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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2008,2009, Steven Rostedt <srostedt@redhat.com>
4 */
5#include <dirent.h>
6#include <mntent.h>
7#include <stdio.h>
8#include <stdlib.h>
9#include <string.h>
10#include <stdarg.h>
11#include <sys/types.h>
12#include <sys/stat.h>
13#include <sys/wait.h>
14#include <fcntl.h>
15#include <unistd.h>
16#include <errno.h>
17#include <stdbool.h>
18#include <linux/list.h>
19#include <linux/kernel.h>
20#include <linux/zalloc.h>
21#include <internal/lib.h> // page_size
22
23#include "trace-event.h"
24#include <api/fs/tracing_path.h>
25#include "evsel.h"
26#include "debug.h"
27
28#define VERSION "0.6"
29
30static int output_fd;
31
32
33int bigendian(void)
34{
35 unsigned char str[] = { 0x1, 0x2, 0x3, 0x4, 0x0, 0x0, 0x0, 0x0};
36 unsigned int *ptr;
37
38 ptr = (unsigned int *)(void *)str;
39 return *ptr == 0x01020304;
40}
41
42/* unfortunately, you can not stat debugfs or proc files for size */
43static int record_file(const char *file, ssize_t hdr_sz)
44{
45 unsigned long long size = 0;
46 char buf[BUFSIZ], *sizep;
47 off_t hdr_pos = lseek(output_fd, 0, SEEK_CUR);
48 int r, fd;
49 int err = -EIO;
50
51 fd = open(file, O_RDONLY);
52 if (fd < 0) {
53 pr_debug("Can't read '%s'", file);
54 return -errno;
55 }
56
57 /* put in zeros for file size, then fill true size later */
58 if (hdr_sz) {
59 if (write(output_fd, &size, hdr_sz) != hdr_sz)
60 goto out;
61 }
62
63 do {
64 r = read(fd, buf, BUFSIZ);
65 if (r > 0) {
66 size += r;
67 if (write(output_fd, buf, r) != r)
68 goto out;
69 }
70 } while (r > 0);
71
72 /* ugh, handle big-endian hdr_size == 4 */
73 sizep = (char*)&size;
74 if (bigendian())
75 sizep += sizeof(u64) - hdr_sz;
76
77 if (hdr_sz && pwrite(output_fd, sizep, hdr_sz, hdr_pos) < 0) {
78 pr_debug("writing file size failed\n");
79 goto out;
80 }
81
82 err = 0;
83out:
84 close(fd);
85 return err;
86}
87
88static int record_header_files(void)
89{
90 char *path = get_events_file("header_page");
91 struct stat st;
92 int err = -EIO;
93
94 if (!path) {
95 pr_debug("can't get tracing/events/header_page");
96 return -ENOMEM;
97 }
98
99 if (stat(path, &st) < 0) {
100 pr_debug("can't read '%s'", path);
101 goto out;
102 }
103
104 if (write(output_fd, "header_page", 12) != 12) {
105 pr_debug("can't write header_page\n");
106 goto out;
107 }
108
109 if (record_file(path, 8) < 0) {
110 pr_debug("can't record header_page file\n");
111 goto out;
112 }
113
114 put_events_file(path);
115
116 path = get_events_file("header_event");
117 if (!path) {
118 pr_debug("can't get tracing/events/header_event");
119 err = -ENOMEM;
120 goto out;
121 }
122
123 if (stat(path, &st) < 0) {
124 pr_debug("can't read '%s'", path);
125 goto out;
126 }
127
128 if (write(output_fd, "header_event", 13) != 13) {
129 pr_debug("can't write header_event\n");
130 goto out;
131 }
132
133 if (record_file(path, 8) < 0) {
134 pr_debug("can't record header_event file\n");
135 goto out;
136 }
137
138 err = 0;
139out:
140 put_events_file(path);
141 return err;
142}
143
144static bool name_in_tp_list(char *sys, struct tracepoint_path *tps)
145{
146 while (tps) {
147 if (!strcmp(sys, tps->name))
148 return true;
149 tps = tps->next;
150 }
151
152 return false;
153}
154
155#define for_each_event(dir, dent, tps) \
156 while ((dent = readdir(dir))) \
157 if (dent->d_type == DT_DIR && \
158 (strcmp(dent->d_name, ".")) && \
159 (strcmp(dent->d_name, ".."))) \
160
