corosync/services/cpg.c

/*
 * Copyright (c) 2006-2009 Red Hat, Inc.
 *
 * All rights reserved.
 *
 * Author: Christine Caulfield (ccaulfie@redhat.com)
 * Author: Jan Friesse (jfriesse@redhat.com)
 *
 * This software licensed under BSD license, the text of which follows:
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 * - Neither the name of the MontaVista Software, Inc. nor the names of its
 *   contributors may be used to endorse or promote products derived from this
 *   software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <config.h>

#ifdef HAVE_ALLOCA_H
#include <alloca.h>
#endif
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <sys/uio.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <time.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include <corosync/corotypes.h>
#include <corosync/coroipc_types.h>
#include <corosync/corodefs.h>
#include <corosync/list.h>
#include <corosync/jhash.h>
#include <corosync/lcr/lcr_comp.h>
#include <corosync/engine/logsys.h>
#include <corosync/engine/coroapi.h>

#include <corosync/cpg.h>
#include <corosync/ipc_cpg.h>

LOGSYS_DECLARE_SUBSYS ("CPG");

#define GROUP_HASH_SIZE 32

enum cpg_message_req_types {
	MESSAGE_REQ_EXEC_CPG_PROCJOIN = 0,
	MESSAGE_REQ_EXEC_CPG_PROCLEAVE = 1,
	MESSAGE_REQ_EXEC_CPG_JOINLIST = 2,
	MESSAGE_REQ_EXEC_CPG_MCAST = 3,
	MESSAGE_REQ_EXEC_CPG_DOWNLIST = 4
};

/*
 * state`		exec deliver
 * match group name, pid -> if matched deliver for YES:
 * XXX indicates impossible state
 *
 *			join			leave			mcast
 * UNJOINED		XXX			XXX			NO
 * LEAVE_STARTED	XXX			YES(unjoined_enter)	YES
 * JOIN_STARTED		YES(join_started_enter)	XXX			NO
 * JOIN_COMPLETED	XXX			NO			YES
 *
 * join_started_enter
 * 	set JOIN_COMPLETED
 *	add entry to process_info list
 * unjoined_enter
 *	set UNJOINED
 *	delete entry from process_info list
 *
 *
 *			library accept join error codes
 * UNJOINED		YES(CPG_OK) 			set JOIN_STARTED
 * LEAVE_STARTED	NO(CPG_ERR_BUSY)
 * JOIN_STARTED		NO(CPG_ERR_EXIST)
 * JOIN_COMPlETED	NO(CPG_ERR_EXIST)
 *
 *			library accept leave error codes
 * UNJOINED		NO(CPG_ERR_NOT_EXIST)
 * LEAVE_STARTED	NO(CPG_ERR_NOT_EXIST)
 * JOIN_STARTED		NO(CPG_ERR_BUSY)
 * JOIN_COMPLETED	YES(CPG_OK)			set LEAVE_STARTED
 *
 *			library accept mcast
 * UNJOINED		NO(CPG_ERR_NOT_EXIST)
 * LEAVE_STARTED	NO(CPG_ERR_NOT_EXIST)
 * JOIN_STARTED		YES(CPG_OK)
 * JOIN_COMPLETED	YES(CPG_OK)
 */
enum cpd_state {
	CPD_STATE_UNJOINED,
	CPD_STATE_LEAVE_STARTED,
	CPD_STATE_JOIN_STARTED,
	CPD_STATE_JOIN_COMPLETED
};

enum cpg_sync_state {
	CPGSYNC_DOWNLIST,
	CPGSYNC_JOINLIST
};


struct cpg_pd {
	void *conn;
 	mar_cpg_name_t group_name;
	uint32_t pid;
	enum cpd_state cpd_state;
	struct list_head list;
	struct list_head iteration_instance_list_head;
};

struct cpg_iteration_instance {
	hdb_handle_t handle;
	struct list_head list;
	struct list_head items_list_head; /* List of process_info */
	struct list_head *current_pointer;
};

DECLARE_HDB_DATABASE(cpg_iteration_handle_t_db,NULL);

DECLARE_LIST_INIT(cpg_pd_list_head);

static unsigned int my_member_list[PROCESSOR_COUNT_MAX];

static unsigned int my_member_list_entries;

static unsigned int my_old_member_list[PROCESSOR_COUNT_MAX];

static unsigned int my_old_member_list_entries = 0;

static struct corosync_api_v1 *api = NULL;

static enum cpg_sync_state my_sync_state = CPGSYNC_DOWNLIST;

struct process_info {
	unsigned int nodeid;
	uint32_t pid;
	mar_cpg_name_t group;
	struct list_head list; /* on the group_info members list */
};
DECLARE_LIST_INIT(process_info_list_head);

struct join_list_entry {
	uint32_t pid;
	mar_cpg_name_t group_name;
};

/*
 * Service Interfaces required by service_message_handler struct
 */
static int cpg_exec_init_fn (struct corosync_api_v1 *);

static int cpg_lib_init_fn (void *conn);

static int cpg_lib_exit_fn (void *conn);

static void message_handler_req_exec_cpg_procjoin (
	const void *message,
	unsigned int nodeid);

static void message_handler_req_exec_cpg_procleave (
	const void *message,
	unsigned int nodeid);

static void message_handler_req_exec_cpg_joinlist (
	const void *message,
	unsigned int nodeid);

static void message_handler_req_exec_cpg_mcast (
	const void *message,
	unsigned int nodeid);

static void message_handler_req_exec_cpg_downlist (
	const void *message,
	unsigned int nodeid);

static void exec_cpg_procjoin_endian_convert (void *msg);

static void exec_cpg_joinlist_endian_convert (void *msg);

static void exec_cpg_mcast_endian_convert (void *msg);

static void exec_cpg_downlist_endian_convert (void *msg);

static void message_handler_req_lib_cpg_join (void *conn, const void *message);

static void message_handler_req_lib_cpg_leave (void *conn, const void *message);

static void message_handler_req_lib_cpg_mcast (void *conn, const void *message);

static void message_handler_req_lib_cpg_membership (void *conn,
						    const void *message);

static void message_handler_req_lib_cpg_local_get (void *conn,
						   const void *message);

static void message_handler_req_lib_cpg_iteration_initialize (
	void *conn,
	const void *message);

static void message_handler_req_lib_cpg_iteration_next (
	void *conn,
	const void *message);

static void message_handler_req_lib_cpg_iteration_finalize (
	void *conn,
	const void *message);

static int cpg_node_joinleave_send (unsigned int pid, const mar_cpg_name_t *group_name, int fn, int reason);

static int cpg_exec_send_downlist(void);

static int cpg_exec_send_joinlist(void);

static void cpg_sync_init_v2 (
	const unsigned int *trans_list,
	size_t trans_list_entries,
	const unsigned int *member_list,
	size_t member_list_entries,
	const struct memb_ring_id *ring_id);

static int  cpg_sync_process (void);

static void cpg_sync_activate (void);

static void cpg_sync_abort (void);

