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1// SPDX-License-Identifier: GPL-2.0
2#include <linux/compiler.h>
3#include <linux/kernel.h>
4#include <linux/string.h>
5#include <linux/zalloc.h>
6#include <linux/err.h>
7#include <sys/types.h>
8#include <sys/stat.h>
9#include <errno.h>
10#include <fcntl.h>
11#include <unistd.h>
12#include <string.h>
13#include <asm/bug.h>
14#include <dirent.h>
15
16#include "data.h"
17#include "util.h" // rm_rf_perf_data()
18#include "debug.h"
19#include "header.h"
20#include <internal/lib.h>
21
22static void close_dir(struct perf_data_file *files, int nr)
23{
24 while (--nr >= 0) {
25 close(files[nr].fd);
26 zfree(&files[nr].path);
27 }
28 free(files);
29}
30
31void perf_data__close_dir(struct perf_data *data)
32{
33 close_dir(data->dir.files, data->dir.nr);
34}
35
36int perf_data__create_dir(struct perf_data *data, int nr)
37{
38 struct perf_data_file *files = NULL;
39 int i, ret;
40
41 if (WARN_ON(!data->is_dir))
42 return -EINVAL;
43
44 files = zalloc(nr * sizeof(*files));
45 if (!files)
46 return -ENOMEM;
47
48 for (i = 0; i < nr; i++) {
49 struct perf_data_file *file = &files[i];
50
51 ret = asprintf(&file->path, "%s/data.%d", data->path, i);
52 if (ret < 0) {
53 ret = -ENOMEM;
54 goto out_err;
55 }
56
57 ret = open(file->path, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR);
58 if (ret < 0) {
59 ret = -errno;
60 goto out_err;
61 }
62
63 file->fd = ret;
64 }
65
66 data->dir.version = PERF_DIR_VERSION;
67 data->dir.files = files;
68 data->dir.nr = nr;
69 return 0;
70
71out_err:
72 close_dir(files, i);
73 return ret;
74}
75
76int perf_data__open_dir(struct perf_data *data)
77{
78 struct perf_data_file *files = NULL;
79 struct dirent *dent;
80 int ret = -1;
81 DIR *dir;
82 int nr = 0;
83
84 /*
85 * Directory containing a single regular perf data file which is already
86 * open, means there is nothing more to do here.
87 */
88 if (perf_data__is_single_file(data))
89 return 0;
90
91 if (WARN_ON(!data->is_dir))
92 return -EINVAL;
93
94 /* The version is provided by DIR_FORMAT feature. */
95 if (WARN_ON(data->dir.version != PERF_DIR_VERSION))
96 return -1;
97
98 dir = opendir(data->path);
99 if (!dir)
100 return -EINVAL;
101
102 while ((dent = readdir(dir)) != NULL) {
103 struct perf_data_file *file;
104 char path[PATH_MAX];
105 struct stat st;
106
107 snprintf(path, sizeof(path), "%s/%s", data->path, dent->d_name);
108 if (stat(path, &st))
109 continue;
110
111 if (!S_ISREG(st.st_mode) || strncmp(dent->d_name, "data.", 5))
112 continue;
113
114 ret = -ENOMEM;
115
116 file = realloc(files, (nr + 1) * sizeof(*files));
117 if (!file)
118 goto out_err;
119
120 files = file;
121 file = &files[nr++];
122
123 file->path = strdup(path);
124 if (!file->path)
125 goto out_err;
126
127 ret = open(file->path, O_RDONLY);
128 if (ret < 0)
129 goto out_err;
130
131 file->fd = ret;
132 file->size = st.st_size;
133 }
134
135 closedir(dir);
136 if (!files)
137 return -EINVAL;
138
139 data->dir.files = files;
140 data->dir.nr = nr;
141 return 0;
142
143out_err:
144 closedir(dir);
145 close_dir(files, nr);
146 return ret;
147}
148
149int perf_data__update_dir(struct perf_data *data)
150{
151 int i;
152
153 if (WARN_ON(!data->is_dir))
154 return -EINVAL;
155
156 for (i = 0; i < data->dir.nr; i++) {
157 struct perf_data_file *file = &data->dir.files[i];
158 struct stat st;
159
160 if (fstat(file->fd, &st))
161 return -1;
162
163 file->size = st.st_size;
164 }
165
166 return 0;
167}
168
169static bool check_pipe(struct perf_data *data)
170{
171 struct stat st;
172 bool is_pipe = false;
173 int fd = perf_data__is_read(data) ?
