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.TH QUORUM_TRACKSTART 3 2018-04-24 "corosync Man Page" "Corosync Cluster Engine Programmer's Manual"
.SH NAME
quorum_trackstart \- Enable callbacks notification.
.SH SYNOPSIS
.B #include <corosync/quorum.h>
.sp
.BI "int quorum_trackstart(quorum_handle_t *" handle ", unsigned int " flags ");"
.SH DESCRIPTION
The
.B quorum_trackstart
function is used to enable callbacks notification from the quorum API.
.PP
Every time the voting configuration changes (eg a node joins or leave the cluster)
or the quorum status change, the notification is queued.
.PP
The notification is dispatched via
.B quorum_dispatch()
function that will execute the callback.
.PP
The 
.I flags
argument is defined by one or more of the following values and values can be bitwise-or'd

.nf
#define CS_TRACK_CURRENT      0x01
#define CS_TRACK_CHANGES      0x02
#define CS_TRACK_CHANGES_ONLY 0x04
.fi
.SH RETURN VALUE
This call returns the CS_OK value if successful, otherwise an error is returned.
.PP
.SH ERRORS

.PP

.B CS_ERR_TRY_AGAIN
Resource temporarily unavailable

.B CS_ERR_INVALID_PARAM
Invalid argument

.B CS_ERR_ACCESS
Permission denied

.B CS_ERR_LIBRARY
The connection failed

.B CS_ERR_INTERRUPT
System call inturrupted by a signal

.B CS_ERR_NOT_SUPPORTED
The requested protocol/functuality not supported

.B CS_ERR_MESSAGE_ERROR
Incorrect auth message received

.B CS_ERR_NO_MEMORY
Not enough memory to completed the requested task

.SH "SEE ALSO"
.BR quorum_overview (8),
.BR quorum_initialize (3),
.BR quorum_finalize (3),
.BR quorum_getquorate (3),
.BR quorum_trackstop (3),
.BR quorum_fd_get (3),
.BR quorum_dispatch (3),
.BR quorum_context_set (3),
.BR quorum_context_get (3)
.PP