XtAppSetExitFlag - Man Page

#include <X11/Intrinsic.h>

void XtAppSetExitFlag(XtAppContext app_context);

Boolean XtAppGetExitFlag(XtAppContext app_context);

app_context

Specifies the application context.

To indicate that an application context should exit, use XtAppSetExitFlag.

To test the exit status of an application context, use XtAppGetExitFlag.

X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface

The man page XtAppGetExitFlag(3) is an alias of XtAppSetExitFlag(3).