The Tor Browser / file comparison
comparison: ipc/chromium/src/third_party/libevent/win32select.c
ipc/chromium/src/third_party/libevent/win32select.c
- branch
- TOR_BUG_9701
- changeset 11
- deefc01c0e14
equal
deleted
inserted
replaced
| -1:000000000000 | 0:611d2fe9cd47 |
|---|---|
| 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 | |
| 29 #include <winsock2.h> | |
| 30 #include <windows.h> | |
| 31 #include <sys/types.h> | |
| 32 #include <sys/queue.h> | |
| 33 #include <limits.h> | |
| 34 #include <signal.h> | |
| 35 #include <stdio.h> | |
| 36 #include <stdlib.h> | |
| 37 #include <string.h> | |
| 38 #include <errno.h> | |
| 39 | |
| 40 #include "event2/util.h" | |
| 41 #include "event2/event-config.h" | |
| 42 #include "util-internal.h" | |
| 43 #include "log-internal.h" | |
| 44 #include "event2/event.h" | |
| 45 #include "event-internal.h" | |
| 46 #include "evmap-internal.h" | |
| 47 #include "event2/thread.h" | |
| 48 #include "evthread-internal.h" | |
| 49 | |
| 50 #define XFREE(ptr) do { if (ptr) mm_free(ptr); } while (0) | |
| 51 | |
| 52 extern struct event_list timequeue; | |
| 53 extern struct event_list addqueue; | |
| 54 | |
| 55 struct win_fd_set { | |
| 56 u_int fd_count; | |
| 57 SOCKET fd_array[1]; | |
| 58 }; | |
| 59 | |
| 60 /* MSDN says this is required to handle SIGFPE */ | |
| 61 volatile double SIGFPE_REQ = 0.0f; | |
| 62 | |
| 63 struct idx_info { | |
| 64 int read_pos_plus1; | |
| 65 int write_pos_plus1; | |
| 66 }; | |
| 67 | |
| 68 struct win32op { | |
| 69 unsigned num_fds_in_fd_sets; | |
| 70 int resize_out_sets; | |
| 71 struct win_fd_set *readset_in; | |
| 72 struct win_fd_set *writeset_in; | |
| 73 struct win_fd_set *readset_out; | |
| 74 struct win_fd_set *writeset_out; | |
| 75 struct win_fd_set *exset_out; | |
| 76 unsigned signals_are_broken : 1; | |
| 77 }; | |
| 78 | |
| 79 static void *win32_init(struct event_base *); | |
| 80 static int win32_add(struct event_base *, evutil_socket_t, short old, short events, void *_idx); | |
| 81 static int win32_del(struct event_base *, evutil_socket_t, short old, short events, void *_idx); | |
| 82 static int win32_dispatch(struct event_base *base, struct timeval *); | |
| 83 static void win32_dealloc(struct event_base *); | |
| 84 | |
| 85 struct eventop win32ops = { | |
| 86 "win32", | |
| 87 win32_init, | |
| 88 win32_add, | |
| 89 win32_del, | |
| 90 win32_dispatch, | |
| 91 win32_dealloc, | |
| 92 0, /* doesn't need reinit */ | |
| 93 0, /* No features supported. */ | |
| 94 sizeof(struct idx_info), | |
| 95 }; | |
| 96 | |
| 97 #define FD_SET_ALLOC_SIZE(n) ((sizeof(struct win_fd_set) + ((n)-1)*sizeof(SOCKET))) | |
| 98 | |
| 99 static int | |
| 100 grow_fd_sets(struct win32op *op, unsigned new_num_fds) | |
| 101 { | |
| 102 size_t size; | |
| 103 | |
| 104 EVUTIL_ASSERT(new_num_fds >= op->readset_in->fd_count && | |
| 105 new_num_fds >= op->writeset_in->fd_count); | |
| 106 EVUTIL_ASSERT(new_num_fds >= 1); | |
| 107 | |
| 108 size = FD_SET_ALLOC_SIZE(new_num_fds); | |
