lib/lws-plat-unix.c

   1 #include "private-libwebsockets.h"
   2
   3 #include <pwd.h>
   4 #include <grp.h>
   5
   6 #ifdef LWS_WITH_PLUGINS
   7 #include <dlfcn.h>
   8 #endif
   9 #include <dirent.h>
  10
  11
  12 /*
  13  * included from libwebsockets.c for unix builds
  14  */
  15
  16 unsigned long long time_in_microseconds(void)
  17 {
  18         struct timeval tv;
  19         gettimeofday(&tv, NULL);
  20         return ((unsigned long long)tv.tv_sec * 1000000LL) + tv.tv_usec;
  21 }
  22
  23 LWS_VISIBLE int
  24 lws_get_random(struct lws_context *context, void *buf, int len)
  25 {
  26         return read(context->fd_random, (char *)buf, len);
  27 }
  28
  29 LWS_VISIBLE int
  30 lws_send_pipe_choked(struct lws *wsi)
  31 {
  32         struct lws_pollfd fds;
  33
  34         /* treat the fact we got a truncated send pending as if we're choked */
  35         if (wsi->trunc_len)
  36                 return 1;
  37
  38         fds.fd = wsi->desc.sockfd;
  39         fds.events = POLLOUT;
  40         fds.revents = 0;
  41
  42         if (poll(&fds, 1, 0) != 1)
  43                 return 1;
  44
  45         if ((fds.revents & POLLOUT) == 0)
  46                 return 1;
  47
  48         /* okay to send another packet without blocking */
  49
  50         return 0;
  51 }
  52
  53 LWS_VISIBLE int
  54 lws_poll_listen_fd(struct lws_pollfd *fd)
  55 {
  56         return poll(fd, 1, 0);
  57 }
  58
  59 LWS_VISIBLE void
  60 lws_cancel_service_pt(struct lws *wsi)
  61 {
  62         struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
  63         char buf = 0;
  64
  65         if (write(pt->dummy_pipe_fds[1], &buf, sizeof(buf)) != 1)
  66                 lwsl_err("Cannot write to dummy pipe");
  67 }
  68
  69 LWS_VISIBLE void
  70 lws_cancel_service(struct lws_context *context)
  71 {
  72         struct lws_context_per_thread *pt = &context->pt[0];
  73         char buf = 0, m = context->count_threads;
  74
  75         while (m--) {
  76                 if (write(pt->dummy_pipe_fds[1], &buf, sizeof(buf)) != 1)
  77                         lwsl_err("Cannot write to dummy pipe");
  78                 pt++;
  79         }
  80 }
  81
  82 LWS_VISIBLE void lwsl_emit_syslog(int level, const char *line)
  83 {
  84         int syslog_level = LOG_DEBUG;
  85
  86         switch (level) {
  87         case LLL_ERR:
  88                 syslog_level = LOG_ERR;
  89                 break;
  90         case LLL_WARN:
  91                 syslog_level = LOG_WARNING;
  92                 break;
  93         case LLL_NOTICE:
  94                 syslog_level = LOG_NOTICE;
  95                 break;
  96         case LLL_INFO:
  97                 syslog_level = LOG_INFO;
  98                 break;
  99         }
 100         syslog(syslog_level, "%s", line);
 101 }
 102
 103 LWS_VISIBLE LWS_EXTERN int
 104 _lws_plat_service_tsi(struct lws_context *context, int timeout_ms, int tsi)
 105 {
 106         struct lws_context_per_thread *pt;
 107         int n = -1, m, c;
 108         char buf;
 109
 110         /* stay dead once we are dead */
 111
 112         if (!context || !context->vhost_list)
 113                 return 1;
 114
 115         pt = &context->pt[tsi];
 116
 117         if (timeout_ms < 0)
 118                 goto faked_service;
 119
 120         lws_libev_run(context, tsi);
 121         lws_libuv_run(context, tsi);
 122         lws_libevent_run(context, tsi);
 123
 124         if (!context->service_tid_detected) {
 125                 struct lws _lws;
 126
 127                 memset(&_lws, 0, sizeof(_lws));
 128                 _lws.context = context;
 129
 130                 context->service_tid_detected =
 131                         context->vhost_list->protocols[0].callback(
 132                         &_lws, LWS_CALLBACK_GET_THREAD_ID, NULL, NULL, 0);
 133         }
 134         context->service_tid = context->service_tid_detected;
 135
 136         /*
 137          * is there anybody with pending stuff that needs service forcing?
