rom/dos/samelock.c

   1 /*
   2     Copyright © 1995-2007, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc:
   6     Lang: english
   7 */
   8 #include "dos_intern.h"
   9
  10 /*****************************************************************************
  11
  12     NAME */
  13 #include <proto/dos.h>
  14
  15         AROS_LH2(LONG, SameLock,
  16
  17 /*  SYNOPSIS */
  18         AROS_LHA(BPTR, lock1, D1),
  19         AROS_LHA(BPTR, lock2, D2),
  20
  21 /*  LOCATION */
  22         struct DosLibrary *, DOSBase, 70, Dos)
  23
  24 /*  FUNCTION
  25
  26     INPUTS
  27
  28     RESULT
  29
  30     NOTES
  31
  32     EXAMPLE
  33
  34     BUGS
  35
  36     SEE ALSO
  37
  38     INTERNALS
  39
  40 *****************************************************************************/
  41 {
  42     AROS_LIBFUNC_INIT
  43
  44     struct IOFileSys iofs;
  45     struct FileHandle *fh1;
  46     struct FileHandle *fh2;
  47
  48     if(!SameDevice(lock1, lock2))
  49         return LOCK_DIFFERENT;
  50
  51     fh1 = (struct FileHandle *)BADDR(lock1);
  52     fh2 = (struct FileHandle *)BADDR(lock2);
  53
  54     /* Check if it is the same lock */
  55
  56     /* Prepare I/O request. */
  57     InitIOFS(&iofs, FSA_SAME_LOCK, DOSBase);
  58
  59     iofs.IOFS.io_Device = fh1->fh_Device;
  60     iofs.IOFS.io_Unit   = fh1->fh_Unit;
  61     iofs.io_Union.io_SAME_LOCK.io_Lock[0] = fh1->fh_Unit;
  62     iofs.io_Union.io_SAME_LOCK.io_Lock[1] = fh2->fh_Unit;
  63     iofs.io_Union.io_SAME_LOCK.io_Same = LOCK_DIFFERENT;
  64
  65     /* Send the request. */
  66     DosDoIO(&iofs.IOFS);
  67
  68     /* Set error code and return */
  69     SetIoErr(iofs.io_DosError);
  70
  71     if(iofs.io_DosError != 0)
  72         return LOCK_DIFFERENT;
  73     else
  74     {
  75         if(iofs.io_Union.io_SAME_LOCK.io_Same == LOCK_SAME)
  76             return LOCK_SAME;
  77         else
  78             return LOCK_SAME_VOLUME;
  79     }
  80
  81     return 0;
  82
  83     AROS_LIBFUNC_EXIT
  84 } /* SameLock */