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
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
|
/* dispatch.c
Network input dispatcher... */
/*
* Copyright (c) 2004-2008 by Internet Systems Consortium, Inc. ("ISC")
* Copyright (c) 1995-2003 by Internet Software Consortium
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Internet Systems Consortium, Inc.
* 950 Charter Street
* Redwood City, CA 94063
* <info@isc.org>
* http://www.isc.org/
*
* This software has been written for Internet Systems Consortium
* by Ted Lemon in cooperation with Vixie Enterprises and Nominum, Inc.
* To learn more about Internet Systems Consortium, see
* ``http://www.isc.org/''. To learn more about Vixie Enterprises,
* see ``http://www.vix.com''. To learn more about Nominum, Inc., see
* ``http://www.nominum.com''.
*/
#include "dhcpd.h"
struct timeout *timeouts;
static struct timeout *free_timeouts;
void set_time(TIME t)
{
/* Do any outstanding timeouts. */
if (cur_tv . tv_sec != t) {
cur_tv . tv_sec = t;
cur_tv . tv_usec = 0;
process_outstanding_timeouts ((struct timeval *)0);
}
}
struct timeval *process_outstanding_timeouts (struct timeval *tvp)
{
/* Call any expired timeouts, and then if there's
still a timeout registered, time out the select
call then. */
another:
if (timeouts) {
struct timeout *t;
if ((timeouts -> when . tv_sec < cur_tv . tv_sec) ||
((timeouts -> when . tv_sec == cur_tv . tv_sec) &&
(timeouts -> when . tv_usec <= cur_tv . tv_usec))) {
t = timeouts;
timeouts = timeouts -> next;
(*(t -> func)) (t -> what);
if (t -> unref)
(*t -> unref) (&t -> what, MDL);
t -> next = free_timeouts;
free_timeouts = t;
goto another;
}
if (tvp) {
tvp -> tv_sec = timeouts -> when . tv_sec;
tvp -> tv_usec = timeouts -> when . tv_usec;
}
return tvp;
} else
return (struct timeval *)0;
}
/* Wait for packets to come in using select(). When one does, call
receive_packet to receive the packet and possibly strip hardware
addressing information from it, and then call through the
bootp_packet_handler hook to try to do something with it. */
void dispatch ()
{
struct timeval tv, *tvp;
isc_result_t status;
/* Wait for a packet or a timeout... XXX */
do {
tvp = process_outstanding_timeouts (&tv);
status = omapi_one_dispatch (0, tvp);
} while (status == ISC_R_TIMEDOUT || status == ISC_R_SUCCESS);
log_fatal ("omapi_one_dispatch failed: %s -- exiting.",
isc_result_totext (status));
}
void add_timeout (when, where, what, ref, unref)
struct timeval *when;
void (*where) PROTO ((void *));
void *what;
tvref_t ref;
tvunref_t unref;
{
struct timeout *t, *q;
/* See if this timeout supersedes an existing timeout. */
t = (struct timeout *)0;
for (q = timeouts; q; q = q -> next) {
if ((where == NULL || q -> func == where) &&
q -> what == what) {
if (t)
t -> next = q -> next;
else
timeouts = q -> next;
break;
}
t = q;
}
/* If we didn't supersede a timeout, allocate a timeout
structure now. */
if (!q) {
if (free_timeouts) {
q = free_timeouts;
free_timeouts = q -> next;
} else {
q = ((struct timeout *)
dmalloc (sizeof (struct timeout), MDL));
if (!q)
log_fatal ("add_timeout: no memory!");
}
memset (q, 0, sizeof *q);
q -> func = where;
q -> ref = ref;
q -> unref = unref;
if (q -> ref)
(*q -> ref)(&q -> what, what, MDL);
else
q -> what = what;
}
q -> when . tv_sec = when -> tv_sec;
q -> when . tv_usec = when -> tv_usec;
/* Now sort this timeout into the timeout list. */
/* Beginning of list? */
if (!timeouts || (timeouts -> when . tv_sec > q -> when . tv_sec) ||
((timeouts -> when . tv_sec == q -> when . tv_sec) &&
(timeouts -> when . tv_usec > q -> when . tv_usec))) {
q -> next = timeouts;
timeouts = q;
return;
}
/* Middle of list? */
for (t = timeouts; t -> next; t = t -> next) {
if ((t -> next -> when . tv_sec > q -> when . tv_sec) ||
((t -> next -> when . tv_sec == q -> when . tv_sec) &&
(t -> next -> when . tv_usec > q -> when . tv_usec))) {
q -> next = t -> next;
t -> next = q;
return;
}
}
/* End of list. */
t -> next = q;
q -> next = (struct timeout *)0;
}
void cancel_timeout (where, what)
void (*where) PROTO ((void *));
void *what;
{
struct timeout *t, *q;
/* Look for this timeout on the list, and unlink it if we find it. */
t = (struct timeout *)0;
for (q = timeouts; q; q = q -> next) {
if (q -> func == where && q -> what == what) {
if (t)
t -> next = q -> next;
else
timeouts = q -> next;
break;
}
t = q;
}
/* If we found the timeout, put it on the free list. */
if (q) {
if (q -> unref)
(*q -> unref) (&q -> what, MDL);
q -> next = free_timeouts;
free_timeouts = q;
}
}
#if defined (DEBUG_MEMORY_LEAKAGE_ON_EXIT)
void cancel_all_timeouts ()
{
struct timeout *t, *n;
for (t = timeouts; t; t = n) {
n = t -> next;
if (t -> unref && t -> what)
(*t -> unref) (&t -> what, MDL);
t -> next = free_timeouts;
free_timeouts = t;
}
}
void relinquish_timeouts ()
{
struct timeout *t, *n;
for (t = free_timeouts; t; t = n) {
n = t -> next;
dfree (t, MDL);
}
}
#endif
|
