The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1 | /* Copyright (C) 2007-2008 The Android Open Source Project |
| 2 | ** |
| 3 | ** This software is licensed under the terms of the GNU General Public |
| 4 | ** License version 2, as published by the Free Software Foundation, and |
| 5 | ** may be copied, distributed, and modified under those terms. |
| 6 | ** |
| 7 | ** This program is distributed in the hope that it will be useful, |
| 8 | ** but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | ** GNU General Public License for more details. |
| 11 | */ |
| 12 | #include "sysdeps.h" |
| 13 | #include <assert.h> |
| 14 | #include <unistd.h> |
| 15 | #include <sys/select.h> |
| 16 | #include <errno.h> |
| 17 | #include <memory.h> |
| 18 | #include <stdio.h> |
| 19 | #ifndef HAVE_WINSOCK |
| 20 | #include <fcntl.h> |
| 21 | #include <sys/socket.h> |
| 22 | #include <sys/select.h> |
| 23 | #include <sys/types.h> |
| 24 | #include <netinet/in.h> |
| 25 | #include <netinet/tcp.h> |
| 26 | #include <netdb.h> |
| 27 | #endif |
| 28 | |
| 29 | /** QUEUE |
| 30 | **/ |
| 31 | #define SYS_MAX_QUEUE 16 |
| 32 | |
| 33 | typedef struct { |
| 34 | int start; |
| 35 | int end; |
| 36 | void* pending[ SYS_MAX_QUEUE ]; |
| 37 | } |
| 38 | SysQueueRec, *SysQueue; |
| 39 | |
| 40 | static void |
| 41 | sys_queue_reset( SysQueue queue ) |
| 42 | { |
| 43 | queue->start = queue->end = 0; |
| 44 | } |
| 45 | |
| 46 | static void |
| 47 | sys_queue_add( SysQueue queue, void* item ) |
| 48 | { |
| 49 | assert( queue->end - queue->start < SYS_MAX_QUEUE ); |
| 50 | assert( queue->start == 0 ); |
| 51 | assert( item != NULL ); |
| 52 | queue->pending[ queue->end++ ] = item; |
| 53 | } |
| 54 | |
| 55 | #if 0 |
| 56 | static void |
| 57 | sys_queue_remove( SysQueue queue, void* item ) |
| 58 | { |
| 59 | int nn, count; |
| 60 | assert( queue->end > queue->start ); |
| 61 | assert( item != NULL ); |
| 62 | count = queue->end - queue->start; |
| 63 | for ( nn = queue->start; count > 0; ++nn, --count ) { |
| 64 | if ( queue->pending[nn] == item ) { |
| 65 | queue->pending[nn] = queue->pending[nn+count-1]; |
| 66 | queue->end -= 1; |
| 67 | break; |
| 68 | } |
| 69 | } |
| 70 | assert( 0 && "sys_queue_remove: item not found" ); |
| 71 | } |
| 72 | #endif |
| 73 | |
| 74 | static void* |
| 75 | sys_queue_get( SysQueue queue ) |
| 76 | { |
| 77 | if (queue->end > queue->start) { |
| 78 | return queue->pending[ queue->start++ ]; |
| 79 | } |
| 80 | return NULL; |
| 81 | } |
| 82 | |
| 83 | /** CHANNELS |
| 84 | **/ |
| 85 | typedef struct SysChannelRec_ { |
| 86 | SysChannel next; |
| 87 | int fd; |
| 88 | char active; |
| 89 | char pending; |
| 90 | char closed; |
| 91 | int wanted; |
| 92 | int ready; |
| 93 | SysChannelCallback callback; |
| 94 | void* opaque; |
| 95 | } SysChannelRec; |
| 96 | |
| 97 | |
| 98 | /*** channel allocation ***/ |
| 99 | #define SYS_EVENT_MAX 3 |
| 100 | #define SYS_MAX_CHANNELS 16 |
| 101 | |
| 102 | static SysChannelRec _s_channels0[ SYS_MAX_CHANNELS ]; |
