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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 ap-
       plication 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.

       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(3),	  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 interrupted	by a signal

       CS_ERR_NOT_SUPPORTED The	requested protocol/functionality not supported

       CS_ERR_MESSAGE_ERROR Incorrect auth message received

       CS_ERR_NO_MEMORY	Not enough memory to complete the requested task

corosync Man Page		  2004-08-31		     CPG_INITIALIZE(3)


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