161static int copy_event_system(const char *sys, struct tracepoint_path *tps)
162{
163 struct dirent *dent;
164 struct stat st;
165 char *format;
166 DIR *dir;
167 int count = 0;
168 int ret;
169 int err;
170
171 dir = opendir(sys);
172 if (!dir) {
173 pr_debug("can't read directory '%s'", sys);
174 return -errno;
175 }
176
177 for_each_event(dir, dent, tps) {
178 if (!name_in_tp_list(dent->d_name, tps))
179 continue;
180
181 if (asprintf(&format, "%s/%s/format", sys, dent->d_name) < 0) {
182 err = -ENOMEM;
183 goto out;
184 }
185 ret = stat(format, &st);
186 free(format);
187 if (ret < 0)
188 continue;
189 count++;
190 }
191
192 if (write(output_fd, &count, 4) != 4) {
193 err = -EIO;
194 pr_debug("can't write count\n");
195 goto out;
196 }
197
198 rewinddir(dir);
199 for_each_event(dir, dent, tps) {
200 if (!name_in_tp_list(dent->d_name, tps))
201 continue;
202
203 if (asprintf(&format, "%s/%s/format", sys, dent->d_name) < 0) {
204 err = -ENOMEM;
205 goto out;
206 }
207 ret = stat(format, &st);
208
209 if (ret >= 0) {
210 err = record_file(format, 8);
211 if (err) {
212 free(format);
213 goto out;
214 }
215 }
216 free(format);
217 }
218 err = 0;
219out:
220 closedir(dir);
221 return err;
222}
223
224static int record_ftrace_files(struct tracepoint_path *tps)
225{
226 char *path;
227 int ret;
228
229 path = get_events_file("ftrace");
230 if (!path) {
231 pr_debug("can't get tracing/events/ftrace");
232 return -ENOMEM;
233 }
234
235 ret = copy_event_system(path, tps);
236
237 put_tracing_file(path);
238
239 return ret;
240}
241
242static bool system_in_tp_list(char *sys, struct tracepoint_path *tps)
243{
244 while (tps) {
245 if (!strcmp(sys, tps->system))
246 return true;
247 tps = tps->next;
248 }
249
250 return false;
251}
252
253static int record_event_files(struct tracepoint_path *tps)
254{
255 struct dirent *dent;
256 struct stat st;
257 char *path;
258 char *sys;
259 DIR *dir;
260 int count = 0;
261 int ret;
262 int err;
263
264 path = get_tracing_file("events");
265 if (!path) {
266 pr_debug("can't get tracing/events");
267 return -ENOMEM;
268 }
269
270 dir = opendir(path);
271 if (!dir) {
272 err = -errno;
273 pr_debug("can't read directory '%s'", path);
274 goto out;
275 }
276
277 for_each_event(dir, dent, tps) {
278 if (strcmp(dent->d_name, "ftrace") == 0 ||
279 !system_in_tp_list(dent->d_name, tps))
280 continue;
281
282 count++;
283 }
284
285 if (write(output_fd, &count, 4) != 4) {
286 err = -EIO;
287 pr_debug("can't write count\n");
288 goto out;
289 }
290
291 rewinddir(dir);
292 for_each_event(dir, dent, tps) {
293 if (strcmp(dent->d_name, "ftrace") == 0 ||
294 !system_in_tp_list(dent->d_name, tps))
295 continue;
296
297 if (asprintf(&sys, "%s/%s", path, dent->d_name) < 0) {
298 err = -ENOMEM;
299 goto out;
300 }
301 ret = stat(sys, &st);
302 if (ret >= 0) {
303 ssize_t size = strlen(dent->d_name) + 1;
304
305 if (write(output_fd, dent->d_name, size) != size ||
306 copy_event_system(sys, tps) < 0) {
307 err = -EIO;
308 free(sys);
309 goto out;
310 }
311 }
312 free(sys);
313 }
314 err = 0;
315out:
316 closedir(dir);
317 put_tracing_file(path);
318
319 return err;
320}
321
322static int record_proc_kallsyms(void)
323{
324 unsigned long long size = 0;
325 /*
326 * Just to keep older perf.data file parsers happy, record a zero
327 * sized kallsyms file, i.e. do the same thing that was done when
328 * /proc/kallsyms (or something specified via --kallsyms, in a
329 * different path) couldn't be read.
