tools/perf/builtin-script.c

   1 #include "builtin.h"
   2
   3 #include "perf.h"
   4 #include "util/cache.h"
   5 #include "util/debug.h"
   6 #include "util/exec_cmd.h"
   7 #include "util/header.h"
   8 #include "util/parse-options.h"
   9 #include "util/session.h"
  10 #include "util/symbol.h"
  11 #include "util/thread.h"
  12 #include "util/trace-event.h"
  13 #include "util/parse-options.h"
  14 #include "util/util.h"
  15
  16 static char const               *script_name;
  17 static char const               *generate_script_lang;
  18 static bool                     debug_mode;
  19 static u64                      last_timestamp;
  20 static u64                      nr_unordered;
  21 extern const struct option      record_options[];
  22
  23 static int default_start_script(const char *script __unused,
  24                                 int argc __unused,
  25                                 const char **argv __unused)
  26 {
  27         return 0;
  28 }
  29
  30 static int default_stop_script(void)
  31 {
  32         return 0;
  33 }
  34
  35 static int default_generate_script(const char *outfile __unused)
  36 {
  37         return 0;
  38 }
  39
  40 static struct scripting_ops default_scripting_ops = {
  41         .start_script           = default_start_script,
  42         .stop_script            = default_stop_script,
  43         .process_event          = print_event,
  44         .generate_script        = default_generate_script,
  45 };
  46
  47 static struct scripting_ops     *scripting_ops;
  48
  49 static void setup_scripting(void)
  50 {
  51         setup_perl_scripting();
  52         setup_python_scripting();
  53
  54         scripting_ops = &default_scripting_ops;
  55 }
  56
  57 static int cleanup_scripting(void)
  58 {
  59         pr_debug("\nperf script stopped\n");
  60
  61         return scripting_ops->stop_script();
  62 }
  63
  64 static char const               *input_name = "perf.data";
  65
  66 static int process_sample_event(event_t *event, struct sample_data *sample,
  67                                 struct perf_session *session)
  68 {
  69         struct thread *thread = perf_session__findnew(session, event->ip.pid);
  70
  71         if (thread == NULL) {
  72                 pr_debug("problem processing %d event, skipping it.\n",
  73                          event->header.type);
  74                 return -1;
  75         }
  76
  77         if (session->sample_type & PERF_SAMPLE_RAW) {
  78                 if (debug_mode) {
  79                         if (sample->time < last_timestamp) {
  80                                 pr_err("Samples misordered, previous: %llu "
  81                                         "this: %llu\n", last_timestamp,
  82                                         sample->time);
  83                                 nr_unordered++;
  84                         }
  85                         last_timestamp = sample->time;
  86                         return 0;
  87                 }
  88                 /*
  89                  * FIXME: better resolve from pid from the struct trace_entry
  90                  * field, although it should be the same than this perf
  91                  * event pid
  92                  */
  93                 scripting_ops->process_event(sample->cpu, sample->raw_data,
  94                                              sample->raw_size,
  95                                              sample->time, thread->comm);
  96         }
  97
  98         session->hists.stats.total_period += sample->period;
  99         return 0;
 100 }
 101
 102 static u64 nr_lost;
 103
 104 static int process_lost_event(event_t *event, struct sample_data *sample __used,
 105                               struct perf_session *session __used)
 106 {
 107         nr_lost += event->lost.lost;
 108
 109         return 0;
 110 }
 111
 112 static struct perf_event_ops event_ops = {
 113         .sample = process_sample_event,
 114         .comm   = event__process_comm,
 115         .attr   = event__process_attr,
 116         .event_type = event__process_event_type,
 117         .tracing_data = event__process_tracing_data,
 118         .build_id = event__process_build_id,
 119         .lost = process_lost_event,
 120         .ordered_samples = true,
 121 };
 122
 123 extern volatile int session_done;
 124
 125 static void sig_handler(int sig __unused)
 126 {
 127         session_done = 1;
 128 }
 129
 130 static int __cmd_script(struct perf_session *session)
 131 {
 132         int ret;
 133
 134         signal(SIGINT, sig_handler);
 135
