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CPG_MODEL_INITIALICorosync Cluster Engine Programmer's CPG_MODEL_INITIALIZE(3)

       cpg_model_initialize - Create a new connection to the CPG service

       #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);

       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  connec-
       tion.   The  handle  argument  is  then used in other function calls to
       identify	the connection to be used for communication with the CPG  ser-

       Argument	model is used to explicitly choose set of callbacks and	inter-
       nal parameters. Currently 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.

       The  MODEL_V1  is backwards compatible with original callbacks initial-
       ized by cpg_initialize but new  callback	 cpg_totem_confchg_fn  is  de-

       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 con-
       figuration change occurs, cpg_confchg_fn	is called.  If a delivery of a
       message occurs, cpg_deliver_fn is called.  When totem membership	change
       occurs,	cpg_totem_confchg_fn  is  called.  You can OR CPG_MODEL_V1_DE-
       LIVER_INITIAL_TOTEM_CONF	constant to flags to get callback after	 first
       confchg 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

	      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  increas-
       ing number.

       This  call returns the CS_OK value if successful, otherwise an error is

       The errors are undocumented.

       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_lo-
       cal_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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