1 /*
2 * Copyright 2007-2012 Niels Provos and Nick Mathewson
3 * Copyright 2000-2007 Niels Provos <provos@citi.umich.edu>
4 * Copyright 2003 Michael A. Davis <mike@datanerds.net>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28 #include "event2/event-config.h"
29 #include "evconfig-private.h"
30
31 #ifdef _WIN32
32
33 #include <winsock2.h>
34 #include <windows.h>
35 #include <sys/types.h>
36 #include <sys/queue.h>
37 #include <limits.h>
38 #include <signal.h>
39 #include <stdio.h>
40 #include <stdlib.h>
41 #include <string.h>
42 #include <errno.h>
43
44 #include "event2/util.h"
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 #include "time-internal.h"
53
54 #define XFREE(ptr) do { if (ptr) mm_free(ptr); } while (0)
55
56 extern struct event_list timequeue;
57 extern struct event_list addqueue;
58
59 struct win_fd_set {
60 unsigned int fd_count;
61 SOCKET fd_array[1];
62 };
63
64 /* MSDN says this is required to handle SIGFPE */
65 volatile double SIGFPE_REQ = 0.0f;
66
67 struct idx_info {
68 int read_pos_plus1;
69 int write_pos_plus1;
70 };
71
72 struct win32op {
73 unsigned num_fds_in_fd_sets;
74 int resize_out_sets;
75 struct win_fd_set *readset_in;
76 struct win_fd_set *writeset_in;
77 struct win_fd_set *readset_out;
78 struct win_fd_set *writeset_out;
79 struct win_fd_set *exset_out;
80 unsigned signals_are_broken : 1;
81 };
82
83 static void *win32_init(struct event_base *);
84 static int win32_add(struct event_base *, evutil_socket_t, short old, short events, void *idx_);
85 static int win32_del(struct event_base *, evutil_socket_t, short old, short events, void *idx_);
86 static int win32_dispatch(struct event_base *base, struct timeval *);
87 static void win32_dealloc(struct event_base *);
88
89 struct eventop win32ops = {
90 "win32",
91 win32_init,
92 win32_add,
93 win32_del,
94 win32_dispatch,
95 win32_dealloc,
96 0, /* doesn't need reinit */
97 0, /* No features supported. */
98 sizeof(struct idx_info),
99 };
100
101 #define FD_SET_ALLOC_SIZE(n) ((sizeof(struct win_fd_set) + ((n)-1)*sizeof(SOCKET)))
102
103 static int
grow_fd_sets(struct win32op * op,unsigned new_num_fds)104 grow_fd_sets(struct win32op *op, unsigned new_num_fds)
105 {
106 size_t size;
107
108 EVUTIL_ASSERT(new_num_fds >= op->readset_in->fd_count &&
109 new_num_fds >= op->writeset_in->fd_count);
110 EVUTIL_ASSERT(new_num_fds >= 1);
111
112 size = FD_SET_ALLOC_SIZE(new_num_fds);
113 if (!(op->readset_in = mm_realloc(op->readset_in, size)))
114 return (-1);
115 if (!(op->writeset_in = mm_realloc(op->writeset_in, size)))
116 return (-1);
117 op->resize_out_sets = 1;
118 op->num_fds_in_fd_sets = new_num_fds;
119 return (0);
120 }
121
122 static int
do_fd_set(struct win32op * op,struct idx_info * ent,evutil_socket_t s,int read)123 do_fd_set(struct win32op *op, struct idx_info *ent, evutil_socket_t s, int read)
124 {
125 struct win_fd_set *set = read ? op->readset_in : op->writeset_in;
126 if (read) {
127 if (ent->read_pos_plus1 > 0)
128 return (0);
129 } else {
130 if (ent->write_pos_plus1 > 0)
131 return (0);
132 }
133 if (set->fd_count == op->num_fds_in_fd_sets) {
134 if (grow_fd_sets(op, op->num_fds_in_fd_sets*2))
135 return (-1);
136 /* set pointer will have changed and needs reiniting! */
137 set = read ? op->readset_in : op->writeset_in;
138 }
139 set->fd_array[set->fd_count] = s;
140 if (read)
141 ent->read_pos_plus1 = set->fd_count+1;
142 else
143 ent->write_pos_plus1 = set->fd_count+1;
144 return (set->fd_count++);
145 }
146
147 static int
