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         .ordering_requires_timestamps = true,
 121         .ordered_samples = true,
 122 };
 123
 124 extern volatile int session_done;
 125
 126 static void sig_handler(int sig __unused)
 127 {
 128         session_done = 1;
 129 }
 130
 131 static int __cmd_script(struct perf_session *session)
 132 {
 133         int ret;
 134
 135         signal(SIGINT, sig_handler);
 136
 137         ret = perf_session__process_events(session, &event_ops);
 138
 139         if (debug_mode) {
 140                 pr_err("Misordered timestamps: %llu\n", nr_unordered);
 141                 pr_err("Lost events: %llu\n", nr_lost);
 142         }
 143
 144         return ret;
 145 }
 146
 147 struct script_spec {
 148         struct list_head        node;
 149         struct scripting_ops    *ops;
 150         char                    spec[0];
 151 };
 152
 153 LIST_HEAD(script_specs);
 154
 155 static struct script_spec *script_spec__new(const char *spec,
 156                                             struct scripting_ops *ops)
 157 {
 158         struct script_spec *s = malloc(sizeof(*s) + strlen(spec) + 1);
 159
 160         if (s != NULL) {
 161                 strcpy(s->spec, spec);
 162                 s->ops = ops;
 163         }
 164
 165         return s;
 166 }
 167
 168 static void script_spec__delete(struct script_spec *s)
 169 {
 170         free(s->spec);
 171         free(s);
 172 }
 173
 174 static void script_spec__add(struct script_spec *s)
 175 {
 176         list_add_tail(&s->node, &script_specs);
 177 }
 178
 179 static struct script_spec *script_spec__find(const char *spec)
 180 {
 181         struct script_spec *s;
 182
 183         list_for_each_entry(s, &script_specs, node)
 184                 if (strcasecmp(s->spec, spec) == 0)
 185                         return s;
 186         return NULL;
 187 }
 188
 189 static struct script_spec *script_spec__findnew(const char *spec,
 190                                                 struct scripting_ops *ops)
 191 {
 192         struct script_spec *s = script_spec__find(spec);
 193
 194         if (s)
 195                 return s;
 196
 197         s = script_spec__new(spec, ops);
 198         if (!s)
 199                 goto out_delete_spec;
 200
 201         script_spec__add(s);
 202
 203         return s;
 204
 205 out_delete_spec:
 206         script_spec__delete(s);
 207
 208         return NULL;
 209 }
 210
 211 int script_spec_register(const char *spec, struct scripting_ops *ops)
 212 {
 213         struct script_spec *s;
 214
 215         s = script_spec__find(spec);
 216         if (s)
 217                 return -1;
 218
 219         s = script_spec__findnew(spec, ops);
 220         if (!s)
 221                 return -1;
 222
 223         return 0;
 224 }
 225
 226 static struct scripting_ops *script_spec__lookup(const char *spec)
 227 {
 228         struct script_spec *s = script_spec__find(spec);
 229         if (!s)
 230                 return NULL;
 231
 232         return s->ops;
 233 }
 234
 235 static void list_available_languages(void)
 236 {
 237         struct script_spec *s;
 238
 239         fprintf(stderr, "\n");
 240         fprintf(stderr, "Scripting language extensions (used in "
 241                 "perf script -s [spec:]script.[spec]):\n\n");
 242
 243         list_for_each_entry(s, &script_specs, node)
 244                 fprintf(stderr, "  %-42s [%s]\n", s->spec, s->ops->name);
 245
 246         fprintf(stderr, "\n");
 247 }
 248
 249 static int parse_scriptname(const struct option *opt __used,
 250                             const char *str, int unset __used)
 251 {
 252         char spec[PATH_MAX];
 253         const char *script, *ext;
 254         int len;
 255
 256         if (strcmp(str, "lang") == 0) {
 257                 list_available_languages();
 258                 exit(0);
 259         }
 260
 261         script = strchr(str, ':');
 262         if (script) {
 263                 len = script - str;
