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