174 STDIN_FILENO : STDOUT_FILENO;
175
176 if (!data->path) {
177 if (!fstat(fd, &st) && S_ISFIFO(st.st_mode))
178 is_pipe = true;
179 } else {
180 if (!strcmp(data->path, "-"))
181 is_pipe = true;
182 }
183
184 if (is_pipe) {
185 if (data->use_stdio) {
186 const char *mode;
187
188 mode = perf_data__is_read(data) ? "r" : "w";
189 data->file.fptr = fdopen(fd, mode);
190
191 if (data->file.fptr == NULL) {
192 data->file.fd = fd;
193 data->use_stdio = false;
194 }
195 } else {
196 data->file.fd = fd;
197 }
198 }
199
200 return data->is_pipe = is_pipe;
201}
202
203static int check_backup(struct perf_data *data)
204{
205 struct stat st;
206
207 if (perf_data__is_read(data))
208 return 0;
209
210 if (!stat(data->path, &st) && st.st_size) {
211 char oldname[PATH_MAX];
212 int ret;
213
214 snprintf(oldname, sizeof(oldname), "%s.old",
215 data->path);
216
217 ret = rm_rf_perf_data(oldname);
218 if (ret) {
219 pr_err("Can't remove old data: %s (%s)\n",
220 ret == -2 ?
221 "Unknown file found" : strerror(errno),
222 oldname);
223 return -1;
224 }
225
226 if (rename(data->path, oldname)) {
227 pr_err("Can't move data: %s (%s to %s)\n",
228 strerror(errno),
229 data->path, oldname);
230 return -1;
231 }
232 }
233
234 return 0;
235}
236
237static bool is_dir(struct perf_data *data)
238{
239 struct stat st;
240
241 if (stat(data->path, &st))
242 return false;
243
244 return (st.st_mode & S_IFMT) == S_IFDIR;
245}
246
247static int open_file_read(struct perf_data *data)
248{
249 int flags = data->in_place_update ? O_RDWR : O_RDONLY;
250 struct stat st;
251 int fd;
252 char sbuf[STRERR_BUFSIZE];
253
254 fd = open(data->file.path, flags);
255 if (fd < 0) {
256 int err = errno;
257
258 pr_err("failed to open %s: %s", data->file.path,
259 str_error_r(err, sbuf, sizeof(sbuf)));
260 if (err == ENOENT && !strcmp(data->file.path, "perf.data"))
261 pr_err(" (try 'perf record' first)");
262 pr_err("\n");
263 return -err;
264 }
265
266 if (fstat(fd, &st) < 0)
267 goto out_close;
268
269 if (!data->force && st.st_uid && (st.st_uid != geteuid())) {
270 pr_err("File %s not owned by current user or root (use -f to override)\n",
271 data->file.path);
272 goto out_close;
273 }
274
275 if (!st.st_size) {
276 pr_info("zero-sized data (%s), nothing to do!\n",
277 data->file.path);
278 goto out_close;
279 }
280
281 data->file.size = st.st_size;
282 return fd;
283
284 out_close:
285 close(fd);
286 return -1;
287}
288
289static int open_file_write(struct perf_data *data)
290{
291 int fd;
292 char sbuf[STRERR_BUFSIZE];
293
294 fd = open(data->file.path, O_CREAT|O_RDWR|O_TRUNC|O_CLOEXEC,
295 S_IRUSR|S_IWUSR);
296
297 if (fd < 0)
298 pr_err("failed to open %s : %s\n", data->file.path,
299 str_error_r(errno, sbuf, sizeof(sbuf)));
300
301 return fd;
302}
303
304static int open_file(struct perf_data *data)
305{
306 int fd;
307
308 fd = perf_data__is_read(data) ?
309 open_file_read(data) : open_file_write(data);
310
311 if (fd < 0) {
312 zfree(&data->file.path);
313 return -1;
314 }
315
316 data->file.fd = fd;
317 return 0;
318}
319
320static int open_file_dup(struct perf_data *data)
321{
322 data->file.path = strdup(data->path);
323 if (!data->file.path)
324 return -ENOMEM;
325
326 return open_file(data);
327}
328
329static int open_dir(struct perf_data *data)
330{
331 int ret;
332
333 /*
334 * So far we open only the header, so we can read the data version and
335 * layout.