 264                 if (len >= PATH_MAX) {
 265                         fprintf(stderr, "invalid language specifier");
 266                         return -1;
 267                 }
 268                 strncpy(spec, str, len);
 269                 spec[len] = '\0';
 270                 scripting_ops = script_spec__lookup(spec);
 271                 if (!scripting_ops) {
 272                         fprintf(stderr, "invalid language specifier");
 273                         return -1;
 274                 }
 275                 script++;
 276         } else {
 277                 script = str;
 278                 ext = strrchr(script, '.');
 279                 if (!ext) {
 280                         fprintf(stderr, "invalid script extension");
 281                         return -1;
 282                 }
 283                 scripting_ops = script_spec__lookup(++ext);
 284                 if (!scripting_ops) {
 285                         fprintf(stderr, "invalid script extension");
 286                         return -1;
 287                 }
 288         }
 289
 290         script_name = strdup(script);
 291
 292         return 0;
 293 }
 294
 295 /* Helper function for filesystems that return a dent->d_type DT_UNKNOWN */
 296 static int is_directory(const char *base_path, const struct dirent *dent)
 297 {
 298         char path[PATH_MAX];
 299         struct stat st;
 300
 301         sprintf(path, "%s/%s", base_path, dent->d_name);
 302         if (stat(path, &st))
 303                 return 0;
 304
 305         return S_ISDIR(st.st_mode);
 306 }
 307
 308 #define for_each_lang(scripts_path, scripts_dir, lang_dirent, lang_next)\
 309         while (!readdir_r(scripts_dir, &lang_dirent, &lang_next) &&     \
 310                lang_next)                                               \
 311                 if ((lang_dirent.d_type == DT_DIR ||                    \
 312                      (lang_dirent.d_type == DT_UNKNOWN &&               \
 313                       is_directory(scripts_path, &lang_dirent))) &&     \
 314                     (strcmp(lang_dirent.d_name, ".")) &&                \
 315                     (strcmp(lang_dirent.d_name, "..")))
 316
 317 #define for_each_script(lang_path, lang_dir, script_dirent, script_next)\
 318         while (!readdir_r(lang_dir, &script_dirent, &script_next) &&    \
 319                script_next)                                             \
 320                 if (script_dirent.d_type != DT_DIR &&                   \
 321                     (script_dirent.d_type != DT_UNKNOWN ||              \
 322                      !is_directory(lang_path, &script_dirent)))
 323
 324
 325 #define RECORD_SUFFIX                   "-record"
 326 #define REPORT_SUFFIX                   "-report"
 327
 328 struct script_desc {
 329         struct list_head        node;
 330         char                    *name;
 331         char                    *half_liner;
 332         char                    *args;
 333 };
 334
 335 LIST_HEAD(script_descs);
 336
 337 static struct script_desc *script_desc__new(const char *name)
 338 {
 339         struct script_desc *s = zalloc(sizeof(*s));
 340
 341         if (s != NULL && name)
 342                 s->name = strdup(name);
 343
 344         return s;
 345 }
 346
 347 static void script_desc__delete(struct script_desc *s)
 348 {
 349         free(s->name);
 350         free(s->half_liner);
 351         free(s->args);
 352         free(s);
 353 }
 354
 355 static void script_desc__add(struct script_desc *s)
 356 {
 357         list_add_tail(&s->node, &script_descs);
 358 }
 359
 360 static struct script_desc *script_desc__find(const char *name)
 361 {
 362         struct script_desc *s;
 363
 364         list_for_each_entry(s, &script_descs, node)
 365                 if (strcasecmp(s->name, name) == 0)
 366                         return s;
 367         return NULL;
 368 }
 369
 370 static struct script_desc *script_desc__findnew(const char *name)
