usr/src/cmd/fm/fmd/common/fmd_rtld.c

   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 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include <dlfcn.h>
  30 #include <link.h>
  31
  32 #include <fmd_module.h>
  33 #include <fmd_error.h>
  34 #include <fmd_alloc.h>
  35 #include <fmd_subr.h>
  36 #include <fmd_event.h>
  37 #include <fmd.h>
  38
  39 typedef struct fmd_rtld {
  40         void *rtld_dlp;         /* libdl(3DL) handle for shared library */
  41         void (*rtld_init)(fmd_hdl_t *); /* shared library's _fmd_init() */
  42         void (*rtld_fini)(fmd_hdl_t *); /* shared library's _fmd_fini() */
  43 } fmd_rtld_t;
  44
  45 static int
  46 rtld_init(fmd_module_t *mp)
  47 {
  48         fmd_rtld_t *rp;
  49         void *dlp;
  50
  51         if ((dlp = dlopen(mp->mod_path, RTLD_LOCAL | RTLD_NOW)) == NULL) {
  52                 fmd_error(EFMD_RTLD_OPEN, "%s\n", dlerror());
  53                 return (fmd_set_errno(EFMD_RTLD_OPEN));
  54         }
  55
  56         rp = mp->mod_data = fmd_alloc(sizeof (fmd_rtld_t), FMD_SLEEP);
  57
  58         rp->rtld_dlp = dlp;
  59         rp->rtld_init = (void (*)())dlsym(dlp, "_fmd_init");
  60         rp->rtld_fini = (void (*)())dlsym(dlp, "_fmd_fini");
  61
  62         if (rp->rtld_init == NULL) {
  63                 (void) dlclose(dlp);
  64                 fmd_free(rp, sizeof (fmd_rtld_t));
  65                 return (fmd_set_errno(EFMD_RTLD_INIT));
  66         }
  67
  68         (void) pthread_mutex_unlock(&mp->mod_lock);
  69
  70         /*
  71          * Call _fmd_init() in the module.  If this causes a module abort and
  72          * mod_info has been registered, unregister it on behalf of the module.
  73          */
  74         if (fmd_module_enter(mp, rp->rtld_init) != 0 && mp->mod_info != NULL)
  75                 fmd_hdl_unregister((fmd_hdl_t *)mp);
  76
  77         fmd_module_exit(mp);
  78         (void) pthread_mutex_lock(&mp->mod_lock);
  79
  80         if (mp->mod_info == NULL) {
  81                 (void) dlclose(dlp);
  82                 fmd_free(rp, sizeof (fmd_rtld_t));
  83                 return (fmd_set_errno(EFMD_HDL_INIT));
  84         }
  85
  86         return (0);
  87 }
  88
  89 static int
  90 rtld_fini(fmd_module_t *mp)
  91 {
  92         fmd_rtld_t *rp = mp->mod_data;
  93         int doclose = 1, err = 0;
  94
  95         if (mp->mod_info != NULL) {
  96                 (void) fmd_module_enter(mp, rp->rtld_fini);
  97
  98                 if (mp->mod_info != NULL) {
  99                         fmd_module_lock(mp);
 100                         fmd_module_unregister(mp);
 101                         fmd_module_unlock(mp);
 102                 }
 103
 104                 fmd_module_exit(mp);
 105         }
 106
 107         (void) fmd_conf_getprop(fmd.d_conf, "plugin.close", &doclose);
 108         if (doclose)
 109                 err = dlclose(rp->rtld_dlp);
 110
 111         fmd_free(rp, sizeof (fmd_rtld_t));
 112         return (err);
 113 }
 114
 115 const fmd_modops_t fmd_rtld_ops = {
 116         rtld_init,
 117         rtld_fini,
 118         fmd_module_dispatch,
 119         fmd_module_transport,
 120 };