 136         ret = perf_session__process_events(session, &event_ops);
 137
 138         if (debug_mode) {
 139                 pr_err("Misordered timestamps: %llu\n", nr_unordered);
 140                 pr_err("Lost events: %llu\n", nr_lost);
 141         }
 142
 143         return ret;
 144 }
 145
 146 struct script_spec {
 147         struct list_head        node;
 148         struct scripting_ops    *ops;
 149         char                    spec[0];
 150 };
 151
 152 LIST_HEAD(script_specs);
 153
 154 static struct script_spec *script_spec__new(const char *spec,
 155                                             struct scripting_ops *ops)
 156 {
 157         struct script_spec *s = malloc(sizeof(*s) + strlen(spec) + 1);
 158
 159         if (s != NULL) {
 160                 strcpy(s->spec, spec);
 161                 s->ops = ops;
 162         }
 163
 164         return s;
 165 }
 166
 167 static void script_spec__delete(struct script_spec *s)
 168 {
 169         free(s->spec);
 170         free(s);
 171 }
 172
 173 static void script_spec__add(struct script_spec *s)
 174 {
 175         list_add_tail(&s->node, &script_specs);
 176 }
 177
 178 static struct script_spec *script_spec__find(const char *spec)
 179 {
 180         struct script_spec *s;
 181
 182         list_for_each_entry(s, &script_specs, node)
 183                 if (strcasecmp(s->spec, spec) == 0)
 184                         return s;
 185         return NULL;
 186 }
 187
 188 static struct script_spec *script_spec__findnew(const char *spec,
 189                                                 struct scripting_ops *ops)
 190 {
 191         struct script_spec *s = script_spec__find(spec);
 192
 193         if (s)
 194                 return s;
 195
 196         s = script_spec__new(spec, ops);
 197         if (!s)
 198                 goto out_delete_spec;
 199
 200         script_spec__add(s);
 201
 202         return s;
 203
 204 out_delete_spec:
 205         script_spec__delete(s);
 206
 207         return NULL;
 208 }
 209
 210 int script_spec_register(const char *spec, struct scripting_ops *ops)
 211 {
 212         struct script_spec *s;
 213
 214         s = script_spec__find(spec);
 215         if (s)
 216                 return -1;
 217
 218         s = script_spec__findnew(spec, ops);
 219         if (!s)
 220                 return -1;
 221
 222         return 0;
 223 }
 224
 225 static struct scripting_ops *script_spec__lookup(const char *spec)
 226 {
 227         struct script_spec *s = script_spec__find(spec);
 228         if (!s)
 229                 return NULL;
 230
 231         return s->ops;
 232 }
 233
 234 static void list_available_languages(void)
 235 {
 236         struct script_spec *s;
 237
 238         fprintf(stderr, "\n");
 239         fprintf(stderr, "Scripting language extensions (used in "
 240                 "perf script -s [spec:]script.[spec]):\n\n");
 241
 242         list_for_each_entry(s, &script_specs, node)
 243                 fprintf(stderr, "  %-42s [%s]\n", s->spec, s->ops->name);
 244
 245         fprintf(stderr, "\n");
 246 }
 247
 248 static int parse_scriptname(const struct option *opt __used,
 249                             const char *str, int unset __used)
 250 {
 251         char spec[PATH_MAX];
 252         const char *script, *ext;
 253         int len;
 254
 255         if (strcmp(str, "lang") == 0) {
 256                 list_available_languages();
 257                 exit(0);
 258         }
 259
 260         script = strchr(str, ':');
 261         if (script) {
 262                 len = script - str;
 263                 if (len >= PATH_MAX) {
 264                         fprintf(stderr, "invalid language specifier");
 265                         return -1;
 266                 }
 267                 strncpy(spec, str, len);
 268                 spec[len] = '\0';
 269                 scripting_ops = script_spec__lookup(spec);
 270                 if (!scripting_ops) {
 271                         fprintf(stderr, "invalid language specifier");
 272                         return -1;
 273                 }
 274                 script++;
 275         } else {
 276                 script = str;
 277                 ext = strrchr(script, '.');
 278                 if (!ext) {
 279                         fprintf(stderr, "invalid script extension");
 280                         return -1;
 281                 }
 282                 scripting_ops = script_spec__lookup(++ext);
 283                 if (!scripting_ops) {
 284                         fprintf(stderr, "invalid script extension");
 285                         return -1;
