quorum_overview(8) [centos man page]

QUORUM_OVERVIEW(8)				    Corosync Cluster Engine Programmer's Manual 				QUORUM_OVERVIEW(8)

NAME

       quorum_overview - Quorum Library Overview

OVERVIEW

       The  quorum library is delivered with the corosync project. It is the external interface to the quorum service. This service is loaded into
       all nodes in a corosync cluster and track the quorum status of a node. In order for quorum service to be useful, a quorum provider must	be
       configured.

       The library provides a mechanism to:

       * Query the quorum status

       * Receive notifications of quorum state changes

BUGS

       No known bugs at the time of writing. The authors are from outerspace. Deal with it.

SEE ALSO

       corosync-quorumtool(8),	corosync.conf(5),  votequorum(5),  quorum_initialize(3),  quorum_finalize(3),  quorum_getquorate(3), quorum_track-
       start(3), quorum_trackstop(3), quorum_fd_get(3), quorum_dispatch(3), quorum_context_set(3), quorum_context_get(3)

corosync Man Page						    2012-02-09							QUORUM_OVERVIEW(8)

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

NAME

       quorum_initialize - Create a new connection to the Quorum service

SYNOPSIS

       #include <corosync/quorum.h>

       int quorum_initialize(quorum_handle_t *handle, quorum_callbacks_t *callbacks, uint32_t *quorum_type);

DESCRIPTION

       The quorum_initialize function is used to initialize a connection to the quorum API.

       Each  application  may have several connections to the quorum API.  Each application uses the handle argument to uniquely identify the con-
       nection.  The handle argument is then used in other function calls to identify the connection to be used for communication with the  quorum
       service.

       Every time the voting configuraton changes (eg a node joins or leave the cluster) or the quorum status change, the callback is called.  The
       callback function is described by the following type definitions:

       typedef void (*quorum_notification_fn_t) (
	       quorum_handle_t handle,
	       uint32_t quorate,
	       uint64_t ring_seq,
	       uint32_t view_list_entries,
	       uint32_t *view_list
	       );

       The callbacks argument is of the type:

       typedef struct {
	       quorum_notification_fn_t quorum_notify_fn;
       } quorum_callbacks_t;

       The quorum_type argument is set to:

       #define QUORUM_FREE     0
       #define QUORUM_SET      1

       QUORUM_FREE value means that no quorum algorithm is loaded and that no callbacks will take place.

       QUORUM_SET value means that one quorum algorithm is configured and that callbacks will take place.

       When a configuration change occurs, the callback is called from the quorum_dispatch() function.

RETURN VALUE

       This call returns the CS_OK value if successful, otherwise an error is returned.

ERRORS

       CS_ERR_TRY_AGAIN Resource temporarily unavailable

       CS_ERR_INVALID_PARAM Invalid argument

       CS_ERR_ACCESS Permission denied

       CS_ERR_LIBRARY The connection failed

       CS_ERR_INTERRUPT System call inturrupted by a signal

       CS_ERR_NOT_SUPPORTED The requested protocol/functuality not supported

       CS_ERR_MESSAGE_ERROR Incorrect auth message received

       CS_ERR_NO_MEMORY Not enough memory to completed the requested task

SEE ALSO

       quorum_overview(8), quorum_finalize(3),	quorum_getquorate(3),  quorum_trackstart(3),  quorum_trackstop(3),  quorum_fd_get(3),  quorum_dis-
       patch(3), quorum_context_set(3), quorum_context_get(3)

corosync Man Page						    2014-06-10						      QUORUM_INITIALIZE(3)