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CPG_INITIALIZE(3)	   Corosync Cluster Engine Programmer's Manual		CPG_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 connection.  The handle argument is then used  in
       other  function calls to identify the connection to be used for communication with the CPG

       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 configuration 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 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()

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

       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_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			    2004-08-31				CPG_INITIALIZE(3)
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