XmTextCopy man page
XmTextCopy — A Text function that copies the primary selection to the clipboard
#include <Xm/Text.h> Boolean XmTextCopy( Widget widget, Time time);
XmTextCopy copies the primary selected text to the clipboard.
This routine calls the XmNconvertCallback procedures, possibly multiple times, with the selection member of the XmConvertCallbackStruct set to CLIPBOARD and with the parm member set to XmCOPY.
Specifies the Text widget ID.
Specifies the server time at which the selection value is to be modified. This should be the time of the event which triggered this request. One source of a valid time stamp is the function XtLastTimestampProcessed().
For a complete definition of Text and its associated resources, see XmText(3).
This function returns False if the primary selection is NULL, if the widget does not own the primary selection, if the function is unable to gain ownership of the clipboard selection, or if no data is placed on the clipboard. Otherwise, it returns True.