tools/usb/ffs-test.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * ffs-test.c -- user mode filesystem api for usb composite function
   4  *
   5  * Copyright (C) 2010 Samsung Electronics
   6  *                    Author: Michal Nazarewicz <mina86@mina86.com>
   7  */
   8
   9 /* $(CROSS_COMPILE)cc -Wall -Wextra -g -o ffs-test ffs-test.c -lpthread */
  10
  11
  12 #define _DEFAULT_SOURCE /* for endian.h */
  13
  14 #include <endian.h>
  15 #include <errno.h>
  16 #include <fcntl.h>
  17 #include <pthread.h>
  18 #include <stdarg.h>
  19 #include <stdbool.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <sys/ioctl.h>
  24 #include <sys/stat.h>
  25 #include <sys/types.h>
  26 #include <unistd.h>
  27 #include <tools/le_byteshift.h>
  28
  29 #include "../../include/uapi/linux/usb/functionfs.h"
  30
  31
  32 /******************** Little Endian Handling ********************************/
  33
  34 /*
  35  * cpu_to_le16/32 are used when initializing structures, a context where a
  36  * function call is not allowed. To solve this, we code cpu_to_le16/32 in a way
  37  * that allows them to be used when initializing structures.
  38  */
  39
  40 #if __BYTE_ORDER == __LITTLE_ENDIAN
  41 #define cpu_to_le16(x)  (x)
  42 #define cpu_to_le32(x)  (x)
  43 #else
  44 #define cpu_to_le16(x)  ((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8))
  45 #define cpu_to_le32(x)  \
  46         ((((x) & 0xff000000u) >> 24) | (((x) & 0x00ff0000u) >>  8) | \
  47         (((x) & 0x0000ff00u) <<  8) | (((x) & 0x000000ffu) << 24))
  48 #endif
  49
  50 #define le32_to_cpu(x)  le32toh(x)
  51 #define le16_to_cpu(x)  le16toh(x)
  52
  53 /******************** Messages and Errors ***********************************/
  54
  55 static const char argv0[] = "ffs-test";
  56
  57 static unsigned verbosity = 7;
  58
  59 static void _msg(unsigned level, const char *fmt, ...)
  60 {
  61         if (level < 2)
  62                 level = 2;
  63         else if (level > 7)
  64                 level = 7;
  65
  66         if (level <= verbosity) {
  67                 static const char levels[8][6] = {
  68                         [2] = "crit:",
  69                         [3] = "err: ",
  70                         [4] = "warn:",
  71                         [5] = "note:",
  72                         [6] = "info:",
  73                         [7] = "dbg: "
  74                 };
  75
  76                 int _errno = errno;
  77                 va_list ap;
  78
  79                 fprintf(stderr, "%s: %s ", argv0, levels[level]);
  80                 va_start(ap, fmt);
  81                 vfprintf(stderr, fmt, ap);
  82                 va_end(ap);
  83
  84                 if (fmt[strlen(fmt) - 1] != '\n') {
  85                         char buffer[128];
  86                         strerror_r(_errno, buffer, sizeof buffer);
  87                         fprintf(stderr, ": (-%d) %s\n", _errno, buffer);
  88                 }
  89
  90                 fflush(stderr);
  91         }
  92 }
  93
  94 #define die(...)  (_msg(2, __VA_ARGS__), exit(1))
  95 #define err(...)   _msg(3, __VA_ARGS__)
  96 #define warn(...)  _msg(4, __VA_ARGS__)
  97 #define note(...)  _msg(5, __VA_ARGS__)
  98 #define info(...)  _msg(6, __VA_ARGS__)
  99 #define debug(...) _msg(7, __VA_ARGS__)
 100
 101 #define die_on(cond, ...) do { \
 102         if (cond) \
 103                 die(__VA_ARGS__); \
 104         } while (0)
 105
 106
 107 /******************** Descriptors and Strings *******************************/
 108
 109 static const struct {
 110         struct usb_functionfs_descs_head_v2 header;
 111         __le32 fs_count;
 112         __le32 hs_count;
 113         __le32 ss_count;
 114         struct {
 115                 struct usb_interface_descriptor intf;
 116                 struct usb_endpoint_descriptor_no_audio sink;
 117                 struct usb_endpoint_descriptor_no_audio source;
