FD_STDOUT
case FD_STDOUT:
ix = FD_STDOUT;
{ FD_STDOUT, DT_LNK, N("stdout") },
case FD_STDOUT:
#if (FD_STDIN != FD_STDOUT-1) || (FD_STDOUT != FD_STDERR-1)
FD_STDIN, FD_STDOUT, FD_STDERR must be a sequence n, n+1, n+2