 371 {
 372         struct script_desc *s = script_desc__find(name);
 373
 374         if (s)
 375                 return s;
 376
 377         s = script_desc__new(name);
 378         if (!s)
 379                 goto out_delete_desc;
 380
 381         script_desc__add(s);
 382
 383         return s;
 384
 385 out_delete_desc:
 386         script_desc__delete(s);
 387
 388         return NULL;
 389 }
 390
 391 static const char *ends_with(const char *str, const char *suffix)
 392 {
 393         size_t suffix_len = strlen(suffix);
 394         const char *p = str;
 395
 396         if (strlen(str) > suffix_len) {
 397                 p = str + strlen(str) - suffix_len;
 398                 if (!strncmp(p, suffix, suffix_len))
 399                         return p;
 400         }
 401
 402         return NULL;
 403 }
 404
 405 static char *ltrim(char *str)
 406 {
 407         int len = strlen(str);
 408
 409         while (len && isspace(*str)) {
 410                 len--;
 411                 str++;
 412         }
 413
 414         return str;
 415 }
 416
 417 static int read_script_info(struct script_desc *desc, const char *filename)
 418 {
 419         char line[BUFSIZ], *p;
 420         FILE *fp;
 421
 422         fp = fopen(filename, "r");
 423         if (!fp)
 424                 return -1;
 425
 426         while (fgets(line, sizeof(line), fp)) {
 427                 p = ltrim(line);
 428                 if (strlen(p) == 0)
 429                         continue;
 430                 if (*p != '#')
 431                         continue;
 432                 p++;
 433                 if (strlen(p) && *p == '!')
 434                         continue;
 435
 436                 p = ltrim(p);
 437                 if (strlen(p) && p[strlen(p) - 1] == '\n')
 438                         p[strlen(p) - 1] = '\0';
 439
 440                 if (!strncmp(p, "description:", strlen("description:"))) {
 441                         p += strlen("description:");
 442                         desc->half_liner = strdup(ltrim(p));
 443                         continue;
 444                 }
 445
 446                 if (!strncmp(p, "args:", strlen("args:"))) {
 447                         p += strlen("args:");
 448                         desc->args = strdup(ltrim(p));
 449                         continue;
 450                 }
 451         }
 452
 453         fclose(fp);
 454
 455         return 0;
 456 }
 457
 458 static int list_available_scripts(const struct option *opt __used,
 459                                   const char *s __used, int unset __used)
 460 {
 461         struct dirent *script_next, *lang_next, script_dirent, lang_dirent;
 462         char scripts_path[MAXPATHLEN];
 463         DIR *scripts_dir, *lang_dir;
 464         char script_path[MAXPATHLEN];
 465         char lang_path[MAXPATHLEN];
 466         struct script_desc *desc;
 467         char first_half[BUFSIZ];
 468         char *script_root;
 469         char *str;
 470
 471         snprintf(scripts_path, MAXPATHLEN, "%s/scripts", perf_exec_path());
 472
 473         scripts_dir = opendir(scripts_path);
 474         if (!scripts_dir)
 475                 return -1;
 476
 477         for_each_lang(scripts_path, scripts_dir, lang_dirent, lang_next) {
 478                 snprintf(lang_path, MAXPATHLEN, "%s/%s/bin", scripts_path,
 479                          lang_dirent.d_name);
 480                 lang_dir = opendir(lang_path);
 481                 if (!lang_dir)
 482                         continue;
 483
 484                 for_each_script(lang_path, lang_dir, script_dirent, script_next) {
 485                         script_root = strdup(script_dirent.d_name);
 486                         str = (char *)ends_with(script_root, REPORT_SUFFIX);
 487                         if (str) {
 488                                 *str = '\0';
 489                                 desc = script_desc__findnew(script_root);
 490                                 snprintf(script_path, MAXPATHLEN, "%s/%s",
