1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 1997 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1988 AT&T */ 28 /* All Rights Reserved */ 29 30 /* 31 * University Copyright- Copyright (c) 1982, 1986, 1988 32 * The Regents of the University of California 33 * All Rights Reserved 34 * 35 * University Acknowledgment- Portions of this document are derived from 36 * software developed by the University of California, Berkeley, and its 37 * contributors. 38 */ 39 40 #pragma ident "%Z%%M% %I% %E% SMI" 41 42 /*LINTLIBRARY*/ 43 44 #include "curses_inc.h" 45 #include <stdio.h> 46 #include <sys/types.h> 47 #include <poll.h> 48 49 /* 50 * napms. Sleep for ms milliseconds. We don't expect a particularly good 51 * resolution - 60ths of a second is normal, 10ths might even be good enough, 52 * but the rest of the program thinks in ms because the unit of resolution 53 * varies from system to system. (In some countries, it's 50ths, for example.) 54 * Vaxen running 4.2BSD and 3B's use 100ths. 55 * 56 * Here are some reasonable ways to get a good nap. 57 * 58 * (1) Use the poll() or select() system calls in SVr3 or Berkeley 4.2BSD. 59 * 60 * (2) Use the 1/10th second resolution wait in the System V tty driver. 61 * It turns out this is hard to do - you need a tty line that is 62 * always unused that you have read permission on to sleep on. 63 * 64 * (3) Install the ft (fast timer) device in your kernel. 65 * This is a psuedo-device to which an ioctl will wait n ticks 66 * and then send you an alarm. 67 * 68 * (4) Install the nap system call in your kernel. 69 * This system call does a timeout for the requested number of ticks. 70 * 71 * (5) Write a routine that busy waits checking the time with ftime. 72 * Ftime is not present on SYSV systems, and since this busy waits, 73 * it will drag down response on your system. But it works. 74 */ 75 76 int 77 napms(int ms) 78 { 79 struct pollfd pollfd; 80 81 if (poll(&pollfd, 0L, ms) == -1) 82 perror("poll"); 83 return (OK); 84 } 85