/******************************************************************************** * include/fcntl.h * * Copyright (C) 2007-2009, 2012 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ********************************************************************************/ #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_BINARY (1 << 8) /* Open the file in binary (untranslated) mode. */ #define O_DIRECT (1 << 9) /* Avoid caching, write directly to hardware */ /* 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_TEXT 0 /* Open the file in text (translated) 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 */ /* 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 */ /* close-on-exec flag for F_GETRL and F_SETFL */ #define FD_CLOEXEC 1 /* 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 */ /* 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) /******************************************************************************** * 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(const char *path, int oflag, ...); int fcntl(int fd, int cmd, ...); #undef EXTERN #if defined(__cplusplus) } #endif #endif /* __INCLUDE_FCNTL_H */