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1// SPDX-License-Identifier: GPL-2.0
2#include "util.h"
3#include "debug.h"
4#include "event.h"
5#include <api/fs/fs.h>
6#include <sys/stat.h>
7#include <sys/utsname.h>
8#include <dirent.h>
9#include <fcntl.h>
10#include <inttypes.h>
11#include <signal.h>
12#include <stdio.h>
13#include <stdlib.h>
14#include <string.h>
15#include <errno.h>
16#include <limits.h>
17#include <linux/capability.h>
18#include <linux/kernel.h>
19#include <linux/log2.h>
20#include <linux/time64.h>
21#include <unistd.h>
22#include "cap.h"
23#include "strlist.h"
24#include "string2.h"
25
26/*
27 * XXX We need to find a better place for these things...
28 */
29
30bool perf_singlethreaded = true;
31
32void perf_set_singlethreaded(void)
33{
34 perf_singlethreaded = true;
35}
36
37void perf_set_multithreaded(void)
38{
39 perf_singlethreaded = false;
40}
41
42int sysctl_perf_event_max_stack = PERF_MAX_STACK_DEPTH;
43int sysctl_perf_event_max_contexts_per_stack = PERF_MAX_CONTEXTS_PER_STACK;
44
45int sysctl__max_stack(void)
46{
47 int value;
48
49 if (sysctl__read_int("kernel/perf_event_max_stack", &value) == 0)
50 sysctl_perf_event_max_stack = value;
51
52 if (sysctl__read_int("kernel/perf_event_max_contexts_per_stack", &value) == 0)
53 sysctl_perf_event_max_contexts_per_stack = value;
54
55 return sysctl_perf_event_max_stack;
56}
57
58bool test_attr__enabled;
59
60bool perf_host = true;
61bool perf_guest = false;
62
63void event_attr_init(struct perf_event_attr *attr)
64{
65 if (!perf_host)
66 attr->exclude_host = 1;
67 if (!perf_guest)
68 attr->exclude_guest = 1;
69 /* to capture ABI version */
70 attr->size = sizeof(*attr);
71}
72
73int mkdir_p(char *path, mode_t mode)
74{
75 struct stat st;
76 int err;
77 char *d = path;
78
79 if (*d != '/')
80 return -1;
81
82 if (stat(path, &st) == 0)
83 return 0;
84
85 while (*++d == '/');
86
87 while ((d = strchr(d, '/'))) {
88 *d = '\0';
89 err = stat(path, &st) && mkdir(path, mode);
90 *d++ = '/';
91 if (err)
92 return -1;
93 while (*d == '/')
94 ++d;
95 }
96 return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0;
97}
98
99static bool match_pat(char *file, const char **pat)
100{
101 int i = 0;
102
103 if (!pat)
104 return true;
105
106 while (pat[i]) {
107 if (strglobmatch(file, pat[i]))
108 return true;
109
110 i++;
111 }
112
113 return false;
114}
115
116/*
117 * The depth specify how deep the removal will go.
118 * 0 - will remove only files under the 'path' directory
119 * 1 .. x - will dive in x-level deep under the 'path' directory
120 *
121 * If specified the pat is array of string patterns ended with NULL,
122 * which are checked upon every file/directory found. Only matching
123 * ones are removed.
