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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#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}
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 <fcntl.h>
32#include <unistd.h>
33#include <errno.h>
34#include <stdbool.h>
35#include <linux/list.h>
36#include <linux/kernel.h>
37
38#include "../perf.h"
39#include "trace-event.h"
40#include <api/fs/tracing_path.h>
41#include "evsel.h"
42#include "debug.h"
43
44#define VERSION "0.6"
45
46static int output_fd;
47
48
49int bigendian(void)
50{
51 unsigned char str[] = { 0x1, 0x2, 0x3, 0x4, 0x0, 0x0, 0x0, 0x0};
52 unsigned int *ptr;
53
54 ptr = (unsigned int *)(void *)str;
55 return *ptr == 0x01020304;
56}
57
58/* unfortunately, you can not stat debugfs or proc files for size */
59static int record_file(const char *file, ssize_t hdr_sz)
60{
61 unsigned long long size = 0;
62 char buf[BUFSIZ], *sizep;
63 off_t hdr_pos = lseek(output_fd, 0, SEEK_CUR);
64 int r, fd;
65 int err = -EIO;
66
67 fd = open(file, O_RDONLY);
68 if (fd < 0) {
69 pr_debug("Can't read '%s'", file);
70 return -errno;
71 }
72
73 /* put in zeros for file size, then fill true size later */
74 if (hdr_sz) {
75 if (write(output_fd, &size, hdr_sz) != hdr_sz)
76 goto out;
77 }
78
79 do {
80 r = read(fd, buf, BUFSIZ);
81 if (r > 0) {
82 size += r;
83 if (write(output_fd, buf, r) != r)
84 goto out;
85 }
86 } while (r > 0);
87
88 /* ugh, handle big-endian hdr_size == 4 */
89 sizep = (char*)&size;
90 if (bigendian())
91 sizep += sizeof(u64) - hdr_sz;
92
93 if (hdr_sz && pwrite(output_fd, sizep, hdr_sz, hdr_pos) < 0) {
94 pr_debug("writing file size failed\n");
95 goto out;
96 }
97
98 err = 0;
99out:
100 close(fd);
101 return err;
102}
103
104static int record_header_files(void)
105{
106 char *path;
107 struct stat st;
108 int err = -EIO;
109
110 path = get_tracing_file("events/header_page");
111 if (!path) {
112 pr_debug("can't get tracing/events/header_page");
113 return -ENOMEM;
114 }
115
116 if (stat(path, &st) < 0) {
117 pr_debug("can't read '%s'", path);
118 goto out;
119 }
120
121 if (write(output_fd, "header_page", 12) != 12) {
122 pr_debug("can't write header_page\n");
123 goto out;
124 }
125
126 if (record_file(path, 8) < 0) {
127 pr_debug("can't record header_page file\n");
128 goto out;
129 }
130
131 put_tracing_file(path);
132
133 path = get_tracing_file("events/header_event");
134 if (!path) {
135 pr_debug("can't get tracing/events/header_event");
136 err = -ENOMEM;
137 goto out;
138 }
139
140 if (stat(path, &st) < 0) {
141 pr_debug("can't read '%s'", path);
142 goto out;
143 }
144
145 if (write(output_fd, "header_event", 13) != 13) {
146 pr_debug("can't write header_event\n");
147 goto out;
148 }
149
150 if (record_file(path, 8) < 0) {
151 pr_debug("can't record header_event file\n");
152 goto out;
153 }
154
155 err = 0;
156out:
157 put_tracing_file(path);
158 return err;
159}
160
161static bool name_in_tp_list(char *sys, struct tracepoint_path *tps)
162{
163 while (tps) {
164 if (!strcmp(sys, tps->name))
165 return true;
166 tps = tps->next;
167 }
168
169 return false;
170}
171
172#define for_each_event(dir, dent, tps) \
173 while ((dent = readdir(dir))) \
174 if (dent->d_type == DT_DIR && \
175 (strcmp(dent->d_name, ".")) && \
176 (strcmp(dent->d_name, ".."))) \
177
178static int copy_event_system(const char *sys, struct tracepoint_path *tps)
179{
180 struct dirent *dent;
181 struct stat st;
182 char *format;
183 DIR *dir;
184 int count = 0;
185 int ret;
186 int err;
187
188 dir = opendir(sys);
189 if (!dir) {
190 pr_debug("can't read directory '%s'", sys);
191 return -errno;
192 }
193
194 for_each_event(dir, dent, tps) {
195 if (!name_in_tp_list(dent->d_name, tps))
196 continue;
197
198 if (asprintf(&format, "%s/%s/format", sys, dent->d_name) < 0) {
199 err = -ENOMEM;
200 goto out;
201 }
202 ret = stat(format, &st);
203 free(format);
204 if (ret < 0)
205 continue;
206 count++;
207 }
208
209 if (write(output_fd, &count, 4) != 4) {
210 err = -EIO;
211 pr_debug("can't write count\n");
