1 /* $NetBSD: win32select.c,v 1.1.1.1 2013/04/11 16:43:19 christos Exp $ */ 2 /* 3 * Copyright 2007-2012 Niels Provos and Nick Mathewson 4 * Copyright 2000-2007 Niels Provos <provos@citi.umich.edu> 5 * Copyright 2003 Michael A. Davis <mike@datanerds.net> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include <winsock2.h> 31 #include <windows.h> 32 #include <sys/types.h> 33 #include <sys/queue.h> 34 #include <limits.h> 35 #include <signal.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <string.h> 39 #include <errno.h> 40 41 #include "event2/util.h" 42 #include "event2/event-config.h" 43 #include <sys/cdefs.h> 44 __RCSID("$NetBSD: win32select.c,v 1.1.1.1 2013/04/11 16:43:19 christos Exp $"); 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 53 #define XFREE(ptr) do { if (ptr) mm_free(ptr); } while (0) 54 55 extern struct event_list timequeue; 56 extern struct event_list addqueue; 57 58 struct win_fd_set { 59 u_int fd_count; 60 SOCKET fd_array[1]; 61 }; 62 63 /* MSDN says this is required to handle SIGFPE */ 64 volatile double SIGFPE_REQ = 0.0f; 65 66 struct idx_info { 67 int read_pos_plus1; 68 int write_pos_plus1; 69 }; 70 71 struct win32op { 72 unsigned num_fds_in_fd_sets; 73 int resize_out_sets; 74 struct win_fd_set *readset_in; 75 struct win_fd_set *writeset_in; 76 struct win_fd_set *readset_out; 77 struct win_fd_set *writeset_out; 78 struct win_fd_set *exset_out; 79 unsigned signals_are_broken : 1; 80 }; 81 82 static void *win32_init(struct event_base *); 83 static int win32_add(struct event_base *, evutil_socket_t, short old, short events, void *_idx); 84 static int win32_del(struct event_base *, evutil_socket_t, short old, short events, void *_idx); 85 static int win32_dispatch(struct event_base *base, struct timeval *); 86 static void win32_dealloc(struct event_base *); 87 88 struct eventop win32ops = { 89 "win32", 90 win32_init, 91 win32_add, 92 win32_del, 93 win32_dispatch, 94 win32_dealloc, 95 0, /* doesn't need reinit */ 96 0, /* No features supported. */ 97 sizeof(struct idx_info), 98 }; 99 100 #define FD_SET_ALLOC_SIZE(n) ((sizeof(struct win_fd_set) + ((n)-1)*sizeof(SOCKET))) 101 102 static int 103 grow_fd_sets(struct win32op *op, unsigned new_num_fds) 104 { 105 size_t size; 106 107 EVUTIL_ASSERT(new_num_fds >= op->readset_in->fd_count && 108 new_num_fds >= op->writeset_in->fd_count); 109 EVUTIL_ASSERT(new_num_fds >= 1); 110 111 size = FD_SET_ALLOC_SIZE(new_num_fds); 112 if (!(op->readset_in = mm_realloc(op->readset_in, size))) 113 return (-1); 114 if (!(op->writeset_in = mm_realloc(op->writeset_in, size))) 115 return (-1); 116 op->resize_out_sets = 1; 117 op->num_fds_in_fd_sets = new_num_fds; 118 return (0); 119 } 120 121 static int 122 do_fd_set(struct win32op *op, struct idx_info *ent, evutil_socket_t s, int read) 123 { 124 struct win_fd_set *set = read ? op->readset_in : op->writeset_in; 125 if (read) { 126 if (ent->read_pos_plus1 > 0) 127 return (0); 128 } else { 129 if (ent->write_pos_plus1 > 0) 130 return (0); 131 } 132 if (set->fd_count == op->num_fds_in_fd_sets) { 133 if (grow_fd_sets(op, op->num_fds_in_fd_sets*2)) 134 return (-1); 135 /* set pointer will have changed and needs reiniting! */ 136 set = read ? op->readset_in : op->writeset_in; 137 } 138 set->fd_array[set->fd_count] = s; 