tools/perf/util/scripting-engines/trace-event-python.c

   1 /*
   2  * trace-event-python.  Feed trace events to an embedded Python interpreter.
   3  *
   4  * Copyright (C) 2010 Tom Zanussi <tzanussi@gmail.com>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  */
  21
  22 #include <Python.h>
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <errno.h>
  28
  29 #include "../../perf.h"
  30 #include "../evsel.h"
  31 #include "../util.h"
  32 #include "../event.h"
  33 #include "../thread.h"
  34 #include "../trace-event.h"
  35
  36 PyMODINIT_FUNC initperf_trace_context(void);
  37
  38 #define FTRACE_MAX_EVENT                                \
  39         ((1 << (sizeof(unsigned short) * 8)) - 1)
  40
  41 struct event_format *events[FTRACE_MAX_EVENT];
  42
  43 #define MAX_FIELDS      64
  44 #define N_COMMON_FIELDS 7
  45
  46 extern struct scripting_context *scripting_context;
  47
  48 static char *cur_field_name;
  49 static int zero_flag_atom;
  50
  51 static PyObject *main_module, *main_dict;
  52
  53 static void handler_call_die(const char *handler_name)
  54 {
  55         PyErr_Print();
  56         Py_FatalError("problem in Python trace event handler");
  57 }
  58
  59 /*
  60  * Insert val into into the dictionary and decrement the reference counter.
  61  * This is necessary for dictionaries since PyDict_SetItemString() does not
  62  * steal a reference, as opposed to PyTuple_SetItem().
  63  */
  64 static void pydict_set_item_string_decref(PyObject *dict, const char *key, PyObject *val)
  65 {
  66         PyDict_SetItemString(dict, key, val);
  67         Py_DECREF(val);
  68 }
  69
  70 static void define_value(enum print_arg_type field_type,
  71                          const char *ev_name,
  72                          const char *field_name,
  73                          const char *field_value,
  74                          const char *field_str)
  75 {
  76         const char *handler_name = "define_flag_value";
  77         PyObject *handler, *t, *retval;
  78         unsigned long long value;
  79         unsigned n = 0;
  80
  81         if (field_type == PRINT_SYMBOL)
  82                 handler_name = "define_symbolic_value";
  83
  84         t = PyTuple_New(4);
  85         if (!t)
  86                 Py_FatalError("couldn't create Python tuple");
  87
  88         value = eval_flag(field_value);
  89
  90         PyTuple_SetItem(t, n++, PyString_FromString(ev_name));
  91         PyTuple_SetItem(t, n++, PyString_FromString(field_name));
  92         PyTuple_SetItem(t, n++, PyInt_FromLong(value));
  93         PyTuple_SetItem(t, n++, PyString_FromString(field_str));
  94
  95         handler = PyDict_GetItemString(main_dict, handler_name);
  96         if (handler && PyCallable_Check(handler)) {
  97                 retval = PyObject_CallObject(handler, t);
  98                 if (retval == NULL)
  99                         handler_call_die(handler_name);
 100         }
 101
 102         Py_DECREF(t);
 103 }
 104
 105 static void define_values(enum print_arg_type field_type,
 106                           struct print_flag_sym *field,
 107                           const char *ev_name,
 108                           const char *field_name)
 109 {
 110         define_value(field_type, ev_name, field_name, field->value,
 111                      field->str);
 112
 113         if (field->next)
 114                 define_values(field_type, field->next, ev_name, field_name);
 115 }
 116
 117 static void define_field(enum print_arg_type field_type,
 118                          const char *ev_name,
 119                          const char *field_name,
 120                          const char *delim)
 121 {
 122         const char *handler_name = "define_flag_field";
 123         PyObject *handler, *t, *retval;
 124         unsigned n = 0;
 125
 126         if (field_type == PRINT_SYMBOL)
 127                 handler_name = "define_symbolic_field";
 128
 129         if (field_type == PRINT_FLAGS)
 130                 t = PyTuple_New(3);
 131         else
 132                 t = PyTuple_New(2);
 133         if (!t)
 134                 Py_FatalError("couldn't create Python tuple");
 135
 136         PyTuple_SetItem(t, n++, PyString_FromString(ev_name));
 137         PyTuple_SetItem(t, n++, PyString_FromString(field_name));
 138         if (field_type == PRINT_FLAGS)
 139                 PyTuple_SetItem(t, n++, PyString_FromString(delim));
 140
 141         handler = PyDict_GetItemString(main_dict, handler_name);
 142         if (handler && PyCallable_Check(handler)) {
 143                 retval = PyObject_CallObject(handler, t);
 144                 if (retval == NULL)
 145                         handler_call_die(handler_name);
