src/intel/tools/aubinator.c

   1 /*
   2  * Copyright © 2016 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <stdint.h>
  27 #include <getopt.h>
  28
  29 #include <unistd.h>
  30 #include <fcntl.h>
  31 #include <string.h>
  32 #include <signal.h>
  33 #include <errno.h>
  34 #include <inttypes.h>
  35 #include <sys/types.h>
  36 #include <sys/stat.h>
  37 #include <sys/wait.h>
  38 #include <sys/mman.h>
  39
  40 #include "util/macros.h"
  41
  42 #include "common/gen_decoder.h"
  43 #include "intel_aub.h"
  44 #include "gen_disasm.h"
  45
  46 /* Below is the only command missing from intel_aub.h in libdrm
  47  * So, reuse intel_aub.h from libdrm and #define the
  48  * AUB_MI_BATCH_BUFFER_END as below
  49  */
  50 #define AUB_MI_BATCH_BUFFER_END (0x0500 << 16)
  51
  52 #define CSI "\e["
  53 #define BLUE_HEADER  CSI "0;44m"
  54 #define GREEN_HEADER CSI "1;42m"
  55 #define NORMAL       CSI "0m"
  56
  57 /* options */
  58
  59 static bool option_full_decode = true;
  60 static bool option_print_offsets = true;
  61 static enum { COLOR_AUTO, COLOR_ALWAYS, COLOR_NEVER } option_color;
  62
  63 /* state */
  64
  65 uint16_t pci_id = 0;
  66 char *input_file = NULL, *xml_path = NULL;
  67 struct gen_device_info devinfo;
  68 struct gen_batch_decode_ctx batch_ctx;
  69
  70 uint64_t gtt_size, gtt_end;
  71 void *gtt;
  72 uint64_t general_state_base;
  73 uint64_t surface_state_base;
  74 uint64_t dynamic_state_base;
  75 uint64_t instruction_base;
  76 uint64_t instruction_bound;
  77
  78 FILE *outfile;
  79
  80 static inline uint32_t
  81 field(uint32_t value, int start, int end)
  82 {
  83    uint32_t mask;
  84
  85    mask = ~0U >> (31 - end + start);
  86
  87    return (value >> start) & mask;
  88 }
  89
  90 struct brw_instruction;
  91
  92 static inline int
  93 valid_offset(uint32_t offset)
  94 {
  95    return offset < gtt_end;
  96 }
  97
  98 #define GEN_ENGINE_RENDER 1
  99 #define GEN_ENGINE_BLITTER 2
 100
 101 static void
 102 handle_trace_block(uint32_t *p)
 103 {
 104    int operation = p[1] & AUB_TRACE_OPERATION_MASK;
 105    int type = p[1] & AUB_TRACE_TYPE_MASK;
 106    int address_space = p[1] & AUB_TRACE_ADDRESS_SPACE_MASK;
 107    uint64_t offset = p[3];
 108    uint32_t size = p[4];
 109    int header_length = p[0] & 0xffff;
 110    uint32_t *data = p + header_length + 2;
 111    int engine = GEN_ENGINE_RENDER;
 112
 113    if (devinfo.gen >= 8)
 114       offset += (uint64_t) p[5] << 32;
 115
 116    switch (operation) {
 117    case AUB_TRACE_OP_DATA_WRITE:
 118       if (address_space != AUB_TRACE_MEMTYPE_GTT)
 119          break;
 120       if (gtt_size < offset + size) {
 121          fprintf(stderr, "overflow gtt space: %s\n", strerror(errno));
 122          exit(EXIT_FAILURE);
 123       }
 124       memcpy((char *) gtt + offset, data, size);
