https://invisible-island.net/xterm/xtoolkit/
XtGetSelectionParameters - retrieve target parameters for a selection
request with a single target
#include <X11/Intrinsic.h>
void XtGetSelectionParameters(Widget owner, Atom selection, XtRequestId
request_id, Atom *type_return, XtPointer *value_return, unsigned
long *length_return, int *format_return);
owner Specifies the widget that owns the specified selection.
selection Specifies the selection being processed.
request_id
Specifies the requestor id in the case of incremental selec-
tions, or NULL in the case of atomic transfers.
type_return
Specifies a pointer to an atom in which the property type of
the parameters will be stored.
value_return
Specifies a pointer into which a pointer to the parameters
are to be stored. A NULL will be stored if no parameters
accompany the request.
length_return
Specifies a pointer into which the number of data elements in
value_return of size indicated by format_return will be
stored.
format_return
Specifies a pointer into which the size in bits of the param-
eter data in the elements of value_return will be stored.
XtGetSelectionParameters may only be called from within an XtConvertSe-
lectionProc or from within the last call to an XtConvertSelectionIncr-
Proc with a new request_id.
XtSetSelectionParameters(3)
X Toolkit Intrinsics – C Language Interface
Xlib - C Language X Interface
X Version 11 libXt 1.1.5.2 XtGetSelectionParameters(3)