330 */
331 return write(output_fd, &size, 4) != 4 ? -EIO : 0;
332}
333
334static int record_ftrace_printk(void)
335{
336 unsigned int size;
337 char *path;
338 struct stat st;
339 int ret, err = 0;
340
341 path = get_tracing_file("printk_formats");
342 if (!path) {
343 pr_debug("can't get tracing/printk_formats");
344 return -ENOMEM;
345 }
346
347 ret = stat(path, &st);
348 if (ret < 0) {
349 /* not found */
350 size = 0;
351 if (write(output_fd, &size, 4) != 4)
352 err = -EIO;
353 goto out;
354 }
355 err = record_file(path, 4);
356
357out:
358 put_tracing_file(path);
359 return err;
360}
361
362static int record_saved_cmdline(void)
363{
364 unsigned long long size;
365 char *path;
366 struct stat st;
367 int ret, err = 0;
368
369 path = get_tracing_file("saved_cmdlines");
370 if (!path) {
371 pr_debug("can't get tracing/saved_cmdline");
372 return -ENOMEM;
373 }
374
375 ret = stat(path, &st);
376 if (ret < 0) {
377 /* not found */
378 size = 0;
379 if (write(output_fd, &size, 8) != 8)
380 err = -EIO;
381 goto out;
382 }
383 err = record_file(path, 8);
384
385out:
386 put_tracing_file(path);
387 return err;
388}
389
390static void
391put_tracepoints_path(struct tracepoint_path *tps)
392{
393 while (tps) {
394 struct tracepoint_path *t = tps;
395
396 tps = tps->next;
397 zfree(&t->name);
398 zfree(&t->system);
399 free(t);
400 }
401}
402
403static struct tracepoint_path *
404get_tracepoints_path(struct list_head *pattrs)
405{
406 struct tracepoint_path path, *ppath = &path;
407 struct evsel *pos;
408 int nr_tracepoints = 0;
409
410 list_for_each_entry(pos, pattrs, core.node) {
411 if (pos->core.attr.type != PERF_TYPE_TRACEPOINT)
412 continue;
413 ++nr_tracepoints;
414
415 if (pos->name) {
416 ppath->next = tracepoint_name_to_path(pos->name);
417 if (ppath->next)
418 goto next;
419
420 if (strchr(pos->name, ':') == NULL)
421 goto try_id;
422
423 goto error;
424 }
425
426try_id:
427 ppath->next = tracepoint_id_to_path(pos->core.attr.config);
428 if (!ppath->next) {
429error:
430 pr_debug("No memory to alloc tracepoints list\n");
431 put_tracepoints_path(&path);
432 return NULL;
433 }
434next:
435 ppath = ppath->next;
436 }
437
438 return nr_tracepoints > 0 ? path.next : NULL;
439}
440
441bool have_tracepoints(struct list_head *pattrs)
442{
443 struct evsel *pos;
444
445 list_for_each_entry(pos, pattrs, core.node)
446 if (pos->core.attr.type == PERF_TYPE_TRACEPOINT)
447 return true;
448
449 return false;
450}
451
452static int tracing_data_header(void)
453{
454 char buf[20];
455 ssize_t size;
456
457 /* just guessing this is someone's birthday.. ;) */
458 buf[0] = 23;
459 buf[1] = 8;
460 buf[2] = 68;
461 memcpy(buf + 3, "tracing", 7);
462
463 if (write(output_fd, buf, 10) != 10)
464 return -1;
465
466 size = strlen(VERSION) + 1;
467 if (write(output_fd, VERSION, size) != size)
468 return -1;
469
470 /* save endian */
471 if (bigendian())
472 buf[0] = 1;
473 else
474 buf[0] = 0;
475
476 if (write(output_fd, buf, 1) != 1)
477 return -1;
478
479 /* save size of long */
480 buf[0] = sizeof(long);
481 if (write(output_fd, buf, 1) != 1)
482 return -1;
483
484 /* save page_size */
485 if (write(output_fd, &page_size, 4) != 4)
486 return -1;
487
488 return 0;
489}
490
491struct tracing_data *tracing_data_get(struct list_head *pattrs,
