1 /* $NetBSD: win32select.c,v 1.1.1.2 2015/01/29 06:37:53 spz Exp $ */
2 /*
3 * Copyright 2007-2012 Niels Provos and Nick Mathewson
4 * Copyright 2000-2007 Niels Provos <provos@citi.umich.edu>
5 * Copyright 2003 Michael A. Davis <mike@datanerds.net>
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #include <winsock2.h>
31 #include <windows.h>
32 #include <sys/types.h>
33 #include <sys/queue.h>
34 #include <limits.h>
35 #include <signal.h>
36 #include <stdio.h>
37 #include <stdlib.h>
38 #include <string.h>
39 #include <errno.h>
40
41 #include "event2/util.h"
42 #include "event2/event-config.h"
43 #include <sys/cdefs.h>
44 __RCSID("$NetBSD: win32select.c,v 1.1.1.2 2015/01/29 06:37:53 spz Exp $");
45 #include "util-internal.h"
46 #include "log-internal.h"
47 #include "event2/event.h"
48 #include "event-internal.h"
49 #include "evmap-internal.h"
50 #include "event2/thread.h"
51 #include "evthread-internal.h"
52
53 #define XFREE(ptr) do { if (ptr) mm_free(ptr); } while (0)
54
55 extern struct event_list timequeue;
56 extern struct event_list addqueue;
57
58 struct win_fd_set {
59 u_int fd_count;
60 SOCKET fd_array[1];
61 };
62
63 /* MSDN says this is required to handle SIGFPE */
64 volatile double SIGFPE_REQ = 0.0f;
65
66 struct idx_info {
67 int read_pos_plus1;
68 int write_pos_plus1;
69 };
70
71 struct win32op {
72 unsigned num_fds_in_fd_sets;
73 int resize_out_sets;
74 struct win_fd_set *readset_in;
75 struct win_fd_set *writeset_in;
76 struct win_fd_set *readset_out;
77 struct win_fd_set *writeset_out;
78 struct win_fd_set *exset_out;
79 unsigned signals_are_broken : 1;
80 };
81
82 static void *win32_init(struct event_base *);
83 static int win32_add(struct event_base *, evutil_socket_t, short old, short events, void *_idx);
84 static int win32_del(struct event_base *, evutil_socket_t, short old, short events, void *_idx);
85 static int win32_dispatch(struct event_base *base, struct timeval *);
86 static void win32_dealloc(struct event_base *);
87
88 struct eventop win32ops = {
89 "win32",
90 win32_init,
91 win32_add,
92 win32_del,
93 win32_dispatch,
94 win32_dealloc,
95 0, /* doesn't need reinit */
96 0, /* No features supported. */
97 sizeof(struct idx_info),
98 };
99
100 #define FD_SET_ALLOC_SIZE(n) ((sizeof(struct win_fd_set) + ((n)-1)*sizeof(SOCKET)))
101
102 static int
grow_fd_sets(struct win32op * op,unsigned new_num_fds)103 grow_fd_sets(struct win32op *op, unsigned new_num_fds)
104 {
105 size_t size;
106
107 EVUTIL_ASSERT(new_num_fds >= op->readset_in->fd_count &&
108 new_num_fds >= op->writeset_in->fd_count);
109 EVUTIL_ASSERT(new_num_fds >= 1);
110
111 size = FD_SET_ALLOC_SIZE(new_num_fds);
112 if (!(op->readset_in = mm_realloc(op->readset_in, size)))
113 return (-1);
114 if (!(op->writeset_in = mm_realloc(op->writeset_in, size)))
115 return (-1);
116 op->resize_out_sets = 1;
117 op->num_fds_in_fd_sets = new_num_fds;
118 return (0);
119 }
120
121 static int
do_fd_set(struct win32op * op,struct idx_info * ent,evutil_socket_t s,int read)122 do_fd_set(struct win32op *op, struct idx_info *ent, evutil_socket_t s, int read)
123 {
124 struct win_fd_set *set = read ? op->readset_in : op->writeset_in;
125 if (read) {
126 if (ent->read_pos_plus1 > 0)
127 return (0);
128 } else {
129 if (ent->write_pos_plus1 > 0)
130 return (0);
131 }
132 if (set->fd_count == op->num_fds_in_fd_sets) {
133 if (grow_fd_sets(op, op->num_fds_in_fd_sets*2))
134 return (-1);
135 /* set pointer will have changed and needs reiniting! */
136 set = read ? op->readset_in : op->writeset_in;