212 goto out;
213 }
214
215 rewinddir(dir);
216 for_each_event(dir, dent, tps) {
217 if (!name_in_tp_list(dent->d_name, tps))
218 continue;
219
220 if (asprintf(&format, "%s/%s/format", sys, dent->d_name) < 0) {
221 err = -ENOMEM;
222 goto out;
223 }
224 ret = stat(format, &st);
225
226 if (ret >= 0) {
227 err = record_file(format, 8);
228 if (err) {
229 free(format);
230 goto out;
231 }
232 }
233 free(format);
234 }
235 err = 0;
236out:
237 closedir(dir);
238 return err;
239}
240
241static int record_ftrace_files(struct tracepoint_path *tps)
242{
243 char *path;
244 int ret;
245
246 path = get_tracing_file("events/ftrace");
247 if (!path) {
248 pr_debug("can't get tracing/events/ftrace");
249 return -ENOMEM;
250 }
251
252 ret = copy_event_system(path, tps);
253
254 put_tracing_file(path);
255
256 return ret;
257}
258
259static bool system_in_tp_list(char *sys, struct tracepoint_path *tps)
260{
261 while (tps) {
262 if (!strcmp(sys, tps->system))
263 return true;
264 tps = tps->next;
265 }
266
267 return false;
268}
269
270static int record_event_files(struct tracepoint_path *tps)
271{
272 struct dirent *dent;
273 struct stat st;
274 char *path;
275 char *sys;
276 DIR *dir;
277 int count = 0;
278 int ret;
279 int err;
280
281 path = get_tracing_file("events");
282 if (!path) {
283 pr_debug("can't get tracing/events");
284 return -ENOMEM;
285 }
286
287 dir = opendir(path);
288 if (!dir) {
289 err = -errno;
290 pr_debug("can't read directory '%s'", path);
291 goto out;
292 }
293
294 for_each_event(dir, dent, tps) {
295 if (strcmp(dent->d_name, "ftrace") == 0 ||
296 !system_in_tp_list(dent->d_name, tps))
297 continue;
298
299 count++;
300 }
301
302 if (write(output_fd, &count, 4) != 4) {
303 err = -EIO;
304 pr_debug("can't write count\n");
305 goto out;
306 }
307
308 rewinddir(dir);
309 for_each_event(dir, dent, tps) {
310 if (strcmp(dent->d_name, "ftrace") == 0 ||
311 !system_in_tp_list(dent->d_name, tps))
312 continue;
313
314 if (asprintf(&sys, "%s/%s", path, dent->d_name) < 0) {
315 err = -ENOMEM;
316 goto out;
317 }
318 ret = stat(sys, &st);
319 if (ret >= 0) {
320 ssize_t size = strlen(dent->d_name) + 1;
321
322 if (write(output_fd, dent->d_name, size) != size ||
323 copy_event_system(sys, tps) < 0) {
324 err = -EIO;
325 free(sys);
326 goto out;
327 }
328 }
329 free(sys);
330 }
331 err = 0;
332out:
333 closedir(dir);
334 put_tracing_file(path);
335
336 return err;
337}
338
339static int record_proc_kallsyms(void)
340{
341 unsigned long long size = 0;
342 /*
343 * Just to keep older perf.data file parsers happy, record a zero
344 * sized kallsyms file, i.e. do the same thing that was done when
345 * /proc/kallsyms (or something specified via --kallsyms, in a
346 * different path) couldn't be read.
347 */
348 return write(output_fd, &size, 4) != 4 ? -EIO : 0;
349}
350
351static int record_ftrace_printk(void)
352{
353 unsigned int size;
354 char *path;
355 struct stat st;
356 int ret, err = 0;
357
358 path = get_tracing_file("printk_formats");
359 if (!path) {
360 pr_debug("can't get tracing/printk_formats");
361 return -ENOMEM;
362 }
363
364 ret = stat(path, &st);
365 if (ret < 0) {
366 /* not found */
367 size = 0;
368 if (write(output_fd, &size, 4) != 4)
369 err = -EIO;
370 goto out;
371 }
372 err = record_file(path, 4);
373
374out:
375 put_tracing_file(path);
376 return err;
377}
378
379static int record_saved_cmdline(void)
380{
381 unsigned int size;
382 char *path;
383 struct stat st;
384 int ret, err = 0;
385
386 path = get_tracing_file("saved_cmdlines");
387 if (!path) {
388 pr_debug("can't get tracing/saved_cmdline");
389 return -ENOMEM;
390 }
391
392 ret = stat(path, &st);
393 if (ret < 0) {
394 /* not found */
395 size = 0;
396 if (write(output_fd, &size, 8) != 8)
397 err = -EIO;
398 goto out;
399 }
400 err = record_file(path, 8);
401
402out:
403 put_tracing_file(path);
404 return err;
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 zfree(&t->name);
415 zfree(&t->system);
416 free(t);
417 }
418}
419
420static struct tracepoint_path *
