/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (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 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <fm/fmd_adm.h>
#include <fm/fmd_snmp.h>
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>
#include <pthread.h>
#include <stddef.h>
#include <errno.h>
#include <libuutil.h>
#include "sunFM_impl.h"
#include "module.h"

static uu_avl_pool_t    *mod_name_avl_pool;
static uu_avl_pool_t    *mod_index_avl_pool;
static uu_avl_t         *mod_name_avl;
static uu_avl_t         *mod_index_avl;

#define VALID_AVL_STATE (mod_name_avl_pool != NULL &&           \
        mod_index_avl_pool != NULL && mod_name_avl != NULL &&   \
        mod_index_avl != NULL)

#define UPDATE_WAIT_MILLIS      10      /* poll interval in milliseconds */

/*
 * Update types.  Single-index and all are mutually exclusive.
 */
#define UCT_INDEX       0x1
#define UCT_ALL         0x2
#define UCT_FLAGS       0x3

#define MODULE_DATA_VALID(d)    ((d)->d_valid == valid_stamp)

/*
 * Locking rules are straightforward.  There is only one updater thread
 * for each table, and requests for update that are received while
 * another update is in progress are ignored.  The single per-table lock
 * protects all the data for the table, the valid_stamp and max_index
 * tags for new data, and - importantly - all the hidden static data
 * used by the Net-SNMP library.  The result return callbacks are always
 * called in the master agent thread; holding the table lock is
 * therefore sufficient since only one table's callback can be run at
 * any one time.  Finer-grained locking is possible here but
 * substantially more difficult because nearly all Net-SNMP functions
 * are unsafe.
 *
 * In practice this is more than adequate, since the purpose of
 * threading out the update is to prevent excessively time-consuming
 * data collection from bottlenecking the entire agent, not to improve
 * result throughput (SNMP is not intended to be used for applications
 * requiring high throughput anyway).  If the agent itself ever becomes
 * multithreaded, locking requirements become limited to our local
 * per-table data (the tree, max_index, and valid_stamp), and the
 * implementation could be revisited for better performance.
 */

static ulong_t          max_index;
static int              valid_stamp;
static pthread_mutex_t  update_lock;
static pthread_cond_t   update_cv;
static volatile enum { US_QUIET, US_NEEDED, US_INPROGRESS } update_status;

static Netsnmp_Node_Handler     sunFmModuleTable_handler;

static sunFmModule_data_t *
key_build(const char *name, const ulong_t index)
{
        static sunFmModule_data_t       key;

        key.d_index = index;
        if (name)
                (void) strlcpy(key.d_ami_name, name, sizeof (key.d_ami_name));
        else
                key.d_ami_name[0] = '\0';

        return (&key);
}

/*
 * If name is the name of a module we have previously seen and indexed, return
 * data for it.  Otherwise, return NULL.  Note that the module may not be
 * valid; that is, it may have been removed from the fault manager since its
 * information was last updated.
 */
static sunFmModule_data_t *
module_lookup_name(const char *name)
{
        sunFmModule_data_t      *key;

        key = key_build(name, 0);
        return (uu_avl_find(mod_name_avl, key, NULL, NULL));
}

/*
 * If index corresponds to a module we have previously seen and indexed, return
 * data for it.  Otherwise, return NULL.  Note that the module may not be
 * valid; that is, it may have been removed from the fault manager since its
 * information was last updated.
 */
static sunFmModule_data_t *
module_lookup_index_exact(const ulong_t index)
{
        sunFmModule_data_t      *key;

        key = key_build(NULL, index);
        return (uu_avl_find(mod_index_avl, key, NULL, NULL));
}

