219 lines
9.2 KiB
C
219 lines
9.2 KiB
C
/****************************************************************************
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* include/fcntl.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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_TEXT (1 << 8) /* Open the file in text (translated) 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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#define O_DIRECTORY (1 << 11) /* Must be a directory */
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#define O_NOFOLLOW (1 << 12) /* Don't follow links */
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#define O_NOATIME (1 << 18) /* Don't update the file last access time */
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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_BINARY 0 /* Open the file in binary (untranslated) 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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#define F_GETPATH 15 /* Get the path of the file descriptor(BSD/macOS) */
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#define F_ADD_SEALS 16 /* Add the bit-mask argument arg to the set of seals of the inode */
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#define F_GET_SEALS 17 /* Get (as the function result) the current set of seals of the inode */
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#define F_DUPFD_CLOEXEC 18 /* Duplicate file descriptor with close-on-exit set. */
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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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/* Operations for bsd flock(), also used by the kernel implementation */
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#define LOCK_SH 1 /* Shared lock */
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#define LOCK_EX 2 /* Exclusive lock */
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#define LOCK_NB 4 /* Or'd with one of the above to prevent blocking */
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#define LOCK_UN 8 /* Remove lock */
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/* close-on-exec flag for F_GETFD and F_SETFD */
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#define FD_CLOEXEC 1
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/* The flag for openat, faccessat, ... */
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#define AT_FDCWD -100 /* Special value used to indicate openat should use the current
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* working directory.
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*/
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#define AT_SYMLINK_NOFOLLOW 0x0100 /* Do not follow symbolic links. */
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#define AT_EACCESS 0x0200 /* Test access permitted for effective IDs, not real IDs. */
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#define AT_REMOVEDIR 0x0200 /* Remove directory instead of unlinking file. */
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#define AT_SYMLINK_FOLLOW 0x0400 /* Follow symbolic links. */
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#define AT_NO_AUTOMOUNT 0x0800 /* Suppress terminal automount traversal */
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#define AT_EMPTY_PATH 0x1000 /* Allow empty relative pathname */
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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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/* Types of seals */
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#define F_SEAL_SEAL 0x0001 /* Prevent further seals from being set */
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#define F_SEAL_SHRINK 0x0002 /* Prevent file from shrinking */
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#define F_SEAL_GROW 0x0004 /* Prevent file from growing */
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#define F_SEAL_WRITE 0x0008 /* Prevent writes */
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#define F_SEAL_FUTURE_WRITE 0x0010 /* Prevent future writes while mapped */
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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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#if defined(CONFIG_FS_LARGEFILE)
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# define F_GETLK64 F_GETLK
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# define F_SETLK64 F_SETLK
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# define F_SETLKW64 F_SETLKW
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# define flock64 flock
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# define open64 open
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# define openat64 openat
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# define creat64 creat
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# define fallocate64 fallocate
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# define posix_fadvise64 posix_fadvise
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# define posix_fallocate64 posix_fallocate
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#endif
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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 openat(int dirfd, FAR const char *path, int oflag, ...);
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int fcntl(int fd, int cmd, ...);
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int posix_fallocate(int fd, off_t offset, off_t len);
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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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