win32select.c (10626B)
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 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 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 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 * 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 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 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 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 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 event_debug(("%s: %s", __func__, 330 evutil_socket_error_to_string(EVUTIL_SOCKET_ERROR()))); 331 return res; 332 } 333 334 if (win32op->readset_out->fd_count) { 335 i = evutil_weakrand_range_(&base->weakrand_seed, 336 win32op->readset_out->fd_count); 337 for (j=0; j<win32op->readset_out->fd_count; ++j) { 338 if (++i >= win32op->readset_out->fd_count) 339 i = 0; 340 s = win32op->readset_out->fd_array[i]; 341 evmap_io_active_(base, s, EV_READ); 342 } 343 } 344 if (win32op->exset_out->fd_count) { 345 i = evutil_weakrand_range_(&base->weakrand_seed, 346 win32op->exset_out->fd_count); 347 for (j=0; j<win32op->exset_out->fd_count; ++j) { 348 if (++i >= win32op->exset_out->fd_count) 349 i = 0; 350 s = win32op->exset_out->fd_array[i]; 351 evmap_io_active_(base, s, EV_WRITE); 352 } 353 } 354 if (win32op->writeset_out->fd_count) { 355 i = evutil_weakrand_range_(&base->weakrand_seed, 356 win32op->writeset_out->fd_count); 357 for (j=0; j<win32op->writeset_out->fd_count; ++j) { 358 if (++i >= win32op->writeset_out->fd_count) 359 i = 0; 360 s = win32op->writeset_out->fd_array[i]; 361 evmap_io_active_(base, s, EV_WRITE); 362 } 363 } 364 return (0); 365 } 366 367 void 368 win32_dealloc(struct event_base *base) 369 { 370 struct win32op *win32op = base->evbase; 371 372 evsig_dealloc_(base); 373 if (win32op->readset_in) 374 mm_free(win32op->readset_in); 375 if (win32op->writeset_in) 376 mm_free(win32op->writeset_in); 377 if (win32op->readset_out) 378 mm_free(win32op->readset_out); 379 if (win32op->writeset_out) 380 mm_free(win32op->writeset_out); 381 if (win32op->exset_out) 382 mm_free(win32op->exset_out); 383 /* XXXXX free the tree. */ 384 385 memset(win32op, 0, sizeof(*win32op)); 386 mm_free(win32op); 387 } 388 389 #endif