corosync  3.0.1
exec/quorum.c
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1 /*
2  * Copyright (c) 2008-2012 Red Hat, Inc.
3  *
4  * All rights reserved.
5  *
6  * Author: Christine Caulfield (ccaulfie@redhat.com)
7  *
8  * This software licensed under BSD license, the text of which follows:
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions are met:
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13  * - Redistributions of source code must retain the above copyright notice,
14  * this list of conditions and the following disclaimer.
15  * - Redistributions in binary form must reproduce the above copyright notice,
16  * this list of conditions and the following disclaimer in the documentation
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18  * - Neither the name of the MontaVista Software, Inc. nor the names of its
19  * contributors may be used to endorse or promote products derived from this
20  * software without specific prior written permission.
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22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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34 
35 #include <config.h>
36 
37 #include <sys/types.h>
38 #include <sys/socket.h>
39 #include <sys/un.h>
40 #include <sys/ioctl.h>
41 #include <netinet/in.h>
42 #include <sys/uio.h>
43 #include <unistd.h>
44 #include <fcntl.h>
45 #include <stdlib.h>
46 #include <stdio.h>
47 #include <errno.h>
48 #include <time.h>
49 #include <arpa/inet.h>
50 
51 #include <corosync/corotypes.h>
52 #include <corosync/swab.h>
53 #include <corosync/totem/totempg.h>
54 #include <corosync/totem/totem.h>
55 #include <corosync/logsys.h>
56 
57 #include "quorum.h"
58 #include "main.h"
59 #include "vsf.h"
60 
61 LOGSYS_DECLARE_SUBSYS ("QUORUM");
62 
63 static struct quorum_callin_functions *corosync_quorum_fns = NULL;
64 
66 {
67  if (corosync_quorum_fns) {
68  return corosync_quorum_fns->quorate();
69  }
70  else {
71  return 1;
72  }
73 }
74 
76 {
77  if (corosync_quorum_fns) {
78  return corosync_quorum_fns->register_callback(fn, context);
79  }
80  else {
81  return 0;
82  }
83 }
84 
86 {
87  if (corosync_quorum_fns) {
88  return corosync_quorum_fns->unregister_callback(fn, context);
89  }
90  else {
91  return 0;
92  }
93 }
94 
96 {
97  if (corosync_quorum_fns)
98  return -1;
99 
100  corosync_quorum_fns = fns;
101  return 0;
102 }
103 
104 int quorum_none(void)
105 {
106  if (corosync_quorum_fns)
107  return 0;
108  else
109  return 1;
110 }
int(* quorate)(void)
Definition: coroapi.h:205
int corosync_quorum_is_quorate(void)
Definition: exec/quorum.c:65
int quorum_none(void)
Definition: exec/quorum.c:104
Totem Single Ring Protocol.
int corosync_quorum_initialize(struct quorum_callin_functions *fns)
Definition: exec/quorum.c:95
int corosync_quorum_register_callback(quorum_callback_fn_t fn, void *context)
Definition: exec/quorum.c:75
The quorum_callin_functions struct.
Definition: coroapi.h:204
LOGSYS_DECLARE_SUBSYS("QUORUM")
int corosync_quorum_unregister_callback(quorum_callback_fn_t fn, void *context)
Definition: exec/quorum.c:85
void(* quorum_callback_fn_t)(int quorate, void *context)
The quorum_callback_fn_t callback.
Definition: coroapi.h:199
int(* unregister_callback)(quorum_callback_fn_t callback_fn, void *context)
Definition: coroapi.h:207
int(* register_callback)(quorum_callback_fn_t callback_fn, void *contexxt)
Definition: coroapi.h:206