XtAppAddInput(3) XT FUNCTIONS XtAppAddInput(3)

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 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 Intrinsics read routine to stop
watching for input from the input source.

SEE ALSO

XtAppAddTimeOut(3),XtAppAddSignal(3)
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);

X Version 11 libXt 1.1.5 XtAppAddInput(3)