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

NAME

       cpg_join - Joins one or more groups in the CPG library

SYNOPSIS

       #include <corosync/cpg.h>

       int cpg_join(cpg_handle_t handle, struct cpg_name *group);

DESCRIPTION

       The  cpg_join function is used to join one group.  When a group is joined, the cpg_mcast_joined(3) is called internally to multicast to the
       groups joined in the argument handle.  The process will also get notifications of other processes joining and leaving the group.   Messages
       that are sent to any of the groups joined to the parameter handle will be delivered by cpg_dispatch(3).

       This function may be only be called once for each handle. When a group has been joined the process will start to receive callbacks relating
       to messages sent from members of the group or notifications of processes joining or leaving the group.

       Note that more than one process on each node can join a CPG group  and  each  will  receive  its  own  copy  of	any  messages  sent  using
       cpg_mcast_joined() and its own confchg callback.

       The argument group is used to specify the group to join.

       The groups argument is of the type struct cpg_name which is defined by the structure:

	      struct cpg_name {
		      int length;
		      char value[128];
	      };

RETURN VALUE

       This call returns the CPG_OK value if successful, CPG_ERR_INVALID_PARAM if the handle is already joined to a group.

ERRORS

       Not all errors are documented.

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)

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