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- /* O_*, F_*, FD_* bit values for GNU.
- Copyright (C) 1993, 1994 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. */
- #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
-
-
- /* 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 /* XXX name? want this? */
- #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. */
- #ifdef __USE_MISC
- #define O_SHLOCK 0x00020000 /* Open with shared file lock. */
- #define O_EXLOCK 0x00040000 /* Open with exclusive file lock. */
- #endif
-
-
- /* 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 */
-