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         lws_stats_atomic_bump(context, pt, LWSSTATS_C_SERVICE_ENTRY, 1);
 118
 119         if (timeout_ms < 0)
 120                 goto faked_service;
 121
 122         lws_libev_run(context, tsi);
 123         lws_libuv_run(context, tsi);
 124         lws_libevent_run(context, tsi);
 125
 126         if (!context->service_tid_detected) {
 127                 struct lws _lws;
 128
 129                 memset(&_lws, 0, sizeof(_lws));
 130                 _lws.context = context;
 131
 132                 context->service_tid_detected =
 133                         context->vhost_list->protocols[0].callback(
 134                         &_lws, LWS_CALLBACK_GET_THREAD_ID, NULL, NULL, 0);
 135         }
 136         context->service_tid = context->service_tid_detected;
 137
 138         /*
 139          * is there anybody with pending stuff that needs service forcing?
 140          */
 141         if (!lws_service_adjust_timeout(context, 1, tsi)) {
 142                 /* -1 timeout means just do forced service */
 143                 _lws_plat_service_tsi(context, -1, pt->tid);
 144                 /* still somebody left who wants forced service? */
 145                 if (!lws_service_adjust_timeout(context, 1, pt->tid))
 146                         /* yes... come back again quickly */
 147                         timeout_ms = 0;
 148         }
 149
 150         n = poll(pt->fds, pt->fds_count, timeout_ms);
 151
 152 #ifdef LWS_OPENSSL_SUPPORT
 153         if (!pt->rx_draining_ext_list &&
 154             !lws_ssl_anybody_has_buffered_read_tsi(context, tsi) && !n) {
 155 #else
 156         if (!pt->rx_draining_ext_list && !n) /* poll timeout */ {
 157 #endif
 158                 lws_service_fd_tsi(context, NULL, tsi);
 159                 return 0;
 160         }
 161
 162 faked_service:
 163         m = lws_service_flag_pending(context, tsi);
 164         if (m)
 165                 c = -1; /* unknown limit */
 166         else
 167                 if (n < 0) {
 168                         if (LWS_ERRNO != LWS_EINTR)
 169                                 return -1;
 170                         return 0;
 171                 } else
 172                         c = n;
 173
 174         /* any socket with events to service? */
 175         for (n = 0; n < pt->fds_count && c; n++) {
 176                 if (!pt->fds[n].revents)
 177                         continue;
 178
 179                 c--;
 180
 181                 if (pt->fds[n].fd == pt->dummy_pipe_fds[0]) {
 182                         if (read(pt->fds[n].fd, &buf, 1) != 1)
 183                                 lwsl_err("Cannot read from dummy pipe.");
 184                         continue;
 185                 }
 186
 187                 m = lws_service_fd_tsi(context, &pt->fds[n], tsi);
 188                 if (m < 0)
 189                         return -1;
 190                 /* if something closed, retry this slot */
 191                 if (m)
 192                         n--;
 193         }
 194
 195         return 0;
 196 }
 197
 198 LWS_VISIBLE int
 199 lws_plat_check_connection_error(struct lws *wsi)
 200 {
 201         return 0;
 202 }
 203
 204 LWS_VISIBLE int
 205 lws_plat_service(struct lws_context *context, int timeout_ms)
 206 {
 207         return _lws_plat_service_tsi(context, timeout_ms, 0);
 208 }
 209
 210 LWS_VISIBLE int
 211 lws_plat_set_socket_options(struct lws_vhost *vhost, int fd)
 212 {
 213         int optval = 1;
 214         socklen_t optlen = sizeof(optval);
 215
 216 #if defined(__APPLE__) || \
 217     defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || \
 218     defined(__NetBSD__) || \
 219     defined(__OpenBSD__)
 220         struct protoent *tcp_proto;
 221 #endif
 222
 223         if (vhost->ka_time) {
 224                 /* enable keepalive on this socket */
 225                 optval = 1;
 226                 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE,
 227                                (const void *)&optval, optlen) < 0)
 228                         return 1;
 229
 230 #if defined(__APPLE__) || \
 231     defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || \
 232     defined(__NetBSD__) || \
 233         defined(__CYGWIN__) || defined(__OpenBSD__) || defined (__sun)
 234
 235                 /*
 236                  * didn't find a way to set these per-socket, need to
 237                  * tune kernel systemwide values
 238                  */
 239 #else
 240                 /* set the keepalive conditions we want on it too */
