The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 1 | /* http://frotznet.googlecode.com/svn/trunk/utils/fdevent.c |
| 2 | ** |
| 3 | ** Copyright 2006, Brian Swetland <swetland@frotz.net> |
| 4 | ** |
JP Abgrall | 69c5c4c | 2011-02-18 14:16:59 -0800 | [diff] [blame] | 5 | ** Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | ** you may not use this file except in compliance with the License. |
| 7 | ** You may obtain a copy of the License at |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 8 | ** |
JP Abgrall | 69c5c4c | 2011-02-18 14:16:59 -0800 | [diff] [blame] | 9 | ** http://www.apache.org/licenses/LICENSE-2.0 |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 10 | ** |
JP Abgrall | 69c5c4c | 2011-02-18 14:16:59 -0800 | [diff] [blame] | 11 | ** Unless required by applicable law or agreed to in writing, software |
| 12 | ** distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | ** See the License for the specific language governing permissions and |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 15 | ** limitations under the License. |
| 16 | */ |
| 17 | |
| 18 | #include <stdlib.h> |
| 19 | #include <stdio.h> |
| 20 | #include <string.h> |
| 21 | #include <unistd.h> |
| 22 | #include <errno.h> |
| 23 | |
| 24 | #include <fcntl.h> |
| 25 | |
| 26 | #include <stdarg.h> |
| 27 | #include <stddef.h> |
| 28 | |
David 'Digit' Turner | 414ff7d | 2009-05-18 17:07:46 +0200 | [diff] [blame] | 29 | #include "fdevent.h" |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 30 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 31 | |
JP Abgrall | 69c5c4c | 2011-02-18 14:16:59 -0800 | [diff] [blame] | 32 | /* !!! Do not enable DEBUG for the adb that will run as the server: |
| 33 | ** both stdout and stderr are used to communicate between the client |
| 34 | ** and server. Any extra output will cause failures. |
| 35 | */ |
| 36 | #define DEBUG 0 /* non-0 will break adb server */ |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 37 | |
| 38 | static void fatal(const char *fn, const char *fmt, ...) |
| 39 | { |
| 40 | va_list ap; |
| 41 | va_start(ap, fmt); |
| 42 | fprintf(stderr, "%s:", fn); |
| 43 | vfprintf(stderr, fmt, ap); |
| 44 | va_end(ap); |
| 45 | abort(); |
| 46 | } |
| 47 | |
| 48 | #define FATAL(x...) fatal(__FUNCTION__, x) |
| 49 | |
| 50 | #if DEBUG |
JP Abgrall | 69c5c4c | 2011-02-18 14:16:59 -0800 | [diff] [blame] | 51 | #define D(...) \ |
| 52 | do { \ |
| 53 | fprintf(stderr, "%s::%s():", __FILE__, __FUNCTION__); \ |
| 54 | fprintf(stderr, __VA_ARGS__); \ |
| 55 | } while(0) |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 56 | static void dump_fde(fdevent *fde, const char *info) |
| 57 | { |
| 58 | fprintf(stderr,"FDE #%03d %c%c%c %s\n", fde->fd, |
| 59 | fde->state & FDE_READ ? 'R' : ' ', |
| 60 | fde->state & FDE_WRITE ? 'W' : ' ', |
| 61 | fde->state & FDE_ERROR ? 'E' : ' ', |
| 62 | info); |
| 63 | } |
| 64 | #else |
JP Abgrall | 69c5c4c | 2011-02-18 14:16:59 -0800 | [diff] [blame] | 65 | #define D(...) ((void)0) |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 66 | #define dump_fde(fde, info) do { } while(0) |
