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(union perf_event *event,
  67                                 struct perf_sample *sample,
  68                                 struct perf_session *session)
  69 {
  70         struct thread *thread = perf_session__findnew(session, event->ip.pid);
  71
  72         if (thread == NULL) {
  73                 pr_debug("problem processing %d event, skipping it.\n",
  74                          event->header.type);
  75                 return -1;
  76         }
  77
  78         if (session->sample_type & PERF_SAMPLE_RAW) {
  79                 if (debug_mode) {
  80                         if (sample->time < last_timestamp) {
  81                                 pr_err("Samples misordered, previous: %" PRIu64
  82                                         " this: %" PRIu64 "\n", last_timestamp,
  83                                         sample->time);
  84                                 nr_unordered++;
  85                         }
  86                         last_timestamp = sample->time;
  87                         return 0;
  88                 }
  89                 /*
  90                  * FIXME: better resolve from pid from the struct trace_entry
  91                  * field, although it should be the same than this perf
  92                  * event pid
  93                  */
  94                 scripting_ops->process_event(sample->cpu, sample->raw_data,
  95                                              sample->raw_size,
  96                                              sample->time, thread->comm);
  97         }
  98
  99         session->hists.stats.total_period += sample->period;
 100         return 0;
 101 }
 102
 103 static struct perf_event_ops event_ops = {
 104         .sample          = process_sample_event,
 105         .comm            = perf_event__process_comm,
 106         .attr            = perf_event__process_attr,
 107         .event_type      = perf_event__process_event_type,
 108         .tracing_data    = perf_event__process_tracing_data,
 109         .build_id        = perf_event__process_build_id,
 110         .ordered_samples = true,
 111         .ordering_requires_timestamps = true,
 112 };
 113
 114 extern volatile int session_done;
 115
 116 static void sig_handler(int sig __unused)
 117 {
 118         session_done = 1;
 119 }
 120
 121 static int __cmd_script(struct perf_session *session)
 122 {
 123         int ret;
 124
 125         signal(SIGINT, sig_handler);
 126
 127         ret = perf_session__process_events(session, &event_ops);
 128
 129         if (debug_mode)
 130                 pr_err("Misordered timestamps: %" PRIu64 "\n", nr_unordered);
 131
 132         return ret;
 133 }
 134
 135 struct script_spec {
 136         struct list_head        node;
 137         struct scripting_ops    *ops;
 138         char                    spec[0];
 139 };
 140
 141 static LIST_HEAD(script_specs);
 142
 143 static struct script_spec *script_spec__new(const char *spec,
 144                                             struct scripting_ops *ops)
 145 {
 146         struct script_spec *s = malloc(sizeof(*s) + strlen(spec) + 1);
 147
 148         if (s != NULL) {
 149                 strcpy(s->spec, spec);
 150                 s->ops = ops;
 151         }
 152
 153         return s;
 154 }
 155
 156 static void script_spec__delete(struct script_spec *s)
 157 {
 158         free(s->spec);
 159         free(s);
 160 }
 161
 162 static void script_spec__add(struct script_spec *s)
 163 {
 164         list_add_tail(&s->node, &script_specs);
 165 }
 166
 167 static struct script_spec *script_spec__find(const char *spec)
 168 {
 169         struct script_spec *s;
 170
 171         list_for_each_entry(s, &script_specs, node)
 172                 if (strcasecmp(s->spec, spec) == 0)
 173                         return s;
 174         return NULL;
 175 }
 176
 177 static struct script_spec *script_spec__findnew(const char *spec,
 178                                                 struct scripting_ops *ops)
 179 {
 180         struct script_spec *s = script_spec__find(spec);