 491                                          lang_path, script_dirent.d_name);
 492                                 read_script_info(desc, script_path);
 493                         }
 494                         free(script_root);
 495                 }
 496         }
 497
 498         fprintf(stdout, "List of available trace scripts:\n");
 499         list_for_each_entry(desc, &script_descs, node) {
 500                 sprintf(first_half, "%s %s", desc->name,
 501                         desc->args ? desc->args : "");
 502                 fprintf(stdout, "  %-36s %s\n", first_half,
 503                         desc->half_liner ? desc->half_liner : "");
 504         }
 505
 506         exit(0);
 507 }
 508
 509 static char *get_script_path(const char *script_root, const char *suffix)
 510 {
 511         struct dirent *script_next, *lang_next, script_dirent, lang_dirent;
 512         char scripts_path[MAXPATHLEN];
 513         char script_path[MAXPATHLEN];
 514         DIR *scripts_dir, *lang_dir;
 515         char lang_path[MAXPATHLEN];
 516         char *str, *__script_root;
 517         char *path = NULL;
 518
 519         snprintf(scripts_path, MAXPATHLEN, "%s/scripts", perf_exec_path());
 520
 521         scripts_dir = opendir(scripts_path);
 522         if (!scripts_dir)
 523                 return NULL;
 524
 525         for_each_lang(scripts_path, scripts_dir, lang_dirent, lang_next) {
 526                 snprintf(lang_path, MAXPATHLEN, "%s/%s/bin", scripts_path,
 527                          lang_dirent.d_name);
 528                 lang_dir = opendir(lang_path);
 529                 if (!lang_dir)
 530                         continue;
 531
 532                 for_each_script(lang_path, lang_dir, script_dirent, script_next) {
 533                         __script_root = strdup(script_dirent.d_name);
 534                         str = (char *)ends_with(__script_root, suffix);
 535                         if (str) {
 536                                 *str = '\0';
 537                                 if (strcmp(__script_root, script_root))
 538                                         continue;
 539                                 snprintf(script_path, MAXPATHLEN, "%s/%s",
 540                                          lang_path, script_dirent.d_name);
 541                                 path = strdup(script_path);
 542                                 free(__script_root);
 543                                 break;
 544                         }
 545                         free(__script_root);
 546                 }
 547         }
 548
 549         return path;
 550 }
 551
 552 static bool is_top_script(const char *script_path)
 553 {
 554         return ends_with(script_path, "top") == NULL ? false : true;
 555 }
 556
 557 static int has_required_arg(char *script_path)
 558 {
 559         struct script_desc *desc;
 560         int n_args = 0;
 561         char *p;
 562
 563         desc = script_desc__new(NULL);
 564
 565         if (read_script_info(desc, script_path))
 566                 goto out;
 567
 568         if (!desc->args)
 569                 goto out;
 570
 571         for (p = desc->args; *p; p++)
 572                 if (*p == '<')
 573                         n_args++;
 574 out:
 575         script_desc__delete(desc);
 576
 577         return n_args;
 578 }
 579
 580 static const char * const script_usage[] = {
 581         "perf script [<options>]",
 582         "perf script [<options>] record <script> [<record-options>] <command>",
 583         "perf script [<options>] report <script> [script-args]",
 584         "perf script [<options>] <script> [<record-options>] <command>",
 585         "perf script [<options>] <top-script> [script-args]",
 586         NULL
 587 };
 588
 589 static const struct option options[] = {
 590         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
 591                     "dump raw trace in ASCII"),
 592         OPT_INCR('v', "verbose", &verbose,
