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1/*
2 * Copyright (C) 2008,2009, 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 "util.h"
22#include <dirent.h>
23#include <mntent.h>
24#include <stdio.h>
25#include <stdlib.h>
26#include <string.h>
27#include <stdarg.h>
28#include <sys/types.h>
29#include <sys/stat.h>
30#include <sys/wait.h>
31#include <pthread.h>
32#include <fcntl.h>
33#include <unistd.h>
34#include <errno.h>
35#include <stdbool.h>
36#include <linux/list.h>
37#include <linux/kernel.h>
38
39#include "../perf.h"
40#include "trace-event.h"
41#include <api/fs/tracing_path.h>
42#include "evsel.h"
43#include "debug.h"
44
45#define VERSION "0.5"
46
47static int output_fd;
48
49
50int bigendian(void)
51{
52 unsigned char str[] = { 0x1, 0x2, 0x3, 0x4, 0x0, 0x0, 0x0, 0x0};
53 unsigned int *ptr;
54
55 ptr = (unsigned int *)(void *)str;
56 return *ptr == 0x01020304;
57}
58
59/* unfortunately, you can not stat debugfs or proc files for size */
60static int record_file(const char *file, ssize_t hdr_sz)
61{
62 unsigned long long size = 0;
63 char buf[BUFSIZ], *sizep;
64 off_t hdr_pos = lseek(output_fd, 0, SEEK_CUR);
65 int r, fd;
66 int err = -EIO;
67
68 fd = open(file, O_RDONLY);
69 if (fd < 0) {
70 pr_debug("Can't read '%s'", file);
71 return -errno;
72 }
73
74 /* put in zeros for file size, then fill true size later */
75 if (hdr_sz) {
76 if (write(output_fd, &size, hdr_sz) != hdr_sz)
77 goto out;
78 }
79
80 do {
81 r = read(fd, buf, BUFSIZ);
82 if (r > 0) {
83 size += r;
84 if (write(output_fd, buf, r) != r)
85 goto out;
86 }
87 } while (r > 0);
88
89 /* ugh, handle big-endian hdr_size == 4 */
90 sizep = (char*)&size;
91 if (bigendian())
92 sizep += sizeof(u64) - hdr_sz;
93
94 if (hdr_sz && pwrite(output_fd, sizep, hdr_sz, hdr_pos) < 0) {
95 pr_debug("writing file size failed\n");
96 goto out;
97 }
98
99 err = 0;
100out:
101 close(fd);
102 return err;
103}
104
105static int record_header_files(void)
106{
107 char *path;
108 struct stat st;
109 int err = -EIO;
110
111 path = get_tracing_file("events/header_page");
112 if (!path) {
113 pr_debug("can't get tracing/events/header_page");
114 return -ENOMEM;
115 }
116
117 if (stat(path, &st) < 0) {
118 pr_debug("can't read '%s'", path);
119 goto out;
120 }
121
122 if (write(output_fd, "header_page", 12) != 12) {
123 pr_debug("can't write header_page\n");
124 goto out;
125 }
126
127 if (record_file(path, 8) < 0) {
128 pr_debug("can't record header_page file\n");
129 goto out;
130 }
131
132 put_tracing_file(path);
133
134 path = get_tracing_file("events/header_event");
135 if (!path) {
136 pr_debug("can't get tracing/events/header_event");
137 err = -ENOMEM;
138 goto out;
139 }
140
141 if (stat(path, &st) < 0) {
142 pr_debug("can't read '%s'", path);
143 goto out;
144 }
145
146 if (write(output_fd, "header_event", 13) != 13) {
147 pr_debug("can't write header_event\n");
148 goto out;
149 }
150
151 if (record_file(path, 8) < 0) {
152 pr_debug("can't record header_event file\n");
153 goto out;
154 }
155
156 err = 0;
157out:
158 put_tracing_file(path);
159 return err;
160}
161
162static bool name_in_tp_list(char *sys, struct tracepoint_path *tps)
163{
164 while (tps) {
165 if (!strcmp(sys, tps->name))
166 return true;
167 tps = tps->next;
168 }
169
170 return false;
171}
172
173static int copy_event_system(const char *sys, struct tracepoint_path *tps)
174{
175 struct dirent *dent;
176 struct stat st;
177 char *format;
178 DIR *dir;
179 int count = 0;
180 int ret;
181 int err;
182
183 dir = opendir(sys);
184 if (!dir) {
185 pr_debug("can't read directory '%s'", sys);