/*
 * Library Handler Definition
 */
static struct corosync_lib_handler cpg_lib_engine[] =
{
	{ /* 0 */
		.lib_handler_fn				= message_handler_req_lib_cpg_join,
		.flow_control				= CS_LIB_FLOW_CONTROL_REQUIRED
	},
	{ /* 1 */
		.lib_handler_fn				= message_handler_req_lib_cpg_leave,
		.flow_control				= CS_LIB_FLOW_CONTROL_REQUIRED
	},
	{ /* 2 */
		.lib_handler_fn				= message_handler_req_lib_cpg_mcast,
		.flow_control				= CS_LIB_FLOW_CONTROL_REQUIRED
	},
	{ /* 3 */
		.lib_handler_fn				= message_handler_req_lib_cpg_membership,
		.flow_control				= CS_LIB_FLOW_CONTROL_NOT_REQUIRED
	},
	{ /* 4 */
		.lib_handler_fn				= message_handler_req_lib_cpg_local_get,
		.flow_control				= CS_LIB_FLOW_CONTROL_NOT_REQUIRED
	},
	{ /* 5 */
		.lib_handler_fn				= message_handler_req_lib_cpg_iteration_initialize,
		.flow_control				= CS_LIB_FLOW_CONTROL_NOT_REQUIRED
	},
	{ /* 6 */
		.lib_handler_fn				= message_handler_req_lib_cpg_iteration_next,
		.flow_control				= CS_LIB_FLOW_CONTROL_NOT_REQUIRED
	},
	{ /* 7 */
		.lib_handler_fn				= message_handler_req_lib_cpg_iteration_finalize,
		.flow_control				= CS_LIB_FLOW_CONTROL_NOT_REQUIRED
	},
};

static struct corosync_exec_handler cpg_exec_engine[] =
{
	{ /* 0 */
		.exec_handler_fn	= message_handler_req_exec_cpg_procjoin,
		.exec_endian_convert_fn	= exec_cpg_procjoin_endian_convert
	},
	{ /* 1 */
		.exec_handler_fn	= message_handler_req_exec_cpg_procleave,
		.exec_endian_convert_fn	= exec_cpg_procjoin_endian_convert
	},
	{ /* 2 */
		.exec_handler_fn	= message_handler_req_exec_cpg_joinlist,
		.exec_endian_convert_fn	= exec_cpg_joinlist_endian_convert
	},
	{ /* 3 */
		.exec_handler_fn	= message_handler_req_exec_cpg_mcast,
		.exec_endian_convert_fn	= exec_cpg_mcast_endian_convert
	},
	{ /* 4 */
		.exec_handler_fn	= message_handler_req_exec_cpg_downlist,
		.exec_endian_convert_fn	= exec_cpg_downlist_endian_convert
	},
};

struct corosync_service_engine cpg_service_engine = {
	.name				        = "corosync cluster closed process group service v1.01",
	.id					= CPG_SERVICE,
	.priority				= 1,
	.private_data_size			= sizeof (struct cpg_pd),
	.flow_control				= CS_LIB_FLOW_CONTROL_REQUIRED,
	.allow_inquorate			= CS_LIB_ALLOW_INQUORATE,
	.lib_init_fn				= cpg_lib_init_fn,
	.lib_exit_fn				= cpg_lib_exit_fn,
	.lib_engine				= cpg_lib_engine,
	.lib_engine_count			= sizeof (cpg_lib_engine) / sizeof (struct corosync_lib_handler),
	.exec_init_fn				= cpg_exec_init_fn,
	.exec_dump_fn				= NULL,
	.exec_engine				= cpg_exec_engine,
	.exec_engine_count		        = sizeof (cpg_exec_engine) / sizeof (struct corosync_exec_handler),
	.sync_mode				= CS_SYNC_V1_APIV2,
	.sync_init                              = cpg_sync_init_v2,
	.sync_process                           = cpg_sync_process,
	.sync_activate                          = cpg_sync_activate,
	.sync_abort                             = cpg_sync_abort
};

/*
 * Dynamic loader definition
 */
static struct corosync_service_engine *cpg_get_service_engine_ver0 (void);

static struct corosync_service_engine_iface_ver0 cpg_service_engine_iface = {
	.corosync_get_service_engine_ver0		= cpg_get_service_engine_ver0
};

static struct lcr_iface corosync_cpg_ver0[1] = {
	{
		.name				= "corosync_cpg",
		.version			= 0,
		.versions_replace		= 0,
		.versions_replace_count         = 0,
		.dependencies			= 0,
		.dependency_count		= 0,
		.constructor			= NULL,
		.destructor			= NULL,
		.interfaces			= NULL
	}
};

static struct lcr_comp cpg_comp_ver0 = {
	.iface_count			= 1,
	.ifaces			        = corosync_cpg_ver0
};


static struct corosync_service_engine *cpg_get_service_engine_ver0 (void)
{
	return (&cpg_service_engine);
}

#ifdef COROSYNC_SOLARIS
void corosync_lcr_component_register (void);

void corosync_lcr_component_register (void) {
#else
__attribute__ ((constructor)) static void corosync_lcr_component_register (void) {
#endif
        lcr_interfaces_set (&corosync_cpg_ver0[0], &cpg_service_engine_iface);

	lcr_component_register (&cpg_comp_ver0);
}

struct req_exec_cpg_procjoin {
	coroipc_request_header_t header __attribute__((aligned(8)));
	mar_cpg_name_t group_name __attribute__((aligned(8)));
	mar_uint32_t pid __attribute__((aligned(8)));
	mar_uint32_t reason __attribute__((aligned(8)));
};

struct req_exec_cpg_mcast {
	coroipc_request_header_t header __attribute__((aligned(8)));
	mar_cpg_name_t group_name __attribute__((aligned(8)));
	mar_uint32_t msglen __attribute__((aligned(8)));
	mar_uint32_t pid __attribute__((aligned(8)));
	mar_message_source_t source __attribute__((aligned(8)));
	mar_uint8_t message[] __attribute__((aligned(8)));
};

struct req_exec_cpg_downlist {
	coroipc_request_header_t header __attribute__((aligned(8)));
	mar_uint32_t left_nodes __attribute__((aligned(8)));
	mar_uint32_t nodeids[PROCESSOR_COUNT_MAX]  __attribute__((aligned(8)));
};