 593                     "be more verbose (show symbol address, etc)"),
 594         OPT_BOOLEAN('L', "Latency", &latency_format,
 595                     "show latency attributes (irqs/preemption disabled, etc)"),
 596         OPT_CALLBACK_NOOPT('l', "list", NULL, NULL, "list available scripts",
 597                            list_available_scripts),
 598         OPT_CALLBACK('s', "script", NULL, "name",
 599                      "script file name (lang:script name, script name, or *)",
 600                      parse_scriptname),
 601         OPT_STRING('g', "gen-script", &generate_script_lang, "lang",
 602                    "generate perf-script.xx script in specified language"),
 603         OPT_STRING('i', "input", &input_name, "file",
 604                     "input file name"),
 605         OPT_BOOLEAN('d', "debug-mode", &debug_mode,
 606                    "do various checks like samples ordering and lost events"),
 607
 608         OPT_END()
 609 };
 610
 611 static bool have_cmd(int argc, const char **argv)
 612 {
 613         char **__argv = malloc(sizeof(const char *) * argc);
 614
 615         if (!__argv)
 616                 die("malloc");
 617         memcpy(__argv, argv, sizeof(const char *) * argc);
 618         argc = parse_options(argc, (const char **)__argv, record_options,
 619                              NULL, PARSE_OPT_STOP_AT_NON_OPTION);
 620         free(__argv);
 621
 622         return argc != 0;
 623 }
 624
 625 int cmd_script(int argc, const char **argv, const char *prefix __used)
 626 {
 627         char *rec_script_path = NULL;
 628         char *rep_script_path = NULL;
 629         struct perf_session *session;
 630         char *script_path = NULL;
 631         const char **__argv;
 632         bool system_wide;
 633         int i, j, err;
 634
 635         setup_scripting();
 636
 637         argc = parse_options(argc, argv, options, script_usage,
 638                              PARSE_OPT_STOP_AT_NON_OPTION);
 639
 640         if (argc > 1 && !strncmp(argv[0], "rec", strlen("rec"))) {
 641                 rec_script_path = get_script_path(argv[1], RECORD_SUFFIX);
 642                 if (!rec_script_path)
 643                         return cmd_record(argc, argv, NULL);
 644         }
 645
 646         if (argc > 1 && !strncmp(argv[0], "rep", strlen("rep"))) {
 647                 rep_script_path = get_script_path(argv[1], REPORT_SUFFIX);
 648                 if (!rep_script_path) {
 649                         fprintf(stderr,
 650                                 "Please specify a valid report script"
 651                                 "(see 'perf script -l' for listing)\n");
 652                         return -1;
 653                 }
 654         }
 655
 656         /* make sure PERF_EXEC_PATH is set for scripts */
 657         perf_set_argv_exec_path(perf_exec_path());
 658
 659         if (argc && !script_name && !rec_script_path && !rep_script_path) {
 660                 int live_pipe[2];
 661                 int rep_args;
 662                 pid_t pid;
 663
 664                 rec_script_path = get_script_path(argv[0], RECORD_SUFFIX);
 665                 rep_script_path = get_script_path(argv[0], REPORT_SUFFIX);
 666
 667                 if (!rec_script_path && !rep_script_path) {
 668                         fprintf(stderr, " Couldn't find script %s\n\n See perf"
 669                                 " script -l for available scripts.\n", argv[0]);
 670                         usage_with_options(script_usage, options);
 671                 }
 672
 673                 if (is_top_script(argv[0])) {
 674                         rep_args = argc - 1;
 675                 } else {
 676                         int rec_args;
 677
 678                         rep_args = has_required_arg(rep_script_path);
 679                         rec_args = (argc - 1) - rep_args;
 680                         if (rec_args < 0) {
 681                                 fprintf(stderr, " %s script requires options."