| 109 if (!(op->readset_in = mm_realloc(op->readset_in, size))) | |
| 110 return (-1); | |
| 111 if (!(op->writeset_in = mm_realloc(op->writeset_in, size))) | |
| 112 return (-1); | |
| 113 op->resize_out_sets = 1; | |
| 114 op->num_fds_in_fd_sets = new_num_fds; | |
| 115 return (0); | |
| 116 } | |
| 117 | |
| 118 static int | |
| 119 do_fd_set(struct win32op *op, struct idx_info *ent, evutil_socket_t s, int read) | |
| 120 { | |
| 121 struct win_fd_set *set = read ? op->readset_in : op->writeset_in; | |
| 122 if (read) { | |
| 123 if (ent->read_pos_plus1 > 0) | |
| 124 return (0); | |
| 125 } else { | |
| 126 if (ent->write_pos_plus1 > 0) | |
| 127 return (0); | |
| 128 } | |
| 129 if (set->fd_count == op->num_fds_in_fd_sets) { | |
| 130 if (grow_fd_sets(op, op->num_fds_in_fd_sets*2)) | |
| 131 return (-1); | |
| 132 /* set pointer will have changed and needs reiniting! */ | |
| 133 set = read ? op->readset_in : op->writeset_in; | |
| 134 } | |
| 135 set->fd_array[set->fd_count] = s; | |
| 136 if (read) | |
| 137 ent->read_pos_plus1 = set->fd_count+1; | |
| 138 else | |
| 139 ent->write_pos_plus1 = set->fd_count+1; | |
| 140 return (set->fd_count++); | |
| 141 } | |
| 142 | |
| 143 static int | |
| 144 do_fd_clear(struct event_base *base, | |
| 145 struct win32op *op, struct idx_info *ent, int read) | |
| 146 { | |
| 147 int i; | |
| 148 struct win_fd_set *set = read ? op->readset_in : op->writeset_in; | |
| 149 if (read) { | |
| 150 i = ent->read_pos_plus1 - 1; | |
| 151 ent->read_pos_plus1 = 0; | |
| 152 } else { | |
| 153 i = ent->write_pos_plus1 - 1; | |
| 154 ent->write_pos_plus1 = 0; | |
| 155 } | |
| 156 if (i < 0) | |
| 157 return (0); | |
| 158 if (--set->fd_count != (unsigned)i) { | |
| 159 struct idx_info *ent2; | |
| 160 SOCKET s2; | |
| 161 s2 = set->fd_array[i] = set->fd_array[set->fd_count]; | |
| 162 | |
| 163 ent2 = evmap_io_get_fdinfo(&base->io, s2); | |
| 164 | |
| 165 if (!ent2) /* This indicates a bug. */ | |
| 166 return (0); | |
| 167 if (read) | |
| 168 ent2->read_pos_plus1 = i+1; | |
| 169 else | |
| 170 ent2->write_pos_plus1 = i+1; | |
| 171 } | |
| 172 return (0); | |
| 173 } | |
| 174 | |
| 175 #define NEVENT 32 | |
| 176 void * | |
| 177 win32_init(struct event_base *_base) | |
| 178 { | |
| 179 struct win32op *winop; | |
| 180 size_t size; | |
| 181 if (!(winop = mm_calloc(1, sizeof(struct win32op)))) | |
| 182 return NULL; | |
| 183 winop->num_fds_in_fd_sets = NEVENT; | |
| 184 size = FD_SET_ALLOC_SIZE(NEVENT); | |
| 185 if (!(winop->readset_in = mm_malloc(size))) | |
| 186 goto err; | |
| 187 if (!(winop->writeset_in = mm_malloc(size))) | |
| 188 goto err; | |
| 189 if (!(winop->readset_out = mm_malloc(size))) | |
| 190 goto err; | |
| 191 if (!(winop->writeset_out = mm_malloc(size))) | |
| 192 goto err; | |
| 193 if (!(winop->exset_out = mm_malloc(size))) | |
| 194 goto err; | |
| 195 winop->readset_in->fd_count = winop->writeset_in->fd_count = 0; | |
| 196 winop->readset_out->fd_count = winop->writeset_out->fd_count | |
