/* O_*, F_*, FD_* bit values. 4.4BSD/Generic version. Copyright (C) 1991-2012 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 Lesser General Public License as published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #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. */ #define O_NOCTTY 0x8000 /* Don't assign a controlling terminal. */ #define O_ASYNC 0x0040 /* Send SIGIO to owner when data is ready. */ #define O_FSYNC 0x0080 /* Synchronous writes. */ #define O_SYNC O_FSYNC #ifdef __USE_MISC #define O_SHLOCK 0x0010 /* Open with shared file lock. */ #define O_EXLOCK 0x0020 /* Open with shared exclusive lock. */ #endif #ifdef __USE_XOPEN2K8 # define O_DIRECTORY 0x00200000 /* Must be a directory. */ # define O_NOFOLLOW 0x00000100 /* Do not follow links. */ # define O_CLOEXEC 0x00400000 /* Set close_on_exec. */ #endif #if defined __USE_POSIX199309 || defined __USE_UNIX98 # define O_DSYNC 0x00010000 /* Synchronize data. */ # define O_RSYNC 0x00020000 /* Synchronize read operations. */ #endif /* All opens support large file sizes, so there is no flag bit for this. */ #ifdef __USE_LARGEFILE64 # define O_LARGEFILE 0 #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 FFSYNC O_FSYNC # define FSYNC O_SYNC # define FAPPEND O_APPEND # 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. */ #if defined __USE_BSD || defined __USE_UNIX98 || defined __USE_XOPEN2K8 #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). */ /* Not necessary, we always have 64-bit offsets. */ #define F_GETLK64 F_GETLK /* Get record locking info. */ #define F_SETLK64 F_SETLK /* Set record locking info (non-blocking). */ #define F_SETLKW64 F_SETLKW/* Set record locking info (blocking). */ #ifdef __USE_XOPEN2K8 # define F_DUPFD_CLOEXEC 12 /* Duplicate file descriptor with close-on-exit set. */ #endif /* 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 { __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. */ 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'). */ }; #ifdef __USE_LARGEFILE64 /* Note this matches struct flock exactly. */ struct flock64 { __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. */ 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'). */ }; #endif /* 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. */ /* Advise to `posix_fadvise'. */ #ifdef __USE_XOPEN2K # define POSIX_FADV_NORMAL 0 /* No further special treatment. */ # define POSIX_FADV_RANDOM 1 /* Expect random page references. */ # define POSIX_FADV_SEQUENTIAL 2 /* Expect sequential page references. */ # define POSIX_FADV_WILLNEED 3 /* Will need these pages. */ # define POSIX_FADV_DONTNEED 4 /* Don't need these pages. */ # define POSIX_FADV_NOREUSE 5 /* Data will be accessed once. */ #endif