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 2005 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 * 26 * This D script is used as an example in the Solaris Dynamic Tracing Guide 27 * wiki in the "Variables" Chapter. 28 * 29 * The full text of the this chapter may be found here: 30 * 31 * http://wikis.sun.com/display/DTrace/Variables 32 * 33 * On machines that have DTrace installed, this script is available as 34 * rtime.d in /usr/demo/dtrace, a directory that contains all D scripts 35 * used in the Solaris Dynamic Tracing Guide. A table of the scripts and their 36 * corresponding chapters may be found here: 37 * 38 * file:///usr/demo/dtrace/index.html 39 */ 40 41 syscall::read:entry 42 { 43 self->t = timestamp; 44 } 45 46 syscall::read:return 47 /self->t != 0/ 48 { 49 printf("%d/%d spent %d nsecs in read(2)\n", 50 pid, tid, timestamp - self->t); 51 52 /* 53 * We're done with this thread-local variable; assign zero to it to 54 * allow the DTrace runtime to reclaim the underlying storage. 55 */ 56 self->t = 0; 57 } 58