 181
 182         if (s)
 183                 return s;
 184
 185         s = script_spec__new(spec, ops);
 186         if (!s)
 187                 goto out_delete_spec;
 188
 189         script_spec__add(s);
 190
 191         return s;
 192
 193 out_delete_spec:
 194         script_spec__delete(s);
 195
 196         return NULL;
 197 }
 198
 199 int script_spec_register(const char *spec, struct scripting_ops *ops)
 200 {
 201         struct script_spec *s;
 202
 203         s = script_spec__find(spec);
 204         if (s)
 205                 return -1;
 206
 207         s = script_spec__findnew(spec, ops);
 208         if (!s)
 209                 return -1;
 210
 211         return 0;
 212 }
 213
 214 static struct scripting_ops *script_spec__lookup(const char *spec)
 215 {
 216         struct script_spec *s = script_spec__find(spec);
 217         if (!s)
 218                 return NULL;
 219
 220         return s->ops;
 221 }
 222
 223 static void list_available_languages(void)
 224 {
 225         struct script_spec *s;
 226
 227         fprintf(stderr, "\n");
 228         fprintf(stderr, "Scripting language extensions (used in "
 229                 "perf script -s [spec:]script.[spec]):\n\n");
 230
 231         list_for_each_entry(s, &script_specs, node)
 232                 fprintf(stderr, "  %-42s [%s]\n", s->spec, s->ops->name);
 233
 234         fprintf(stderr, "\n");
 235 }
 236
 237 static int parse_scriptname(const struct option *opt __used,
 238                             const char *str, int unset __used)
 239 {
 240         char spec[PATH_MAX];
 241         const char *script, *ext;
 242         int len;
 243
 244         if (strcmp(str, "lang") == 0) {
 245                 list_available_languages();
 246                 exit(0);
 247         }
 248
 249         script = strchr(str, ':');
 250         if (script) {
 251                 len = script - str;
 252                 if (len >= PATH_MAX) {
 253                         fprintf(stderr, "invalid language specifier");
 254                         return -1;
 255                 }
 256                 strncpy(spec, str, len);
 257                 spec[len] = '\0';
 258                 scripting_ops = script_spec__lookup(spec);
 259                 if (!scripting_ops) {
 260                         fprintf(stderr, "invalid language specifier");
 261                         return -1;
 262                 }
 263                 script++;
 264         } else {
 265                 script = str;
 266                 ext = strrchr(script, '.');
 267                 if (!ext) {
 268                         fprintf(stderr, "invalid script extension");
 269                         return -1;
 270                 }
 271                 scripting_ops = script_spec__lookup(++ext);
 272                 if (!scripting_ops) {
 273                         fprintf(stderr, "invalid script extension");
 274                         return -1;
 275                 }
 276         }
 277
 278         script_name = strdup(script);
 279
 280         return 0;
 281 }
 282
 283 /* Helper function for filesystems that return a dent->d_type DT_UNKNOWN */
 284 static int is_directory(const char *base_path, const struct dirent *dent)
 285 {
 286         char path[PATH_MAX];
 287         struct stat st;
 288
 289         sprintf(path, "%s/%s", base_path, dent->d_name);
 290         if (stat(path, &st))
 291                 return 0;
 292
 293         return S_ISDIR(st.st_mode);
 294 }
 295
 296 #define for_each_lang(scripts_path, scripts_dir, lang_dirent, lang_next)\
 297         while (!readdir_r(scripts_dir, &lang_dirent, &lang_next) &&     \
 298                lang_next)                                               \
 299                 if ((lang_dirent.d_type == DT_DIR ||                    \
 300                      (lang_dirent.d_type == DT_UNKNOWN &&               \
 301                       is_directory(scripts_path, &lang_dirent))) &&     \
 302                     (strcmp(lang_dirent.d_name, ".")) &&                \
 303                     (strcmp(lang_dirent.d_name, "..")))
