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