124 *
125 * The function returns:
126 * 0 on success
127 * -1 on removal failure with errno set
128 * -2 on pattern failure
129 */
130static int rm_rf_depth_pat(const char *path, int depth, const char **pat)
131{
132 DIR *dir;
133 int ret;
134 struct dirent *d;
135 char namebuf[PATH_MAX];
136 struct stat statbuf;
137
138 /* Do not fail if there's no file. */
139 ret = lstat(path, &statbuf);
140 if (ret)
141 return 0;
142
143 /* Try to remove any file we get. */
144 if (!(statbuf.st_mode & S_IFDIR))
145 return unlink(path);
146
147 /* We have directory in path. */
148 dir = opendir(path);
149 if (dir == NULL)
150 return -1;
151
152 while ((d = readdir(dir)) != NULL && !ret) {
153
154 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
155 continue;
156
157 if (!match_pat(d->d_name, pat)) {
158 ret = -2;
159 break;
160 }
161
162 scnprintf(namebuf, sizeof(namebuf), "%s/%s",
163 path, d->d_name);
164
165 /* We have to check symbolic link itself */
166 ret = lstat(namebuf, &statbuf);
167 if (ret < 0) {
168 pr_debug("stat failed: %s\n", namebuf);
169 break;
170 }
171
172 if (S_ISDIR(statbuf.st_mode))
173 ret = depth ? rm_rf_depth_pat(namebuf, depth - 1, pat) : 0;
174 else
175 ret = unlink(namebuf);
176 }
177 closedir(dir);
178
179 if (ret < 0)
180 return ret;
181
182 return rmdir(path);
183}
184
185int rm_rf_perf_data(const char *path)
186{
187 const char *pat[] = {
188 "header",
189 "data.*",
190 NULL,
191 };
192
193 return rm_rf_depth_pat(path, 0, pat);
194}
195
196int rm_rf(const char *path)
197{
198 return rm_rf_depth_pat(path, INT_MAX, NULL);
199}
200
201/* A filter which removes dot files */
202bool lsdir_no_dot_filter(const char *name __maybe_unused, struct dirent *d)
203{
204 return d->d_name[0] != '.';
205}
206
207/* lsdir reads a directory and store it in strlist */
208struct strlist *lsdir(const char *name,
209 bool (*filter)(const char *, struct dirent *))
210{
211 struct strlist *list = NULL;
212 DIR *dir;
213 struct dirent *d;
214
215 dir = opendir(name);
216 if (!dir)
217 return NULL;
218
219 list = strlist__new(NULL, NULL);
220 if (!list) {
221 errno = ENOMEM;
222 goto out;
223 }
224
225 while ((d = readdir(dir)) != NULL) {
226 if (!filter || filter(name, d))
227 strlist__add(list, d->d_name);
228 }
229
230out:
231 closedir(dir);
232 return list;
233}
234
235size_t hex_width(u64 v)
236{
237 size_t n = 1;
238
239 while ((v >>= 4))
240 ++n;
241
242 return n;
243}
244
245int perf_event_paranoid(void)
246{
247 int value;
248
249 if (sysctl__read_int("kernel/perf_event_paranoid", &value))
250 return INT_MAX;
251
252 return value;
253}
254
255bool perf_event_paranoid_check(int max_level)
256{
257 return perf_cap__capable(CAP_SYS_ADMIN) ||
258 perf_event_paranoid() <= max_level;
259}
260
261static int
262fetch_ubuntu_kernel_version(unsigned int *puint)
263{
264 ssize_t len;
265 size_t line_len = 0;
266 char *ptr, *line = NULL;
267 int version, patchlevel, sublevel, err;
268 FILE *vsig;
269
270 if (!puint)
271 return 0;
272
273 vsig = fopen("/proc/version_signature", "r");
274 if (!vsig) {
275 pr_debug("Open /proc/version_signature failed: %s\n",
276 strerror(errno));
277 return -1;
278 }
279
280 len = getline(&line, &line_len, vsig);
281 fclose(vsig);
