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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);
- app_context
- Specifies the application
context that identifies the application.
- 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.
- id
- Specifies the
ID returned from the corresponding XtAppAddInput call.
- 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.
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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