| 103 | static SysChannel _s_free_channels; |
| 104 | |
| 105 | static SysChannel |
| 106 | sys_channel_alloc( void ) |
| 107 | { |
| 108 | SysChannel channel = _s_free_channels; |
| 109 | assert( channel != NULL && "out of free channels" ); |
| 110 | _s_free_channels = channel->next; |
| 111 | channel->next = NULL; |
| 112 | channel->active = 0; |
| 113 | channel->closed = 0; |
| 114 | channel->pending = 0; |
| 115 | channel->wanted = 0; |
| 116 | return channel; |
| 117 | } |
| 118 | |
| 119 | static void |
| 120 | sys_channel_free( SysChannel channel ) |
| 121 | { |
| 122 | if (channel->fd >= 0) { |
| 123 | #ifdef _WIN32 |
| 124 | shutdown( channel->fd, SD_BOTH ); |
| 125 | #else |
| 126 | shutdown( channel->fd, SHUT_RDWR ); |
| 127 | #endif |
| 128 | close(channel->fd); |
| 129 | channel->fd = -1; |
| 130 | } |
| 131 | channel->wanted = 0; |
| 132 | channel->ready = 0; |
| 133 | channel->callback = NULL; |
| 134 | |
| 135 | channel->next = _s_free_channels; |
| 136 | _s_free_channels = channel; |
| 137 | } |
| 138 | |
| 139 | |
| 140 | /* list of active channels */ |
| 141 | static SysChannel _s_channels; |
| 142 | |
| 143 | /* used by select to wait on channel events */ |
| 144 | static fd_set _s_fdsets[SYS_EVENT_MAX]; |
| 145 | static int _s_maxfd; |
| 146 | |
| 147 | static void |
| 148 | sys_channel_deactivate( SysChannel channel ) |
| 149 | { |
| 150 | assert( channel->active != 0 ); |
| 151 | SysChannel *pnode = &_s_channels; |
| 152 | for (;;) { |
| 153 | SysChannel node = *pnode; |
| 154 | assert( node != NULL ); |
| 155 | if (node == channel) |
| 156 | break; |
| 157 | pnode = &node->next; |
| 158 | } |
| 159 | *pnode = channel->next; |
| 160 | channel->next = NULL; |
| 161 | channel->active = 0; |
| 162 | } |
| 163 | |
| 164 | static void |
| 165 | sys_channel_activate( SysChannel channel ) |
| 166 | { |
| 167 | assert( channel->active == 0 ); |
| 168 | channel->next = _s_channels; |
| 169 | _s_channels = channel; |
| 170 | channel->active = 1; |
| 171 | if (channel->fd > _s_maxfd) |
| 172 | _s_maxfd = channel->fd; |
| 173 | } |
| 174 | |
| 175 | |
| 176 | /* queue of pending channels */ |
| 177 | static SysQueueRec _s_pending_channels[1]; |
| 178 | |
| 179 | |
| 180 | static void |
| 181 | sys_init_channels( void ) |
| 182 | { |
| 183 | int nn; |
| 184 | |
| 185 | for (nn = 0; nn < SYS_MAX_CHANNELS-1; nn++) |
| 186 | _s_channels0[nn].next = &_s_channels0[nn+1]; |
| 187 | _s_free_channels = &_s_channels0[0]; |
| 188 | |
| 189 | for (nn = 0; nn < SYS_EVENT_MAX; nn++) |
| 190 | FD_ZERO( &_s_fdsets[nn] ); |
| 191 | |
| 192 | _s_maxfd = -1; |
| 193 | |
| 194 | sys_queue_reset( _s_pending_channels ); |
| 195 | } |
| 196 | |
| 197 | |
| 198 | void |
| 199 | sys_channel_on( SysChannel channel, |
| 200 | int events, |
| 201 | SysChannelCallback callback, |
| 202 | void* opaque ) |
| 203 | { |
| 204 | int adds = events & ~channel->wanted; |
| 205 | int removes = channel->wanted & ~events; |
| 206 | |
| 207 | channel->wanted = events; |
| 208 | channel->callback = callback; |
