XtAppAddInput(3Xt) X Version 11 (Release 6.6) XtAppAddInput(3Xt)
NAME
XtAppAddInput, XtRemoveInput - register and remove an input
source
SYNTAX
XtInputId XtAppAddInput(app_context, source, condition,
proc, client_data)
XtAppContext app_context;
int source;
XtPointer condition;
XtInputCallbackProc proc;
XtPointer client_data;
void XtRemoveInput(id)
XtInputId id;
ARGUMENTS
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.
DESCRIPTION
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
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XtAppAddInput(3Xt) X Version 11 (Release 6.6) XtAppAddInput(3Xt)
Intrinsics read routine to stop watching for input from the
input source.
SEE ALSO
XtAppAddTimeOut(3Xt),XtAppAddSignal(3Xt)
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface
BUGS
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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