 146         }
 147
 148         Py_DECREF(t);
 149 }
 150
 151 static void define_event_symbols(struct event_format *event,
 152                                  const char *ev_name,
 153                                  struct print_arg *args)
 154 {
 155         switch (args->type) {
 156         case PRINT_NULL:
 157                 break;
 158         case PRINT_ATOM:
 159                 define_value(PRINT_FLAGS, ev_name, cur_field_name, "0",
 160                              args->atom.atom);
 161                 zero_flag_atom = 0;
 162                 break;
 163         case PRINT_FIELD:
 164                 free(cur_field_name);
 165                 cur_field_name = strdup(args->field.name);
 166                 break;
 167         case PRINT_FLAGS:
 168                 define_event_symbols(event, ev_name, args->flags.field);
 169                 define_field(PRINT_FLAGS, ev_name, cur_field_name,
 170                              args->flags.delim);
 171                 define_values(PRINT_FLAGS, args->flags.flags, ev_name,
 172                               cur_field_name);
 173                 break;
 174         case PRINT_SYMBOL:
 175                 define_event_symbols(event, ev_name, args->symbol.field);
 176                 define_field(PRINT_SYMBOL, ev_name, cur_field_name, NULL);
 177                 define_values(PRINT_SYMBOL, args->symbol.symbols, ev_name,
 178                               cur_field_name);
 179                 break;
 180         case PRINT_HEX:
 181                 define_event_symbols(event, ev_name, args->hex.field);
 182                 define_event_symbols(event, ev_name, args->hex.size);
 183                 break;
 184         case PRINT_STRING:
 185                 break;
 186         case PRINT_TYPE:
 187                 define_event_symbols(event, ev_name, args->typecast.item);
 188                 break;
 189         case PRINT_OP:
 190                 if (strcmp(args->op.op, ":") == 0)
 191                         zero_flag_atom = 1;
 192                 define_event_symbols(event, ev_name, args->op.left);
 193                 define_event_symbols(event, ev_name, args->op.right);
 194                 break;
 195         default:
 196                 /* gcc warns for these? */
 197         case PRINT_BSTRING:
 198         case PRINT_DYNAMIC_ARRAY:
 199         case PRINT_FUNC:
 200                 /* we should warn... */
 201                 return;
 202         }
 203
 204         if (args->next)
 205                 define_event_symbols(event, ev_name, args->next);
 206 }
 207
 208 static inline struct event_format *find_cache_event(struct perf_evsel *evsel)
 209 {
 210         static char ev_name[256];
 211         struct event_format *event;
 212         int type = evsel->attr.config;
 213
 214         /*
 215          * XXX: Do we really need to cache this since now we have evsel->tp_format
 216          * cached already? Need to re-read this "cache" routine that as well calls
 217          * define_event_symbols() :-\
 218          */
 219         if (events[type])
 220                 return events[type];
 221
 222         events[type] = event = evsel->tp_format;
 223         if (!event)
 224                 return NULL;
 225
 226         sprintf(ev_name, "%s__%s", event->system, event->name);
 227
 228         define_event_symbols(event, ev_name, event->print_fmt.args);
 229
 230         return event;
 231 }
 232
 233 static void python_process_tracepoint(struct perf_sample *sample,
 234                                       struct perf_evsel *evsel,
 235                                       struct thread *thread,
 236                                       struct addr_location *al)
 237 {
 238         PyObject *handler, *retval, *context, *t, *obj, *dict = NULL;
 239         static char handler_name[256];
 240         struct format_field *field;
 241         unsigned long long val;
 242         unsigned long s, ns;
 243         struct event_format *event;
 244         unsigned n = 0;
 245         int pid;
 246         int cpu = sample->cpu;
 247         void *data = sample->raw_data;
 248         unsigned long long nsecs = sample->time;
 249         const char *comm = thread__comm_str(thread);
 250
 251         t = PyTuple_New(MAX_FIELDS);
 252         if (!t)
 253                 Py_FatalError("couldn't create Python tuple");
 254
 255         event = find_cache_event(evsel);
 256         if (!event)
 257                 die("ug! no event found for type %d", (int)evsel->attr.config);
 258
 259         pid = raw_field_value(event, "common_pid", data);
 260
 261         sprintf(handler_name, "%s__%s", event->system, event->name);
 262
 263         handler = PyDict_GetItemString(main_dict, handler_name);
