https://invisible-island.net/xterm/xtoolkit/
XtAddInput, XtAddTimeOut, XtAddWorkProc - register input, timeout, and workprocs
#include <X11/Intrinsic.h> XtInputId XtAddInput(int source, XtPointer condition, XtInputCallback- Proc proc, XtPointer client_data); XtIntervalId XtAddTimeOut(unsigned long interval, XtTimerCallbackProc proc, XtPointer client_data); XtWorkProcId XtAddWorkProc(XtWorkProc proc, XtPointer client_data);
client_data Specifies the argument that is to be passed to the specified procedure when input is available condition Specifies the mask that indicates a read, write, or exception condition or some operating system dependent condition. proc Specifies the procedure that is to be called when input is available. source Specifies the source file descriptor on a UNIX-based system or other operating system dependent device specification.
XtAddInput has been replaced by XtAppAddInput. XtAddTimeOut has been replaced by XtAppAddTimeOut. XtAddWorkProc has been replaced by XtAppAddWorkProc.
XtAppAddInput(3), XtAppAddTimeOut(3), XtAppAddWorkProc(3) X Toolkit Intrinsics – C Language Interface Xlib - C Language X Interface X Version 11 libXt 1.1.5.2 XtAddInput(3)