492 int fd, bool temp)
493{
494 struct tracepoint_path *tps;
495 struct tracing_data *tdata;
496 int err;
497
498 output_fd = fd;
499
500 tps = get_tracepoints_path(pattrs);
501 if (!tps)
502 return NULL;
503
504 tdata = malloc(sizeof(*tdata));
505 if (!tdata)
506 return NULL;
507
508 tdata->temp = temp;
509 tdata->size = 0;
510
511 if (temp) {
512 int temp_fd;
513
514 snprintf(tdata->temp_file, sizeof(tdata->temp_file),
515 "/tmp/perf-XXXXXX");
516 if (!mkstemp(tdata->temp_file)) {
517 pr_debug("Can't make temp file");
518 free(tdata);
519 return NULL;
520 }
521
522 temp_fd = open(tdata->temp_file, O_RDWR);
523 if (temp_fd < 0) {
524 pr_debug("Can't read '%s'", tdata->temp_file);
525 free(tdata);
526 return NULL;
527 }
528
529 /*
530 * Set the temp file the default output, so all the
531 * tracing data are stored into it.
532 */
533 output_fd = temp_fd;
534 }
535
536 err = tracing_data_header();
537 if (err)
538 goto out;
539 err = record_header_files();
540 if (err)
541 goto out;
542 err = record_ftrace_files(tps);
543 if (err)
544 goto out;
545 err = record_event_files(tps);
546 if (err)
547 goto out;
548 err = record_proc_kallsyms();
549 if (err)
550 goto out;
551 err = record_ftrace_printk();
552 if (err)
553 goto out;
554 err = record_saved_cmdline();
555
556out:
557 /*
558 * All tracing data are stored by now, we can restore
559 * the default output file in case we used temp file.
560 */
561 if (temp) {
562 tdata->size = lseek(output_fd, 0, SEEK_CUR);
563 close(output_fd);
564 output_fd = fd;
565 }
566
567 if (err)
568 zfree(&tdata);
569
570 put_tracepoints_path(tps);
571 return tdata;
572}
573
574int tracing_data_put(struct tracing_data *tdata)
575{
576 int err = 0;
577
578 if (tdata->temp) {
579 err = record_file(tdata->temp_file, 0);
580 unlink(tdata->temp_file);
581 }
582
583 free(tdata);
584 return err;
585}
586
587int read_tracing_data(int fd, struct list_head *pattrs)
588{
589 int err;
590 struct tracing_data *tdata;
591
592 /*
593 * We work over the real file, so we can write data
594 * directly, no temp file is needed.
595 */
596 tdata = tracing_data_get(pattrs, fd, false);
597 if (!tdata)
598 return -ENOMEM;
599
600 err = tracing_data_put(tdata);
601 return err;
602}
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 "debugfs.h"
42#include "evsel.h"
43
44#define VERSION "0.5"
45
46#define TRACE_CTRL "tracing_on"
47#define TRACE "trace"
48#define AVAILABLE "available_tracers"
49#define CURRENT "current_tracer"
50#define ITER_CTRL "trace_options"
51#define MAX_LATENCY "tracing_max_latency"
52
53unsigned int page_size;
54
55static const char *output_file = "trace.info";
56static int output_fd;
57
58struct event_list {
59 struct event_list *next;
60 const char *event;
61};
62
63struct events {
64 struct events *sibling;
65 struct events *children;
66 struct events *next;
67 char *name;
68};
69
70
71static void *malloc_or_die(unsigned int size)
72{
73 void *data;
74
75 data = malloc(size);
76 if (!data)
77 die("malloc");
78 return data;
79}
80
81static const char *find_debugfs(void)
82{
83 const char *path = debugfs_mount(NULL);
84
85 if (!path)
86 die("Your kernel not support debugfs filesystem");
87
88 return path;
89}
90
91/*
92 * Finds the path to the debugfs/tracing
93 * Allocates the string and stores it.