 138          */
 139         if (!lws_service_adjust_timeout(context, 1, tsi)) {
 140                 /* -1 timeout means just do forced service */
 141                 _lws_plat_service_tsi(context, -1, pt->tid);
 142                 /* still somebody left who wants forced service? */
 143                 if (!lws_service_adjust_timeout(context, 1, pt->tid))
 144                         /* yes... come back again quickly */
 145                         timeout_ms = 0;
 146         }
 147
 148         n = poll(pt->fds, pt->fds_count, timeout_ms);
 149
 150 #ifdef LWS_OPENSSL_SUPPORT
 151         if (!pt->rx_draining_ext_list &&
 152             !lws_ssl_anybody_has_buffered_read_tsi(context, tsi) && !n) {
 153 #else
 154         if (!pt->rx_draining_ext_list && !n) /* poll timeout */ {
 155 #endif
 156                 lws_service_fd_tsi(context, NULL, tsi);
 157                 return 0;
 158         }
 159
 160 faked_service:
 161         m = lws_service_flag_pending(context, tsi);
 162         if (m)
 163                 c = -1; /* unknown limit */
 164         else
 165                 if (n < 0) {
 166                         if (LWS_ERRNO != LWS_EINTR)
 167                                 return -1;
 168                         return 0;
 169                 } else
 170                         c = n;
 171
 172         /* any socket with events to service? */
 173         for (n = 0; n < pt->fds_count && c; n++) {
 174                 if (!pt->fds[n].revents)
 175                         continue;
 176
 177                 c--;
 178
 179                 if (pt->fds[n].fd == pt->dummy_pipe_fds[0]) {
 180                         if (read(pt->fds[n].fd, &buf, 1) != 1)
 181                                 lwsl_err("Cannot read from dummy pipe.");
 182                         continue;
 183                 }
 184
 185                 m = lws_service_fd_tsi(context, &pt->fds[n], tsi);
 186                 if (m < 0)
 187                         return -1;
 188                 /* if something closed, retry this slot */
 189                 if (m)
 190                         n--;
 191         }
 192
 193         return 0;
 194 }
 195
 196 LWS_VISIBLE int
 197 lws_plat_check_connection_error(struct lws *wsi)
 198 {
 199         return 0;
 200 }
 201
 202 LWS_VISIBLE int
 203 lws_plat_service(struct lws_context *context, int timeout_ms)
 204 {
 205         return _lws_plat_service_tsi(context, timeout_ms, 0);
 206 }
 207
 208 LWS_VISIBLE int
 209 lws_plat_set_socket_options(struct lws_vhost *vhost, int fd)
 210 {
 211         int optval = 1;
 212         socklen_t optlen = sizeof(optval);
 213
 214 #if defined(__APPLE__) || \
 215     defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || \
 216     defined(__NetBSD__) || \
 217     defined(__OpenBSD__)
 218         struct protoent *tcp_proto;
 219 #endif
 220
 221         if (vhost->ka_time) {
 222                 /* enable keepalive on this socket */
 223                 optval = 1;
 224                 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE,
 225                                (const void *)&optval, optlen) < 0)
 226                         return 1;
 227
 228 #if defined(__APPLE__) || \