336 */
337 if (asprintf(&data->file.path, "%s/data", data->path) < 0)
338 return -1;
339
340 if (perf_data__is_write(data) &&
341 mkdir(data->path, S_IRWXU) < 0)
342 return -1;
343
344 ret = open_file(data);
345
346 /* Cleanup whatever we managed to create so far. */
347 if (ret && perf_data__is_write(data))
348 rm_rf_perf_data(data->path);
349
350 return ret;
351}
352
353int perf_data__open(struct perf_data *data)
354{
355 if (check_pipe(data))
356 return 0;
357
358 /* currently it allows stdio for pipe only */
359 data->use_stdio = false;
360
361 if (!data->path)
362 data->path = "perf.data";
363
364 if (check_backup(data))
365 return -1;
366
367 if (perf_data__is_read(data))
368 data->is_dir = is_dir(data);
369
370 return perf_data__is_dir(data) ?
371 open_dir(data) : open_file_dup(data);
372}
373
374void perf_data__close(struct perf_data *data)
375{
376 if (perf_data__is_dir(data))
377 perf_data__close_dir(data);
378
379 zfree(&data->file.path);
380
381 if (data->use_stdio)
382 fclose(data->file.fptr);
383 else
384 close(data->file.fd);
385}
386
387ssize_t perf_data__read(struct perf_data *data, void *buf, size_t size)
388{
389 if (data->use_stdio) {
390 if (fread(buf, size, 1, data->file.fptr) == 1)
391 return size;
392 return feof(data->file.fptr) ? 0 : -1;
393 }
394 return readn(data->file.fd, buf, size);
395}
396
397ssize_t perf_data_file__write(struct perf_data_file *file,
398 void *buf, size_t size)
399{
400 return writen(file->fd, buf, size);
401}
402
403ssize_t perf_data__write(struct perf_data *data,
404 void *buf, size_t size)
405{
406 if (data->use_stdio) {
407 if (fwrite(buf, size, 1, data->file.fptr) == 1)
408 return size;
409 return -1;
410 }
411 return perf_data_file__write(&data->file, buf, size);
412}
413
414int perf_data__switch(struct perf_data *data,
415 const char *postfix,
416 size_t pos, bool at_exit,
417 char **new_filepath)
418{
419 int ret;
420
421 if (check_pipe(data))
422 return -EINVAL;
423 if (perf_data__is_read(data))
424 return -EINVAL;
425
426 if (asprintf(new_filepath, "%s.%s", data->path, postfix) < 0)
427 return -ENOMEM;
428
429 /*
430 * Only fire a warning, don't return error, continue fill
431 * original file.
432 */
433 if (rename(data->path, *new_filepath))
434 pr_warning("Failed to rename %s to %s\n", data->path, *new_filepath);
435
436 if (!at_exit) {
437 close(data->file.fd);
438 ret = perf_data__open(data);
439 if (ret < 0)
440 goto out;
441
442 if (lseek(data->file.fd, pos, SEEK_SET) == (off_t)-1) {
443 ret = -errno;
444 pr_debug("Failed to lseek to %zu: %s",
445 pos, strerror(errno));
446 goto out;
447 }
448 }
449 ret = data->file.fd;
450out:
451 return ret;
452}
453
454unsigned long perf_data__size(struct perf_data *data)
455{
456 u64 size = data->file.size;
457 int i;
458
459 if (perf_data__is_single_file(data))
460 return size;
461
462 for (i = 0; i < data->dir.nr; i++) {
463 struct perf_data_file *file = &data->dir.files[i];
464
465 size += file->size;
466 }
467
468 return size;
469}
470
471int perf_data__make_kcore_dir(struct perf_data *data, char *buf, size_t buf_sz)
472{
473 int ret;
474
475 if (!data->is_dir)
476 return -1;
477
478 ret = snprintf(buf, buf_sz, "%s/kcore_dir", data->path);
479 if (ret < 0 || (size_t)ret >= buf_sz)
480 return -1;
481
482 return mkdir(buf, S_IRWXU);
483}
484
485bool has_kcore_dir(const char *path)
486{
487 struct dirent *d = ERR_PTR(-EINVAL);
488 const char *name = "kcore_dir";
489 DIR *dir = opendir(path);
490 size_t n = strlen(name);
