183 lines
7.6 KiB
C
183 lines
7.6 KiB
C
/********************************************************************************
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* include/fcntl.h
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*
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* Copyright (C) 2007-2009, 2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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********************************************************************************/
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#ifndef __INCLUDE_FCNTL_H
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#define __INCLUDE_FCNTL_H
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/********************************************************************************
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* Included Files
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********************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <stdint.h>
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/********************************************************************************
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* Pre-processor Definitions
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********************************************************************************/
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/* open flag settings for open() (and related APIs) */
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#define O_RDONLY (1 << 0) /* Open for read access (only) */
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#define O_RDOK O_RDONLY /* Read access is permitted (non-standard) */
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#define O_WRONLY (1 << 1) /* Open for write access (only) */
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#define O_WROK O_WRONLY /* Write access is permitted (non-standard) */
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#define O_RDWR (O_RDOK|O_WROK) /* Open for both read & write access */
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#define O_CREAT (1 << 2) /* Create file/sem/mq object */
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#define O_EXCL (1 << 3) /* Name must not exist when opened */
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#define O_APPEND (1 << 4) /* Keep contents, append to end */
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#define O_TRUNC (1 << 5) /* Delete contents */
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#define O_NONBLOCK (1 << 6) /* Don't wait for data */
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#define O_NDELAY O_NONBLOCK /* Synonym for O_NONBLOCK */
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#define O_SYNC (1 << 7) /* Synchronize output on write */
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#define O_DSYNC O_SYNC /* Equivalent to OSYNC in NuttX */
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#define O_BINARY (1 << 8) /* Open the file in binary (untranslated) mode. */
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#define O_DIRECT (1 << 9) /* Avoid caching, write directly to hardware */
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#define O_CLOEXEC (1 << 10) /* Close on execute */
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/* Unsupported, but required open flags */
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#define O_RSYNC 0 /* Synchronize input on read */
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#define O_ACCMODE O_RDWR /* Mask for access mode */
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#define O_NOCTTY 0 /* Required by POSIX */
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#define O_TEXT 0 /* Open the file in text (translated) mode. */
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/* This is the highest bit number used in the open flags bitset. Bits above
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* this bit number may be used within NuttX for other, internal purposes.
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*/
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#define _O_MAXBIT 8
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/* Synonyms historically used as F_SETFL flags (BSD). */
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#define FNDELAY O_NONBLOCK /* Don't wait for data */
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#define FNONBLOCK O_NONBLOCK /* Don't wait for data */
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#define FAPPEND O_APPEND /* Keep contents, append to end */
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#define FSYNC O_SYNC /* Synchronize output on write */
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#define FASYNC 0 /* No counterpart in NuttX */
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/* FFCNTL is all the bits that may be set via fcntl. */
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#define FFCNTL (FNONBLOCK | FNDELAY | FAPPEND | FSYNC | FASYNC)
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/* fcntl() commands */
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#define F_DUPFD 0 /* Duplicate a file descriptor */
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#define F_GETFD 1 /* Read the file descriptor flags */
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#define F_GETFL 2 /* Read the file status flags */
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#define F_GETLEASE 3 /* Indicates what type of lease is held on fd (linux) */
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#define F_GETLK 4 /* Check if we could place a lock */
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#define F_GETOWN 5 /* Get the pid receiving SIGIO and SIGURG signals for fd */
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#define F_GETSIG 6 /* Get the signal sent */
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#define F_NOTIFY 7 /* Provide notification when directory referred to by fd changes (linux)*/
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#define F_SETFD 8 /* Set the file descriptor flags to value */
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#define F_SETFL 9 /* Set the file status flags to the value */
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#define F_SETLEASE 10 /* Set or remove file lease (linux) */
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#define F_SETLK 11 /* Acquire or release a lock on range of bytes */
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#define F_SETLKW 12 /* Like F_SETLK, but wait for lock to become available */
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#define F_SETOWN 13 /* Set pid that will receive SIGIO and SIGURG signals for fd */
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#define F_SETSIG 14 /* Set the signal to be sent */
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/* For posix fcntl() and lockf() */
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#define F_RDLCK 0 /* Take out a read lease */
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#define F_WRLCK 1 /* Take out a write lease */
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#define F_UNLCK 2 /* Remove a lease */
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/* close-on-exec flag for F_GETRL and F_SETFL */
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#define FD_CLOEXEC 1
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/* These are the notifications that can be received from F_NOTIFY (linux) */
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#define DN_ACCESS 0 /* A file was accessed */
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#define DN_MODIFY 1 /* A file was modified */
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#define DN_CREATE 2 /* A file was created */
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#define DN_DELETE 3 /* A file was unlinked */
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#define DN_RENAME 4 /* A file was renamed */
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#define DN_ATTRIB 5 /* Attributes of a file were changed */
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/* int creat(const char *path, mode_t mode);
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*
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* is equivalent to open with O_WRONLY|O_CREAT|O_TRUNC.
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*/
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#define creat(path, mode) open(path, O_WRONLY|O_CREAT|O_TRUNC, mode)
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/********************************************************************************
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* Public Type Definitions
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********************************************************************************/
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/* struct flock is the third argument for F_GETLK, F_SETLK and F_SETLKW */
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struct flock
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{
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int16_t l_type; /* Type of lock: F_RDLCK, F_WRLCK, F_UNLCK */
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int16_t l_whence; /* How to interpret l_start: SEEK_SET, SEEK_CUR, SEEK_END */
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off_t l_start; /* Starting offset for lock */
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off_t l_len; /* Number of bytes to lock */
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pid_t l_pid; /* PID of process blocking our lock (F_GETLK only) */
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};
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/********************************************************************************
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* Public Function Prototypes
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********************************************************************************/
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#undef EXTERN
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#if defined(__cplusplus)
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/********************************************************************************
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* Public Data
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********************************************************************************/
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/* POSIX-like File System Interfaces */
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int open(FAR const char *path, int oflag, ...);
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int fcntl(int fd, int cmd, ...);
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#undef EXTERN
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#if defined(__cplusplus)
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}
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#endif
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#endif /* __INCLUDE_FCNTL_H */
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