 241                 optval = vhost->ka_time;
 242                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE,
 243                                (const void *)&optval, optlen) < 0)
 244                         return 1;
 245
 246                 optval = vhost->ka_interval;
 247                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL,
 248                                (const void *)&optval, optlen) < 0)
 249                         return 1;
 250
 251                 optval = vhost->ka_probes;
 252                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT,
 253                                (const void *)&optval, optlen) < 0)
 254                         return 1;
 255 #endif
 256         }
 257
 258 #if defined(SO_BINDTODEVICE)
 259         if (vhost->bind_iface) {
 260                 lwsl_info("binding listen skt to %s using SO_BINDTODEVICE\n", vhost->iface);
 261                 if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, vhost->iface,
 262                                 strlen(vhost->iface)) < 0) {
 263                         lwsl_warn("Failed to bind to device %s\n", vhost->iface);
 264                         return 1;
 265                 }
 266         }
 267 #endif
 268
 269         /* Disable Nagle */
 270         optval = 1;
 271 #if defined (__sun)
 272         if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (const void *)&optval, optlen) < 0)
 273                 return 1;
 274 #elif !defined(__APPLE__) && \
 275       !defined(__FreeBSD__) && !defined(__FreeBSD_kernel__) &&        \
 276       !defined(__NetBSD__) && \
 277       !defined(__OpenBSD__)
 278         if (setsockopt(fd, SOL_TCP, TCP_NODELAY, (const void *)&optval, optlen) < 0)
 279                 return 1;
 280 #else
 281         tcp_proto = getprotobyname("TCP");
 282         if (setsockopt(fd, tcp_proto->p_proto, TCP_NODELAY, &optval, optlen) < 0)
 283                 return 1;
 284 #endif
 285
 286         /* We are nonblocking... */
 287         if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
 288                 return 1;
 289
 290         return 0;
 291 }
 292
 293 #if defined(LWS_HAVE_SYS_CAPABILITY_H) && defined(LWS_HAVE_LIBCAP)
 294 static void
 295 _lws_plat_apply_caps(int mode, cap_value_t *cv, int count)
 296 {
 297         cap_t caps = cap_get_proc();
 298
 299         if (!count)
 300                 return;
 301
 302         cap_set_flag(caps, mode, count, cv, CAP_SET);
 303         cap_set_proc(caps);
 304         prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0);
 305         cap_free(caps);
 306 }
 307 #endif
 308
 309 LWS_VISIBLE void
 310 lws_plat_drop_app_privileges(struct lws_context_creation_info *info)
 311 {
 312 #if defined(LWS_HAVE_SYS_CAPABILITY_H) && defined(LWS_HAVE_LIBCAP)
 313         int n;
 314 #endif
 315
 316         if (info->gid != -1)
 317                 if (setgid(info->gid))
 318                         lwsl_warn("setgid: %s\n", strerror(LWS_ERRNO));
 319
 320         if (info->uid != -1) {
 321                 struct passwd *p = getpwuid(info->uid);
 322
 323                 if (p) {
 324
 325 #if defined(LWS_HAVE_SYS_CAPABILITY_H) && defined(LWS_HAVE_LIBCAP)
 326                         _lws_plat_apply_caps(CAP_PERMITTED, info->caps, info->count_caps);
 327 #endif
 328
 329                         initgroups(p->pw_name, info->gid);
 330                         if (setuid(info->uid))
 331                                 lwsl_warn("setuid: %s\n", strerror(LWS_ERRNO));
 332                         else
 333                                 lwsl_notice("Set privs to user '%s'\n", p->pw_name);
 334
 335 #if defined(LWS_HAVE_SYS_CAPABILITY_H) && defined(LWS_HAVE_LIBCAP)
 336                         _lws_plat_apply_caps(CAP_EFFECTIVE, info->caps, info->count_caps);
 337
 338                         if (info->count_caps)
 339                                 for (n = 0; n < info->count_caps; n++)
 340                                         lwsl_notice("   RETAINING CAPABILITY %d\n", (int)info->caps[n]);
 341 #endif
 342
 343                 } else
 344                         lwsl_warn("getpwuid: unable to find uid %d", info->uid);
 345         }
 346 }
 347
 348 #ifdef LWS_WITH_PLUGINS
 349
 350 #if defined(LWS_USE_LIBUV) && UV_VERSION_MAJOR > 0
 351
 352 /* libuv.c implements these in a cross-platform way */
 353
 354 #else
 355
 356 static int filter(const struct dirent *ent)
 357 {
 358         if (!strcmp(ent->d_name, ".") || !strcmp(ent->d_name, ".."))
