rom/exec/closelibrary.c

   1 /*
   2     Copyright © 1995-2007, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Close a library.
   6     Lang: english
   7 */
   8 #include <aros/config.h>
   9 #include <exec/execbase.h>
  10 #include <dos/dos.h>
  11 #include <aros/libcall.h>
  12 #include <proto/exec.h>
  13
  14 #include "exec_debug.h"
  15 #ifndef DEBUG_CloseLibrary
  16 #   define DEBUG_CloseLibrary 0
  17 #endif
  18 #undef DEBUG
  19 #if DEBUG_CloseLibrary
  20 #   define DEBUG 1
  21 #endif
  22 #include <aros/debug.h>
  23 #undef kprintf
  24
  25 /*****************************************************************************
  26
  27     NAME */
  28
  29         AROS_LH1(void, CloseLibrary,
  30
  31 /*  SYNOPSIS */
  32         AROS_LHA(struct Library *, library, A1),
  33
  34 /*  LOCATION */
  35         struct ExecBase *, SysBase, 69, Exec)
  36
  37 /*  FUNCTION
  38         Closes a previously opened library. It is legal to call this function
  39         with a NULL pointer.
  40
  41     INPUTS
  42         library - Pointer to library structure or NULL.
  43
  44     RESULT
  45
  46     NOTES
  47
  48     EXAMPLE
  49
  50     BUGS
  51
  52     SEE ALSO
  53         OpenLibrary()
  54
  55     INTERNALS
  56
  57 ******************************************************************************/
  58 {
  59     AROS_LIBFUNC_INIT
  60     BPTR seglist;
  61
  62     D(bug("CloseLibrary $%lx (\"%s\") by \"%s\"\n", library,
  63         library ? library->lib_Node.ln_Name : "(null)",
  64         GET_THIS_TASK->tc_Node.ln_Name));
  65
  66     /* Something to do? */
  67     if(library!=NULL)
  68     {
  69         ASSERT_VALID_PTR(library);
  70
  71         /* Single-thread the close routine. */
  72         Forbid();
  73
  74         /* Do the close */
  75         seglist = AROS_LVO_CALL0(BPTR,struct Library *,library,2,);
  76         /*
  77             Normally you'd expect the library to be expunged if this returns
  78             non-zero, but this is only exec which doesn't know anything about
  79             seglists - therefore dos.library has to SetFunction() into this
  80             vector for the additional functionality.
  81         */
  82
  83         /* All done. */
  84         Permit();
  85     }
  86     else
  87     {
  88         /* Local vars not guaranteed to be initialised to 0. I initialise
  89            it here to save an assignment in case the close went ok (common
  90            path optimization). */
  91         seglist = 0;
  92     }
  93
  94     AROS_COMPAT_SETD0(seglist);
  95     AROS_LIBFUNC_EXIT
  96 } /* CloseLibrary */
  97