 125       if (gtt_end < offset + size)
 126          gtt_end = offset + size;
 127       break;
 128    case AUB_TRACE_OP_COMMAND_WRITE:
 129       switch (type) {
 130       case AUB_TRACE_TYPE_RING_PRB0:
 131          engine = GEN_ENGINE_RENDER;
 132          break;
 133       case AUB_TRACE_TYPE_RING_PRB2:
 134          engine = GEN_ENGINE_BLITTER;
 135          break;
 136       default:
 137          fprintf(outfile, "command write to unknown ring %d\n", type);
 138          break;
 139       }
 140
 141       (void)engine; /* TODO */
 142       gen_print_batch(&batch_ctx, data, size, 0);
 143
 144       gtt_end = 0;
 145       break;
 146    }
 147 }
 148
 149 static struct gen_batch_decode_bo
 150 get_gen_batch_bo(void *user_data, uint64_t address)
 151 {
 152    if (address > gtt_end)
 153       return (struct gen_batch_decode_bo) { .map = NULL };
 154
 155    /* We really only have one giant address range */
 156    return (struct gen_batch_decode_bo) {
 157       .addr = 0,
 158       .map = gtt,
 159       .size = gtt_size
 160    };
 161 }
 162
 163 static void
 164 aubinator_init(uint16_t aub_pci_id, const char *app_name)
 165 {
 166    if (!gen_get_device_info(pci_id, &devinfo)) {
 167       fprintf(stderr, "can't find device information: pci_id=0x%x\n", pci_id);
 168       exit(EXIT_FAILURE);
 169    }
 170
 171    enum gen_batch_decode_flags batch_flags = 0;
 172    if (option_color == COLOR_ALWAYS)
 173       batch_flags |= GEN_BATCH_DECODE_IN_COLOR;
 174    if (option_full_decode)
 175       batch_flags |= GEN_BATCH_DECODE_FULL;
 176    if (option_print_offsets)
 177       batch_flags |= GEN_BATCH_DECODE_OFFSETS;
 178    batch_flags |= GEN_BATCH_DECODE_FLOATS;
 179
 180    gen_batch_decode_ctx_init(&batch_ctx, &devinfo, outfile, batch_flags,
 181                              xml_path, get_gen_batch_bo, NULL);
 182
 183    char *color = GREEN_HEADER, *reset_color = NORMAL;
 184    if (option_color == COLOR_NEVER)
 185       color = reset_color = "";
 186
 187    fprintf(outfile, "%sAubinator: Intel AUB file decoder.%-80s%s\n",
 188            color, "", reset_color);
 189
 190    if (input_file)
 191       fprintf(outfile, "File name:        %s\n", input_file);
 192
 193    if (aub_pci_id)
 194       fprintf(outfile, "PCI ID:           0x%x\n", aub_pci_id);
 195
 196    fprintf(outfile, "Application name: %s\n", app_name);
 197
 198    fprintf(outfile, "Decoding as:      %s\n", gen_get_device_name(pci_id));
 199
 200    /* Throw in a new line before the first batch */
 201    fprintf(outfile, "\n");
 202 }
 203
 204 static void
 205 handle_trace_header(uint32_t *p)
 206 {
 207    /* The intel_aubdump tool from IGT is kind enough to put a PCI-ID= tag in
 208     * the AUB header comment.  If the user hasn't specified a hardware
 209     * generation, try to use the one from the AUB file.