 682                                         "\n\n See perf script -l for available "
 683                                         "scripts and options.\n", argv[0]);
 684                                 usage_with_options(script_usage, options);
 685                         }
 686                 }
 687
 688                 if (pipe(live_pipe) < 0) {
 689                         perror("failed to create pipe");
 690                         exit(-1);
 691                 }
 692
 693                 pid = fork();
 694                 if (pid < 0) {
 695                         perror("failed to fork");
 696                         exit(-1);
 697                 }
 698
 699                 if (!pid) {
 700                         system_wide = true;
 701                         j = 0;
 702
 703                         dup2(live_pipe[1], 1);
 704                         close(live_pipe[0]);
 705
 706                         if (!is_top_script(argv[0]))
 707                                 system_wide = !have_cmd(argc - rep_args,
 708                                                         &argv[rep_args]);
 709
 710                         __argv = malloc((argc + 6) * sizeof(const char *));
 711                         if (!__argv)
 712                                 die("malloc");
 713
 714                         __argv[j++] = "/bin/sh";
 715                         __argv[j++] = rec_script_path;
 716                         if (system_wide)
 717                                 __argv[j++] = "-a";
 718                         __argv[j++] = "-q";
 719                         __argv[j++] = "-o";
 720                         __argv[j++] = "-";
 721                         for (i = rep_args + 1; i < argc; i++)
 722                                 __argv[j++] = argv[i];
 723                         __argv[j++] = NULL;
 724
 725                         execvp("/bin/sh", (char **)__argv);
 726                         free(__argv);
 727                         exit(-1);
 728                 }
 729
 730                 dup2(live_pipe[0], 0);
 731                 close(live_pipe[1]);
 732
 733                 __argv = malloc((argc + 4) * sizeof(const char *));
 734                 if (!__argv)
 735                         die("malloc");
 736                 j = 0;
 737                 __argv[j++] = "/bin/sh";
 738                 __argv[j++] = rep_script_path;
 739                 for (i = 1; i < rep_args + 1; i++)
 740                         __argv[j++] = argv[i];
 741                 __argv[j++] = "-i";
 742                 __argv[j++] = "-";
 743                 __argv[j++] = NULL;
 744
 745                 execvp("/bin/sh", (char **)__argv);
 746                 free(__argv);
 747                 exit(-1);
 748         }
 749
 750         if (rec_script_path)
 751                 script_path = rec_script_path;
 752         if (rep_script_path)
 753                 script_path = rep_script_path;
 754
 755         if (script_path) {
 756                 system_wide = false;
 757                 j = 0;
 758
 759                 if (rec_script_path)
 760                         system_wide = !have_cmd(argc - 1, &argv[1]);
 761
 762                 __argv = malloc((argc + 2) * sizeof(const char *));
 763                 if (!__argv)
 764                         die("malloc");
 765                 __argv[j++] = "/bin/sh";
 766                 __argv[j++] = script_path;
 767                 if (system_wide)
 768                         __argv[j++] = "-a";
 769                 for (i = 2; i < argc; i++)
 770                         __argv[j++] = argv[i];
 771                 __argv[j++] = NULL;
 772
 773                 execvp("/bin/sh", (char **)__argv);
 774                 free(__argv);
 775                 exit(-1);
 776         }
 777
 778         if (symbol__init() < 0)
 779                 return -1;
 780         if (!script_name)
 781                 setup_pager();
 782
 783         session = perf_session__new(input_name, O_RDONLY, 0, false, &event_ops);
 784         if (session == NULL)
 785                 return -ENOMEM;
 786
 787         if (strcmp(input_name, "-") &&
 788             !perf_session__has_traces(session, "record -R"))
 789                 return -EINVAL;
 790
 791         if (generate_script_lang) {
 792                 struct stat perf_stat;
 793
 794                 int input = open(input_name, O_RDONLY);
 795                 if (input < 0) {
 796                         perror("failed to open file");
 797                         exit(-1);
 798                 }
 799
 800                 err = fstat(input, &perf_stat);
 801                 if (err < 0) {
 802                         perror("failed to stat file");
 803                         exit(-1);
 804                 }
 805
 806                 if (!perf_stat.st_size) {
 807                         fprintf(stderr, "zero-sized file, nothing to do!\n");
 808                         exit(0);
 809                 }
 810
 811                 scripting_ops = script_spec__lookup(generate_script_lang);
 812                 if (!scripting_ops) {
 813                         fprintf(stderr, "invalid language specifier");
 814                         return -1;
 815                 }
 816
 817                 err = scripting_ops->generate_script("perf-script");
 818                 goto out;
 819         }
 820
 821         if (script_name) {
 822                 err = scripting_ops->start_script(script_name, argc, argv);
 823                 if (err)
 824                         goto out;
 825                 pr_debug("perf script started with script %s\n\n", script_name);
 826         }
 827
 828         err = __cmd_script(session);
 829
 830         perf_session__delete(session);
 831         cleanup_scripting();
 832 out:
 833         return err;
 834 }