282 err = -1;
283 if (len <= 0) {
284 pr_debug("Reading from /proc/version_signature failed: %s\n",
285 strerror(errno));
286 goto errout;
287 }
288
289 ptr = strrchr(line, ' ');
290 if (!ptr) {
291 pr_debug("Parsing /proc/version_signature failed: %s\n", line);
292 goto errout;
293 }
294
295 err = sscanf(ptr + 1, "%d.%d.%d",
296 &version, &patchlevel, &sublevel);
297 if (err != 3) {
298 pr_debug("Unable to get kernel version from /proc/version_signature '%s'\n",
299 line);
300 goto errout;
301 }
302
303 *puint = (version << 16) + (patchlevel << 8) + sublevel;
304 err = 0;
305errout:
306 free(line);
307 return err;
308}
309
310int
311fetch_kernel_version(unsigned int *puint, char *str,
312 size_t str_size)
313{
314 struct utsname utsname;
315 int version, patchlevel, sublevel, err;
316 bool int_ver_ready = false;
317
318 if (access("/proc/version_signature", R_OK) == 0)
319 if (!fetch_ubuntu_kernel_version(puint))
320 int_ver_ready = true;
321
322 if (uname(&utsname))
323 return -1;
324
325 if (str && str_size) {
326 strncpy(str, utsname.release, str_size);
327 str[str_size - 1] = '\0';
328 }
329
330 if (!puint || int_ver_ready)
331 return 0;
332
333 err = sscanf(utsname.release, "%d.%d.%d",
334 &version, &patchlevel, &sublevel);
335
336 if (err != 3) {
337 pr_debug("Unable to get kernel version from uname '%s'\n",
338 utsname.release);
339 return -1;
340 }
341
342 *puint = (version << 16) + (patchlevel << 8) + sublevel;
343 return 0;
344}
345
346const char *perf_tip(const char *dirpath)
347{
348 struct strlist *tips;
349 struct str_node *node;
350 char *tip = NULL;
351 struct strlist_config conf = {
352 .dirname = dirpath,
353 .file_only = true,
354 };
355
356 tips = strlist__new("tips.txt", &conf);
357 if (tips == NULL)
358 return errno == ENOENT ? NULL :
359 "Tip: check path of tips.txt or get more memory! ;-p";
360
361 if (strlist__nr_entries(tips) == 0)
362 goto out;
363
364 node = strlist__entry(tips, random() % strlist__nr_entries(tips));
365 if (asprintf(&tip, "Tip: %s", node->s) < 0)
366 tip = (char *)"Tip: get more memory! ;-)";
367
368out:
369 strlist__delete(tips);
370
371 return tip;
372}
373
374char *perf_exe(char *buf, int len)
375{
376 int n = readlink("/proc/self/exe", buf, len);
377 if (n > 0) {
378 buf[n] = 0;
379 return buf;
380 }
381 return strcpy(buf, "perf");
382}
1#include "../perf.h"
2#include "util.h"
3#include "debug.h"
4#include <api/fs/fs.h>
5#include <sys/mman.h>
6#include <sys/utsname.h>
7#ifdef HAVE_BACKTRACE_SUPPORT
8#include <execinfo.h>
9#endif
10#include <stdio.h>
11#include <stdlib.h>
12#include <string.h>
13#include <errno.h>
14#include <limits.h>
15#include <byteswap.h>
16#include <linux/kernel.h>
17#include <linux/log2.h>
18#include <linux/time64.h>
19#include <unistd.h>
20#include "callchain.h"
21#include "strlist.h"
22
23#define CALLCHAIN_PARAM_DEFAULT \
24 .mode = CHAIN_GRAPH_ABS, \
25 .min_percent = 0.5, \
26 .order = ORDER_CALLEE, \
27 .key = CCKEY_FUNCTION, \
28 .value = CCVAL_PERCENT, \
29
30struct callchain_param callchain_param = {
31 CALLCHAIN_PARAM_DEFAULT
32};
33
34struct callchain_param callchain_param_default = {
35 CALLCHAIN_PARAM_DEFAULT
36};
37
38/*
39 * XXX We need to find a better place for these things...