static struct req_exec_cpg_downlist g_req_exec_cpg_downlist;

static void cpg_sync_init_v2 (
	const unsigned int *trans_list,
	size_t trans_list_entries,
	const unsigned int *member_list,
	size_t member_list_entries,
	const struct memb_ring_id *ring_id)
{
	unsigned int lowest_nodeid = 0xffffffff;
	int entries;
	int i, j;
	int found;

	my_sync_state = CPGSYNC_DOWNLIST;

	memcpy (my_member_list, member_list, member_list_entries *
		sizeof (unsigned int));
	my_member_list_entries = member_list_entries;

	for (i = 0; i < my_member_list_entries; i++) {
		if (my_member_list[i] < lowest_nodeid) {
			lowest_nodeid = my_member_list[i];
		}
	}

	entries = 0;
	if (lowest_nodeid == api->totem_nodeid_get()) {
		/*
		 * Determine list of nodeids for downlist message
		 */
		for (i = 0; i < my_old_member_list_entries; i++) {
			found = 0;
			for (j = 0; j < trans_list_entries; j++) {
				if (my_old_member_list[i] == trans_list[j]) {
					found = 1;
					break;
				}
			}
			if (found == 0) {
				g_req_exec_cpg_downlist.nodeids[entries++] =
					my_old_member_list[i];
			}
		}
	}
	g_req_exec_cpg_downlist.left_nodes = entries;
}

static int cpg_sync_process (void)
{
	int res = -1;

	if (my_sync_state == CPGSYNC_DOWNLIST) {
		res = cpg_exec_send_downlist();
		if (res == -1) {
			return (-1);
		}
		my_sync_state = CPGSYNC_JOINLIST;
	}
	if (my_sync_state == CPGSYNC_JOINLIST) {
		res = cpg_exec_send_joinlist();
	}
	return (res);
}

static void cpg_sync_activate (void)
{
	memcpy (my_old_member_list, my_member_list,
		my_member_list_entries * sizeof (unsigned int));
	my_old_member_list_entries = my_member_list_entries;
}

static void cpg_sync_abort (void)
{
}



static int notify_lib_joinlist(
	const mar_cpg_name_t *group_name,
	void *conn,
	int joined_list_entries,
	mar_cpg_address_t *joined_list,
	int left_list_entries,
	mar_cpg_address_t *left_list,
	int id)
{
	int size;
	char *buf;
	struct list_head *iter;
	int count;
	struct res_lib_cpg_confchg_callback *res;
	mar_cpg_address_t *retgi;

	count = 0;

	for (iter = process_info_list_head.next; iter != &process_info_list_head; iter = iter->next) {
		struct process_info *pi = list_entry (iter, struct process_info, list);
		if (mar_name_compare (&pi->group, group_name) == 0) {
			int i;
			int founded = 0;

			for (i = 0; i < left_list_entries; i++) {
				if (left_list[i].nodeid == pi->nodeid && left_list[i].pid == pi->pid) {
					founded++;
				}
			}

			if (!founded)
				count++;
		}
	}

	size = sizeof(struct res_lib_cpg_confchg_callback) +
		sizeof(mar_cpg_address_t) * (count + left_list_entries + joined_list_entries);
	buf = alloca(size);
	if (!buf)
		return CPG_ERR_LIBRARY;

	res = (struct res_lib_cpg_confchg_callback *)buf;
	res->joined_list_entries = joined_list_entries;
	res->left_list_entries = left_list_entries;
	res->member_list_entries = count;
	retgi = res->member_list;
	res->header.size = size;
	res->header.id = id;
	res->header.error = CS_OK;
	memcpy(&res->group_name, group_name, sizeof(mar_cpg_name_t));

	for (iter = process_info_list_head.next; iter != &process_info_list_head; iter = iter->next) {
		struct process_info *pi=list_entry (iter, struct process_info, list);

		if (mar_name_compare (&pi->group, group_name) == 0) {
			int i;
			int founded = 0;

			for (i = 0;i < left_list_entries; i++) {
				if (left_list[i].nodeid == pi->nodeid && left_list[i].pid == pi->pid) {
					founded++;
				}
			}

			if (!founded) {
				retgi->nodeid = pi->nodeid;
				retgi->pid = pi->pid;
				retgi++;
			}
		}
	}

	if (left_list_entries) {
		memcpy (retgi, left_list, left_list_entries * sizeof(mar_cpg_address_t));
		retgi += left_list_entries;
	}

	if (joined_list_entries) {
		memcpy (retgi, joined_list, joined_list_entries * sizeof(mar_cpg_address_t));
		retgi += joined_list_entries;
	}

	if (conn) {
		api->ipc_dispatch_send (conn, buf, size);
	} else {
		for (iter = cpg_pd_list_head.next; iter != &cpg_pd_list_head; iter = iter->next) {
			struct cpg_pd *cpd = list_entry (iter, struct cpg_pd, list);
			if (mar_name_compare (&cpd->group_name, group_name) == 0) {
				assert (left_list_entries <= 1);
				assert (joined_list_entries <= 1);
				if (joined_list_entries) {
					if (joined_list[0].pid == cpd->pid &&
						joined_list[0].nodeid == api->totem_nodeid_get()) {
						cpd->cpd_state = CPD_STATE_JOIN_COMPLETED;
					}
				}
				if (cpd->cpd_state == CPD_STATE_JOIN_COMPLETED ||
					cpd->cpd_state == CPD_STATE_LEAVE_STARTED) {

					api->ipc_dispatch_send (cpd->conn, buf, size);
				}
				if (left_list_entries) {
					if (left_list[0].pid == cpd->pid &&
						left_list[0].nodeid == api->totem_nodeid_get()) {

						cpd->pid = 0;
						memset (&cpd->group_name, 0, sizeof(cpd->group_name));
						cpd->cpd_state = CPD_STATE_UNJOINED;
					}
				}
			}
		}
	}

	return CPG_OK;
}

static int cpg_exec_init_fn (struct corosync_api_v1 *corosync_api)
{
#ifdef COROSYNC_SOLARIS
	logsys_subsys_init();
#endif
	api = corosync_api;
	return (0);
}

static void cpg_iteration_instance_finalize (struct cpg_iteration_instance *cpg_iteration_instance)
{
	struct list_head *iter, *iter_next;
	struct process_info *pi;

	for (iter = cpg_iteration_instance->items_list_head.next;
		iter != &cpg_iteration_instance->items_list_head;
		iter = iter_next) {

		iter_next = iter->next;

