source: rtems/c/src/lib/libc/read.c @ fb16fed

4.104.114.84.95
Last change on this file since fb16fed was 08311cc3, checked in by Joel Sherrill <joel.sherrill@…>, on 11/17/99 at 17:51:34

Updated copyright notice.

  • Property mode set to 100644
File size: 1.2 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.OARcorp.com/rtems/license.html.
10 *
11 *  $Id$
12 */
13
14#include "libio_.h"
15
16ssize_t read(
17  int         fd,
18  void       *buffer,
19  size_t      count
20)
21{
22  int             rc;  /* XXX change to a size_t when prototype is fixed */
23  rtems_libio_t *iop;
24
25  rtems_libio_check_fd( fd );
26  iop = rtems_libio_iop( fd );
27  rtems_libio_check_is_open(iop);
28  rtems_libio_check_buffer( buffer );
29  rtems_libio_check_count( count );
30  rtems_libio_check_permissions( iop, LIBIO_FLAGS_READ );
31
32  /*
33   *  Now process the read().
34   */
35
36  if ( !iop->handlers->read )
37    set_errno_and_return_minus_one( ENOTSUP );
38
39  rc = (*iop->handlers->read)( iop, buffer, count );
40
41  if ( rc > 0 )
42    iop->offset += rc;
43
44  return rc;
45}
46
47/*
48 *  _read_r
49 *
50 *  This is the Newlib dependent reentrant version of read().
51 */
52
53#if defined(RTEMS_NEWLIB)
54
55#include <reent.h>
56
57_ssize_t _read_r(
58  struct _reent *ptr,
59  int            fd,
60  void          *buf,
61  size_t         nbytes
62)
63{
64  return read( fd, buf, nbytes );
65}
66#endif
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