1 /* $NetBSD: win32select.c,v 1.4 2016/01/08 21:35:40 christos Exp $ */ 2 3 /* 4 * Copyright 2007-2012 Niels Provos and Nick Mathewson 5 * Copyright 2000-2007 Niels Provos <provos@citi.umich.edu> 6 * Copyright 2003 Michael A. Davis <mike@datanerds.net> 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 #include "event2/event-config.h" 31 #include "evconfig-private.h" 32 33 #ifdef _WIN32 34 35 #include <winsock2.h> 36 #include <windows.h> 37 #include <sys/types.h> 38 #include <sys/queue.h> 39 #include <limits.h> 40 #include <signal.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <errno.h> 45 46 #include "event2/util.h" 47 #include "util-internal.h" 48 #include "log-internal.h" 49 #include "event2/event.h" 50 #include "event-internal.h" 51 #include "evmap-internal.h" 52 #include "event2/thread.h" 53 #include "evthread-internal.h" 54 #include "time-internal.h" 55 56 #define XFREE(ptr) do { if (ptr) mm_free(ptr); } while (0) 57 58 extern struct event_list timequeue; 59 extern struct event_list addqueue; 60 61 struct win_fd_set { 62 u_int fd_count; 63 SOCKET fd_array[1]; 64 }; 65 66 /* MSDN says this is required to handle SIGFPE */ 67 volatile double SIGFPE_REQ = 0.0f; 68 69 struct idx_info { 70 int read_pos_plus1; 71 int write_pos_plus1; 72 }; 73 74 struct win32op { 75 unsigned num_fds_in_fd_sets; 76 int resize_out_sets; 77 struct win_fd_set *readset_in; 78 struct win_fd_set *writeset_in; 79 struct win_fd_set *readset_out; 80 struct win_fd_set *writeset_out; 81 struct win_fd_set *exset_out; 82 unsigned signals_are_broken : 1; 83 }; 84 85 static void *win32_init(struct event_base *); 86 static int win32_add(struct event_base *, evutil_socket_t, short old, short events, void *idx_); 87 static int win32_del(struct event_base *, evutil_socket_t, short old, short events, void *idx_); 88 static int win32_dispatch(struct event_base *base, struct timeval *); 89 static void win32_dealloc(struct event_base *); 90 91 struct eventop win32ops = { 92 "win32", 93 win32_init, 94 win32_add, 95 win32_del, 96 win32_dispatch, 97 win32_dealloc, 98 0, /* doesn't need reinit */ 99 0, /* No features supported. */ 100 sizeof(struct idx_info), 101 }; 102 103 #define FD_SET_ALLOC_SIZE(n) ((sizeof(struct win_fd_set) + ((n)-1)*sizeof(SOCKET))) 104 105 static int 106 grow_fd_sets(struct win32op *op, unsigned new_num_fds) 107 { 108 size_t size; 109 110 EVUTIL_ASSERT(new_num_fds >= op->readset_in->fd_count && 111 new_num_fds >= op->writeset_in->fd_count); 112 EVUTIL_ASSERT(new_num_fds >= 1); 113 114 size = FD_SET_ALLOC_SIZE(new_num_fds); 115 if (!(op->readset_in = mm_realloc(op->readset_in, size))) 116 return (-1); 117 if (!(op->writeset_in = mm_realloc(op->writeset_in, size))) 118 return (-1); 119 op->resize_out_sets = 1; 120 op->num_fds_in_fd_sets = new_num_fds; 121 return (0); 122 } 123 124 static int 125 do_fd_set(struct win32op *op, struct idx_info *ent, evutil_socket_t s, int read) 126 { 127 struct win_fd_set *set = read ? op->readset_in : op->writeset_in; 128 if (read) { 129 if (ent->read_pos_plus1 > 0) 130 return (0); 131 } else { 132 if (ent->write_pos_plus1 > 0) 133 return (0); 134 } 135 if (set->fd_count == op->num_fds_in_fd_sets) { 136 if (grow_fd_sets(op, op->num_fds_in_fd_sets*2)) 137 return (-1); 138 /* set pointer will have changed and needs reiniting! */ 139 set = read ? op->readset_in : op->writeset_in; 140 } 141 set->fd_array[set->fd_count] = s; 142 if (read) 143 ent->read_pos_plus1 = set->fd_count+1; 144 else 145 ent->write_pos_plus1 = set->fd_count+1; 146 return (set->fd_count++); 147 } 148 149 static int 150 do_fd_clear(struct event_base *base, 151 struct win32op *op, struct idx_info *ent, int read) 152 { 153 int i; 154 struct win_fd_set *set = read ? op->readset_in : op->writeset_in; 155 if (read) { 156 i = ent->read_pos_plus1 - 1; 157 ent->read_pos_plus1 = 0; 158 } else { 159 i = ent->write_pos_plus1 - 1; 160 ent->write_pos_plus1 = 0; 161 } 162 if (i < 0) 163 return (0); 164 if (--set->fd_count != (unsigned)i) { 165 struct idx_info *ent2; 166 SOCKET s2; 167 s2 = set->fd_array[i] = set->fd_array[set->fd_count]; 168 169 ent2 = evmap_io_get_fdinfo_(&base->io, s2); 170 171 if (!ent2) /* This indicates a bug. */ 172 return (0); 173 if (read) 174 ent2->read_pos_plus1 = i+1; 175 else 176 ent2->write_pos_plus1 = i+1; 177 } 178 return (0); 179 } 180 181 #define NEVENT 32 182 void * 183 win32_init(struct event_base *base) 184 { 185 struct win32op *winop; 186 size_t size; 187 if (!(winop = mm_calloc(1, sizeof(struct win32op)))) 188 return NULL; 189 winop->num_fds_in_fd_sets = NEVENT; 190 size = FD_SET_ALLOC_SIZE(NEVENT); 191 if (!(winop->readset_in = mm_malloc(size))) 192 goto err; 193 if (!(winop->writeset_in = mm_malloc(size))) 194 goto err; 195 if (!(winop->readset_out = mm_malloc(size))) 196 goto err; 197 if (!(winop->writeset_out = mm_malloc(size))) 198 goto err; 199 if (!(winop->exset_out = mm_malloc(size))) 200 goto err; 201 winop->readset_in->fd_count = winop->writeset_in->fd_count = 0; 202 winop->readset_out->fd_count = winop->writeset_out->fd_count 203 = winop->exset_out->fd_count = 0; 204 205 if (evsig_init_(base) < 0) 206 winop->signals_are_broken = 1; 207 208 evutil_weakrand_seed_(&base->weakrand_seed, 0); 209 210 return (winop); 211 err: 212 XFREE(winop->readset_in); 213 XFREE(winop->writeset_in); 214 XFREE(winop->readset_out); 215 XFREE(winop->writeset_out); 216 XFREE(winop->exset_out); 217 XFREE(winop); 218 return (NULL); 219 } 220 221 int 222 win32_add(struct event_base *base, evutil_socket_t fd, 223 short old, short events, void *idx_) 224 { 225 struct win32op *win32op = base->evbase; 226 struct idx_info *idx = idx_; 227 228 if ((events & EV_SIGNAL) && win32op->signals_are_broken) 229 return (-1); 230 231 if (!(events & (EV_READ|EV_WRITE))) 232 return (0); 233 234 event_debug(("%s: adding event for %d", __func__, (int)fd)); 235 if (events & EV_READ) { 236 if (do_fd_set(win32op, idx, fd, 1)<0) 237 return (-1); 238 } 239 if (events & EV_WRITE) { 240 if (do_fd_set(win32op, idx, fd, 0)<0) 241 return (-1); 242 } 243 return (0); 244 } 245 246 int 247 win32_del(struct event_base *base, evutil_socket_t fd, short old, short events, 248 void *idx_) 249 { 250 struct win32op *win32op = base->evbase; 251 struct idx_info *idx = idx_; 252 253 event_debug(("%s: Removing event for "EV_SOCK_FMT, 254 __func__, EV_SOCK_ARG(fd))); 255 if (events & EV_READ) 256 do_fd_clear(base, win32op, idx, 1); 257 if (events & EV_WRITE) 258 do_fd_clear(base, win32op, idx, 0); 259 260 return 0; 261 } 262 263 static void 264 fd_set_copy(struct win_fd_set *out, const struct win_fd_set *in) 265 { 266 out->fd_count = in->fd_count; 267 memcpy(out->fd_array, in->fd_array, in->fd_count * (sizeof(SOCKET))); 268 } 269 270 /* 271 static void dump_fd_set(struct win_fd_set *s) 272 { 273 unsigned int i; 274 printf("[ "); 275 for(i=0;i<s->fd_count;++i) 276 printf("%d ",(int)s->fd_array[i]); 277 printf("]\n"); 278 } 279 */ 280 281 int 282 win32_dispatch(struct event_base *base, struct timeval *tv) 283 { 284 struct win32op *win32op = base->evbase; 285 int res = 0; 286 unsigned j, i; 287 int fd_count; 288 SOCKET s; 289 290 if (win32op->resize_out_sets) { 291 size_t size = FD_SET_ALLOC_SIZE(win32op->num_fds_in_fd_sets); 292 if (!(win32op->readset_out = mm_realloc(win32op->readset_out, size))) 293 return (-1); 294 if (!(win32op->exset_out = mm_realloc(win32op->exset_out, size))) 295 return (-1); 296 if (!(win32op->writeset_out = mm_realloc(win32op->writeset_out, size))) 297 return (-1); 298 win32op->resize_out_sets = 0; 299 } 300 301 fd_set_copy(win32op->readset_out, win32op->readset_in); 302 fd_set_copy(win32op->exset_out, win32op->writeset_in); 303 fd_set_copy(win32op->writeset_out, win32op->writeset_in); 304 305 fd_count = 306 (win32op->readset_out->fd_count > win32op->writeset_out->fd_count) ? 307 win32op->readset_out->fd_count : win32op->writeset_out->fd_count; 308 309 if (!fd_count) { 310 long msec = tv ? evutil_tv_to_msec_(tv) : LONG_MAX; 311 /* Sleep's DWORD argument is unsigned long */ 312 if (msec < 0) 313 msec = LONG_MAX; 314 /* Windows doesn't like you to call select() with no sockets */ 315 Sleep(msec); 316 return (0); 317 } 318 319 EVBASE_RELEASE_LOCK(base, th_base_lock); 320 321 res = select(fd_count, 322 (struct fd_set*)win32op->readset_out, 323 (struct fd_set*)win32op->writeset_out, 324 (struct fd_set*)win32op->exset_out, tv); 325 326 EVBASE_ACQUIRE_LOCK(base, th_base_lock); 327 328 event_debug(("%s: select returned %d", __func__, res)); 329 330 if (res <= 0) { 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 SOCKET s; 356 i = evutil_weakrand_range_(&base->weakrand_seed, 357 win32op->writeset_out->fd_count); 358 for (j=0; j<win32op->writeset_out->fd_count; ++j) { 359 if (++i >= win32op->writeset_out->fd_count) 360 i = 0; 361 s = win32op->writeset_out->fd_array[i]; 362 evmap_io_active_(base, s, EV_WRITE); 363 } 364 } 365 return (0); 366 } 367 368 void 369 win32_dealloc(struct event_base *base) 370 { 371 struct win32op *win32op = base->evbase; 372 373 evsig_dealloc_(base); 374 if (win32op->readset_in) 375 mm_free(win32op->readset_in); 376 if (win32op->writeset_in) 377 mm_free(win32op->writeset_in); 378 if (win32op->readset_out) 379 mm_free(win32op->readset_out); 380 if (win32op->writeset_out) 381 mm_free(win32op->writeset_out); 382 if (win32op->exset_out) 383 mm_free(win32op->exset_out); 384 /* XXXXX free the tree. */ 385 386 memset(win32op, 0, sizeof(*win32op)); 387 mm_free(win32op); 388 } 389 390 #endif 391