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quorum_overview(8) [centos man page]

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

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)

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

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)
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