 359                 return 0;
 360
 361         return 1;
 362 }
 363
 364 LWS_VISIBLE int
 365 lws_plat_plugins_init(struct lws_context * context, const char * const *d)
 366 {
 367         struct lws_plugin_capability lcaps;
 368         struct lws_plugin *plugin;
 369         lws_plugin_init_func initfunc;
 370         struct dirent **namelist;
 371         int n, i, m, ret = 0;
 372         char path[256];
 373         void *l;
 374
 375         lwsl_notice("  Plugins:\n");
 376
 377         while (d && *d) {
 378                 n = scandir(*d, &namelist, filter, alphasort);
 379                 if (n < 0) {
 380                         lwsl_err("Scandir on %s failed\n", *d);
 381                         return 1;
 382                 }
 383
 384                 for (i = 0; i < n; i++) {
 385                         if (strlen(namelist[i]->d_name) < 7)
 386                                 goto inval;
 387
 388                         lwsl_notice("   %s\n", namelist[i]->d_name);
 389
 390                         lws_snprintf(path, sizeof(path) - 1, "%s/%s", *d,
 391                                  namelist[i]->d_name);
 392                         l = dlopen(path, RTLD_NOW);
 393                         if (!l) {
 394                                 lwsl_err("Error loading DSO: %s\n", dlerror());
 395                                 while (i++ < n)
 396                                         free(namelist[i]);
 397                                 goto bail;
 398                         }
 399                         /* we could open it, can we get his init function? */
 400                         m = lws_snprintf(path, sizeof(path) - 1, "init_%s",
 401                                      namelist[i]->d_name + 3 /* snip lib... */);
 402                         path[m - 3] = '\0'; /* snip the .so */
 403                         initfunc = dlsym(l, path);
 404                         if (!initfunc) {
 405                                 lwsl_err("Failed to get init on %s: %s",
 406                                                 namelist[i]->d_name, dlerror());
 407                                 dlclose(l);
 408                         }
 409                         lcaps.api_magic = LWS_PLUGIN_API_MAGIC;
 410                         m = initfunc(context, &lcaps);
 411                         if (m) {
 412                                 lwsl_err("Initializing %s failed %d\n",
 413                                         namelist[i]->d_name, m);
 414                                 dlclose(l);
 415                                 goto skip;
 416                         }
 417
 418                         plugin = lws_malloc(sizeof(*plugin));
 419                         if (!plugin) {
 420                                 lwsl_err("OOM\n");
 421                                 goto bail;
 422                         }
 423                         plugin->list = context->plugin_list;
 424                         context->plugin_list = plugin;
 425                         strncpy(plugin->name, namelist[i]->d_name, sizeof(plugin->name) - 1);
 426                         plugin->name[sizeof(plugin->name) - 1] = '\0';
 427                         plugin->l = l;
 428                         plugin->caps = lcaps;
 429                         context->plugin_protocol_count += lcaps.count_protocols;
 430                         context->plugin_extension_count += lcaps.count_extensions;
 431
 432                         free(namelist[i]);
 433                         continue;
 434
 435         skip:
 436                         dlclose(l);
 437         inval:
 438                         free(namelist[i]);
 439                 }
 440                 free(namelist);
 441                 d++;
 442         }
 443
 444 bail:
 445         free(namelist);
 446
 447         return ret;
 448 }
 449
 450 LWS_VISIBLE int
 451 lws_plat_plugins_destroy(struct lws_context * context)
 452 {
 453         struct lws_plugin *plugin = context->plugin_list, *p;
 454         lws_plugin_destroy_func func;
 455         char path[256];