 304
 305 #define for_each_script(lang_path, lang_dir, script_dirent, script_next)\
 306         while (!readdir_r(lang_dir, &script_dirent, &script_next) &&    \
 307                script_next)                                             \
 308                 if (script_dirent.d_type != DT_DIR &&                   \
 309                     (script_dirent.d_type != DT_UNKNOWN ||              \
 310                      !is_directory(lang_path, &script_dirent)))
 311
 312
 313 #define RECORD_SUFFIX                   "-record"
 314 #define REPORT_SUFFIX                   "-report"
 315
 316 struct script_desc {
 317         struct list_head        node;
 318         char                    *name;
 319         char                    *half_liner;
 320         char                    *args;
 321 };
 322
 323 static LIST_HEAD(script_descs);
 324
 325 static struct script_desc *script_desc__new(const char *name)
 326 {
 327         struct script_desc *s = zalloc(sizeof(*s));
 328
 329         if (s != NULL && name)
 330                 s->name = strdup(name);
 331
 332         return s;
 333 }
 334
 335 static void script_desc__delete(struct script_desc *s)
 336 {
 337         free(s->name);
 338         free(s->half_liner);
 339         free(s->args);
 340         free(s);
 341 }
 342
 343 static void script_desc__add(struct script_desc *s)
 344 {
 345         list_add_tail(&s->node, &script_descs);
 346 }
 347
 348 static struct script_desc *script_desc__find(const char *name)
 349 {
 350         struct script_desc *s;
 351
 352         list_for_each_entry(s, &script_descs, node)
 353                 if (strcasecmp(s->name, name) == 0)
 354                         return s;
 355         return NULL;
 356 }
 357
 358 static struct script_desc *script_desc__findnew(const char *name)
 359 {
 360         struct script_desc *s = script_desc__find(name);
 361
 362         if (s)
 363                 return s;
 364
 365         s = script_desc__new(name);
 366         if (!s)
 367                 goto out_delete_desc;
 368
 369         script_desc__add(s);
 370
 371         return s;
 372
 373 out_delete_desc:
 374         script_desc__delete(s);
 375
 376         return NULL;
 377 }
 378
 379 static const char *ends_with(const char *str, const char *suffix)
 380 {
 381         size_t suffix_len = strlen(suffix);
 382         const char *p = str;
 383
 384         if (strlen(str) > suffix_len) {
 385                 p = str + strlen(str) - suffix_len;
 386                 if (!strncmp(p, suffix, suffix_len))
 387                         return p;
 388         }
 389
 390         return NULL;
 391 }
 392
 393 static char *ltrim(char *str)
 394 {
 395         int len = strlen(str);
 396
 397         while (len && isspace(*str)) {
 398                 len--;
 399                 str++;
 400         }
 401
 402         return str;
 403 }
 404
 405 static int read_script_info(struct script_desc *desc, const char *filename)
 406 {
 407         char line[BUFSIZ], *p;
 408         FILE *fp;
 409
 410         fp = fopen(filename, "r");
 411         if (!fp)
 412                 return -1;
 413
 414         while (fgets(line, sizeof(line), fp)) {
 415                 p = ltrim(line);
 416                 if (strlen(p) == 0)
 417                         continue;
 418                 if (*p != '#')
 419                         continue;
 420                 p++;
 421                 if (strlen(p) && *p == '!')
 422                         continue;
 423
 424                 p = ltrim(p);
 425                 if (strlen(p) && p[strlen(p) - 1] == '\n')
 426                         p[strlen(p) - 1] = '\0';
 427
 428                 if (!strncmp(p, "description:", strlen("description:"))) {
 429                         p += strlen("description:");
 430                         desc->half_liner = strdup(ltrim(p));
 431                         continue;
 432                 }
 433
 434                 if (!strncmp(p, "args:", strlen("args:"))) {
 435                         p += strlen("args:");
 436                         desc->args = strdup(ltrim(p));
 437                         continue;
 438                 }
 439         }
 440
 441         fclose(fp);
 442
 443         return 0;
 444 }
 445
 446 static int list_available_scripts(const struct option *opt __used,
 447                                   const char *s __used, int unset __used)
 448 {
 449         struct dirent *script_next, *lang_next, script_dirent, lang_dirent;
 450         char scripts_path[MAXPATHLEN];
 451         DIR *scripts_dir, *lang_dir;
 452         char script_path[MAXPATHLEN];
