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/*
* read() - POSIX 1003.1b 6.4.1 - Read From a File
*
* COPYRIGHT (c) 1989-1998.
* On-Line Applications Research Corporation (OAR).
* Copyright assigned to U.S. Government, 1994.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#include "libio_.h"
ssize_t read(
int fd,
void *buffer,
size_t count
)
{
int rc; /* XXX change to a size_t when prototype is fixed */
rtems_libio_t *iop;
rtems_libio_check_fd( fd );
iop = rtems_libio_iop( fd );
rtems_libio_check_is_open(iop);
rtems_libio_check_buffer( buffer );
rtems_libio_check_count( count );
rtems_libio_check_permissions( iop, LIBIO_FLAGS_READ );
/*
* Now process the read().
*/
if ( !iop->handlers->read )
set_errno_and_return_minus_one( ENOTSUP );
rc = (*iop->handlers->read)( iop, buffer, count );
if ( rc > 0 )
iop->offset += rc;
return rc;
}
/*
* _read_r
*
* This is the Newlib dependent reentrant version of read().
*/
#if defined(RTEMS_NEWLIB)
#include <reent.h>
_ssize_t _read_r(
struct _reent *ptr,
int fd,
void *buf,
size_t nbytes
)
{
return read( fd, buf, nbytes );
}
#endif
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