 210     */
 211    uint32_t *end = p + (p[0] & 0xffff) + 2;
 212    int aub_pci_id = 0;
 213    if (end > &p[12] && p[12] > 0)
 214       sscanf((char *)&p[13], "PCI-ID=%i", &aub_pci_id);
 215
 216    if (pci_id == 0)
 217       pci_id = aub_pci_id;
 218
 219    char app_name[33];
 220    strncpy(app_name, (char *)&p[2], 32);
 221    app_name[32] = 0;
 222
 223    aubinator_init(aub_pci_id, app_name);
 224 }
 225
 226 struct aub_file {
 227    FILE *stream;
 228
 229    uint32_t *map, *end, *cursor;
 230    uint32_t *mem_end;
 231 };
 232
 233 static struct aub_file *
 234 aub_file_open(const char *filename)
 235 {
 236    struct aub_file *file;
 237    struct stat sb;
 238    int fd;
 239
 240    file = calloc(1, sizeof *file);
 241    fd = open(filename, O_RDONLY);
 242    if (fd == -1) {
 243       fprintf(stderr, "open %s failed: %s\n", filename, strerror(errno));
 244       exit(EXIT_FAILURE);
 245    }
 246
 247    if (fstat(fd, &sb) == -1) {
 248       fprintf(stderr, "stat failed: %s\n", strerror(errno));
 249       exit(EXIT_FAILURE);
 250    }
 251
 252    file->map = mmap(NULL, sb.st_size,
 253                     PROT_READ, MAP_SHARED, fd, 0);
 254    if (file->map == MAP_FAILED) {
 255       fprintf(stderr, "mmap failed: %s\n", strerror(errno));
 256       exit(EXIT_FAILURE);
 257    }
 258
 259    close(fd);
 260
 261    file->cursor = file->map;
 262    file->end = file->map + sb.st_size / 4;
 263
 264    return file;
 265 }
 266
 267 static struct aub_file *
 268 aub_file_stdin(void)
 269 {
 270    struct aub_file *file;
 271
 272    file = calloc(1, sizeof *file);
 273    file->stream = stdin;
 274
 275    return file;
 276 }
 277
 278 #define TYPE(dw)       (((dw) >> 29) & 7)
 279 #define OPCODE(dw)     (((dw) >> 23) & 0x3f)
 280 #define SUBOPCODE(dw)  (((dw) >> 16) & 0x7f)
 281
 282 #define MAKE_HEADER(type, opcode, subopcode) \
 283                    (((type) << 29) | ((opcode) << 23) | ((subopcode) << 16))
 284
 285 #define TYPE_AUB            0x7
 286
 287 /* Classic AUB opcodes */
 288 #define OPCODE_AUB          0x01
 289 #define SUBOPCODE_HEADER    0x05
 290 #define SUBOPCODE_BLOCK     0x41
 291 #define SUBOPCODE_BMP       0x1e
 292
 293 /* Newer version AUB opcode */
 294 #define OPCODE_NEW_AUB      0x2e
 295 #define SUBOPCODE_VERSION   0x00
 296 #define SUBOPCODE_REG_WRITE 0x03
 297 #define SUBOPCODE_MEM_POLL  0x05
 298 #define SUBOPCODE_MEM_WRITE 0x06
 299
 300 #define MAKE_GEN(major, minor) ( ((major) << 8) | (minor) )
 301
 302 struct {
 303    const char *name;
 304    uint32_t gen;
 305 } device_map[] = {
 306    { "bwr", MAKE_GEN(4, 0) },
 307    { "cln", MAKE_GEN(4, 0) },
 308    { "blc", MAKE_GEN(4, 0) },
 309    { "ctg", MAKE_GEN(4, 0) },
 310    { "el", MAKE_GEN(4, 0) },
 311    { "il", MAKE_GEN(4, 0) },
 312    { "sbr", MAKE_GEN(6, 0) },
 313    { "ivb", MAKE_GEN(7, 0) },
 314    { "lrb2", MAKE_GEN(0, 0) },
 315    { "hsw", MAKE_GEN(7, 5) },
 316    { "vlv", MAKE_GEN(7, 0) },
 317    { "bdw", MAKE_GEN(8, 0) },
 318    { "skl", MAKE_GEN(9, 0) },
 319    { "chv", MAKE_GEN(8, 0) },
 320    { "bxt", MAKE_GEN(9, 0) },
 321    { "cnl", MAKE_GEN(10, 0) },
 322 };
 323
 324 enum {
 325    AUB_ITEM_DECODE_OK,
 326    AUB_ITEM_DECODE_FAILED,
 327    AUB_ITEM_DECODE_NEED_MORE_DATA,
 328 };
 329
 330 static int
 331 aub_file_decode_batch(struct aub_file *file)
 332 {
 333    uint32_t *p, h, device, data_type, *new_cursor;
 334    int header_length, bias;
 335
 336    if (file->end - file->cursor < 1)
