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
40 static int input_fd;
41
42 static ssize_t trace_data_size;
43 static bool repipe;
44
__do_read(int fd,void * buf,int size)45 static 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
do_read(void * data,int size)71 static 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 */
skip(int size)88 static 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
read4(struct pevent * pevent)100 static 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
read8(struct pevent * pevent)109 static 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
read_string(void)118 static 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);
158 out:
159 return str;
160 }
161
read_proc_kallsyms(struct pevent * pevent)162 static int read_proc_kallsyms(struct pevent *pevent)
163 {
164 unsigned int size;
165 char *buf;
166
167 size = read4(pevent);
168 if (!size)
169 return 0;
170
171 buf = malloc(size + 1);
172 if (buf == NULL)
173 return -1;
174
175 if (do_read(buf, size) < 0) {
176 free(buf);
177 return -1;
178 }
179 buf[size] = '\0';
180
181 parse_proc_kallsyms(pevent, buf, size);
182
183 free(buf);
184 return 0;
185 }
186
read_ftrace_printk(struct pevent * pevent)187 static int read_ftrace_printk(struct pevent *pevent)
188 {
189 unsigned int size;
190 char *buf;
191
192 /* it can have 0 size */
193 size = read4(pevent);
194 if (!size)
195 return 0;
196
197 buf = malloc(size);
198 if (buf == NULL)
199 return -1;
200
201 if (do_read(buf, size) < 0) {
202 free(buf);
203 return -1;
204 }
205
206 parse_ftrace_printk(pevent, buf, size);
207
208 free(buf);
209 return 0;
210 }
211
read_header_files(struct pevent * pevent)212 static int read_header_files(struct pevent *pevent)
213 {
214 unsigned long long size;
215 char *header_page;
216 char buf[BUFSIZ];
217 int ret = 0;
218
219 if (do_read(buf, 12) < 0)
220 return -1;
221
222 if (memcmp(buf, "header_page", 12) != 0) {
223 pr_debug("did not read header page");
224 return -1;
225 }
226
227 size = read8(pevent);
228
229 header_page = malloc(size);
230 if (header_page == NULL)
231 return -1;
232
233 if (do_read(header_page, size) < 0) {
234 pr_debug("did not read header page");
235 free(header_page);
236 return -1;
237 }
238
239 if (!pevent_parse_header_page(pevent, header_page, size,
240 pevent_get_long_size(pevent))) {
241 /*
242 * The commit field in the page is of type long,
243 * use that instead, since it represents the kernel.
244 */
245 pevent_set_long_size(pevent, pevent->header_page_size_size);
246 }
247 free(header_page);
248
249 if (do_read(buf, 13) < 0)
250 return -1;
251
252 if (memcmp(buf, "header_event", 13) != 0) {
253 pr_debug("did not read header event");
254 return -1;
255 }
256
257 size = read8(pevent);
258 skip(size);
259
260 return ret;
261 }
262
read_ftrace_file(struct pevent * pevent,unsigned long long size)263 static int read_ftrace_file(struct pevent *pevent, unsigned long long size)
264 {
265 char *buf;
266
267 buf = malloc(size);
268 if (buf == NULL)
269 return -1;
270
271 if (do_read(buf, size) < 0) {
272 free(buf);
273 return -1;
274 }
275
276 parse_ftrace_file(pevent, buf, size);
277 free(buf);
278 return 0;
279 }
280
read_event_file(struct pevent * pevent,char * sys,unsigned long long size)281 static int read_event_file(struct pevent *pevent, char *sys,
282 unsigned long long size)
283 {
284 char *buf;
285