 118         } __attribute__((packed)) fs_descs, hs_descs;
 119         struct {
 120                 struct usb_interface_descriptor intf;
 121                 struct usb_endpoint_descriptor_no_audio sink;
 122                 struct usb_ss_ep_comp_descriptor sink_comp;
 123                 struct usb_endpoint_descriptor_no_audio source;
 124                 struct usb_ss_ep_comp_descriptor source_comp;
 125         } ss_descs;
 126 } __attribute__((packed)) descriptors = {
 127         .header = {
 128                 .magic = cpu_to_le32(FUNCTIONFS_DESCRIPTORS_MAGIC_V2),
 129                 .flags = cpu_to_le32(FUNCTIONFS_HAS_FS_DESC |
 130                                      FUNCTIONFS_HAS_HS_DESC |
 131                                      FUNCTIONFS_HAS_SS_DESC),
 132                 .length = cpu_to_le32(sizeof descriptors),
 133         },
 134         .fs_count = cpu_to_le32(3),
 135         .fs_descs = {
 136                 .intf = {
 137                         .bLength = sizeof descriptors.fs_descs.intf,
 138                         .bDescriptorType = USB_DT_INTERFACE,
 139                         .bNumEndpoints = 2,
 140                         .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
 141                         .iInterface = 1,
 142                 },
 143                 .sink = {
 144                         .bLength = sizeof descriptors.fs_descs.sink,
 145                         .bDescriptorType = USB_DT_ENDPOINT,
 146                         .bEndpointAddress = 1 | USB_DIR_IN,
 147                         .bmAttributes = USB_ENDPOINT_XFER_BULK,
 148                         /* .wMaxPacketSize = autoconfiguration (kernel) */
 149                 },
 150                 .source = {
 151                         .bLength = sizeof descriptors.fs_descs.source,
 152                         .bDescriptorType = USB_DT_ENDPOINT,
 153                         .bEndpointAddress = 2 | USB_DIR_OUT,
 154                         .bmAttributes = USB_ENDPOINT_XFER_BULK,
 155                         /* .wMaxPacketSize = autoconfiguration (kernel) */
 156                 },
 157         },
 158         .hs_count = cpu_to_le32(3),
 159         .hs_descs = {
 160                 .intf = {
 161                         .bLength = sizeof descriptors.fs_descs.intf,
 162                         .bDescriptorType = USB_DT_INTERFACE,
 163                         .bNumEndpoints = 2,
 164                         .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
 165                         .iInterface = 1,
 166                 },
 167                 .sink = {
 168                         .bLength = sizeof descriptors.hs_descs.sink,
 169                         .bDescriptorType = USB_DT_ENDPOINT,
 170                         .bEndpointAddress = 1 | USB_DIR_IN,
 171                         .bmAttributes = USB_ENDPOINT_XFER_BULK,
 172                         .wMaxPacketSize = cpu_to_le16(512),
 173                 },
 174                 .source = {
 175                         .bLength = sizeof descriptors.hs_descs.source,
 176                         .bDescriptorType = USB_DT_ENDPOINT,
 177                         .bEndpointAddress = 2 | USB_DIR_OUT,
 178                         .bmAttributes = USB_ENDPOINT_XFER_BULK,
 179                         .wMaxPacketSize = cpu_to_le16(512),
 180                         .bInterval = 1, /* NAK every 1 uframe */
 181                 },
 182         },
 183         .ss_count = cpu_to_le32(5),
 184         .ss_descs = {
 185                 .intf = {
 186                         .bLength = sizeof descriptors.fs_descs.intf,
 187                         .bDescriptorType = USB_DT_INTERFACE,
 188                         .bNumEndpoints = 2,
 189                         .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
 190                         .iInterface = 1,
 191                 },
 192                 .sink = {
