source: rtems/cpukit/libcsupport/src/read.c @ 7192476f

4.104.114.84.95
Last change on this file since 7192476f was 7192476f, checked in by Ralf Corsepius <ralf.corsepius@…>, on Dec 8, 2006 at 7:18:27 AM

Use size_t instead of uint32_t for read/write count-args.

  • Property mode set to 100644
File size: 1.3 KB
Line 
1/*
2 *  read() - POSIX 1003.1b 6.4.1 - Read From a File
3 *
4 *  COPYRIGHT (c) 1989-1999.
5 *  On-Line Applications Research Corporation (OAR).
6 *
7 *  The license and distribution terms for this file may be
8 *  found in the file LICENSE in this distribution or at
9 *  http://www.rtems.com/license/LICENSE.
10 *
11 *  $Id$
12 */
13
14#if HAVE_CONFIG_H
15#include "config.h"
16#endif
17
18#include <rtems/libio_.h>
19#include <rtems/seterr.h>
20
21ssize_t read(
22  int         fd,
23  void       *buffer,
24  size_t      count
25)
26{
27  ssize_t      rc;
28  rtems_libio_t *iop;
29
30  rtems_libio_check_fd( fd );
31  iop = rtems_libio_iop( fd );
32  rtems_libio_check_is_open(iop);
33  rtems_libio_check_buffer( buffer );
34  rtems_libio_check_count( count );
35  rtems_libio_check_permissions( iop, LIBIO_FLAGS_READ );
36
37  /*
38   *  Now process the read().
39   */
40
41  if ( !iop->handlers->read_h )
42    rtems_set_errno_and_return_minus_one( ENOTSUP );
43
44  rc = (*iop->handlers->read_h)( iop, buffer, count );
45
46  if ( rc > 0 )
47    iop->offset += rc;
48
49  return rc;
50}
51
52/*
53 *  _read_r
54 *
55 *  This is the Newlib dependent reentrant version of read().
56 */
57
58#if defined(RTEMS_NEWLIB)
59
60#include <reent.h>
61
62ssize_t _read_r(
63  struct _reent *ptr,
64  int            fd,
65  void          *buf,
66  size_t         nbytes
67)
68{
69  return read( fd, buf, nbytes );
70}
71#endif
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