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XtAppAddInput, XtRemoveInput - register
and remove an input source
- XtInputId XtAppAddInput(XtAppContext app_context,
int source,
- XtPointer condition, XtInputCallbackProc proc, XtPointer client_data);
- void XtRemoveInput(XtInputId id);
Specifies the application
context that identifies the application.
Specifies the argument that is
to be passed to the specified procedure when input is available.
Specifies
the mask that indicates a read, write, or exception condition or some operating
system dependent condition.
Specifies the ID returned from the corresponding
XtAppAddInput call.
Specifies the procedure that is to be called when input
is available.
Specifies the source file descriptor on a UNIX-based system
or other operating system dependent device specification.
The
XtAppAddInput function registers with the Intrinsics read routine a new
source of events, which is usually file input but can also be file output.
Note that file should be loosely interpreted to mean any sink or source
of data. XtAppAddInput also specifies the conditions under which the source
can generate events. When input is pending on this source, the callback
procedure is called.
The legal values for the condition argument are operating-system
dependent. On a UNIX-based system, the condition is some union of XtInputReadMask,
XtInputWriteMask, and XtInputExceptMask. The XtRemoveInput function
causes the Intrinsics read routine to stop watching for input from the
input source.
XtAppAddTimeOut(3Xt)
,XtAppAddSignal(3Xt)
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface
In ANSI C it is necessary to cast the
condition to an XtPointer, e.g.:
XtAppAddInput(app_context,
source,
(XtPointer) (XtInputReadMask | XtInputWriteMask),
proc,
client_data);
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