286 buf = malloc(size);
287 if (buf == NULL)
288 return -1;
289
290 if (do_read(buf, size) < 0) {
291 free(buf);
292 return -1;
293 }
294
295 parse_event_file(pevent, buf, size, sys);
296 free(buf);
297 return 0;
298 }
299
read_ftrace_files(struct pevent * pevent)300 static int read_ftrace_files(struct pevent *pevent)
301 {
302 unsigned long long size;
303 int count;
304 int i;
305 int ret;
306
307 count = read4(pevent);
308
309 for (i = 0; i < count; i++) {
310 size = read8(pevent);
311 ret = read_ftrace_file(pevent, size);
312 if (ret)
313 return ret;
314 }
315 return 0;
316 }
317
read_event_files(struct pevent * pevent)318 static int read_event_files(struct pevent *pevent)
319 {
320 unsigned long long size;
321 char *sys;
322 int systems;
323 int count;
324 int i,x;
325 int ret;
326
327 systems = read4(pevent);
328
329 for (i = 0; i < systems; i++) {
330 sys = read_string();
331 if (sys == NULL)
332 return -1;
333
334 count = read4(pevent);
335
336 for (x=0; x < count; x++) {
337 size = read8(pevent);
338 ret = read_event_file(pevent, sys, size);
339 if (ret)
340 return ret;
341 }
342 }
343 return 0;
344 }
345
trace_report(int fd,struct trace_event * tevent,bool __repipe)346 ssize_t trace_report(int fd, struct trace_event *tevent, bool __repipe)
347 {
348 char buf[BUFSIZ];
349 char test[] = { 23, 8, 68 };
350 char *version;
351 int show_version = 0;
352 int show_funcs = 0;
353 int show_printk = 0;
354 ssize_t size = -1;
355 int file_bigendian;
356 int host_bigendian;
357 int file_long_size;
358 int file_page_size;
359 struct pevent *pevent = NULL;
360 int err;
361
362 repipe = __repipe;
363 input_fd = fd;
364
365 if (do_read(buf, 3) < 0)
366 return -1;
367 if (memcmp(buf, test, 3) != 0) {
368 pr_debug("no trace data in the file");
369 return -1;
370 }
371
372 if (do_read(buf, 7) < 0)
373 return -1;
374 if (memcmp(buf, "tracing", 7) != 0) {
375 pr_debug("not a trace file (missing 'tracing' tag)");
376 return -1;
377 }
378
379 version = read_string();
380 if (version == NULL)
381 return -1;
382 if (show_version)
383 printf("version = %s\n", version);
384 free(version);
385
386 if (do_read(buf, 1) < 0)
387 return -1;
388 file_bigendian = buf[0];
389 host_bigendian = bigendian();
390
391 if (trace_event__init(tevent)) {
392 pr_debug("trace_event__init failed");
393 goto out;
394 }
395
396 pevent = tevent->pevent;
397
398 pevent_set_flag(pevent, PEVENT_NSEC_OUTPUT);
399 pevent_set_file_bigendian(pevent, file_bigendian);
400 pevent_set_host_bigendian(pevent, host_bigendian);
401
402 if (do_read(buf, 1) < 0)
403 goto out;
404 file_long_size = buf[0];
405
406 file_page_size = read4(pevent);
407 if (!file_page_size)
408 goto out;
409
410 pevent_set_long_size(pevent, file_long_size);
411 pevent_set_page_size(pevent, file_page_size);
412
413 err = read_header_files(pevent);
414 if (err)
415 goto out;
416 err = read_ftrace_files(pevent);
417 if (err)
418 goto out;
419 err = read_event_files(pevent);
420 if (err)
421 goto out;
422 err = read_proc_kallsyms(pevent);
423 if (err)
424 goto out;
425 err = read_ftrace_printk(pevent);
426 if (err)
427 goto out;
428
429 size = trace_data_size;
430 repipe = false;
431
432 if (show_funcs) {
433 pevent_print_funcs(pevent);
434 } else if (show_printk) {
435 pevent_print_printk(pevent);
436 }
437
438 pevent = NULL;
439
440 out:
441 if (pevent)
442 trace_event__cleanup(tevent);
443 return size;
444 }
445