Don't assign a controlling terminal. */
#ifdef __USE_MISC
#define O_ASYNC 0x0040 /* Send SIGIO to owner when data is ready. */
#define O_FSYNC 0x0080 /* Synchronous writes. */
#define O_SYNC O_FSYNC
#define O_SHLOCK 0x0010 /* Open with shared file lock. */
#define O_EXLOCK 0x0020 /* Open with shared exclusive lock. */
#endif
/* File status flags for `open' and `fcntl'. */
#define O_APPEND 0x0008 /* Writes append to the file. */
#define O_NONBLOCK 0x0004 /* Non-blocking I/O. */
#ifdef __USE_BSD
#define O_NDELAY O_NONBLOCK
#endif
#ifdef __USE_BSD
/* Bits in the file status flags returned by F_GETFL.
These are all the O_* flags, plus FREAD and FWRITE, which are
independent bits set by which of O_RDONLY, O_WRONLY, and O_RDWR, was
given to `open'. */
#define FREAD 1
#define FWRITE 2
/* Traditional BSD names the O_* bits. */
#define FASYNC O_ASYNC
#define FCREAT O_CREAT
#define FEXCL O_EXCL
#define FTRUNC O_TRUNC
#define FNOCTTY O_NOCTTY
#define FFSYNC O_FSYNC
#define FSYNC O_SYNC
#define FAPPEND O_APPEND
#define FNONBLOCK O_NONBLOCK
#define FNDELAY O_NDELAY
#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. */
#ifdef __USE_BSD
#define F_GETOWN 5 /* Get owner (receiver of SIGIO). */
#define F_SETOWN 6 /* Set owner (receiver of SIGIO). */
#endif
#define F_GETLK 7 /* Get record locking info. */
#define F_SETLK 8 /* Set record locking info (non-blocking). */
#define F_SETLKW 9 /* Set record locking info (blocking). */
/* File descriptor flags used with F_GETFD and F_SETFD. */
#define FD_CLOEXEC 1 /* Close on exec. */
#include <bits/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_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. */
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