		pi = list_entry (iter, struct process_info, list);
		list_del (&pi->list);
		free (pi);
	}

	list_del (&cpg_iteration_instance->list);
	hdb_handle_destroy (&cpg_iteration_handle_t_db, cpg_iteration_instance->handle);
}

static void cpg_pd_finalize (struct cpg_pd *cpd)
{
	struct list_head *iter, *iter_next;
	struct cpg_iteration_instance *cpii;

	for (iter = cpd->iteration_instance_list_head.next;
		iter != &cpd->iteration_instance_list_head;
		iter = iter_next) {

		iter_next = iter->next;

		cpii = list_entry (iter, struct cpg_iteration_instance, list);

		cpg_iteration_instance_finalize (cpii);
	}

	list_del (&cpd->list);
}

static int cpg_lib_exit_fn (void *conn)
{
	struct cpg_pd *cpd = (struct cpg_pd *)api->ipc_private_data_get (conn);

	log_printf(LOGSYS_LEVEL_DEBUG, "exit_fn for conn=%p\n", conn);

	if (cpd->group_name.length > 0) {
		cpg_node_joinleave_send (cpd->pid, &cpd->group_name,
				MESSAGE_REQ_EXEC_CPG_PROCLEAVE, CONFCHG_CPG_REASON_LEAVE);
	}

	cpg_pd_finalize (cpd);

	api->ipc_refcnt_dec (conn);
	return (0);
}

static int cpg_node_joinleave_send (unsigned int pid, const mar_cpg_name_t *group_name, int fn, int reason)
{
	struct req_exec_cpg_procjoin req_exec_cpg_procjoin;
	struct iovec req_exec_cpg_iovec;
	int result;

	memcpy(&req_exec_cpg_procjoin.group_name, group_name, sizeof(mar_cpg_name_t));
	req_exec_cpg_procjoin.pid = pid;
	req_exec_cpg_procjoin.reason = reason;

	req_exec_cpg_procjoin.header.size = sizeof(req_exec_cpg_procjoin);
	req_exec_cpg_procjoin.header.id = SERVICE_ID_MAKE(CPG_SERVICE, fn);

	req_exec_cpg_iovec.iov_base = (char *)&req_exec_cpg_procjoin;
	req_exec_cpg_iovec.iov_len = sizeof(req_exec_cpg_procjoin);

	result = api->totem_mcast (&req_exec_cpg_iovec, 1, TOTEM_AGREED);

	return (result);
}

/* Can byteswap join & leave messages */
static void exec_cpg_procjoin_endian_convert (void *msg)
{
	struct req_exec_cpg_procjoin *req_exec_cpg_procjoin = msg;

	req_exec_cpg_procjoin->pid = swab32(req_exec_cpg_procjoin->pid);
	swab_mar_cpg_name_t (&req_exec_cpg_procjoin->group_name);
	req_exec_cpg_procjoin->reason = swab32(req_exec_cpg_procjoin->reason);
}

static void exec_cpg_joinlist_endian_convert (void *msg_v)
{
	char *msg = msg_v;
	coroipc_response_header_t *res = (coroipc_response_header_t *)msg;
	struct join_list_entry *jle = (struct join_list_entry *)(msg + sizeof(coroipc_response_header_t));

	swab_mar_int32_t (&res->size);

	while ((const char*)jle < msg + res->size) {
		jle->pid = swab32(jle->pid);
		swab_mar_cpg_name_t (&jle->group_name);
		jle++;
	}
}

static void exec_cpg_downlist_endian_convert (void *msg)
{
	struct req_exec_cpg_downlist *req_exec_cpg_downlist = msg;
	unsigned int i;

	req_exec_cpg_downlist->left_nodes = swab32(req_exec_cpg_downlist->left_nodes);

	for (i = 0; i < req_exec_cpg_downlist->left_nodes; i++) {
		req_exec_cpg_downlist->nodeids[i] = swab32(req_exec_cpg_downlist->nodeids[i]);
	}
}


static void exec_cpg_mcast_endian_convert (void *msg)
{
	struct req_exec_cpg_mcast *req_exec_cpg_mcast = msg;

	swab_coroipc_request_header_t (&req_exec_cpg_mcast->header);
	swab_mar_cpg_name_t (&req_exec_cpg_mcast->group_name);
	req_exec_cpg_mcast->pid = swab32(req_exec_cpg_mcast->pid);
	req_exec_cpg_mcast->msglen = swab32(req_exec_cpg_mcast->msglen);
	swab_mar_message_source_t (&req_exec_cpg_mcast->source);
}

static struct process_info *process_info_find(const mar_cpg_name_t *group_name, uint32_t pid, unsigned int nodeid) {
	struct list_head *iter;

	for (iter = process_info_list_head.next; iter != &process_info_list_head; ) {
		struct process_info *pi = list_entry (iter, struct process_info, list);
		iter = iter->next;

		if (pi->pid == pid && pi->nodeid == nodeid &&
			mar_name_compare (&pi->group, group_name) == 0) {
				return pi;
		}
	}

	return NULL;
}

static void do_proc_join(
	const mar_cpg_name_t *name,
	uint32_t pid,
	unsigned int nodeid,
	int reason)
{
	struct process_info *pi;
	struct process_info *pi_entry;
	mar_cpg_address_t notify_info;
	struct list_head *list;
	struct list_head *list_to_add = NULL;

	if (process_info_find (name, pid, nodeid) != NULL) {
		return ;
 	}
	pi = malloc (sizeof (struct process_info));
	if (!pi) {
		log_printf(LOGSYS_LEVEL_WARNING, "Unable to allocate process_info struct");
		return;
	}
	pi->nodeid = nodeid;
	pi->pid = pid;
	memcpy(&pi->group, name, sizeof(*name));
	list_init(&pi->list);

	/*
	 * Insert new process in sorted order so synchronization works properly
	 */
	list_to_add = &process_info_list_head;
	for (list = process_info_list_head.next; list != &process_info_list_head; list = list->next) {

		pi_entry = list_entry(list, struct process_info, list);
		if (pi_entry->nodeid > pi->nodeid ||
			(pi_entry->nodeid == pi->nodeid && pi_entry->pid > pi->pid)) {

			break;
		}
		list_to_add = list;
	}
	list_splice (&pi->list, list_to_add);

	notify_info.pid = pi->pid;
	notify_info.nodeid = nodeid;
	notify_info.reason = reason;

	notify_lib_joinlist(&pi->group, NULL,
			    1, &notify_info,
			    0, NULL,
			    MESSAGE_RES_CPG_CONFCHG_CALLBACK);
}

static void message_handler_req_exec_cpg_downlist (
	const void *message,
	unsigned int nodeid)
{
	const struct req_exec_cpg_downlist *req_exec_cpg_downlist = message;
	int i;
	mar_cpg_address_t left_list[1];
	struct list_head *iter;