 453         char lang_path[MAXPATHLEN];
 454         struct script_desc *desc;
 455         char first_half[BUFSIZ];
 456         char *script_root;
 457         char *str;
 458
 459         snprintf(scripts_path, MAXPATHLEN, "%s/scripts", perf_exec_path());
 460
 461         scripts_dir = opendir(scripts_path);
 462         if (!scripts_dir)
 463                 return -1;
 464
 465         for_each_lang(scripts_path, scripts_dir, lang_dirent, lang_next) {
 466                 snprintf(lang_path, MAXPATHLEN, "%s/%s/bin", scripts_path,
 467                          lang_dirent.d_name);
 468                 lang_dir = opendir(lang_path);
 469                 if (!lang_dir)
 470                         continue;
 471
 472                 for_each_script(lang_path, lang_dir, script_dirent, script_next) {
 473                         script_root = strdup(script_dirent.d_name);
 474                         str = (char *)ends_with(script_root, REPORT_SUFFIX);
 475                         if (str) {
 476                                 *str = '\0';
 477                                 desc = script_desc__findnew(script_root);
 478                                 snprintf(script_path, MAXPATHLEN, "%s/%s",
 479                                          lang_path, script_dirent.d_name);
 480                                 read_script_info(desc, script_path);
 481                         }
 482                         free(script_root);
 483                 }
 484         }
 485
 486         fprintf(stdout, "List of available trace scripts:\n");
 487         list_for_each_entry(desc, &script_descs, node) {
 488                 sprintf(first_half, "%s %s", desc->name,
 489                         desc->args ? desc->args : "");
 490                 fprintf(stdout, "  %-36s %s\n", first_half,
 491                         desc->half_liner ? desc->half_liner : "");
 492         }
 493
 494         exit(0);
 495 }
 496
 497 static char *get_script_path(const char *script_root, const char *suffix)
 498 {
 499         struct dirent *script_next, *lang_next, script_dirent, lang_dirent;
 500         char scripts_path[MAXPATHLEN];
 501         char script_path[MAXPATHLEN];
 502         DIR *scripts_dir, *lang_dir;
 503         char lang_path[MAXPATHLEN];
 504         char *str, *__script_root;
 505         char *path = NULL;
 506
 507         snprintf(scripts_path, MAXPATHLEN, "%s/scripts", perf_exec_path());
 508
 509         scripts_dir = opendir(scripts_path);
 510         if (!scripts_dir)
 511                 return NULL;
 512
 513         for_each_lang(scripts_path, scripts_dir, lang_dirent, lang_next) {
 514                 snprintf(lang_path, MAXPATHLEN, "%s/%s/bin", scripts_path,
 515                          lang_dirent.d_name);
 516                 lang_dir = opendir(lang_path);
 517                 if (!lang_dir)
 518                         continue;
 519
 520                 for_each_script(lang_path, lang_dir, script_dirent, script_next) {
 521                         __script_root = strdup(script_dirent.d_name);
 522                         str = (char *)ends_with(__script_root, suffix);
 523                         if (str) {
 524                                 *str = '\0';
 525                                 if (strcmp(__script_root, script_root))
 526                                         continue;
 527                                 snprintf(script_path, MAXPATHLEN, "%s/%s",
 528                                          lang_path, script_dirent.d_name);
 529                                 path = strdup(script_path);
 530                                 free(__script_root);
 531                                 break;
 532                         }
 533                         free(__script_root);
 534                 }
 535         }
 536
 537         return path;
 538 }
 539
 540 static bool is_top_script(const char *script_path)
 541 {
 542         return ends_with(script_path, "top") == NULL ? false : true;
 543 }
 544
 545 static int has_required_arg(char *script_path)
 546 {
 547         struct script_desc *desc;
 548         int n_args = 0;
 549         char *p;
 550
 551         desc = script_desc__new(NULL);
 552
 553         if (read_script_info(desc, script_path))
 554                 goto out;
 555
 556         if (!desc->args)
 557                 goto out;
 558
 559         for (p = desc->args; *p; p++)
 560                 if (*p == '<')
 561                         n_args++;
 562 out:
 563         script_desc__delete(desc);
 564
 565         return n_args;
 566 }
 567
 568 static const char * const script_usage[] = {
