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1/*
2 * Copyright (C) 2009, Steven Rostedt <srostedt@redhat.com>
3 *
4 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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; version 2 of the License (not later!)
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 *
19 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
20 */
21#include <dirent.h>
22#include <stdio.h>
23#include <stdlib.h>
24#include <string.h>
25#include <stdarg.h>
26#include <sys/types.h>
27#include <sys/stat.h>
28#include <sys/wait.h>
29#include <sys/mman.h>
30#include <fcntl.h>
31#include <unistd.h>
32#include <errno.h>
33
34#include "../perf.h"
35#include "util.h"
36#include "trace-event.h"
37#include "debug.h"
38
39static int input_fd;
40
41static ssize_t trace_data_size;
42static bool repipe;
43
44static int __do_read(int fd, void *buf, int size)
45{
46 int rsize = size;
47
48 while (size) {
49 int ret = read(fd, buf, size);
50
51 if (ret <= 0)
52 return -1;
53
54 if (repipe) {
55 int retw = write(STDOUT_FILENO, buf, ret);
56
57 if (retw <= 0 || retw != ret) {
58 pr_debug("repiping input file");
59 return -1;
60 }
61 }
62
63 size -= ret;
64 buf += ret;
65 }
66
67 return rsize;
68}
69
70static int do_read(void *data, int size)
71{
72 int r;
73
74 r = __do_read(input_fd, data, size);
75 if (r <= 0) {
76 pr_debug("reading input file (size expected=%d received=%d)",
77 size, r);
78 return -1;
79 }
80
81 trace_data_size += r;
82
83 return r;
84}
85
86/* If it fails, the next read will report it */
87static void skip(int size)
88{
89 char buf[BUFSIZ];
90 int r;
91
92 while (size) {
93 r = size > BUFSIZ ? BUFSIZ : size;
94 do_read(buf, r);
95 size -= r;
96 };
97}
98
99static unsigned int read4(struct pevent *pevent)
100{
101 unsigned int data;
102
103 if (do_read(&data, 4) < 0)
104 return 0;
105 return __data2host4(pevent, data);
106}
107
108static unsigned long long read8(struct pevent *pevent)
109{
110 unsigned long long data;
111
112 if (do_read(&data, 8) < 0)
113 return 0;
114 return __data2host8(pevent, data);
115}
116
117static char *read_string(void)
118{
119 char buf[BUFSIZ];
120 char *str = NULL;
121 int size = 0;
122 off_t r;
123 char c;
124
125 for (;;) {
126 r = read(input_fd, &c, 1);
127 if (r < 0) {
128 pr_debug("reading input file");
129 goto out;
130 }
131
132 if (!r) {
133 pr_debug("no data");
134 goto out;
135 }
136
137 if (repipe) {
138 int retw = write(STDOUT_FILENO, &c, 1);
139
140 if (retw <= 0 || retw != r) {
141 pr_debug("repiping input file string");
142 goto out;
143 }
144 }
145
146 buf[size++] = c;
147
148 if (!c)
149 break;
150 }
151
152 trace_data_size += size;
153
154 str = malloc(size);
155 if (str)
156 memcpy(str, buf, size);
157out:
158 return str;
159}
160
161static int read_proc_kallsyms(struct pevent *pevent)
162{
163 unsigned int size;
164
165 size = read4(pevent);
166 if (!size)
167 return 0;
168 /*
169 * Just skip it, now that we configure libtraceevent to use the
170 * tools/perf/ symbol resolver.
171 *
172 * We need to skip it so that we can continue parsing old perf.data
173 * files, that contains this /proc/kallsyms payload.
174 *
175 * Newer perf.data files will have just the 4-bytes zeros "kallsyms
176 * payload", so that older tools can continue reading it and interpret
177 * it as "no kallsyms payload is present".