/*
 * If index corresponds to a valid (that is, extant as of latest information
 * from the fault manager) fmd module, return the data for that module.
 * Otherwise, return the data for the valid module whose index is as close as
 * possible to index but not lower.  This preserves the lexicographical
 * ordering required for GETNEXT processing.
 */
static sunFmModule_data_t *
module_lookup_index_nextvalid(const ulong_t index)
{
        sunFmModule_data_t      *key, *data;
        uu_avl_index_t          idx;

        key = key_build(NULL, index);

        if ((data = uu_avl_find(mod_index_avl, key, NULL, &idx)) != NULL &&
            MODULE_DATA_VALID(data))
                return (data);

        data = uu_avl_nearest_next(mod_index_avl, idx);

        while (data != NULL && !MODULE_DATA_VALID(data))
                data = uu_avl_next(mod_index_avl, data);

        return (data);
}

/*
 * Possible update the contents of a single module within the cache.  This
 * is our callback from fmd_module_iter.
 */
static int
modinfo_update_one(const fmd_adm_modinfo_t *modinfo, void *arg)
{
        const sunFmModule_update_ctx_t *update_ctx =
            (sunFmModule_update_ctx_t *)arg;
        sunFmModule_data_t *data = module_lookup_name(modinfo->ami_name);

        /*
         * An fmd module we haven't seen before.  We're obligated to index
         * it and link it into our cache so that we can find it, but we're
         * not obligated to fill it in completely unless we're doing a
         * thorough update or this is the module we were asked for.  This
         * avoids unnecessary iteration and memory manipulation for data
         * we're not going to return for this request.
         */
        if (data == NULL) {
                uu_avl_index_t idx;

                DEBUGMSGTL((MODNAME_STR, "found new fmd module %s\n",
                    modinfo->ami_name));
                if ((data = SNMP_MALLOC_TYPEDEF(sunFmModule_data_t)) == NULL) {
                        (void) snmp_log(LOG_ERR, MODNAME_STR ": Out of memory "
                            "for new module data at %s:%d\n", __FILE__,
                            __LINE__);
                        return (1);
                }
                /*
                 * We allocate indices sequentially and never reuse them.
                 * This ensures we can always return valid GETNEXT responses
                 * without having to reindex, and it provides the user a
                 * more consistent view of the fault manager.
                 */
                data->d_index = ++max_index;
                DEBUGMSGTL((MODNAME_STR, "index %lu is %s@%p\n", data->d_index,
                    modinfo->ami_name, data));

                (void) strlcpy(data->d_ami_name, modinfo->ami_name,
                    sizeof (data->d_ami_name));

                uu_avl_node_init(data, &data->d_name_avl, mod_name_avl_pool);
                (void) uu_avl_find(mod_name_avl, data, NULL, &idx);
                uu_avl_insert(mod_name_avl, data, idx);

                uu_avl_node_init(data, &data->d_index_avl, mod_index_avl_pool);
                (void) uu_avl_find(mod_index_avl, data, NULL, &idx);
                uu_avl_insert(mod_index_avl, data, idx);

                DEBUGMSGTL((MODNAME_STR, "completed new module %lu/%s@%p\n",
                    data->d_index, data->d_ami_name, data));
        }

        data->d_valid = valid_stamp;

        DEBUGMSGTL((MODNAME_STR, "timestamp updated for %lu/%s@%p: %d\n",
            data->d_index, data->d_ami_name, data, data->d_valid));

        if ((update_ctx->uc_type & UCT_ALL) ||
            update_ctx->uc_index == data->d_index) {
                (void) strlcpy(data->d_ami_vers, modinfo->ami_vers,
                    sizeof (data->d_ami_vers));
                (void) strlcpy(data->d_ami_desc, modinfo->ami_desc,
                    sizeof (data->d_ami_desc));
                data->d_ami_flags = modinfo->ami_flags;
        }

        return (!(update_ctx->uc_type & UCT_ALL) &&
            update_ctx->uc_index == data->d_index);
}

/*
 * Update some or all module data from fmd.  If thorough is set, all modules
 * will be indexed and their data cached.  Otherwise, updates will stop once
 * the module matching index has been updated.
 *
 * Returns appropriate SNMP error codes.
 */
static int
modinfo_update(sunFmModule_update_ctx_t *update_ctx)
{
        fmd_adm_t *adm;

        ASSERT(update_ctx != NULL);
        ASSERT((update_ctx->uc_type & (UCT_INDEX|UCT_ALL)) !=
            (UCT_INDEX|UCT_ALL));
        ASSERT((update_ctx->uc_type & ~UCT_FLAGS) == 0);
        ASSERT(VALID_AVL_STATE);

        if ((adm = fmd_adm_open(update_ctx->uc_host, update_ctx->uc_prog,
            update_ctx->uc_version)) == NULL) {
                (void) snmp_log(LOG_ERR, MODNAME_STR ": Communication with fmd "
                    "failed: %s\n", strerror(errno));
                return (SNMP_ERR_RESOURCEUNAVAILABLE);
        }