491 bool result = false;
492
493 if (dir) {
494 while (d && !result) {
495 d = readdir(dir);
496 result = d ? strncmp(d->d_name, name, n) : false;
497 }
498 closedir(dir);
499 }
500
501 return result;
502}
503
504char *perf_data__kallsyms_name(struct perf_data *data)
505{
506 char *kallsyms_name;
507 struct stat st;
508
509 if (!data->is_dir)
510 return NULL;
511
512 if (asprintf(&kallsyms_name, "%s/kcore_dir/kallsyms", data->path) < 0)
513 return NULL;
514
515 if (stat(kallsyms_name, &st)) {
516 free(kallsyms_name);
517 return NULL;
518 }
519
520 return kallsyms_name;
521}
522
523char *perf_data__guest_kallsyms_name(struct perf_data *data, pid_t machine_pid)
524{
525 char *kallsyms_name;
526 struct stat st;
527
528 if (!data->is_dir)
529 return NULL;
530
531 if (asprintf(&kallsyms_name, "%s/kcore_dir__%d/kallsyms", data->path, machine_pid) < 0)
532 return NULL;
533
534 if (stat(kallsyms_name, &st)) {
535 free(kallsyms_name);
536 return NULL;
537 }
538
539 return kallsyms_name;
540}
541
542bool is_perf_data(const char *path)
543{
544 bool ret = false;
545 FILE *file;
546 u64 magic;
547
548 file = fopen(path, "r");
549 if (!file)
550 return false;
551
552 if (fread(&magic, 1, 8, file) < 8)
553 goto out;
554
555 ret = is_perf_magic(magic);
556out:
557 fclose(file);
558 return ret;
559}
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/compiler.h>
3#include <linux/kernel.h>
4#include <linux/string.h>
5#include <linux/zalloc.h>
6#include <linux/err.h>
7#include <sys/types.h>
8#include <sys/stat.h>
9#include <errno.h>
10#include <fcntl.h>
11#include <unistd.h>
12#include <string.h>
13#include <asm/bug.h>
14#include <dirent.h>
15
16#include "data.h"
17#include "util.h" // rm_rf_perf_data()
18#include "debug.h"
19#include "header.h"
20#include "rlimit.h"
21#include <internal/lib.h>
22
23static void close_dir(struct perf_data_file *files, int nr)
24{
25 while (--nr >= 0) {
26 close(files[nr].fd);
27 zfree(&files[nr].path);
28 }
29 free(files);
30}
31
32void perf_data__close_dir(struct perf_data *data)
33{
34 close_dir(data->dir.files, data->dir.nr);
35}
36
37int perf_data__create_dir(struct perf_data *data, int nr)
38{
39 enum rlimit_action set_rlimit = NO_CHANGE;
40 struct perf_data_file *files = NULL;
41 int i, ret;
42
43 if (WARN_ON(!data->is_dir))
44 return -EINVAL;
45
46 files = zalloc(nr * sizeof(*files));
47 if (!files)
48 return -ENOMEM;
49
50 for (i = 0; i < nr; i++) {
51 struct perf_data_file *file = &files[i];
52
53 ret = asprintf(&file->path, "%s/data.%d", data->path, i);
54 if (ret < 0) {
55 ret = -ENOMEM;
56 goto out_err;
57 }
58
59retry_open:
60 ret = open(file->path, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR);
61 if (ret < 0) {
62 /*
63 * If using parallel threads to collect data,
64 * perf record needs at least 6 fds per CPU.
65 * When we run out of them try to increase the limits.
66 */
67 if (errno == EMFILE && rlimit__increase_nofile(&set_rlimit))
68 goto retry_open;
69
70 ret = -errno;
71 goto out_err;
72 }
73 set_rlimit = NO_CHANGE;
74
75 file->fd = ret;
76 }
77
78 data->dir.version = PERF_DIR_VERSION;
79 data->dir.files = files;
80 data->dir.nr = nr;
81 return 0;
82
83out_err:
84 close_dir(files, i);
85 return ret;
86}
87
88int perf_data__open_dir(struct perf_data *data)
89{
90 struct perf_data_file *files = NULL;
91 struct dirent *dent;
92 int ret = -1;
93 DIR *dir;
94 int nr = 0;
95
96 /*
97 * Directory containing a single regular perf data file which is already
98 * open, means there is nothing more to do here.
