66 lines
2.3 KiB
C
66 lines
2.3 KiB
C
/****************************************************************************
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* include/nuttx/fs/uio.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_NUTTX_FS_UIO_H
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#define __INCLUDE_NUTTX_FS_UIO_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <sys/types.h>
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/****************************************************************************
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* Public Type Definitions
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****************************************************************************/
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/* The structure to describe an user I/O operation.
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*
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* At this point, this is a bare minimum for readv/writev.
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* In the future, we might extend this for other things like
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* the file offset for pread/pwrite.
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*
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* This structure was inspired by BSDs.
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* (Thus it doesn't have the NuttX-style "_s" suffix.)
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*/
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struct uio
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{
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FAR const struct iovec *uio_iov;
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int uio_iovcnt;
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};
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: uio_total_len
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*
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* Description:
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* Return the total length of data in bytes.
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* Or -EOVERFLOW.
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*
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****************************************************************************/
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ssize_t uio_total_len(FAR const struct uio *uio);
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#endif /* __INCLUDE_NUTTX_FS_UIO_H */
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