 193                         .bLength = sizeof descriptors.hs_descs.sink,
 194                         .bDescriptorType = USB_DT_ENDPOINT,
 195                         .bEndpointAddress = 1 | USB_DIR_IN,
 196                         .bmAttributes = USB_ENDPOINT_XFER_BULK,
 197                         .wMaxPacketSize = cpu_to_le16(1024),
 198                 },
 199                 .sink_comp = {
 200                         .bLength = USB_DT_SS_EP_COMP_SIZE,
 201                         .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
 202                         .bMaxBurst = 0,
 203                         .bmAttributes = 0,
 204                         .wBytesPerInterval = 0,
 205                 },
 206                 .source = {
 207                         .bLength = sizeof descriptors.hs_descs.source,
 208                         .bDescriptorType = USB_DT_ENDPOINT,
 209                         .bEndpointAddress = 2 | USB_DIR_OUT,
 210                         .bmAttributes = USB_ENDPOINT_XFER_BULK,
 211                         .wMaxPacketSize = cpu_to_le16(1024),
 212                         .bInterval = 1, /* NAK every 1 uframe */
 213                 },
 214                 .source_comp = {
 215                         .bLength = USB_DT_SS_EP_COMP_SIZE,
 216                         .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
 217                         .bMaxBurst = 0,
 218                         .bmAttributes = 0,
 219                         .wBytesPerInterval = 0,
 220                 },
 221         },
 222 };
 223
 224 static size_t descs_to_legacy(void **legacy, const void *descriptors_v2)
 225 {
 226         const unsigned char *descs_end, *descs_start;
 227         __u32 length, fs_count = 0, hs_count = 0, count;
 228
 229         /* Read v2 header */
 230         {
 231                 const struct {
 232                         const struct usb_functionfs_descs_head_v2 header;
 233                         const __le32 counts[];
 234                 } __attribute__((packed)) *const in = descriptors_v2;
 235                 const __le32 *counts = in->counts;
 236                 __u32 flags;
 237
 238                 if (le32_to_cpu(in->header.magic) !=
 239                     FUNCTIONFS_DESCRIPTORS_MAGIC_V2)
 240                         return 0;
 241                 length = le32_to_cpu(in->header.length);
 242                 if (length <= sizeof in->header)
 243                         return 0;
 244                 length -= sizeof in->header;
 245                 flags = le32_to_cpu(in->header.flags);
 246                 if (flags & ~(FUNCTIONFS_HAS_FS_DESC | FUNCTIONFS_HAS_HS_DESC |
 247                               FUNCTIONFS_HAS_SS_DESC))
 248                         return 0;
 249
 250 #define GET_NEXT_COUNT_IF_FLAG(ret, flg) do {           \
 251                         if (!(flags & (flg)))           \
 252                                 break;                  \
 253                         if (length < 4)                 \
 254                                 return 0;               \
 255                         ret = le32_to_cpu(*counts);     \
 256                         length -= 4;                    \
 257                         ++counts;                       \
 258                 } while (0)
 259
 260                 GET_NEXT_COUNT_IF_FLAG(fs_count, FUNCTIONFS_HAS_FS_DESC);
 261                 GET_NEXT_COUNT_IF_FLAG(hs_count, FUNCTIONFS_HAS_HS_DESC);
 262                 GET_NEXT_COUNT_IF_FLAG(count, FUNCTIONFS_HAS_SS_DESC);
 263
 264                 count = fs_count + hs_count;
 265                 if (!count)
 266                         return 0;
 267                 descs_start = (const void *)counts;
 268
 269 #undef GET_NEXT_COUNT_IF_FLAG
 270         }
 271
 272         /*
 273          * Find the end of FS and HS USB descriptors.  SS descriptors
 274          * are ignored since legacy format does not support them.