 229     defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || \
 230     defined(__NetBSD__) || \
 231         defined(__CYGWIN__) || defined(__OpenBSD__) || defined (__sun)
 232
 233                 /*
 234                  * didn't find a way to set these per-socket, need to
 235                  * tune kernel systemwide values
 236                  */
 237 #else
 238                 /* set the keepalive conditions we want on it too */
 239                 optval = vhost->ka_time;
 240                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE,
 241                                (const void *)&optval, optlen) < 0)
 242                         return 1;
 243
 244                 optval = vhost->ka_interval;
 245                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL,
 246                                (const void *)&optval, optlen) < 0)
 247                         return 1;
 248
 249                 optval = vhost->ka_probes;
 250                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT,
 251                                (const void *)&optval, optlen) < 0)
 252                         return 1;
 253 #endif
 254         }
 255
 256         /* Disable Nagle */
 257         optval = 1;
 258 #if defined (__sun)
 259         if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (const void *)&optval, optlen) < 0)
 260                 return 1;
 261 #elif !defined(__APPLE__) && \
 262       !defined(__FreeBSD__) && !defined(__FreeBSD_kernel__) &&        \
 263       !defined(__NetBSD__) && \
 264       !defined(__OpenBSD__)
 265         if (setsockopt(fd, SOL_TCP, TCP_NODELAY, (const void *)&optval, optlen) < 0)
 266                 return 1;
 267 #else
 268         tcp_proto = getprotobyname("TCP");
 269         if (setsockopt(fd, tcp_proto->p_proto, TCP_NODELAY, &optval, optlen) < 0)
 270                 return 1;
 271 #endif
 272
 273         /* We are nonblocking... */
 274         if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
 275                 return 1;
 276
 277         return 0;
 278 }
 279
 280 LWS_VISIBLE void
 281 lws_plat_drop_app_privileges(struct lws_context_creation_info *info)
 282 {
 283         if (info->gid != -1)
 284                 if (setgid(info->gid))
 285                         lwsl_warn("setgid: %s\n", strerror(LWS_ERRNO));
 286
 287         if (info->uid != -1) {
 288                 struct passwd *p = getpwuid(info->uid);
 289
 290                 if (p) {
 291                         initgroups(p->pw_name, info->gid);
 292                         if (setuid(info->uid))
 293                                 lwsl_warn("setuid: %s\n", strerror(LWS_ERRNO));
 294                         else
 295                                 lwsl_notice("Set privs to user '%s'\n", p->pw_name);
 296                 } else
 297                         lwsl_warn("getpwuid: unable to find uid %d", info->uid);
 298         }
 299 }
 300
 301 #ifdef LWS_WITH_PLUGINS
 302
 303 #if defined(LWS_USE_LIBUV) && UV_VERSION_MAJOR > 0
 304
 305 /* libuv.c implements these in a cross-platform way */
 306
 307 #else
 308
 309 static int filter(const struct dirent *ent)
 310 {
 311         if (!strcmp(ent->d_name, ".") || !strcmp(ent->d_name, ".."))