 569         "perf script [<options>]",
 570         "perf script [<options>] record <script> [<record-options>] <command>",
 571         "perf script [<options>] report <script> [script-args]",
 572         "perf script [<options>] <script> [<record-options>] <command>",
 573         "perf script [<options>] <top-script> [script-args]",
 574         NULL
 575 };
 576
 577 static const struct option options[] = {
 578         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
 579                     "dump raw trace in ASCII"),
 580         OPT_INCR('v', "verbose", &verbose,
 581                     "be more verbose (show symbol address, etc)"),
 582         OPT_BOOLEAN('L', "Latency", &latency_format,
 583                     "show latency attributes (irqs/preemption disabled, etc)"),
 584         OPT_CALLBACK_NOOPT('l', "list", NULL, NULL, "list available scripts",
 585                            list_available_scripts),
 586         OPT_CALLBACK('s', "script", NULL, "name",
 587                      "script file name (lang:script name, script name, or *)",
 588                      parse_scriptname),
 589         OPT_STRING('g', "gen-script", &generate_script_lang, "lang",
 590                    "generate perf-script.xx script in specified language"),
 591         OPT_STRING('i', "input", &input_name, "file",
 592                     "input file name"),
 593         OPT_BOOLEAN('d', "debug-mode", &debug_mode,
 594                    "do various checks like samples ordering and lost events"),
 595
 596         OPT_END()
 597 };
 598
 599 static bool have_cmd(int argc, const char **argv)
 600 {
 601         char **__argv = malloc(sizeof(const char *) * argc);
 602
 603         if (!__argv)
 604                 die("malloc");
 605         memcpy(__argv, argv, sizeof(const char *) * argc);
 606         argc = parse_options(argc, (const char **)__argv, record_options,
 607                              NULL, PARSE_OPT_STOP_AT_NON_OPTION);
 608         free(__argv);
 609
 610         return argc != 0;
 611 }
 612
 613 int cmd_script(int argc, const char **argv, const char *prefix __used)
 614 {
 615         char *rec_script_path = NULL;
 616         char *rep_script_path = NULL;
 617         struct perf_session *session;
 618         char *script_path = NULL;
 619         const char **__argv;
 620         bool system_wide;
 621         int i, j, err;
 622
 623         setup_scripting();
 624
 625         argc = parse_options(argc, argv, options, script_usage,
 626                              PARSE_OPT_STOP_AT_NON_OPTION);
 627
 628         if (argc > 1 && !strncmp(argv[0], "rec", strlen("rec"))) {
 629                 rec_script_path = get_script_path(argv[1], RECORD_SUFFIX);
 630                 if (!rec_script_path)
 631                         return cmd_record(argc, argv, NULL);
 632         }
 633
 634         if (argc > 1 && !strncmp(argv[0], "rep", strlen("rep"))) {
 635                 rep_script_path = get_script_path(argv[1], REPORT_SUFFIX);
 636                 if (!rep_script_path) {
 637                         fprintf(stderr,
 638                                 "Please specify a valid report script"
 639                                 "(see 'perf script -l' for listing)\n");
 640                         return -1;
 641                 }
 642         }
 643
 644         /* make sure PERF_EXEC_PATH is set for scripts */
 645         perf_set_argv_exec_path(perf_exec_path());
 646
 647         if (argc && !script_name && !rec_script_path && !rep_script_path) {
 648                 int live_pipe[2];
 649                 int rep_args;
 650                 pid_t pid;
 651
 652                 rec_script_path = get_script_path(argv[0], RECORD_SUFFIX);
 653                 rep_script_path = get_script_path(argv[0], REPORT_SUFFIX);
 654
 655                 if (!rec_script_path && !rep_script_path) {
 656                         fprintf(stderr, " Couldn't find script %s\n\n See perf"
 657                                 " script -l for available scripts.\n", argv[0]);
 658                         usage_with_options(script_usage, options);
 659                 }
 660
 661                 if (is_top_script(argv[0])) {
 662                         rep_args = argc - 1;
 663                 } else {
 664                         int rec_args;
 665
 666                         rep_args = has_required_arg(rep_script_path);
 667                         rec_args = (argc - 1) - rep_args;
 668                         if (rec_args < 0) {
 669                                 fprintf(stderr, " %s script requires options."
