/**************************************************************************** * 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 #include #include /**************************************************************************** * 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_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. */ /* 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 */