getdtablesize
int getdtablesize(void);
for (fd = 3; fd < getdtablesize(); ++fd)
if ((fds = getdtablesize()) <= 0)
for (fd = getdtablesize(); fd > STDERR_FILENO; fd--)
for (cnt = getdtablesize(); cnt > 2; cnt--)
for (cnt = getdtablesize(); cnt > 2; cnt--)
fd = getdtablesize();
int i, nfds = getdtablesize();
s = getdtablesize();
for (i = getdtablesize(); i > 2; i--)