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
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
/*++
/* NAME
/* master_wakeup 3
/* SUMMARY
/* Postfix master - start/stop service wakeup timers
/* SYNOPSIS
/* #include "master.h"
/*
/* void master_wakeup_init(serv)
/* MASTER_SERV *serv;
/*
/* void master_wakeup_cleanup(serv)
/* MASTER_SERV *serv;
/* DESCRIPTION
/* This module implements automatic service wakeup. In order to
/* wakeup a service, a wakeup trigger is sent to the corresponding
/* service port or FIFO, and a timer is started to repeat this sequence
/* after a configurable amount of time.
/*
/* master_wakeup_init() wakes up the named service. No wakeup
/* is done or scheduled when a zero wakeup time is given, or when
/* the service has been throttled in the mean time.
/* It is OK to call master_wakeup_init() while a timer is already
/* running for the named service. The effect is to restart the
/* wakeup timer.
/*
/* master_wakeup_cleanup() cancels the wakeup timer for the named
/* service. It is an error to disable a service while it still has
/* an active wakeup timer (doing so would cause a dangling reference
/* to a non-existent service).
/* It is OK to call master_wakeup_cleanup() even when no timer is
/* active for the named service.
/* DIAGNOSTICS
/* BUGS
/* SEE ALSO
/* inet_trigger(3), internet-domain client
/* unix_trigger(3), unix-domain client
/* fifo_trigger(3), fifo client
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*--*/
/* System library. */
#include <sys_defs.h>
#include <unistd.h>
#include <string.h>
/* Utility library. */
#include <msg.h>
#include <trigger.h>
#include <events.h>
/* Global library. */
#include <mail_proto.h> /* triggers */
/* Application-specific. */
#include "mail_server.h"
#include "master.h"
/* master_wakeup_timer_event - wakeup event handler */
static void master_wakeup_timer_event(int unused_event, char *context)
{
char *myname = "master_wakeup_timer_event";
MASTER_SERV *serv = (MASTER_SERV *) context;
int status;
static char wakeup = TRIGGER_REQ_WAKEUP;
/*
* Don't wakeup services whose automatic wakeup feature was turned off in
* the mean time.
*/
if (serv->wakeup_time == 0)
return;
/*
* Don't wake up services that are throttled. Find out what transport to
* use. We can't block here so we choose a short timeout.
*/
#define BRIEFLY 1
if (MASTER_THROTTLED(serv) == 0) {
if (msg_verbose)
msg_info("%s: service %s", myname, serv->name);
switch (serv->type) {
case MASTER_SERV_TYPE_INET:
status = inet_trigger(serv->name, &wakeup, sizeof(wakeup), BRIEFLY);
break;
case MASTER_SERV_TYPE_UNIX:
status = LOCAL_TRIGGER(serv->name, &wakeup, sizeof(wakeup), BRIEFLY);
break;
case MASTER_SERV_TYPE_FIFO:
status = fifo_trigger(serv->name, &wakeup, sizeof(wakeup), BRIEFLY);
break;
default:
msg_panic("%s: unknown service type: %d", myname, serv->type);
}
if (status < 0)
msg_warn("%s: service %s: %m", myname, serv->name);
}
/*
* Schedule another wakeup event.
*/
event_request_timer(master_wakeup_timer_event, (char *) serv,
serv->wakeup_time);
}
/* master_wakeup_init - start automatic service wakeup */
void master_wakeup_init(MASTER_SERV *serv)
{
char *myname = "master_wakeup_init";
if (serv->wakeup_time == 0)
return;
if (msg_verbose)
msg_info("%s: service %s time %d",
myname, serv->name, serv->wakeup_time);
master_wakeup_timer_event(0, (char *) serv);
}
/* master_wakeup_cleanup - cancel wakeup timer */
void master_wakeup_cleanup(MASTER_SERV *serv)
{
char *myname = "master_wakeup_cleanup";
/*
* Cleanup, even when the wakeup feature has been turned off. There might
* still be a pending timer. Don't depend on the code that reloads the
* config file to reset the wakeup timer when things change.
*/
if (msg_verbose)
msg_info("%s: service %s", myname, serv->name);
event_cancel_timer(master_wakeup_timer_event, (char *) serv);
}
|
