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