 286                 }
 287         }
 288
 289         script_name = strdup(script);
 290
 291         return 0;
 292 }
 293
 294 /* Helper function for filesystems that return a dent->d_type DT_UNKNOWN */
 295 static int is_directory(const char *base_path, const struct dirent *dent)
 296 {
 297         char path[PATH_MAX];
 298         struct stat st;
 299
 300         sprintf(path, "%s/%s", base_path, dent->d_name);
 301         if (stat(path, &st))
 302                 return 0;
 303
 304         return S_ISDIR(st.st_mode);
 305 }
 306
 307 #define for_each_lang(scripts_path, scripts_dir, lang_dirent, lang_next)\
 308         while (!readdir_r(scripts_dir, &lang_dirent, &lang_next) &&     \
 309                lang_next)                                               \
 310                 if ((lang_dirent.d_type == DT_DIR ||                    \
 311                      (lang_dirent.d_type == DT_UNKNOWN &&               \
 312                       is_directory(scripts_path, &lang_dirent))) &&     \
 313                     (strcmp(lang_dirent.d_name, ".")) &&                \
 314                     (strcmp(lang_dirent.d_name, "..")))
 315
 316 #define for_each_script(lang_path, lang_dir, script_dirent, script_next)\
 317         while (!readdir_r(lang_dir, &script_dirent, &script_next) &&    \
 318                script_next)                                             \
 319                 if (script_dirent.d_type != DT_DIR &&                   \
 320                     (script_dirent.d_type != DT_UNKNOWN ||              \
 321                      !is_directory(lang_path, &script_dirent)))
 322
 323
 324 #define RECORD_SUFFIX                   "-record"
 325 #define REPORT_SUFFIX                   "-report"
 326
 327 struct script_desc {
 328         struct list_head        node;
 329         char                    *name;
 330         char                    *half_liner;
 331         char                    *args;
 332 };
 333
 334 LIST_HEAD(script_descs);
 335
 336 static struct script_desc *script_desc__new(const char *name)
 337 {
 338         struct script_desc *s = zalloc(sizeof(*s));
 339
 340         if (s != NULL && name)
 341                 s->name = strdup(name);
 342
 343         return s;
 344 }
 345
 346 static void script_desc__delete(struct script_desc *s)
 347 {
 348         free(s->name);
 349         free(s->half_liner);
 350         free(s->args);
 351         free(s);
 352 }
 353
 354 static void script_desc__add(struct script_desc *s)
 355 {
 356         list_add_tail(&s->node, &script_descs);
 357 }
 358
 359 static struct script_desc *script_desc__find(const char *name)
 360 {
 361         struct script_desc *s;
 362
 363         list_for_each_entry(s, &script_descs, node)
 364                 if (strcasecmp(s->name, name) == 0)
 365                         return s;
 366         return NULL;
 367 }
 368
 369 static struct script_desc *script_desc__findnew(const char *name)
 370 {
 371         struct script_desc *s = script_desc__find(name);
 372
 373         if (s)
 374                 return s;
 375
 376         s = script_desc__new(name);
 377         if (!s)
 378                 goto out_delete_desc;
 379
 380         script_desc__add(s);
 381
 382         return s;
 383
 384 out_delete_desc:
 385         script_desc__delete(s);
 386
 387         return NULL;
 388 }
 389
 390 static const char *ends_with(const char *str, const char *suffix)
 391 {
 392         size_t suffix_len = strlen(suffix);
 393         const char *p = str;
 394
 395         if (strlen(str) > suffix_len) {
 396                 p = str + strlen(str) - suffix_len;
 397                 if (!strncmp(p, suffix, suffix_len))
 398                         return p;
 399         }
 400
 401         return NULL;
 402 }
 403
 404 static char *ltrim(char *str)
 405 {
 406         int len = strlen(str);
 407
 408         while (len && isspace(*str)) {
 409                 len--;
 410                 str++;
 411         }
 412
 413         return str;
 414 }
 415
 416 static int read_script_info(struct script_desc *desc, const char *filename)
 417 {
 418         char line[BUFSIZ], *p;
 419         FILE *fp;
 420
 421         fp = fopen(filename, "r");
 422         if (!fp)
 423                 return -1;
 424
 425         while (fgets(line, sizeof(line), fp)) {
 426                 p = ltrim(line);
 427                 if (strlen(p) == 0)
 428                         continue;
 429                 if (*p != '#')
 430                         continue;
 431                 p++;
 432                 if (strlen(p) && *p == '!')
