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
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
|
/* $OpenBSD: select.c,v 1.6 2004/04/28 06:53:12 brad Exp $ */
/*
* Copyright 2000-2002 Niels Provos <provos@citi.umich.edu>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/types.h>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#else
#include <sys/_time.h>
#endif
#include <sys/queue.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <err.h>
#ifdef USE_LOG
#include "log.h"
#else
#define LOG_DBG(x)
#define log_error(x) perror(x)
#endif
#include "event.h"
#include "evsignal.h"
extern struct event_list eventqueue;
#ifndef howmany
#define howmany(x, y) (((x)+((y)-1))/(y))
#endif
extern volatile sig_atomic_t evsignal_caught;
struct selectop {
int event_fds; /* Highest fd in fd set */
int event_fdsz;
fd_set *event_readset;
fd_set *event_writeset;
sigset_t evsigmask;
} sop;
void *select_init (void);
int select_add (void *, struct event *);
int select_del (void *, struct event *);
int select_recalc (void *, int);
int select_dispatch (void *, struct timeval *);
const struct eventop selectops = {
"select",
select_init,
select_add,
select_del,
select_recalc,
select_dispatch
};
void *
select_init(void)
{
/* Disable kqueue when this environment variable is set */
if (!issetugid() && getenv("EVENT_NOSELECT"))
return (NULL);
memset(&sop, 0, sizeof(sop));
evsignal_init(&sop.evsigmask);
return (&sop);
}
/*
* Called with the highest fd that we know about. If it is 0, completely
* recalculate everything.
*/
int
select_recalc(void *arg, int max)
{
struct selectop *sop = arg;
fd_set *readset, *writeset;
struct event *ev;
int fdsz;
if (sop->event_fds < max)
sop->event_fds = max;
if (!sop->event_fds) {
TAILQ_FOREACH(ev, &eventqueue, ev_next)
if (ev->ev_fd > sop->event_fds)
sop->event_fds = ev->ev_fd;
}
fdsz = howmany(sop->event_fds + 1, NFDBITS) * sizeof(fd_mask);
if (fdsz > sop->event_fdsz) {
if ((readset = realloc(sop->event_readset, fdsz)) == NULL) {
log_error("malloc");
return (-1);
}
if ((writeset = realloc(sop->event_writeset, fdsz)) == NULL) {
log_error("malloc");
free(readset);
return (-1);
}
memset((char *)readset + sop->event_fdsz, 0,
fdsz - sop->event_fdsz);
memset((char *)writeset + sop->event_fdsz, 0,
fdsz - sop->event_fdsz);
sop->event_readset = readset;
sop->event_writeset = writeset;
sop->event_fdsz = fdsz;
}
return (evsignal_recalc(&sop->evsigmask));
}
int
select_dispatch(void *arg, struct timeval *tv)
{
int maxfd, res;
struct event *ev, *next;
struct selectop *sop = arg;
memset(sop->event_readset, 0, sop->event_fdsz);
memset(sop->event_writeset, 0, sop->event_fdsz);
TAILQ_FOREACH(ev, &eventqueue, ev_next) {
if (ev->ev_events & EV_WRITE)
FD_SET(ev->ev_fd, sop->event_writeset);
if (ev->ev_events & EV_READ)
FD_SET(ev->ev_fd, sop->event_readset);
}
if (evsignal_deliver(&sop->evsigmask) == -1)
return (-1);
res = select(sop->event_fds + 1, sop->event_readset,
sop->event_writeset, NULL, tv);
if (evsignal_recalc(&sop->evsigmask) == -1)
return (-1);
if (res == -1) {
if (errno != EINTR) {
log_error("select");
return (-1);
}
evsignal_process();
return (0);
} else if (evsignal_caught)
evsignal_process();
LOG_DBG((LOG_MISC, 80, "%s: select reports %d", __func__, res));
maxfd = 0;
for (ev = TAILQ_FIRST(&eventqueue); ev != NULL; ev = next) {
next = TAILQ_NEXT(ev, ev_next);
res = 0;
if (FD_ISSET(ev->ev_fd, sop->event_readset))
res |= EV_READ;
if (FD_ISSET(ev->ev_fd, sop->event_writeset))
res |= EV_WRITE;
res &= ev->ev_events;
if (res) {
if (!(ev->ev_events & EV_PERSIST))
event_del(ev);
event_active(ev, res, 1);
} else if (ev->ev_fd > maxfd)
maxfd = ev->ev_fd;
}
sop->event_fds = maxfd;
return (0);
}
int
select_add(void *arg, struct event *ev)
{
struct selectop *sop = arg;
if (ev->ev_events & EV_SIGNAL)
return (evsignal_add(&sop->evsigmask, ev));
/*
* Keep track of the highest fd, so that we can calculate the size
* of the fd_sets for select(2)
*/
if (sop->event_fds < ev->ev_fd)
sop->event_fds = ev->ev_fd;
return (0);
}
/*
* Nothing to be done here.
*/
int
select_del(void *arg, struct event *ev)
{
struct selectop *sop = arg;
if (!(ev->ev_events & EV_SIGNAL))
return (0);
return (evsignal_del(&sop->evsigmask, ev));
}
|