        ++valid_stamp;
        if (fmd_adm_module_iter(adm, modinfo_update_one, update_ctx) != 0) {
                (void) snmp_log(LOG_ERR, MODNAME_STR ": fmd module information "
                    "update failed: %s\n", fmd_adm_errmsg(adm));
                fmd_adm_close(adm);
                return (SNMP_ERR_RESOURCEUNAVAILABLE);
        }

        DEBUGMSGTL((MODNAME_STR, "module iteration completed\n"));

        fmd_adm_close(adm);
        return (SNMP_ERR_NOERROR);
}

__NORETURN static void *
update_thread(void *arg __unused)
{
        /*
         * The current modinfo_update implementation offers minimal savings
         * for the use of index-only updates; therefore we always do a full
         * update.  If it becomes advantageous to limit updates to a single
         * index, the contexts can be queued by the handler instead.
         */
        sunFmModule_update_ctx_t        uc;

        uc.uc_host = NULL;
        uc.uc_prog = FMD_ADM_PROGRAM;
        uc.uc_version = FMD_ADM_VERSION;

        uc.uc_index = 0;
        uc.uc_type = UCT_ALL;

        for (;;) {
                (void) pthread_mutex_lock(&update_lock);
                update_status = US_QUIET;
                while (update_status == US_QUIET)
                        (void) pthread_cond_wait(&update_cv, &update_lock);
                update_status = US_INPROGRESS;
                (void) pthread_mutex_unlock(&update_lock);
                (void) modinfo_update(&uc);
        }
}

static void
request_update(void)
{
        (void) pthread_mutex_lock(&update_lock);
        if (update_status != US_QUIET) {
                (void) pthread_mutex_unlock(&update_lock);
                return;
        }
        update_status = US_NEEDED;
        (void) pthread_cond_signal(&update_cv);
        (void) pthread_mutex_unlock(&update_lock);
}

/*ARGSUSED*/
static int
module_compare_name(const void *l, const void *r, void *private)
{
        sunFmModule_data_t      *l_data = (sunFmModule_data_t *)l;
        sunFmModule_data_t      *r_data = (sunFmModule_data_t *)r;

        ASSERT(l_data != NULL && r_data != NULL);

        return (strcmp(l_data->d_ami_name, r_data->d_ami_name));
}

/*ARGSUSED*/
static int
module_compare_index(const void *l, const void *r, void *private)
{
        sunFmModule_data_t      *l_data = (sunFmModule_data_t *)l;
        sunFmModule_data_t      *r_data = (sunFmModule_data_t *)r;

        ASSERT(l_data != NULL && r_data != NULL);

        return (l_data->d_index < r_data->d_index ? -1 :
            l_data->d_index > r_data->d_index ? 1 : 0);
}

int
sunFmModuleTable_init(void)
{
        static oid sunFmModuleTable_oid[] = { SUNFMMODULETABLE_OID };
        netsnmp_table_registration_info *table_info;
        netsnmp_handler_registration *handler;
        int err;

        if ((err = pthread_mutex_init(&update_lock, NULL)) != 0) {
                (void) snmp_log(LOG_ERR, MODNAME_STR ": mutex_init failure: "
                    "%s\n", strerror(err));
                return (MIB_REGISTRATION_FAILED);
        }
        if ((err = pthread_cond_init(&update_cv, NULL)) != 0) {
                (void) snmp_log(LOG_ERR, MODNAME_STR ": cond_init failure: "
                    "%s\n", strerror(err));
                return (MIB_REGISTRATION_FAILED);
        }

        if ((err = pthread_create(NULL, NULL, update_thread, NULL)) != 0) {
                (void) snmp_log(LOG_ERR, MODNAME_STR ": error creating update "
                    "thread: %s\n", strerror(err));
                return (MIB_REGISTRATION_FAILED);
        }

        if ((table_info =
            SNMP_MALLOC_TYPEDEF(netsnmp_table_registration_info)) == NULL)
                return (MIB_REGISTRATION_FAILED);

        if ((handler = netsnmp_create_handler_registration("sunFmModuleTable",
            sunFmModuleTable_handler, sunFmModuleTable_oid,
            OID_LENGTH(sunFmModuleTable_oid), HANDLER_CAN_RONLY)) == NULL) {
                SNMP_FREE(table_info);
                return (MIB_REGISTRATION_FAILED);
        }