 264         if (handler && !PyCallable_Check(handler))
 265                 handler = NULL;
 266         if (!handler) {
 267                 dict = PyDict_New();
 268                 if (!dict)
 269                         Py_FatalError("couldn't create Python dict");
 270         }
 271         s = nsecs / NSECS_PER_SEC;
 272         ns = nsecs - s * NSECS_PER_SEC;
 273
 274         scripting_context->event_data = data;
 275         scripting_context->pevent = evsel->tp_format->pevent;
 276
 277         context = PyCObject_FromVoidPtr(scripting_context, NULL);
 278
 279         PyTuple_SetItem(t, n++, PyString_FromString(handler_name));
 280         PyTuple_SetItem(t, n++, context);
 281
 282         if (handler) {
 283                 PyTuple_SetItem(t, n++, PyInt_FromLong(cpu));
 284                 PyTuple_SetItem(t, n++, PyInt_FromLong(s));
 285                 PyTuple_SetItem(t, n++, PyInt_FromLong(ns));
 286                 PyTuple_SetItem(t, n++, PyInt_FromLong(pid));
 287                 PyTuple_SetItem(t, n++, PyString_FromString(comm));
 288         } else {
 289                 pydict_set_item_string_decref(dict, "common_cpu", PyInt_FromLong(cpu));
 290                 pydict_set_item_string_decref(dict, "common_s", PyInt_FromLong(s));
 291                 pydict_set_item_string_decref(dict, "common_ns", PyInt_FromLong(ns));
 292                 pydict_set_item_string_decref(dict, "common_pid", PyInt_FromLong(pid));
 293                 pydict_set_item_string_decref(dict, "common_comm", PyString_FromString(comm));
 294         }
 295         for (field = event->format.fields; field; field = field->next) {
 296                 if (field->flags & FIELD_IS_STRING) {
 297                         int offset;
 298                         if (field->flags & FIELD_IS_DYNAMIC) {
 299                                 offset = *(int *)(data + field->offset);
 300                                 offset &= 0xffff;
 301                         } else
 302                                 offset = field->offset;
 303                         obj = PyString_FromString((char *)data + offset);
 304                 } else { /* FIELD_IS_NUMERIC */
 305                         val = read_size(event, data + field->offset,
 306                                         field->size);
 307                         if (field->flags & FIELD_IS_SIGNED) {
 308                                 if ((long long)val >= LONG_MIN &&
 309                                     (long long)val <= LONG_MAX)
 310                                         obj = PyInt_FromLong(val);
 311                                 else
 312                                         obj = PyLong_FromLongLong(val);
 313                         } else {
 314                                 if (val <= LONG_MAX)
 315                                         obj = PyInt_FromLong(val);
 316                                 else
 317                                         obj = PyLong_FromUnsignedLongLong(val);
 318                         }
 319                 }
 320                 if (handler)
 321                         PyTuple_SetItem(t, n++, obj);
 322                 else
 323                         pydict_set_item_string_decref(dict, field->name, obj);
 324
 325         }
 326         if (!handler)
 327                 PyTuple_SetItem(t, n++, dict);
 328
 329         if (_PyTuple_Resize(&t, n) == -1)
 330                 Py_FatalError("error resizing Python tuple");
 331
 332         if (handler) {
 333                 retval = PyObject_CallObject(handler, t);
 334                 if (retval == NULL)
 335                         handler_call_die(handler_name);
 336         } else {
 337                 handler = PyDict_GetItemString(main_dict, "trace_unhandled");
 338                 if (handler && PyCallable_Check(handler)) {
 339
 340                         retval = PyObject_CallObject(handler, t);
 341                         if (retval == NULL)
 342                                 handler_call_die("trace_unhandled");
 343                 }
 344                 Py_DECREF(dict);
 345         }
 346
 347         Py_DECREF(t);
 348 }
 349
 350 static void python_process_general_event(struct perf_sample *sample,
 351                                          struct perf_evsel *evsel,
 352                                          struct thread *thread,
 353                                          struct addr_location *al)
 354 {
 355         PyObject *handler, *retval, *t, *dict;
 356         static char handler_name[64];
 357         unsigned n = 0;
 358
 359         /*
 360          * Use the MAX_FIELDS to make the function expandable, though
 361          * currently there is only one item for the tuple.
