XtAppAddInput, XtRemoveInput - register and remove an input source
#include <X11/Intrinsic.h>
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(3),XtAppAddSignal(3)
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);