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CPG_INITIALIZE(3) Corosync Cluster Engine Programmer's ManualCPG_INITIALIZE(3)

       cpg_initialize -	Create a new connection	to the CPG service

       #include	<corosync/cpg.h>

       int cpg_initialize(cpg_handle_t *handle,	cpg_callbacks_t	*callbacks);

       The  cpg_initialize  function is	used to	initialize a connection	to the
       closed  process	groups	API.   This   function	 is   deprecated   and
       cpg_model_initialize should be used in newly written code.

       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-

       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);

       The callbacks argument is of the	type:

	      typedef struct {
		      cpg_deliver_fn_t cpg_deliver_fn;
		      cpg_confchg_fn_t cpg_confchg_fn;
	      }	cpg_callbacks_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.

       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()

       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		  2004-08-31		     CPG_INITIALIZE(3)


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