        /*
         * The Net-SNMP template uses add_indexes here, but that
         * function is unsafe because it does not check for failure.
         */
        if (netsnmp_table_helper_add_index(table_info, ASN_UNSIGNED) == NULL) {
                SNMP_FREE(table_info);
                SNMP_FREE(handler);
                return (MIB_REGISTRATION_FAILED);
        }

        table_info->min_column = SUNFMMODULE_COLMIN;
        table_info->max_column = SUNFMMODULE_COLMAX;

        if ((mod_name_avl_pool = uu_avl_pool_create("mod_name",
            sizeof (sunFmModule_data_t),
            offsetof(sunFmModule_data_t, d_name_avl), module_compare_name,
            UU_AVL_DEBUG)) == NULL) {
                snmp_free_varbind(table_info->indexes);
                SNMP_FREE(table_info);
                SNMP_FREE(handler);
                return (MIB_REGISTRATION_FAILED);
        }

        if ((mod_name_avl = uu_avl_create(mod_name_avl_pool, NULL,
            UU_AVL_DEBUG)) == NULL) {
                (void) snmp_log(LOG_ERR, MODNAME_STR ": mod_name_avl creation "
                    "failed: %s\n", uu_strerror(uu_error()));
                snmp_free_varbind(table_info->indexes);
                SNMP_FREE(table_info);
                SNMP_FREE(handler);
                uu_avl_pool_destroy(mod_name_avl_pool);
                return (MIB_REGISTRATION_FAILED);
        }

        if ((mod_index_avl_pool = uu_avl_pool_create("mod_index",
            sizeof (sunFmModule_data_t),
            offsetof(sunFmModule_data_t, d_index_avl),
            module_compare_index, UU_AVL_DEBUG)) == NULL) {
                snmp_free_varbind(table_info->indexes);
                SNMP_FREE(table_info);
                SNMP_FREE(handler);
                uu_avl_destroy(mod_name_avl);
                uu_avl_pool_destroy(mod_name_avl_pool);
                return (MIB_REGISTRATION_FAILED);
        }

        if ((mod_index_avl = uu_avl_create(mod_index_avl_pool, NULL,
            UU_AVL_DEBUG)) == NULL) {
                (void) snmp_log(LOG_ERR, MODNAME_STR ": mod_index_avl creation "
                    "failed: %s\n", uu_strerror(uu_error()));
                snmp_free_varbind(table_info->indexes);
                SNMP_FREE(table_info);
                SNMP_FREE(handler);
                uu_avl_destroy(mod_name_avl);
                uu_avl_pool_destroy(mod_name_avl_pool);
                uu_avl_pool_destroy(mod_index_avl_pool);
                return (MIB_REGISTRATION_FAILED);
        }

        if ((err = netsnmp_register_table(handler, table_info)) !=
            MIB_REGISTERED_OK) {
                snmp_free_varbind(table_info->indexes);
                SNMP_FREE(table_info);
                SNMP_FREE(handler);
                uu_avl_destroy(mod_name_avl);
                uu_avl_pool_destroy(mod_name_avl_pool);
                uu_avl_destroy(mod_index_avl);
                uu_avl_pool_destroy(mod_index_avl_pool);
                return (err);
        }

        return (MIB_REGISTERED_OK);
}

/*
 * These two functions form the core of GET/GETNEXT/GETBULK handling (the
 * only kind we do).  They perform two functions:
 *
 * - First, frob the request to set all the index variables to correspond
 *   to the value that's going to be returned.  For GET, this is a nop;
 *   for GETNEXT/GETBULK it always requires some work.
 * - Second, find and return the fmd module information corresponding to
 *   the (possibly updated) indices.
 *
 * These should be as fast as possible; they run in the agent thread.
 */
static sunFmModule_data_t *
sunFmModuleTable_nextmod(netsnmp_handler_registration *reginfo,
    netsnmp_table_request_info *table_info)
{
        sunFmModule_data_t      *data;
        netsnmp_variable_list   *var;
        ulong_t index;