 337       return AUB_ITEM_DECODE_NEED_MORE_DATA;
 338
 339    p = file->cursor;
 340    h = *p;
 341    header_length = h & 0xffff;
 342
 343    switch (OPCODE(h)) {
 344    case OPCODE_AUB:
 345       bias = 2;
 346       break;
 347    case OPCODE_NEW_AUB:
 348       bias = 1;
 349       break;
 350    default:
 351       fprintf(outfile, "unknown opcode %d at %td/%td\n",
 352               OPCODE(h), file->cursor - file->map,
 353               file->end - file->map);
 354       return AUB_ITEM_DECODE_FAILED;
 355    }
 356
 357    new_cursor = p + header_length + bias;
 358    if ((h & 0xffff0000) == MAKE_HEADER(TYPE_AUB, OPCODE_AUB, SUBOPCODE_BLOCK)) {
 359       if (file->end - file->cursor < 4)
 360          return AUB_ITEM_DECODE_NEED_MORE_DATA;
 361       new_cursor += p[4] / 4;
 362    }
 363
 364    if (new_cursor > file->end)
 365       return AUB_ITEM_DECODE_NEED_MORE_DATA;
 366
 367    switch (h & 0xffff0000) {
 368    case MAKE_HEADER(TYPE_AUB, OPCODE_AUB, SUBOPCODE_HEADER):
 369       handle_trace_header(p);
 370       break;
 371    case MAKE_HEADER(TYPE_AUB, OPCODE_AUB, SUBOPCODE_BLOCK):
 372       handle_trace_block(p);
 373       break;
 374    case MAKE_HEADER(TYPE_AUB, OPCODE_AUB, SUBOPCODE_BMP):
 375       break;
 376    case MAKE_HEADER(TYPE_AUB, OPCODE_NEW_AUB, SUBOPCODE_VERSION):
 377       fprintf(outfile, "version block: dw1 %08x\n", p[1]);
 378       device = (p[1] >> 8) & 0xff;
 379       fprintf(outfile, "  device %s\n", device_map[device].name);
 380       break;
 381    case MAKE_HEADER(TYPE_AUB, OPCODE_NEW_AUB, SUBOPCODE_REG_WRITE):
 382       fprintf(outfile, "register write block: (dwords %d)\n", h & 0xffff);
 383       fprintf(outfile, "  reg 0x%x, data 0x%x\n", p[1], p[5]);
 384       break;
 385    case MAKE_HEADER(TYPE_AUB, OPCODE_NEW_AUB, SUBOPCODE_MEM_WRITE):
 386       fprintf(outfile, "memory write block (dwords %d):\n", h & 0xffff);
 387       fprintf(outfile, "  address 0x%"PRIx64"\n", *(uint64_t *) &p[1]);
 388       data_type = (p[3] >> 20) & 0xff;
 389       if (data_type != 0)
 390          fprintf(outfile, "  data type 0x%x\n", data_type);
 391       fprintf(outfile, "  address space 0x%x\n", (p[3] >> 28) & 0xf);
 392       break;
 393    case MAKE_HEADER(TYPE_AUB, OPCODE_NEW_AUB, SUBOPCODE_MEM_POLL):
 394       fprintf(outfile, "memory poll block (dwords %d):\n", h & 0xffff);
 395       break;
 396    default:
 397       fprintf(outfile, "unknown block type=0x%x, opcode=0x%x, "
 398              "subopcode=0x%x (%08x)\n", TYPE(h), OPCODE(h), SUBOPCODE(h), h);
 399       break;
 400    }
 401    file->cursor = new_cursor;
 402
 403    return AUB_ITEM_DECODE_OK;
 404 }
 405
 406 static int
 407 aub_file_more_stuff(struct aub_file *file)
 408 {
 409    return file->cursor < file->end || (file->stream && !feof(file->stream));
 410 }
 411
 412 #define AUB_READ_BUFFER_SIZE (4096)
 413 #define MAX(a, b) ((a) < (b) ? (b) : (a))
 414
 415 static void
 416 aub_file_data_grow(struct aub_file *file)
 417 {
 418    size_t old_size = (file->mem_end - file->map) * 4;
 419    size_t new_size = MAX(old_size * 2, AUB_READ_BUFFER_SIZE);
 420    uint32_t *new_start = realloc(file->map, new_size);
 421
 422    file->cursor = new_start + (file->cursor - file->map);
 423    file->end = new_start + (file->end - file->map);
 424    file->map = new_start;
 425    file->mem_end = file->map + (new_size / 4);
 426 }
 427
 428 static bool
 429 aub_file_data_load(struct aub_file *file)
 430 {