40 */
41unsigned int page_size;
42int cacheline_size;
43
44int sysctl_perf_event_max_stack = PERF_MAX_STACK_DEPTH;
45int sysctl_perf_event_max_contexts_per_stack = PERF_MAX_CONTEXTS_PER_STACK;
46
47bool test_attr__enabled;
48
49bool perf_host = true;
50bool perf_guest = false;
51
52void event_attr_init(struct perf_event_attr *attr)
53{
54 if (!perf_host)
55 attr->exclude_host = 1;
56 if (!perf_guest)
57 attr->exclude_guest = 1;
58 /* to capture ABI version */
59 attr->size = sizeof(*attr);
60}
61
62int mkdir_p(char *path, mode_t mode)
63{
64 struct stat st;
65 int err;
66 char *d = path;
67
68 if (*d != '/')
69 return -1;
70
71 if (stat(path, &st) == 0)
72 return 0;
73
74 while (*++d == '/');
75
76 while ((d = strchr(d, '/'))) {
77 *d = '\0';
78 err = stat(path, &st) && mkdir(path, mode);
79 *d++ = '/';
80 if (err)
81 return -1;
82 while (*d == '/')
83 ++d;
84 }
85 return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0;
86}
87
88int rm_rf(char *path)
89{
90 DIR *dir;
91 int ret = 0;
92 struct dirent *d;
93 char namebuf[PATH_MAX];
94
95 dir = opendir(path);
96 if (dir == NULL)
97 return 0;
98
99 while ((d = readdir(dir)) != NULL && !ret) {
100 struct stat statbuf;
101
102 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
103 continue;
104
105 scnprintf(namebuf, sizeof(namebuf), "%s/%s",
106 path, d->d_name);
107
108 /* We have to check symbolic link itself */
109 ret = lstat(namebuf, &statbuf);
110 if (ret < 0) {
111 pr_debug("stat failed: %s\n", namebuf);
112 break;
113 }
114
115 if (S_ISDIR(statbuf.st_mode))
116 ret = rm_rf(namebuf);
117 else
118 ret = unlink(namebuf);
119 }
120 closedir(dir);
121
122 if (ret < 0)
123 return ret;
124
125 return rmdir(path);
126}
127
128/* A filter which removes dot files */
129bool lsdir_no_dot_filter(const char *name __maybe_unused, struct dirent *d)
130{
131 return d->d_name[0] != '.';
132}
133
134/* lsdir reads a directory and store it in strlist */
135struct strlist *lsdir(const char *name,
136 bool (*filter)(const char *, struct dirent *))
137{
138 struct strlist *list = NULL;
139 DIR *dir;
140 struct dirent *d;
141
142 dir = opendir(name);
143 if (!dir)
144 return NULL;
145
146 list = strlist__new(NULL, NULL);
147 if (!list) {
148 errno = ENOMEM;
149 goto out;
150 }
151
152 while ((d = readdir(dir)) != NULL) {
153 if (!filter || filter(name, d))
154 strlist__add(list, d->d_name);
155 }
156
157out:
158 closedir(dir);
159 return list;
160}
161
162static int slow_copyfile(const char *from, const char *to)
163{
164 int err = -1;
165 char *line = NULL;
166 size_t n;
167 FILE *from_fp = fopen(from, "r"), *to_fp;
168
169 if (from_fp == NULL)
170 goto out;
171
172 to_fp = fopen(to, "w");
173 if (to_fp == NULL)
174 goto out_fclose_from;
175
176 while (getline(&line, &n, from_fp) > 0)
177 if (fputs(line, to_fp) == EOF)
178 goto out_fclose_to;
179 err = 0;
180out_fclose_to:
181 fclose(to_fp);
182 free(line);
183out_fclose_from:
184 fclose(from_fp);
185out:
186 return err;
187}
188
189int copyfile_offset(int ifd, loff_t off_in, int ofd, loff_t off_out, u64 size)
190{
191 void *ptr;
192 loff_t pgoff;
193