| 209 | channel->opaque = opaque; |
| 210 | |
| 211 | /* update global fdsets */ |
| 212 | if (adds) { |
| 213 | int ee; |
| 214 | for (ee = 0; ee < SYS_EVENT_MAX; ee++) |
| 215 | if (adds & (1 << ee)) |
| 216 | FD_SET( channel->fd, &_s_fdsets[ee] ); |
| 217 | } |
| 218 | if (removes) { |
| 219 | int ee; |
| 220 | for (ee = 0; ee < SYS_EVENT_MAX; ee++) |
| 221 | if (removes & (1 << ee)) |
| 222 | FD_CLR( channel->fd, &_s_fdsets[ee] ); |
| 223 | } |
| 224 | if (events && !channel->active) { |
| 225 | sys_channel_activate( channel ); |
| 226 | } |
| 227 | else if (!events && channel->active) { |
| 228 | sys_channel_deactivate( channel ); |
| 229 | } |
| 230 | } |
| 231 | |
| 232 | int |
| 233 | sys_channel_read( SysChannel channel, void* buffer, int size ) |
| 234 | { |
| 235 | char* buff = buffer; |
| 236 | int count = 0; |
| 237 | |
| 238 | assert( !channel->closed ); |
| 239 | |
| 240 | while (size > 0) { |
| 241 | int len = read(channel->fd, buff, size); |
| 242 | if (len < 0) { |
| 243 | if (errno == EINTR) |
| 244 | continue; |
| 245 | if (count == 0) |
| 246 | count = -1; |
| 247 | break; |
| 248 | } |
| 249 | buff += len; |
| 250 | size -= len; |
| 251 | count += len; |
| 252 | } |
| 253 | return count; |
| 254 | } |
| 255 | |
| 256 | |
| 257 | int |
| 258 | sys_channel_write( SysChannel channel, const void* buffer, int size ) |
| 259 | { |
| 260 | const char* buff = buffer; |
| 261 | int count = 0; |
| 262 | |
| 263 | assert( !channel->closed ); |
| 264 | |
| 265 | while (size > 0) { |
| 266 | int len = write(channel->fd, buff, size); |
| 267 | if (len < 0) { |
| 268 | if (errno == EINTR) |
| 269 | continue; |
| 270 | if (count == 0) |
| 271 | count = -1; |
| 272 | break; |
| 273 | } |
| 274 | buff += len; |
| 275 | size -= len; |
| 276 | count += len; |
| 277 | } |
| 278 | return count; |
| 279 | } |
| 280 | |
| 281 | |
| 282 | void |
| 283 | sys_channel_close( SysChannel channel ) |
| 284 | { |
| 285 | if (channel->active) { |
| 286 | sys_channel_on( channel, 0, NULL, NULL ); |
| 287 | } |
| 288 | |
| 289 | if (channel->pending) { |
| 290 | /* we can't free the channel right now because it */ |
| 291 | /* is in the pending list, set a flag */ |
| 292 | channel->closed = 1; |
| 293 | return; |
| 294 | } |
| 295 | |
| 296 | if (!channel->closed) { |
| 297 | channel->closed = 1; |
| 298 | } |
| 299 | |
| 300 | sys_channel_free( channel ); |
| 301 | } |
| 302 | |
| 303 | /** time measurement |
| 304 | **/ |
| 305 | SysTime sys_time_ms( void ) |
| 306 | { |
| 307 | struct timeval tv; |
| 308 | gettimeofday( &tv, NULL ); |
| 309 | return (SysTime)(tv.tv_usec / 1000) + (SysTime)tv.tv_sec * 1000; |
| 310 | } |
| 311 | |
| 312 | /** timers |
| 313 | **/ |
| 314 | typedef struct SysTimerRec_ |
| 315 | { |
| 316 | SysTimer next; |
| 317 | SysTime when; |
| 318 | SysCallback callback; |
| 319 | void* opaque; |
| 320 | } SysTimerRec; |
| 321 | |
| 322 | #define SYS_MAX_TIMERS 16 |
| 323 | |
| 324 | static SysTimerRec _s_timers0[ SYS_MAX_TIMERS ]; |
| 325 | static SysTimer _s_free_timers; |
