PRT_NULL_FD
farg0 = PRT_NULL_FD;
fd = pr_fcntl(P, PRT_NULL_FD, F_DUPFD, (void *)farg0, NULL);
fd = pr_fcntl(P, PRT_NULL_FD, F_DUP2FD_CLOFORK, (void *)farg0, NULL);
if (pr_fstat(P, PRT_NULL_FD, &targ) != 0) {
VERIFY3S(fd, ==, PRT_NULL_FD);
if (!pr_target_check_fd("normal open", PRT_NULL_FD, PRT_NULL_OFLAG,