DEV_NULL         1086 ext/tk/tcltklib.c       	chan = Tcl_OpenFileChannel(NULL, DEV_NULL, "r", 0);
DEV_NULL         1094 ext/tk/tcltklib.c       	chan = Tcl_OpenFileChannel(NULL, DEV_NULL, "w", 0);
DEV_NULL         1102 ext/tk/tcltklib.c       	chan = Tcl_OpenFileChannel(NULL, DEV_NULL, "w", 0);