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 #include <dlfcn.h>
28 #include <link.h>
29
30 #include <fmd_module.h>
31 #include <fmd_error.h>
32 #include <fmd_alloc.h>
33 #include <fmd_subr.h>
34 #include <fmd_event.h>
35 #include <fmd.h>
36
37 typedef struct fmd_rtld {
38 void *rtld_dlp; /* libdl(3DL) handle for shared library */
39 void (*rtld_init)(fmd_hdl_t *); /* shared library's _fmd_init() */
40 void (*rtld_fini)(fmd_hdl_t *); /* shared library's _fmd_fini() */
41 } fmd_rtld_t;
42
43 static int
rtld_init(fmd_module_t * mp)44 rtld_init(fmd_module_t *mp)
45 {
46 fmd_rtld_t *rp;
47 void *dlp;
48
49 if ((dlp = dlopen(mp->mod_path, RTLD_LOCAL | RTLD_NOW)) == NULL) {
50 fmd_error(EFMD_RTLD_OPEN, "%s\n", dlerror());
51 return (fmd_set_errno(EFMD_RTLD_OPEN));
52 }
53
54 rp = mp->mod_data = fmd_alloc(sizeof (fmd_rtld_t), FMD_SLEEP);
55
56 rp->rtld_dlp = dlp;
57 rp->rtld_init = (void (*)())dlsym(dlp, "_fmd_init");
58 rp->rtld_fini = (void (*)())dlsym(dlp, "_fmd_fini");
59
60 if (rp->rtld_init == NULL) {
61 (void) dlclose(dlp);
62 fmd_free(rp, sizeof (fmd_rtld_t));
63 return (fmd_set_errno(EFMD_RTLD_INIT));
64 }
65
66 (void) pthread_mutex_unlock(&mp->mod_lock);
67
68 /*
69 * Call _fmd_init() in the module. If this causes a module abort and
70 * mod_info has been registered, unregister it on behalf of the module.
71 */
72 if (fmd_module_enter(mp, rp->rtld_init) != 0 && mp->mod_info != NULL)
73 fmd_hdl_unregister((fmd_hdl_t *)mp);
74
75 fmd_module_exit(mp);
76 (void) pthread_mutex_lock(&mp->mod_lock);
77
78 if (mp->mod_info == NULL) {
79 (void) dlclose(dlp);
80 fmd_free(rp, sizeof (fmd_rtld_t));
81 return (fmd_set_errno(EFMD_HDL_INIT));
82 }
83
84 return (0);
85 }
86
87 static int
rtld_fini(fmd_module_t * mp)88 rtld_fini(fmd_module_t *mp)
89 {
90 fmd_rtld_t *rp = mp->mod_data;
91 int doclose = 1, err = 0;
92
93 if (mp->mod_info != NULL) {
94 (void) fmd_module_enter(mp, rp->rtld_fini);
95
96 if (mp->mod_info != NULL) {
97 fmd_module_lock(mp);
98 fmd_module_unregister(mp);
99 fmd_module_unlock(mp);
100 }
101
102 fmd_module_exit(mp);
103 }
104
105 (void) fmd_conf_getprop(fmd.d_conf, "plugin.close", &doclose);
106 if (doclose)
107 err = dlclose(rp->rtld_dlp);
108
109 fmd_free(rp, sizeof (fmd_rtld_t));
110 return (err);
111 }
112
113 const fmd_modops_t fmd_rtld_ops = {
114 rtld_init,
115 rtld_fini,
116 fmd_module_dispatch,
117 fmd_module_transport,
118 };
119