178 */
179 lseek(input_fd, size, SEEK_CUR);
180 trace_data_size += size;
181 return 0;
182}
183
184static int read_ftrace_printk(struct pevent *pevent)
185{
186 unsigned int size;
187 char *buf;
188
189 /* it can have 0 size */
190 size = read4(pevent);
191 if (!size)
192 return 0;
193
194 buf = malloc(size + 1);
195 if (buf == NULL)
196 return -1;
197
198 if (do_read(buf, size) < 0) {
199 free(buf);
200 return -1;
201 }
202
203 buf[size] = '\0';
204
205 parse_ftrace_printk(pevent, buf, size);
206
207 free(buf);
208 return 0;
209}
210
211static int read_header_files(struct pevent *pevent)
212{
213 unsigned long long size;
214 char *header_page;
215 char buf[BUFSIZ];
216 int ret = 0;
217
218 if (do_read(buf, 12) < 0)
219 return -1;
220
221 if (memcmp(buf, "header_page", 12) != 0) {
222 pr_debug("did not read header page");
223 return -1;
224 }
225
226 size = read8(pevent);
227
228 header_page = malloc(size);
229 if (header_page == NULL)
230 return -1;
231
232 if (do_read(header_page, size) < 0) {
233 pr_debug("did not read header page");
234 free(header_page);
235 return -1;
236 }
237
238 if (!pevent_parse_header_page(pevent, header_page, size,
239 pevent_get_long_size(pevent))) {
240 /*
241 * The commit field in the page is of type long,
242 * use that instead, since it represents the kernel.
243 */
244 pevent_set_long_size(pevent, pevent->header_page_size_size);
245 }
246 free(header_page);
247
248 if (do_read(buf, 13) < 0)
249 return -1;
250
251 if (memcmp(buf, "header_event", 13) != 0) {
252 pr_debug("did not read header event");
253 return -1;
254 }
255
256 size = read8(pevent);
257 skip(size);
258
259 return ret;
260}
261
262static int read_ftrace_file(struct pevent *pevent, unsigned long long size)
263{
264 int ret;
265 char *buf;
266
267 buf = malloc(size);
268 if (buf == NULL) {
269 pr_debug("memory allocation failure\n");
270 return -1;
271 }
272
273 ret = do_read(buf, size);
274 if (ret < 0) {
275 pr_debug("error reading ftrace file.\n");
276 goto out;
277 }
278
279 ret = parse_ftrace_file(pevent, buf, size);
280 if (ret < 0)
281 pr_debug("error parsing ftrace file.\n");
282out:
283 free(buf);
284 return ret;
285}
286
287static int read_event_file(struct pevent *pevent, char *sys,
288 unsigned long long size)
289{
290 int ret;
291 char *buf;
292
293 buf = malloc(size);
294 if (buf == NULL) {
295 pr_debug("memory allocation failure\n");
296 return -1;
297 }
298
299 ret = do_read(buf, size);
300 if (ret < 0) {
301 free(buf);
302 goto out;
303 }
304
305 ret = parse_event_file(pevent, buf, size, sys);
306 if (ret < 0)
307 pr_debug("error parsing event file.\n");
308out:
309 free(buf);
310 return ret;
311}
312
313static int read_ftrace_files(struct pevent *pevent)
314{
315 unsigned long long size;
316 int count;
317 int i;
318 int ret;
319
320 count = read4(pevent);
321
322 for (i = 0; i < count; i++) {
323 size = read8(pevent);
324 ret = read_ftrace_file(pevent, size);
325 if (ret)
326 return ret;
327 }
328 return 0;
329}
330
331static int read_event_files(struct pevent *pevent)
332{
333 unsigned long long size;
334 char *sys;
335 int systems;
336 int count;
337 int i,x;
338 int ret;
339
340 systems = read4(pevent);
341
342 for (i = 0; i < systems; i++) {
343 sys = read_string();
344 if (sys == NULL)
345 return -1;
346
347 count = read4(pevent);
348
349 for (x=0; x < count; x++) {
350 size = read8(pevent);
351 ret = read_event_file(pevent, sys, size);
352 if (ret)
353 return ret;
354 }
355 }
356 return 0;
357}
358
359static int read_saved_cmdline(struct pevent *pevent)
360{
361 unsigned long long size;
362 char *buf;
363 int ret;
364
365 /* it can have 0 size */
366 size = read8(pevent);
