unregister_callback(9r) [osf1 man page]

unregister_callback(9r) 												   unregister_callback(9r)

NAME

       unregister_callback - General: Deregisters a configuration callback routine

SYNOPSIS

       int unregister_callback(
	       void (*function) (),
	       int point,
	       int order,
	       ulong argument );

ARGUMENTS

       Specifies the name of the routine that you want to deregister.  You must have previously registered this callback routine by calling regis-
       ter_callback.  Specifies the execution point at which the kernel calls the callback routine previously registered by calling register_call-
       back. The execution point you pass to this argument must match the value you passed to the point argument in the call to register_callback.
       Specifies the order value that you specified in a previous call to register_callback.  Specifies an argument that you want  the	kernel	to
       pass to the callback routine that you previously registered by calling register_callback. The argument you pass to this argument must match
       the value you passed to argument in the call to register_callback. You would pass the integer constant 0L if you passed this in the  previ-
       ous call to register_callback to indicate there is no argument.

DESCRIPTION

       The  unregister_callback  routine deregisters a kernel module's configuration callback routine. The kernel module previously registered its
       routine or routines by calling the register_callback routine. The values you pass to unregister_callback must be the same ones  you  previ-
       ously passed to register_callback to deregister a specific routine. Kernel modules call unregister_callback to deregister the callback rou-
       tine when it is no longer needed.

       A kernel module typically calls unregister_callback when it encounters a fatal error during static or  dynamic  configuration.  The  cfgmgr
       framework  executes  callback routines scheduled to run after single-user mode each time the system goes from multiuser mode to single-user
       mode and back to multiuser mode. You should unregister any callback routines if you do not want this to occur.

NOTES

       The kernel maintains an internal callback list that stores the values you pass to the register_callback	routine.  These  callbacks  remain
       registered until the user removes them.

       The  unregister_callback  routine searches through the callback list for the specified callback routine, the specified point, the specified
       order, and the specified argument and removes that routine from the list.

RETURN VALUES

       Upon successful completion, the unregister_callback routine returns the value ESUCCESS.

       Otherwise, unregister_callback returns the following error constant, defined in /usr/sys/include/sys/errno.h: The value you passed  to  the
       point  argument	is  outside  the minimum and maximum range.  The callback you specified to be removed does not exist in the callback list.
       The callback you specified to be removed does not exist in the callback list.

FILES

SEE ALSO

       Routines: register_callback(9r)

															   unregister_callback(9r)

Check Out this Related Man Page

glutDisplayFunc(3GLUT)						       GLUT						    glutDisplayFunc(3GLUT)

NAME

       glutDisplayFunc - sets the display callback for the current window.

SYNTAX

       #include <GLUT/glut.h>

       void glutDisplayFunc(void (*func)(void));

ARGUMENTS

       func	 The new display callback function.

DESCRIPTION

       glutDisplayFunc	sets  the  display callback for the current window.  When GLUT determines that the normal plane for the window needs to be
       redisplayed, the display callback for the window is called. Before the callback, the current window is set to  the  window  needing  to	be
       redisplayed  and (if no overlay display callback is registered) the layer in use is set to the normal plane. The display callback is called
       with no parameters. The entire normal plane region should be redisplayed in response to the callback (this includes  ancillary  buffers	if
       your program depends on their state).

       GLUT  determines  when the display callback should be triggered based on the window's redisplay state. The redisplay state for a window can
       be either set explicitly by calling glutPostRedisplay or implicitly as the result of window damage reported by the window system.  Multiple
       posted redisplays for a window are coalesced by GLUT to minimize the number of display callbacks called.

       When  an  overlay is established for a window, but there is no overlay display callback registered, the display callback is used for redis-
       playing both the overlay and normal plane (that is, it will be called if either the redisplay state or overlay redisplay state is set).	In
       this case, the layer in use is not implicitly changed on entry to the display callback.

       See glutOverlayDisplayFunc to understand how distinct callbacks for the overlay and normal plane of a window may be established.

       When  a window is created, no display callback exists for the window. It is the responsibility of the programmer to install a display call-
       back for the window before the window is shown. A display callback must be registered for any window that is shown.  If	a  window  becomes
       displayed  without  a  display  callback being registered, a fatal error occurs. Passing NULL to glutDisplayFunc is illegal as of GLUT 3.0;
       there is no way to ``deregister'' a display callback (though another callback routine can always be registered).

       Upon return from the display callback, the normal damaged state of the window (returned	by  calling  glutLayerGet(GLUT_NORMAL_DAMAGED)	is
       cleared.  If  there  is	no  overlay  display  callback	registered the overlay damaged state of the window (returned by calling glutLayer-
       Get(GLUT_OVERLAY_DAMAGED) is also cleared.

SEE ALSO

       glutCreateMenu, glutPostRedisplay, glutOverlayDisplayFunc

AUTHOR

       Mark J. Kilgard (mjk@nvidia.com)

GLUT
									3.7						    glutDisplayFunc(3GLUT)

Linux and UNIX Man Pages

unregister_callback(9r) [osf1 man page]

Check Out this Related Man Page