do_fd_clear(struct event_base * base,struct win32op * op,struct idx_info * ent,int read)148 do_fd_clear(struct event_base *base,
149 struct win32op *op, struct idx_info *ent, int read)
150 {
151 int i;
152 struct win_fd_set *set = read ? op->readset_in : op->writeset_in;
153 if (read) {
154 i = ent->read_pos_plus1 - 1;
155 ent->read_pos_plus1 = 0;
156 } else {
157 i = ent->write_pos_plus1 - 1;
158 ent->write_pos_plus1 = 0;
159 }
160 if (i < 0)
161 return (0);
162 if (--set->fd_count != (unsigned)i) {
163 struct idx_info *ent2;
164 SOCKET s2;
165 s2 = set->fd_array[i] = set->fd_array[set->fd_count];
166
167 ent2 = evmap_io_get_fdinfo_(&base->io, s2);
168
169 if (!ent2) /* This indicates a bug. */
170 return (0);
171 if (read)
172 ent2->read_pos_plus1 = i+1;
173 else
174 ent2->write_pos_plus1 = i+1;
175 }
176 return (0);
177 }
178
179 #define NEVENT 32
180 void *
win32_init(struct event_base * base)181 win32_init(struct event_base *base)
182 {
183 struct win32op *winop;
184 size_t size;
185 if (!(winop = mm_calloc(1, sizeof(struct win32op))))
186 return NULL;
187 winop->num_fds_in_fd_sets = NEVENT;
188 size = FD_SET_ALLOC_SIZE(NEVENT);
189 if (!(winop->readset_in = mm_malloc(size)))
190 goto err;
191 if (!(winop->writeset_in = mm_malloc(size)))
192 goto err;
193 if (!(winop->readset_out = mm_malloc(size)))
194 goto err;
195 if (!(winop->writeset_out = mm_malloc(size)))
196 goto err;
197 if (!(winop->exset_out = mm_malloc(size)))
198 goto err;
199 winop->readset_in->fd_count = winop->writeset_in->fd_count = 0;
200 winop->readset_out->fd_count = winop->writeset_out->fd_count
201 = winop->exset_out->fd_count = 0;
202
203 if (evsig_init_(base) < 0)
204 winop->signals_are_broken = 1;
205
206 evutil_weakrand_seed_(&base->weakrand_seed, 0);
207
208 return (winop);
209 err:
210 XFREE(winop->readset_in);
211 XFREE(winop->writeset_in);
212 XFREE(winop->readset_out);
213 XFREE(winop->writeset_out);
214 XFREE(winop->exset_out);
215 XFREE(winop);
216 return (NULL);
217 }
218
219 int
win32_add(struct event_base * base,evutil_socket_t fd,short old,short events,void * idx_)220 win32_add(struct event_base *base, evutil_socket_t fd,
221 short old, short events, void *idx_)
222 {
223 struct win32op *win32op = base->evbase;
224 struct idx_info *idx = idx_;
225
226 if ((events & EV_SIGNAL) && win32op->signals_are_broken)
227 return (-1);
228
229 if (!(events & (EV_READ|EV_WRITE)))
230 return (0);
231
232 event_debug(("%s: adding event for %d", __func__, (int)fd));
233 if (events & EV_READ) {
234 if (do_fd_set(win32op, idx, fd, 1)<0)
235 return (-1);
236 }
237 if (events & EV_WRITE) {
238 if (do_fd_set(win32op, idx, fd, 0)<0)
239 return (-1);
240 }
241 return (0);
242 }
243
244 int
win32_del(struct event_base * base,evutil_socket_t fd,short old,short events,void * idx_)245 win32_del(struct event_base *base, evutil_socket_t fd, short old, short events,
246 void *idx_)
247 {
248 struct win32op *win32op = base->evbase;
249 struct idx_info *idx = idx_;
250
251 event_debug(("%s: Removing event for "EV_SOCK_FMT,
252 __func__, EV_SOCK_ARG(fd)));
253 if (events & EV_READ)
254 do_fd_clear(base, win32op, idx, 1);
255 if (events & EV_WRITE)
256 do_fd_clear(base, win32op, idx, 0);
257
258 return 0;
259 }
260
261 static void
fd_set_copy(struct win_fd_set * out,const struct win_fd_set * in)262 fd_set_copy(struct win_fd_set *out, const struct win_fd_set *in)
263 {
264 out->fd_count = in->fd_count;
265 memcpy(out->fd_array, in->fd_array, in->fd_count * (sizeof(SOCKET)));
266 }
267
268 /*