139 if (read) 140 ent->read_pos_plus1 = set->fd_count+1; 141 else 142 ent->write_pos_plus1 = set->fd_count+1; 143 return (set->fd_count++); 144 } 145 146 static int 147 do_fd_clear(struct event_base *base, 148 struct win32op *op, struct idx_info *ent, int read) 149 { 150 int i; 151 struct win_fd_set *set = read ? op->readset_in : op->writeset_in; 152 if (read) { 153 i = ent->read_pos_plus1 - 1; 154 ent->read_pos_plus1 = 0; 155 } else { 156 i = ent->write_pos_plus1 - 1; 157 ent->write_pos_plus1 = 0; 158 } 159 if (i < 0) 160 return (0); 161 if (--set->fd_count != (unsigned)i) { 162 struct idx_info *ent2; 163 SOCKET s2; 164 s2 = set->fd_array[i] = set->fd_array[set->fd_count]; 165 166 ent2 = evmap_io_get_fdinfo(&base->io, s2); 167 168 if (!ent2) /* This indicates a bug. */ 169 return (0); 170 if (read) 171 ent2->read_pos_plus1 = i+1; 172 else 173 ent2->write_pos_plus1 = i+1; 174 } 175 return (0); 176 } 177 178 #define NEVENT 32 179 void * 180 win32_init(struct event_base *_base) 181 { 182 struct win32op *winop; 183 size_t size; 184 if (!(winop = mm_calloc(1, sizeof(struct win32op)))) 185 return NULL; 186 winop->num_fds_in_fd_sets = NEVENT; 187 size = FD_SET_ALLOC_SIZE(NEVENT); 188 if (!(winop->readset_in = mm_malloc(size))) 189 goto err; 190 if (!(winop->writeset_in = mm_malloc(size))) 191 goto err; 192 if (!(winop->readset_out = mm_malloc(size))) 193 goto err; 194 if (!(winop->writeset_out = mm_malloc(size))) 195 goto err; 196 if (!(winop->exset_out = mm_malloc(size))) 197 goto err; 198 winop->readset_in->fd_count = winop->writeset_in->fd_count = 0; 199 winop->readset_out->fd_count = winop->writeset_out->fd_count 200 = winop->exset_out->fd_count = 0; 201 202 if (evsig_init(_base) < 0) 203 winop->signals_are_broken = 1; 204 205 return (winop); 206 err: 207 XFREE(winop->readset_in); 208 XFREE(winop->writeset_in); 209 XFREE(winop->readset_out); 210 XFREE(winop->writeset_out); 211 XFREE(winop->exset_out); 212 XFREE(winop); 213 return (NULL); 214 } 215 216 int 217 win32_add(struct event_base *base, evutil_socket_t fd, 218 short old, short events, void *_idx) 219 { 220 struct win32op *win32op = base->evbase; 221 struct idx_info *idx = _idx; 222 223 if ((events & EV_SIGNAL) && win32op->signals_are_broken) 224 return (-1); 225 226 if (!(events & (EV_READ|EV_WRITE))) 227 return (0); 228 229 event_debug(("%s: adding event for %d", __func__, (int)fd)); 230 if (events & EV_READ) { 231 if (do_fd_set(win32op, idx, fd, 1)<0) 232 return (-1); 233 } 234 if (events & EV_WRITE) { 235 if (do_fd_set(win32op, idx, fd, 0)<0) 236 return (-1); 237 } 238 return (0); 239 } 240 241 int 242 win32_del(struct event_base *base, evutil_socket_t fd, short old, short events, 243 void *_idx) 244 { 245 struct win32op *win32op = base->evbase; 246 struct idx_info *idx = _idx; 247 248 event_debug(("%s: Removing event for "EV_SOCK_FMT, 249 __func__, EV_SOCK_ARG(fd))); 250 if (events & EV_READ) 251 do_fd_clear(base, win32op, idx, 1); 252 if (events & EV_WRITE) 253 do_fd_clear(base, win32op, idx, 0); 254 255 return 0; 256 } 257 258 static void 259 fd_set_copy(struct win_fd_set *out, const struct win_fd_set *in) 260 { 261 out->fd_count = in->fd_count; 262 memcpy(out->fd_array, in->fd_array, in->fd_count * (sizeof(SOCKET))); 263 } 264 265 /* 266 static void dump_fd_set(struct win_fd_set *s) 267 { 268 unsigned int i; 269 printf("[ "); 270 for(i=0;i<s->fd_count;++i) 271 printf("%d ",(int)s->fd_array[i]); 272 printf("]\n"); 273 } 274 */ 275 276 int 277 win32_dispatch(struct event_base *base, struct timeval *tv) 278 { 279 struct win32op *win32op = base->evbase; 280 int res = 0; 281 unsigned j, i; 282 int fd_count; 283 SOCKET s; 284 285 if (win32op->resize_out_sets) { 286 size_t size = FD_SET_ALLOC_SIZE(win32op->num_fds_in_fd_sets); 287 if (!