 456         int m;
 457
 458         if (!plugin)
 459                 return 0;
 460
 461         lwsl_notice("%s\n", __func__);
 462
 463         while (plugin) {
 464                 p = plugin;
 465                 m = lws_snprintf(path, sizeof(path) - 1, "destroy_%s", plugin->name + 3);
 466                 path[m - 3] = '\0';
 467                 func = dlsym(plugin->l, path);
 468                 if (!func) {
 469                         lwsl_err("Failed to get destroy on %s: %s",
 470                                         plugin->name, dlerror());
 471                         goto next;
 472                 }
 473                 m = func(context);
 474                 if (m)
 475                         lwsl_err("Initializing %s failed %d\n",
 476                                 plugin->name, m);
 477 next:
 478                 dlclose(p->l);
 479                 plugin = p->list;
 480                 p->list = NULL;
 481                 free(p);
 482         }
 483
 484         context->plugin_list = NULL;
 485
 486         return 0;
 487 }
 488
 489 #endif
 490 #endif
 491
 492
 493 #if 0
 494 static void
 495 sigabrt_handler(int x)
 496 {
 497         printf("%s\n", __func__);
 498         //*(char *)0 = 0;
 499 }
 500 #endif
 501
 502 LWS_VISIBLE int
 503 lws_plat_context_early_init(void)
 504 {
 505 #if !defined(LWS_AVOID_SIGPIPE_IGN)
 506         signal(SIGPIPE, SIG_IGN);
 507 #endif
 508
 509 //      signal(SIGABRT, sigabrt_handler);
 510
 511         return 0;
 512 }
 513
 514 LWS_VISIBLE void
 515 lws_plat_context_early_destroy(struct lws_context *context)
 516 {
 517 }
 518
 519 LWS_VISIBLE void
 520 lws_plat_context_late_destroy(struct lws_context *context)
 521 {
 522         struct lws_context_per_thread *pt = &context->pt[0];
 523         int m = context->count_threads;
 524
 525 #ifdef LWS_WITH_PLUGINS
 526         if (context->plugin_list)
 527                 lws_plat_plugins_destroy(context);
 528 #endif
 529
 530         if (context->lws_lookup)
 531                 lws_free(context->lws_lookup);
 532
 533         while (m--) {
 534                 if (pt->dummy_pipe_fds[0])
 535                         close(pt->dummy_pipe_fds[0]);
 536                 if (pt->dummy_pipe_fds[1])
 537                         close(pt->dummy_pipe_fds[1]);
 538                 pt++;
 539         }
 540         if (!context->fd_random)
 541                 lwsl_err("ZERO RANDOM FD\n");
 542         if (context->fd_random != LWS_INVALID_FILE)
 543                 close(context->fd_random);
 544 }
 545
 546 /* cast a struct sockaddr_in6 * into addr for ipv6 */
 547
 548 LWS_VISIBLE int
 549 lws_interface_to_sa(int ipv6, const char *ifname, struct sockaddr_in *addr,
 550                     size_t addrlen)
 551 {
 552         int rc = -1;
 553
 554         struct ifaddrs *ifr;
 555         struct ifaddrs *ifc;
 556 #ifdef LWS_USE_IPV6
 557         struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
 558 #endif
 559
 560         getifaddrs(&ifr);
 561         for (ifc = ifr; ifc != NULL && rc; ifc = ifc->ifa_next) {
 562                 if (!ifc->ifa_addr)
 563                         continue;
 564
 565                 lwsl_info(" interface %s vs %s\n", ifc->ifa_name, ifname);
 566
 567                 if (strcmp(ifc->ifa_name, ifname))
 568                         continue;
 569
 570                 switch (ifc->ifa_addr->sa_family) {
 571                 case AF_INET:
 572 #ifdef LWS_USE_IPV6
 573                         if (ipv6) {
 574                                 /* map IPv4 to IPv6 */
 575                                 bzero((char *)&addr6->sin6_addr,
 576                                                 sizeof(struct in6_addr));
 577                                 addr6->sin6_addr.s6_addr[10] = 0xff;
 578                                 addr6->sin6_addr.s6_addr[11] = 0xff;
 579                                 memcpy(&addr6->sin6_addr.s6_addr[12],
 580                                         &((struct sockaddr_in *)ifc->ifa_addr)->sin_addr,
 581                                                         sizeof(struct in_addr));