99 */
100 if (perf_data__is_single_file(data))
101 return 0;
102
103 if (WARN_ON(!data->is_dir))
104 return -EINVAL;
105
106 /* The version is provided by DIR_FORMAT feature. */
107 if (WARN_ON(data->dir.version != PERF_DIR_VERSION))
108 return -1;
109
110 dir = opendir(data->path);
111 if (!dir)
112 return -EINVAL;
113
114 while ((dent = readdir(dir)) != NULL) {
115 struct perf_data_file *file;
116 char path[PATH_MAX];
117 struct stat st;
118
119 snprintf(path, sizeof(path), "%s/%s", data->path, dent->d_name);
120 if (stat(path, &st))
121 continue;
122
123 if (!S_ISREG(st.st_mode) || strncmp(dent->d_name, "data.", 5))
124 continue;
125
126 ret = -ENOMEM;
127
128 file = realloc(files, (nr + 1) * sizeof(*files));
129 if (!file)
130 goto out_err;
131
132 files = file;
133 file = &files[nr++];
134
135 file->path = strdup(path);
136 if (!file->path)
137 goto out_err;
138
139 ret = open(file->path, O_RDONLY);
140 if (ret < 0)
141 goto out_err;
142
143 file->fd = ret;
144 file->size = st.st_size;
145 }
146
147 closedir(dir);
148 if (!files)
149 return -EINVAL;
150
151 data->dir.files = files;
152 data->dir.nr = nr;
153 return 0;
154
155out_err:
156 closedir(dir);
157 close_dir(files, nr);
158 return ret;
159}
160
161int perf_data__update_dir(struct perf_data *data)
162{
163 int i;
164
165 if (WARN_ON(!data->is_dir))
166 return -EINVAL;
167
168 for (i = 0; i < data->dir.nr; i++) {
169 struct perf_data_file *file = &data->dir.files[i];
170 struct stat st;
171
172 if (fstat(file->fd, &st))
173 return -1;
174
175 file->size = st.st_size;
176 }
177
178 return 0;
179}
180
181static bool check_pipe(struct perf_data *data)
182{
183 struct stat st;
184 bool is_pipe = false;
185 int fd = perf_data__is_read(data) ?
186 STDIN_FILENO : STDOUT_FILENO;
187
188 if (!data->path) {
189 if (!fstat(fd, &st) && S_ISFIFO(st.st_mode))
190 is_pipe = true;
191 } else {
192 if (!strcmp(data->path, "-"))
193 is_pipe = true;
194 }
195
196 if (is_pipe) {
197 if (data->use_stdio) {
198 const char *mode;
199
200 mode = perf_data__is_read(data) ? "r" : "w";
201 data->file.fptr = fdopen(fd, mode);
202
203 if (data->file.fptr == NULL) {
204 data->file.fd = fd;
205 data->use_stdio = false;
206 }
207
208 /*
209 * When is_pipe and data->file.fd is given, use given fd
210 * instead of STDIN_FILENO or STDOUT_FILENO
211 */
212 } else if (data->file.fd <= 0) {
213 data->file.fd = fd;
214 }
215 }
216
217 return data->is_pipe = is_pipe;
218}
219
220static int check_backup(struct perf_data *data)
221{
222 struct stat st;
223
224 if (perf_data__is_read(data))
225 return 0;
226
227 if (!stat(data->path, &st) && st.st_size) {
228 char oldname[PATH_MAX];
229 int ret;
230
231 snprintf(oldname, sizeof(oldname), "%s.old",
232 data->path);
233
234 ret = rm_rf_perf_data(oldname);
235 if (ret) {
236 pr_err("Can't remove old data: %s (%s)\n",
237 ret == -2 ?
