gtk:entry-set-icon-from-icon-name (entry pos name)

entry -- a gtk:entry widget
pos -- a gtk:entry-icon-position value
name -- a string with the icon name, or nil

Sets the icon shown in the entry at the specified position from the current icon theme. If the icon name is not known, a "broken image" icon will be displayed instead. If the icon-name argument is nil, no icon will be shown in the specified position.