 362          */
 363         t = PyTuple_New(MAX_FIELDS);
 364         if (!t)
 365                 Py_FatalError("couldn't create Python tuple");
 366
 367         dict = PyDict_New();
 368         if (!dict)
 369                 Py_FatalError("couldn't create Python dictionary");
 370
 371         snprintf(handler_name, sizeof(handler_name), "%s", "process_event");
 372
 373         handler = PyDict_GetItemString(main_dict, handler_name);
 374         if (!handler || !PyCallable_Check(handler))
 375                 goto exit;
 376
 377         pydict_set_item_string_decref(dict, "ev_name", PyString_FromString(perf_evsel__name(evsel)));
 378         pydict_set_item_string_decref(dict, "attr", PyString_FromStringAndSize(
 379                         (const char *)&evsel->attr, sizeof(evsel->attr)));
 380         pydict_set_item_string_decref(dict, "sample", PyString_FromStringAndSize(
 381                         (const char *)sample, sizeof(*sample)));
 382         pydict_set_item_string_decref(dict, "raw_buf", PyString_FromStringAndSize(
 383                         (const char *)sample->raw_data, sample->raw_size));
 384         pydict_set_item_string_decref(dict, "comm",
 385                         PyString_FromString(thread__comm_str(thread)));
 386         if (al->map) {
 387                 pydict_set_item_string_decref(dict, "dso",
 388                         PyString_FromString(al->map->dso->name));
 389         }
 390         if (al->sym) {
 391                 pydict_set_item_string_decref(dict, "symbol",
 392                         PyString_FromString(al->sym->name));
 393         }
 394
 395         PyTuple_SetItem(t, n++, dict);
 396         if (_PyTuple_Resize(&t, n) == -1)
 397                 Py_FatalError("error resizing Python tuple");
 398
 399         retval = PyObject_CallObject(handler, t);
 400         if (retval == NULL)
 401                 handler_call_die(handler_name);
 402 exit:
 403         Py_DECREF(dict);
 404         Py_DECREF(t);
 405 }
 406
 407 static void python_process_event(union perf_event *event __maybe_unused,
 408                                  struct perf_sample *sample,
 409                                  struct perf_evsel *evsel,
 410                                  struct thread *thread,
 411                                  struct addr_location *al)
 412 {
 413         switch (evsel->attr.type) {
 414         case PERF_TYPE_TRACEPOINT:
 415                 python_process_tracepoint(sample, evsel, thread, al);
 416                 break;
 417         /* Reserve for future process_hw/sw/raw APIs */
 418         default:
 419                 python_process_general_event(sample, evsel, thread, al);
 420         }
 421 }
 422
 423 static int run_start_sub(void)
 424 {
 425         PyObject *handler, *retval;
 426         int err = 0;
 427
 428         main_module = PyImport_AddModule("__main__");
 429         if (main_module == NULL)
 430                 return -1;
 431         Py_INCREF(main_module);
 432
 433         main_dict = PyModule_GetDict(main_module);
 434         if (main_dict == NULL) {
 435                 err = -1;
 436                 goto error;
 437         }
 438         Py_INCREF(main_dict);
 439
 440         handler = PyDict_GetItemString(main_dict, "trace_begin");
 441         if (handler == NULL || !PyCallable_Check(handler))
 442                 goto out;
 443
 444         retval = PyObject_CallObject(handler, NULL);
 445         if (retval == NULL)
 446                 handler_call_die("trace_begin");
 447
 448         Py_DECREF(retval);
 449         return err;
 450 error:
 451         Py_XDECREF(main_dict);
 452         Py_XDECREF(main_module);
 453 out:
 454         return err;
 455 }
 456
 457 /*
 458  * Start trace script
 459  */
 460 static int python_start_script(const char *script, int argc, const char **argv)
 461 {
 462         const char **command_line;
 463         char buf[PATH_MAX];
 464         int i, err = 0;
 465         FILE *fp;
 466
 467         command_line = malloc((argc + 1) * sizeof(const char *));
 468         command_line[0] = script;
 469         for (i = 1; i < argc + 1; i++)
 470                 command_line[i] = argv[i - 1];
 471
 472         Py_Initialize();
 473
 474         initperf_trace_context();
 475
 476         PySys_SetArgv(argc + 1, (char **)command_line);
