XtAppAddInput
NAME
XtAppAddInput, XtRemoveInput - register and remove an input source
SYNTAX
XtInputId XtAppAddInput(XtAppContext app_context, int source,
XtPointer condition, XtInputCallbackProc proc, XtPointer
client_data);
void XtRemoveInput(XtInputId id);
ARGUMENTS
app_context
Specifies the application context .
client_data
Specifies the argument that is to be passed to the specified procedure
when .
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
call.
proc
Specifies the procedure that is.
source
Specifies the source file descriptor on a UNIX-based system
or other operating system dependent device specification.
DESCRIPTION
The
function registers with the 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.
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
and
The
function causes the read routine to stop watching for input
from the input source.
SEE ALSO
XtAppAddTimeOut(3Xt),XtAppAddSignal(3Xt)
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);