94 */
95static const char *find_tracing_dir(void)
96{
97 static char *tracing;
98 static int tracing_found;
99 const char *debugfs;
100
101 if (tracing_found)
102 return tracing;
103
104 debugfs = find_debugfs();
105
106 tracing = malloc_or_die(strlen(debugfs) + 9);
107
108 sprintf(tracing, "%s/tracing", debugfs);
109
110 tracing_found = 1;
111 return tracing;
112}
113
114static char *get_tracing_file(const char *name)
115{
116 const char *tracing;
117 char *file;
118
119 tracing = find_tracing_dir();
120 if (!tracing)
121 return NULL;
122
123 file = malloc_or_die(strlen(tracing) + strlen(name) + 2);
124
125 sprintf(file, "%s/%s", tracing, name);
126 return file;
127}
128
129static void put_tracing_file(char *file)
130{
131 free(file);
132}
133
134static ssize_t calc_data_size;
135
136static ssize_t write_or_die(const void *buf, size_t len)
137{
138 int ret;
139
140 if (calc_data_size) {
141 calc_data_size += len;
142 return len;
143 }
144
145 ret = write(output_fd, buf, len);
146 if (ret < 0)
147 die("writing to '%s'", output_file);
148
149 return ret;
150}
151
152int bigendian(void)
153{
154 unsigned char str[] = { 0x1, 0x2, 0x3, 0x4, 0x0, 0x0, 0x0, 0x0};
155 unsigned int *ptr;
156
157 ptr = (unsigned int *)(void *)str;
158 return *ptr == 0x01020304;
159}
160
161/* unfortunately, you can not stat debugfs or proc files for size */
162static void record_file(const char *file, size_t hdr_sz)
163{
164 unsigned long long size = 0;
165 char buf[BUFSIZ], *sizep;
166 off_t hdr_pos = lseek(output_fd, 0, SEEK_CUR);
167 int r, fd;
168
169 fd = open(file, O_RDONLY);
170 if (fd < 0)
171 die("Can't read '%s'", file);
172
173 /* put in zeros for file size, then fill true size later */
174 if (hdr_sz)
175 write_or_die(&size, hdr_sz);
176
177 do {
178 r = read(fd, buf, BUFSIZ);
179 if (r > 0) {
180 size += r;
181 write_or_die(buf, r);
182 }
183 } while (r > 0);
184 close(fd);
185
186 /* ugh, handle big-endian hdr_size == 4 */
187 sizep = (char*)&size;
188 if (bigendian())
189 sizep += sizeof(u64) - hdr_sz;
190
191 if (hdr_sz && pwrite(output_fd, sizep, hdr_sz, hdr_pos) < 0)
192 die("writing to %s", output_file);
193}
194
195static void read_header_files(void)
196{
197 char *path;
198 struct stat st;
199
200 path = get_tracing_file("events/header_page");
201 if (stat(path, &st) < 0)
202 die("can't read '%s'", path);
203
204 write_or_die("header_page", 12);
205 record_file(path, 8);
206 put_tracing_file(path);
207
208 path = get_tracing_file("events/header_event");
209 if (stat(path, &st) < 0)
210 die("can't read '%s'", path);
211
212 write_or_die("header_event", 13);
213 record_file(path, 8);
214 put_tracing_file(path);
215}
216
217static bool name_in_tp_list(char *sys, struct tracepoint_path *tps)
218{
219 while (tps) {
220 if (!strcmp(sys, tps->name))
221 return true;
222 tps = tps->next;
223 }
224
225 return false;
226}
227
228static void copy_event_system(const char *sys, struct tracepoint_path *tps)
229{
230 struct dirent *dent;
231 struct stat st;
232 char *format;
233 DIR *dir;
234 int count = 0;
235 int ret;
236
237 dir = opendir(sys);
238 if (!dir)
239 die("can't read directory '%s'", sys);
240
241 while ((dent = readdir(dir))) {
242 if (dent->d_type != DT_DIR ||
243 strcmp(dent->d_name, ".") == 0 ||
244 strcmp(dent->d_name, "..") == 0 ||
