source: rtems/c/src/lib/libc/write.c @ e22d644

4.104.114.84.9
Last change on this file since e22d644 was e22d644, checked in by Joel Sherrill <joel.sherrill@…>, on Dec 14, 1998 at 11:01:43 PM

Corrected prototype to confirm to POSIX 1003.1b.

  • Property mode set to 100644
File size: 1.8 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_buffer( buffer );
37  rtems_libio_check_count( count );
38  rtems_libio_check_permissions( iop, LIBIO_FLAGS_WRITE );
39
40  /*
41   *  If this file descriptor is mapped to an external set of handlers,
42   *  then pass the request on to them.
43   */
44
45  if ( iop->flags & LIBIO_FLAGS_HANDLER_MASK ) {
46    rtems_libio_write_t fp;
47
48    fp = rtems_libio_handlers[
49           (iop->flags >> LIBIO_FLAGS_HANDLER_SHIFT) - 1].write;
50    if ( fp == NULL )
51      set_errno_and_return_minus_one( EBADF );
52
53    return (*fp)( fd, buffer, count );
54  }
55
56  /*
57   *  Now process the write() request.
58   */
59
60  if ( !iop->handlers->write )
61    set_errno_and_return_minus_one( ENOTSUP );
62
63  rc = (*iop->handlers->write)( iop, buffer, count );
64
65  if ( rc > 0 )
66    iop->offset += rc;
67
68  return rc;
69}
70
71/*
72 *  _write_r
73 *
74 *  This is the Newlib dependent reentrant version of write().
75 */
76
77#if defined(RTEMS_NEWLIB)
78
79#include <reent.h>
80
81long _write_r(
82  struct _reent *ptr,
83  int            fd,
84  const void    *buf,
85  size_t         nbytes
86)
87{
88  return write( fd, buf, nbytes );
89}
90#endif
Note: See TracBrowser for help on using the repository browser.