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/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @brief Read From a File
* @ingroup libcsupport
*/
/*
* COPYRIGHT (c) 1989-2011.
* On-Line Applications Research Corporation (OAR).
*
* 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.
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/libio_.h>
#include <rtems/seterr.h>
/**
* POSIX 1003.1b 6.4.1 - Read From a File
*/
ssize_t read(
int fd,
void *buffer,
size_t count
)
{
rtems_libio_t *iop;
ssize_t n;
rtems_libio_check_buffer( buffer );
rtems_libio_check_count( count );
LIBIO_GET_IOP_WITH_ACCESS( fd, iop, LIBIO_FLAGS_READ, EBADF );
/*
* Now process the read().
*/
n = (*iop->pathinfo.handlers->read_h)( iop, buffer, count );
rtems_libio_iop_drop( iop );
return n;
}
#if defined(RTEMS_NEWLIB) && !defined(HAVE__READ_R)
#include <reent.h>
/**
* This is the Newlib dependent reentrant version of read().
*/
ssize_t _read_r(
struct _reent *ptr RTEMS_UNUSED,
int fd,
void *buf,
size_t nbytes
)
{
return read( fd, buf, nbytes );
}
#endif
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