84 static int uffd, uffd_flags, finished, *pipefd;  variable
454 	int ret = read(uffd, msg, sizeof(*msg));  in uffd_read_msg()
486 	return copy_page(uffd, offset);  in uffd_handle_page_fault()
499 	pollfd[0].fd = uffd;  in uffd_poll_thread()
519 		if (uffd_read_msg(uffd, &msg))  in uffd_poll_thread()
530 			close(uffd);  in uffd_poll_thread()
531 			uffd = msg.arg.fork.ufd;  in uffd_poll_thread()
532 			pollfd[0].fd = uffd;  in uffd_poll_thread()
538 			if (ioctl(uffd, UFFDIO_UNREGISTER, &uffd_reg.range))  in uffd_poll_thread()
563 		if (uffd_read_msg(uffd, &msg))  in uffd_read_thread()
578 		copy_page_retry(uffd, page_nr * page_size);  in background_thread()
657 	uffd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK);  in userfaultfd_open()
658 	if (uffd < 0) {  in userfaultfd_open()
663 	uffd_flags = fcntl(uffd, F_GETFD, NULL);  in userfaultfd_open()
667 	if (ioctl(uffd, UFFDIO_API, &uffdio_api)) {  in userfaultfd_open()
747 					if (copy_page(uffd, nr * page_size))  in faulting_process()
887 	if (ioctl(uffd, UFFDIO_REGISTER, &uffdio_register))  in userfaultfd_zeropage_test()
897 	if (uffdio_zeropage(uffd, 0)) {  in userfaultfd_zeropage_test()
902 	close(uffd);  in userfaultfd_zeropage_test()
927 	fcntl(uffd, F_SETFL, uffd_flags | O_NONBLOCK);  in userfaultfd_events_test()
932 	if (ioctl(uffd, UFFDIO_REGISTER, &uffdio_register))  in userfaultfd_events_test()
961 	close(uffd);  in userfaultfd_events_test()
986 	fcntl(uffd, F_SETFL, uffd_flags | O_NONBLOCK);  in userfaultfd_sig_test()
991 	if (ioctl(uffd, UFFDIO_REGISTER, &uffdio_register))  in userfaultfd_sig_test()
1030 	close(uffd);  in userfaultfd_sig_test()
1114 			fcntl(uffd, F_SETFL, uffd_flags | O_NONBLOCK);  in userfaultfd_stress()
1116 			fcntl(uffd, F_SETFL, uffd_flags & ~O_NONBLOCK);  in userfaultfd_stress()
1122 		if (ioctl(uffd, UFFDIO_REGISTER, &uffdio_register)) {  in userfaultfd_stress()
1137 			if (ioctl(uffd, UFFDIO_REGISTER, &uffdio_register)) {  in userfaultfd_stress()
1175 		if (ioctl(uffd, UFFDIO_UNREGISTER, &uffdio_register.range)) {  in userfaultfd_stress()
1181 			if (ioctl(uffd, UFFDIO_UNREGISTER,  in userfaultfd_stress()
1221 	close(uffd);  in userfaultfd_stress()