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163 lines
4.8 KiB
Groff
163 lines
4.8 KiB
Groff
.\"/*
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.\" * Copyright (c) 2006 Red Hat, Inc.
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.\" *
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.\" * All rights reserved.
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.\" *
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.\" * Author: Patrick Caulfield <pcaulfie@redhat.com>
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.\" *
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.\" * This software licensed under BSD license, the text of which follows:
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.\" *
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.\" * Redistribution and use in source and binary forms, with or without
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.\" * modification, are permitted provided that the following conditions are met:
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.\" *
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.\" * - Redistributions of source code must retain the above copyright notice,
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.\" * this list of conditions and the following disclaimer.
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.\" * - Redistributions in binary form must reproduce the above copyright notice,
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.\" * this list of conditions and the following disclaimer in the documentation
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.\" * and/or other materials provided with the distribution.
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.\" * - Neither the name of the MontaVista Software, Inc. nor the names of its
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.\" * contributors may be used to endorse or promote products derived from this
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.\" * software without specific prior written permission.
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.\" *
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.\" * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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.\" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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.\" * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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.\" * THE POSSIBILITY OF SUCH DAMAGE.
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.\" */
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.TH CPG_INITIALIZE 3 2004-08-31 "openais Man Page" "Openais Programmer's Manual"
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.SH NAME
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evs_initialize \- Create a new connection to the CPG service
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.SH SYNOPSIS
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.B #include <openais/cpg.h>
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.sp
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.BI "int cpg_initialize(evs_handle_t *" handle ", cpg_callbacks_t *" callbacks ");
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.SH DESCRIPTION
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The
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.B cpg_initialize
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function is used to initialize a connection to the closed process groups API.
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.PP
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Each application may have several connections to the CPG API. Each application
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uses the
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.I handle
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argument to uniquely identify the connection. The
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.I handle
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argument is then used in other function calls to identify the connection to be used
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for communication with the CPG service.
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.PP
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Every time an CPG event occurs within the joined group, one of the callbacks specified by the argument
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.I callbacks
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is called. The callback functions are described by the following type definitions:
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.PP
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.PP
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.IP
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.RS
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.ne 18
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.nf
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.ta 4n 20n 32n
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typedef void (*cpg_deliver_fn_t) (
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cpg_handle_t handle,
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struct cpg_name *group_name,
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uint32_t nodeid,
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uint32_t pid,
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void *msg,
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int msg_len);
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typedef void (*cpg_confchg_fn_t) (
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cpg_handle_t handle,
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struct cpg_name *group_name,
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struct cpg_address *member_list, int member_list_entries,
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struct cpg_address *left_list, int left_list_entries,
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struct cpg_address *joined_list, int joined_list_entries);
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.ta
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.fi
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.RE
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.IP
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.PP
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.PP
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The
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.I callbacks
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argument is of the type:
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.IP
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.RS
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.ne 18
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.nf
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.PP
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typedef struct {
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cpg_deliver_fn_t cpg_deliver_fn;
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cpg_confchg_fn_t cpg_confchg_fn;
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} cpg_callbacks_t;
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.ta
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.fi
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.RE
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.IP
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.PP
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When a configuration change occurs or a message is to be delivered one of the callbacks
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is called from the
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.B cpg_dispatch()
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function. If a configuration change occurs,
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.I cpg_confchg_fn
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is called. If a delivery of a message occurs,
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.I cpg_deliver_fn
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is called.
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The
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.I cpg_address
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structure is defined
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.IP
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.RS
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.ne 18
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.nf
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.PP
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struct cpg_address {
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unsigned int nodeid;
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unsigned int pid;
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unsigned int reason;
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};
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.ta
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.fi
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.RE
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.IP
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.PP
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where nodeid is a 32 bit unique node identifier, pid is the process ID of the process that has joined/left the group
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or sent the message, and reason is an integer code indicating why the node join/left the group.
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.PP
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.IP
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.RS
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.ne 18
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.nf
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.PP
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CPG_REASON_JOIN - the process joined a group using cpg_join().
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CPG_REASON_LEAVE - the process left a group using cpg_leave()
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CPG_REASON_NODEDOWN - the process left a group because the node left the cluster.
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CPG_REASON_NODEUP - the process joined a group because it was already a member of a group on a node that has just joined the cluster
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CPG_REASON_PROCDOWN - the process left a group without calling cpg_leave()
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.ta
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.fi
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.RE
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.IP
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.PP
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.SH RETURN VALUE
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This call returns the CPG_OK value if successful, otherwise an error is returned.
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.PP
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.SH ERRORS
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The errors are undocumented.
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.SH "SEE ALSO"
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.BR cpg_overview (8),
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.BR cpg_finalize (3),
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.BR cpg_fd_get (3),
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.BR cpg_dispatch (3),
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.BR cpg_join (3),
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.BR cpg_leave (3),
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.BR cpg_mcast_joined (3),
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.BR cpg_mmembership_get (3)
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.PP
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