194 pgoff = off_in & ~(page_size - 1);
195 off_in -= pgoff;
196
197 ptr = mmap(NULL, off_in + size, PROT_READ, MAP_PRIVATE, ifd, pgoff);
198 if (ptr == MAP_FAILED)
199 return -1;
200
201 while (size) {
202 ssize_t ret = pwrite(ofd, ptr + off_in, size, off_out);
203 if (ret < 0 && errno == EINTR)
204 continue;
205 if (ret <= 0)
206 break;
207
208 size -= ret;
209 off_in += ret;
210 off_out -= ret;
211 }
212 munmap(ptr, off_in + size);
213
214 return size ? -1 : 0;
215}
216
217int copyfile_mode(const char *from, const char *to, mode_t mode)
218{
219 int fromfd, tofd;
220 struct stat st;
221 int err = -1;
222 char *tmp = NULL, *ptr = NULL;
223
224 if (stat(from, &st))
225 goto out;
226
227 /* extra 'x' at the end is to reserve space for '.' */
228 if (asprintf(&tmp, "%s.XXXXXXx", to) < 0) {
229 tmp = NULL;
230 goto out;
231 }
232 ptr = strrchr(tmp, '/');
233 if (!ptr)
234 goto out;
235 ptr = memmove(ptr + 1, ptr, strlen(ptr) - 1);
236 *ptr = '.';
237
238 tofd = mkstemp(tmp);
239 if (tofd < 0)
240 goto out;
241
242 if (fchmod(tofd, mode))
243 goto out_close_to;
244
245 if (st.st_size == 0) { /* /proc? do it slowly... */
246 err = slow_copyfile(from, tmp);
247 goto out_close_to;
248 }
249
250 fromfd = open(from, O_RDONLY);
251 if (fromfd < 0)
252 goto out_close_to;
253
254 err = copyfile_offset(fromfd, 0, tofd, 0, st.st_size);
255
256 close(fromfd);
257out_close_to:
258 close(tofd);
259 if (!err)
260 err = link(tmp, to);
261 unlink(tmp);
262out:
263 free(tmp);
264 return err;
265}
266
267int copyfile(const char *from, const char *to)
268{
269 return copyfile_mode(from, to, 0755);
270}
271
272unsigned long convert_unit(unsigned long value, char *unit)
273{
274 *unit = ' ';
275
276 if (value > 1000) {
277 value /= 1000;
278 *unit = 'K';
279 }
280
281 if (value > 1000) {
282 value /= 1000;
283 *unit = 'M';
284 }
285
286 if (value > 1000) {
287 value /= 1000;
288 *unit = 'G';
289 }
290
291 return value;
292}
293
294static ssize_t ion(bool is_read, int fd, void *buf, size_t n)
295{
296 void *buf_start = buf;
297 size_t left = n;
298
299 while (left) {
300 ssize_t ret = is_read ? read(fd, buf, left) :
301 write(fd, buf, left);
302
303 if (ret < 0 && errno == EINTR)
304 continue;
305 if (ret <= 0)
306 return ret;
307
308 left -= ret;
309 buf += ret;
310 }
311
312 BUG_ON((size_t)(buf - buf_start) != n);
313 return n;
314}
315
316/*
317 * Read exactly 'n' bytes or return an error.
318 */
319ssize_t readn(int fd, void *buf, size_t n)
320{
321 return ion(true, fd, buf, n);
322}
323
324/*
325 * Write exactly 'n' bytes or return an error.
326 */
327ssize_t writen(int fd, void *buf, size_t n)
328{
329 return ion(false, fd, buf, n);
330}
331
332size_t hex_width(u64 v)
333{
334 size_t n = 1;
335
336 while ((v >>= 4))
337 ++n;
338
339 return n;
340}
341
342static int hex(char ch)
343{
344 if ((ch >= '0') && (ch <= '9'))
345 return ch - '0';
346 if ((ch >= 'a') && (ch <= 'f'))
347 return ch - 'a' + 10;
348 if ((ch >= 'A') && (ch <= 'F'))
349 return ch - 'A' + 10;
350 return -1;
351}
352
353/*
354 * While we find nice hex chars, build a long_val.
355 * Return number of chars processed.
