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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libc/] [read.c] - Blame information for rev 173

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1 30 unneback
/*
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 *  read() - POSIX 1003.1b 6.4.1 - Read From a File
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 *
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 *  COPYRIGHT (c) 1989-1999.
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 *  On-Line Applications Research Corporation (OAR).
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 *
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 *  The license and distribution terms for this file may be
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 *  found in the file LICENSE in this distribution or at
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 *  http://www.OARcorp.com/rtems/license.html.
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 *
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 *  $Id: read.c,v 1.2 2001-09-27 12:01:15 chris Exp $
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 */
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#include "libio_.h"
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ssize_t read(
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  int         fd,
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  void       *buffer,
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  size_t      count
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)
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{
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  int             rc;  /* XXX change to a size_t when prototype is fixed */
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  rtems_libio_t *iop;
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  rtems_libio_check_fd( fd );
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  iop = rtems_libio_iop( fd );
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  rtems_libio_check_is_open(iop);
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  rtems_libio_check_buffer( buffer );
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  rtems_libio_check_count( count );
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  rtems_libio_check_permissions( iop, LIBIO_FLAGS_READ );
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  /*
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   *  Now process the read().
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   */
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  if ( !iop->handlers->read )
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    set_errno_and_return_minus_one( ENOTSUP );
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  rc = (*iop->handlers->read)( iop, buffer, count );
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  if ( rc > 0 )
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    iop->offset += rc;
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  return rc;
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}
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/*
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 *  _read_r
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 *
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 *  This is the Newlib dependent reentrant version of read().
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 */
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#if defined(RTEMS_NEWLIB)
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#include <reent.h>
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_ssize_t _read_r(
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  struct _reent *ptr,
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  int            fd,
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  void          *buf,
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  size_t         nbytes
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)
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{
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  return read( fd, buf, nbytes );
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}
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#endif

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