| 67 | #endif |
| 68 | |
| 69 | #define FDE_EVENTMASK 0x00ff |
| 70 | #define FDE_STATEMASK 0xff00 |
| 71 | |
| 72 | #define FDE_ACTIVE 0x0100 |
| 73 | #define FDE_PENDING 0x0200 |
| 74 | #define FDE_CREATED 0x0400 |
| 75 | |
| 76 | static void fdevent_plist_enqueue(fdevent *node); |
| 77 | static void fdevent_plist_remove(fdevent *node); |
| 78 | static fdevent *fdevent_plist_dequeue(void); |
| 79 | |
| 80 | static fdevent list_pending = { |
| 81 | .next = &list_pending, |
| 82 | .prev = &list_pending, |
| 83 | }; |
| 84 | |
| 85 | static fdevent **fd_table = 0; |
| 86 | static int fd_table_max = 0; |
| 87 | |
| 88 | #ifdef CRAPTASTIC |
| 89 | //HAVE_EPOLL |
| 90 | |
| 91 | #include <sys/epoll.h> |
| 92 | |
| 93 | static int epoll_fd = -1; |
| 94 | |
| 95 | static void fdevent_init() |
| 96 | { |
| 97 | /* XXX: what's a good size for the passed in hint? */ |
| 98 | epoll_fd = epoll_create(256); |
David 'Digit' Turner | f6330a2 | 2009-05-18 17:36:28 +0200 | [diff] [blame] | 99 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 100 | if(epoll_fd < 0) { |
| 101 | perror("epoll_create() failed"); |
| 102 | exit(1); |
| 103 | } |
| 104 | |
| 105 | /* mark for close-on-exec */ |
| 106 | fcntl(epoll_fd, F_SETFD, FD_CLOEXEC); |
| 107 | } |
| 108 | |
| 109 | static void fdevent_connect(fdevent *fde) |
| 110 | { |
| 111 | struct epoll_event ev; |
| 112 | |
| 113 | memset(&ev, 0, sizeof(ev)); |
| 114 | ev.events = 0; |
| 115 | ev.data.ptr = fde; |
| 116 | |
David 'Digit' Turner | f6330a2 | 2009-05-18 17:36:28 +0200 | [diff] [blame] | 117 | #if 0 |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 118 | if(epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fde->fd, &ev)) { |
| 119 | perror("epoll_ctl() failed\n"); |
| 120 | exit(1); |
| 121 | } |
| 122 | #endif |
| 123 | } |
| 124 | |
| 125 | static void fdevent_disconnect(fdevent *fde) |
| 126 | { |
| 127 | struct epoll_event ev; |
David 'Digit' Turner | f6330a2 | 2009-05-18 17:36:28 +0200 | [diff] [blame] | 128 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 129 | memset(&ev, 0, sizeof(ev)); |
| 130 | ev.events = 0; |
| 131 | ev.data.ptr = fde; |
| 132 | |
| 133 | /* technically we only need to delete if we |
| 134 | ** were actively monitoring events, but let's |
| 135 | ** be aggressive and do it anyway, just in case |
| 136 | ** something's out of sync |
| 137 | */ |
| 138 | epoll_ctl(epoll_fd, EPOLL_CTL_DEL, fde->fd, &ev); |
| 139 | } |
| 140 | |
| 141 | static void fdevent_update(fdevent *fde, unsigned events) |
| 142 | { |
| 143 | struct epoll_event ev; |
| 144 | int active; |
David 'Digit' Turner | f6330a2 | 2009-05-18 17:36:28 +0200 | [diff] [blame] | 145 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 146 | active = (fde->state & FDE_EVENTMASK) != 0; |
David 'Digit' Turner | f6330a2 | 2009-05-18 17:36:28 +0200 | [diff] [blame] | 147 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 148 | memset(&ev, 0, sizeof(ev)); |
| 149 | ev.events = 0; |
