222 lines
9.4 KiB
C
222 lines
9.4 KiB
C
/****************************************************************************
|
|
* include/fcntl.h
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifndef __INCLUDE_FCNTL_H
|
|
#define __INCLUDE_FCNTL_H
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <sys/types.h>
|
|
#include <stdint.h>
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
/* open flag settings for open() (and related APIs) */
|
|
|
|
#define O_RDONLY (1 << 0) /* Open for read access (only) */
|
|
#define O_RDOK O_RDONLY /* Read access is permitted (non-standard) */
|
|
#define O_WRONLY (1 << 1) /* Open for write access (only) */
|
|
#define O_WROK O_WRONLY /* Write access is permitted (non-standard) */
|
|
#define O_RDWR (O_RDOK|O_WROK) /* Open for both read & write access */
|
|
#define O_CREAT (1 << 2) /* Create file/sem/mq object */
|
|
#define O_EXCL (1 << 3) /* Name must not exist when opened */
|
|
#define O_APPEND (1 << 4) /* Keep contents, append to end */
|
|
#define O_TRUNC (1 << 5) /* Delete contents */
|
|
#define O_NONBLOCK (1 << 6) /* Don't wait for data */
|
|
#define O_NDELAY O_NONBLOCK /* Synonym for O_NONBLOCK */
|
|
#define O_SYNC (1 << 7) /* Synchronize output on write */
|
|
#define O_DSYNC O_SYNC /* Equivalent to OSYNC in NuttX */
|
|
#define O_TEXT (1 << 8) /* Open the file in text (translated) mode. */
|
|
#define O_DIRECT (1 << 9) /* Avoid caching, write directly to hardware */
|
|
#define O_CLOEXEC (1 << 10) /* Close on execute */
|
|
#define O_DIRECTORY (1 << 11) /* Must be a directory */
|
|
#define O_NOFOLLOW (1 << 12) /* Don't follow links */
|
|
#define O_LARGEFILE (1 << 13) /* Large File */
|
|
#define O_NOATIME (1 << 18) /* Don't update the file last access time */
|
|
|
|
/* Unsupported, but required open flags */
|
|
|
|
#define O_RSYNC 0 /* Synchronize input on read */
|
|
#define O_ACCMODE O_RDWR /* Mask for access mode */
|
|
#define O_NOCTTY 0 /* Required by POSIX */
|
|
#define O_BINARY 0 /* Open the file in binary (untranslated) mode. */
|
|
|
|
/* This is the highest bit number used in the open flags bitset. Bits above
|
|
* this bit number may be used within NuttX for other, internal purposes.
|
|
*/
|
|
|
|
#define _O_MAXBIT 8
|
|
|
|
/* Synonyms historically used as F_SETFL flags (BSD). */
|
|
|
|
#define FNDELAY O_NONBLOCK /* Don't wait for data */
|
|
#define FNONBLOCK O_NONBLOCK /* Don't wait for data */
|
|
#define FAPPEND O_APPEND /* Keep contents, append to end */
|
|
#define FSYNC O_SYNC /* Synchronize output on write */
|
|
#define FASYNC 0 /* No counterpart in NuttX */
|
|
|
|
/* FFCNTL is all the bits that may be set via fcntl. */
|
|
|
|
#define FFCNTL (FNONBLOCK | FNDELAY | FAPPEND | FSYNC | FASYNC)
|
|
|
|
/* fcntl() commands */
|
|
|
|
#define F_DUPFD 0 /* Duplicate a file descriptor */
|
|
#define F_GETFD 1 /* Read the file descriptor flags */
|
|
#define F_GETFL 2 /* Read the file status flags */
|
|
#define F_GETLEASE 3 /* Indicates what type of lease is held on fd (linux) */
|
|
#define F_GETLK 4 /* Check if we could place a lock */
|
|
#define F_GETOWN 5 /* Get the pid receiving SIGIO and SIGURG signals for fd */
|
|
#define F_GETSIG 6 /* Get the signal sent */
|
|
#define F_NOTIFY 7 /* Provide notification when directory referred to by fd changes (linux) */
|
|
#define F_SETFD 8 /* Set the file descriptor flags to value */
|
|
#define F_SETFL 9 /* Set the file status flags to the value */
|
|
#define F_SETLEASE 10 /* Set or remove file lease (linux) */
|
|
#define F_SETLK 11 /* Acquire or release a lock on range of bytes */
|
|
#define F_SETLKW 12 /* Like F_SETLK, but wait for lock to become available */
|
|
#define F_SETOWN 13 /* Set pid that will receive SIGIO and SIGURG signals for fd */
|
|
#define F_SETSIG 14 /* Set the signal to be sent */
|
|
#define F_GETPATH 15 /* Get the path of the file descriptor(BSD/macOS) */
|
|
#define F_ADD_SEALS 16 /* Add the bit-mask argument arg to the set of seals of the inode */
|
|
#define F_GET_SEALS 17 /* Get (as the function result) the current set of seals of the inode */
|
|
#define F_DUPFD_CLOEXEC 18 /* Duplicate file descriptor with close-on-exit set. */
|
|
#define F_SETPIPE_SZ 19 /* Modify the capacity of the pipe to arg bytes, but not larger than CONFIG_DEV_PIPE_MAXSIZE */
|
|
#define F_GETPIPE_SZ 20 /* Return the capacity of the pipe */
|
|
|
|
/* For posix fcntl() and lockf() */
|
|
|
|
#define F_RDLCK 0 /* Take out a read lease */
|
|
#define F_WRLCK 1 /* Take out a write lease */
|
|
#define F_UNLCK 2 /* Remove a lease */
|
|
|
|
/* Operations for bsd flock(), also used by the kernel implementation */
|
|
|
|
#define LOCK_SH 1 /* Shared lock */
|
|
#define LOCK_EX 2 /* Exclusive lock */
|
|
#define LOCK_NB 4 /* Or'd with one of the above to prevent blocking */
|
|
#define LOCK_UN 8 /* Remove lock */
|
|
|
|
/* close-on-exec flag for F_GETFD and F_SETFD */
|
|
|
|
#define FD_CLOEXEC 1
|
|
|
|
/* The flag for openat, faccessat, ... */
|
|
|
|
#define AT_FDCWD -100 /* Special value used to indicate openat should use the current
|
|
* working directory.
