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