356 */
357int hex2u64(const char *ptr, u64 *long_val)
358{
359 const char *p = ptr;
360 *long_val = 0;
361
362 while (*p) {
363 const int hex_val = hex(*p);
364
365 if (hex_val < 0)
366 break;
367
368 *long_val = (*long_val << 4) | hex_val;
369 p++;
370 }
371
372 return p - ptr;
373}
374
375/* Obtain a backtrace and print it to stdout. */
376#ifdef HAVE_BACKTRACE_SUPPORT
377void dump_stack(void)
378{
379 void *array[16];
380 size_t size = backtrace(array, ARRAY_SIZE(array));
381 char **strings = backtrace_symbols(array, size);
382 size_t i;
383
384 printf("Obtained %zd stack frames.\n", size);
385
386 for (i = 0; i < size; i++)
387 printf("%s\n", strings[i]);
388
389 free(strings);
390}
391#else
392void dump_stack(void) {}
393#endif
394
395void sighandler_dump_stack(int sig)
396{
397 psignal(sig, "perf");
398 dump_stack();
399 signal(sig, SIG_DFL);
400 raise(sig);
401}
402
403int timestamp__scnprintf_usec(u64 timestamp, char *buf, size_t sz)
404{
405 u64 sec = timestamp / NSEC_PER_SEC;
406 u64 usec = (timestamp % NSEC_PER_SEC) / NSEC_PER_USEC;
407
408 return scnprintf(buf, sz, "%"PRIu64".%06"PRIu64, sec, usec);
409}
410
411unsigned long parse_tag_value(const char *str, struct parse_tag *tags)
412{
413 struct parse_tag *i = tags;
414
415 while (i->tag) {
416 char *s;
417
418 s = strchr(str, i->tag);
419 if (s) {
420 unsigned long int value;
421 char *endptr;
422
423 value = strtoul(str, &endptr, 10);
424 if (s != endptr)
425 break;
426
427 if (value > ULONG_MAX / i->mult)
428 break;
429 value *= i->mult;
430 return value;
431 }
432 i++;
433 }
434
435 return (unsigned long) -1;
436}
437
438int get_stack_size(const char *str, unsigned long *_size)
439{
440 char *endptr;
441 unsigned long size;
442 unsigned long max_size = round_down(USHRT_MAX, sizeof(u64));
443
444 size = strtoul(str, &endptr, 0);
445
446 do {
447 if (*endptr)
448 break;
449
450 size = round_up(size, sizeof(u64));
451 if (!size || size > max_size)
452 break;
453
454 *_size = size;
455 return 0;
456
457 } while (0);
458
459 pr_err("callchain: Incorrect stack dump size (max %ld): %s\n",
460 max_size, str);
461 return -1;
462}
463
464int parse_callchain_record(const char *arg, struct callchain_param *param)
465{
466 char *tok, *name, *saveptr = NULL;
467 char *buf;
468 int ret = -1;
469
470 /* We need buffer that we know we can write to. */
471 buf = malloc(strlen(arg) + 1);
472 if (!buf)
473 return -ENOMEM;
474
475 strcpy(buf, arg);
476
477 tok = strtok_r((char *)buf, ",", &saveptr);
478 name = tok ? : (char *)buf;
479
480 do {
481 /* Framepointer style */
482 if (!strncmp(name, "fp", sizeof("fp"))) {
483 if (!strtok_r(NULL, ",", &saveptr)) {
484 param->record_mode = CALLCHAIN_FP;
485 ret = 0;
486 } else
487 pr_err("callchain: No more arguments "
488 "needed for --call-graph fp\n");
489 break;
490
491 /* Dwarf style */
492 } else if (!strncmp(name, "dwarf", sizeof("dwarf"))) {
493 const unsigned long default_stack_dump_size = 8192;
494
495 ret = 0;
496 param->record_mode = CALLCHAIN_DWARF;
497 param->dump_size = default_stack_dump_size;
498
499 tok = strtok_r(NULL, ",", &saveptr);
500 if (tok) {
501 unsigned long size = 0;
502
503 ret = get_stack_size(tok, &size);
504 param->dump_size = size;