	/*
		FOR OPTIMALIZATION - Make list of lists
	*/

	log_printf (LOGSYS_LEVEL_DEBUG, "downlist left_list: %d\n", req_exec_cpg_downlist->left_nodes);

	for (iter = process_info_list_head.next; iter != &process_info_list_head; ) {
		struct process_info *pi = list_entry(iter, struct process_info, list);
		iter = iter->next;

		for (i = 0; i < req_exec_cpg_downlist->left_nodes; i++) {
			if (pi->nodeid == req_exec_cpg_downlist->nodeids[i]) {
				left_list[0].nodeid = pi->nodeid;
				left_list[0].pid = pi->pid;
				left_list[0].reason = CONFCHG_CPG_REASON_NODEDOWN;

				notify_lib_joinlist(&pi->group, NULL,
                                	            0, NULL,
                                        	    1, left_list,
	                                            MESSAGE_RES_CPG_CONFCHG_CALLBACK);
				list_del (&pi->list);
				free (pi);
				break;
			}
		}
	}
}

static void message_handler_req_exec_cpg_procjoin (
	const void *message,
	unsigned int nodeid)
{
	const struct req_exec_cpg_procjoin *req_exec_cpg_procjoin = message;

	log_printf(LOGSYS_LEVEL_DEBUG, "got procjoin message from cluster node %d\n", nodeid);

	do_proc_join (&req_exec_cpg_procjoin->group_name,
		req_exec_cpg_procjoin->pid, nodeid,
		CONFCHG_CPG_REASON_JOIN);
}

static void message_handler_req_exec_cpg_procleave (
	const void *message,
	unsigned int nodeid)
{
	const struct req_exec_cpg_procjoin *req_exec_cpg_procjoin = message;
	struct process_info *pi;
	struct list_head *iter;
	mar_cpg_address_t notify_info;

	log_printf(LOGSYS_LEVEL_DEBUG, "got procleave message from cluster node %d\n", nodeid);

	notify_info.pid = req_exec_cpg_procjoin->pid;
	notify_info.nodeid = nodeid;
	notify_info.reason = req_exec_cpg_procjoin->reason;

	notify_lib_joinlist(&req_exec_cpg_procjoin->group_name, NULL,
		0, NULL,
		1, &notify_info,
		MESSAGE_RES_CPG_CONFCHG_CALLBACK);

	for (iter = process_info_list_head.next; iter != &process_info_list_head; ) {
		pi = list_entry(iter, struct process_info, list);
		iter = iter->next;

		if (pi->pid == req_exec_cpg_procjoin->pid && pi->nodeid == nodeid &&
			mar_name_compare (&pi->group, &req_exec_cpg_procjoin->group_name)==0) {
			list_del (&pi->list);
			free (pi);
		}
	}
}


/* Got a proclist from another node */
static void message_handler_req_exec_cpg_joinlist (
	const void *message_v,
	unsigned int nodeid)
{
	const char *message = message_v;
	const coroipc_response_header_t *res = (const coroipc_response_header_t *)message;
	const struct join_list_entry *jle = (const struct join_list_entry *)(message + sizeof(coroipc_response_header_t));

	log_printf(LOGSYS_LEVEL_DEBUG, "got joinlist message from node %x\n",
		nodeid);

	/* Ignore our own messages */
	if (nodeid == api->totem_nodeid_get()) {
		return;
	}

	while ((const char*)jle < message + res->size) {
		do_proc_join (&jle->group_name, jle->pid, nodeid,
			CONFCHG_CPG_REASON_NODEUP);
		jle++;
	}
}

static void message_handler_req_exec_cpg_mcast (
	const void *message,
	unsigned int nodeid)
{
	const struct req_exec_cpg_mcast *req_exec_cpg_mcast = message;
	struct res_lib_cpg_deliver_callback res_lib_cpg_mcast;
	int msglen = req_exec_cpg_mcast->msglen;
	struct list_head *iter, *pi_iter;
	struct cpg_pd *cpd;
	struct iovec iovec[2];
	int known_node = 0;

	res_lib_cpg_mcast.header.id = MESSAGE_RES_CPG_DELIVER_CALLBACK;
	res_lib_cpg_mcast.header.size = sizeof(res_lib_cpg_mcast) + msglen;
	res_lib_cpg_mcast.msglen = msglen;
	res_lib_cpg_mcast.pid = req_exec_cpg_mcast->pid;
	res_lib_cpg_mcast.nodeid = nodeid;

	memcpy(&res_lib_cpg_mcast.group_name, &req_exec_cpg_mcast->group_name,
		sizeof(mar_cpg_name_t));
	iovec[0].iov_base = (void *)&res_lib_cpg_mcast;
	iovec[0].iov_len = sizeof (res_lib_cpg_mcast);

	iovec[1].iov_base = (char*)message+sizeof(*req_exec_cpg_mcast);
	iovec[1].iov_len = msglen;

	for (iter = cpg_pd_list_head.next; iter != &cpg_pd_list_head; ) {
		cpd = list_entry(iter, struct cpg_pd, list);
		iter = iter->next;

		if ((cpd->cpd_state == CPD_STATE_LEAVE_STARTED || cpd->cpd_state == CPD_STATE_JOIN_COMPLETED)
			&& (mar_name_compare (&cpd->group_name, &req_exec_cpg_mcast->group_name) == 0)) {

			if (!known_node) {
				/* Try to find, if we know the node */
				for (pi_iter = process_info_list_head.next;
					pi_iter != &process_info_list_head; pi_iter = pi_iter->next) {

					struct process_info *pi = list_entry (pi_iter, struct process_info, list);

					if (pi->nodeid == nodeid &&
						mar_name_compare (&pi->group, &req_exec_cpg_mcast->group_name) == 0) {
						known_node = 1;
						break;
					}
				}
			}

			if (!known_node) {
				/* Unknown node -> we will not deliver message */
				return ;
			}

			api->ipc_dispatch_iov_send (cpd->conn, iovec, 2);
		}
	}
}


static int cpg_exec_send_downlist(void)
{
	struct iovec iov;

	g_req_exec_cpg_downlist.header.id = SERVICE_ID_MAKE(CPG_SERVICE, MESSAGE_REQ_EXEC_CPG_DOWNLIST);
	g_req_exec_cpg_downlist.header.size = sizeof(struct req_exec_cpg_downlist);