137 }
138 set->fd_array[set->fd_count] = s;
139 if (read)
140 ent->read_pos_plus1 = set->fd_count+1;
141 else
142 ent->write_pos_plus1 = set->fd_count+1;
143 return (set->fd_count++);
144 }
145
146 static int
do_fd_clear(struct event_base * base,struct win32op * op,struct idx_info * ent,int read)147 do_fd_clear(struct event_base *base,
148 struct win32op *op, struct idx_info *ent, int read)
149 {
150 int i;
151 struct win_fd_set *set = read ? op->readset_in : op->writeset_in;
152 if (read) {
153 i = ent->read_pos_plus1 - 1;
154 ent->read_pos_plus1 = 0;
155 } else {
156 i = ent->write_pos_plus1 - 1;
157 ent->write_pos_plus1 = 0;
158 }
159 if (i < 0)
160 return (0);
161 if (--set->fd_count != (unsigned)i) {
162 struct idx_info *ent2;
163 SOCKET s2;
164 s2 = set->fd_array[i] = set->fd_array[set->fd_count];
165
166 ent2 = evmap_io_get_fdinfo(&base->io, s2);
167
168 if (!ent2) /* This indicates a bug. */
169 return (0);
170 if (read)
171 ent2->read_pos_plus1 = i+1;
172 else
173 ent2->write_pos_plus1 = i+1;
174 }
175 return (0);
176 }
177
178 #define NEVENT 32
179 void *
win32_init(struct event_base * _base)180 win32_init(struct event_base *_base)
181 {
182 struct win32op *winop;
183 size_t size;
184 if (!(winop = mm_calloc(1, sizeof(struct win32op))))
185 return NULL;
186 winop->num_fds_in_fd_sets = NEVENT;
187 size = FD_SET_ALLOC_SIZE(NEVENT);
188 if (!(winop->readset_in = mm_malloc(size)))
189 goto err;
190 if (!(winop->writeset_in = mm_malloc(size)))
191 goto err;
192 if (!(winop->readset_out = mm_malloc(size)))
193 goto err;
194 if (!(winop->writeset_out = mm_malloc(size)))
195 goto err;
196 if (!(winop->exset_out = mm_malloc(size)))
197 goto err;
198 winop->readset_in->fd_count = winop->writeset_in->fd_count = 0;
199 winop->readset_out->fd_count = winop->writeset_out->fd_count
200 = winop->exset_out->fd_count = 0;
201
202 if (evsig_init(_base) < 0)
203 winop->signals_are_broken = 1;
204
205 return (winop);
206 err:
207 XFREE(winop->readset_in);
208 XFREE(winop->writeset_in);
209 XFREE(winop->readset_out);
210 XFREE(winop->writeset_out);
211 XFREE(winop->exset_out);
212 XFREE(winop);
213 return (NULL);
214 }
215
216 int
win32_add(struct event_base * base,evutil_socket_t fd,short old,short events,void * _idx)217 win32_add(struct event_base *base, evutil_socket_t fd,
218 short old, short events, void *_idx)
219 {
220 struct win32op *win32op = base->evbase;
221 struct idx_info *idx = _idx;
222
223 if ((events & EV_SIGNAL) && win32op->signals_are_broken)
224 return (-1);
225
226 if (!(events & (EV_READ|EV_WRITE)))
227 return (0);
228
229 event_debug(("%s: adding event for %d", __func__, (int)fd));
230 if (events & EV_READ) {
231 if (do_fd_set(win32op, idx, fd, 1)<0)
232 return (-1);
233 }
234 if (events & EV_WRITE) {
235 if (do_fd_set(win32op, idx, fd, 0)<0)
236 return (-1);
237 }
238 return (0);
239 }
240
241 int
win32_del(struct event_base * base,evutil_socket_t fd,short old,short events,void * _idx)242 win32_del(struct event_base *base, evutil_socket_t fd, short old, short events,
243 void *_idx)
244 {
245 struct win32op *win32op = base->evbase;
246 struct idx_info *idx = _idx;
247
248 event_debug(("%s: Removing event for "EV_SOCK_FMT,
249 __func__, EV_SOCK_ARG(fd)));
250 if (events & EV_READ)
251 do_fd_clear(base, win32op, idx, 1);
252 if (events & EV_WRITE)
253 do_fd_clear(base, win32op, idx, 0);
254
255 return 0;
256 }
257
258 static void
fd_set_copy(struct win_fd_set * out,const struct win_fd_set * in)259 fd_set_copy(struct win_fd_set *out, const struct win_fd_set *in)
