fmd/common/fmd_rtld.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <dlfcn.h>
#include <link.h>

#include <fmd_module.h>
#include <fmd_error.h>
#include <fmd_alloc.h>
#include <fmd_subr.h>
#include <fmd_event.h>
#include <fmd.h>

typedef struct fmd_rtld {
    void *rtld_dlp;     /* libdl(3DL) handle for shared library */
    void (*rtld_init)(fmd_hdl_t *); /* shared library's _fmd_init() */
    void (*rtld_fini)(fmd_hdl_t *); /* shared library's _fmd_fini() */
} fmd_rtld_t;

static int
rtld_init(fmd_module_t *mp)
{
    fmd_rtld_t *rp;
    void *dlp;

    if ((dlp = dlopen(mp->mod_path, RTLD_LOCAL | RTLD_NOW)) == NULL) {
        fmd_error(EFMD_RTLD_OPEN, "%s\n", dlerror());
        return (fmd_set_errno(EFMD_RTLD_OPEN));
    }

    rp = mp->mod_data = fmd_alloc(sizeof (fmd_rtld_t), FMD_SLEEP);

    rp->rtld_dlp = dlp;
    rp->rtld_init = (void (*)())dlsym(dlp, "_fmd_init");
    rp->rtld_fini = (void (*)())dlsym(dlp, "_fmd_fini");

    if (rp->rtld_init == NULL) {
        (void) dlclose(dlp);
        fmd_free(rp, sizeof (fmd_rtld_t));
        return (fmd_set_errno(EFMD_RTLD_INIT));
    }

    (void) pthread_mutex_unlock(&mp->mod_lock);

    /*
     * Call _fmd_init() in the module.  If this causes a module abort and
     * mod_info has been registered, unregister it on behalf of the module.
     */
    if (fmd_module_enter(mp, rp->rtld_init) != 0 && mp->mod_info != NULL)
        fmd_hdl_unregister((fmd_hdl_t *)mp);

    fmd_module_exit(mp);
    (void) pthread_mutex_lock(&mp->mod_lock);

    if (mp->mod_info == NULL) {
        (void) dlclose(dlp);
        fmd_free(rp, sizeof (fmd_rtld_t));
        return (fmd_set_errno(EFMD_HDL_INIT));
    }

    return (0);
}

static int
rtld_fini(fmd_module_t *mp)
{
    fmd_rtld_t *rp = mp->mod_data;
    int doclose = 1, err = 0;

    if (mp->mod_info != NULL) {
        (void) fmd_module_enter(mp, rp->rtld_fini);

        if (mp->mod_info != NULL) {
            fmd_module_lock(mp);
            fmd_module_unregister(mp);
            fmd_module_unlock(mp);
        }

        fmd_module_exit(mp);
    }

    (void) fmd_conf_getprop(fmd.d_conf, "plugin.close", &doclose);
    if (doclose)
        err = dlclose(rp->rtld_dlp);

    fmd_free(rp, sizeof (fmd_rtld_t));
    return (err);
}

const fmd_modops_t fmd_rtld_ops = {
    rtld_init,
    rtld_fini,
    fmd_module_dispatch,
    fmd_module_transport,
};