 433                         continue;
 434
 435                 p = ltrim(p);
 436                 if (strlen(p) && p[strlen(p) - 1] == '\n')
 437                         p[strlen(p) - 1] = '\0';
 438
 439                 if (!strncmp(p, "description:", strlen("description:"))) {
 440                         p += strlen("description:");
 441                         desc->half_liner = strdup(ltrim(p));
 442                         continue;
 443                 }
 444
 445                 if (!strncmp(p, "args:", strlen("args:"))) {
 446                         p += strlen("args:");
 447                         desc->args = strdup(ltrim(p));
 448                         continue;
 449                 }
 450         }
 451
 452         fclose(fp);
 453
 454         return 0;
 455 }
 456
 457 static int list_available_scripts(const struct option *opt __used,
 458                                   const char *s __used, int unset __used)
 459 {
 460         struct dirent *script_next, *lang_next, script_dirent, lang_dirent;
 461         char scripts_path[MAXPATHLEN];
 462         DIR *scripts_dir, *lang_dir;
 463         char script_path[MAXPATHLEN];
 464         char lang_path[MAXPATHLEN];
 465         struct script_desc *desc;
 466         char first_half[BUFSIZ];
 467         char *script_root;
 468         char *str;
 469
 470         snprintf(scripts_path, MAXPATHLEN, "%s/scripts", perf_exec_path());
 471
 472         scripts_dir = opendir(scripts_path);
 473         if (!scripts_dir)
 474                 return -1;
 475
 476         for_each_lang(scripts_path, scripts_dir, lang_dirent, lang_next) {
 477                 snprintf(lang_path, MAXPATHLEN, "%s/%s/bin", scripts_path,
 478                          lang_dirent.d_name);
 479                 lang_dir = opendir(lang_path);
 480                 if (!lang_dir)
 481                         continue;
 482
 483                 for_each_script(lang_path, lang_dir, script_dirent, script_next) {
 484                         script_root = strdup(script_dirent.d_name);
 485                         str = (char *)ends_with(script_root, REPORT_SUFFIX);
 486                         if (str) {
 487                                 *str = '\0';
 488                                 desc = script_desc__findnew(script_root);
 489                                 snprintf(script_path, MAXPATHLEN, "%s/%s",
 490                                          lang_path, script_dirent.d_name);
 491                                 read_script_info(desc, script_path);
 492                         }
 493                         free(script_root);
 494                 }
 495         }
 496
 497         fprintf(stdout, "List of available trace scripts:\n");
 498         list_for_each_entry(desc, &script_descs, node) {
 499                 sprintf(first_half, "%s %s", desc->name,
 500                         desc->args ? desc->args : "");
 501                 fprintf(stdout, "  %-36s %s\n", first_half,
 502                         desc->half_liner ? desc->half_liner : "");
 503         }
 504
 505         exit(0);
 506 }
 507
 508 static char *get_script_path(const char *script_root, const char *suffix)
 509 {
 510         struct dirent *script_next, *lang_next, script_dirent, lang_dirent;
 511         char scripts_path[MAXPATHLEN];
 512         char script_path[MAXPATHLEN];
 513         DIR *scripts_dir, *lang_dir;
 514         char lang_path[MAXPATHLEN];
 515         char *str, *__script_root;
