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/* O_*, F_*, FD_* bit values for GNU.
Copyright (C) 1993, 1994, 1996, 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., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#ifndef _FCNTLBITS_H
#define _FCNTLBITS_H 1
/* File access modes. These are understood by io servers; they can be
passed in `dir_lookup', and are returned by `io_get_openmodes'.
Consequently they can be passed to `open', `hurd_file_name_lookup', and
`file_name_lookup'; and are returned by `fcntl' with the F_GETFL
command. */
/* In GNU, read and write are bits (unlike BSD). */
#ifdef __USE_GNU
#define O_READ O_RDONLY /* Open for reading. */
#define O_WRITE O_WRONLY /* Open for writing. */
#define O_EXEC 0x0004 /* Open for execution. */
#define O_NORW 0 /* Open without R/W access. */
#endif
/* POSIX.1 standard names. */
#define O_RDONLY 0x0001 /* Open read-only. */
#define O_WRONLY 0x0002 /* Open write-only. */
#define O_RDWR (O_RDONLY|O_WRONLY) /* Open for reading and writing. */
#define O_ACCMODE O_RDWR /* Mask for file access modes. */
/* File name translation flags. These are understood by io servers;
they can be passed in `dir_lookup', and consequently to `open',
`hurd_file_name_lookup', and `file_name_lookup'. */
#define O_CREAT 0x0010 /* Create file if it doesn't exist. */
#define O_EXCL 0x0020 /* Fail if file already exists. */
#ifdef __USE_GNU
#define O_NOLINK 0x0040 /* No name mappings on final component. */
#define O_NOTRANS 0x0080 /* No translator on final component. */
#endif
/* I/O operating modes. These are understood by io servers; they can be
passed in `dir_lookup' and set or fetched with `io_*_openmodes'.
Consequently they can be passed to `open', `hurd_file_name_lookup',
`file_name_lookup', and `fcntl' with the F_SETFL command; and are
returned by `fcntl' with the F_GETFL command. */
#define O_APPEND 0x0100 /* Writes always append to the file. */
#ifdef __USE_BSD
#define O_ASYNC 0x0200 /* Send SIGIO to owner when data is ready. */
#define O_FSYNC 0x0400 /* Synchronous writes. */
#define O_SYNC O_FSYNC
#endif
#ifdef __USE_GNU
#define O_NOATIME 0x0800 /* Don't set access time on read (owner). */
#endif
#ifdef __USE_MISC
#define O_SHLOCK 0x00020000 /* Open with shared file lock. */
#define O_EXLOCK 0x00040000 /* Open with exclusive file lock. */
#endif
/* The name O_NONBLOCK is unfortunately overloaded; it is both a file name
translation flag and an I/O operating mode. O_NDELAY is the deprecated
BSD name for the same flag, overloaded in the same way.
When used in `dir_lookup' (and consequently `open', `hurd_file_name_lookup',
or `file_name_lookup'), O_NONBLOCK says the open should return immediately
instead of blocking for any significant length of time (e.g., to wait
for carrier detect on a serial line). It is also saved as an I/O
operating mode, and after open has the following meaning.
When used in `io_*_openmodes' (and consequently `fcntl' with the F_SETFL
command), the O_NONBLOCK flag means to do nonblocking i/o: any i/o
operation that would block for any significant length of time will instead
fail with EAGAIN. */
#define O_NONBLOCK 0x0008 /* Non-blocking open or non-blocking I/O. */
#ifdef __USE_BSD
#define O_NDELAY O_NONBLOCK /* Deprecated. */
#endif
#ifdef __USE_GNU
/* Mask of bits which are understood by io servers. */
#define O_HURD (0xffff | O_EXLOCK | O_SHLOCK)
#endif
/* Open-time action flags. These are understood by `hurd_file_name_lookup'
and consequently by `open' and `file_name_lookup'. They are not preserved
once the file has been opened. */
#define O_TRUNC 0x00010000 /* Truncate file to zero length. */
/* Controlling terminal flags. These are understood only by `open',
and are not preserved once the file has been opened. */
#ifdef __USE_GNU
#define O_IGNORE_CTTY 0x00080000 /* Don't do any ctty magic at all. */
#endif
/* `open' never assigns a controlling terminal in GNU. */
#define O_NOCTTY 0 /* Don't assign a controlling terminal. */
#ifdef __USE_BSD
/* Bits in the file status flags returned by F_GETFL. */
#define FREAD O_RDONLY
#define FWRITE O_WRONLY
/* 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
/* 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 <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
{
int l_type; /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK. */
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. */
__pid_t 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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