	iov.iov_base = (void *)&g_req_exec_cpg_downlist;
	iov.iov_len = g_req_exec_cpg_downlist.header.size;

	return (api->totem_mcast (&iov, 1, TOTEM_AGREED));
}

static int cpg_exec_send_joinlist(void)
{
	int count = 0;
	struct list_head *iter;
	coroipc_response_header_t *res;
 	char *buf;
	struct join_list_entry *jle;
	struct iovec req_exec_cpg_iovec;

 	for (iter = process_info_list_head.next; iter != &process_info_list_head; iter = iter->next) {
 		struct process_info *pi = list_entry (iter, struct process_info, list);

 		if (pi->nodeid == api->totem_nodeid_get ()) {
 			count++;
		}
	}

	/* Nothing to send */
	if (!count)
		return 0;

	buf = alloca(sizeof(coroipc_response_header_t) + sizeof(struct join_list_entry) * count);
	if (!buf) {
		log_printf(LOGSYS_LEVEL_WARNING, "Unable to allocate joinlist buffer");
		return -1;
	}

	jle = (struct join_list_entry *)(buf + sizeof(coroipc_response_header_t));
	res = (coroipc_response_header_t *)buf;

 	for (iter = process_info_list_head.next; iter != &process_info_list_head; iter = iter->next) {
 		struct process_info *pi = list_entry (iter, struct process_info, list);

 		if (pi->nodeid == api->totem_nodeid_get ()) {
 			memcpy (&jle->group_name, &pi->group, sizeof (mar_cpg_name_t));
 			jle->pid = pi->pid;
 			jle++;
		}
	}

	res->id = SERVICE_ID_MAKE(CPG_SERVICE, MESSAGE_REQ_EXEC_CPG_JOINLIST);
	res->size = sizeof(coroipc_response_header_t)+sizeof(struct join_list_entry) * count;

	req_exec_cpg_iovec.iov_base = buf;
	req_exec_cpg_iovec.iov_len = res->size;

	return (api->totem_mcast (&req_exec_cpg_iovec, 1, TOTEM_AGREED));
}

static int cpg_lib_init_fn (void *conn)
{
	struct cpg_pd *cpd = (struct cpg_pd *)api->ipc_private_data_get (conn);
	memset (cpd, 0, sizeof(struct cpg_pd));
	cpd->conn = conn;
	list_add (&cpd->list, &cpg_pd_list_head);

	list_init (&cpd->iteration_instance_list_head);

	api->ipc_refcnt_inc (conn);
	log_printf(LOGSYS_LEVEL_DEBUG, "lib_init_fn: conn=%p, cpd=%p\n", conn, cpd);
	return (0);
}

/* Join message from the library */
static void message_handler_req_lib_cpg_join (void *conn, const void *message)
{
	const struct req_lib_cpg_join *req_lib_cpg_join = message;
	struct cpg_pd *cpd = (struct cpg_pd *)api->ipc_private_data_get (conn);
	struct res_lib_cpg_join res_lib_cpg_join;
	cs_error_t error = CPG_OK;
	struct list_head *iter;

	/* Test, if we don't have same pid and group name joined */
	for (iter = cpg_pd_list_head.next; iter != &cpg_pd_list_head; iter = iter->next) {
		struct cpg_pd *cpd_item = list_entry (iter, struct cpg_pd, list);

		if (cpd_item->pid == req_lib_cpg_join->pid &&
			mar_name_compare(&req_lib_cpg_join->group_name, &cpd_item->group_name) == 0) {

			/* We have same pid and group name joined -> return error */
			error = CPG_ERR_EXIST;
			goto response_send;
		}
	}

	switch (cpd->cpd_state) {
	case CPD_STATE_UNJOINED:
		error = CPG_OK;
		cpd->cpd_state = CPD_STATE_JOIN_STARTED;
		cpd->pid = req_lib_cpg_join->pid;
		memcpy (&cpd->group_name, &req_lib_cpg_join->group_name,
			sizeof (cpd->group_name));

		cpg_node_joinleave_send (req_lib_cpg_join->pid,
			&req_lib_cpg_join->group_name,
			MESSAGE_REQ_EXEC_CPG_PROCJOIN, CONFCHG_CPG_REASON_JOIN);
		break;
	case CPD_STATE_LEAVE_STARTED:
		error = CPG_ERR_BUSY;
		break;
	case CPD_STATE_JOIN_STARTED:
		error = CPG_ERR_EXIST;
		break;
	case CPD_STATE_JOIN_COMPLETED:
		error = CPG_ERR_EXIST;
		break;
	}

response_send:
	res_lib_cpg_join.header.size = sizeof(res_lib_cpg_join);
        res_lib_cpg_join.header.id = MESSAGE_RES_CPG_JOIN;
        res_lib_cpg_join.header.error = error;
        api->ipc_response_send (conn, &res_lib_cpg_join, sizeof(res_lib_cpg_join));
}

/* Leave message from the library */
static void message_handler_req_lib_cpg_leave (void *conn, const void *message)
{
	struct res_lib_cpg_leave res_lib_cpg_leave;
	cs_error_t error = CPG_OK;
	struct req_lib_cpg_leave  *req_lib_cpg_leave = (struct req_lib_cpg_leave *)message;
	struct cpg_pd *cpd = (struct cpg_pd *)api->ipc_private_data_get (conn);

	log_printf(LOGSYS_LEVEL_DEBUG, "got leave request on %p\n", conn);

	switch (cpd->cpd_state) {
	case CPD_STATE_UNJOINED:
		error = CPG_ERR_NOT_EXIST;
		break;
	case CPD_STATE_LEAVE_STARTED:
		error = CPG_ERR_NOT_EXIST;
		break;
	case CPD_STATE_JOIN_STARTED:
		error = CPG_ERR_BUSY;
		break;
	case CPD_STATE_JOIN_COMPLETED:
		error = CPG_OK;
		cpd->cpd_state = CPD_STATE_LEAVE_STARTED;
		cpg_node_joinleave_send (req_lib_cpg_leave->pid,
			&req_lib_cpg_leave->group_name,
			MESSAGE_REQ_EXEC_CPG_PROCLEAVE,
			CONFCHG_CPG_REASON_LEAVE);
		break;
	}

	/* send return */
	res_lib_cpg_leave.header.size = sizeof(res_lib_cpg_leave);
	res_lib_cpg_leave.header.id = MESSAGE_RES_CPG_LEAVE;
	res_lib_cpg_leave.header.error = error;
	api->ipc_response_send(conn, &res_lib_cpg_leave, sizeof(res_lib_cpg_leave));
}