 582                         } else
 583 #endif
 584                                 memcpy(addr,
 585                                         (struct sockaddr_in *)ifc->ifa_addr,
 586                                                     sizeof(struct sockaddr_in));
 587                         break;
 588 #ifdef LWS_USE_IPV6
 589                 case AF_INET6:
 590                         memcpy(&addr6->sin6_addr,
 591                           &((struct sockaddr_in6 *)ifc->ifa_addr)->sin6_addr,
 592                                                        sizeof(struct in6_addr));
 593                         break;
 594 #endif
 595                 default:
 596                         continue;
 597                 }
 598                 rc = 0;
 599         }
 600
 601         freeifaddrs(ifr);
 602
 603         if (rc == -1) {
 604                 /* check if bind to IP address */
 605 #ifdef LWS_USE_IPV6
 606                 if (inet_pton(AF_INET6, ifname, &addr6->sin6_addr) == 1)
 607                         rc = 0;
 608                 else
 609 #endif
 610                 if (inet_pton(AF_INET, ifname, &addr->sin_addr) == 1)
 611                         rc = 0;
 612         }
 613
 614         return rc;
 615 }
 616
 617 LWS_VISIBLE void
 618 lws_plat_insert_socket_into_fds(struct lws_context *context, struct lws *wsi)
 619 {
 620         struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
 621
 622         lws_libev_io(wsi, LWS_EV_START | LWS_EV_READ);
 623         lws_libuv_io(wsi, LWS_EV_START | LWS_EV_READ);
 624         lws_libevent_io(wsi, LWS_EV_START | LWS_EV_READ);
 625
 626         pt->fds[pt->fds_count++].revents = 0;
 627 }
 628
 629 LWS_VISIBLE void
 630 lws_plat_delete_socket_from_fds(struct lws_context *context,
 631                                                 struct lws *wsi, int m)
 632 {
 633         struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
 634
 635         lws_libev_io(wsi, LWS_EV_STOP | LWS_EV_READ | LWS_EV_WRITE);
 636         lws_libuv_io(wsi, LWS_EV_STOP | LWS_EV_READ | LWS_EV_WRITE);
 637         lws_libevent_io(wsi, LWS_EV_STOP | LWS_EV_READ | LWS_EV_WRITE);
 638
 639         pt->fds_count--;
 640 }
 641
 642 LWS_VISIBLE void
 643 lws_plat_service_periodic(struct lws_context *context)
 644 {
 645         /* if our parent went down, don't linger around */
 646         if (context->started_with_parent &&
 647             kill(context->started_with_parent, 0) < 0)
 648                 kill(getpid(), SIGTERM);
 649 }
 650
 651 LWS_VISIBLE int
 652 lws_plat_change_pollfd(struct lws_context *context,
 653                       struct lws *wsi, struct lws_pollfd *pfd)
 654 {
 655         return 0;
 656 }
 657
 658 LWS_VISIBLE const char *
 659 lws_plat_inet_ntop(int af, const void *src, char *dst, int cnt)
 660 {
 661         return inet_ntop(af, src, dst, cnt);
 662 }
 663
 664 LWS_VISIBLE int
 665 lws_plat_inet_pton(int af, const char *src, void *dst)
 666 {
 667         return inet_pton(af, src, dst);
 668 }
 669
 670 LWS_VISIBLE lws_fop_fd_t
 671 _lws_plat_file_open(const struct lws_plat_file_ops *fops, const char *filename,
 672                     const char *vpath, lws_fop_flags_t *flags)
 673 {
 674         struct stat stat_buf;
 675         int ret = open(filename, (*flags) & LWS_FOP_FLAGS_MASK, 0664);
 676         lws_fop_fd_t fop_fd;
 677
 678         if (ret < 0)
 679                 return NULL;
 680
 681         if (fstat(ret, &stat_buf) < 0)
 682                 goto bail;
 683
 684         fop_fd = malloc(sizeof(*fop_fd));
 685         if (!fop_fd)
 686                 goto bail;
 687
 688         fop_fd->fops = fops;
 689         fop_fd->flags = *flags;
 690         fop_fd->fd = ret;
 691         fop_fd->filesystem_priv = NULL; /* we don't use it */
 692         fop_fd->len = stat_buf.st_size;
 693         fop_fd->pos = 0;
 694
 695         return fop_fd;
 696
 697 bail:
 698         close(ret);
 699         return NULL;
 700 }
 701
 702 LWS_VISIBLE int
 703 _lws_plat_file_close(lws_fop_fd_t *fop_fd)
 704 {