186 return -errno;
187 }
188
189 while ((dent = readdir(dir))) {
190 if (dent->d_type != DT_DIR ||
191 strcmp(dent->d_name, ".") == 0 ||
192 strcmp(dent->d_name, "..") == 0 ||
193 !name_in_tp_list(dent->d_name, tps))
194 continue;
195 if (asprintf(&format, "%s/%s/format", sys, dent->d_name) < 0) {
196 err = -ENOMEM;
197 goto out;
198 }
199 ret = stat(format, &st);
200 free(format);
201 if (ret < 0)
202 continue;
203 count++;
204 }
205
206 if (write(output_fd, &count, 4) != 4) {
207 err = -EIO;
208 pr_debug("can't write count\n");
209 goto out;
210 }
211
212 rewinddir(dir);
213 while ((dent = readdir(dir))) {
214 if (dent->d_type != DT_DIR ||
215 strcmp(dent->d_name, ".") == 0 ||
216 strcmp(dent->d_name, "..") == 0 ||
217 !name_in_tp_list(dent->d_name, tps))
218 continue;
219 if (asprintf(&format, "%s/%s/format", sys, dent->d_name) < 0) {
220 err = -ENOMEM;
221 goto out;
222 }
223 ret = stat(format, &st);
224
225 if (ret >= 0) {
226 err = record_file(format, 8);
227 if (err) {
228 free(format);
229 goto out;
230 }
231 }
232 free(format);
233 }
234 err = 0;
235out:
236 closedir(dir);
237 return err;
238}
239
240static int record_ftrace_files(struct tracepoint_path *tps)
241{
242 char *path;
243 int ret;
244
245 path = get_tracing_file("events/ftrace");
246 if (!path) {
247 pr_debug("can't get tracing/events/ftrace");
248 return -ENOMEM;
249 }
250
251 ret = copy_event_system(path, tps);
252
253 put_tracing_file(path);
254
255 return ret;
256}
257
258static bool system_in_tp_list(char *sys, struct tracepoint_path *tps)
259{
260 while (tps) {
261 if (!strcmp(sys, tps->system))
262 return true;
263 tps = tps->next;
264 }
265
266 return false;
267}
268
269static int record_event_files(struct tracepoint_path *tps)
270{
271 struct dirent *dent;
272 struct stat st;
273 char *path;
274 char *sys;
275 DIR *dir;
276 int count = 0;
277 int ret;
278 int err;
279
280 path = get_tracing_file("events");
281 if (!path) {
282 pr_debug("can't get tracing/events");
283 return -ENOMEM;
284 }
285
286 dir = opendir(path);
287 if (!dir) {
288 err = -errno;
289 pr_debug("can't read directory '%s'", path);
290 goto out;
291 }
292
293 while ((dent = readdir(dir))) {
294 if (dent->d_type != DT_DIR ||
295 strcmp(dent->d_name, ".") == 0 ||
296 strcmp(dent->d_name, "..") == 0 ||
297 strcmp(dent->d_name, "ftrace") == 0 ||
298 !system_in_tp_list(dent->d_name, tps))
299 continue;
300 count++;
301 }
302
303 if (write(output_fd, &count, 4) != 4) {
304 err = -EIO;
305 pr_debug("can't write count\n");
306 goto out;
307 }
308
309 rewinddir(dir);
310 while ((dent = readdir(dir))) {
311 if (dent->d_type != DT_DIR ||
312 strcmp(dent->d_name, ".") == 0 ||
313 strcmp(dent->d_name, "..") == 0 ||
314 strcmp(dent->d_name, "ftrace") == 0 ||
315 !system_in_tp_list(dent->d_name, tps))
316 continue;
317 if (asprintf(&sys, "%s/%s", path, dent->d_name) < 0) {
318 err = -ENOMEM;
319 goto out;
320 }
321 ret = stat(sys, &st);
322 if (ret >= 0) {
323 ssize_t size = strlen(dent->d_name) + 1;
324
325 if (write(output_fd, dent->d_name, size) != size ||
326 copy_event_system(sys, tps) < 0) {
327 err = -EIO;
328 free(sys);
329 goto out;
330 }
331 }
332 free(sys);
333 }
334 err = 0;
335out:
336 closedir(dir);
337 put_tracing_file(path);
338
339 return err;
340}
341
342static int record_proc_kallsyms(void)
343{
344 unsigned long long size = 0;
345 /*
346 * Just to keep older perf.data file parsers happy, record a zero
347 * sized kallsyms file, i.e. do the same thing that was done when
348 * /proc/kallsyms (or something specified via --kallsyms, in a
349 * different path) couldn't be read.
