daemons/syseventd/sysevent_client.c

	sysevent_client.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * 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 (c) 2000-2001 by Sun Microsystems, Inc.
 * All rights reserved.
 */

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

/*
 * syseventd client interfaces
 */

#include <stdio.h>
#include <sys/types.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdlib.h>
#include <unistd.h>
#include <door.h>
#include <errno.h>
#include <strings.h>
#include <thread.h>
#include <pthread.h>
#include <synch.h>
#include <syslog.h>
#include <fcntl.h>
#include <stropts.h>
#include <locale.h>
#include <libsysevent.h>
#include <sys/stat.h>
#include <sys/sysevent.h>

#include "syseventd.h"
#include "message.h"

/*
 * sysevent_client.c - contains routines particular to syseventd client
 *          management (addition and deletion).
 */

/* Global client table and lock */
struct sysevent_client *sysevent_client_tbl[MAX_SLM];
mutex_t client_tbl_lock;

/*
 * initialize_client_tbl - Initialize each client entry in the syseventd
 *             client table.  Each entry in the client table
 *             entry represents one shared-object (SLM) client.
 */
void
initialize_client_tbl()
{
    struct sysevent_client  *scp;
    int             i;

    for (i = 0; i < MAX_SLM; ++i) {
        if ((scp = (struct sysevent_client *)malloc(
            sizeof (struct sysevent_client))) == NULL)
            goto init_error;

        if (mutex_init(&scp->client_lock, USYNC_THREAD, NULL) != 0)
            goto init_error;

        scp->client_data = NULL;
        scp->client_num = i;
        scp->eventq = NULL;

        /* Clear all flags when setting UNLOADED */
        scp->client_flags = SE_CLIENT_UNLOADED;

        sysevent_client_tbl[i] = scp;
    }

    return;

init_error:
    syseventd_err_print(INIT_CLIENT_TBL_ERR);
    syseventd_exit(1);
}

/*
 * insert_client - called when a new SLM is loaded with syseventd.  The
 *         client specific data is updated to reflect this addition
 */
int
insert_client(void *client_data, int client_type, int retry_limit)
{
    int i;
    struct sysevent_client  *scp;

    (void) mutex_lock(&client_tbl_lock);
    for (i = 0; i < MAX_SLM; ++i) {
        scp = sysevent_client_tbl[i];
        if (scp->client_data == NULL) {
            (void) mutex_lock(&scp->client_lock);
            scp->client_data = client_data;
            scp->client_type = client_type;
            scp->retry_limit = retry_limit;
            scp->client_flags |= SE_CLIENT_LOADED;
            (void) cond_init(&scp->client_cv, USYNC_THREAD,
                NULL);
            (void) mutex_unlock(&scp->client_lock);
            (void) mutex_unlock(&client_tbl_lock);
                return (i);
        }
    }

    (void) mutex_unlock(&client_tbl_lock);
    syseventd_print(1, "Unable to insert into syseventd client table\n");
    return (-1);
}

/*
 * delete_client - called to remove an SLM from the client table.  Client
 *         removal may occur when syseventd terminates, receives
 *         a SIGHUP or the client must be force unloaded due
 *         it's unresponsive nature.
 */
void
delete_client(int id)
{
    struct sysevent_client  *scp;

    scp = sysevent_client_tbl[id];

    free(scp->client_data);
    scp->client_data = NULL;

    /* Clear all flags when setting UNLOADED */
    scp->client_flags = SE_CLIENT_UNLOADED;
    (void) cond_destroy(&scp->client_cv);
    bzero(&scp->client_cv, sizeof (cond_t));
}