 312                 return 0;
 313
 314         return 1;
 315 }
 316
 317 LWS_VISIBLE int
 318 lws_plat_plugins_init(struct lws_context * context, const char * const *d)
 319 {
 320         struct lws_plugin_capability lcaps;
 321         struct lws_plugin *plugin;
 322         lws_plugin_init_func initfunc;
 323         struct dirent **namelist;
 324         int n, i, m, ret = 0;
 325         char path[256];
 326         void *l;
 327
 328         lwsl_notice("  Plugins:\n");
 329
 330         while (d && *d) {
 331                 n = scandir(*d, &namelist, filter, alphasort);
 332                 if (n < 0) {
 333                         lwsl_err("Scandir on %s failed\n", *d);
 334                         return 1;
 335                 }
 336
 337                 for (i = 0; i < n; i++) {
 338                         if (strlen(namelist[i]->d_name) < 7)
 339                                 goto inval;
 340
 341                         lwsl_notice("   %s\n", namelist[i]->d_name);
 342
 343                         lws_snprintf(path, sizeof(path) - 1, "%s/%s", *d,
 344                                  namelist[i]->d_name);
 345                         l = dlopen(path, RTLD_NOW);
 346                         if (!l) {
 347                                 lwsl_err("Error loading DSO: %s\n", dlerror());
 348                                 while (i++ < n)
 349                                         free(namelist[i]);
 350                                 goto bail;
 351                         }
 352                         /* we could open it, can we get his init function? */
 353                         m = lws_snprintf(path, sizeof(path) - 1, "init_%s",
 354                                      namelist[i]->d_name + 3 /* snip lib... */);
 355                         path[m - 3] = '\0'; /* snip the .so */
 356                         initfunc = dlsym(l, path);
 357                         if (!initfunc) {
 358                                 lwsl_err("Failed to get init on %s: %s",
 359                                                 namelist[i]->d_name, dlerror());
 360                                 dlclose(l);
 361                         }
 362                         lcaps.api_magic = LWS_PLUGIN_API_MAGIC;
 363                         m = initfunc(context, &lcaps);
 364                         if (m) {
 365                                 lwsl_err("Initializing %s failed %d\n",
 366                                         namelist[i]->d_name, m);
 367                                 dlclose(l);
 368                                 goto skip;
 369                         }
 370
 371                         plugin = lws_malloc(sizeof(*plugin));
 372                         if (!plugin) {
 373                                 lwsl_err("OOM\n");
 374                                 goto bail;
 375                         }
 376                         plugin->list = context->plugin_list;
 377                         context->plugin_list = plugin;
 378                         strncpy(plugin->name, namelist[i]->d_name, sizeof(plugin->name) - 1);
 379                         plugin->name[sizeof(plugin->name) - 1] = '\0';
 380                         plugin->l = l;
 381                         plugin->caps = lcaps;
 382                         context->plugin_protocol_count += lcaps.count_protocols;
 383                         context->plugin_extension_count += lcaps.count_extensions;
 384
 385                         free(namelist[i]);
 386                         continue;
 387
 388         skip:
 389                         dlclose(l);
 390         inval:
 391                         free(namelist[i]);
 392                 }
 393                 free(namelist);
 394                 d++;
 395         }
 396
 397 bail:
 398         free(namelist);
 399
 400         return ret;
 401 }
 402
 403 LWS_VISIBLE int
 404 lws_plat_plugins_destroy(struct lws_context * context)
 405 {
 406         struct lws_plugin *plugin = context->plugin_list, *p;
 407         lws_plugin_destroy_func func;