| 197 = winop->exset_out->fd_count = 0; | |
| 198 | |
| 199 if (evsig_init(_base) < 0) | |
| 200 winop->signals_are_broken = 1; | |
| 201 | |
| 202 return (winop); | |
| 203 err: | |
| 204 XFREE(winop->readset_in); | |
| 205 XFREE(winop->writeset_in); | |
| 206 XFREE(winop->readset_out); | |
| 207 XFREE(winop->writeset_out); | |
| 208 XFREE(winop->exset_out); | |
| 209 XFREE(winop); | |
| 210 return (NULL); | |
| 211 } | |
| 212 | |
| 213 int | |
| 214 win32_add(struct event_base *base, evutil_socket_t fd, | |
| 215 short old, short events, void *_idx) | |
| 216 { | |
| 217 struct win32op *win32op = base->evbase; | |
| 218 struct idx_info *idx = _idx; | |
| 219 | |
| 220 if ((events & EV_SIGNAL) && win32op->signals_are_broken) | |
| 221 return (-1); | |
| 222 | |
| 223 if (!(events & (EV_READ|EV_WRITE))) | |
| 224 return (0); | |
| 225 | |
| 226 event_debug(("%s: adding event for %d", __func__, (int)fd)); | |
| 227 if (events & EV_READ) { | |
| 228 if (do_fd_set(win32op, idx, fd, 1)<0) | |
| 229 return (-1); | |
| 230 } | |
| 231 if (events & EV_WRITE) { | |
| 232 if (do_fd_set(win32op, idx, fd, 0)<0) | |
| 233 return (-1); | |
| 234 } | |
| 235 return (0); | |
| 236 } | |
| 237 | |
| 238 int | |
| 239 win32_del(struct event_base *base, evutil_socket_t fd, short old, short events, | |
| 240 void *_idx) | |
| 241 { | |
| 242 struct win32op *win32op = base->evbase; | |
| 243 struct idx_info *idx = _idx; | |
| 244 | |
| 245 event_debug(("%s: Removing event for "EV_SOCK_FMT, | |
| 246 __func__, EV_SOCK_ARG(fd))); | |
| 247 if (events & EV_READ) | |
| 248 do_fd_clear(base, win32op, idx, 1); | |
| 249 if (events & EV_WRITE) | |
| 250 do_fd_clear(base, win32op, idx, 0); | |
| 251 | |
| 252 return 0; | |
| 253 } | |
| 254 | |
| 255 static void | |
| 256 fd_set_copy(struct win_fd_set *out, const struct win_fd_set *in) | |
| 257 { | |
| 258 out->fd_count = in->fd_count; | |
| 259 memcpy(out->fd_array, in->fd_array, in->fd_count * (sizeof(SOCKET))); | |
| 260 } | |
| 261 | |
| 262 /* | |
| 263 static void dump_fd_set(struct win_fd_set *s) | |
| 264 { | |
| 265 unsigned int i; | |
| 266 printf("[ "); | |
| 267 for(i=0;i<s->fd_count;++i) | |
| 268 printf("%d ",(int)s->fd_array[i]); | |
| 269 printf("]\n"); | |
| 270 } | |
| 271 */ | |
| 272 | |
| 273 int | |
| 274 win32_dispatch(struct event_base *base, struct timeval *tv) | |
| 275 { | |
| 276 struct win32op *win32op = base->evbase; | |
| 277 int res = 0; | |
| 278 unsigned j, i; | |
| 279 int fd_count; | |
| 280 SOCKET s; | |
| 281 | |
| 282 if (win32op->resize_out_sets) { | |
| 283 size_t size = FD_SET_ALLOC_SIZE(win32op->num_fds_in_fd_sets); | |
| 284 if (!(win32op->readset_out = mm_realloc(win32op->readset_out, size))) | |
| 285 return (-1); | |
| 286 if (!(win32op->exset_out = mm_realloc(win32op->exset_out, size))) | |
| 287 return (-1); | |
| 288 if (!(win32op->writeset_out = mm_realloc(win32op->writeset_out, size))) | |
| 289 return (-1); | |
| 290 win32op->resize_out_sets = 0; | |
| 291 } | |