260 {
261 out->fd_count = in->fd_count;
262 memcpy(out->fd_array, in->fd_array, in->fd_count * (sizeof(SOCKET)));
263 }
264
265 /*
266 static void dump_fd_set(struct win_fd_set *s)
267 {
268 unsigned int i;
269 printf("[ ");
270 for(i=0;i<s->fd_count;++i)
271 printf("%d ",(int)s->fd_array[i]);
272 printf("]\n");
273 }
274 */
275
276 int
win32_dispatch(struct event_base * base,struct timeval * tv)277 win32_dispatch(struct event_base *base, struct timeval *tv)
278 {
279 struct win32op *win32op = base->evbase;
280 int res = 0;
281 unsigned j, i;
282 int fd_count;
283 SOCKET s;
284
285 if (win32op->resize_out_sets) {
286 size_t size = FD_SET_ALLOC_SIZE(win32op->num_fds_in_fd_sets);
287 if (!(win32op->readset_out = mm_realloc(win32op->readset_out, size)))
288 return (-1);
289 if (!(win32op->exset_out = mm_realloc(win32op->exset_out, size)))
290 return (-1);
291 if (!(win32op->writeset_out = mm_realloc(win32op->writeset_out, size)))
292 return (-1);
293 win32op->resize_out_sets = 0;
294 }
295
296 fd_set_copy(win32op->readset_out, win32op->readset_in);
297 fd_set_copy(win32op->exset_out, win32op->writeset_in);
298 fd_set_copy(win32op->writeset_out, win32op->writeset_in);
299
300 fd_count =
301 (win32op->readset_out->fd_count > win32op->writeset_out->fd_count) ?
302 win32op->readset_out->fd_count : win32op->writeset_out->fd_count;
303
304 if (!fd_count) {
305 long msec = tv ? evutil_tv_to_msec(tv) : LONG_MAX;
306 /* Sleep's DWORD argument is unsigned long */
307 if (msec < 0)
308 msec = LONG_MAX;
309 /* Windows doesn't like you to call select() with no sockets */
310 Sleep(msec);
311 return (0);
312 }
313
314 EVBASE_RELEASE_LOCK(base, th_base_lock);
315
316 res = select(fd_count,
317 (struct fd_set*)win32op->readset_out,
318 (struct fd_set*)win32op->writeset_out,
319 (struct fd_set*)win32op->exset_out, tv);
320
321 EVBASE_ACQUIRE_LOCK(base, th_base_lock);
322
323 event_debug(("%s: select returned %d", __func__, res));
324
325 if (res <= 0) {
326 return res;
327 }
328
329 if (win32op->readset_out->fd_count) {
330 i = rand() % win32op->readset_out->fd_count;
331 for (j=0; j<win32op->readset_out->fd_count; ++j) {
332 if (++i >= win32op->readset_out->fd_count)
333 i = 0;
334 s = win32op->readset_out->fd_array[i];
335 evmap_io_active(base, s, EV_READ);
336 }
337 }
338 if (win32op->exset_out->fd_count) {
339 i = rand() % win32op->exset_out->fd_count;
340 for (j=0; j<win32op->exset_out->fd_count; ++j) {
341 if (++i >= win32op->exset_out->fd_count)
342 i = 0;
343 s = win32op->exset_out->fd_array[i];
344 evmap_io_active(base, s, EV_WRITE);
345 }
346 }
347 if (win32op->writeset_out->fd_count) {
348 SOCKET s;
349 i = rand() % win32op->writeset_out->fd_count;
350 for (j=0; j<win32op->writeset_out->fd_count; ++j) {
351 if (++i >= win32op->writeset_out->fd_count)
352 i = 0;
353 s = win32op->writeset_out->fd_array[i];
354 evmap_io_active(base, s, EV_WRITE);
355 }
356 }
357 return (0);
358 }
359
360 void
win32_dealloc(struct event_base * _base)361 win32_dealloc(struct event_base *_base)
362 {
363 struct win32op *win32op = _base->evbase;
364
365 evsig_dealloc(_base);
366 if (win32op->readset_in)
367 mm_free(win32op->readset_in);
368 if (win32op->writeset_in)
369 mm_free(win32op->writeset_in);
370 if (win32op->readset_out)
371 mm_free(win32op->readset_out);
372 if (win32op->writeset_out)
373 mm_free(win32op->writeset_out);
374 if (win32op->exset_out)
375 mm_free(win32op->exset_out);
376 /* XXXXX free the tree. */
377
378 memset(win32op, 0, sizeof(*win32op));
379 mm_free(win32op);
380 }
381