350 */
351 return write(output_fd, &size, 4) != 4 ? -EIO : 0;
352}
353
354static int record_ftrace_printk(void)
355{
356 unsigned int size;
357 char *path;
358 struct stat st;
359 int ret, err = 0;
360
361 path = get_tracing_file("printk_formats");
362 if (!path) {
363 pr_debug("can't get tracing/printk_formats");
364 return -ENOMEM;
365 }
366
367 ret = stat(path, &st);
368 if (ret < 0) {
369 /* not found */
370 size = 0;
371 if (write(output_fd, &size, 4) != 4)
372 err = -EIO;
373 goto out;
374 }
375 err = record_file(path, 4);
376
377out:
378 put_tracing_file(path);
379 return err;
380}
381
382static void
383put_tracepoints_path(struct tracepoint_path *tps)
384{
385 while (tps) {
386 struct tracepoint_path *t = tps;
387
388 tps = tps->next;
389 zfree(&t->name);
390 zfree(&t->system);
391 free(t);
392 }
393}
394
395static struct tracepoint_path *
396get_tracepoints_path(struct list_head *pattrs)
397{
398 struct tracepoint_path path, *ppath = &path;
399 struct perf_evsel *pos;
400 int nr_tracepoints = 0;
401
402 list_for_each_entry(pos, pattrs, node) {
403 if (pos->attr.type != PERF_TYPE_TRACEPOINT)
404 continue;
405 ++nr_tracepoints;
406
407 if (pos->name) {
408 ppath->next = tracepoint_name_to_path(pos->name);
409 if (ppath->next)
410 goto next;
411
412 if (strchr(pos->name, ':') == NULL)
413 goto try_id;
414
415 goto error;
416 }
417
418try_id:
419 ppath->next = tracepoint_id_to_path(pos->attr.config);
420 if (!ppath->next) {
421error:
422 pr_debug("No memory to alloc tracepoints list\n");
423 put_tracepoints_path(&path);
424 return NULL;
425 }
426next:
427 ppath = ppath->next;
428 }
429
430 return nr_tracepoints > 0 ? path.next : NULL;
431}
432
433bool have_tracepoints(struct list_head *pattrs)
434{
435 struct perf_evsel *pos;
436
437 list_for_each_entry(pos, pattrs, node)
438 if (pos->attr.type == PERF_TYPE_TRACEPOINT)
439 return true;
440
441 return false;
442}
443
444static int tracing_data_header(void)
445{
446 char buf[20];
447 ssize_t size;
448
449 /* just guessing this is someone's birthday.. ;) */
450 buf[0] = 23;
451 buf[1] = 8;
452 buf[2] = 68;
453 memcpy(buf + 3, "tracing", 7);
454
455 if (write(output_fd, buf, 10) != 10)
456 return -1;
457
458 size = strlen(VERSION) + 1;
459 if (write(output_fd, VERSION, size) != size)
460 return -1;
461
462 /* save endian */
463 if (bigendian())
464 buf[0] = 1;
465 else
466 buf[0] = 0;
467
468 if (write(output_fd, buf, 1) != 1)
469 return -1;
470
471 /* save size of long */
472 buf[0] = sizeof(long);
473 if (write(output_fd, buf, 1) != 1)
474 return -1;
475
476 /* save page_size */
477 if (write(output_fd, &page_size, 4) != 4)
478 return -1;
479
480 return 0;
481}
482
483struct tracing_data *tracing_data_get(struct list_head *pattrs,
484 int fd, bool temp)
485{
486 struct tracepoint_path *tps;
487 struct tracing_data *tdata;
488 int err;
489
490 output_fd = fd;
491
492 tps = get_tracepoints_path(pattrs);
493 if (!tps)
494 return NULL;
495
496 tdata = malloc(sizeof(*tdata));
497 if (!tdata)
498 return NULL;
499
500 tdata->temp = temp;
501 tdata->size = 0;