 477
 478         fp = fopen(script, "r");
 479         if (!fp) {
 480                 sprintf(buf, "Can't open python script \"%s\"", script);
 481                 perror(buf);
 482                 err = -1;
 483                 goto error;
 484         }
 485
 486         err = PyRun_SimpleFile(fp, script);
 487         if (err) {
 488                 fprintf(stderr, "Error running python script %s\n", script);
 489                 goto error;
 490         }
 491
 492         err = run_start_sub();
 493         if (err) {
 494                 fprintf(stderr, "Error starting python script %s\n", script);
 495                 goto error;
 496         }
 497
 498         free(command_line);
 499
 500         return err;
 501 error:
 502         Py_Finalize();
 503         free(command_line);
 504
 505         return err;
 506 }
 507
 508 /*
 509  * Stop trace script
 510  */
 511 static int python_stop_script(void)
 512 {
 513         PyObject *handler, *retval;
 514         int err = 0;
 515
 516         handler = PyDict_GetItemString(main_dict, "trace_end");
 517         if (handler == NULL || !PyCallable_Check(handler))
 518                 goto out;
 519
 520         retval = PyObject_CallObject(handler, NULL);
 521         if (retval == NULL)
 522                 handler_call_die("trace_end");
 523         else
 524                 Py_DECREF(retval);
 525 out:
 526         Py_XDECREF(main_dict);
 527         Py_XDECREF(main_module);
 528         Py_Finalize();
 529
 530         return err;
 531 }
 532
 533 static int python_generate_script(struct pevent *pevent, const char *outfile)
 534 {
 535         struct event_format *event = NULL;
 536         struct format_field *f;
 537         char fname[PATH_MAX];
 538         int not_first, count;
 539         FILE *ofp;
 540
 541         sprintf(fname, "%s.py", outfile);
 542         ofp = fopen(fname, "w");
 543         if (ofp == NULL) {
 544                 fprintf(stderr, "couldn't open %s\n", fname);
 545                 return -1;
 546         }
 547         fprintf(ofp, "# perf script event handlers, "
 548                 "generated by perf script -g python\n");
 549
 550         fprintf(ofp, "# Licensed under the terms of the GNU GPL"
 551                 " License version 2\n\n");
 552
 553         fprintf(ofp, "# The common_* event handler fields are the most useful "
 554                 "fields common to\n");
 555
 556         fprintf(ofp, "# all events.  They don't necessarily correspond to "
 557                 "the 'common_*' fields\n");
 558
 559         fprintf(ofp, "# in the format files.  Those fields not available as "
 560                 "handler params can\n");
 561
 562         fprintf(ofp, "# be retrieved using Python functions of the form "
 563                 "common_*(context).\n");
 564
 565         fprintf(ofp, "# See the perf-trace-python Documentation for the list "
 566                 "of available functions.\n\n");
 567
 568         fprintf(ofp, "import os\n");
 569         fprintf(ofp, "import sys\n\n");
 570
 571         fprintf(ofp, "sys.path.append(os.environ['PERF_EXEC_PATH'] + \\\n");
 572         fprintf(ofp, "\t'/scripts/python/Perf-Trace-Util/lib/Perf/Trace')\n");
 573         fprintf(ofp, "\nfrom perf_trace_context import *\n");
 574         fprintf(ofp, "from Core import *\n\n\n");
 575
 576         fprintf(ofp, "def trace_begin():\n");
 577         fprintf(ofp, "\tprint \"in trace_begin\"\n\n");
 578
 579         fprintf(ofp, "def trace_end():\n");
 580         fprintf(ofp, "\tprint \"in trace_end\"\n\n");
 581
 582         while ((event = trace_find_next_event(pevent, event))) {
 583                 fprintf(ofp, "def %s__%s(", event->system, event->name);
 584                 fprintf(ofp, "event_name, ");
 585                 fprintf(ofp, "context, ");
 586                 fprintf(ofp, "common_cpu,\n");
 587                 fprintf(ofp, "\tcommon_secs, ");
 588                 fprintf(ofp, "common_nsecs, ");
 589                 fprintf(ofp, "common_pid, ");
 590                 fprintf(ofp, "common_comm,\n\t");
 591
 592                 not_first = 0;
 593                 count = 0;
 594
 595                 for (f = event->format.fields; f; f = f->next) {
 596                         if (not_first++)
 597                                 fprintf(ofp, ", ");