(win32op->readset_out = mm_realloc(win32op->readset_out, size))) 288 return (-1); 289 if (!(win32op->exset_out = mm_realloc(win32op->exset_out, size))) 290 return (-1); 291 if (!(win32op->writeset_out = mm_realloc(win32op->writeset_out, size))) 292 return (-1); 293 win32op->resize_out_sets = 0; 294 } 295 296 fd_set_copy(win32op->readset_out, win32op->readset_in); 297 fd_set_copy(win32op->exset_out, win32op->writeset_in); 298 fd_set_copy(win32op->writeset_out, win32op->writeset_in); 299 300 fd_count = 301 (win32op->readset_out->fd_count > win32op->writeset_out->fd_count) ? 302 win32op->readset_out->fd_count : win32op->writeset_out->fd_count; 303 304 if (!fd_count) { 305 long msec = tv ? evutil_tv_to_msec(tv) : LONG_MAX; 306 /* Sleep's DWORD argument is unsigned long */ 307 if (msec < 0) 308 msec = LONG_MAX; 309 /* Windows doesn't like you to call select() with no sockets */ 310 Sleep(msec); 311 return (0); 312 } 313 314 EVBASE_RELEASE_LOCK(base, th_base_lock); 315 316 res = select(fd_count, 317 (struct fd_set*)win32op->readset_out, 318 (struct fd_set*)win32op->writeset_out, 319 (struct fd_set*)win32op->exset_out, tv); 320 321 EVBASE_ACQUIRE_LOCK(base, th_base_lock); 322 323 event_debug(("%s: select returned %d", __func__, res)); 324 325 if (res <= 0) { 326 return res; 327 } 328 329 if (win32op->readset_out->fd_count) { 330 i = rand() % win32op->readset_out->fd_count; 331 for (j=0; j<win32op->readset_out->fd_count; ++j) { 332 if (++i >= win32op->readset_out->fd_count) 333 i = 0; 334 s = win32op->readset_out->fd_array[i]; 335 evmap_io_active(base, s, EV_READ); 336 } 337 } 338 if (win32op->exset_out->fd_count) { 339 i = rand() % win32op->exset_out->fd_count; 340 for (j=0; j<win32op->exset_out->fd_count; ++j) { 341 if (++i >= win32op->exset_out->fd_count) 342 i = 0; 343 s = win32op->exset_out->fd_array[i]; 344 evmap_io_active(base, s, EV_WRITE); 345 } 346 } 347 if (win32op->writeset_out->fd_count) { 348 SOCKET s; 349 i = rand() % win32op->writeset_out->fd_count; 350 for (j=0; j<win32op->writeset_out->fd_count; ++j) { 351 if (++i >= win32op->writeset_out->fd_count) 352 i = 0; 353 s = win32op->writeset_out->fd_array[i]; 354 evmap_io_active(base, s, EV_WRITE); 355 } 356 } 357 return (0); 358 } 359 360 void 361 win32_dealloc(struct event_base *_base) 362 { 363 struct win32op *win32op = _base->evbase; 364 365 evsig_dealloc(_base); 366 if (win32op->readset_in) 367 mm_free(win32op->readset_in); 368 if (win32op->writeset_in) 369 mm_free(win32op->writeset_in); 370 if (win32op->readset_out) 371 mm_free(win32op->readset_out); 372 if (win32op->writeset_out) 373 mm_free(win32op->writeset_out); 374 if (win32op->exset_out) 375 mm_free(win32op->exset_out); 376 /* XXXXX free the tree. */ 377 378 memset(win32op, 0, sizeof(win32op)); 379 mm_free(win32op); 380 } 381