 408         char path[256];
 409         int m;
 410
 411         if (!plugin)
 412                 return 0;
 413
 414         lwsl_notice("%s\n", __func__);
 415
 416         while (plugin) {
 417                 p = plugin;
 418                 m = lws_snprintf(path, sizeof(path) - 1, "destroy_%s", plugin->name + 3);
 419                 path[m - 3] = '\0';
 420                 func = dlsym(plugin->l, path);
 421                 if (!func) {
 422                         lwsl_err("Failed to get destroy on %s: %s",
 423                                         plugin->name, dlerror());
 424                         goto next;
 425                 }
 426                 m = func(context);
 427                 if (m)
 428                         lwsl_err("Initializing %s failed %d\n",
 429                                 plugin->name, m);
 430 next:
 431                 dlclose(p->l);
 432                 plugin = p->list;
 433                 p->list = NULL;
 434                 free(p);
 435         }
 436
 437         context->plugin_list = NULL;
 438
 439         return 0;
 440 }
 441
 442 #endif
 443 #endif
 444
 445
 446 #if 0
 447 static void
 448 sigabrt_handler(int x)
 449 {
 450         printf("%s\n", __func__);
 451         //*(char *)0 = 0;
 452 }
 453 #endif
 454
 455 LWS_VISIBLE int
 456 lws_plat_context_early_init(void)
 457 {
 458 #if !defined(LWS_AVOID_SIGPIPE_IGN)
 459         signal(SIGPIPE, SIG_IGN);
 460 #endif
 461
 462 //      signal(SIGABRT, sigabrt_handler);
 463
 464         return 0;
 465 }
 466
 467 LWS_VISIBLE void
 468 lws_plat_context_early_destroy(struct lws_context *context)
 469 {
 470 }
 471
 472 LWS_VISIBLE void
 473 lws_plat_context_late_destroy(struct lws_context *context)
 474 {
 475         struct lws_context_per_thread *pt = &context->pt[0];
 476         int m = context->count_threads;
 477
 478 #ifdef LWS_WITH_PLUGINS
 479         if (context->plugin_list)
 480                 lws_plat_plugins_destroy(context);
 481 #endif
 482
 483         if (context->lws_lookup)
 484                 lws_free(context->lws_lookup);
 485
 486         while (m--) {
 487                 if (pt->dummy_pipe_fds[0])
 488                         close(pt->dummy_pipe_fds[0]);
 489                 if (pt->dummy_pipe_fds[1])
 490                         close(pt->dummy_pipe_fds[1]);
 491                 pt++;
 492         }
 493         if (!context->fd_random)
 494                 lwsl_err("ZERO RANDOM FD\n");
 495         if (context->fd_random != LWS_INVALID_FILE)
 496                 close(context->fd_random);
 497 }
 498
 499 /* cast a struct sockaddr_in6 * into addr for ipv6 */
 500
 501 LWS_VISIBLE int
 502 lws_interface_to_sa(int ipv6, const char *ifname, struct sockaddr_in *addr,
 503                     size_t addrlen)
 504 {
 505         int rc = -1;
 506
 507         struct ifaddrs *ifr;
 508         struct ifaddrs *ifc;
 509 #ifdef LWS_USE_IPV6
 510         struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
 511 #endif
 512
 513         getifaddrs(&ifr);
 514         for (ifc = ifr; ifc != NULL && rc; ifc = ifc->ifa_next) {
 515                 if (!ifc->ifa_addr)
 516                         continue;
 517
 518                 lwsl_info(" interface %s vs %s\n", ifc->ifa_name, ifname);
 519
 520                 if (strcmp(ifc->ifa_name, ifname))
 521                         continue;
 522
 523                 switch (ifc->ifa_addr->sa_family) {
 524                 case AF_INET:
 525 #ifdef LWS_USE_IPV6
 526                         if (ipv6) {
 527                                 /* map IPv4 to IPv6 */
 528                                 bzero((char *)&addr6->sin6_addr,
 529                                                 sizeof(struct in6_addr));
 530                                 addr6->sin6_addr.s6_addr[10] = 0xff;
 531                                 addr6->sin6_addr.s6_addr[11] = 0xff;
 532                                 memcpy(&addr6->sin6_addr.s6_addr[12],
 533                                         &((struct sockaddr_in *)ifc->ifa_addr)->sin_addr,