 275          */
 276         descs_end = descs_start;
 277         do {
 278                 if (length < *descs_end)
 279                         return 0;
 280                 length -= *descs_end;
 281                 descs_end += *descs_end;
 282         } while (--count);
 283
 284         /* Allocate legacy descriptors and copy the data. */
 285         {
 286 #pragma GCC diagnostic push
 287 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
 288                 struct {
 289                         struct usb_functionfs_descs_head header;
 290                         __u8 descriptors[];
 291                 } __attribute__((packed)) *out;
 292 #pragma GCC diagnostic pop
 293
 294                 length = sizeof out->header + (descs_end - descs_start);
 295                 out = malloc(length);
 296                 out->header.magic = cpu_to_le32(FUNCTIONFS_DESCRIPTORS_MAGIC);
 297                 out->header.length = cpu_to_le32(length);
 298                 out->header.fs_count = cpu_to_le32(fs_count);
 299                 out->header.hs_count = cpu_to_le32(hs_count);
 300                 memcpy(out->descriptors, descs_start, descs_end - descs_start);
 301                 *legacy = out;
 302         }
 303
 304         return length;
 305 }
 306
 307
 308 #define STR_INTERFACE_ "Source/Sink"
 309
 310 static const struct {
 311         struct usb_functionfs_strings_head header;
 312         struct {
 313                 __le16 code;
 314                 const char str1[sizeof STR_INTERFACE_];
 315         } __attribute__((packed)) lang0;
 316 } __attribute__((packed)) strings = {
 317         .header = {
 318                 .magic = cpu_to_le32(FUNCTIONFS_STRINGS_MAGIC),
 319                 .length = cpu_to_le32(sizeof strings),
 320                 .str_count = cpu_to_le32(1),
 321                 .lang_count = cpu_to_le32(1),
 322         },
 323         .lang0 = {
 324                 cpu_to_le16(0x0409), /* en-us */
 325                 STR_INTERFACE_,
 326         },
 327 };
 328
 329 #define STR_INTERFACE strings.lang0.str1
 330
 331
 332 /******************** Files and Threads Handling ****************************/
 333
 334 struct thread;
 335
 336 static ssize_t read_wrap(struct thread *t, void *buf, size_t nbytes);
 337 static ssize_t write_wrap(struct thread *t, const void *buf, size_t nbytes);
 338 static ssize_t ep0_consume(struct thread *t, const void *buf, size_t nbytes);
 339 static ssize_t fill_in_buf(struct thread *t, void *buf, size_t nbytes);
 340 static ssize_t empty_out_buf(struct thread *t, const void *buf, size_t nbytes);
 341
 342
 343 static struct thread {
 344         const char *const filename;
 345         size_t buf_size;
 346
 347         ssize_t (*in)(struct thread *, void *, size_t);
 348         const char *const in_name;
 349
 350         ssize_t (*out)(struct thread *, const void *, size_t);
 351         const char *const out_name;
 352
 353         int fd;
 354         pthread_t id;
 355         void *buf;
 356         ssize_t status;
 357 } threads[] = {
 358         {
 359                 "ep0", 4 * sizeof(struct usb_functionfs_event),
 360                 read_wrap, NULL,
 361                 ep0_consume, "<consume>",
 362                 0, 0, NULL, 0
 363         },
 364         {
 365                 "ep1", 8 * 1024,
 366                 fill_in_buf, "<in>",
 367                 write_wrap, NULL,
 368                 0, 0, NULL, 0
 369         },
 370         {
 371                 "ep2", 8 * 1024,
 372                 read_wrap, NULL,
 373                 empty_out_buf, "<out>",
 374                 0, 0, NULL, 0
 375         },
 376 };
 377
 378
 379 static void init_thread(struct thread *t)
 380 {
 381         t->buf = malloc(t->buf_size);
 382         die_on(!t->buf, "malloc");
 383
 384         t->fd = open(t->filename, O_RDWR);
 385         die_on(t->fd < 0, "%s", t->filename);
 386 }
 387
 388 static void cleanup_thread(void *arg)
 389 {
 390         struct thread *t = arg;
 391         int ret, fd;
 392
 393         fd = t->fd;
 394         if (t->fd < 0)
 395                 return;
 396         t->fd = -1;
 397
 398         /* test the FIFO ioctls (non-ep0 code paths) */
 399         if (t != threads) {
 400                 ret = ioctl(fd, FUNCTIONFS_FIFO_STATUS);
 401                 if (ret < 0) {
 402                         /* ENODEV reported after disconnect */
 403                         if (errno != ENODEV)
 404                                 err("%s: get fifo status", t->filename);
 405                 } else if (ret) {
 406                         warn("%s: unclaimed = %d\n", t->filename, ret);
