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EVS_INITIALIZE(3) Corosync Cluster Engine Programmer's ManualEVS_INITIALIZE(3)

NAME
       evs_initialize - Create a new connection to the EVS service

SYNOPSIS
       #include <corosync/evs.h>

       int evs_initialize(evs_handle_t *handle, evs_callbacks_t *callbacks);

DESCRIPTION
       The  evs_initialize  function is used to initialize a connection to the
       extended virtual synchrony API.

       Each application may have several connections to	 the  EVS  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 EVS ser‐
       vice.

       Every time an EVS event occurs, one of the callbacks specified  by  the
       argument	 callbacks is called.  The callback functions are described by
       the following type definitions:

	      typedef void (*evs_deliver_fn_t) (
		  unsigned int nodeid,
		      const void *msg,
		      size_t msg_len);

	      typedef void (*evs_confchg_fn_t) (
		  unsigned int *member_list, size_t member_list_entries,
		  unsigned int *left_list, size_t left_list_entries,
		  unsigned int *joined_list, size_t joined_list_entries);

       The callbacks argument is of the type:

	      typedef struct {
		      evs_deliver_fn_t evs_deliver_fn;
		      evs_confchg_fn_t evs_confchg_fn;
	      } evs_callbacks_t;

       When a configuration change occurs or a message is to be delivered  one
       of the callbacks is called from the evs_dispatch() function.  If a con‐
       figuration change occurs, evs_confchg_fn is called.  If a delivery of a
       message occurs, evs_deliver_fn is called.

RETURN VALUE
       This call returns the EVS_OK value if successful, otherwise an error is
       returned.

ERRORS
       The errors are undocumented.

SEE ALSO
       evs_overview(8),	  evs_finalize(3),   evs_fd_get(3),   evs_dispatch(3),
       evs_join(3),  evs_leave(3),  evs_mcast_joined(3),  evs_mcast_groups(3),
       evs_membership_get(3) evs_context_get(3) evs_context_set(3)

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