367 if (!size)
368 return 0;
369
370 buf = malloc(size + 1);
371 if (buf == NULL) {
372 pr_debug("memory allocation failure\n");
373 return -1;
374 }
375
376 ret = do_read(buf, size);
377 if (ret < 0) {
378 pr_debug("error reading saved cmdlines\n");
379 goto out;
380 }
381
382 parse_saved_cmdline(pevent, buf, size);
383 ret = 0;
384out:
385 free(buf);
386 return ret;
387}
388
389ssize_t trace_report(int fd, struct trace_event *tevent, bool __repipe)
390{
391 char buf[BUFSIZ];
392 char test[] = { 23, 8, 68 };
393 char *version;
394 int show_version = 0;
395 int show_funcs = 0;
396 int show_printk = 0;
397 ssize_t size = -1;
398 int file_bigendian;
399 int host_bigendian;
400 int file_long_size;
401 int file_page_size;
402 struct pevent *pevent = NULL;
403 int err;
404
405 repipe = __repipe;
406 input_fd = fd;
407
408 if (do_read(buf, 3) < 0)
409 return -1;
410 if (memcmp(buf, test, 3) != 0) {
411 pr_debug("no trace data in the file");
412 return -1;
413 }
414
415 if (do_read(buf, 7) < 0)
416 return -1;
417 if (memcmp(buf, "tracing", 7) != 0) {
418 pr_debug("not a trace file (missing 'tracing' tag)");
419 return -1;
420 }
421
422 version = read_string();
423 if (version == NULL)
424 return -1;
425 if (show_version)
426 printf("version = %s\n", version);
427
428 if (do_read(buf, 1) < 0) {
429 free(version);
430 return -1;
431 }
432 file_bigendian = buf[0];
433 host_bigendian = bigendian();
434
435 if (trace_event__init(tevent)) {
436 pr_debug("trace_event__init failed");
437 goto out;
438 }
439
440 pevent = tevent->pevent;
441
442 pevent_set_flag(pevent, PEVENT_NSEC_OUTPUT);
443 pevent_set_file_bigendian(pevent, file_bigendian);
444 pevent_set_host_bigendian(pevent, host_bigendian);
445
446 if (do_read(buf, 1) < 0)
447 goto out;
448 file_long_size = buf[0];
449
450 file_page_size = read4(pevent);
451 if (!file_page_size)
452 goto out;
453
454 pevent_set_long_size(pevent, file_long_size);
455 pevent_set_page_size(pevent, file_page_size);
456
457 err = read_header_files(pevent);
458 if (err)
459 goto out;
460 err = read_ftrace_files(pevent);
461 if (err)
462 goto out;
463 err = read_event_files(pevent);
464 if (err)
465 goto out;
466 err = read_proc_kallsyms(pevent);
467 if (err)
468 goto out;
469 err = read_ftrace_printk(pevent);
470 if (err)
471 goto out;
472 if (atof(version) >= 0.6) {
473 err = read_saved_cmdline(pevent);
474 if (err)
475 goto out;
476 }
477
478 size = trace_data_size;
479 repipe = false;
480
481 if (show_funcs) {
482 pevent_print_funcs(pevent);
483 } else if (show_printk) {
484 pevent_print_printk(pevent);
485 }
486
487 pevent = NULL;
488
489out:
490 if (pevent)
491 trace_event__cleanup(tevent);
492 free(version);
493 return size;
494}
1/*
2 * Copyright (C) 2009, Steven Rostedt <srostedt@redhat.com>
3 *
4 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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; version 2 of the License (not later!)
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 *
19 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
20 */
21#include <dirent.h>
22#include <stdio.h>
23#include <stdlib.h>
24#include <string.h>
25#include <stdarg.h>
26#include <sys/types.h>
27#include <sys/stat.h>
28#include <sys/wait.h>
29#include <sys/mman.h>
30#include <pthread.h>
31#include <fcntl.h>
32#include <unistd.h>
33#include <errno.h>
34
35#include "../perf.h"
36#include "util.h"
37#include "trace-event.h"
38#include "debug.h"
39
40static int input_fd;
41
42static ssize_t trace_data_size;
43static bool repipe;
44
45static int __do_read(int fd, void *buf, int size)
46{
47 int rsize = size;
48
49 while (size) {
50 int ret = read(fd, buf, size);
51