 598                         if (++count % 5 == 0)
 599                                 fprintf(ofp, "\n\t");
 600
 601                         fprintf(ofp, "%s", f->name);
 602                 }
 603                 fprintf(ofp, "):\n");
 604
 605                 fprintf(ofp, "\t\tprint_header(event_name, common_cpu, "
 606                         "common_secs, common_nsecs,\n\t\t\t"
 607                         "common_pid, common_comm)\n\n");
 608
 609                 fprintf(ofp, "\t\tprint \"");
 610
 611                 not_first = 0;
 612                 count = 0;
 613
 614                 for (f = event->format.fields; f; f = f->next) {
 615                         if (not_first++)
 616                                 fprintf(ofp, ", ");
 617                         if (count && count % 3 == 0) {
 618                                 fprintf(ofp, "\" \\\n\t\t\"");
 619                         }
 620                         count++;
 621
 622                         fprintf(ofp, "%s=", f->name);
 623                         if (f->flags & FIELD_IS_STRING ||
 624                             f->flags & FIELD_IS_FLAG ||
 625                             f->flags & FIELD_IS_SYMBOLIC)
 626                                 fprintf(ofp, "%%s");
 627                         else if (f->flags & FIELD_IS_SIGNED)
 628                                 fprintf(ofp, "%%d");
 629                         else
 630                                 fprintf(ofp, "%%u");
 631                 }
 632
 633                 fprintf(ofp, "\\n\" %% \\\n\t\t(");
 634
 635                 not_first = 0;
 636                 count = 0;
 637
 638                 for (f = event->format.fields; f; f = f->next) {
 639                         if (not_first++)
 640                                 fprintf(ofp, ", ");
 641
 642                         if (++count % 5 == 0)
 643                                 fprintf(ofp, "\n\t\t");
 644
 645                         if (f->flags & FIELD_IS_FLAG) {
 646                                 if ((count - 1) % 5 != 0) {
 647                                         fprintf(ofp, "\n\t\t");
 648                                         count = 4;
 649                                 }
 650                                 fprintf(ofp, "flag_str(\"");
 651                                 fprintf(ofp, "%s__%s\", ", event->system,
 652                                         event->name);
 653                                 fprintf(ofp, "\"%s\", %s)", f->name,
 654                                         f->name);
 655                         } else if (f->flags & FIELD_IS_SYMBOLIC) {
 656                                 if ((count - 1) % 5 != 0) {
 657                                         fprintf(ofp, "\n\t\t");
 658                                         count = 4;
 659                                 }
 660                                 fprintf(ofp, "symbol_str(\"");
 661                                 fprintf(ofp, "%s__%s\", ", event->system,
 662                                         event->name);
 663                                 fprintf(ofp, "\"%s\", %s)", f->name,
 664                                         f->name);
 665                         } else
 666                                 fprintf(ofp, "%s", f->name);
 667                 }
 668
 669                 fprintf(ofp, "),\n\n");
 670         }
 671
 672         fprintf(ofp, "def trace_unhandled(event_name, context, "
 673                 "event_fields_dict):\n");
 674
 675         fprintf(ofp, "\t\tprint ' '.join(['%%s=%%s'%%(k,str(v))"
 676                 "for k,v in sorted(event_fields_dict.items())])\n\n");
 677
 678         fprintf(ofp, "def print_header("
 679                 "event_name, cpu, secs, nsecs, pid, comm):\n"
 680                 "\tprint \"%%-20s %%5u %%05u.%%09u %%8u %%-20s \" %% \\\n\t"
 681                 "(event_name, cpu, secs, nsecs, pid, comm),\n");
 682
 683         fclose(ofp);
 684
 685         fprintf(stderr, "generated Python script: %s\n", fname);
 686
 687         return 0;
 688 }
 689
 690 struct scripting_ops python_scripting_ops = {
 691         .name = "Python",
 692         .start_script = python_start_script,
 693         .stop_script = python_stop_script,
 694         .process_event = python_process_event,
 695         .generate_script = python_generate_script,
 696 };