| 150 | ev.data.ptr = fde; |
| 151 | |
| 152 | if(events & FDE_READ) ev.events |= EPOLLIN; |
| 153 | if(events & FDE_WRITE) ev.events |= EPOLLOUT; |
| 154 | if(events & FDE_ERROR) ev.events |= (EPOLLERR | EPOLLHUP); |
| 155 | |
| 156 | fde->state = (fde->state & FDE_STATEMASK) | events; |
| 157 | |
| 158 | if(active) { |
| 159 | /* we're already active. if we're changing to *no* |
| 160 | ** events being monitored, we need to delete, otherwise |
| 161 | ** we need to just modify |
| 162 | */ |
| 163 | if(ev.events) { |
| 164 | if(epoll_ctl(epoll_fd, EPOLL_CTL_MOD, fde->fd, &ev)) { |
| 165 | perror("epoll_ctl() failed\n"); |
| 166 | exit(1); |
| 167 | } |
| 168 | } else { |
| 169 | if(epoll_ctl(epoll_fd, EPOLL_CTL_DEL, fde->fd, &ev)) { |
| 170 | perror("epoll_ctl() failed\n"); |
| 171 | exit(1); |
| 172 | } |
| 173 | } |
| 174 | } else { |
| 175 | /* we're not active. if we're watching events, we need |
| 176 | ** to add, otherwise we can just do nothing |
| 177 | */ |
| 178 | if(ev.events) { |
| 179 | if(epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fde->fd, &ev)) { |
| 180 | perror("epoll_ctl() failed\n"); |
| 181 | exit(1); |
| 182 | } |
| 183 | } |
| 184 | } |
| 185 | } |
| 186 | |
| 187 | static void fdevent_process() |
| 188 | { |
| 189 | struct epoll_event events[256]; |
| 190 | fdevent *fde; |
| 191 | int i, n; |
| 192 | |
| 193 | n = epoll_wait(epoll_fd, events, 256, -1); |
| 194 | |
| 195 | if(n < 0) { |
| 196 | if(errno == EINTR) return; |
| 197 | perror("epoll_wait"); |
| 198 | exit(1); |
| 199 | } |
| 200 | |
| 201 | for(i = 0; i < n; i++) { |
| 202 | struct epoll_event *ev = events + i; |
| 203 | fde = ev->data.ptr; |
| 204 | |
| 205 | if(ev->events & EPOLLIN) { |
| 206 | fde->events |= FDE_READ; |
| 207 | } |
| 208 | if(ev->events & EPOLLOUT) { |
| 209 | fde->events |= FDE_WRITE; |
| 210 | } |
| 211 | if(ev->events & (EPOLLERR | EPOLLHUP)) { |
| 212 | fde->events |= FDE_ERROR; |
| 213 | } |
| 214 | if(fde->events) { |
| 215 | if(fde->state & FDE_PENDING) continue; |
| 216 | fde->state |= FDE_PENDING; |
| 217 | fdevent_plist_enqueue(fde); |
| 218 | } |
| 219 | } |
| 220 | } |
| 221 | |
| 222 | #else /* USE_SELECT */ |
| 223 | |
| 224 | #ifdef HAVE_WINSOCK |
| 225 | #include <winsock2.h> |
| 226 | #else |
| 227 | #include <sys/select.h> |
| 228 | #endif |
| 229 | |
| 230 | static fd_set read_fds; |
| 231 | static fd_set write_fds; |
| 232 | static fd_set error_fds; |
| 233 | |
| 234 | static int select_n = 0; |
| 235 | |
| 236 | static void fdevent_init(void) |
| 237 | { |
| 238 | FD_ZERO(&read_fds); |
| 239 | FD_ZERO(&write_fds); |
| 240 | FD_ZERO(&error_fds); |
| 241 | } |
| 242 | |
| 243 | static void fdevent_connect(fdevent *fde) |
| 244 | { |
| 245 | if(fde->fd >= select_n) { |
| 246 | select_n = fde->fd + 1; |
| 247 | } |
| 248 | } |
| 249 | |
| 250 | static void fdevent_disconnect(fdevent *fde) |
| 251 | { |
| 252 | int i, n; |
David 'Digit' Turner | f6330a2 | 2009-05-18 17:36:28 +0200 | [diff] [blame] | 253 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 254 | FD_CLR(fde->fd, &read_fds); |
| 255 | FD_CLR(fde->fd, &write_fds); |
| 256 | FD_CLR(fde->fd, &error_fds); |
| 257 | |
| 258 | for(n = 0, i = 0; i < select_n; i++) { |
| 259 | if(fd_table[i] != 0) n = i; |
| 260 | } |
| 261 | select_n = n + 1; |
| 262 | } |
| 263 | |
| 264 | static void fdevent_update(fdevent *fde, unsigned events) |
| 265 | { |
| 266 | if(events & FDE_READ) { |
| 267 | FD_SET(fde->fd, &read_fds); |
| 268 | } else { |
| 269 | FD_CLR(fde->fd, &read_fds); |
| 270 | } |
| 271 | if(events & FDE_WRITE) { |
| 272 | FD_SET(fde->fd, &write_fds); |
| 273 | } else { |
| 274 | FD_CLR(fde->fd, &write_fds); |
| 275 | } |
| 276 | if(events & FDE_ERROR) { |
| 277 | FD_SET(fde->fd, &error_fds); |
| 278 | } else { |
| 279 | FD_CLR(fde->fd, &error_fds); |
| 280 | } |
| 281 | |
JP Abgrall | 69c5c4c | 2011-02-18 14:16:59 -0800 | [diff] [blame] | 282 | fde->state = (fde->state & FDE_STATEMASK) | events; |
| 283 | } |
| 284 | |
| 285 | #if DEBUG |
| 286 | static void dump_all_fds(const char *extra_msg) |
| 287 | { |
| 288 | int i; |
| 289 | fdevent *fde; |
| 290 | // per fd: 4 digits (but really: log10(FD_SETSIZE)), 1 staus, 1 blank |
| 291 | char msg_buff[FD_SETSIZE*6 + 1], *pb=msg_buff; |
| 292 | size_t max_chars = FD_SETSIZE * 6 + 1; |
| 293 | int printed_out; |
| 294 | #define SAFE_SPRINTF(...) \ |
| 295 | do { \ |
| 296 | printed_out = snprintf(pb, max_chars, __VA_ARGS__); \ |
| 297 | if (printed_out <= 0) { \ |
| 298 | D("... snprintf failed.\n"); \ |
| 299 | return; \ |
| 300 | } \ |
| 301 | if (max_chars < (unsigned int)printed_out) { \ |
| 302 | D("... snprintf out of space.\n"); \ |
| 303 | return; \ |
| 304 | } \ |
| 305 | pb += printed_out; \ |
| 306 | max_chars -= printed_out; \ |
| 307 | } while(0) |
| 308 | |
| 309 | for(i = 0; i < select_n; i++) { |
| 310 | fde = fd_table[i]; |
| 311 | SAFE_SPRINTF("%d", i); |
| 312 | if(fde == 0) { |
| 313 | SAFE_SPRINTF("? "); |
| 314 | continue; |
| 315 | } |
| 316 | if(fcntl(i, F_GETFL, NULL) < 0) { |
| 317 | SAFE_SPRINTF("b"); |
| 318 | } |
| 319 | SAFE_SPRINTF(" "); |
| 320 | } |
| 321 | D("%s fd_table[]->fd = {%s}\n", extra_msg, msg_buff); |
| 322 | } |
| 323 | #endif |
| 324 | |
| 325 | /* Looks at fd_table[] for bad FDs and sets bit in fds. |
| 326 | ** Returns the number of bad FDs. |
| 327 | */ |
| 328 | static int fdevent_fd_check(fd_set *fds) |
| 329 | { |
| 330 | int i, n = 0; |
| 331 | fdevent *fde; |
| 332 | |
| 333 | for(i = 0; i < select_n; i++) { |
| 334 | fde = fd_table[i]; |
| 335 | if(fde == 0) continue; |
| 336 | if(fcntl(i, F_GETFL, NULL) < 0) { |
| 337 | FD_SET(i, fds); |
| 338 | n++; |
| 339 | fde->state |= FDE_DONT_CLOSE; |
| 340 | |
| 341 | } |
| 342 | } |
| 343 | return n; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 344 | } |
| 345 | |
| 346 | static void fdevent_process() |
| 347 | { |
| 348 | int i, n; |
| 349 | fdevent *fde; |
| 350 | unsigned events; |
| 351 | fd_set rfd, wfd, efd; |
JP Abgrall | 69c5c4c | 2011-02-18 14:16:59 -0800 | [diff] [blame] | 352 | struct timeval tv = { /*tv_sec=*/5, /*tv_usec=*/0 }; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 353 | |
| 354 | memcpy(&rfd, &read_fds, sizeof(fd_set)); |
| 355 | memcpy(&wfd, &write_fds, sizeof(fd_set)); |
| 356 | memcpy(&efd, &error_fds, sizeof(fd_set)); |
David 'Digit' Turner | f6330a2 | 2009-05-18 17:36:28 +0200 | [diff] [blame] | 357 | |
JP Abgrall | 69c5c4c | 2011-02-18 14:16:59 -0800 | [diff] [blame] | 358 | n = select(select_n, &rfd, &wfd, &efd, &tv); |
| 359 | |
| 360 | D("select() returned n=%d, errno=%d\n", n, n<0?errno:0); |
| 361 | |
| 362 | #if DEBUG |
| 363 | dump_all_fds("post select()"); |
| 364 | #endif |
David 'Digit' Turner | f6330a2 | 2009-05-18 17:36:28 +0200 | [diff] [blame] | 365 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 366 | if(n < 0) { |
JP Abgrall | 69c5c4c | 2011-02-18 14:16:59 -0800 | [diff] [blame] | 367 | switch(errno) { |
| 368 | case EINTR: return; |
| 369 | case EBADF: |
| 370 | // Can't trust the FD sets after an error. |
| 371 | FD_ZERO(&wfd); |
| 372 | FD_ZERO(&efd); |
| 373 | FD_ZERO(&rfd); |
| 374 | break; |
| 375 | default: |
| 376 | D("Unexpected select() error=%d\n", errno); |
| 377 | return; |
| 378 | } |
| 379 | } |
| 380 | if(n <= 0) { |
| 381 | // We fake a read, as the rest of the code assumes |
| 382 | // that errors will be detected at that point. |
| 383 | n = fdevent_fd_check(&rfd); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 384 | } |
| 385 | |
| 386 | for(i = 0; (i < select_n) && (n > 0); i++) { |
| 387 | events = 0; |
JP Abgrall | 69c5c4c | 2011-02-18 14:16:59 -0800 | [diff] [blame] | 388 | if(FD_ISSET(i, &rfd)) { events |= FDE_READ; n--; } |
| 389 | if(FD_ISSET(i, &wfd)) { events |= FDE_WRITE; n--; } |
| 390 | if(FD_ISSET(i, &efd)) { events |= FDE_ERROR; n--; } |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 391 | |
| 392 | if(events) { |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 393 | fde = fd_table[i]; |
| 394 | if(fde == 0) FATAL("missing fde for fd %d\n", i); |
| 395 | |
| 396 | fde->events |= events; |
David 'Digit' Turner | f6330a2 | 2009-05-18 17:36:28 +0200 | [diff] [blame] | 397 | |
JP Abgrall | 69c5c4c | 2011-02-18 14:16:59 -0800 | [diff] [blame] | 398 | D("got events fde->fd=%d events=%04x, state=%04x\n", |
| 399 | fde->fd, fde->events, fde->state); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 400 | if(fde->state & FDE_PENDING) continue; |
| 401 | fde->state |= FDE_PENDING; |
| 402 | fdevent_plist_enqueue(fde); |
| 403 | } |
| 404 | } |
| 405 | } |
| 406 | |
| 407 | #endif |
| 408 | |
| 409 | static void fdevent_register(fdevent *fde) |
| 410 | { |
| 411 | if(fde->fd < 0) { |
| 412 | FATAL("bogus negative fd (%d)\n", fde->fd); |
| 413 | } |
David 'Digit' Turner | f6330a2 | 2009-05-18 17:36:28 +0200 | [diff] [blame] | 414 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 415 | if(fde->fd >= fd_table_max) { |
| 416 | int oldmax = fd_table_max; |
| 417 | if(fde->fd > 32000) { |
| 418 | FATAL("bogus huuuuge fd (%d)\n", fde->fd); |
| 419 | } |
| 420 | if(fd_table_max == 0) { |
| 421 | fdevent_init(); |
| 422 | fd_table_max = 256; |
| 423 | } |
| 424 | while(fd_table_max <= fde->fd) { |
| 425 | fd_table_max *= 2; |
| 426 | } |
| 427 | fd_table = realloc(fd_table, sizeof(fdevent*) * fd_table_max); |
| 428 | if(fd_table == 0) { |
| 429 | FATAL("could not expand fd_table to %d entries\n", fd_table_max); |
| 430 | } |
| 431 | memset(fd_table + oldmax, 0, sizeof(int) * (fd_table_max - oldmax)); |
| 432 | } |
| 433 | |
| 434 | fd_table[fde->fd] = fde; |
| 435 | } |
| 436 | |
| 437 | static void fdevent_unregister(fdevent *fde) |
| 438 | { |
| 439 | if((fde->fd < 0) || (fde->fd >= fd_table_max)) { |
| 440 | FATAL("fd out of range (%d)\n", fde->fd); |
| 441 | } |
| 442 | |
| 443 | if(fd_table[fde->fd] != fde) { |
JP Abgrall | 69c5c4c | 2011-02-18 14:16:59 -0800 | [diff] [blame] | 444 | FATAL("fd_table out of sync [%d]\n", fde->fd); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 445 | } |
| 446 | |
| 447 | fd_table[fde->fd] = 0; |
| 448 | |
| 449 | if(!(fde->state & FDE_DONT_CLOSE)) { |
| 450 | dump_fde(fde, "close"); |
| 451 | close(fde->fd); |
| 452 | } |
| 453 | } |
| 454 | |
| 455 | static void fdevent_plist_enqueue(fdevent *node) |
| 456 | { |
| 457 | fdevent *list = &list_pending; |
| 458 | |
| 459 | node->next = list; |
| 460 | node->prev = list->prev; |
| 461 | node->prev->next = node; |
| 462 | list->prev = node; |
| 463 | } |
| 464 | |
| 465 | static void fdevent_plist_remove(fdevent *node) |
| 466 | { |
| 467 | node->prev->next = node->next; |
| 468 | node->next->prev = node->prev; |
| 469 | node->next = 0; |
| 470 | node->prev = 0; |
| 471 | } |
| 472 | |
| 473 | static fdevent *fdevent_plist_dequeue(void) |
| 474 | { |
| 475 | fdevent *list = &list_pending; |
| 476 | fdevent *node = list->next; |
David 'Digit' Turner | f6330a2 | 2009-05-18 17:36:28 +0200 | [diff] [blame] | 477 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 478 | if(node == list) return 0; |
David 'Digit' Turner | f6330a2 | 2009-05-18 17:36:28 +0200 | [diff] [blame] | 479 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 480 | list->next = node->next; |
| 481 | list->next->prev = list; |
| 482 | node->next = 0; |
| 483 | node->prev = 0; |
| 484 | |
| 485 | return node; |
| 486 | } |
| 487 | |
| 488 | fdevent *fdevent_create(int fd, fd_func func, void *arg) |
| 489 | { |
| 490 | fdevent *fde = (fdevent*) malloc(sizeof(fdevent)); |
| 491 | if(fde == 0) return 0; |
| 492 | fdevent_install(fde, fd, func, arg); |
| 493 | fde->state |= FDE_CREATED; |
| 494 | return fde; |
| 495 | } |
| 496 | |
| 497 | void fdevent_destroy(fdevent *fde) |
| 498 | { |
| 499 | if(fde == 0) return; |
| 500 | if(!(fde->state & FDE_CREATED)) { |
| 501 | FATAL("fde %p not created by fdevent_create()\n", fde); |
| 502 | } |
| 503 | fdevent_remove(fde); |
| 504 | } |
| 505 | |
JP Abgrall | 69c5c4c | 2011-02-18 14:16:59 -0800 | [diff] [blame] | 506 | void fdevent_install(fdevent *fde, int fd, fd_func func, void *arg) |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 507 | { |
| 508 | memset(fde, 0, sizeof(fdevent)); |
| 509 | fde->state = FDE_ACTIVE; |
| 510 | fde->fd = fd; |
