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

NAME

       cpg_initialize - Create a new connection to the CPG service

SYNOPSIS

       #include <corosync/cpg.h>

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

DESCRIPTION

       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-
       vice.

       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()

RETURN VALUE

       This call returns the CPG_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)

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