502
503 if (temp) {
504 int temp_fd;
505
506 snprintf(tdata->temp_file, sizeof(tdata->temp_file),
507 "/tmp/perf-XXXXXX");
508 if (!mkstemp(tdata->temp_file)) {
509 pr_debug("Can't make temp file");
510 return NULL;
511 }
512
513 temp_fd = open(tdata->temp_file, O_RDWR);
514 if (temp_fd < 0) {
515 pr_debug("Can't read '%s'", tdata->temp_file);
516 return NULL;
517 }
518
519 /*
520 * Set the temp file the default output, so all the
521 * tracing data are stored into it.
522 */
523 output_fd = temp_fd;
524 }
525
526 err = tracing_data_header();
527 if (err)
528 goto out;
529 err = record_header_files();
530 if (err)
531 goto out;
532 err = record_ftrace_files(tps);
533 if (err)
534 goto out;
535 err = record_event_files(tps);
536 if (err)
537 goto out;
538 err = record_proc_kallsyms();
539 if (err)
540 goto out;
541 err = record_ftrace_printk();
542
543out:
544 /*
545 * All tracing data are stored by now, we can restore
546 * the default output file in case we used temp file.
547 */
548 if (temp) {
549 tdata->size = lseek(output_fd, 0, SEEK_CUR);
550 close(output_fd);
551 output_fd = fd;
552 }
553
554 if (err)
555 zfree(&tdata);
556
557 put_tracepoints_path(tps);
558 return tdata;
559}
560
561int tracing_data_put(struct tracing_data *tdata)
562{
563 int err = 0;
564
565 if (tdata->temp) {
566 err = record_file(tdata->temp_file, 0);
567 unlink(tdata->temp_file);
568 }
569
570 free(tdata);
571 return err;
572}
573
574int read_tracing_data(int fd, struct list_head *pattrs)
575{
576 int err;
577 struct tracing_data *tdata;
578
579 /*
580 * We work over the real file, so we can write data
581 * directly, no temp file is needed.
582 */
583 tdata = tracing_data_get(pattrs, fd, false);
584 if (!tdata)
585 return -ENOMEM;
586
587 err = tracing_data_put(tdata);
588 return err;
589}
1/*
2 * Copyright (C) 2008,2009, 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#define _GNU_SOURCE
22#include <dirent.h>
23#include <mntent.h>
24#include <stdio.h>
25#include <stdlib.h>
26#include <string.h>
27#include <stdarg.h>
28#include <sys/types.h>
29#include <sys/stat.h>
30#include <sys/wait.h>
31#include <pthread.h>
32#include <fcntl.h>
33#include <unistd.h>
34#include <ctype.h>
35#include <errno.h>
36#include <stdbool.h>
37#include <linux/list.h>
38#include <linux/kernel.h>
39
40#include "../perf.h"
41#include "trace-event.h"
42#include "debugfs.h"
43#include "evsel.h"
44
45#define VERSION "0.5"
46
47#define _STR(x) #x
48#define STR(x) _STR(x)
49#define MAX_PATH 256
50
51#define TRACE_CTRL "tracing_on"
52#define TRACE "trace"
53#define AVAILABLE "available_tracers"
54#define CURRENT "current_tracer"
55#define ITER_CTRL "trace_options"
56#define MAX_LATENCY "tracing_max_latency"
57
58unsigned int page_size;
59
60static const char *output_file = "trace.info";
61static int output_fd;
62
63struct event_list {
64 struct event_list *next;
65 const char *event;
66};
67
68struct events {
69 struct events *sibling;
70 struct events *children;
71 struct events *next;
72 char *name;
73};
74
75
76
77static void die(const char *fmt, ...)