52 if (ret <= 0)
53 return -1;
54
55 if (repipe) {
56 int retw = write(STDOUT_FILENO, buf, ret);
57
58 if (retw <= 0 || retw != ret) {
59 pr_debug("repiping input file");
60 return -1;
61 }
62 }
63
64 size -= ret;
65 buf += ret;
66 }
67
68 return rsize;
69}
70
71static int do_read(void *data, int size)
72{
73 int r;
74
75 r = __do_read(input_fd, data, size);
76 if (r <= 0) {
77 pr_debug("reading input file (size expected=%d received=%d)",
78 size, r);
79 return -1;
80 }
81
82 trace_data_size += r;
83
84 return r;
85}
86
87/* If it fails, the next read will report it */
88static void skip(int size)
89{
90 char buf[BUFSIZ];
91 int r;
92
93 while (size) {
94 r = size > BUFSIZ ? BUFSIZ : size;
95 do_read(buf, r);
96 size -= r;
97 };
98}
99
100static unsigned int read4(struct pevent *pevent)
101{
102 unsigned int data;
103
104 if (do_read(&data, 4) < 0)
105 return 0;
106 return __data2host4(pevent, data);
107}
108
109static unsigned long long read8(struct pevent *pevent)
110{
111 unsigned long long data;
112
113 if (do_read(&data, 8) < 0)
114 return 0;
115 return __data2host8(pevent, data);
116}
117
118static char *read_string(void)
119{
120 char buf[BUFSIZ];
121 char *str = NULL;
122 int size = 0;
123 off_t r;
124 char c;
125
126 for (;;) {
127 r = read(input_fd, &c, 1);
128 if (r < 0) {
129 pr_debug("reading input file");
130 goto out;
131 }
132
133 if (!r) {
134 pr_debug("no data");
135 goto out;
136 }
137
138 if (repipe) {
139 int retw = write(STDOUT_FILENO, &c, 1);
140
141 if (retw <= 0 || retw != r) {
142 pr_debug("repiping input file string");
143 goto out;
144 }
145 }
146
147 buf[size++] = c;
148
149 if (!c)
150 break;
151 }
152
153 trace_data_size += size;
154
155 str = malloc(size);
156 if (str)
157 memcpy(str, buf, size);
158out:
159 return str;
160}
161
162static int read_proc_kallsyms(struct pevent *pevent)
163{
164 unsigned int size;
165
166 size = read4(pevent);
167 if (!size)
168 return 0;
169 /*
170 * Just skip it, now that we configure libtraceevent to use the
171 * tools/perf/ symbol resolver.
172 *
173 * We need to skip it so that we can continue parsing old perf.data
174 * files, that contains this /proc/kallsyms payload.
175 *
176 * Newer perf.data files will have just the 4-bytes zeros "kallsyms
177 * payload", so that older tools can continue reading it and interpret
178 * it as "no kallsyms payload is present".
179 */
180 lseek(input_fd, size, SEEK_CUR);
181 trace_data_size += size;
182 return 0;
183}
184
185static int read_ftrace_printk(struct pevent *pevent)
186{
187 unsigned int size;
188 char *buf;
189
190 /* it can have 0 size */
191 size = read4(pevent);
192 if (!size)
193 return 0;
194
195 buf = malloc(size);
196 if (buf == NULL)
197 return -1;
198
199 if (do_read(buf, size) < 0) {
200 free(buf);
201 return -1;
202 }
203
204 parse_ftrace_printk(pevent, buf, size);
205
206 free(buf);
207 return 0;
208}
209
210static int read_header_files(struct pevent *pevent)
211{
212 unsigned long long size;
213 char *header_page;
214 char buf[BUFSIZ];
215 int ret = 0;
216
217 if (do_read(buf, 12) < 0)
218 return -1;
219
220 if (memcmp(buf, "header_page", 12) != 0) {
221 pr_debug("did not read header page");
222 return -1;
223 }
224
225 size = read8(pevent);
226
227 header_page = malloc(size);
228 if (header_page == NULL)
229 return -1;
230
231 if (do_read(header_page, size) < 0) {
232 pr_debug("did not read header page");
233 free(header_page);
234 return -1;
235 }
236
237 if (!pevent_parse_header_page(pevent, header_page, size,
238 pevent_get_long_size(pevent))) {
239 /*
240 * The commit field in the page is of type long,
241 * use that instead, since it represents the kernel.