 431    size_t r;
 432
 433    if (file->stream == NULL)
 434       return false;
 435
 436    /* First remove any consumed data */
 437    if (file->cursor > file->map) {
 438       memmove(file->map, file->cursor,
 439               (file->end - file->cursor) * 4);
 440       file->end -= file->cursor - file->map;
 441       file->cursor = file->map;
 442    }
 443
 444    /* Then load some new data in */
 445    if ((file->mem_end - file->end) < (AUB_READ_BUFFER_SIZE / 4))
 446       aub_file_data_grow(file);
 447
 448    r = fread(file->end, 1, (file->mem_end - file->end) * 4, file->stream);
 449    file->end += r / 4;
 450
 451    return r != 0;
 452 }
 453
 454 static void
 455 setup_pager(void)
 456 {
 457    int fds[2];
 458    pid_t pid;
 459
 460    if (!isatty(1))
 461       return;
 462
 463    if (pipe(fds) == -1)
 464       return;
 465
 466    pid = fork();
 467    if (pid == -1)
 468       return;
 469
 470    if (pid == 0) {
 471       close(fds[1]);
 472       dup2(fds[0], 0);
 473       execlp("less", "less", "-FRSi", NULL);
 474    }
 475
 476    close(fds[0]);
 477    dup2(fds[1], 1);
 478    close(fds[1]);
 479 }
 480
 481 static void
 482 print_help(const char *progname, FILE *file)
 483 {
 484    fprintf(file,
 485            "Usage: %s [OPTION]... [FILE]\n"
 486            "Decode aub file contents from either FILE or the standard input.\n\n"
 487            "A valid --gen option must be provided.\n\n"
 488            "      --help          display this help and exit\n"
 489            "      --gen=platform  decode for given platform (ivb, byt, hsw, bdw, chv, skl, kbl, bxt or cnl)\n"
 490            "      --headers       decode only command headers\n"
 491            "      --color[=WHEN]  colorize the output; WHEN can be 'auto' (default\n"
 492            "                        if omitted), 'always', or 'never'\n"
 493            "      --no-pager      don't launch pager\n"
 494            "      --no-offsets    don't print instruction offsets\n"
 495            "      --xml=DIR       load hardware xml description from directory DIR\n",
 496            progname);
 497 }
 498
 499 int main(int argc, char *argv[])
 500 {
 501    struct aub_file *file;
 502    int c, i;
 503    bool help = false, pager = true;
 504    const struct {
 505       const char *name;
 506       int pci_id;
 507    } gens[] = {
 508       { "ilk", 0x0046 }, /* Intel(R) Ironlake Mobile */
 509       { "snb", 0x0126 }, /* Intel(R) Sandybridge Mobile GT2 */
 510       { "ivb", 0x0166 }, /* Intel(R) Ivybridge Mobile GT2 */
 511       { "hsw", 0x0416 }, /* Intel(R) Haswell Mobile GT2 */
 512       { "byt", 0x0155 }, /* Intel(R) Bay Trail */
 513       { "bdw", 0x1616 }, /* Intel(R) HD Graphics 5500 (Broadwell GT2) */
 514       { "chv", 0x22B3 }, /* Intel(R) HD Graphics (Cherryview) */
 515       { "skl", 0x1912 }, /* Intel(R) HD Graphics 530 (Skylake GT2) */
 516       { "kbl", 0x591D }, /* Intel(R) Kabylake GT2 */
 517       { "bxt", 0x0A84 },  /* Intel(R) HD Graphics (Broxton) */
 518       { "cnl", 0x5A52 },  /* Intel(R) HD Graphics (Cannonlake) */
 519    };
 520    const struct option aubinator_opts[] = {
 521       { "help",       no_argument,       (int *) &help,                 true },
 522       { "no-pager",   no_argument,       (int *) &pager,                false },
 523       { "no-offsets", no_argument,       (int *) &option_print_offsets, false },
 524       { "gen",        required_argument, NULL,                          'g' },
