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 connection. The handle argument is then used in other function calls to identify the connection to be used for communication with the EVS service.

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 configuration 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.