1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
.\"/*
.\" * Copyright (c) 2009-2010 Red Hat, Inc.
.\" *
.\" * All rights reserved.
.\" *
.\" * Author: Jan Friesse (jfriesse@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:
.\" *
.\" * - Redistributions of source code must retain the above copyright notice,
.\" * this list of conditions and the following disclaimer.
.\" * - Redistributions in binary form must reproduce the above copyright notice,
.\" * this list of conditions and the following disclaimer in the documentation
.\" * and/or other materials provided with the distribution.
.\" * - Neither the name of the Red Hat, 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
.\" * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
.\" * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
.\" * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
.\" * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
.\" * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
.\" * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
.\" * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
.\" * THE POSSIBILITY OF SUCH DAMAGE.
.\" */
.TH "SAM_INITIALIZE" 3 "21/05/2010" "corosync Man Page" "Corosync Cluster Engine Programmer's Manual"
.SH NAME
.P
sam_initialize \- Initialize health checking
.SH SYNOPSIS
.P
\fB#include <corosync/sam.h>\fR
.P
\fBcs_error_t sam_initialize (int\fR \fItime_interval\fR\fB, sam_recovery_policy_t \fIrecovery_policy\fR);\fR
.SH DESCRIPTION
.P
The \fBsam_initialize\fR function is used to initialize health checking of a process.
.P
Application can have only one instance of SAM. This function must be called
before any other of SAM functions. It is recommended to initialize before the
process begins any process initialization.
.P
The \fItime_interval\fR parameter is a timeout in milliseconds before taking
recovery action after having not received a healthcheck.
If \fItime_interval\fR parameter is zero, there is no time limit and no
healthcheck must be sent by the process. In this operational mode, a process
failure will continue to execute the recovery policy.
.P
The \fIrecovery_policy\fR is defined as type:
.nf
typedef enum {
SAM_RECOVERY_POLICY_QUIT = 1,
SAM_RECOVERY_POLICY_RESTART = 2,
SAM_RECOVERY_POLICY_QUORUM = 0x08,
SAM_RECOVERY_POLICY_QUORUM_QUIT = SAM_RECOVERY_POLICY_QUORUM | SAM_RECOVERY_POLICY_QUIT,
SAM_RECOVERY_POLICY_QUORUM_RESTART = SAM_RECOVERY_POLICY_QUORUM | SAM_RECOVERY_POLICY_RESTART,
SAM_RECOVERY_POLICY_CMAP = 0x10,
SAM_RECOVERY_POLICY_CONFDB = 0x10,
} sam_recovery_policy_t;
.fi
.P
where
.TP
SAM_RECOVERY_POLICY_QUIT
on failure, the process will terminate.
.TP
SAM_RECOVERY_POLICY_RESTART
on failure, the process will restart.
.TP
SAM_RECOVERY_POLICY_QUORUM
is not policy. Used only as flag meaning quorum integration
.TP
SAM_RECOVERY_POLICY_QUORUM_QUIT
same as \fISAM_RECOVERY_POLICY_QUIT\fR but \fBsam_start (3)\fR will block until corosync becomes
quorate and process will be terminated if quorum is lost.
.TP
SAM_RECOVERY_POLICY_QUORUM_RESTART
same as \fISAM_RECOVERY_POLICY_RESTART\fR but \fBsam_start (3)\fR will block until corosync becomes
quorate and process will be restarted if quorum is lost.
.TP
SAM_RECOVERY_POLICY_CMAP
is not policy. Used only as flag meaning cmap integration. It can be used with all previous policies.
For backward compatibility, SAM_RECOVERY_POLICY_CONFDB with same meaning as
\fISAM_RECOVERY_POLICY_CMAP\fR is also provided.
.P
To perform event driven healthchecking, \fBsam_register(3)\fR and
\fBsam_start(3)\fR functions must called. Event driven healthchecking causes
the duplicate standby process running the SAM serve rto periodically request
healthchecks from the active process.
.SH RETURN VALUE
.P
This call return CS_OK value if successful, otherwise and error is returned.
.SH ERRORS
.TP
CS_ERR_BAD_HANDLE
can happened in case of double initialization.
.TP
CS_ERR_INVALID_PARAM
\fIrecovery_policy\fR has invalid value.
.SH "SEE ALSO"
.BR sam_register (3),
.BR sam_start (3),
.BR sam_hc_callback_register (3)
|