 516         char *path = NULL;
 517
 518         snprintf(scripts_path, MAXPATHLEN, "%s/scripts", perf_exec_path());
 519
 520         scripts_dir = opendir(scripts_path);
 521         if (!scripts_dir)
 522                 return NULL;
 523
 524         for_each_lang(scripts_path, scripts_dir, lang_dirent, lang_next) {
 525                 snprintf(lang_path, MAXPATHLEN, "%s/%s/bin", scripts_path,
 526                          lang_dirent.d_name);
 527                 lang_dir = opendir(lang_path);
 528                 if (!lang_dir)
 529                         continue;
 530
 531                 for_each_script(lang_path, lang_dir, script_dirent, script_next) {
 532                         __script_root = strdup(script_dirent.d_name);
 533                         str = (char *)ends_with(__script_root, suffix);
 534                         if (str) {
 535                                 *str = '\0';
 536                                 if (strcmp(__script_root, script_root))
 537                                         continue;
 538                                 snprintf(script_path, MAXPATHLEN, "%s/%s",
 539                                          lang_path, script_dirent.d_name);
 540                                 path = strdup(script_path);
 541                                 free(__script_root);
 542                                 break;
 543                         }
 544                         free(__script_root);
 545                 }
 546         }
 547
 548         return path;
 549 }
 550
 551 static bool is_top_script(const char *script_path)
 552 {
 553         return ends_with(script_path, "top") == NULL ? false : true;
 554 }
 555
 556 static int has_required_arg(char *script_path)
 557 {
 558         struct script_desc *desc;
 559         int n_args = 0;
 560         char *p;
 561
 562         desc = script_desc__new(NULL);
 563
 564         if (read_script_info(desc, script_path))
 565                 goto out;
 566
 567         if (!desc->args)
 568                 goto out;
 569
 570         for (p = desc->args; *p; p++)
 571                 if (*p == '<')
 572                         n_args++;
 573 out:
 574         script_desc__delete(desc);
 575
 576         return n_args;
 577 }
 578
 579 static const char * const script_usage[] = {
 580         "perf script [<options>]",
 581         "perf script [<options>] record <script> [<record-options>] <command>",
 582         "perf script [<options>] report <script> [script-args]",
 583         "perf script [<options>] <script> [<record-options>] <command>",
 584         "perf script [<options>] <top-script> [script-args]",
 585         NULL
 586 };
 587
 588 static const struct option options[] = {
 589         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
 590                     "dump raw trace in ASCII"),
 591         OPT_INCR('v', "verbose", &verbose,
 592                     "be more verbose (show symbol address, etc)"),
 593         OPT_BOOLEAN('L', "Latency", &latency_format,
 594                     "show latency attributes (irqs/preemption disabled, etc)"),
 595         OPT_CALLBACK_NOOPT('l', "list", NULL, NULL, "list available scripts",
 596                            list_available_scripts),
 597         OPT_CALLBACK('s', "script", NULL, "name",
 598                      "script file name (lang:script name, script name, or *)",
 599                      parse_scriptname),
