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CPG_MODEL_INITIALIZE(3)    Corosync Cluster Engine Programmer's Manual	  CPG_MODEL_INITIALIZE(3)

NAME
       cpg_model_initialize - Create a new connection to the CPG service

SYNOPSIS
       #include <corosync/cpg.h>

       cs_error_t  cpg_model_initialize(cpg_handle_t *handle, cpg_model_t model, cpg_model_data_t
       *model_data, void *context);

DESCRIPTION
       The cpg_model_initialize function is used to initialize a connection to the closed process
       groups API.

       Each  application may have several connections to the CPG API.  Each  application uses the
       handle argument to uniquely identify the connection.  The handle argument is then used  in
       other  function calls to identify the connection to be used for communication with the CPG
       service.

       Argument model is used to explicitly choose set of callbacks and internal parameters. Cur-
       rently only model CPG_MODEL_V1 is defined.

       Callbacks  and  internal  parameters  are  passed  by  model_data argument. This is casted
       pointer (idea is similar as in sockaddr function) to one of  structures	corresponding  to
       chosen model. Currently only cpg_model_v1_data_t is needed.

MODEL_V1
       The MODEL_V1 is backwards compatible with original callbacks initialized by cpg_initialize
       but new callback cpg_totem_confchg_fn is defined.

       Every time an CPG event occurs within the joined group, one of the callbacks specified  by
       the  argument  callbacks is called.  The callback functions are described by the following
       type definitions:

	      typedef void (*cpg_deliver_fn_t) (
		      cpg_handle_t handle,
		      const struct cpg_name *group_name,
		      uint32_t nodeid,
		      uint32_t pid,
		      const void *msg,
		      size_t msg_len);

	      typedef void (*cpg_confchg_fn_t) (
		      cpg_handle_t handle,
		      const struct cpg_name *group_name,
		      const struct cpg_address *member_list, size_t member_list_entries,
		      const struct cpg_address *left_list, size_t left_list_entries,
		      const struct cpg_address *joined_list, size_t joined_list_entries);

	      typedef void (*cpg_totem_confchg_fn_t) (
		      cpg_handle_t handle,
		      struct cpg_ring_id ring_id,
		      uint32_t member_list_entries,
		      const uint32_t *member_list);

       The cpg_model_v1_data_t structure is defined as:

	      typedef struct {
		      cpg_model_t model;
		      cpg_deliver_fn_t cpg_deliver_fn;
		      cpg_confchg_fn_t cpg_confchg_fn;
		      cpg_totem_confchg_fn_t cpg_totem_confchg_fn;
	      unsigned int flags;
	      } cpg_model_v1_data_t;

       When a configuration change occurs or a message is to be delivered one of the callbacks is
       called from the cpg_dispatch() function.  If a configuration change occurs, cpg_confchg_fn
       is called.  If a delivery of a message occurs, cpg_deliver_fn is called.  When totem  mem-
       bership	   change    occurs,	cpg_totem_confchg_fn	is    called.	 You	can    OR
       CPG_MODEL_V1_DELIVER_INITIAL_TOTEM_CONF constant to flags to get callback after first con-
       fchg event.

       The cpg_address structure is defined

	      struct cpg_address {
		      unsigned int nodeid;
		      unsigned int pid;
		      unsigned int reason;
	      };

       where nodeid is a 32 bit unique node identifier, pid is the process ID of the process that
       has joined/left the group or sent the message, and reason is an	integer  code  indicating
       why the node joined/left the group.

	      CPG_REASON_JOIN	  - the process joined a group using cpg_join().
	      CPG_REASON_LEAVE	  - the process left a group using cpg_leave()
	      CPG_REASON_NODEDOWN - the process left a group because the node left the cluster.
	      CPG_REASON_NODEUP   - the process joined a group because it was already a member of a group on a node that has just joined the cluster
	      CPG_REASON_PROCDOWN - the process left a group without calling cpg_leave()

       The cpg_ring_id structure is defined

	      struct cpg_ring_id {
		      uint32_t nodeid;
		      uint64_t seq;
	      };

       where nodeid is if of node of current Totem leader and seq is increasing number.

RETURN VALUE
       This call returns the CS_OK value if successful, otherwise an error is returned.

ERRORS
       The errors are undocumented.

SEE ALSO
       cpg_overview(8),   cpg_initialize(3),   cpg_finalize(3),  cpg_fd_get(3),  cpg_dispatch(3),
       cpg_join(3),  cpg_leave(3),  cpg_mcast_joined(3),  cpg_membership_get(3)  cpg_zcb_alloc(3)
       cpg_zcb_free(3)	    cpg_zcb_mcast_joined(3)	cpg_context_get(3)     cpg_context_set(3)
       cpg_local_get(3) cpg_model_initialize(3)

       CS_ERR_TRY_AGAIN Resource temporarily unavailable

       CS_ERR_INVALID_PARAM Invalid argument

       CS_ERR_ACCESS Permission denied

       CS_ERR_LIBRARY The connection failed

       CS_ERR_INTERRUPT System call inturrupted by a signal

       CS_ERR_NOT_SUPPORTED The requested protocol/functuality not supported

       CS_ERR_MESSAGE_ERROR Incorrect auth message received

       CS_ERR_NO_MEMORY Not enough memory to completed the requested task

corosync Man Page			    2010-04-07			  CPG_MODEL_INITIALIZE(3)
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