| 326 | static SysTimer _s_timers; |
| 327 | |
| 328 | static SysQueueRec _s_pending_timers[1]; |
| 329 | |
| 330 | |
| 331 | static void |
| 332 | sys_init_timers( void ) |
| 333 | { |
| 334 | int nn; |
| 335 | for (nn = 0; nn < SYS_MAX_TIMERS-1; nn++) { |
| 336 | _s_timers0[nn].next = & _s_timers0[nn+1]; |
| 337 | } |
| 338 | _s_free_timers = &_s_timers0[0]; |
| 339 | |
| 340 | sys_queue_reset( _s_pending_timers ); |
| 341 | } |
| 342 | |
| 343 | |
| 344 | SysTimer sys_timer_create( void ) |
| 345 | { |
| 346 | SysTimer timer = _s_free_timers; |
| 347 | assert( timer != NULL && "too many timers allocated" ); |
| 348 | _s_free_timers = timer->next; |
| 349 | timer->next = NULL; |
| 350 | return timer; |
| 351 | } |
| 352 | |
| 353 | |
| 354 | void sys_timer_unset( SysTimer timer ) |
| 355 | { |
| 356 | if (timer->callback != NULL) { |
| 357 | SysTimer *pnode, node; |
| 358 | pnode = &_s_timers; |
| 359 | for (;;) { |
| 360 | node = *pnode; |
| 361 | if (node == NULL) |
| 362 | break; |
| 363 | if (node == timer) { |
| 364 | *pnode = node->next; |
| 365 | break; |
| 366 | } |
| 367 | pnode = &node->next; |
| 368 | } |
| 369 | timer->next = NULL; |
| 370 | timer->callback = NULL; |
| 371 | timer->opaque = NULL; |
| 372 | } |
| 373 | } |
| 374 | |
| 375 | |
| 376 | void sys_timer_set( SysTimer timer, |
| 377 | SysTime when, |
| 378 | SysCallback callback, |
| 379 | void* opaque ) |
| 380 | { |
| 381 | if (timer->callback != NULL) |
| 382 | sys_timer_unset(timer); |
| 383 | |
| 384 | if (callback != NULL) { |
| 385 | SysTime now = sys_time_ms(); |
| 386 | |
| 387 | if (now >= when) { |
| 388 | callback( opaque ); |
| 389 | } else { |
| 390 | SysTimer *pnode, node; |
| 391 | pnode = &_s_timers; |
| 392 | for (;;) { |
| 393 | node = *pnode; |
| 394 | if (node == NULL || node->when >= when) { |
| 395 | break; |
| 396 | } |
| 397 | pnode = &node->next; |
| 398 | } |
| 399 | timer->next = *pnode; |
| 400 | *pnode = timer; |
| 401 | timer->when = when; |
| 402 | timer->callback = callback; |
| 403 | timer->opaque = opaque; |
| 404 | } |
| 405 | } |
| 406 | } |
| 407 | |
| 408 | |
| 409 | void sys_timer_destroy( SysTimer timer ) |
| 410 | { |
| 411 | assert( timer != NULL && "sys_timer_destroy: bad argument" ); |
| 412 | if (timer->callback != NULL) |
| 413 | sys_timer_unset(timer); |
| 414 | |
| 415 | timer->next = _s_free_timers; |
| 416 | _s_free_timers = timer; |
| 417 | } |
| 418 | |
| 419 | |
| 420 | static void |
| 421 | sys_single_loop( void ) |
| 422 | { |
| 423 | fd_set rfd, wfd, efd; |
| 424 | struct timeval timeout_tv, *timeout = NULL; |
| 425 | int n; |
| 426 | |
| 427 | memcpy(&rfd, &_s_fdsets[0], sizeof(fd_set)); |
| 428 | memcpy(&wfd, &_s_fdsets[1], sizeof(fd_set)); |
| 429 | memcpy(&efd, &_s_fdsets[2], sizeof(fd_set)); |
| 430 | |
| 431 | if ( _s_timers != NULL ) { |
| 432 | SysTime now = sys_time_ms(); |
| 433 | SysTimer first = _s_timers; |
| 434 | |
| 435 | timeout = &timeout_tv; |
| 436 | if (first->when <= now) { |
| 437 | timeout->tv_sec = 0; |