245 !name_in_tp_list(dent->d_name, tps))
246 continue;
247 format = malloc_or_die(strlen(sys) + strlen(dent->d_name) + 10);
248 sprintf(format, "%s/%s/format", sys, dent->d_name);
249 ret = stat(format, &st);
250 free(format);
251 if (ret < 0)
252 continue;
253 count++;
254 }
255
256 write_or_die(&count, 4);
257
258 rewinddir(dir);
259 while ((dent = readdir(dir))) {
260 if (dent->d_type != DT_DIR ||
261 strcmp(dent->d_name, ".") == 0 ||
262 strcmp(dent->d_name, "..") == 0 ||
263 !name_in_tp_list(dent->d_name, tps))
264 continue;
265 format = malloc_or_die(strlen(sys) + strlen(dent->d_name) + 10);
266 sprintf(format, "%s/%s/format", sys, dent->d_name);
267 ret = stat(format, &st);
268
269 if (ret >= 0)
270 record_file(format, 8);
271
272 free(format);
273 }
274 closedir(dir);
275}
276
277static void read_ftrace_files(struct tracepoint_path *tps)
278{
279 char *path;
280
281 path = get_tracing_file("events/ftrace");
282
283 copy_event_system(path, tps);
284
285 put_tracing_file(path);
286}
287
288static bool system_in_tp_list(char *sys, struct tracepoint_path *tps)
289{
290 while (tps) {
291 if (!strcmp(sys, tps->system))
292 return true;
293 tps = tps->next;
294 }
295
296 return false;
297}
298
299static void read_event_files(struct tracepoint_path *tps)
300{
301 struct dirent *dent;
302 struct stat st;
303 char *path;
304 char *sys;
305 DIR *dir;
306 int count = 0;
307 int ret;
308
309 path = get_tracing_file("events");
310
311 dir = opendir(path);
312 if (!dir)
313 die("can't read directory '%s'", path);
314
315 while ((dent = readdir(dir))) {
316 if (dent->d_type != DT_DIR ||
317 strcmp(dent->d_name, ".") == 0 ||
318 strcmp(dent->d_name, "..") == 0 ||
319 strcmp(dent->d_name, "ftrace") == 0 ||
320 !system_in_tp_list(dent->d_name, tps))
321 continue;
322 count++;
323 }
324
325 write_or_die(&count, 4);
326
327 rewinddir(dir);
328 while ((dent = readdir(dir))) {
329 if (dent->d_type != DT_DIR ||
330 strcmp(dent->d_name, ".") == 0 ||
331 strcmp(dent->d_name, "..") == 0 ||
332 strcmp(dent->d_name, "ftrace") == 0 ||
333 !system_in_tp_list(dent->d_name, tps))
334 continue;
335 sys = malloc_or_die(strlen(path) + strlen(dent->d_name) + 2);
336 sprintf(sys, "%s/%s", path, dent->d_name);
337 ret = stat(sys, &st);
338 if (ret >= 0) {
339 write_or_die(dent->d_name, strlen(dent->d_name) + 1);
340 copy_event_system(sys, tps);
341 }
342 free(sys);
343 }
344
345 closedir(dir);
346 put_tracing_file(path);
347}
348
349static void read_proc_kallsyms(void)
350{
351 unsigned int size;
352 const char *path = "/proc/kallsyms";
353 struct stat st;
354 int ret;
355
356 ret = stat(path, &st);
357 if (ret < 0) {
358 /* not found */
359 size = 0;
360 write_or_die(&size, 4);
361 return;
362 }
363 record_file(path, 4);
364}
365
366static void read_ftrace_printk(void)
367{
368 unsigned int size;
369 char *path;
370 struct stat st;
371 int ret;
372
373 path = get_tracing_file("printk_formats");
374 ret = stat(path, &st);
375 if (ret < 0) {
376 /* not found */
377 size = 0;
378 write_or_die(&size, 4);
379 goto out;
380 }
381 record_file(path, 4);
382
383out:
384 put_tracing_file(path);
385}
386
387static struct tracepoint_path *
388get_tracepoints_path(struct list_head *pattrs)
389{
390 struct tracepoint_path path, *ppath = &path;
391 struct perf_evsel *pos;