        /*
         * If we have no index, we must make one.
         */
        if (table_info->number_indexes < 1) {
                oid tmpoid[MAX_OID_LEN];
                index = 1;

                DEBUGMSGTL((MODNAME_STR, "nextmod: no indexes given\n"));
                var = SNMP_MALLOC_TYPEDEF(netsnmp_variable_list);
                (void) snmp_set_var_typed_value(var, ASN_UNSIGNED,
                    (uchar_t *)&index, sizeof (index));
                (void) memcpy(tmpoid, reginfo->rootoid,
                    reginfo->rootoid_len * sizeof (oid));
                tmpoid[reginfo->rootoid_len] = 1;       /* Entry is .1 */
                tmpoid[reginfo->rootoid_len + 1] = table_info->colnum;
                if (build_oid(&var->name, &var->name_length, tmpoid,
                    reginfo->rootoid_len + 2, var) != SNMPERR_SUCCESS) {
                        snmp_free_varbind(var);
                        return (NULL);
                }
                DEBUGMSGTL((MODNAME_STR, "nextmod: built fake index:\n"));
                DEBUGMSGVAR((MODNAME_STR, var));
                DEBUGMSG((MODNAME_STR, "\n"));
        } else {
                var = snmp_clone_varbind(table_info->indexes);
                index = *var->val.integer;
                DEBUGMSGTL((MODNAME_STR, "nextmod: received index:\n"));
                DEBUGMSGVAR((MODNAME_STR, var));
                DEBUGMSG((MODNAME_STR, "\n"));
                index++;
        }

        snmp_free_varbind(table_info->indexes);
        table_info->indexes = NULL;
        table_info->number_indexes = 0;

        if ((data = module_lookup_index_nextvalid(index)) == NULL) {
                DEBUGMSGTL((MODNAME_STR, "nextmod: exact match not found for "
                    "index %lu; trying next column\n", index));
                if (table_info->colnum >=
                    netsnmp_find_table_registration_info(reginfo)->max_column) {
                        snmp_free_varbind(var);
                        DEBUGMSGTL((MODNAME_STR, "nextmod: out of columns\n"));
                        return (NULL);
                }
                table_info->colnum++;
                index = 1;

                data = module_lookup_index_nextvalid(index);
        }

        if (data == NULL) {
                DEBUGMSGTL((MODNAME_STR, "nextmod: exact match not found for "
                    "index %lu; stopping\n", index));
                snmp_free_varbind(var);
                return (NULL);
        }

        *var->val.integer = data->d_index;
        table_info->indexes = var;
        table_info->number_indexes = 1;

        DEBUGMSGTL((MODNAME_STR, "matching data is %lu/%s@%p\n", data->d_index,
            data->d_ami_name, data));

        return (data);
}

/*ARGSUSED*/
static sunFmModule_data_t *
sunFmModuleTable_mod(netsnmp_handler_registration *reginfo,
    netsnmp_table_request_info *table_info)
{
        ASSERT(table_info->number_indexes == 1);

        return (module_lookup_index_exact(table_info->index_oid[0]));
}

/*ARGSUSED*/
static void
sunFmModuleTable_return(unsigned int reg, void *arg)
{
        netsnmp_delegated_cache         *cache = (netsnmp_delegated_cache *)arg;
        netsnmp_request_info            *request;
        netsnmp_agent_request_info      *reqinfo;
        netsnmp_handler_registration    *reginfo;
        netsnmp_table_request_info      *table_info;
        sunFmModule_data_t              *data;
        ulong_t                         modstate;

        ASSERT(netsnmp_handler_check_cache(cache) != NULL);

        (void) pthread_mutex_lock(&update_lock);
        if (update_status != US_QUIET) {
                struct timeval                  tv;

                tv.tv_sec = UPDATE_WAIT_MILLIS / 1000;
                tv.tv_usec = (UPDATE_WAIT_MILLIS % 1000) * 1000;