 534                                                         sizeof(struct in_addr));
 535                         } else
 536 #endif
 537                                 memcpy(addr,
 538                                         (struct sockaddr_in *)ifc->ifa_addr,
 539                                                     sizeof(struct sockaddr_in));
 540                         break;
 541 #ifdef LWS_USE_IPV6
 542                 case AF_INET6:
 543                         memcpy(&addr6->sin6_addr,
 544                           &((struct sockaddr_in6 *)ifc->ifa_addr)->sin6_addr,
 545                                                        sizeof(struct in6_addr));
 546                         break;
 547 #endif
 548                 default:
 549                         continue;
 550                 }
 551                 rc = 0;
 552         }
 553
 554         freeifaddrs(ifr);
 555
 556         if (rc == -1) {
 557                 /* check if bind to IP address */
 558 #ifdef LWS_USE_IPV6
 559                 if (inet_pton(AF_INET6, ifname, &addr6->sin6_addr) == 1)
 560                         rc = 0;
 561                 else
 562 #endif
 563                 if (inet_pton(AF_INET, ifname, &addr->sin_addr) == 1)
 564                         rc = 0;
 565         }
 566
 567         return rc;
 568 }
 569
 570 LWS_VISIBLE void
 571 lws_plat_insert_socket_into_fds(struct lws_context *context, struct lws *wsi)
 572 {
 573         struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
 574
 575         lws_libev_io(wsi, LWS_EV_START | LWS_EV_READ);
 576         lws_libuv_io(wsi, LWS_EV_START | LWS_EV_READ);
 577         lws_libevent_io(wsi, LWS_EV_START | LWS_EV_READ);
 578
 579         pt->fds[pt->fds_count++].revents = 0;
 580 }
 581
 582 LWS_VISIBLE void
 583 lws_plat_delete_socket_from_fds(struct lws_context *context,
 584                                                 struct lws *wsi, int m)
 585 {
 586         struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
 587
 588         lws_libev_io(wsi, LWS_EV_STOP | LWS_EV_READ | LWS_EV_WRITE);
 589         lws_libuv_io(wsi, LWS_EV_STOP | LWS_EV_READ | LWS_EV_WRITE);
 590         lws_libevent_io(wsi, LWS_EV_STOP | LWS_EV_READ | LWS_EV_WRITE);
 591
 592         pt->fds_count--;
 593 }
 594
 595 LWS_VISIBLE void
 596 lws_plat_service_periodic(struct lws_context *context)
 597 {
 598         /* if our parent went down, don't linger around */
 599         if (context->started_with_parent &&
 600             kill(context->started_with_parent, 0) < 0)
 601                 kill(getpid(), SIGTERM);
 602 }
 603
 604 LWS_VISIBLE int
 605 lws_plat_change_pollfd(struct lws_context *context,
 606                       struct lws *wsi, struct lws_pollfd *pfd)
 607 {
 608         return 0;
 609 }
 610
 611 LWS_VISIBLE const char *
 612 lws_plat_inet_ntop(int af, const void *src, char *dst, int cnt)
 613 {
 614         return inet_ntop(af, src, dst, cnt);
 615 }
 616
 617 LWS_VISIBLE lws_fop_fd_t
 618 _lws_plat_file_open(const struct lws_plat_file_ops *fops, const char *filename,
 619                     const char *vpath, lws_fop_flags_t *flags)
 620 {
 621         struct stat stat_buf;
 622         int ret = open(filename, (*flags) & LWS_FOP_FLAGS_MASK, 0664);
 623         lws_fop_fd_t fop_fd;
 624
 625         if (ret < 0)
 626                 return NULL;
 627
 628         if (fstat(ret, &stat_buf) < 0)
 629                 goto bail;
 630
 631         fop_fd = malloc(sizeof(*fop_fd));
 632         if (!fop_fd)
 633                 goto bail;
 634
 635         fop_fd->fops = fops;
 636         fop_fd->flags = *flags;
 637         fop_fd->fd = ret;
 638         fop_fd->filesystem_priv = NULL; /* we don't use it */
 639         fop_fd->len = stat_buf.st_size;
 640         fop_fd->pos = 0;
 641
 642         return fop_fd;
 643
 644 bail:
 645         close(ret);
 646         return NULL;
 647 }
 648
 649 LWS_VISIBLE int
 650 _lws_plat_file_close(lws_fop_fd_t *fop_fd)
 651 {
 652         int fd = (*fop_fd)->fd;
 653