/* Mcast message from the library */
static void message_handler_req_lib_cpg_mcast (void *conn, const void *message)
{
	const struct req_lib_cpg_mcast *req_lib_cpg_mcast = message;
 	struct cpg_pd *cpd = (struct cpg_pd *)api->ipc_private_data_get (conn);
	mar_cpg_name_t group_name = cpd->group_name;

	struct iovec req_exec_cpg_iovec[2];
	struct req_exec_cpg_mcast req_exec_cpg_mcast;
	struct res_lib_cpg_mcast res_lib_cpg_mcast;
	int msglen = req_lib_cpg_mcast->msglen;
	int result;
 	cs_error_t error = CPG_ERR_NOT_EXIST;

	log_printf(LOGSYS_LEVEL_DEBUG, "got mcast request on %p\n", conn);

 	switch (cpd->cpd_state) {
 	case CPD_STATE_UNJOINED:
 		error = CPG_ERR_NOT_EXIST;
 		break;
 	case CPD_STATE_LEAVE_STARTED:
 		error = CPG_ERR_NOT_EXIST;
 		break;
 	case CPD_STATE_JOIN_STARTED:
 		error = CPG_OK;
 		break;
 	case CPD_STATE_JOIN_COMPLETED:
 		error = CPG_OK;
 		break;
	}

 	if (error == CPG_OK) {
 		req_exec_cpg_mcast.header.size = sizeof(req_exec_cpg_mcast) + msglen;
 		req_exec_cpg_mcast.header.id = SERVICE_ID_MAKE(CPG_SERVICE,
 			MESSAGE_REQ_EXEC_CPG_MCAST);
 		req_exec_cpg_mcast.pid = cpd->pid;
 		req_exec_cpg_mcast.msglen = msglen;
 		api->ipc_source_set (&req_exec_cpg_mcast.source, conn);
 		memcpy(&req_exec_cpg_mcast.group_name, &group_name,
 			sizeof(mar_cpg_name_t));

 		req_exec_cpg_iovec[0].iov_base = (char *)&req_exec_cpg_mcast;
 		req_exec_cpg_iovec[0].iov_len = sizeof(req_exec_cpg_mcast);
 		req_exec_cpg_iovec[1].iov_base = (char *)&req_lib_cpg_mcast->message;
 		req_exec_cpg_iovec[1].iov_len = msglen;

 		result = api->totem_mcast (req_exec_cpg_iovec, 2, TOTEM_AGREED);
 		assert(result == 0);
 	}

	res_lib_cpg_mcast.header.size = sizeof(res_lib_cpg_mcast);
	res_lib_cpg_mcast.header.id = MESSAGE_RES_CPG_MCAST;
 	res_lib_cpg_mcast.header.error = error;
 	api->ipc_response_send (conn, &res_lib_cpg_mcast,
 		sizeof (res_lib_cpg_mcast));
}

static void message_handler_req_lib_cpg_membership (void *conn,
						    const void *message)
{
	struct cpg_pd *cpd = (struct cpg_pd *)api->ipc_private_data_get (conn);
	cs_error_t error = CPG_ERR_NOT_EXIST;
	coroipc_response_header_t res;

	switch (cpd->cpd_state) {
	case CPD_STATE_UNJOINED:
		error = CPG_ERR_NOT_EXIST;
		break;
	case CPD_STATE_LEAVE_STARTED:
		error = CPG_ERR_NOT_EXIST;
		break;
	case CPD_STATE_JOIN_STARTED:
		error = CPG_ERR_BUSY;
		break;
	case CPD_STATE_JOIN_COMPLETED:
		error = CPG_OK;
		break;
	}

	res.size = sizeof (res);
	res.id = MESSAGE_RES_CPG_MEMBERSHIP;
	res.error = error;
	api->ipc_response_send (conn, &res, sizeof(res));
		return;

	if (error == CPG_OK) {
		notify_lib_joinlist (&cpd->group_name, conn, 0, NULL, 0, NULL,
			MESSAGE_RES_CPG_MEMBERSHIP);
	}

}

static void message_handler_req_lib_cpg_local_get (void *conn,
						   const void *message)
{
	struct res_lib_cpg_local_get res_lib_cpg_local_get;

	res_lib_cpg_local_get.header.size = sizeof (res_lib_cpg_local_get);
	res_lib_cpg_local_get.header.id = MESSAGE_RES_CPG_LOCAL_GET;
	res_lib_cpg_local_get.header.error = CPG_OK;
	res_lib_cpg_local_get.local_nodeid = api->totem_nodeid_get ();

	api->ipc_response_send (conn, &res_lib_cpg_local_get,
		sizeof (res_lib_cpg_local_get));
}

static void message_handler_req_lib_cpg_iteration_initialize (
	void *conn,
	const void *message)
{
	const struct req_lib_cpg_iterationinitialize *req_lib_cpg_iterationinitialize = message;
	struct cpg_pd *cpd = (struct cpg_pd *)api->ipc_private_data_get (conn);
	hdb_handle_t cpg_iteration_handle = 0;
	struct res_lib_cpg_iterationinitialize res_lib_cpg_iterationinitialize;
	struct list_head *iter, *iter2;
	struct cpg_iteration_instance *cpg_iteration_instance;
	cs_error_t error = CS_OK;
	int res;

	log_printf (LOGSYS_LEVEL_DEBUG, "cpg iteration initialize\n");

	/* Because between calling this function and *next can be some operations which will
	 * change list, we must do full copy.
	 */

	/*
	 * Create new iteration instance
	 */
	res = hdb_handle_create (&cpg_iteration_handle_t_db, sizeof (struct cpg_iteration_instance),
			&cpg_iteration_handle);

	if (res != 0) {
		error = CS_ERR_NO_MEMORY;
		goto response_send;
	}

	res = hdb_handle_get (&cpg_iteration_handle_t_db, cpg_iteration_handle, (void *)&cpg_iteration_instance);

	if (res != 0) {
		error = CS_ERR_BAD_HANDLE;
		goto error_destroy;
	}

	list_init (&cpg_iteration_instance->items_list_head);
	cpg_iteration_instance->handle = cpg_iteration_handle;