 407                         if (ioctl(fd, FUNCTIONFS_FIFO_FLUSH) < 0)
 408                                 err("%s: fifo flush", t->filename);
 409                 }
 410         }
 411
 412         if (close(fd) < 0)
 413                 err("%s: close", t->filename);
 414
 415         free(t->buf);
 416         t->buf = NULL;
 417 }
 418
 419 static void *start_thread_helper(void *arg)
 420 {
 421         const char *name, *op, *in_name, *out_name;
 422         struct thread *t = arg;
 423         ssize_t ret;
 424
 425         info("%s: starts\n", t->filename);
 426         in_name = t->in_name ? t->in_name : t->filename;
 427         out_name = t->out_name ? t->out_name : t->filename;
 428
 429         pthread_cleanup_push(cleanup_thread, arg);
 430
 431         for (;;) {
 432                 pthread_testcancel();
 433
 434                 ret = t->in(t, t->buf, t->buf_size);
 435                 if (ret > 0) {
 436                         ret = t->out(t, t->buf, ret);
 437                         name = out_name;
 438                         op = "write";
 439                 } else {
 440                         name = in_name;
 441                         op = "read";
 442                 }
 443
 444                 if (ret > 0) {
 445                         /* nop */
 446                 } else if (!ret) {
 447                         debug("%s: %s: EOF", name, op);
 448                         break;
 449                 } else if (errno == EINTR || errno == EAGAIN) {
 450                         debug("%s: %s", name, op);
 451                 } else {
 452                         warn("%s: %s", name, op);
 453                         break;
 454                 }
 455         }
 456
 457         pthread_cleanup_pop(1);
 458
 459         t->status = ret;
 460         info("%s: ends\n", t->filename);
 461         return NULL;
 462 }
 463
 464 static void start_thread(struct thread *t)
 465 {
 466         debug("%s: starting\n", t->filename);
 467
 468         die_on(pthread_create(&t->id, NULL, start_thread_helper, t) < 0,
 469                "pthread_create(%s)", t->filename);
 470 }
 471
 472 static void join_thread(struct thread *t)
 473 {
 474         int ret = pthread_join(t->id, NULL);
 475
 476         if (ret < 0)
 477                 err("%s: joining thread", t->filename);
 478         else
 479                 debug("%s: joined\n", t->filename);
 480 }
 481
 482
 483 static ssize_t read_wrap(struct thread *t, void *buf, size_t nbytes)
 484 {
 485         return read(t->fd, buf, nbytes);
 486 }
 487
 488 static ssize_t write_wrap(struct thread *t, const void *buf, size_t nbytes)
 489 {
 490         return write(t->fd, buf, nbytes);
 491 }
 492
 493
 494 /******************** Empty/Fill buffer routines ****************************/
 495
 496 /* 0 -- stream of zeros, 1 -- i % 63, 2 -- pipe */
 497 enum pattern { PAT_ZERO, PAT_SEQ, PAT_PIPE };
 498 static enum pattern pattern;
 499
 500 static ssize_t
 501 fill_in_buf(struct thread *ignore, void *buf, size_t nbytes)
 502 {
 503         size_t i;
 504         __u8 *p;
 505
 506         (void)ignore;
 507
 508         switch (pattern) {
 509         case PAT_ZERO:
 510                 memset(buf, 0, nbytes);
 511                 break;
 512
 513         case PAT_SEQ:
 514                 for (p = buf, i = 0; i < nbytes; ++i, ++p)
 515                         *p = i % 63;
 516                 break;
 517
 518         case PAT_PIPE:
 519                 return fread(buf, 1, nbytes, stdin);
 520         }
 521
 522         return nbytes;
 523 }
 524
 525 static ssize_t
 526 empty_out_buf(struct thread *ignore, const void *buf, size_t nbytes)
 527 {
 528         const __u8 *p;
 529         __u8 expected;
 530         ssize_t ret;
 531         size_t len;
 532
 533         (void)ignore;
 534
 535         switch (pattern) {
 536         case PAT_ZERO:
 537                 expected = 0;
 538                 for (p = buf, len = 0; len < nbytes; ++p, ++len)
 539                         if (*p)
 540                                 goto invalid;
 541                 break;
 542
 543         case PAT_SEQ:
 544                 for (p = buf, len = 0; len < nbytes; ++p, ++len)
 545                         if (*p != len % 63) {
 546                                 expected = len % 63;
 547                                 goto invalid;
 548                         }
 549                 break;
 550
 551         case PAT_PIPE:
 552                 ret = fwrite(buf, nbytes, 1, stdout);
 553                 if (ret > 0)
 554                         fflush(stdout);
 555                 break;