                (void) snmp_alarm_register_hr(tv, 0, sunFmModuleTable_return,
                    cache);
                (void) pthread_mutex_unlock(&update_lock);
                return;
        }

        request = cache->requests;
        reqinfo = cache->reqinfo;
        reginfo = cache->reginfo;

        table_info = netsnmp_extract_table_info(request);
        request->delegated = 0;

        ASSERT(table_info->colnum >= SUNFMMODULE_COLMIN);
        ASSERT(table_info->colnum <= SUNFMMODULE_COLMAX);

        /*
         * table_info->colnum contains the column number requested.
         * table_info->indexes contains a linked list of snmp variable
         * bindings for the indexes of the table.  Values in the list
         * have been set corresponding to the indexes of the
         * request.  We have other guarantees as well:
         *
         * - The column number is always within range.
         * - If we have no index data, table_info->index_oid_len is 0.
         * - We will never receive requests outside our table nor
         *   those with the first subid anything other than 1 (Entry)
         *   nor those without a column number.  This is true even
         *   for GETNEXT requests.
         */

        switch (reqinfo->mode) {
        case MODE_GET:
                if ((data = sunFmModuleTable_mod(reginfo, table_info)) ==
                    NULL) {
                        netsnmp_free_delegated_cache(cache);
                        (void) pthread_mutex_unlock(&update_lock);
                        return;
                }
                break;
        case MODE_GETNEXT:
        case MODE_GETBULK:
                if ((data = sunFmModuleTable_nextmod(reginfo, table_info)) ==
                    NULL) {
                        netsnmp_free_delegated_cache(cache);
                        (void) pthread_mutex_unlock(&update_lock);
                        return;
                }
                break;
        default:
                (void) snmp_log(LOG_ERR, MODNAME_STR ": Unsupported request "
                    "mode %d\n", reqinfo->mode);
                netsnmp_free_delegated_cache(cache);
                (void) pthread_mutex_unlock(&update_lock);
                return;
        }

        switch (table_info->colnum) {
        case SUNFMMODULE_COL_NAME:
                (void) netsnmp_table_build_result(reginfo, request, table_info,
                    ASN_OCTET_STR, (uchar_t *)data->d_ami_name,
                    strlen(data->d_ami_name));
                break;
        case SUNFMMODULE_COL_VERSION:
                (void) netsnmp_table_build_result(reginfo, request, table_info,
                    ASN_OCTET_STR, (uchar_t *)data->d_ami_vers,
                    strlen(data->d_ami_vers));
                break;
        case SUNFMMODULE_COL_STATUS:
                modstate = (data->d_ami_flags & FMD_ADM_MOD_FAILED) ?
                    SUNFMMODULE_STATE_FAILED : SUNFMMODULE_STATE_ACTIVE;
                (void) netsnmp_table_build_result(reginfo, request, table_info,
                    ASN_INTEGER, (uchar_t *)&modstate,
                    sizeof (modstate));
                break;
        case SUNFMMODULE_COL_DESCRIPTION:
                (void) netsnmp_table_build_result(reginfo, request, table_info,
                    ASN_OCTET_STR, (uchar_t *)data->d_ami_desc,
                    strlen(data->d_ami_desc));
                break;
        default:
                break;
        }
        netsnmp_free_delegated_cache(cache);
        (void) pthread_mutex_unlock(&update_lock);
}

static int
sunFmModuleTable_handler(netsnmp_mib_handler *handler,
    netsnmp_handler_registration *reginfo, netsnmp_agent_request_info *reqinfo,
    netsnmp_request_info *requests)
{
        netsnmp_request_info            *request;
        struct timeval                  tv;

        tv.tv_sec = UPDATE_WAIT_MILLIS / 1000;
        tv.tv_usec = (UPDATE_WAIT_MILLIS % 1000) * 1000;

        request_update();

        for (request = requests; request; request = request->next) {
                if (request->processed != 0)
                        continue;

                if (netsnmp_extract_table_info(request) == NULL)
                        continue;

                request->delegated = 1;
                (void) snmp_alarm_register_hr(tv, 0, sunFmModuleTable_return,
                    (void *) netsnmp_create_delegated_cache(handler, reginfo,
                    reqinfo, request, NULL));
        }

        return (SNMP_ERR_NOERROR);
}