238 "Unknown file found" : strerror(errno),
239 oldname);
240 return -1;
241 }
242
243 if (rename(data->path, oldname)) {
244 pr_err("Can't move data: %s (%s to %s)\n",
245 strerror(errno),
246 data->path, oldname);
247 return -1;
248 }
249 }
250
251 return 0;
252}
253
254static bool is_dir(struct perf_data *data)
255{
256 struct stat st;
257
258 if (stat(data->path, &st))
259 return false;
260
261 return (st.st_mode & S_IFMT) == S_IFDIR;
262}
263
264static int open_file_read(struct perf_data *data)
265{
266 int flags = data->in_place_update ? O_RDWR : O_RDONLY;
267 struct stat st;
268 int fd;
269 char sbuf[STRERR_BUFSIZE];
270
271 fd = open(data->file.path, flags);
272 if (fd < 0) {
273 int err = errno;
274
275 pr_err("failed to open %s: %s", data->file.path,
276 str_error_r(err, sbuf, sizeof(sbuf)));
277 if (err == ENOENT && !strcmp(data->file.path, "perf.data"))
278 pr_err(" (try 'perf record' first)");
279 pr_err("\n");
280 return -err;
281 }
282
283 if (fstat(fd, &st) < 0)
284 goto out_close;
285
286 if (!data->force && st.st_uid && (st.st_uid != geteuid())) {
287 pr_err("File %s not owned by current user or root (use -f to override)\n",
288 data->file.path);
289 goto out_close;
290 }
291
292 if (!st.st_size) {
293 pr_info("zero-sized data (%s), nothing to do!\n",
294 data->file.path);
295 goto out_close;
296 }
297
298 data->file.size = st.st_size;
299 return fd;
300
301 out_close:
302 close(fd);
303 return -1;
304}
305
306static int open_file_write(struct perf_data *data)
307{
308 int fd;
309 char sbuf[STRERR_BUFSIZE];
310
311 fd = open(data->file.path, O_CREAT|O_RDWR|O_TRUNC|O_CLOEXEC,
312 S_IRUSR|S_IWUSR);
313
314 if (fd < 0)
315 pr_err("failed to open %s : %s\n", data->file.path,
316 str_error_r(errno, sbuf, sizeof(sbuf)));
317
318 return fd;
319}
320
321static int open_file(struct perf_data *data)
322{
323 int fd;
324
325 fd = perf_data__is_read(data) ?
326 open_file_read(data) : open_file_write(data);
327
328 if (fd < 0) {
329 zfree(&data->file.path);
330 return -1;
331 }
332
333 data->file.fd = fd;
334 return 0;
335}
336
337static int open_file_dup(struct perf_data *data)
338{
339 data->file.path = strdup(data->path);
340 if (!data->file.path)
341 return -ENOMEM;
342
343 return open_file(data);
344}
345
346static int open_dir(struct perf_data *data)
347{
348 int ret;
349
350 /*
351 * So far we open only the header, so we can read the data version and
352 * layout.
353 */
354 if (asprintf(&data->file.path, "%s/data", data->path) < 0)
355 return -1;
356
357 if (perf_data__is_write(data) &&
358 mkdir(data->path, S_IRWXU) < 0)
359 return -1;
360
361 ret = open_file(data);
362
363 /* Cleanup whatever we managed to create so far. */
364 if (ret && perf_data__is_write(data))
365 rm_rf_perf_data(data->path);
366
367 return ret;
368}
369
370int perf_data__open(struct perf_data *data)
371{
372 if (check_pipe(data))
373 return 0;
374
375 /* currently it allows stdio for pipe only */
376 data->use_stdio = false;
377
378 if (!data->path)
379 data->path = "perf.data";
380
381 if (check_backup(data))
382 return -1;
383
384 if (perf_data__is_read(data))
385 data->is_dir = is_dir(data);
386
387 return perf_data__is_dir(data) ?