78{
79 va_list ap;
80 int ret = errno;
81
82 if (errno)
83 perror("trace-cmd");
84 else
85 ret = -1;
86
87 va_start(ap, fmt);
88 fprintf(stderr, " ");
89 vfprintf(stderr, fmt, ap);
90 va_end(ap);
91
92 fprintf(stderr, "\n");
93 exit(ret);
94}
95
96void *malloc_or_die(unsigned int size)
97{
98 void *data;
99
100 data = malloc(size);
101 if (!data)
102 die("malloc");
103 return data;
104}
105
106static const char *find_debugfs(void)
107{
108 const char *path = debugfs_mount(NULL);
109
110 if (!path)
111 die("Your kernel not support debugfs filesystem");
112
113 return path;
114}
115
116/*
117 * Finds the path to the debugfs/tracing
118 * Allocates the string and stores it.
119 */
120static const char *find_tracing_dir(void)
121{
122 static char *tracing;
123 static int tracing_found;
124 const char *debugfs;
125
126 if (tracing_found)
127 return tracing;
128
129 debugfs = find_debugfs();
130
131 tracing = malloc_or_die(strlen(debugfs) + 9);
132
133 sprintf(tracing, "%s/tracing", debugfs);
134
135 tracing_found = 1;
136 return tracing;
137}
138
139static char *get_tracing_file(const char *name)
140{
141 const char *tracing;
142 char *file;
143
144 tracing = find_tracing_dir();
145 if (!tracing)
146 return NULL;
147
148 file = malloc_or_die(strlen(tracing) + strlen(name) + 2);
149
150 sprintf(file, "%s/%s", tracing, name);
151 return file;
152}
153
154static void put_tracing_file(char *file)
155{
156 free(file);
157}
158
159static ssize_t calc_data_size;
160
161static ssize_t write_or_die(const void *buf, size_t len)
162{
163 int ret;
164
165 if (calc_data_size) {
166 calc_data_size += len;
167 return len;
168 }
169
170 ret = write(output_fd, buf, len);
171 if (ret < 0)
172 die("writing to '%s'", output_file);
173
174 return ret;
175}
176
177int bigendian(void)
178{
179 unsigned char str[] = { 0x1, 0x2, 0x3, 0x4, 0x0, 0x0, 0x0, 0x0};
180 unsigned int *ptr;
181
182 ptr = (unsigned int *)(void *)str;
183 return *ptr == 0x01020304;
184}
185
186/* unfortunately, you can not stat debugfs or proc files for size */
187static void record_file(const char *file, size_t hdr_sz)
188{
189 unsigned long long size = 0;
190 char buf[BUFSIZ], *sizep;
191 off_t hdr_pos = lseek(output_fd, 0, SEEK_CUR);
192 int r, fd;
193
194 fd = open(file, O_RDONLY);
195 if (fd < 0)
196 die("Can't read '%s'", file);
197
198 /* put in zeros for file size, then fill true size later */
199 write_or_die(&size, hdr_sz);
200
201 do {
202 r = read(fd, buf, BUFSIZ);
203 if (r > 0) {
204 size += r;
205 write_or_die(buf, r);
206 }
207 } while (r > 0);
208 close(fd);
209
210 /* ugh, handle big-endian hdr_size == 4 */
211 sizep = (char*)&size;
212 if (bigendian())
213 sizep += sizeof(u64) - hdr_sz;
214
215 if (pwrite(output_fd, sizep, hdr_sz, hdr_pos) < 0)
216 die("writing to %s", output_file);
217}
218
219static void read_header_files(void)
220{
221 char *path;
222 struct stat st;
223
224 path = get_tracing_file("events/header_page");
225 if (stat(path, &st) < 0)
226 die("can't read '%s'", path);
227
228 write_or_die("header_page", 12);
