XtCallActionProc - invoke an action procedure directly
#include <X11/Intrinsic.h>
void XtCallActionProc(Widget widget, const char
    *action, XEvent *event, String *params, Cardinal
    num_params);
  - widget
- Specifies the widget in which the action is to be invoked. Must be of
      class core of any subclass thereof.
- action
- Specifies the name of the action routine.
- event
- Specifies the contents of the event passed to the action
    routine.
- params
- Specifies the contents of the params passed to the action
    routine.
- num_params
- Specifies the num of entries in params.
XtCallActionProc searches for the named action routine in the same manner
  and order as translation tables are bound. If found, the action routine is
  invoked with the specified widget, event pointer, and parameters. It is the
  responsibility of the caller to ensure that the contents of event,
  params, and num_params arguments are appropriate for the
  specified routine, and if necessary, that the specified widget is realized or
  sensitive. If the named action routine cannot be found,
  XtCallActionProc generates a warning message and returns.
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface