| 1 | /* |
| 2 | * This file is part of DisOrder. |
| 3 | * Copyright (C) 2004, 2005, 2007 Richard Kettlewell |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, but |
| 11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
| 18 | * USA |
| 19 | */ |
| 20 | |
| 21 | #include <config.h> |
| 22 | |
| 23 | #include <unistd.h> |
| 24 | #include <fcntl.h> |
| 25 | #include <sys/time.h> |
| 26 | #include <sys/types.h> |
| 27 | #include <sys/resource.h> |
| 28 | #include <sys/wait.h> |
| 29 | #include <unistd.h> |
| 30 | #include <assert.h> |
| 31 | #include <signal.h> |
| 32 | #include <errno.h> |
| 33 | #include <string.h> |
| 34 | #include <limits.h> |
| 35 | #include <sys/socket.h> |
| 36 | #include <netinet/in.h> |
| 37 | #include <sys/un.h> |
| 38 | #include <stdio.h> |
| 39 | #include "event.h" |
| 40 | #include "mem.h" |
| 41 | #include "log.h" |
| 42 | #include "syscalls.h" |
| 43 | #include "printf.h" |
| 44 | #include "sink.h" |
| 45 | |
| 46 | struct timeout { |
| 47 | struct timeout *next; |
| 48 | struct timeval when; |
| 49 | ev_timeout_callback *callback; |
| 50 | void *u; |
| 51 | int resolve; |
| 52 | }; |
| 53 | |
| 54 | struct fd { |
| 55 | int fd; |
| 56 | ev_fd_callback *callback; |
| 57 | void *u; |
| 58 | const char *what; |
| 59 | }; |
| 60 | |
| 61 | struct fdmode { |
| 62 | fd_set enabled; |
| 63 | fd_set tripped; |
| 64 | int nfds, fdslots; |
| 65 | struct fd *fds; |
| 66 | int maxfd; |
| 67 | }; |
| 68 | |
| 69 | struct signal { |
| 70 | struct sigaction oldsa; |
| 71 | ev_signal_callback *callback; |
| 72 | void *u; |
| 73 | }; |
| 74 | |
| 75 | struct child { |
| 76 | pid_t pid; |
| 77 | int options; |
| 78 | ev_child_callback *callback; |
| 79 | void *u; |
| 80 | }; |
| 81 | |
| 82 | struct ev_source { |
| 83 | struct fdmode mode[ev_nmodes]; |
| 84 | struct timeout *timeouts; |
| 85 | struct signal signals[NSIG]; |
| 86 | sigset_t sigmask; |
| 87 | int escape; |
| 88 | int sigpipe[2]; |
| 89 | int nchildren, nchildslots; |
| 90 | struct child *children; |
| 91 | }; |
| 92 | |
| 93 | static const char *modenames[] = { "read", "write", "except" }; |
| 94 | |
| 95 | /* utilities ******************************************************************/ |
| 96 | |
| 97 | static inline int gt(const struct timeval *a, const struct timeval *b) { |
| 98 | if(a->tv_sec > b->tv_sec) |
| 99 | return 1; |
| 100 | if(a->tv_sec == b->tv_sec |
| 101 | && a->tv_usec > b->tv_usec) |
| 102 | return 1; |
| 103 | return 0; |
| 104 | } |
| 105 | |
| 106 | static inline int ge(const struct timeval *a, const struct timeval *b) { |
| 107 | return !gt(b, a); |
| 108 | } |
| 109 | |
| 110 | /* creation *******************************************************************/ |
| 111 | |
| 112 | ev_source *ev_new(void) { |
| 113 | ev_source *ev = xmalloc(sizeof *ev); |
| 114 | int n; |
| 115 | |
| 116 | memset(ev, 0, sizeof *ev); |
| 117 | for(n = 0; n < ev_nmodes; ++n) |
| 118 | FD_ZERO(&ev->mode[n].enabled); |
| 119 | ev->sigpipe[0] = ev->sigpipe[1] = -1; |
| 120 | sigemptyset(&ev->sigmask); |
| 121 | return ev; |
| 122 | } |
| 123 | |
| 124 | /* event loop *****************************************************************/ |
| 125 | |
| 126 | int ev_run(ev_source *ev) { |
| 127 | for(;;) { |
| 128 | struct timeval now; |
| 129 | struct timeval delta; |
| 130 | int n, mode; |
| 131 | int ret; |
| 132 | int maxfd; |
| 133 | struct timeout *t, **tt; |
| 134 | struct stat sb; |
| 135 | |
| 136 | xgettimeofday(&now, 0); |
| 137 | /* Handle timeouts. We don't want to handle any timeouts that are added |
| 138 | * while we're handling them (otherwise we'd have to break out of infinite |
| 139 | * loops, preferrably without starving better-behaved subsystems). Hence |
| 140 | * the slightly complicated two-phase approach here. */ |
| 141 | for(t = ev->timeouts; |
| 142 | t && ge(&now, &t->when); |
| 143 | t = t->next) { |
| 144 | t->resolve = 1; |
| 145 | D(("calling timeout for %ld.%ld callback %p %p", |
| 146 | (long)t->when.tv_sec, (long)t->when.tv_usec, |
| 147 | (void *)t->callback, t->u)); |
| 148 | ret = t->callback(ev, &now, t->u); |
| 149 | if(ret) |
| 150 | return ret; |
| 151 | } |
| 152 | tt = &ev->timeouts; |
| 153 | while((t = *tt)) { |
| 154 | if(t->resolve) |
| 155 | *tt = t->next; |
| 156 | else |
| 157 | tt = &t->next; |
| 158 | } |
| 159 | maxfd = 0; |
| 160 | for(mode = 0; mode < ev_nmodes; ++mode) { |
| 161 | ev->mode[mode].tripped = ev->mode[mode].enabled; |
| 162 | if(ev->mode[mode].maxfd > maxfd) |
| 163 | maxfd = ev->mode[mode].maxfd; |
| 164 | } |
| 165 | xsigprocmask(SIG_UNBLOCK, &ev->sigmask, 0); |
| 166 | do { |
| 167 | if(ev->timeouts) { |
| 168 | xgettimeofday(&now, 0); |
| 169 | delta.tv_sec = ev->timeouts->when.tv_sec - now.tv_sec; |
| 170 | delta.tv_usec = ev->timeouts->when.tv_usec - now.tv_usec; |
| 171 | if(delta.tv_usec < 0) { |
| 172 | delta.tv_usec += 1000000; |
| 173 | --delta.tv_sec; |
| 174 | } |
| 175 | if(delta.tv_sec < 0) |
| 176 | delta.tv_sec = delta.tv_usec = 0; |
| 177 | n = select(maxfd + 1, |
| 178 | &ev->mode[ev_read].tripped, |
| 179 | &ev->mode[ev_write].tripped, |
| 180 | &ev->mode[ev_except].tripped, |
| 181 | &delta); |
| 182 | } else { |
| 183 | n = select(maxfd + 1, |
| 184 | &ev->mode[ev_read].tripped, |
| 185 | &ev->mode[ev_write].tripped, |
| 186 | &ev->mode[ev_except].tripped, |
| 187 | 0); |
| 188 | } |
| 189 | } while(n < 0 && errno == EINTR); |
| 190 | xsigprocmask(SIG_BLOCK, &ev->sigmask, 0); |
| 191 | if(n < 0) { |
| 192 | error(errno, "error calling select"); |
| 193 | if(errno == EBADF) { |
| 194 | /* If there's a bad FD in the mix then check them all and log what we |
| 195 | * find, to ease debugging */ |
| 196 | for(mode = 0; mode < ev_nmodes; ++mode) { |
| 197 | for(n = 0; n < ev->mode[mode].nfds; ++n) { |
| 198 | const int fd = ev->mode[mode].fds[n].fd; |
| 199 | |
| 200 | if(FD_ISSET(fd, &ev->mode[mode].enabled) |
| 201 | && fstat(fd, &sb) < 0) |
| 202 | error(errno, "fstat %d (%s)", fd, ev->mode[mode].fds[n].what); |
| 203 | } |
| 204 | } |
| 205 | } |
| 206 | return -1; |
| 207 | } |
| 208 | if(n > 0) { |
| 209 | /* if anything deranges the meaning of an fd, or re-orders the |
| 210 | * fds[] tables, we'd better give up; such operations will |
| 211 | * therefore set @escape@. */ |
| 212 | ev->escape = 0; |
| 213 | for(mode = 0; mode < ev_nmodes && !ev->escape; ++mode) |
| 214 | for(n = 0; n < ev->mode[mode].nfds && !ev->escape; ++n) { |
| 215 | int fd = ev->mode[mode].fds[n].fd; |
| 216 | if(FD_ISSET(fd, &ev->mode[mode].tripped)) { |
| 217 | D(("calling %s fd %d callback %p %p", modenames[mode], fd, |
| 218 | (void *)ev->mode[mode].fds[n].callback, |
| 219 | ev->mode[mode].fds[n].u)); |
| 220 | ret = ev->mode[mode].fds[n].callback(ev, fd, |
| 221 | ev->mode[mode].fds[n].u); |
| 222 | if(ret) |
| 223 | return ret; |
| 224 | } |
| 225 | } |
| 226 | } |
| 227 | /* we'll pick up timeouts back round the loop */ |
| 228 | } |
| 229 | } |
| 230 | |
| 231 | /* file descriptors ***********************************************************/ |
| 232 | |
| 233 | int ev_fd(ev_source *ev, |
| 234 | ev_fdmode mode, |
| 235 | int fd, |
| 236 | ev_fd_callback *callback, |
| 237 | void *u, |
| 238 | const char *what) { |
| 239 | int n; |
| 240 | |
| 241 | D(("registering %s fd %d callback %p %p", modenames[mode], fd, |
| 242 | (void *)callback, u)); |
| 243 | assert(mode < ev_nmodes); |
| 244 | if(ev->mode[mode].nfds >= ev->mode[mode].fdslots) { |
| 245 | ev->mode[mode].fdslots = (ev->mode[mode].fdslots |
| 246 | ? 2 * ev->mode[mode].fdslots : 16); |
| 247 | D(("expanding %s fd table to %d entries", modenames[mode], |
| 248 | ev->mode[mode].fdslots)); |
| 249 | ev->mode[mode].fds = xrealloc(ev->mode[mode].fds, |
| 250 | ev->mode[mode].fdslots * sizeof (struct fd)); |
| 251 | } |
| 252 | n = ev->mode[mode].nfds++; |
| 253 | FD_SET(fd, &ev->mode[mode].enabled); |
| 254 | ev->mode[mode].fds[n].fd = fd; |
| 255 | ev->mode[mode].fds[n].callback = callback; |
| 256 | ev->mode[mode].fds[n].u = u; |
| 257 | ev->mode[mode].fds[n].what = what; |
| 258 | if(fd > ev->mode[mode].maxfd) |
| 259 | ev->mode[mode].maxfd = fd; |
| 260 | ev->escape = 1; |
| 261 | return 0; |
| 262 | } |
| 263 | |
| 264 | int ev_fd_cancel(ev_source *ev, ev_fdmode mode, int fd) { |
| 265 | int n; |
| 266 | int maxfd; |
| 267 | |
| 268 | D(("cancelling mode %s fd %d", modenames[mode], fd)); |
| 269 | /* find the right struct fd */ |
| 270 | for(n = 0; n < ev->mode[mode].nfds && fd != ev->mode[mode].fds[n].fd; ++n) |
| 271 | ; |
| 272 | assert(n < ev->mode[mode].nfds); |
| 273 | /* swap in the last fd and reduce the count */ |
| 274 | if(n != ev->mode[mode].nfds - 1) |
| 275 | ev->mode[mode].fds[n] = ev->mode[mode].fds[ev->mode[mode].nfds - 1]; |
| 276 | --ev->mode[mode].nfds; |
| 277 | /* if that was the biggest fd, find the new biggest one */ |
| 278 | if(fd == ev->mode[mode].maxfd) { |
| 279 | maxfd = 0; |
| 280 | for(n = 0; n < ev->mode[mode].nfds; ++n) |
| 281 | if(ev->mode[mode].fds[n].fd > maxfd) |
| 282 | maxfd = ev->mode[mode].fds[n].fd; |
| 283 | ev->mode[mode].maxfd = maxfd; |
| 284 | } |
| 285 | /* don't tell select about this fd any more */ |
| 286 | FD_CLR(fd, &ev->mode[mode].enabled); |
| 287 | ev->escape = 1; |
| 288 | return 0; |
| 289 | } |
| 290 | |
| 291 | int ev_fd_enable(ev_source *ev, ev_fdmode mode, int fd) { |
| 292 | D(("enabling mode %s fd %d", modenames[mode], fd)); |
| 293 | FD_SET(fd, &ev->mode[mode].enabled); |
| 294 | return 0; |
| 295 | } |
| 296 | |
| 297 | int ev_fd_disable(ev_source *ev, ev_fdmode mode, int fd) { |
| 298 | D(("disabling mode %s fd %d", modenames[mode], fd)); |
| 299 | FD_CLR(fd, &ev->mode[mode].enabled); |
| 300 | FD_CLR(fd, &ev->mode[mode].tripped); |
| 301 | return 0; |
| 302 | } |
| 303 | |
| 304 | /* timeouts *******************************************************************/ |
| 305 | |
| 306 | int ev_timeout(ev_source *ev, |
| 307 | ev_timeout_handle *handlep, |
| 308 | const struct timeval *when, |
| 309 | ev_timeout_callback *callback, |
| 310 | void *u) { |
| 311 | struct timeout *t, *p, **pp; |
| 312 | |
| 313 | D(("registering timeout at %ld.%ld callback %p %p", |
| 314 | when ? (long)when->tv_sec : 0, when ? (long)when->tv_usec : 0, |
| 315 | (void *)callback, u)); |
| 316 | t = xmalloc(sizeof *t); |
| 317 | if(when) |
| 318 | t->when = *when; |
| 319 | t->callback = callback; |
| 320 | t->u = u; |
| 321 | pp = &ev->timeouts; |
| 322 | while((p = *pp) && gt(&t->when, &p->when)) |
| 323 | pp = &p->next; |
| 324 | t->next = p; |
| 325 | *pp = t; |
| 326 | if(handlep) |
| 327 | *handlep = t; |
| 328 | return 0; |
| 329 | } |
| 330 | |
| 331 | int ev_timeout_cancel(ev_source *ev, |
| 332 | ev_timeout_handle handle) { |
| 333 | struct timeout *t = handle, *p, **pp; |
| 334 | |
| 335 | for(pp = &ev->timeouts; (p = *pp) && p != t; pp = &p->next) |
| 336 | ; |
| 337 | if(p) { |
| 338 | *pp = p->next; |
| 339 | return 0; |
| 340 | } else |
| 341 | return -1; |
| 342 | } |
| 343 | |
| 344 | /* signals ********************************************************************/ |
| 345 | |
| 346 | static int sigfd[NSIG]; |
| 347 | |
| 348 | static void sighandler(int s) { |
| 349 | unsigned char sc = s; |
| 350 | static const char errmsg[] = "error writing to signal pipe"; |
| 351 | |
| 352 | /* probably the reader has stopped listening for some reason */ |
| 353 | if(write(sigfd[s], &sc, 1) < 0) { |
| 354 | write(2, errmsg, sizeof errmsg - 1); |
| 355 | abort(); |
| 356 | } |
| 357 | } |
| 358 | |
| 359 | static int signal_read(ev_source *ev, |
| 360 | int attribute((unused)) fd, |
| 361 | void attribute((unused)) *u) { |
| 362 | unsigned char s; |
| 363 | int n; |
| 364 | int ret; |
| 365 | |
| 366 | if((n = read(ev->sigpipe[0], &s, 1)) == 1) |
| 367 | if((ret = ev->signals[s].callback(ev, s, ev->signals[s].u))) |
| 368 | return ret; |
| 369 | assert(n != 0); |
| 370 | if(n < 0 && (errno != EINTR && errno != EAGAIN)) { |
| 371 | error(errno, "error reading from signal pipe %d", ev->sigpipe[0]); |
| 372 | return -1; |
| 373 | } |
| 374 | return 0; |
| 375 | } |
| 376 | |
| 377 | static void close_sigpipe(ev_source *ev) { |
| 378 | int save_errno = errno; |
| 379 | |
| 380 | xclose(ev->sigpipe[0]); |
| 381 | xclose(ev->sigpipe[1]); |
| 382 | ev->sigpipe[0] = ev->sigpipe[1] = -1; |
| 383 | errno = save_errno; |
| 384 | } |
| 385 | |
| 386 | int ev_signal(ev_source *ev, |
| 387 | int sig, |
| 388 | ev_signal_callback *callback, |
| 389 | void *u) { |
| 390 | int n; |
| 391 | struct sigaction sa; |
| 392 | |
| 393 | D(("registering signal %d handler callback %p %p", sig, (void *)callback, u)); |
| 394 | assert(sig > 0); |
| 395 | assert(sig < NSIG); |
| 396 | assert(sig <= UCHAR_MAX); |
| 397 | if(ev->sigpipe[0] == -1) { |
| 398 | D(("creating signal pipe")); |
| 399 | xpipe(ev->sigpipe); |
| 400 | D(("signal pipe is %d, %d", ev->sigpipe[0], ev->sigpipe[1])); |
| 401 | for(n = 0; n < 2; ++n) { |
| 402 | nonblock(ev->sigpipe[n]); |
| 403 | cloexec(ev->sigpipe[n]); |
| 404 | } |
| 405 | if(ev_fd(ev, ev_read, ev->sigpipe[0], signal_read, 0, "sigpipe read")) { |
| 406 | close_sigpipe(ev); |
| 407 | return -1; |
| 408 | } |
| 409 | } |
| 410 | sigaddset(&ev->sigmask, sig); |
| 411 | xsigprocmask(SIG_BLOCK, &ev->sigmask, 0); |
| 412 | sigfd[sig] = ev->sigpipe[1]; |
| 413 | ev->signals[sig].callback = callback; |
| 414 | ev->signals[sig].u = u; |
| 415 | sa.sa_handler = sighandler; |
| 416 | sigfillset(&sa.sa_mask); |
| 417 | sa.sa_flags = SA_RESTART; |
| 418 | xsigaction(sig, &sa, &ev->signals[sig].oldsa); |
| 419 | ev->escape = 1; |
| 420 | return 0; |
| 421 | } |
| 422 | |
| 423 | int ev_signal_cancel(ev_source *ev, |
| 424 | int sig) { |
| 425 | sigset_t ss; |
| 426 | |
| 427 | xsigaction(sig, &ev->signals[sig].oldsa, 0); |
| 428 | ev->signals[sig].callback = 0; |
| 429 | ev->escape = 1; |
| 430 | sigdelset(&ev->sigmask, sig); |
| 431 | sigemptyset(&ss); |
| 432 | sigaddset(&ss, sig); |
| 433 | xsigprocmask(SIG_UNBLOCK, &ss, 0); |
| 434 | return 0; |
| 435 | } |
| 436 | |
| 437 | void ev_signal_atfork(ev_source *ev) { |
| 438 | int sig; |
| 439 | |
| 440 | if(ev->sigpipe[0] != -1) { |
| 441 | /* revert any handled signals to their original state */ |
| 442 | for(sig = 1; sig < NSIG; ++sig) { |
| 443 | if(ev->signals[sig].callback != 0) |
| 444 | xsigaction(sig, &ev->signals[sig].oldsa, 0); |
| 445 | } |
| 446 | /* and then unblock them */ |
| 447 | xsigprocmask(SIG_UNBLOCK, &ev->sigmask, 0); |
| 448 | /* don't want a copy of the signal pipe open inside the fork */ |
| 449 | xclose(ev->sigpipe[0]); |
| 450 | xclose(ev->sigpipe[1]); |
| 451 | } |
| 452 | } |
| 453 | |
| 454 | /* child processes ************************************************************/ |
| 455 | |
| 456 | static int sigchld_callback(ev_source *ev, |
| 457 | int attribute((unused)) sig, |
| 458 | void attribute((unused)) *u) { |
| 459 | struct rusage ru; |
| 460 | pid_t r; |
| 461 | int status, n, ret, revisit; |
| 462 | |
| 463 | do { |
| 464 | revisit = 0; |
| 465 | for(n = 0; n < ev->nchildren; ++n) { |
| 466 | r = wait4(ev->children[n].pid, |
| 467 | &status, |
| 468 | ev->children[n].options | WNOHANG, |
| 469 | &ru); |
| 470 | if(r > 0) { |
| 471 | ev_child_callback *c = ev->children[n].callback; |
| 472 | void *cu = ev->children[n].u; |
| 473 | |
| 474 | if(WIFEXITED(status) || WIFSIGNALED(status)) |
| 475 | ev_child_cancel(ev, r); |
| 476 | revisit = 1; |
| 477 | if((ret = c(ev, r, status, &ru, cu))) |
| 478 | return ret; |
| 479 | } else if(r < 0) { |
| 480 | /* We should "never" get an ECHILD but it can in fact happen. For |
| 481 | * instance on Linux 2.4.31, and probably other versions, if someone |
| 482 | * straces a child process and then a different child process |
| 483 | * terminates, when we wait4() the trace process we will get ECHILD |
| 484 | * because it has been reparented to strace. Obviously this is a |
| 485 | * hopeless design flaw in the tracing infrastructure, but we don't |
| 486 | * want the disorder server to bomb out because of it. So we just log |
| 487 | * the problem and ignore it. |
| 488 | */ |
| 489 | error(errno, "error calling wait4 for PID %lu (broken ptrace?)", |
| 490 | (unsigned long)ev->children[n].pid); |
| 491 | if(errno != ECHILD) |
| 492 | return -1; |
| 493 | } |
| 494 | } |
| 495 | } while(revisit); |
| 496 | return 0; |
| 497 | } |
| 498 | |
| 499 | int ev_child_setup(ev_source *ev) { |
| 500 | D(("installing SIGCHLD handler")); |
| 501 | return ev_signal(ev, SIGCHLD, sigchld_callback, 0); |
| 502 | } |
| 503 | |
| 504 | int ev_child(ev_source *ev, |
| 505 | pid_t pid, |
| 506 | int options, |
| 507 | ev_child_callback *callback, |
| 508 | void *u) { |
| 509 | int n; |
| 510 | |
| 511 | D(("registering child handling %ld options %d callback %p %p", |
| 512 | (long)pid, options, (void *)callback, u)); |
| 513 | assert(ev->signals[SIGCHLD].callback == sigchld_callback); |
| 514 | if(ev->nchildren >= ev->nchildslots) { |
| 515 | ev->nchildslots = ev->nchildslots ? 2 * ev->nchildslots : 16; |
| 516 | ev->children = xrealloc(ev->children, |
| 517 | ev->nchildslots * sizeof (struct child)); |
| 518 | } |
| 519 | n = ev->nchildren++; |
| 520 | ev->children[n].pid = pid; |
| 521 | ev->children[n].options = options; |
| 522 | ev->children[n].callback = callback; |
| 523 | ev->children[n].u = u; |
| 524 | return 0; |
| 525 | } |
| 526 | |
| 527 | int ev_child_cancel(ev_source *ev, |
| 528 | pid_t pid) { |
| 529 | int n; |
| 530 | |
| 531 | for(n = 0; n < ev->nchildren && ev->children[n].pid != pid; ++n) |
| 532 | ; |
| 533 | assert(n < ev->nchildren); |
| 534 | if(n != ev->nchildren - 1) |
| 535 | ev->children[n] = ev->children[ev->nchildren - 1]; |
| 536 | --ev->nchildren; |
| 537 | return 0; |
| 538 | } |
| 539 | |
| 540 | /* socket listeners ***********************************************************/ |
| 541 | |
| 542 | struct listen_state { |
| 543 | ev_listen_callback *callback; |
| 544 | void *u; |
| 545 | }; |
| 546 | |
| 547 | static int listen_callback(ev_source *ev, int fd, void *u) { |
| 548 | const struct listen_state *l = u; |
| 549 | int newfd; |
| 550 | union { |
| 551 | struct sockaddr_in in; |
| 552 | #if HAVE_STRUCT_SOCKADDR_IN6 |
| 553 | struct sockaddr_in6 in6; |
| 554 | #endif |
| 555 | struct sockaddr_un un; |
| 556 | struct sockaddr sa; |
| 557 | } addr; |
| 558 | socklen_t addrlen; |
| 559 | int ret; |
| 560 | |
| 561 | D(("callback for listener fd %d", fd)); |
| 562 | while((addrlen = sizeof addr), |
| 563 | (newfd = accept(fd, &addr.sa, &addrlen)) >= 0) { |
| 564 | if((ret = l->callback(ev, newfd, &addr.sa, addrlen, l->u))) |
| 565 | return ret; |
| 566 | } |
| 567 | switch(errno) { |
| 568 | case EINTR: |
| 569 | case EAGAIN: |
| 570 | break; |
| 571 | #ifdef ECONNABORTED |
| 572 | case ECONNABORTED: |
| 573 | error(errno, "error calling accept"); |
| 574 | break; |
| 575 | #endif |
| 576 | #ifdef EPROTO |
| 577 | case EPROTO: |
| 578 | /* XXX on some systems EPROTO should be fatal, but we don't know if |
| 579 | * we're running on one of them */ |
| 580 | error(errno, "error calling accept"); |
| 581 | break; |
| 582 | #endif |
| 583 | default: |
| 584 | fatal(errno, "error calling accept"); |
| 585 | break; |
| 586 | } |
| 587 | if(errno != EINTR && errno != EAGAIN) |
| 588 | error(errno, "error calling accept"); |
| 589 | return 0; |
| 590 | } |
| 591 | |
| 592 | int ev_listen(ev_source *ev, |
| 593 | int fd, |
| 594 | ev_listen_callback *callback, |
| 595 | void *u, |
| 596 | const char *what) { |
| 597 | struct listen_state *l = xmalloc(sizeof *l); |
| 598 | |
| 599 | D(("registering listener fd %d callback %p %p", fd, (void *)callback, u)); |
| 600 | l->callback = callback; |
| 601 | l->u = u; |
| 602 | return ev_fd(ev, ev_read, fd, listen_callback, l, what); |
| 603 | } |
| 604 | |
| 605 | int ev_listen_cancel(ev_source *ev, int fd) { |
| 606 | D(("cancelling listener fd %d", fd)); |
| 607 | return ev_fd_cancel(ev, ev_read, fd); |
| 608 | } |
| 609 | |
| 610 | /* buffer *********************************************************************/ |
| 611 | |
| 612 | struct buffer { |
| 613 | char *base, *start, *end, *top; |
| 614 | }; |
| 615 | |
| 616 | /* make sure there is @bytes@ available at @b->end@ */ |
| 617 | static void buffer_space(struct buffer *b, size_t bytes) { |
| 618 | D(("buffer_space %p %p %p %p want %lu", |
| 619 | (void *)b->base, (void *)b->start, (void *)b->end, (void *)b->top, |
| 620 | (unsigned long)bytes)); |
| 621 | if(b->start == b->end) |
| 622 | b->start = b->end = b->base; |
| 623 | if((size_t)(b->top - b->end) < bytes) { |
| 624 | if((size_t)((b->top - b->end) + (b->start - b->base)) < bytes) { |
| 625 | size_t newspace = b->end - b->start + bytes, n; |
| 626 | char *newbase; |
| 627 | |
| 628 | for(n = 16; n < newspace; n *= 2) |
| 629 | ; |
| 630 | newbase = xmalloc_noptr(n); |
| 631 | memcpy(newbase, b->start, b->end - b->start); |
| 632 | b->base = newbase; |
| 633 | b->end = newbase + (b->end - b->start); |
| 634 | b->top = newbase + n; |
| 635 | b->start = newbase; /* must be last */ |
| 636 | } else { |
| 637 | memmove(b->base, b->start, b->end - b->start); |
| 638 | b->end = b->base + (b->end - b->start); |
| 639 | b->start = b->base; |
| 640 | } |
| 641 | } |
| 642 | D(("result %p %p %p %p", |
| 643 | (void *)b->base, (void *)b->start, (void *)b->end, (void *)b->top)); |
| 644 | } |
| 645 | |
| 646 | /* buffered writer ************************************************************/ |
| 647 | |
| 648 | struct ev_writer { |
| 649 | struct sink s; |
| 650 | struct buffer b; |
| 651 | int fd; |
| 652 | int eof; |
| 653 | ev_error_callback *callback; |
| 654 | void *u; |
| 655 | ev_source *ev; |
| 656 | }; |
| 657 | |
| 658 | static int writer_callback(ev_source *ev, int fd, void *u) { |
| 659 | ev_writer *w = u; |
| 660 | int n; |
| 661 | |
| 662 | n = write(fd, w->b.start, w->b.end - w->b.start); |
| 663 | D(("callback for writer fd %d, %ld bytes, n=%d, errno=%d", |
| 664 | fd, (long)(w->b.end - w->b.start), n, errno)); |
| 665 | if(n >= 0) { |
| 666 | w->b.start += n; |
| 667 | if(w->b.start == w->b.end) { |
| 668 | if(w->eof) { |
| 669 | ev_fd_cancel(ev, ev_write, fd); |
| 670 | return w->callback(ev, fd, 0, w->u); |
| 671 | } else |
| 672 | ev_fd_disable(ev, ev_write, fd); |
| 673 | } |
| 674 | } else { |
| 675 | switch(errno) { |
| 676 | case EINTR: |
| 677 | case EAGAIN: |
| 678 | break; |
| 679 | default: |
| 680 | ev_fd_cancel(ev, ev_write, fd); |
| 681 | return w->callback(ev, fd, errno, w->u); |
| 682 | } |
| 683 | } |
| 684 | return 0; |
| 685 | } |
| 686 | |
| 687 | static int ev_writer_write(struct sink *sk, const void *s, int n) { |
| 688 | ev_writer *w = (ev_writer *)sk; |
| 689 | |
| 690 | buffer_space(&w->b, n); |
| 691 | if(w->b.start == w->b.end) |
| 692 | ev_fd_enable(w->ev, ev_write, w->fd); |
| 693 | memcpy(w->b.end, s, n); |
| 694 | w->b.end += n; |
| 695 | return 0; |
| 696 | } |
| 697 | |
| 698 | ev_writer *ev_writer_new(ev_source *ev, |
| 699 | int fd, |
| 700 | ev_error_callback *callback, |
| 701 | void *u, |
| 702 | const char *what) { |
| 703 | ev_writer *w = xmalloc(sizeof *w); |
| 704 | |
| 705 | D(("registering writer fd %d callback %p %p", fd, (void *)callback, u)); |
| 706 | w->s.write = ev_writer_write; |
| 707 | w->fd = fd; |
| 708 | w->callback = callback; |
| 709 | w->u = u; |
| 710 | w->ev = ev; |
| 711 | if(ev_fd(ev, ev_write, fd, writer_callback, w, what)) |
| 712 | return 0; |
| 713 | ev_fd_disable(ev, ev_write, fd); |
| 714 | return w; |
| 715 | } |
| 716 | |
| 717 | struct sink *ev_writer_sink(ev_writer *w) { |
| 718 | return &w->s; |
| 719 | } |
| 720 | |
| 721 | static int writer_shutdown(ev_source *ev, |
| 722 | const attribute((unused)) struct timeval *now, |
| 723 | void *u) { |
| 724 | ev_writer *w = u; |
| 725 | |
| 726 | return w->callback(ev, w->fd, 0, w->u); |
| 727 | } |
| 728 | |
| 729 | int ev_writer_close(ev_writer *w) { |
| 730 | D(("close writer fd %d", w->fd)); |
| 731 | w->eof = 1; |
| 732 | if(w->b.start == w->b.end) { |
| 733 | /* we're already finished */ |
| 734 | ev_fd_cancel(w->ev, ev_write, w->fd); |
| 735 | return ev_timeout(w->ev, 0, 0, writer_shutdown, w); |
| 736 | } |
| 737 | return 0; |
| 738 | } |
| 739 | |
| 740 | int ev_writer_cancel(ev_writer *w) { |
| 741 | D(("cancel writer fd %d", w->fd)); |
| 742 | return ev_fd_cancel(w->ev, ev_write, w->fd); |
| 743 | } |
| 744 | |
| 745 | int ev_writer_flush(ev_writer *w) { |
| 746 | return writer_callback(w->ev, w->fd, w); |
| 747 | } |
| 748 | |
| 749 | /* buffered reader ************************************************************/ |
| 750 | |
| 751 | struct ev_reader { |
| 752 | struct buffer b; |
| 753 | int fd; |
| 754 | ev_reader_callback *callback; |
| 755 | ev_error_callback *error_callback; |
| 756 | void *u; |
| 757 | ev_source *ev; |
| 758 | int eof; |
| 759 | }; |
| 760 | |
| 761 | static int reader_callback(ev_source *ev, int fd, void *u) { |
| 762 | ev_reader *r = u; |
| 763 | int n; |
| 764 | |
| 765 | buffer_space(&r->b, 1); |
| 766 | n = read(fd, r->b.end, r->b.top - r->b.end); |
| 767 | D(("read fd %d buffer %d returned %d errno %d", |
| 768 | fd, (int)(r->b.top - r->b.end), n, errno)); |
| 769 | if(n > 0) { |
| 770 | r->b.end += n; |
| 771 | return r->callback(ev, r, fd, r->b.start, r->b.end - r->b.start, 0, r->u); |
| 772 | } else if(n == 0) { |
| 773 | r->eof = 1; |
| 774 | ev_fd_cancel(ev, ev_read, fd); |
| 775 | return r->callback(ev, r, fd, r->b.start, r->b.end - r->b.start, 1, r->u); |
| 776 | } else { |
| 777 | switch(errno) { |
| 778 | case EINTR: |
| 779 | case EAGAIN: |
| 780 | break; |
| 781 | default: |
| 782 | ev_fd_cancel(ev, ev_read, fd); |
| 783 | return r->error_callback(ev, fd, errno, r->u); |
| 784 | } |
| 785 | } |
| 786 | return 0; |
| 787 | } |
| 788 | |
| 789 | ev_reader *ev_reader_new(ev_source *ev, |
| 790 | int fd, |
| 791 | ev_reader_callback *callback, |
| 792 | ev_error_callback *error_callback, |
| 793 | void *u, |
| 794 | const char *what) { |
| 795 | ev_reader *r = xmalloc(sizeof *r); |
| 796 | |
| 797 | D(("registering reader fd %d callback %p %p %p", |
| 798 | fd, (void *)callback, (void *)error_callback, u)); |
| 799 | r->fd = fd; |
| 800 | r->callback = callback; |
| 801 | r->error_callback = error_callback; |
| 802 | r->u = u; |
| 803 | r->ev = ev; |
| 804 | if(ev_fd(ev, ev_read, fd, reader_callback, r, what)) |
| 805 | return 0; |
| 806 | return r; |
| 807 | } |
| 808 | |
| 809 | void ev_reader_buffer(ev_reader *r, size_t nbytes) { |
| 810 | buffer_space(&r->b, nbytes - (r->b.end - r->b.start)); |
| 811 | } |
| 812 | |
| 813 | void ev_reader_consume(ev_reader *r, size_t n) { |
| 814 | r->b.start += n; |
| 815 | } |
| 816 | |
| 817 | int ev_reader_cancel(ev_reader *r) { |
| 818 | D(("cancel reader fd %d", r->fd)); |
| 819 | return ev_fd_cancel(r->ev, ev_read, r->fd); |
| 820 | } |
| 821 | |
| 822 | int ev_reader_disable(ev_reader *r) { |
| 823 | D(("disable reader fd %d", r->fd)); |
| 824 | return r->eof ? 0 : ev_fd_disable(r->ev, ev_read, r->fd); |
| 825 | } |
| 826 | |
| 827 | static int reader_continuation(ev_source attribute((unused)) *ev, |
| 828 | const attribute((unused)) struct timeval *now, |
| 829 | void *u) { |
| 830 | ev_reader *r = u; |
| 831 | |
| 832 | D(("reader continuation callback fd %d", r->fd)); |
| 833 | if(ev_fd_enable(r->ev, ev_read, r->fd)) return -1; |
| 834 | return r->callback(ev, r, r->fd, r->b.start, r->b.end - r->b.start, r->eof, r->u); |
| 835 | } |
| 836 | |
| 837 | int ev_reader_incomplete(ev_reader *r) { |
| 838 | if(ev_fd_disable(r->ev, ev_read, r->fd)) return -1; |
| 839 | return ev_timeout(r->ev, 0, 0, reader_continuation, r); |
| 840 | } |
| 841 | |
| 842 | static int reader_enabled(ev_source *ev, |
| 843 | const attribute((unused)) struct timeval *now, |
| 844 | void *u) { |
| 845 | ev_reader *r = u; |
| 846 | |
| 847 | D(("reader enabled callback fd %d", r->fd)); |
| 848 | return r->callback(ev, r, r->fd, r->b.start, r->b.end - r->b.start, r->eof, r->u); |
| 849 | } |
| 850 | |
| 851 | int ev_reader_enable(ev_reader *r) { |
| 852 | D(("enable reader fd %d", r->fd)); |
| 853 | return ((r->eof ? 0 : ev_fd_enable(r->ev, ev_read, r->fd)) |
| 854 | || ev_timeout(r->ev, 0, 0, reader_enabled, r)) ? -1 : 0; |
| 855 | } |
| 856 | |
| 857 | /* |
| 858 | Local Variables: |
| 859 | c-basic-offset:2 |
| 860 | comment-column:40 |
| 861 | fill-column:79 |
| 862 | End: |
| 863 | */ |