	/*
	 * Create copy of process_info list "grouped by" group name
	 */
	for (iter = process_info_list_head.next; iter != &process_info_list_head; iter = iter->next) {
		struct process_info *pi = list_entry (iter, struct process_info, list);
		struct process_info *new_pi;

		if (req_lib_cpg_iterationinitialize->iteration_type == CPG_ITERATION_NAME_ONLY) {
			/*
			 * Try to find processed group name in our list new list
			 */
			int found = 0;

			for (iter2 = cpg_iteration_instance->items_list_head.next;
			     iter2 != &cpg_iteration_instance->items_list_head;
			     iter2 = iter2->next) {
				 struct process_info *pi2 = list_entry (iter2, struct process_info, list);

				 if (mar_name_compare (&pi2->group, &pi->group) == 0) {
					found = 1;
					break;
				 }
			}

			if (found) {
				/*
				 * We have this name in list -> don't add
				 */
				continue ;
			}
		} else if (req_lib_cpg_iterationinitialize->iteration_type == CPG_ITERATION_ONE_GROUP) {
			/*
			 * Test pi group name with request
			 */
			if (mar_name_compare (&pi->group, &req_lib_cpg_iterationinitialize->group_name) != 0)
				/*
				 * Not same -> don't add
				 */
				continue ;
		}

		new_pi = malloc (sizeof (struct process_info));
		if (!new_pi) {
			log_printf(LOGSYS_LEVEL_WARNING, "Unable to allocate process_info struct");

			error = CS_ERR_NO_MEMORY;

			goto error_put_destroy;
		}

		memcpy (new_pi, pi, sizeof (struct process_info));
		list_init (&new_pi->list);

		if (req_lib_cpg_iterationinitialize->iteration_type == CPG_ITERATION_NAME_ONLY) {
			/*
			 * pid and nodeid -> undefined
			 */
			new_pi->pid = new_pi->nodeid = 0;
		}

		/*
		 * We will return list "grouped" by "group name", so try to find right place to add
		 */
		for (iter2 = cpg_iteration_instance->items_list_head.next;
		     iter2 != &cpg_iteration_instance->items_list_head;
		     iter2 = iter2->next) {
			 struct process_info *pi2 = list_entry (iter2, struct process_info, list);

			 if (mar_name_compare (&pi2->group, &pi->group) == 0) {
				break;
			 }
		}

		list_add (&new_pi->list, iter2);
	}

	/*
	 * Now we have a full "grouped by" copy of process_info list
	 */

	/*
	 * Add instance to current cpd list
	 */
	list_init (&cpg_iteration_instance->list);
	list_add (&cpg_iteration_instance->list, &cpd->iteration_instance_list_head);

	cpg_iteration_instance->current_pointer = &cpg_iteration_instance->items_list_head;

error_put_destroy:
	hdb_handle_put (&cpg_iteration_handle_t_db, cpg_iteration_handle);
error_destroy:
	if (error != CS_OK) {
		hdb_handle_destroy (&cpg_iteration_handle_t_db, cpg_iteration_handle);
	}

response_send:
	res_lib_cpg_iterationinitialize.header.size = sizeof (res_lib_cpg_iterationinitialize);
	res_lib_cpg_iterationinitialize.header.id = MESSAGE_RES_CPG_ITERATIONINITIALIZE;
	res_lib_cpg_iterationinitialize.header.error = error;
	res_lib_cpg_iterationinitialize.iteration_handle = cpg_iteration_handle;

	api->ipc_response_send (conn, &res_lib_cpg_iterationinitialize,
		sizeof (res_lib_cpg_iterationinitialize));
}

static void message_handler_req_lib_cpg_iteration_next (
	void *conn,
	const void *message)
{
	const struct req_lib_cpg_iterationnext *req_lib_cpg_iterationnext = message;
	struct res_lib_cpg_iterationnext res_lib_cpg_iterationnext;
	struct cpg_iteration_instance *cpg_iteration_instance;
	cs_error_t error = CS_OK;
	int res;
	struct process_info *pi;

	log_printf (LOGSYS_LEVEL_DEBUG, "cpg iteration next\n");

	res = hdb_handle_get (&cpg_iteration_handle_t_db,
			req_lib_cpg_iterationnext->iteration_handle,
			(void *)&cpg_iteration_instance);

	if (res != 0) {
		error = CS_ERR_LIBRARY;
		goto error_exit;
	}

	assert (cpg_iteration_instance);

	cpg_iteration_instance->current_pointer = cpg_iteration_instance->current_pointer->next;

	if (cpg_iteration_instance->current_pointer == &cpg_iteration_instance->items_list_head) {
		error = CS_ERR_NO_SECTIONS;
		goto error_put;
	}

	pi = list_entry (cpg_iteration_instance->current_pointer, struct process_info, list);

	/*
	 * Copy iteration data
	 */
	res_lib_cpg_iterationnext.description.nodeid = pi->nodeid;
	res_lib_cpg_iterationnext.description.pid = pi->pid;
	memcpy (&res_lib_cpg_iterationnext.description.group,
			&pi->group,
			sizeof (mar_cpg_name_t));

error_put:
	hdb_handle_put (&cpg_iteration_handle_t_db, req_lib_cpg_iterationnext->iteration_handle);
error_exit:
	res_lib_cpg_iterationnext.header.size = sizeof (res_lib_cpg_iterationnext);
	res_lib_cpg_iterationnext.header.id = MESSAGE_RES_CPG_ITERATIONNEXT;
	res_lib_cpg_iterationnext.header.error = error;

	api->ipc_response_send (conn, &res_lib_cpg_iterationnext,
		sizeof (res_lib_cpg_iterationnext));
}

static void message_handler_req_lib_cpg_iteration_finalize (
	void *conn,
	const void *message)
{
	const struct req_lib_cpg_iterationfinalize *req_lib_cpg_iterationfinalize = message;
	struct res_lib_cpg_iterationfinalize res_lib_cpg_iterationfinalize;
	struct cpg_iteration_instance *cpg_iteration_instance;
	cs_error_t error = CS_OK;
	int res;

	log_printf (LOGSYS_LEVEL_DEBUG, "cpg iteration finalize\n");

	res = hdb_handle_get (&cpg_iteration_handle_t_db,
			req_lib_cpg_iterationfinalize->iteration_handle,
			(void *)&cpg_iteration_instance);

	if (res != 0) {
		error = CS_ERR_LIBRARY;
		goto error_exit;
	}

	assert (cpg_iteration_instance);

	cpg_iteration_instance_finalize (cpg_iteration_instance);
	hdb_handle_put (&cpg_iteration_handle_t_db, cpg_iteration_instance->handle);

error_exit:
	res_lib_cpg_iterationfinalize.header.size = sizeof (res_lib_cpg_iterationfinalize);
	res_lib_cpg_iterationfinalize.header.id = MESSAGE_RES_CPG_ITERATIONFINALIZE;
	res_lib_cpg_iterationfinalize.header.error = error;

	api->ipc_response_send (conn, &res_lib_cpg_iterationfinalize,
		sizeof (res_lib_cpg_iterationfinalize));
}