 600         OPT_STRING('g', "gen-script", &generate_script_lang, "lang",
 601                    "generate perf-script.xx script in specified language"),
 602         OPT_STRING('i', "input", &input_name, "file",
 603                     "input file name"),
 604         OPT_BOOLEAN('d', "debug-mode", &debug_mode,
 605                    "do various checks like samples ordering and lost events"),
 606
 607         OPT_END()
 608 };
 609
 610 static bool have_cmd(int argc, const char **argv)
 611 {
 612         char **__argv = malloc(sizeof(const char *) * argc);
 613
 614         if (!__argv)
 615                 die("malloc");
 616         memcpy(__argv, argv, sizeof(const char *) * argc);
 617         argc = parse_options(argc, (const char **)__argv, record_options,
 618                              NULL, PARSE_OPT_STOP_AT_NON_OPTION);
 619         free(__argv);
 620
 621         return argc != 0;
 622 }
 623
 624 int cmd_script(int argc, const char **argv, const char *prefix __used)
 625 {
 626         char *rec_script_path = NULL;
 627         char *rep_script_path = NULL;
 628         struct perf_session *session;
 629         char *script_path = NULL;
 630         const char **__argv;
 631         bool system_wide;
 632         int i, j, err;
 633
 634         setup_scripting();
 635
 636         argc = parse_options(argc, argv, options, script_usage,
 637                              PARSE_OPT_STOP_AT_NON_OPTION);
 638
 639         if (argc > 1 && !strncmp(argv[0], "rec", strlen("rec"))) {
 640                 rec_script_path = get_script_path(argv[1], RECORD_SUFFIX);
 641                 if (!rec_script_path)
 642                         return cmd_record(argc, argv, NULL);
 643         }
 644
 645         if (argc > 1 && !strncmp(argv[0], "rep", strlen("rep"))) {
 646                 rep_script_path = get_script_path(argv[1], REPORT_SUFFIX);
 647                 if (!rep_script_path) {
 648                         fprintf(stderr,
 649                                 "Please specify a valid report script"
 650                                 "(see 'perf script -l' for listing)\n");
 651                         return -1;
 652                 }
 653         }
 654
 655         /* make sure PERF_EXEC_PATH is set for scripts */
 656         perf_set_argv_exec_path(perf_exec_path());
 657
 658         if (argc && !script_name && !rec_script_path && !rep_script_path) {
 659                 int live_pipe[2];
 660                 int rep_args;
 661                 pid_t pid;
 662
 663                 rec_script_path = get_script_path(argv[0], RECORD_SUFFIX);
 664                 rep_script_path = get_script_path(argv[0], REPORT_SUFFIX);
 665
 666                 if (!rec_script_path && !rep_script_path) {
 667                         fprintf(stderr, " Couldn't find script %s\n\n See perf"
 668                                 " script -l for available scripts.\n", argv[0]);
 669                         usage_with_options(script_usage, options);
 670                 }
 671
 672                 if (is_top_script(argv[0])) {
 673                         rep_args = argc - 1;
 674                 } else {
 675                         int rec_args;
 676
 677                         rep_args = has_required_arg(rep_script_path);
 678                         rec_args = (argc - 1) - rep_args;
 679                         if (rec_args < 0) {
 680                                 fprintf(stderr, " %s script requires options."