 556
 557 invalid:
 558                 err("bad OUT byte %zd, expected %02x got %02x\n",
 559                     len, expected, *p);
 560                 for (p = buf, len = 0; len < nbytes; ++p, ++len) {
 561                         if (0 == (len % 32))
 562                                 fprintf(stderr, "%4zd:", len);
 563                         fprintf(stderr, " %02x", *p);
 564                         if (31 == (len % 32))
 565                                 fprintf(stderr, "\n");
 566                 }
 567                 fflush(stderr);
 568                 errno = EILSEQ;
 569                 return -1;
 570         }
 571
 572         return len;
 573 }
 574
 575
 576 /******************** Endpoints routines ************************************/
 577
 578 static void handle_setup(const struct usb_ctrlrequest *setup)
 579 {
 580         printf("bRequestType = %d\n", setup->bRequestType);
 581         printf("bRequest     = %d\n", setup->bRequest);
 582         printf("wValue       = %d\n", le16_to_cpu(setup->wValue));
 583         printf("wIndex       = %d\n", le16_to_cpu(setup->wIndex));
 584         printf("wLength      = %d\n", le16_to_cpu(setup->wLength));
 585 }
 586
 587 static ssize_t
 588 ep0_consume(struct thread *ignore, const void *buf, size_t nbytes)
 589 {
 590         static const char *const names[] = {
 591                 [FUNCTIONFS_BIND] = "BIND",
 592                 [FUNCTIONFS_UNBIND] = "UNBIND",
 593                 [FUNCTIONFS_ENABLE] = "ENABLE",
 594                 [FUNCTIONFS_DISABLE] = "DISABLE",
 595                 [FUNCTIONFS_SETUP] = "SETUP",
 596                 [FUNCTIONFS_SUSPEND] = "SUSPEND",
 597                 [FUNCTIONFS_RESUME] = "RESUME",
 598         };
 599
 600         const struct usb_functionfs_event *event = buf;
 601         size_t n;
 602
 603         (void)ignore;
 604
 605         for (n = nbytes / sizeof *event; n; --n, ++event)
 606                 switch (event->type) {
 607                 case FUNCTIONFS_BIND:
 608                 case FUNCTIONFS_UNBIND:
 609                 case FUNCTIONFS_ENABLE:
 610                 case FUNCTIONFS_DISABLE:
 611                 case FUNCTIONFS_SETUP:
 612                 case FUNCTIONFS_SUSPEND:
 613                 case FUNCTIONFS_RESUME:
 614                         printf("Event %s\n", names[event->type]);
 615                         if (event->type == FUNCTIONFS_SETUP)
 616                                 handle_setup(&event->u.setup);
 617                         break;
 618
 619                 default:
 620                         printf("Event %03u (unknown)\n", event->type);
 621                 }
 622
 623         return nbytes;
 624 }
 625
 626 static void ep0_init(struct thread *t, bool legacy_descriptors)
 627 {
 628         void *legacy;
 629         ssize_t ret;
 630         size_t len;
 631
 632         if (legacy_descriptors) {
 633                 info("%s: writing descriptors\n", t->filename);
 634                 goto legacy;
 635         }
 636
 637         info("%s: writing descriptors (in v2 format)\n", t->filename);
 638         ret = write(t->fd, &descriptors, sizeof descriptors);
 639
 640         if (ret < 0 && errno == EINVAL) {
 641                 warn("%s: new format rejected, trying legacy\n", t->filename);
 642 legacy:
 643                 len = descs_to_legacy(&legacy, &descriptors);
 644                 if (len) {
 645                         ret = write(t->fd, legacy, len);
 646                         free(legacy);
 647                 }
 648         }
 649         die_on(ret < 0, "%s: write: descriptors", t->filename);
 650
 651         info("%s: writing strings\n", t->filename);
 652         ret = write(t->fd, &strings, sizeof strings);
 653         die_on(ret < 0, "%s: write: strings", t->filename);
 654 }
 655
 656
 657 /******************** Main **************************************************/
 658
 659 int main(int argc, char **argv)
 660 {
 661         bool legacy_descriptors;
 662         unsigned i;
 663
 664         legacy_descriptors = argc > 2 && !strcmp(argv[1], "-l");
 665
 666         init_thread(threads);
 667         ep0_init(threads, legacy_descriptors);
 668
 669         for (i = 1; i < sizeof threads / sizeof *threads; ++i)
 670                 init_thread(threads + i);
 671
 672         for (i = 1; i < sizeof threads / sizeof *threads; ++i)
 673                 start_thread(threads + i);
 674
 675         start_thread_helper(threads);
 676
 677         for (i = 1; i < sizeof threads / sizeof *threads; ++i)
 678                 join_thread(threads + i);
 679
 680         return 0;
 681 }