source: rtems/c/src/exec/libcsupport/src/write.c @ cca4400

4.104.114.84.9
Last change on this file since cca4400 was cca4400, checked in by Joel Sherrill <joel.sherrill@…>, on Dec 10, 1998 at 11:31:54 PM

Merged Eric Norum's select patch that was based on 4.0 and resolved
all conflicts.

  • Property mode set to 100644
File size: 2.0 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
25/* XXX newlib has the prototype for this wrong.  It will be a bit painful */
26/* XXX to fix so we are choosing to delay fixing this. */
27
28int write(                        /* XXX this should return a ssize_t */
29  int         fd,
30  const void *buffer,
31  unsigned32  count               /* XXX this should be a size_t */
32)
33{
34  rtems_status_code  rc;
35  rtems_libio_t     *iop;
36
37  rtems_libio_check_fd( fd );
38  iop = rtems_libio_iop( fd );
39  rtems_libio_check_buffer( buffer );
40  rtems_libio_check_count( count );
41  rtems_libio_check_permissions( iop, LIBIO_FLAGS_WRITE );
42
43  /*
44   *  If this file descriptor is mapped to an external set of handlers,
45   *  then pass the request on to them.
46   */
47
48  if ( iop->flags & LIBIO_FLAGS_HANDLER_MASK ) {
49    rtems_libio_write_t fp;
50
51    fp = rtems_libio_handlers[
52           (iop->flags >> LIBIO_FLAGS_HANDLER_SHIFT) - 1].write;
53    if ( fp == NULL )
54      set_errno_and_return_minus_one( EBADF );
55
56    return (*fp)( fd, buffer, count );
57  }
58
59  /*
60   *  Now process the write() request.
61   */
62
63  if ( !iop->handlers->write )
64    set_errno_and_return_minus_one( ENOTSUP );
65
66  rc = (*iop->handlers->write)( iop, buffer, count );
67
68  if ( rc > 0 )
69    iop->offset += rc;
70
71  return rc;
72}
73
74/*
75 *  _write_r
76 *
77 *  This is the Newlib dependent reentrant version of write().
78 */
79
80#if defined(RTEMS_NEWLIB)
81
82#include <reent.h>
83
84long _write_r(
85  struct _reent *ptr,
86  int            fd,
87  const void    *buf,
88  size_t         nbytes
89)
90{
91  return write( fd, buf, nbytes );
92}
93#endif
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