392 int nr_tracepoints = 0;
393
394 list_for_each_entry(pos, pattrs, node) {
395 if (pos->attr.type != PERF_TYPE_TRACEPOINT)
396 continue;
397 ++nr_tracepoints;
398 ppath->next = tracepoint_id_to_path(pos->attr.config);
399 if (!ppath->next)
400 die("%s\n", "No memory to alloc tracepoints list");
401 ppath = ppath->next;
402 }
403
404 return nr_tracepoints > 0 ? path.next : NULL;
405}
406
407static void
408put_tracepoints_path(struct tracepoint_path *tps)
409{
410 while (tps) {
411 struct tracepoint_path *t = tps;
412
413 tps = tps->next;
414 free(t->name);
415 free(t->system);
416 free(t);
417 }
418}
419
420bool have_tracepoints(struct list_head *pattrs)
421{
422 struct perf_evsel *pos;
423
424 list_for_each_entry(pos, pattrs, node)
425 if (pos->attr.type == PERF_TYPE_TRACEPOINT)
426 return true;
427
428 return false;
429}
430
431static void tracing_data_header(void)
432{
433 char buf[20];
434
435 /* just guessing this is someone's birthday.. ;) */
436 buf[0] = 23;
437 buf[1] = 8;
438 buf[2] = 68;
439 memcpy(buf + 3, "tracing", 7);
440
441 write_or_die(buf, 10);
442
443 write_or_die(VERSION, strlen(VERSION) + 1);
444
445 /* save endian */
446 if (bigendian())
447 buf[0] = 1;
448 else
449 buf[0] = 0;
450
451 read_trace_init(buf[0], buf[0]);
452
453 write_or_die(buf, 1);
454
455 /* save size of long */
456 buf[0] = sizeof(long);
457 write_or_die(buf, 1);
458
459 /* save page_size */
460 page_size = sysconf(_SC_PAGESIZE);
461 write_or_die(&page_size, 4);
462}
463
464struct tracing_data *tracing_data_get(struct list_head *pattrs,
465 int fd, bool temp)
466{
467 struct tracepoint_path *tps;
468 struct tracing_data *tdata;
469
470 output_fd = fd;
471
472 tps = get_tracepoints_path(pattrs);
473 if (!tps)
474 return NULL;
475
476 tdata = malloc_or_die(sizeof(*tdata));
477 tdata->temp = temp;
478 tdata->size = 0;
479
480 if (temp) {
481 int temp_fd;
482
483 snprintf(tdata->temp_file, sizeof(tdata->temp_file),
484 "/tmp/perf-XXXXXX");
485 if (!mkstemp(tdata->temp_file))
486 die("Can't make temp file");
487
488 temp_fd = open(tdata->temp_file, O_RDWR);
489 if (temp_fd < 0)
490 die("Can't read '%s'", tdata->temp_file);
491
492 /*
493 * Set the temp file the default output, so all the
494 * tracing data are stored into it.
495 */
496 output_fd = temp_fd;
497 }
498
499 tracing_data_header();
500 read_header_files();
501 read_ftrace_files(tps);
502 read_event_files(tps);
503 read_proc_kallsyms();
504 read_ftrace_printk();
505
506 /*
507 * All tracing data are stored by now, we can restore
508 * the default output file in case we used temp file.
509 */
510 if (temp) {
511 tdata->size = lseek(output_fd, 0, SEEK_CUR);
512 close(output_fd);
513 output_fd = fd;
514 }
515
516 put_tracepoints_path(tps);
517 return tdata;
518}
519
520void tracing_data_put(struct tracing_data *tdata)
521{
522 if (tdata->temp) {
523 record_file(tdata->temp_file, 0);
524 unlink(tdata->temp_file);
525 }
526
527 free(tdata);
528}
529
530int read_tracing_data(int fd, struct list_head *pattrs)
531{
532 struct tracing_data *tdata;
533
534 /*
535 * We work over the real file, so we can write data
536 * directly, no temp file is needed.
537 */
538 tdata = tracing_data_get(pattrs, fd, false);
539 if (!tdata)
540 return -ENOMEM;
541
542 tracing_data_put(tdata);
543 return 0;
544}