/* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifndef _FCNTL_H #error "Never use directly; include instead." #endif /* 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 /* 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. */