505 }
506 } else if (!strncmp(name, "lbr", sizeof("lbr"))) {
507 if (!strtok_r(NULL, ",", &saveptr)) {
508 param->record_mode = CALLCHAIN_LBR;
509 ret = 0;
510 } else
511 pr_err("callchain: No more arguments "
512 "needed for --call-graph lbr\n");
513 break;
514 } else {
515 pr_err("callchain: Unknown --call-graph option "
516 "value: %s\n", arg);
517 break;
518 }
519
520 } while (0);
521
522 free(buf);
523 return ret;
524}
525
526const char *get_filename_for_perf_kvm(void)
527{
528 const char *filename;
529
530 if (perf_host && !perf_guest)
531 filename = strdup("perf.data.host");
532 else if (!perf_host && perf_guest)
533 filename = strdup("perf.data.guest");
534 else
535 filename = strdup("perf.data.kvm");
536
537 return filename;
538}
539
540int perf_event_paranoid(void)
541{
542 int value;
543
544 if (sysctl__read_int("kernel/perf_event_paranoid", &value))
545 return INT_MAX;
546
547 return value;
548}
549
550void mem_bswap_32(void *src, int byte_size)
551{
552 u32 *m = src;
553 while (byte_size > 0) {
554 *m = bswap_32(*m);
555 byte_size -= sizeof(u32);
556 ++m;
557 }
558}
559
560void mem_bswap_64(void *src, int byte_size)
561{
562 u64 *m = src;
563
564 while (byte_size > 0) {
565 *m = bswap_64(*m);
566 byte_size -= sizeof(u64);
567 ++m;
568 }
569}
570
571bool find_process(const char *name)
572{
573 size_t len = strlen(name);
574 DIR *dir;
575 struct dirent *d;
576 int ret = -1;
577
578 dir = opendir(procfs__mountpoint());
579 if (!dir)
580 return false;
581
582 /* Walk through the directory. */
583 while (ret && (d = readdir(dir)) != NULL) {
584 char path[PATH_MAX];
585 char *data;
586 size_t size;
587
588 if ((d->d_type != DT_DIR) ||
589 !strcmp(".", d->d_name) ||
590 !strcmp("..", d->d_name))
591 continue;
592
593 scnprintf(path, sizeof(path), "%s/%s/comm",
594 procfs__mountpoint(), d->d_name);
595
596 if (filename__read_str(path, &data, &size))
597 continue;
598
599 ret = strncmp(name, data, len);
600 free(data);
601 }
602
603 closedir(dir);
604 return ret ? false : true;
605}
606
607static int
608fetch_ubuntu_kernel_version(unsigned int *puint)
609{
610 ssize_t len;
611 size_t line_len = 0;
612 char *ptr, *line = NULL;
613 int version, patchlevel, sublevel, err;
614 FILE *vsig = fopen("/proc/version_signature", "r");
615
616 if (!vsig) {
617 pr_debug("Open /proc/version_signature failed: %s\n",
618 strerror(errno));
619 return -1;
620 }
621
622 len = getline(&line, &line_len, vsig);
623 fclose(vsig);
624 err = -1;
625 if (len <= 0) {
626 pr_debug("Reading from /proc/version_signature failed: %s\n",
627 strerror(errno));
628 goto errout;
629 }
630
631 ptr = strrchr(line, ' ');
632 if (!ptr) {
633 pr_debug("Parsing /proc/version_signature failed: %s\n", line);
634 goto errout;
635 }
636
637 err = sscanf(ptr + 1, "%d.%d.%d",
638 &version, &patchlevel, &sublevel);
639 if (err != 3) {
640 pr_debug("Unable to get kernel version from /proc/version_signature '%s'\n",
641 line);
642 goto errout;
643 }
644
645 if (puint)
646 *puint = (version << 16) + (patchlevel << 8) + sublevel;
647 err = 0;
648errout:
649 free(line);
650 return err;
651}
652
653int
654fetch_kernel_version(unsigned int *puint, char *str,
655 size_t str_size)