388 open_dir(data) : open_file_dup(data);
389}
390
391void perf_data__close(struct perf_data *data)
392{
393 if (perf_data__is_dir(data))
394 perf_data__close_dir(data);
395
396 zfree(&data->file.path);
397
398 if (data->use_stdio)
399 fclose(data->file.fptr);
400 else
401 close(data->file.fd);
402}
403
404ssize_t perf_data__read(struct perf_data *data, void *buf, size_t size)
405{
406 if (data->use_stdio) {
407 if (fread(buf, size, 1, data->file.fptr) == 1)
408 return size;
409 return feof(data->file.fptr) ? 0 : -1;
410 }
411 return readn(data->file.fd, buf, size);
412}
413
414ssize_t perf_data_file__write(struct perf_data_file *file,
415 void *buf, size_t size)
416{
417 return writen(file->fd, buf, size);
418}
419
420ssize_t perf_data__write(struct perf_data *data,
421 void *buf, size_t size)
422{
423 if (data->use_stdio) {
424 if (fwrite(buf, size, 1, data->file.fptr) == 1)
425 return size;
426 return -1;
427 }
428 return perf_data_file__write(&data->file, buf, size);
429}
430
431int perf_data__switch(struct perf_data *data,
432 const char *postfix,
433 size_t pos, bool at_exit,
434 char **new_filepath)
435{
436 int ret;
437
438 if (perf_data__is_read(data))
439 return -EINVAL;
440
441 if (asprintf(new_filepath, "%s.%s", data->path, postfix) < 0)
442 return -ENOMEM;
443
444 /*
445 * Only fire a warning, don't return error, continue fill
446 * original file.
447 */
448 if (rename(data->path, *new_filepath))
449 pr_warning("Failed to rename %s to %s\n", data->path, *new_filepath);
450
451 if (!at_exit) {
452 close(data->file.fd);
453 ret = perf_data__open(data);
454 if (ret < 0)
455 goto out;
456
457 if (lseek(data->file.fd, pos, SEEK_SET) == (off_t)-1) {
458 ret = -errno;
459 pr_debug("Failed to lseek to %zu: %s",
460 pos, strerror(errno));
461 goto out;
462 }
463 }
464 ret = data->file.fd;
465out:
466 return ret;
467}
468
469unsigned long perf_data__size(struct perf_data *data)
470{
471 u64 size = data->file.size;
472 int i;
473
474 if (perf_data__is_single_file(data))
475 return size;
476
477 for (i = 0; i < data->dir.nr; i++) {
478 struct perf_data_file *file = &data->dir.files[i];
479
480 size += file->size;
481 }
482
483 return size;
484}
485
486int perf_data__make_kcore_dir(struct perf_data *data, char *buf, size_t buf_sz)
487{
488 int ret;
489
490 if (!data->is_dir)
491 return -1;
492
493 ret = snprintf(buf, buf_sz, "%s/kcore_dir", data->path);
494 if (ret < 0 || (size_t)ret >= buf_sz)
495 return -1;
496
497 return mkdir(buf, S_IRWXU);
498}
499
500bool has_kcore_dir(const char *path)
501{
502 struct dirent *d = ERR_PTR(-EINVAL);
503 const char *name = "kcore_dir";
504 DIR *dir = opendir(path);
505 size_t n = strlen(name);
506 bool result = false;
507
508 if (dir) {
509 while (d && !result) {
510 d = readdir(dir);
511 result = d ? strncmp(d->d_name, name, n) : false;
512 }
513 closedir(dir);
514 }
515
516 return result;
517}
518
519char *perf_data__kallsyms_name(struct perf_data *data)
520{
521 char *kallsyms_name;
522 struct stat st;
523
524 if (!data->is_dir)
525 return NULL;
526
527 if (asprintf(&kallsyms_name, "%s/kcore_dir/kallsyms", data->path) < 0)
528 return NULL;
529
530 if (stat(kallsyms_name, &st)) {
531 free(kallsyms_name);
532 return NULL;
533 }
534
535 return kallsyms_name;
536}
537
538char *perf_data__guest_kallsyms_name(struct perf_data *data, pid_t machine_pid)
539{
540 char *kallsyms_name;
541 struct stat st;
542
543 if (!data->is_dir)
544 return NULL;
545
546 if (asprintf(&kallsyms_name, "%s/kcore_dir__%d/kallsyms", data->path, machine_pid) < 0)
547 return NULL;
548
549 if (stat(kallsyms_name, &st)) {
550 free(kallsyms_name);
551 return NULL;
552 }
553
554 return kallsyms_name;
555}
556
557bool is_perf_data(const char *path)
558{
559 bool ret = false;
560 FILE *file;
561 u64 magic;
562
563 file = fopen(path, "r");
564 if (!file)
565 return false;
566
567 if (fread(&magic, 1, 8, file) < 8)
568 goto out;
569
570 ret = is_perf_magic(magic);
571out:
572 fclose(file);
573 return ret;
574}