1 /* 2 * Copyright 2007-2012 Niels Provos and Nick Mathewson 3 * Copyright 2000-2007 Niels Provos <provos (at) citi.umich.edu> 4 * Copyright 2003 Michael A. Davis <mike (at) 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 } 378