421get_tracepoints_path(struct list_head *pattrs)
422{
423 struct tracepoint_path path, *ppath = &path;
424 struct perf_evsel *pos;
425 int nr_tracepoints = 0;
426
427 list_for_each_entry(pos, pattrs, node) {
428 if (pos->attr.type != PERF_TYPE_TRACEPOINT)
429 continue;
430 ++nr_tracepoints;
431
432 if (pos->name) {
433 ppath->next = tracepoint_name_to_path(pos->name);
434 if (ppath->next)
435 goto next;
436
437 if (strchr(pos->name, ':') == NULL)
438 goto try_id;
439
440 goto error;
441 }
442
443try_id:
444 ppath->next = tracepoint_id_to_path(pos->attr.config);
445 if (!ppath->next) {
446error:
447 pr_debug("No memory to alloc tracepoints list\n");
448 put_tracepoints_path(&path);
449 return NULL;
450 }
451next:
452 ppath = ppath->next;
453 }
454
455 return nr_tracepoints > 0 ? path.next : NULL;
456}
457
458bool have_tracepoints(struct list_head *pattrs)
459{
460 struct perf_evsel *pos;
461
462 list_for_each_entry(pos, pattrs, node)
463 if (pos->attr.type == PERF_TYPE_TRACEPOINT)
464 return true;
465
466 return false;
467}
468
469static int tracing_data_header(void)
470{
471 char buf[20];
472 ssize_t size;
473
474 /* just guessing this is someone's birthday.. ;) */
475 buf[0] = 23;
476 buf[1] = 8;
477 buf[2] = 68;
478 memcpy(buf + 3, "tracing", 7);
479
480 if (write(output_fd, buf, 10) != 10)
481 return -1;
482
483 size = strlen(VERSION) + 1;
484 if (write(output_fd, VERSION, size) != size)
485 return -1;
486
487 /* save endian */
488 if (bigendian())
489 buf[0] = 1;
490 else
491 buf[0] = 0;
492
493 if (write(output_fd, buf, 1) != 1)
494 return -1;
495
496 /* save size of long */
497 buf[0] = sizeof(long);
498 if (write(output_fd, buf, 1) != 1)
499 return -1;
500
501 /* save page_size */
502 if (write(output_fd, &page_size, 4) != 4)
503 return -1;
504
505 return 0;
506}
507
508struct tracing_data *tracing_data_get(struct list_head *pattrs,
509 int fd, bool temp)
510{
511 struct tracepoint_path *tps;
512 struct tracing_data *tdata;
513 int err;
514
515 output_fd = fd;
516
517 tps = get_tracepoints_path(pattrs);
518 if (!tps)
519 return NULL;
520
521 tdata = malloc(sizeof(*tdata));
522 if (!tdata)
523 return NULL;
524
525 tdata->temp = temp;
526 tdata->size = 0;
527
528 if (temp) {
529 int temp_fd;
530
531 snprintf(tdata->temp_file, sizeof(tdata->temp_file),
532 "/tmp/perf-XXXXXX");
533 if (!mkstemp(tdata->temp_file)) {
534 pr_debug("Can't make temp file");
535 return NULL;
536 }
537
538 temp_fd = open(tdata->temp_file, O_RDWR);
539 if (temp_fd < 0) {
540 pr_debug("Can't read '%s'", tdata->temp_file);
541 return NULL;
542 }
543
544 /*
545 * Set the temp file the default output, so all the
546 * tracing data are stored into it.
547 */
548 output_fd = temp_fd;
549 }
550
551 err = tracing_data_header();
552 if (err)
553 goto out;
554 err = record_header_files();
555 if (err)
556 goto out;
557 err = record_ftrace_files(tps);
558 if (err)
559 goto out;
560 err = record_event_files(tps);
561 if (err)
562 goto out;
563 err = record_proc_kallsyms();
564 if (err)
565 goto out;
566 err = record_ftrace_printk();
567 if (err)
568 goto out;
569 err = record_saved_cmdline();
570
571out:
572 /*
573 * All tracing data are stored by now, we can restore
574 * the default output file in case we used temp file.
575 */
576 if (temp) {
577 tdata->size = lseek(output_fd, 0, SEEK_CUR);
578 close(output_fd);
579 output_fd = fd;
580 }
581
582 if (err)
583 zfree(&tdata);
584
585 put_tracepoints_path(tps);
586 return tdata;
587}
588
589int tracing_data_put(struct tracing_data *tdata)
590{
591 int err = 0;
592
593 if (tdata->temp) {
594 err = record_file(tdata->temp_file, 0);
595 unlink(tdata->temp_file);
596 }
597
598 free(tdata);
599 return err;
600}
601
602int read_tracing_data(int fd, struct list_head *pattrs)
603{
604 int err;
605 struct tracing_data *tdata;
606
607 /*
608 * We work over the real file, so we can write data
609 * directly, no temp file is needed.
610 */
611 tdata = tracing_data_get(pattrs, fd, false);
612 if (!tdata)
613 return -ENOMEM;
614
615 err = tracing_data_put(tdata);
616 return err;
617}