| 292 | |
| 293 fd_set_copy(win32op->readset_out, win32op->readset_in); | |
| 294 fd_set_copy(win32op->exset_out, win32op->writeset_in); | |
| 295 fd_set_copy(win32op->writeset_out, win32op->writeset_in); | |
| 296 | |
| 297 fd_count = | |
| 298 (win32op->readset_out->fd_count > win32op->writeset_out->fd_count) ? | |
| 299 win32op->readset_out->fd_count : win32op->writeset_out->fd_count; | |
| 300 | |
| 301 if (!fd_count) { | |
| 302 long msec = tv ? evutil_tv_to_msec(tv) : LONG_MAX; | |
| 303 /* Sleep's DWORD argument is unsigned long */ | |
| 304 if (msec < 0) | |
| 305 msec = LONG_MAX; | |
| 306 /* Windows doesn't like you to call select() with no sockets */ | |
| 307 Sleep(msec); | |
| 308 return (0); | |
| 309 } | |
| 310 | |
| 311 EVBASE_RELEASE_LOCK(base, th_base_lock); | |
| 312 | |
| 313 res = select(fd_count, | |
| 314 (struct fd_set*)win32op->readset_out, | |
| 315 (struct fd_set*)win32op->writeset_out, | |
| 316 (struct fd_set*)win32op->exset_out, tv); | |
| 317 | |
| 318 EVBASE_ACQUIRE_LOCK(base, th_base_lock); | |
| 319 | |
| 320 event_debug(("%s: select returned %d", __func__, res)); | |
| 321 | |
| 322 if (res <= 0) { | |
| 323 return res; | |
| 324 } | |
| 325 | |
| 326 if (win32op->readset_out->fd_count) { | |
| 327 i = rand() % win32op->readset_out->fd_count; | |
| 328 for (j=0; j<win32op->readset_out->fd_count; ++j) { | |
| 329 if (++i >= win32op->readset_out->fd_count) | |
| 330 i = 0; | |
| 331 s = win32op->readset_out->fd_array[i]; | |
| 332 evmap_io_active(base, s, EV_READ); | |
| 333 } | |
| 334 } | |
| 335 if (win32op->exset_out->fd_count) { | |
| 336 i = rand() % win32op->exset_out->fd_count; | |
| 337 for (j=0; j<win32op->exset_out->fd_count; ++j) { | |
| 338 if (++i >= win32op->exset_out->fd_count) | |
| 339 i = 0; | |
| 340 s = win32op->exset_out->fd_array[i]; | |
| 341 evmap_io_active(base, s, EV_WRITE); | |
| 342 } | |
| 343 } | |
| 344 if (win32op->writeset_out->fd_count) { | |
| 345 SOCKET s; | |
| 346 i = rand() % win32op->writeset_out->fd_count; | |
| 347 for (j=0; j<win32op->writeset_out->fd_count; ++j) { | |
| 348 if (++i >= win32op->writeset_out->fd_count) | |
| 349 i = 0; | |
| 350 s = win32op->writeset_out->fd_array[i]; | |
| 351 evmap_io_active(base, s, EV_WRITE); | |
| 352 } | |
| 353 } | |
| 354 return (0); | |
| 355 } | |
| 356 | |
| 357 void | |
| 358 win32_dealloc(struct event_base *_base) | |
| 359 { | |
| 360 struct win32op *win32op = _base->evbase; | |
| 361 | |
| 362 evsig_dealloc(_base); | |
| 363 if (win32op->readset_in) | |
| 364 mm_free(win32op->readset_in); | |
| 365 if (win32op->writeset_in) | |
| 366 mm_free(win32op->writeset_in); | |
| 367 if (win32op->readset_out) | |
| 368 mm_free(win32op->readset_out); | |
| 369 if (win32op->writeset_out) | |
| 370 mm_free(win32op->writeset_out); | |
| 371 if (win32op->exset_out) | |
| 372 mm_free(win32op->exset_out); | |
| 373 /* XXXXX free the tree. */ | |
| 374 | |
| 375 memset(win32op, 0, sizeof(win32op)); | |
| 376 mm_free(win32op); | |
| 377 } |
