CDISCARD
{ "discard", VDISCARD, CDISCARD },
{ "flush", VDISCARD, CDISCARD },
CDISCARD, CLNEXT, CSTATUS, CPAGE,
CDISCARD, _POSIX_VDISABLE, _POSIX_VDISABLE, _POSIX_VDISABLE,
#if !defined(CDISCARD) && defined(CFLUSH)
# ifndef CDISCARD
# ifndef CDISCARD
[VDISCARD] = CDISCARD,
#define CFLUSH CDISCARD
#if defined(VDISCARD) && defined(CDISCARD)
mode.c_cc[VDISCARD] = CHK(mode.c_cc[VDISCARD], CDISCARD);