1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * CDDL HEADER START 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*0Sstevel@tonic-gate * with the License. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*0Sstevel@tonic-gate * See the License for the specific language governing permissions 12*0Sstevel@tonic-gate * and limitations under the License. 13*0Sstevel@tonic-gate * 14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * CDDL HEADER END 21*0Sstevel@tonic-gate */ 22*0Sstevel@tonic-gate /* 23*0Sstevel@tonic-gate * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24*0Sstevel@tonic-gate * Use is subject to license terms. 25*0Sstevel@tonic-gate */ 26*0Sstevel@tonic-gate 27*0Sstevel@tonic-gate #!/usr/sbin/dtrace -Fs 28*0Sstevel@tonic-gate 29*0Sstevel@tonic-gate syscall::open:entry, 30*0Sstevel@tonic-gate syscall::open64:entry 31*0Sstevel@tonic-gate { 32*0Sstevel@tonic-gate /* 33*0Sstevel@tonic-gate * The call to speculation() creates a new speculation. If this fails, 34*0Sstevel@tonic-gate * dtrace(1M) will generate an error message indicating the reason for 35*0Sstevel@tonic-gate * the failed speculation(), but subsequent speculative tracing will be 36*0Sstevel@tonic-gate * silently discarded. 37*0Sstevel@tonic-gate */ 38*0Sstevel@tonic-gate self->spec = speculation(); 39*0Sstevel@tonic-gate speculate(self->spec); 40*0Sstevel@tonic-gate 41*0Sstevel@tonic-gate /* 42*0Sstevel@tonic-gate * Because this printf() follows the speculate(), it is being 43*0Sstevel@tonic-gate * speculatively traced; it will only appear in the data buffer if the 44*0Sstevel@tonic-gate * speculation is subsequently commited. 45*0Sstevel@tonic-gate */ 46*0Sstevel@tonic-gate printf("%s", stringof(copyinstr(arg0))); 47*0Sstevel@tonic-gate } 48*0Sstevel@tonic-gate 49*0Sstevel@tonic-gate fbt::: 50*0Sstevel@tonic-gate /self->spec/ 51*0Sstevel@tonic-gate { 52*0Sstevel@tonic-gate /* 53*0Sstevel@tonic-gate * A speculate() with no other actions speculates the default action: 54*0Sstevel@tonic-gate * tracing the EPID. 55*0Sstevel@tonic-gate */ 56*0Sstevel@tonic-gate speculate(self->spec); 57*0Sstevel@tonic-gate } 58*0Sstevel@tonic-gate 59*0Sstevel@tonic-gate syscall::open:return, 60*0Sstevel@tonic-gate syscall::open64:return 61*0Sstevel@tonic-gate /self->spec/ 62*0Sstevel@tonic-gate { 63*0Sstevel@tonic-gate /* 64*0Sstevel@tonic-gate * To balance the output with the -F option, we want to be sure that 65*0Sstevel@tonic-gate * every entry has a matching return. Because we speculated the 66*0Sstevel@tonic-gate * open entry above, we want to also speculate the open return. 67*0Sstevel@tonic-gate * This is also a convenient time to trace the errno value. 68*0Sstevel@tonic-gate */ 69*0Sstevel@tonic-gate speculate(self->spec); 70*0Sstevel@tonic-gate trace(errno); 71*0Sstevel@tonic-gate } 72*0Sstevel@tonic-gate 73*0Sstevel@tonic-gate syscall::open:return, 74*0Sstevel@tonic-gate syscall::open64:return 75*0Sstevel@tonic-gate /self->spec && errno != 0/ 76*0Sstevel@tonic-gate { 77*0Sstevel@tonic-gate /* 78*0Sstevel@tonic-gate * If errno is non-zero, we want to commit the speculation. 79*0Sstevel@tonic-gate */ 80*0Sstevel@tonic-gate commit(self->spec); 81*0Sstevel@tonic-gate self->spec = 0; 82*0Sstevel@tonic-gate } 83*0Sstevel@tonic-gate 84*0Sstevel@tonic-gate syscall::open:return, 85*0Sstevel@tonic-gate syscall::open64:return 86*0Sstevel@tonic-gate /self->spec && errno == 0/ 87*0Sstevel@tonic-gate { 88*0Sstevel@tonic-gate /* 89*0Sstevel@tonic-gate * If errno is not set, we discard the speculation. 90*0Sstevel@tonic-gate */ 91*0Sstevel@tonic-gate discard(self->spec); 92*0Sstevel@tonic-gate self->spec = 0; 93*0Sstevel@tonic-gate } 94