269 static void dump_fd_set(struct win_fd_set *s)
270 {
271 unsigned int i;
272 printf("[ ");
273 for(i=0;i<s->fd_count;++i)
274 printf("%d ",(int)s->fd_array[i]);
275 printf("]\n");
276 }
277 */
278
279 int
win32_dispatch(struct event_base * base,struct timeval * tv)280 win32_dispatch(struct event_base *base, struct timeval *tv)
281 {
282 struct win32op *win32op = base->evbase;
283 int res = 0;
284 unsigned j, i;
285 int fd_count;
286 SOCKET s;
287
288 if (win32op->resize_out_sets) {
289 size_t size = FD_SET_ALLOC_SIZE(win32op->num_fds_in_fd_sets);
290 if (!(win32op->readset_out = mm_realloc(win32op->readset_out, size)))
291 return (-1);
292 if (!(win32op->exset_out = mm_realloc(win32op->exset_out, size)))
293 return (-1);
294 if (!(win32op->writeset_out = mm_realloc(win32op->writeset_out, size)))
295 return (-1);
296 win32op->resize_out_sets = 0;
297 }
298
299 fd_set_copy(win32op->readset_out, win32op->readset_in);
300 fd_set_copy(win32op->exset_out, win32op->writeset_in);
301 fd_set_copy(win32op->writeset_out, win32op->writeset_in);
302
303 fd_count =
304 (win32op->readset_out->fd_count > win32op->writeset_out->fd_count) ?
305 win32op->readset_out->fd_count : win32op->writeset_out->fd_count;
306
307 if (!fd_count) {
308 long msec = tv ? evutil_tv_to_msec_(tv) : LONG_MAX;
309 /* Sleep's DWORD argument is unsigned long */
310 if (msec < 0)
311 msec = LONG_MAX;
312 /* Windows doesn't like you to call select() with no sockets */
313 Sleep(msec);
314 return (0);
315 }
316
317 EVBASE_RELEASE_LOCK(base, th_base_lock);
318
319 res = select(fd_count,
320 (struct fd_set*)win32op->readset_out,
321 (struct fd_set*)win32op->writeset_out,
322 (struct fd_set*)win32op->exset_out, tv);
323
324 EVBASE_ACQUIRE_LOCK(base, th_base_lock);
325
326 event_debug(("%s: select returned %d", __func__, res));
327
328 if (res <= 0) {
329 return res;
330 }
331
332 if (win32op->readset_out->fd_count) {
333 i = evutil_weakrand_range_(&base->weakrand_seed,
334 win32op->readset_out->fd_count);
335 for (j=0; j<win32op->readset_out->fd_count; ++j) {
336 if (++i >= win32op->readset_out->fd_count)
337 i = 0;
338 s = win32op->readset_out->fd_array[i];
339 evmap_io_active_(base, s, EV_READ);
340 }
341 }
342 if (win32op->exset_out->fd_count) {
343 i = evutil_weakrand_range_(&base->weakrand_seed,
344 win32op->exset_out->fd_count);
345 for (j=0; j<win32op->exset_out->fd_count; ++j) {
346 if (++i >= win32op->exset_out->fd_count)
347 i = 0;
348 s = win32op->exset_out->fd_array[i];
349 evmap_io_active_(base, s, EV_WRITE);
350 }
351 }
352 if (win32op->writeset_out->fd_count) {
353 SOCKET s;
354 i = evutil_weakrand_range_(&base->weakrand_seed,
355 win32op->writeset_out->fd_count);
356 for (j=0; j<win32op->writeset_out->fd_count; ++j) {
357 if (++i >= win32op->writeset_out->fd_count)
358 i = 0;
359 s = win32op->writeset_out->fd_array[i];
360 evmap_io_active_(base, s, EV_WRITE);
361 }
362 }
363 return (0);
364 }
365
366 void
win32_dealloc(struct event_base * base)367 win32_dealloc(struct event_base *base)
368 {
369 struct win32op *win32op = base->evbase;
370
371 evsig_dealloc_(base);
372 if (win32op->readset_in)
373 mm_free(win32op->readset_in);
374 if (win32op->writeset_in)
375 mm_free(win32op->writeset_in);
376 if (win32op->readset_out)
377 mm_free(win32op->readset_out);
378 if (win32op->writeset_out)
379 mm_free(win32op->writeset_out);
380 if (win32op->exset_out)
381 mm_free(win32op->exset_out);
382 /* XXXXX free the tree. */
383
384 memset(win32op, 0, sizeof(*win32op));
385 mm_free(win32op);
386 }
387
388 #endif
389