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+.\"/*
+.\" * Copyright (c) 2006 Red Hat, Inc.
+.\" *
+.\" * All rights reserved.
+.\" *
+.\" * Author: Patrick Caulfield <pcaulfie@redhat.com>
+.\" *
+.\" * This software licensed under BSD license, the text of which follows:
+.\" *
+.\" * Redistribution and use in source and binary forms, with or without
+.\" * modification, are permitted provided that the following conditions are met:
+.\" *
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+.\" *   this list of conditions and the following disclaimer.
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+.\" * - Neither the name of the MontaVista Software, Inc. nor the names of its
+.\" *   contributors may be used to endorse or promote products derived from this
+.\" *   software without specific prior written permission.
+.\" *
+.\" * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+.\" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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+.\" * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+.\" * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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+.\" */
+.TH CPG_JOIN 3 2004-08-31 "corosync Man Page" "Corosync Cluster Engine Programmer's Manual"
+.SH NAME
+cpg_join \- Joins one or more groups in the CPG library
+.SH SYNOPSIS
+.B #include <corosync/cpg.h>
+.sp
+.BI "int cpg_join(cpg_handle_t " handle ", struct cpg_name *" group ");
+.SH DESCRIPTION
+The
+.B cpg_join
+function is used to join one group.  When a group is joined, the
+.B cpg_mcast_joined(3)
+is called internally to multicast to the groups joined in the argument
+.I handle.
+The process will also get notifications of other processes joining
+and leaving the group.
+Messages that are sent to any of the groups joined to the parameter
+.I handle
+will be delivered by
+.B cpg_dispatch(3).
+.PP
+This function may be only be called once for each handle. When a group has been joined
+the process will start to receive callbacks relating to messages sent from members
+of the group or notifications of processes joining or leaving the group.
+.PP
+Note that more than one process on each node can join a CPG group and
+each will receive its own copy of any messages sent using
+.I cpg_mcast_joined()
+and its own confchg callback.
+.PP
+
+The argument
+.I group
+is used to specify the group to join.
+
+
+The
+.I groups
+argument is of the type struct cpg_name which is defined by the structure:
+
+.IP
+.RS
+.ne 18
+.nf
+.ta 4n 30n 33n
+struct cpg_name {
+        int length;
+        char value[128];
+};
+.ta
+.fi
+.RE
+.IP
+.PP
+.PP
+.SH RETURN VALUE
+This call returns the CS_OK value if successful, CS_ERR_INVALID_PARAM if the
+handle is already joined to a group.
+.PP
+.SH ERRORS
+Not all errors are documented.
+.SH "SEE ALSO"
+.BR cpg_overview (3),
+.BR cpg_initialize (3),
+.BR cpg_finalize (3),
+.BR cpg_fd_get (3),
+.BR cpg_dispatch (3),
+.BR cpg_join (3),
+.BR cpg_leave (3),
+.BR cpg_mcast_joined (3),
+.BR cpg_membership_get (3)
+.BR cpg_zcb_alloc (3)
+.BR cpg_zcb_free (3)
+.BR cpg_zcb_mcast_joined (3)
+.BR cpg_context_get (3)
+.BR cpg_context_set (3)
+.BR cpg_local_get (3)
+
+.PP