F_DUP2FD
cmd = F_DUP2FD;
case F_DUP2FD:
#ifdef F_DUP2FD
{ BSM_F_DUP2FD, F_DUP2FD },
EXPECT_OK(fcntl(caps[0], F_DUP2FD, newfd));
if ((fd2 = fcntl(fd1, F_DUP2FD, fd1 + 1)) < 0)
if ((fd2 = fcntl(fd1, F_DUP2FD, fd1)) < 0)
if ((fd2 = fcntl(fd1, F_DUP2FD, rlp.rlim_cur + 1)) >= 0)