 705         int fd = (*fop_fd)->fd;
 706
 707         free(*fop_fd);
 708         *fop_fd = NULL;
 709
 710         return close(fd);
 711 }
 712
 713 LWS_VISIBLE lws_fileofs_t
 714 _lws_plat_file_seek_cur(lws_fop_fd_t fop_fd, lws_fileofs_t offset)
 715 {
 716         lws_fileofs_t r;
 717
 718         if (offset > 0 && offset > fop_fd->len - fop_fd->pos)
 719                 offset = fop_fd->len - fop_fd->pos;
 720
 721         if ((lws_fileofs_t)fop_fd->pos + offset < 0)
 722                 offset = -fop_fd->pos;
 723
 724         r = lseek(fop_fd->fd, offset, SEEK_CUR);
 725
 726         if (r >= 0)
 727                 fop_fd->pos = r;
 728         else
 729                 lwsl_err("error seeking from cur %ld, offset %ld\n",
 730                         (long)fop_fd->pos, (long)offset);
 731
 732         return r;
 733 }
 734
 735 LWS_VISIBLE int
 736 _lws_plat_file_read(lws_fop_fd_t fop_fd, lws_filepos_t *amount,
 737                     uint8_t *buf, lws_filepos_t len)
 738 {
 739         long n;
 740
 741         n = read((int)fop_fd->fd, buf, len);
 742         if (n == -1) {
 743                 *amount = 0;
 744                 return -1;
 745         }
 746         fop_fd->pos += n;
 747         lwsl_debug("%s: read %ld of req %ld, pos %ld, len %ld\n", __func__, n,
 748                   (long)len, (long)fop_fd->pos, (long)fop_fd->len);
 749         *amount = n;
 750
 751         return 0;
 752 }
 753
 754 LWS_VISIBLE int
 755 _lws_plat_file_write(lws_fop_fd_t fop_fd, lws_filepos_t *amount,
 756                      uint8_t *buf, lws_filepos_t len)
 757 {
 758         long n;
 759
 760         n = write((int)fop_fd->fd, buf, len);
 761         if (n == -1) {
 762                 *amount = 0;
 763                 return -1;
 764         }
 765
 766         fop_fd->pos += n;
 767         *amount = n;
 768
 769         return 0;
 770 }
 771
 772
 773 LWS_VISIBLE int
 774 lws_plat_init(struct lws_context *context,
 775               struct lws_context_creation_info *info)
 776 {
 777         struct lws_context_per_thread *pt = &context->pt[0];
 778         int n = context->count_threads, fd;
 779
 780         /* master context has the global fd lookup array */
 781         context->lws_lookup = lws_zalloc(sizeof(struct lws *) *
 782                                          context->max_fds);
 783         if (context->lws_lookup == NULL) {
 784                 lwsl_err("OOM on lws_lookup array for %d connections\n",
 785                          context->max_fds);
 786                 return 1;
 787         }
 788
 789         lwsl_notice(" mem: platform fd map: %5lu bytes\n",
 790                     (unsigned long)(sizeof(struct lws *) * context->max_fds));
 791         fd = open(SYSTEM_RANDOM_FILEPATH, O_RDONLY);
 792
 793         context->fd_random = fd;
 794         if (context->fd_random < 0) {
 795                 lwsl_err("Unable to open random device %s %d\n",
 796                          SYSTEM_RANDOM_FILEPATH, context->fd_random);
 797                 return 1;
 798         }
 799
 800         if (!lws_libev_init_fd_table(context) &&
 801             !lws_libuv_init_fd_table(context) &&
 802             !lws_libevent_init_fd_table(context)) {
 803                 /* otherwise libev handled it instead */
 804
 805                 while (n--) {
 806                         if (pipe(pt->dummy_pipe_fds)) {
 807                                 lwsl_err("Unable to create pipe\n");
 808                                 return 1;
 809                         }
 810
 811                         /* use the read end of pipe as first item */
 812                         pt->fds[0].fd = pt->dummy_pipe_fds[0];
 813                         pt->fds[0].events = LWS_POLLIN;
 814                         pt->fds[0].revents = 0;
 815                         pt->fds_count = 1;
 816                         pt++;
 817                 }
 818         }
 819
 820 #ifdef LWS_WITH_PLUGINS
 821         if (info->plugin_dirs)
 822                 lws_plat_plugins_init(context, info->plugin_dirs);
 823 #endif
 824
 825         return 0;
 826 }