229 record_file(path, 8);
230 put_tracing_file(path);
231
232 path = get_tracing_file("events/header_event");
233 if (stat(path, &st) < 0)
234 die("can't read '%s'", path);
235
236 write_or_die("header_event", 13);
237 record_file(path, 8);
238 put_tracing_file(path);
239}
240
241static bool name_in_tp_list(char *sys, struct tracepoint_path *tps)
242{
243 while (tps) {
244 if (!strcmp(sys, tps->name))
245 return true;
246 tps = tps->next;
247 }
248
249 return false;
250}
251
252static void copy_event_system(const char *sys, struct tracepoint_path *tps)
253{
254 struct dirent *dent;
255 struct stat st;
256 char *format;
257 DIR *dir;
258 int count = 0;
259 int ret;
260
261 dir = opendir(sys);
262 if (!dir)
263 die("can't read directory '%s'", sys);
264
265 while ((dent = readdir(dir))) {
266 if (dent->d_type != DT_DIR ||
267 strcmp(dent->d_name, ".") == 0 ||
268 strcmp(dent->d_name, "..") == 0 ||
269 !name_in_tp_list(dent->d_name, tps))
270 continue;
271 format = malloc_or_die(strlen(sys) + strlen(dent->d_name) + 10);
272 sprintf(format, "%s/%s/format", sys, dent->d_name);
273 ret = stat(format, &st);
274 free(format);
275 if (ret < 0)
276 continue;
277 count++;
278 }
279
280 write_or_die(&count, 4);
281
282 rewinddir(dir);
283 while ((dent = readdir(dir))) {
284 if (dent->d_type != DT_DIR ||
285 strcmp(dent->d_name, ".") == 0 ||
286 strcmp(dent->d_name, "..") == 0 ||
287 !name_in_tp_list(dent->d_name, tps))
288 continue;
289 format = malloc_or_die(strlen(sys) + strlen(dent->d_name) + 10);
290 sprintf(format, "%s/%s/format", sys, dent->d_name);
291 ret = stat(format, &st);
292
293 if (ret >= 0)
294 record_file(format, 8);
295
296 free(format);
297 }
298 closedir(dir);
299}
300
301static void read_ftrace_files(struct tracepoint_path *tps)
302{
303 char *path;
304
305 path = get_tracing_file("events/ftrace");
306
307 copy_event_system(path, tps);
308
309 put_tracing_file(path);
310}
311
312static bool system_in_tp_list(char *sys, struct tracepoint_path *tps)
313{
314 while (tps) {
315 if (!strcmp(sys, tps->system))
316 return true;
317 tps = tps->next;
318 }
319
320 return false;
321}
322
323static void read_event_files(struct tracepoint_path *tps)
324{
325 struct dirent *dent;
326 struct stat st;
327 char *path;
328 char *sys;
329 DIR *dir;
330 int count = 0;
331 int ret;
332
333 path = get_tracing_file("events");
334
335 dir = opendir(path);
336 if (!dir)
337 die("can't read directory '%s'", path);
338
339 while ((dent = readdir(dir))) {
340 if (dent->d_type != DT_DIR ||
341 strcmp(dent->d_name, ".") == 0 ||
342 strcmp(dent->d_name, "..") == 0 ||
343 strcmp(dent->d_name, "ftrace") == 0 ||
344 !system_in_tp_list(dent->d_name, tps))
345 continue;
346 count++;
347 }
348
349 write_or_die(&count, 4);
350
351 rewinddir(dir);
352 while ((dent = readdir(dir))) {
353 if (dent->d_type != DT_DIR ||
354 strcmp(dent->d_name, ".") == 0 ||
355 strcmp(dent->d_name, "..") == 0 ||
356 strcmp(dent->d_name, "ftrace") == 0 ||
357 !system_in_tp_list(dent->d_name, tps))
358 continue;
