rom/dos/maxcli.c

   1 /*
   2     Copyright © 1995-2010, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc:
   6     Lang: english
   7 */
   8 #include <exec/execbase.h>
   9 #include <proto/exec.h>
  10 #include <dos/dosextens.h>
  11
  12 /*****************************************************************************
  13
  14     NAME */
  15 #include <proto/dos.h>
  16
  17         AROS_LH0(ULONG, MaxCli,
  18
  19 /*  SYNOPSIS */
  20
  21 /*  LOCATION */
  22         struct DosLibrary *, DOSBase, 92, Dos)
  23
  24 /*  FUNCTION
  25         Returns the highest Cli number currently in use. Since processes
  26         may be added and removed at any time the returned value may already
  27         be wrong.
  28
  29     INPUTS
  30
  31     RESULT
  32         Maximum Cli number (_not_ the number of Clis).
  33
  34     NOTES
  35
  36     EXAMPLE
  37
  38     BUGS
  39
  40     SEE ALSO
  41
  42     INTERNALS
  43
  44 *****************************************************************************/
  45 {
  46     AROS_LIBFUNC_INIT
  47
  48     IPTR *taskarray = BADDR(DOSBase->dl_Root->rn_TaskArray);
  49     /*
  50        The first IPTR in the taskarray contains the size of the
  51        taskarray = the max. number of processes the taskarray
  52        can currently hold.
  53     */
  54     IPTR retval = taskarray[0];
  55
  56     /*
  57        Not all of the fields in the array may contain a valid
  58        pointer to a process and they might be NULL instead. So
  59        I search that array backwards until I find a valid entry.
  60     */
  61     while (retval && (IPTR)NULL != taskarray[retval])
  62         retval--;
  63
  64     return retval;
  65     AROS_LIBFUNC_EXIT
  66 } /* MaxCli */