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 (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /*
28 * Copyright (c) 2012 by Delphix. All rights reserved.
29 */
30
31 /*
32 * This is the basis for drti.o which dt_link.c links into the object file
33 * generated by dtrace(8) -G by default (note that -xlazyload disables this).
34 */
35
36 #include <dlfcn.h>
37 #include <stdlib.h>
38 #include <fcntl.h>
39 #include <unistd.h>
40
41 #include <dlink.h>
42
43 static int gen; /* DOF helper generation */
44 extern dof_hdr_t __SUNW_dof; /* DOF defined in the .SUNW_dof section */
45
46 #pragma init(dtrace_drti_init)
47 static void
dtrace_drti_init(void)48 dtrace_drti_init(void)
49 {
50 Link_map *lmp;
51 Lmid_t lmid;
52
53 dtrace_link_init();
54
55 if (dlinfo(RTLD_SELF, RTLD_DI_LINKMAP, &lmp) == -1 || lmp == NULL) {
56 dprintf(1, "couldn't discover module name or address\n");
57 return;
58 }
59
60 if (dlinfo(RTLD_SELF, RTLD_DI_LMID, &lmid) == -1) {
61 dprintf(1, "couldn't discover link map ID\n");
62 return;
63 }
64
65 dtrace_link_dof(&__SUNW_dof, lmid, lmp->l_name, lmp->l_addr);
66 }
67
68 #pragma fini(dtrace_drti_fini)
69 static void
dtrace_drti_fini(void)70 dtrace_drti_fini(void)
71 {
72 int fd;
73
74 if ((fd = open64(devname, O_RDWR)) < 0) {
75 dprintf(1, "failed to open helper device %s", devname);
76 return;
77 }
78
79 if ((gen = ioctl(fd, DTRACEHIOC_REMOVE, gen)) == -1)
80 dprintf(1, "DTrace ioctl failed to remove DOF (%d)\n", gen);
81 else
82 dprintf(1, "DTrace ioctl removed DOF (%d)\n", gen);
83
84 (void) close(fd);
85 }
86