656{
657 struct utsname utsname;
658 int version, patchlevel, sublevel, err;
659 bool int_ver_ready = false;
660
661 if (access("/proc/version_signature", R_OK) == 0)
662 if (!fetch_ubuntu_kernel_version(puint))
663 int_ver_ready = true;
664
665 if (uname(&utsname))
666 return -1;
667
668 if (str && str_size) {
669 strncpy(str, utsname.release, str_size);
670 str[str_size - 1] = '\0';
671 }
672
673 err = sscanf(utsname.release, "%d.%d.%d",
674 &version, &patchlevel, &sublevel);
675
676 if (err != 3) {
677 pr_debug("Unable to get kernel version from uname '%s'\n",
678 utsname.release);
679 return -1;
680 }
681
682 if (puint && !int_ver_ready)
683 *puint = (version << 16) + (patchlevel << 8) + sublevel;
684 return 0;
685}
686
687const char *perf_tip(const char *dirpath)
688{
689 struct strlist *tips;
690 struct str_node *node;
691 char *tip = NULL;
692 struct strlist_config conf = {
693 .dirname = dirpath,
694 .file_only = true,
695 };
696
697 tips = strlist__new("tips.txt", &conf);
698 if (tips == NULL)
699 return errno == ENOENT ? NULL : "Tip: get more memory! ;-p";
700
701 if (strlist__nr_entries(tips) == 0)
702 goto out;
703
704 node = strlist__entry(tips, random() % strlist__nr_entries(tips));
705 if (asprintf(&tip, "Tip: %s", node->s) < 0)
706 tip = (char *)"Tip: get more memory! ;-)";
707
708out:
709 strlist__delete(tips);
710
711 return tip;
712}
713
714bool is_regular_file(const char *file)
715{
716 struct stat st;
717
718 if (stat(file, &st))
719 return false;
720
721 return S_ISREG(st.st_mode);
722}
723
724int fetch_current_timestamp(char *buf, size_t sz)
725{
726 struct timeval tv;
727 struct tm tm;
728 char dt[32];
729
730 if (gettimeofday(&tv, NULL) || !localtime_r(&tv.tv_sec, &tm))
731 return -1;
732
733 if (!strftime(dt, sizeof(dt), "%Y%m%d%H%M%S", &tm))
734 return -1;
735
736 scnprintf(buf, sz, "%s%02u", dt, (unsigned)tv.tv_usec / 10000);
737
738 return 0;
739}
740
741void print_binary(unsigned char *data, size_t len,
742 size_t bytes_per_line, print_binary_t printer,
743 void *extra)
744{
745 size_t i, j, mask;
746
747 if (!printer)
748 return;
749
750 bytes_per_line = roundup_pow_of_two(bytes_per_line);
751 mask = bytes_per_line - 1;
752
753 printer(BINARY_PRINT_DATA_BEGIN, 0, extra);
754 for (i = 0; i < len; i++) {
755 if ((i & mask) == 0) {
756 printer(BINARY_PRINT_LINE_BEGIN, -1, extra);
757 printer(BINARY_PRINT_ADDR, i, extra);
758 }
759
760 printer(BINARY_PRINT_NUM_DATA, data[i], extra);
761
762 if (((i & mask) == mask) || i == len - 1) {
763 for (j = 0; j < mask-(i & mask); j++)
764 printer(BINARY_PRINT_NUM_PAD, -1, extra);
765
766 printer(BINARY_PRINT_SEP, i, extra);
767 for (j = i & ~mask; j <= i; j++)
768 printer(BINARY_PRINT_CHAR_DATA, data[j], extra);
769 for (j = 0; j < mask-(i & mask); j++)
770 printer(BINARY_PRINT_CHAR_PAD, i, extra);
771 printer(BINARY_PRINT_LINE_END, -1, extra);
772 }
773 }
774 printer(BINARY_PRINT_DATA_END, -1, extra);
775}
776
777int is_printable_array(char *p, unsigned int len)
778{
779 unsigned int i;
780
781 if (!p || !len || p[len - 1] != 0)
782 return 0;
783
784 len--;
785
786 for (i = 0; i < len; i++) {
787 if (!isprint(p[i]) && !isspace(p[i]))
788 return 0;
789 }
790 return 1;
791}