|
|
*/
|
|
#define AT_SYMLINK_NOFOLLOW 0x0100 /* Do not follow symbolic links. */
|
|
#define AT_EACCESS 0x0200 /* Test access permitted for effective IDs, not real IDs. */
|
|
#define AT_REMOVEDIR 0x0200 /* Remove directory instead of unlinking file. */
|
|
#define AT_SYMLINK_FOLLOW 0x0400 /* Follow symbolic links. */
|
|
#define AT_NO_AUTOMOUNT 0x0800 /* Suppress terminal automount traversal */
|
|
#define AT_EMPTY_PATH 0x1000 /* Allow empty relative pathname */
|
|
|
|
/* These are the notifications that can be received from F_NOTIFY (linux) */
|
|
|
|
#define DN_ACCESS 0 /* A file was accessed */
|
|
#define DN_MODIFY 1 /* A file was modified */
|
|
#define DN_CREATE 2 /* A file was created */
|
|
#define DN_DELETE 3 /* A file was unlinked */
|
|
#define DN_RENAME 4 /* A file was renamed */
|
|
#define DN_ATTRIB 5 /* Attributes of a file were changed */
|
|
|
|
/* Types of seals */
|
|
|
|
#define F_SEAL_SEAL 0x0001 /* Prevent further seals from being set */
|
|
#define F_SEAL_SHRINK 0x0002 /* Prevent file from shrinking */
|
|
#define F_SEAL_GROW 0x0004 /* Prevent file from growing */
|
|
#define F_SEAL_WRITE 0x0008 /* Prevent writes */
|
|
#define F_SEAL_FUTURE_WRITE 0x0010 /* Prevent future writes while mapped */
|
|
|
|
/* int creat(const char *path, mode_t mode);
|
|
*
|
|
* is equivalent to open with O_WRONLY|O_CREAT|O_TRUNC.
|
|
*/
|
|
|
|
#define creat(path, mode) open(path, O_WRONLY|O_CREAT|O_TRUNC, mode)
|
|
|
|
#if defined(CONFIG_FS_LARGEFILE)
|
|
# define F_GETLK64 F_GETLK
|
|
# define F_SETLK64 F_SETLK
|
|
# define F_SETLKW64 F_SETLKW
|
|
|
|
# define flock64 flock
|
|
# define open64 open
|
|
# define openat64 openat
|
|
# define creat64 creat
|
|
# define fallocate64 fallocate
|
|
# define posix_fadvise64 posix_fadvise
|
|
# define posix_fallocate64 posix_fallocate
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Public Type Definitions
|
|
****************************************************************************/
|
|
|
|
/* struct flock is the third argument for F_GETLK, F_SETLK and F_SETLKW */
|
|
|
|
struct flock
|
|
{
|
|
int16_t l_type; /* Type of lock: F_RDLCK, F_WRLCK, F_UNLCK */
|
|
int16_t l_whence; /* How to interpret l_start: SEEK_SET, SEEK_CUR, SEEK_END */
|
|
off_t l_start; /* Starting offset for lock */
|
|
off_t l_len; /* Number of bytes to lock */
|
|
pid_t l_pid; /* PID of process blocking our lock (F_GETLK only) */
|
|
};
|
|
|
|
/****************************************************************************
|
|
* Public Function Prototypes
|
|
****************************************************************************/
|
|
|
|
#undef EXTERN
|
|
#if defined(__cplusplus)
|
|
#define EXTERN extern "C"
|
|
extern "C"
|
|
{
|
|
#else
|
|
#define EXTERN extern
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Public Data
|
|
****************************************************************************/
|
|
|
|
/* POSIX-like File System Interfaces */
|
|
|
|
int open(FAR const char *path, int oflag, ...);
|
|
int openat(int dirfd, FAR const char *path, int oflag, ...);
|
|
int fcntl(int fd, int cmd, ...);
|
|
|
|
int posix_fallocate(int fd, off_t offset, off_t len);
|
|
|
|
#undef EXTERN
|
|
#if defined(__cplusplus)
|
|
}
|
|
#endif
|
|
|
|
#endif /* __INCLUDE_FCNTL_H */
|