| 438 | timeout->tv_usec = 0; |
| 439 | } else { |
| 440 | SysTime diff = first->when - now; |
| 441 | timeout->tv_sec = diff / 1000; |
| 442 | timeout->tv_usec = (diff - timeout->tv_sec*1000) * 1000; |
| 443 | } |
| 444 | } |
| 445 | |
| 446 | n = select( _s_maxfd+1, &rfd, &wfd, &efd, timeout); |
| 447 | if(n < 0) { |
| 448 | if(errno == EINTR) return; |
| 449 | perror("select"); |
| 450 | return; |
| 451 | } |
| 452 | |
| 453 | /* enqueue pending channels */ |
| 454 | { |
| 455 | int i; |
| 456 | |
| 457 | sys_queue_reset( _s_pending_channels ); |
| 458 | for(i = 0; (i <= _s_maxfd) && (n > 0); i++) |
| 459 | { |
| 460 | int events = 0; |
| 461 | |
| 462 | if(FD_ISSET(i, &rfd)) events |= SYS_EVENT_READ; |
| 463 | if(FD_ISSET(i, &wfd)) events |= SYS_EVENT_WRITE; |
| 464 | if(FD_ISSET(i, &efd)) events |= SYS_EVENT_ERROR; |
| 465 | |
| 466 | if (events) { |
| 467 | SysChannel channel; |
| 468 | |
| 469 | n--; |
| 470 | for (channel = _s_channels; channel; channel = channel->next) |
| 471 | { |
| 472 | if (channel->fd != i) |
| 473 | continue; |
| 474 | |
| 475 | channel->ready = events; |
| 476 | channel->pending = 1; |
| 477 | sys_queue_add( _s_pending_channels, channel ); |
| 478 | break; |
| 479 | } |
| 480 | } |
| 481 | } |
| 482 | } |
| 483 | |
| 484 | /* enqueue pending timers */ |
| 485 | { |
| 486 | SysTimer timer = _s_timers; |
| 487 | SysTime now = sys_time_ms(); |
| 488 | |
| 489 | sys_queue_reset( _s_pending_timers ); |
| 490 | while (timer != NULL) |
| 491 | { |
| 492 | if (timer->when > now) |
| 493 | break; |
| 494 | |
| 495 | sys_queue_add( _s_pending_timers, timer ); |
| 496 | _s_timers = timer = timer->next; |
| 497 | } |
| 498 | } |
| 499 | } |
| 500 | |
| 501 | void sys_main_init( void ) |
| 502 | { |
| 503 | sys_init_channels(); |
| 504 | sys_init_timers(); |
| 505 | } |
| 506 | |
| 507 | |
| 508 | int sys_main_loop( void ) |
| 509 | { |
| 510 | for (;;) { |
| 511 | SysTimer timer; |
| 512 | SysChannel channel; |
| 513 | |
| 514 | /* exit if we have nothing to do */ |
| 515 | if (_s_channels == NULL && _s_timers == NULL) |
| 516 | break; |
| 517 | |
| 518 | sys_single_loop(); |
| 519 | |
| 520 | while ((timer = sys_queue_get( _s_pending_timers )) != NULL) { |
| 521 | timer->callback( timer->opaque ); |
| 522 | } |
| 523 | |
| 524 | while ((channel = sys_queue_get( _s_pending_channels )) != NULL) { |
| 525 | int events; |
| 526 | |
| 527 | channel->pending = 0; |
| 528 | if (channel->closed) { |
| 529 | /* the channel was closed by a previous callback */ |
| 530 | sys_channel_close(channel); |
| 531 | } |
| 532 | events = channel->ready; |
| 533 | channel->ready = 0; |
| 534 | channel->callback( channel->opaque, events ); |
| 535 | } |
| 536 | } |
| 537 | return 0; |
| 538 | } |
| 539 | |
| 540 | |
| 541 | |
| 542 | |
| 543 | SysChannel |
| 544 | sys_channel_create_tcp_server( int port ) |
| 545 | { |
| 546 | SysChannel channel; |
| 547 | int on = 1; |
| 548 | const int BACKLOG = 4; |
| 549 | |
| 550 | channel = sys_channel_alloc(); |