 670                                         "\n\n See perf script -l for available "
 671                                         "scripts and options.\n", argv[0]);
 672                                 usage_with_options(script_usage, options);
 673                         }
 674                 }
 675
 676                 if (pipe(live_pipe) < 0) {
 677                         perror("failed to create pipe");
 678                         exit(-1);
 679                 }
 680
 681                 pid = fork();
 682                 if (pid < 0) {
 683                         perror("failed to fork");
 684                         exit(-1);
 685                 }
 686
 687                 if (!pid) {
 688                         system_wide = true;
 689                         j = 0;
 690
 691                         dup2(live_pipe[1], 1);
 692                         close(live_pipe[0]);
 693
 694                         if (!is_top_script(argv[0]))
 695                                 system_wide = !have_cmd(argc - rep_args,
 696                                                         &argv[rep_args]);
 697
 698                         __argv = malloc((argc + 6) * sizeof(const char *));
 699                         if (!__argv)
 700                                 die("malloc");
 701
 702                         __argv[j++] = "/bin/sh";
 703                         __argv[j++] = rec_script_path;
 704                         if (system_wide)
 705                                 __argv[j++] = "-a";
 706                         __argv[j++] = "-q";
 707                         __argv[j++] = "-o";
 708                         __argv[j++] = "-";
 709                         for (i = rep_args + 1; i < argc; i++)
 710                                 __argv[j++] = argv[i];
 711                         __argv[j++] = NULL;
 712
 713                         execvp("/bin/sh", (char **)__argv);
 714                         free(__argv);
 715                         exit(-1);
 716                 }
 717
 718                 dup2(live_pipe[0], 0);
 719                 close(live_pipe[1]);
 720
 721                 __argv = malloc((argc + 4) * sizeof(const char *));
 722                 if (!__argv)
 723                         die("malloc");
 724                 j = 0;
 725                 __argv[j++] = "/bin/sh";
 726                 __argv[j++] = rep_script_path;
 727                 for (i = 1; i < rep_args + 1; i++)
 728                         __argv[j++] = argv[i];
 729                 __argv[j++] = "-i";
 730                 __argv[j++] = "-";
 731                 __argv[j++] = NULL;
 732
 733                 execvp("/bin/sh", (char **)__argv);
 734                 free(__argv);
 735                 exit(-1);
 736         }
 737
 738         if (rec_script_path)
 739                 script_path = rec_script_path;
 740         if (rep_script_path)
 741                 script_path = rep_script_path;
 742
 743         if (script_path) {
 744                 system_wide = false;
 745                 j = 0;
 746
 747                 if (rec_script_path)
 748                         system_wide = !have_cmd(argc - 1, &argv[1]);
 749
 750                 __argv = malloc((argc + 2) * sizeof(const char *));
 751                 if (!__argv)
 752                         die("malloc");
 753                 __argv[j++] = "/bin/sh";
 754                 __argv[j++] = script_path;
 755                 if (system_wide)
 756                         __argv[j++] = "-a";
 757                 for (i = 2; i < argc; i++)
 758                         __argv[j++] = argv[i];
 759                 __argv[j++] = NULL;
 760
 761                 execvp("/bin/sh", (char **)__argv);
 762                 free(__argv);
 763                 exit(-1);
 764         }
 765
 766         if (symbol__init() < 0)
 767                 return -1;
 768         if (!script_name)
 769                 setup_pager();
 770
 771         session = perf_session__new(input_name, O_RDONLY, 0, false, &event_ops);
 772         if (session == NULL)
 773                 return -ENOMEM;
 774
 775         if (strcmp(input_name, "-") &&
 776             !perf_session__has_traces(session, "record -R"))
 777                 return -EINVAL;
 778
 779         if (generate_script_lang) {
 780                 struct stat perf_stat;
 781
 782                 int input = open(input_name, O_RDONLY);
 783                 if (input < 0) {
 784                         perror("failed to open file");
 785                         exit(-1);
 786                 }
 787
 788                 err = fstat(input, &perf_stat);
 789                 if (err < 0) {
 790                         perror("failed to stat file");
 791                         exit(-1);
 792                 }
 793
 794                 if (!perf_stat.st_size) {
 795                         fprintf(stderr, "zero-sized file, nothing to do!\n");
 796                         exit(0);
 797                 }
 798
 799                 scripting_ops = script_spec__lookup(generate_script_lang);
 800                 if (!scripting_ops) {
 801                         fprintf(stderr, "invalid language specifier");
 802                         return -1;
 803                 }
 804
 805                 err = scripting_ops->generate_script("perf-script");
 806                 goto out;
 807         }
 808
 809         if (script_name) {
 810                 err = scripting_ops->start_script(script_name, argc, argv);
 811                 if (err)
 812                         goto out;
 813                 pr_debug("perf script started with script %s\n\n", script_name);
 814         }
 815
 816         err = __cmd_script(session);
 817
 818         perf_session__delete(session);
 819         cleanup_scripting();
 820 out:
 821         return err;
 822 }