 654         free(*fop_fd);
 655         *fop_fd = NULL;
 656
 657         return close(fd);
 658 }
 659
 660 LWS_VISIBLE lws_fileofs_t
 661 _lws_plat_file_seek_cur(lws_fop_fd_t fop_fd, lws_fileofs_t offset)
 662 {
 663         lws_fileofs_t r;
 664
 665         if (offset > 0 && offset > fop_fd->len - fop_fd->pos)
 666                 offset = fop_fd->len - fop_fd->pos;
 667
 668         if ((lws_fileofs_t)fop_fd->pos + offset < 0)
 669                 offset = -fop_fd->pos;
 670
 671         r = lseek(fop_fd->fd, offset, SEEK_CUR);
 672
 673         if (r >= 0)
 674                 fop_fd->pos = r;
 675         else
 676                 lwsl_err("error seeking from cur %ld, offset %ld\n",
 677                         (long)fop_fd->pos, (long)offset);
 678
 679         return r;
 680 }
 681
 682 LWS_VISIBLE int
 683 _lws_plat_file_read(lws_fop_fd_t fop_fd, lws_filepos_t *amount,
 684                     uint8_t *buf, lws_filepos_t len)
 685 {
 686         long n;
 687
 688         n = read((int)fop_fd->fd, buf, len);
 689         if (n == -1) {
 690                 *amount = 0;
 691                 return -1;
 692         }
 693         fop_fd->pos += n;
 694         lwsl_debug("%s: read %ld of req %ld, pos %ld, len %ld\n", __func__, n,
 695                   (long)len, (long)fop_fd->pos, (long)fop_fd->len);
 696         *amount = n;
 697
 698         return 0;
 699 }
 700
 701 LWS_VISIBLE int
 702 _lws_plat_file_write(lws_fop_fd_t fop_fd, lws_filepos_t *amount,
 703                      uint8_t *buf, lws_filepos_t len)
 704 {
 705         long n;
 706
 707         n = write((int)fop_fd->fd, buf, len);
 708         if (n == -1) {
 709                 *amount = 0;
 710                 return -1;
 711         }
 712
 713         fop_fd->pos += n;
 714         *amount = n;
 715
 716         return 0;
 717 }
 718
 719
 720 LWS_VISIBLE int
 721 lws_plat_init(struct lws_context *context,
 722               struct lws_context_creation_info *info)
 723 {
 724         struct lws_context_per_thread *pt = &context->pt[0];
 725         int n = context->count_threads, fd;
 726
 727         /* master context has the global fd lookup array */
 728         context->lws_lookup = lws_zalloc(sizeof(struct lws *) *
 729                                          context->max_fds);
 730         if (context->lws_lookup == NULL) {
 731                 lwsl_err("OOM on lws_lookup array for %d connections\n",
 732                          context->max_fds);
 733                 return 1;
 734         }
 735
 736         lwsl_notice(" mem: platform fd map: %5lu bytes\n",
 737                     (unsigned long)(sizeof(struct lws *) * context->max_fds));
 738         fd = open(SYSTEM_RANDOM_FILEPATH, O_RDONLY);
 739
 740         context->fd_random = fd;
 741         if (context->fd_random < 0) {
 742                 lwsl_err("Unable to open random device %s %d\n",
 743                          SYSTEM_RANDOM_FILEPATH, context->fd_random);
 744                 return 1;
 745         }
 746
 747         if (!lws_libev_init_fd_table(context) &&
 748             !lws_libuv_init_fd_table(context) &&
 749             !lws_libevent_init_fd_table(context)) {
 750                 /* otherwise libev handled it instead */
 751
 752                 while (n--) {
 753                         if (pipe(pt->dummy_pipe_fds)) {
 754                                 lwsl_err("Unable to create pipe\n");
 755                                 return 1;
 756                         }
 757
 758                         /* use the read end of pipe as first item */
 759                         pt->fds[0].fd = pt->dummy_pipe_fds[0];
 760                         pt->fds[0].events = LWS_POLLIN;
 761                         pt->fds[0].revents = 0;
 762                         pt->fds_count = 1;
 763                         pt++;
 764                 }
 765         }
 766
 767 #ifdef LWS_WITH_PLUGINS
 768         if (info->plugin_dirs)
 769                 lws_plat_plugins_init(context, info->plugin_dirs);
 770 #endif
 771
 772         return 0;
 773 }