242 */
243 pevent_set_long_size(pevent, pevent->header_page_size_size);
244 }
245 free(header_page);
246
247 if (do_read(buf, 13) < 0)
248 return -1;
249
250 if (memcmp(buf, "header_event", 13) != 0) {
251 pr_debug("did not read header event");
252 return -1;
253 }
254
255 size = read8(pevent);
256 skip(size);
257
258 return ret;
259}
260
261static int read_ftrace_file(struct pevent *pevent, unsigned long long size)
262{
263 char *buf;
264
265 buf = malloc(size);
266 if (buf == NULL)
267 return -1;
268
269 if (do_read(buf, size) < 0) {
270 free(buf);
271 return -1;
272 }
273
274 parse_ftrace_file(pevent, buf, size);
275 free(buf);
276 return 0;
277}
278
279static int read_event_file(struct pevent *pevent, char *sys,
280 unsigned long long size)
281{
282 char *buf;
283
284 buf = malloc(size);
285 if (buf == NULL)
286 return -1;
287
288 if (do_read(buf, size) < 0) {
289 free(buf);
290 return -1;
291 }
292
293 parse_event_file(pevent, buf, size, sys);
294 free(buf);
295 return 0;
296}
297
298static int read_ftrace_files(struct pevent *pevent)
299{
300 unsigned long long size;
301 int count;
302 int i;
303 int ret;
304
305 count = read4(pevent);
306
307 for (i = 0; i < count; i++) {
308 size = read8(pevent);
309 ret = read_ftrace_file(pevent, size);
310 if (ret)
311 return ret;
312 }
313 return 0;
314}
315
316static int read_event_files(struct pevent *pevent)
317{
318 unsigned long long size;
319 char *sys;
320 int systems;
321 int count;
322 int i,x;
323 int ret;
324
325 systems = read4(pevent);
326
327 for (i = 0; i < systems; i++) {
328 sys = read_string();
329 if (sys == NULL)
330 return -1;
331
332 count = read4(pevent);
333
334 for (x=0; x < count; x++) {
335 size = read8(pevent);
336 ret = read_event_file(pevent, sys, size);
337 if (ret)
338 return ret;
339 }
340 }
341 return 0;
342}
343
344ssize_t trace_report(int fd, struct trace_event *tevent, bool __repipe)
345{
346 char buf[BUFSIZ];
347 char test[] = { 23, 8, 68 };
348 char *version;
349 int show_version = 0;
350 int show_funcs = 0;
351 int show_printk = 0;
352 ssize_t size = -1;
353 int file_bigendian;
354 int host_bigendian;
355 int file_long_size;
356 int file_page_size;
357 struct pevent *pevent = NULL;
358 int err;
359
360 repipe = __repipe;
361 input_fd = fd;
362
363 if (do_read(buf, 3) < 0)
364 return -1;
365 if (memcmp(buf, test, 3) != 0) {
366 pr_debug("no trace data in the file");
367 return -1;
368 }
369
370 if (do_read(buf, 7) < 0)
371 return -1;
372 if (memcmp(buf, "tracing", 7) != 0) {
373 pr_debug("not a trace file (missing 'tracing' tag)");
374 return -1;
375 }
376
377 version = read_string();
378 if (version == NULL)
379 return -1;
380 if (show_version)
381 printf("version = %s\n", version);
382 free(version);
383
384 if (do_read(buf, 1) < 0)
385 return -1;
386 file_bigendian = buf[0];
387 host_bigendian = bigendian();
388
389 if (trace_event__init(tevent)) {
390 pr_debug("trace_event__init failed");
391 goto out;
392 }
393
394 pevent = tevent->pevent;
395
396 pevent_set_flag(pevent, PEVENT_NSEC_OUTPUT);
397 pevent_set_file_bigendian(pevent, file_bigendian);
398 pevent_set_host_bigendian(pevent, host_bigendian);
399
400 if (do_read(buf, 1) < 0)
401 goto out;
402 file_long_size = buf[0];
403
404 file_page_size = read4(pevent);
405 if (!file_page_size)
406 goto out;
407
408 pevent_set_long_size(pevent, file_long_size);
409 pevent_set_page_size(pevent, file_page_size);
410
411 err = read_header_files(pevent);
412 if (err)
413 goto out;
414 err = read_ftrace_files(pevent);
415 if (err)
416 goto out;
417 err = read_event_files(pevent);
418 if (err)
419 goto out;
420 err = read_proc_kallsyms(pevent);
421 if (err)
422 goto out;
423 err = read_ftrace_printk(pevent);
424 if (err)
425 goto out;
426
427 size = trace_data_size;
428 repipe = false;
429
430 if (show_funcs) {
431 pevent_print_funcs(pevent);
432 } else if (show_printk) {
433 pevent_print_printk(pevent);
434 }
435
436 pevent = NULL;
437
438out:
439 if (pevent)
440 trace_event__cleanup(tevent);
441 return size;
442}