source: rtems/c/src/lib/libc/write.c @ ddaa60f

4.104.114.84.95
Last change on this file since ddaa60f was 73f6236, checked in by Joel Sherrill <joel.sherrill@…>, on 03/01/99 at 22:40:08

Patch from Eric Norum <eric@…> to eliminate external
IO handlers scheme that was implemented originally just to support
sockets. The file system IO switch is more general and works fine.

  • Property mode set to 100644
File size: 1.4 KB
Line 
1/*
2 *  write() - POSIX 1003.1b 6.4.2 - Write to a File
3 *
4 *  COPYRIGHT (c) 1989-1998.
5 *  On-Line Applications Research Corporation (OAR).
6 *  Copyright assigned to U.S. Government, 1994.
7 *
8 *  The license and distribution terms for this file may be
9 *  found in the file LICENSE in this distribution or at
10 *  http://www.OARcorp.com/rtems/license.html.
11 *
12 *  $Id$
13 */
14
15#include "libio_.h"
16
17
18/*
19 * write
20 *
21 * This routine writes count bytes from from buffer pointed to by buffer
22 * to the file associated with the open file descriptor, fildes.
23 */
24
25ssize_t write(
26  int         fd,
27  const void *buffer,
28  size_t      count
29)
30{
31  rtems_status_code  rc;
32  rtems_libio_t     *iop;
33
34  rtems_libio_check_fd( fd );
35  iop = rtems_libio_iop( fd );
36  rtems_libio_check_is_open(iop);
37  rtems_libio_check_buffer( buffer );
38  rtems_libio_check_count( count );
39  rtems_libio_check_permissions( iop, LIBIO_FLAGS_WRITE );
40
41  /*
42   *  Now process the write() request.
43   */
44
45  if ( !iop->handlers->write )
46    set_errno_and_return_minus_one( ENOTSUP );
47
48  rc = (*iop->handlers->write)( iop, buffer, count );
49
50  if ( rc > 0 )
51    iop->offset += rc;
52
53  return rc;
54}
55
56/*
57 *  _write_r
58 *
59 *  This is the Newlib dependent reentrant version of write().
60 */
61
62#if defined(RTEMS_NEWLIB)
63
64#include <reent.h>
65
66long _write_r(
67  struct _reent *ptr,
68  int            fd,
69  const void    *buf,
70  size_t         nbytes
71)
72{
73  return write( fd, buf, nbytes );
74}
75#endif
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