 525       { "headers",    no_argument,       (int *) &option_full_decode,   false },
 526       { "color",      required_argument, NULL,                          'c' },
 527       { "xml",        required_argument, NULL,                          'x' },
 528       { NULL,         0,                 NULL,                          0 }
 529    };
 530
 531    outfile = stdout;
 532
 533    i = 0;
 534    while ((c = getopt_long(argc, argv, "", aubinator_opts, &i)) != -1) {
 535       switch (c) {
 536       case 'g':
 537          for (i = 0; i < ARRAY_SIZE(gens); i++) {
 538             if (!strcmp(optarg, gens[i].name)) {
 539                pci_id = gens[i].pci_id;
 540                break;
 541             }
 542          }
 543          if (i == ARRAY_SIZE(gens)) {
 544             fprintf(stderr, "can't parse gen: '%s', expected ivb, byt, hsw, "
 545                                    "bdw, chv, skl, kbl or bxt\n", optarg);
 546             exit(EXIT_FAILURE);
 547          }
 548          break;
 549       case 'c':
 550          if (optarg == NULL || strcmp(optarg, "always") == 0)
 551             option_color = COLOR_ALWAYS;
 552          else if (strcmp(optarg, "never") == 0)
 553             option_color = COLOR_NEVER;
 554          else if (strcmp(optarg, "auto") == 0)
 555             option_color = COLOR_AUTO;
 556          else {
 557             fprintf(stderr, "invalid value for --color: %s", optarg);
 558             exit(EXIT_FAILURE);
 559          }
 560          break;
 561       case 'x':
 562          xml_path = strdup(optarg);
 563          break;
 564       default:
 565          break;
 566       }
 567    }
 568
 569    if (help || argc == 1) {
 570       print_help(argv[0], stderr);
 571       exit(0);
 572    }
 573
 574    if (optind < argc)
 575       input_file = argv[optind];
 576
 577    /* Do this before we redirect stdout to pager. */
 578    if (option_color == COLOR_AUTO)
 579       option_color = isatty(1) ? COLOR_ALWAYS : COLOR_NEVER;
 580
 581    if (isatty(1) && pager)
 582       setup_pager();
 583
 584    if (input_file == NULL)
 585       file = aub_file_stdin();
 586    else
 587       file = aub_file_open(input_file);
 588
 589    /* mmap a terabyte for our gtt space. */
 590    gtt_size = 1ull << 40;
 591    gtt = mmap(NULL, gtt_size, PROT_READ | PROT_WRITE,
 592               MAP_PRIVATE | MAP_ANONYMOUS |  MAP_NORESERVE, -1, 0);
 593    if (gtt == MAP_FAILED) {
 594       fprintf(stderr, "failed to alloc gtt space: %s\n", strerror(errno));
 595       exit(EXIT_FAILURE);
 596    }
 597
 598    while (aub_file_more_stuff(file)) {
 599       switch (aub_file_decode_batch(file)) {
 600       case AUB_ITEM_DECODE_OK:
 601          break;
 602       case AUB_ITEM_DECODE_NEED_MORE_DATA:
 603          if (!file->stream) {
 604             file->cursor = file->end;
 605             break;
 606          }
 607          if (aub_file_more_stuff(file) && !aub_file_data_load(file)) {
 608             fprintf(stderr, "failed to load data from stdin\n");
 609             exit(EXIT_FAILURE);
 610          }
 611          break;
 612       default:
 613          fprintf(stderr, "failed to parse aubdump data\n");
 614          exit(EXIT_FAILURE);
 615       }
 616    }
 617
 618
 619    fflush(stdout);
 620    /* close the stdout which is opened to write the output */
 621    close(1);
 622    free(xml_path);
 623
 624    wait(NULL);
 625
 626    return EXIT_SUCCESS;
 627 }