| 551 | if (-1==(channel->fd=socket(AF_INET, SOCK_STREAM, 0))) { |
| 552 | perror("socket"); |
| 553 | sys_channel_free( channel ); |
| 554 | return NULL; |
| 555 | } |
| 556 | |
| 557 | /* Enable address re-use for server mode */ |
| 558 | if ( -1==setsockopt( channel->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on) )) { |
| 559 | perror("setsockopt(SO_REUSEADDR)"); |
| 560 | } |
| 561 | |
| 562 | { |
| 563 | struct sockaddr_in servname; |
| 564 | long in_addr = INADDR_ANY; |
| 565 | |
| 566 | servname.sin_family = AF_INET; |
| 567 | servname.sin_port = htons(port); |
| 568 | |
| 569 | servname.sin_addr.s_addr=in_addr; |
| 570 | |
| 571 | if (-1==bind(channel->fd, (struct sockaddr*)&servname, sizeof(servname))) { |
| 572 | perror("bind"); |
| 573 | sys_channel_close(channel); |
| 574 | return NULL; |
| 575 | } |
| 576 | |
| 577 | /* Listen but don't accept */ |
| 578 | if ( listen(channel->fd, BACKLOG) < 0 ) { |
| 579 | perror("listen"); |
| 580 | sys_channel_close(channel); |
| 581 | return NULL; |
| 582 | } |
| 583 | } |
| 584 | return channel; |
| 585 | } |
| 586 | |
| 587 | |
| 588 | SysChannel |
| 589 | sys_channel_create_tcp_handler( SysChannel server_channel ) |
| 590 | { |
| 591 | int on = 1; |
| 592 | SysChannel channel = sys_channel_alloc(); |
| 593 | |
| 594 | channel->fd = accept( server_channel->fd, NULL, 0 ); |
| 595 | if (channel->fd < 0) { |
| 596 | perror( "accept" ); |
| 597 | sys_channel_free( channel ); |
| 598 | return NULL; |
| 599 | } |
| 600 | |
| 601 | /* set to non-blocking and disable TCP Nagle algorithm */ |
| 602 | fcntl(channel->fd, F_SETFL, O_NONBLOCK); |
| 603 | setsockopt(channel->fd, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)); |
| 604 | return channel; |
| 605 | } |
| 606 | |
| 607 | |
| 608 | SysChannel |
| 609 | sys_channel_create_tcp_client( const char* hostname, int port ) |
| 610 | { |
| 611 | struct hostent* hp; |
| 612 | struct sockaddr_in addr; |
| 613 | SysChannel channel = sys_channel_alloc(); |
| 614 | int on = 1; |
| 615 | |
| 616 | hp = gethostbyname(hostname); |
| 617 | if(hp == 0) { |
| 618 | fprintf(stderr, "unknown host: %s\n", hostname); |
| 619 | sys_channel_free(channel); |
| 620 | return NULL; |
| 621 | }; |
| 622 | |
| 623 | memset(&addr, 0, sizeof(addr)); |
| 624 | addr.sin_family = hp->h_addrtype; |
| 625 | addr.sin_port = htons(port); |
| 626 | memcpy(&addr.sin_addr, hp->h_addr, hp->h_length); |
| 627 | |
| 628 | channel->fd = socket(hp->h_addrtype, SOCK_STREAM, 0); |
| 629 | if(channel->fd < 0) { |
| 630 | sys_channel_free(channel); |
| 631 | return NULL; |
| 632 | } |
| 633 | |
| 634 | if(connect( channel->fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) { |
| 635 | perror( "connect" ); |
| 636 | sys_channel_free(channel); |
| 637 | return NULL; |
| 638 | } |
| 639 | |
| 640 | /* set to non-blocking and disable Nagle algorithm */ |
| 641 | fcntl(channel->fd, F_SETFL, O_NONBLOCK); |
| 642 | setsockopt( channel->fd, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on) ); |
| 643 | return channel; |
| 644 | } |
| 645 | |