source: rtems/c/src/lib/libc/lseek.c @ 3eec211

4.104.114.84.95
Last change on this file since 3eec211 was 3ba74c73, checked in by Joel Sherrill <joel.sherrill@…>, on 11/01/00 at 21:08:14

2000-11-01 Joel Sherrill <joel@…>

  • include/Makefile.am, include/rtems/libio_.h, libc/Makefile.am, libc/assoc.c, libc/assocnamebad.c, libc/base_fs.c, libc/cfsetispeed.c, libc/cfsetospeed.c, libc/chdir.c, libc/chmod.c, libc/chown.c, libc/close.c, libc/closedir.c, libc/dup2.c, libc/error.c, libc/eval.c, libc/fchdir.c, libc/fchmod.c, libc/fcntl.c, libc/fdatasync.c, libc/fpathconf.c, libc/fstat.c, libc/fsync.c, libc/ftruncate.c, libc/getdents.c, libc/ioctl.c, libc/libio.c, libc/libio_sockets.c, libc/link.c, libc/lseek.c, libc/malloc.c, libc/mallocfreespace.c, libc/mknod.c, libc/mount.c, libc/newlibc.c, libc/no_libc.c, libc/open.c, libc/read.c, libc/readlink.c, libc/rmdir.c, libc/stat.c, libc/symlink.c, libc/tcsetattr.c, libc/telldir.c, libc/ttyname.c, libc/ttyname_r.c, libc/umask.c, libc/unlink.c, libc/unmount.c, libc/utime.c, libc/write.c: assoc.h, error.h, libio_.h, libio.h, and libcsupport.h moved from libc to lib/include/rtems and now must be referenced as <rtems/XXX.h>.
  • include/rtems/Makefile.am, include/rtems/.cvsignore: New file.
  • include/rtems/assoc.h, include/rtems/error.h, include/rtems/libcsupport.h, include/rtems/libio.h, include/rtems/libio_.h: New/moved files.
  • Property mode set to 100644
File size: 1.3 KB
Line 
1/*
2 *  lseek() - POSIX 1003.1b 6.5.3 - Reposition Read/Write File Offset
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 <stdio.h>
15
16#include <rtems/libio_.h>
17
18off_t lseek(
19  int     fd,
20  off_t   offset,
21  int     whence
22)
23{
24  rtems_libio_t *iop;
25
26  rtems_libio_check_fd( fd );
27  iop = rtems_libio_iop( fd );
28  rtems_libio_check_is_open(iop);
29
30  /*
31   *  Now process the lseek().
32   */
33
34  switch ( whence ) {
35    case SEEK_SET:
36      iop->offset = offset;
37      break;
38
39    case SEEK_CUR:
40      iop->offset += offset;
41      break;
42
43    case SEEK_END:
44      iop->offset = iop->size - offset;
45      break;
46
47    default:
48      errno = EINVAL;
49      return -1;
50  }
51
52  if ( !iop->handlers->lseek_h )
53    set_errno_and_return_minus_one( ENOTSUP );
54
55  return (*iop->handlers->lseek_h)( iop, offset, whence );
56}
57
58/*
59 *  _lseek_r
60 *
61 *  This is the Newlib dependent reentrant version of lseek().
62 */
63
64#if defined(RTEMS_NEWLIB)
65
66#include <reent.h>
67
68off_t _lseek_r(
69  struct _reent *ptr,
70  int            fd,
71  off_t          offset,
72  int            whence
73)
74{
75  return lseek( fd, offset, whence );
76}
77#endif
78
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