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 27 #!/usr/sbin/dtrace -Fs 28 29 syscall::open:entry, 30 syscall::open64:entry 31 { 32 /* 33 * The call to speculation() creates a new speculation. If this fails, 34 * dtrace(8) will generate an error message indicating the reason for 35 * the failed speculation(), but subsequent speculative tracing will be 36 * silently discarded. 37 */ 38 self->spec = speculation(); 39 speculate(self->spec); 40 41 /* 42 * Because this printf() follows the speculate(), it is being 43 * speculatively traced; it will only appear in the data buffer if the 44 * speculation is subsequently commited. 45 */ 46 printf("%s", stringof(copyinstr(arg0))); 47 } 48 49 fbt::: 50 /self->spec/ 51 { 52 /* 53 * A speculate() with no other actions speculates the default action: 54 * tracing the EPID. 55 */ 56 speculate(self->spec); 57 } 58 59 syscall::open:return, 60 syscall::open64:return 61 /self->spec/ 62 { 63 /* 64 * To balance the output with the -F option, we want to be sure that 65 * every entry has a matching return. Because we speculated the 66 * open entry above, we want to also speculate the open return. 67 * This is also a convenient time to trace the errno value. 68 */ 69 speculate(self->spec); 70 trace(errno); 71 } 72 73 syscall::open:return, 74 syscall::open64:return 75 /self->spec && errno != 0/ 76 { 77 /* 78 * If errno is non-zero, we want to commit the speculation. 79 */ 80 commit(self->spec); 81 self->spec = 0; 82 } 83 84 syscall::open:return, 85 syscall::open64:return 86 /self->spec && errno == 0/ 87 { 88 /* 89 * If errno is not set, we discard the speculation. 90 */ 91 discard(self->spec); 92 self->spec = 0; 93 } 94