359 sys = malloc_or_die(strlen(path) + strlen(dent->d_name) + 2);
360 sprintf(sys, "%s/%s", path, dent->d_name);
361 ret = stat(sys, &st);
362 if (ret >= 0) {
363 write_or_die(dent->d_name, strlen(dent->d_name) + 1);
364 copy_event_system(sys, tps);
365 }
366 free(sys);
367 }
368
369 closedir(dir);
370 put_tracing_file(path);
371}
372
373static void read_proc_kallsyms(void)
374{
375 unsigned int size;
376 const char *path = "/proc/kallsyms";
377 struct stat st;
378 int ret;
379
380 ret = stat(path, &st);
381 if (ret < 0) {
382 /* not found */
383 size = 0;
384 write_or_die(&size, 4);
385 return;
386 }
387 record_file(path, 4);
388}
389
390static void read_ftrace_printk(void)
391{
392 unsigned int size;
393 char *path;
394 struct stat st;
395 int ret;
396
397 path = get_tracing_file("printk_formats");
398 ret = stat(path, &st);
399 if (ret < 0) {
400 /* not found */
401 size = 0;
402 write_or_die(&size, 4);
403 goto out;
404 }
405 record_file(path, 4);
406
407out:
408 put_tracing_file(path);
409}
410
411static struct tracepoint_path *
412get_tracepoints_path(struct list_head *pattrs)
413{
414 struct tracepoint_path path, *ppath = &path;
415 struct perf_evsel *pos;
416 int nr_tracepoints = 0;
417
418 list_for_each_entry(pos, pattrs, node) {
419 if (pos->attr.type != PERF_TYPE_TRACEPOINT)
420 continue;
421 ++nr_tracepoints;
422 ppath->next = tracepoint_id_to_path(pos->attr.config);
423 if (!ppath->next)
424 die("%s\n", "No memory to alloc tracepoints list");
425 ppath = ppath->next;
426 }
427
428 return nr_tracepoints > 0 ? path.next : NULL;
429}
430
431bool have_tracepoints(struct list_head *pattrs)
432{
433 struct perf_evsel *pos;
434
435 list_for_each_entry(pos, pattrs, node)
436 if (pos->attr.type == PERF_TYPE_TRACEPOINT)
437 return true;
438
439 return false;
440}
441
442int read_tracing_data(int fd, struct list_head *pattrs)
443{
444 char buf[BUFSIZ];
445 struct tracepoint_path *tps = get_tracepoints_path(pattrs);
446
447 /*
448 * What? No tracepoints? No sense writing anything here, bail out.
449 */
450 if (tps == NULL)
451 return -1;
452
453 output_fd = fd;
454
455 buf[0] = 23;
456 buf[1] = 8;
457 buf[2] = 68;
458 memcpy(buf + 3, "tracing", 7);
459
460 write_or_die(buf, 10);
461
462 write_or_die(VERSION, strlen(VERSION) + 1);
463
464 /* save endian */
465 if (bigendian())
466 buf[0] = 1;
467 else
468 buf[0] = 0;
469
470 write_or_die(buf, 1);
471
472 /* save size of long */
473 buf[0] = sizeof(long);
474 write_or_die(buf, 1);
475
476 /* save page_size */
477 page_size = sysconf(_SC_PAGESIZE);
478 write_or_die(&page_size, 4);
479
480 read_header_files();
481 read_ftrace_files(tps);
482 read_event_files(tps);
483 read_proc_kallsyms();
484 read_ftrace_printk();
485
486 return 0;
487}
488
489ssize_t read_tracing_data_size(int fd, struct list_head *pattrs)
490{
491 ssize_t size;
492 int err = 0;
493
494 calc_data_size = 1;
495 err = read_tracing_data(fd, pattrs);
496 size = calc_data_size - 1;
497 calc_data_size = 0;
498
499 if (err < 0)
500 return err;
501
502 return size;
503}