98 static int uffd, uffd_flags, finished, *pipefd;  variable
453 	pollfd[0].fd = uffd;  in uffd_poll_thread()
473 		ret = read(uffd, &msg, sizeof(msg));  in uffd_poll_thread()
490 			if (copy_page(uffd, offset))  in uffd_poll_thread()
494 			close(uffd);  in uffd_poll_thread()
495 			uffd = msg.arg.fork.ufd;  in uffd_poll_thread()
496 			pollfd[0].fd = uffd;  in uffd_poll_thread()
502 			if (ioctl(uffd, UFFDIO_UNREGISTER, &uffd_reg.range))  in uffd_poll_thread()
529 		ret = read(uffd, &msg, sizeof(msg));  in uffd_read_thread()
545 		if (copy_page(uffd, offset))  in uffd_read_thread()
559 		copy_page_retry(uffd, page_nr * page_size);  in background_thread()
637 	uffd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK);  in userfaultfd_open()
638 	if (uffd < 0) {  in userfaultfd_open()
643 	uffd_flags = fcntl(uffd, F_GETFD, NULL);  in userfaultfd_open()
647 	if (ioctl(uffd, UFFDIO_API, &uffdio_api)) {  in userfaultfd_open()
727 					if (copy_page(uffd, nr * page_size))  in faulting_process()
867 	if (ioctl(uffd, UFFDIO_REGISTER, &uffdio_register))  in userfaultfd_zeropage_test()
877 	if (uffdio_zeropage(uffd, 0)) {  in userfaultfd_zeropage_test()
882 	close(uffd);  in userfaultfd_zeropage_test()
907 	fcntl(uffd, F_SETFL, uffd_flags | O_NONBLOCK);  in userfaultfd_events_test()
912 	if (ioctl(uffd, UFFDIO_REGISTER, &uffdio_register))  in userfaultfd_events_test()
941 	close(uffd);  in userfaultfd_events_test()
966 	fcntl(uffd, F_SETFL, uffd_flags | O_NONBLOCK);  in userfaultfd_sig_test()
971 	if (ioctl(uffd, UFFDIO_REGISTER, &uffdio_register))  in userfaultfd_sig_test()
1010 	close(uffd);  in userfaultfd_sig_test()
1094 			fcntl(uffd, F_SETFL, uffd_flags | O_NONBLOCK);  in userfaultfd_stress()
1096 			fcntl(uffd, F_SETFL, uffd_flags & ~O_NONBLOCK);  in userfaultfd_stress()
1102 		if (ioctl(uffd, UFFDIO_REGISTER, &uffdio_register)) {  in userfaultfd_stress()
1117 			if (ioctl(uffd, UFFDIO_REGISTER, &uffdio_register)) {  in userfaultfd_stress()
1155 		if (ioctl(uffd, UFFDIO_UNREGISTER, &uffdio_register.range)) {  in userfaultfd_stress()
1161 			if (ioctl(uffd, UFFDIO_UNREGISTER,  in userfaultfd_stress()
1201 	close(uffd);  in userfaultfd_stress()