/**************************************************************************** * include/aio.h * * Copyright (C) 2014 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_AIO_H #define __INCLUDE_AIO_H /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /* Configuration ************************************************************/ /* These interfaces are not available to kernel code */ #if !defined(CONFIG_BUILD_FLAT) && defined(__KERNEL__) # undef CONFIG_FS_AIO #endif /* Work queue support is required. The low-priority work queue is required * so that the asynchronous I/O does not interfere with high priority driver * operations. If this pre-requisite is met, then asynchronous I/O support * can be enabled with CONFIG_FS_AIO */ #ifdef CONFIG_FS_AIO #ifndef CONFIG_SCHED_WORKQUEUE # error Asynchronous I/O requires CONFIG_SCHED_WORKQUEUE #endif #ifndef CONFIG_SCHED_LPWORK # error Asynchronous I/O requires CONFIG_SCHED_LPWORK #endif /* Standard Definitions *****************************************************/ /* aio_cancel return values * * AIO_ALLDONE - Indicates that none of the requested operations could * be cancelled since they are already complete. * AIO_CANCELED - Indicates that all requested operations have been * cancelled. * AIO_NOTCANCELED - Indicates that some of the requested operations could * not be cancelled since they are in progress. */ #define AIO_CANCELED 0 #define AIO_ALLDONE 1 #define AIO_NOTCANCELED 2 /* lio_listio element operations * * LIO_NOP - Indicates that no transfer is requested. * LIO_READ - Requests a read operation. * LIO_WRITE - Requests a write operation. */ #define LIO_NOP 0 #define LIO_READ 1 #define LIO_WRITE 2 /* lio_listio modes * * LIO_NOWAIT - Indicates that the calling thread is to continue * execution while the lio_listio() operation is being * performed, and no notification is given when the * operation is complete. * LIO_WAIT - Indicates that the calling thread is to suspend until * the lio_listio() operation is complete. */ #define LIO_NOWAIT 0 #define LIO_WAIT 1 /**************************************************************************** * Type Definitions ****************************************************************************/ struct aiocb { /* Standard fields required by POSIX */ struct sigevent aio_sigevent; /* Signal number and value */ FAR volatile void *aio_buf; /* Location of buffer */ off_t aio_offset; /* File offset */ size_t aio_nbytes; /* Length of transfer */ #if (CONFIG_NFILE_DESCRIPTORS + CONFIG_NSOCKET_DESCRIPTORS) > 127 int16_t aio_fildes; /* File descriptor (should be int) */ #else int8_t aio_fildes; /* File descriptor (should be int) */ #endif int8_t aio_reqprio; /* Request priority offset (not used, should be int) */ uint8_t aio_lio_opcode; /* Operation to be performed (should be int) */ /* Non-standard, implementation-dependent data. For portability reasons, * application code should never reference these elements. */ struct sigwork_s aio_sigwork; /* Signal work */ volatile ssize_t aio_result; /* Support for aio_error() and aio_return() */ FAR void *aio_priv; /* Used by signal handlers */ }; /**************************************************************************** * Public Data ****************************************************************************/ #ifdef __cplusplus #define EXTERN extern "C" extern "C" { #else #define EXTERN extern #endif /**************************************************************************** * Public Function Prototypes ****************************************************************************/ int aio_cancel(int fildes, FAR struct aiocb *aiocbp); int aio_error(FAR const struct aiocb *aiocbp); int aio_fsync(int op, FAR struct aiocb *aiocbp); int aio_read(FAR struct aiocb *aiocbp); ssize_t aio_return(FAR struct aiocb *aiocbp); int aio_suspend(FAR const struct aiocb * const list[], int nent, FAR const struct timespec *timeout); int aio_write(FAR struct aiocb *aiocbp); int lio_listio(int mode, FAR struct aiocb * const list[], int nent, FAR struct sigevent *sig); #undef EXTERN #ifdef __cplusplus } #endif #endif /* CONFIG_FS_AIO */ #endif /* __INCLUDE_AIO_H */