| 511 | fde->func = func; |
| 512 | fde->arg = arg; |
| 513 | |
| 514 | #ifndef HAVE_WINSOCK |
| 515 | fcntl(fd, F_SETFL, O_NONBLOCK); |
| 516 | #endif |
| 517 | fdevent_register(fde); |
| 518 | dump_fde(fde, "connect"); |
| 519 | fdevent_connect(fde); |
| 520 | fde->state |= FDE_ACTIVE; |
| 521 | } |
| 522 | |
| 523 | void fdevent_remove(fdevent *fde) |
| 524 | { |
| 525 | if(fde->state & FDE_PENDING) { |
| 526 | fdevent_plist_remove(fde); |
| 527 | } |
| 528 | |
| 529 | if(fde->state & FDE_ACTIVE) { |
| 530 | fdevent_disconnect(fde); |
JP Abgrall | 69c5c4c | 2011-02-18 14:16:59 -0800 | [diff] [blame] | 531 | dump_fde(fde, "disconnect"); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 532 | fdevent_unregister(fde); |
| 533 | } |
| 534 | |
| 535 | fde->state = 0; |
| 536 | fde->events = 0; |
| 537 | } |
| 538 | |
| 539 | |
| 540 | void fdevent_set(fdevent *fde, unsigned events) |
| 541 | { |
| 542 | events &= FDE_EVENTMASK; |
David 'Digit' Turner | f6330a2 | 2009-05-18 17:36:28 +0200 | [diff] [blame] | 543 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 544 | if((fde->state & FDE_EVENTMASK) == events) return; |
David 'Digit' Turner | f6330a2 | 2009-05-18 17:36:28 +0200 | [diff] [blame] | 545 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 546 | if(fde->state & FDE_ACTIVE) { |
| 547 | fdevent_update(fde, events); |
| 548 | dump_fde(fde, "update"); |
| 549 | } |
| 550 | |
| 551 | fde->state = (fde->state & FDE_STATEMASK) | events; |
| 552 | |
| 553 | if(fde->state & FDE_PENDING) { |
| 554 | /* if we're pending, make sure |
| 555 | ** we don't signal an event that |
| 556 | ** is no longer wanted. |
| 557 | */ |
| 558 | fde->events &= (~events); |
| 559 | if(fde->events == 0) { |
| 560 | fdevent_plist_remove(fde); |
| 561 | fde->state &= (~FDE_PENDING); |
| 562 | } |
| 563 | } |
| 564 | } |
| 565 | |
| 566 | void fdevent_add(fdevent *fde, unsigned events) |
| 567 | { |
| 568 | fdevent_set( |
| 569 | fde, (fde->state & FDE_EVENTMASK) | (events & FDE_EVENTMASK)); |
| 570 | } |
| 571 | |
| 572 | void fdevent_del(fdevent *fde, unsigned events) |
| 573 | { |
| 574 | fdevent_set( |
| 575 | fde, (fde->state & FDE_EVENTMASK) & (~(events & FDE_EVENTMASK))); |
| 576 | } |
| 577 | |
| 578 | void fdevent_loop() |
| 579 | { |
| 580 | fdevent *fde; |
David 'Digit' Turner | f6330a2 | 2009-05-18 17:36:28 +0200 | [diff] [blame] | 581 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 582 | for(;;) { |
JP Abgrall | 69c5c4c | 2011-02-18 14:16:59 -0800 | [diff] [blame] | 583 | D("--- ---- waiting for events\n"); |
| 584 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 585 | fdevent_process(); |
David 'Digit' Turner | f6330a2 | 2009-05-18 17:36:28 +0200 | [diff] [blame] | 586 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 587 | while((fde = fdevent_plist_dequeue())) { |
| 588 | unsigned events = fde->events; |
| 589 | fde->events = 0; |
| 590 | fde->state &= (~FDE_PENDING); |
| 591 | dump_fde(fde, "callback"); |
| 592 | fde->func(fde->fd, events, fde->arg); |
| 593 | } |
| 594 | } |
| 595 | } |