 681                                         "\n\n See perf script -l for available "
 682                                         "scripts and options.\n", argv[0]);
 683                                 usage_with_options(script_usage, options);
 684                         }
 685                 }
 686
 687                 if (pipe(live_pipe) < 0) {
 688                         perror("failed to create pipe");
 689                         exit(-1);
 690                 }
 691
 692                 pid = fork();
 693                 if (pid < 0) {
 694                         perror("failed to fork");
 695                         exit(-1);
 696                 }
 697
 698                 if (!pid) {
 699                         system_wide = true;
 700                         j = 0;
 701
 702                         dup2(live_pipe[1], 1);
 703                         close(live_pipe[0]);
 704
 705                         if (!is_top_script(argv[0]))
 706                                 system_wide = !have_cmd(argc - rep_args,
 707                                                         &argv[rep_args]);
 708
 709                         __argv = malloc((argc + 6) * sizeof(const char *));
 710                         if (!__argv)
 711                                 die("malloc");
 712
 713                         __argv[j++] = "/bin/sh";
 714                         __argv[j++] = rec_script_path;
 715                         if (system_wide)
 716                                 __argv[j++] = "-a";
 717                         __argv[j++] = "-q";
 718                         __argv[j++] = "-o";
 719                         __argv[j++] = "-";
 720                         for (i = rep_args + 1; i < argc; i++)
 721                                 __argv[j++] = argv[i];
 722                         __argv[j++] = NULL;
 723
 724                         execvp("/bin/sh", (char **)__argv);
 725                         free(__argv);
 726                         exit(-1);
 727                 }
 728
 729                 dup2(live_pipe[0], 0);
 730                 close(live_pipe[1]);
 731
 732                 __argv = malloc((argc + 4) * sizeof(const char *));
 733                 if (!__argv)
 734                         die("malloc");
 735                 j = 0;
 736                 __argv[j++] = "/bin/sh";
 737                 __argv[j++] = rep_script_path;
 738                 for (i = 1; i < rep_args + 1; i++)
 739                         __argv[j++] = argv[i];
 740                 __argv[j++] = "-i";
 741                 __argv[j++] = "-";
 742                 __argv[j++] = NULL;
 743
 744                 execvp("/bin/sh", (char **)__argv);
 745                 free(__argv);
 746                 exit(-1);
 747         }
 748
 749         if (rec_script_path)
 750                 script_path = rec_script_path;
 751         if (rep_script_path)
 752                 script_path = rep_script_path;
 753
 754         if (script_path) {
 755                 system_wide = false;
 756                 j = 0;
 757
 758                 if (rec_script_path)
 759                         system_wide = !have_cmd(argc - 1, &argv[1]);
 760
 761                 __argv = malloc((argc + 2) * sizeof(const char *));
 762                 if (!__argv)
 763                         die("malloc");
 764                 __argv[j++] = "/bin/sh";
 765                 __argv[j++] = script_path;
 766                 if (system_wide)
 767                         __argv[j++] = "-a";
 768                 for (i = 2; i < argc; i++)
 769                         __argv[j++] = argv[i];
 770                 __argv[j++] = NULL;
 771
 772                 execvp("/bin/sh", (char **)__argv);
 773                 free(__argv);
 774                 exit(-1);
 775         }
 776
 777         if (symbol__init() < 0)
 778                 return -1;
 779         if (!script_name)
 780                 setup_pager();
 781
 782         session = perf_session__new(input_name, O_RDONLY, 0, false);
 783         if (session == NULL)
 784                 return -ENOMEM;
 785
 786         if (strcmp(input_name, "-") &&
 787             !perf_session__has_traces(session, "record -R"))
 788                 return -EINVAL;
 789
 790         if (generate_script_lang) {
 791                 struct stat perf_stat;
 792
 793                 int input = open(input_name, O_RDONLY);
 794                 if (input < 0) {
 795                         perror("failed to open file");
 796                         exit(-1);
 797                 }
 798
 799                 err = fstat(input, &perf_stat);
 800                 if (err < 0) {
 801                         perror("failed to stat file");
 802                         exit(-1);
 803                 }
 804
 805                 if (!perf_stat.st_size) {
 806                         fprintf(stderr, "zero-sized file, nothing to do!\n");
 807                         exit(0);
 808                 }
 809
 810                 scripting_ops = script_spec__lookup(generate_script_lang);
 811                 if (!scripting_ops) {
 812                         fprintf(stderr, "invalid language specifier");
 813                         return -1;
 814                 }
 815
 816                 err = scripting_ops->generate_script("perf-script");
 817                 goto out;
 818         }
 819
 820         if (script_name) {
 821                 err = scripting_ops->start_script(script_name, argc, argv);
 822                 if (err)
 823                         goto out;
 824                 pr_debug("perf script started with script %s\n\n", script_name);
 825         }
 826
 827         err = __cmd_script(session);
 828
 829         perf_session__delete(session);
 830         cleanup_scripting();
 831 out:
 832         return err;
 833 }