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v4.17
  1// SPDX-License-Identifier: GPL-2.0
  2#include "../perf.h"
  3#include "util.h"
  4#include "debug.h"
  5#include <api/fs/fs.h>
  6#include <sys/mman.h>
  7#include <sys/stat.h>
  8#include <sys/utsname.h>
  9#include <dirent.h>
 10#include <fcntl.h>
 11#include <inttypes.h>
 12#include <signal.h>
 13#include <stdio.h>
 14#include <stdlib.h>
 15#include <string.h>
 16#include <errno.h>
 17#include <limits.h>
 
 18#include <linux/kernel.h>
 19#include <linux/log2.h>
 20#include <linux/time64.h>
 21#include <unistd.h>
 
 22#include "strlist.h"
 23
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 24/*
 25 * XXX We need to find a better place for these things...
 26 */
 27
 28bool perf_singlethreaded = true;
 29
 30void perf_set_singlethreaded(void)
 31{
 32	perf_singlethreaded = true;
 33}
 34
 35void perf_set_multithreaded(void)
 36{
 37	perf_singlethreaded = false;
 38}
 39
 40unsigned int page_size;
 41int cacheline_size;
 42
 43int sysctl_perf_event_max_stack = PERF_MAX_STACK_DEPTH;
 44int sysctl_perf_event_max_contexts_per_stack = PERF_MAX_CONTEXTS_PER_STACK;
 45
 46bool test_attr__enabled;
 47
 48bool perf_host  = true;
 49bool perf_guest = false;
 50
 51void event_attr_init(struct perf_event_attr *attr)
 52{
 53	if (!perf_host)
 54		attr->exclude_host  = 1;
 55	if (!perf_guest)
 56		attr->exclude_guest = 1;
 57	/* to capture ABI version */
 58	attr->size = sizeof(*attr);
 59}
 60
 61int mkdir_p(char *path, mode_t mode)
 62{
 63	struct stat st;
 64	int err;
 65	char *d = path;
 66
 67	if (*d != '/')
 68		return -1;
 69
 70	if (stat(path, &st) == 0)
 71		return 0;
 72
 73	while (*++d == '/');
 74
 75	while ((d = strchr(d, '/'))) {
 76		*d = '\0';
 77		err = stat(path, &st) && mkdir(path, mode);
 78		*d++ = '/';
 79		if (err)
 80			return -1;
 81		while (*d == '/')
 82			++d;
 83	}
 84	return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0;
 85}
 86
 87int rm_rf(const char *path)
 88{
 89	DIR *dir;
 90	int ret = 0;
 91	struct dirent *d;
 92	char namebuf[PATH_MAX];
 93
 94	dir = opendir(path);
 95	if (dir == NULL)
 96		return 0;
 97
 98	while ((d = readdir(dir)) != NULL && !ret) {
 99		struct stat statbuf;
100
101		if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
102			continue;
103
104		scnprintf(namebuf, sizeof(namebuf), "%s/%s",
105			  path, d->d_name);
106
107		/* We have to check symbolic link itself */
108		ret = lstat(namebuf, &statbuf);
109		if (ret < 0) {
110			pr_debug("stat failed: %s\n", namebuf);
111			break;
112		}
113
114		if (S_ISDIR(statbuf.st_mode))
115			ret = rm_rf(namebuf);
116		else
117			ret = unlink(namebuf);
118	}
119	closedir(dir);
120
121	if (ret < 0)
122		return ret;
123
124	return rmdir(path);
125}
126
127/* A filter which removes dot files */
128bool lsdir_no_dot_filter(const char *name __maybe_unused, struct dirent *d)
129{
130	return d->d_name[0] != '.';
131}
132
133/* lsdir reads a directory and store it in strlist */
134struct strlist *lsdir(const char *name,
135		      bool (*filter)(const char *, struct dirent *))
136{
137	struct strlist *list = NULL;
138	DIR *dir;
139	struct dirent *d;
140
141	dir = opendir(name);
142	if (!dir)
143		return NULL;
144
145	list = strlist__new(NULL, NULL);
146	if (!list) {
147		errno = ENOMEM;
148		goto out;
149	}
150
151	while ((d = readdir(dir)) != NULL) {
152		if (!filter || filter(name, d))
153			strlist__add(list, d->d_name);
154	}
155
156out:
157	closedir(dir);
158	return list;
159}
160
161static int slow_copyfile(const char *from, const char *to, struct nsinfo *nsi)
162{
163	int err = -1;
164	char *line = NULL;
165	size_t n;
166	FILE *from_fp, *to_fp;
167	struct nscookie nsc;
168
169	nsinfo__mountns_enter(nsi, &nsc);
170	from_fp = fopen(from, "r");
171	nsinfo__mountns_exit(&nsc);
172	if (from_fp == NULL)
173		goto out;
174
175	to_fp = fopen(to, "w");
176	if (to_fp == NULL)
177		goto out_fclose_from;
178
179	while (getline(&line, &n, from_fp) > 0)
180		if (fputs(line, to_fp) == EOF)
181			goto out_fclose_to;
182	err = 0;
183out_fclose_to:
184	fclose(to_fp);
185	free(line);
186out_fclose_from:
187	fclose(from_fp);
188out:
189	return err;
190}
191
192static int copyfile_offset(int ifd, loff_t off_in, int ofd, loff_t off_out, u64 size)
193{
194	void *ptr;
195	loff_t pgoff;
196
197	pgoff = off_in & ~(page_size - 1);
198	off_in -= pgoff;
199
200	ptr = mmap(NULL, off_in + size, PROT_READ, MAP_PRIVATE, ifd, pgoff);
201	if (ptr == MAP_FAILED)
202		return -1;
203
204	while (size) {
205		ssize_t ret = pwrite(ofd, ptr + off_in, size, off_out);
206		if (ret < 0 && errno == EINTR)
207			continue;
208		if (ret <= 0)
209			break;
210
211		size -= ret;
212		off_in += ret;
213		off_out += ret;
214	}
215	munmap(ptr, off_in + size);
216
217	return size ? -1 : 0;
218}
219
220static int copyfile_mode_ns(const char *from, const char *to, mode_t mode,
221			    struct nsinfo *nsi)
222{
223	int fromfd, tofd;
224	struct stat st;
225	int err;
226	char *tmp = NULL, *ptr = NULL;
227	struct nscookie nsc;
228
229	nsinfo__mountns_enter(nsi, &nsc);
230	err = stat(from, &st);
231	nsinfo__mountns_exit(&nsc);
232	if (err)
233		goto out;
234	err = -1;
235
236	/* extra 'x' at the end is to reserve space for '.' */
237	if (asprintf(&tmp, "%s.XXXXXXx", to) < 0) {
238		tmp = NULL;
239		goto out;
240	}
241	ptr = strrchr(tmp, '/');
242	if (!ptr)
243		goto out;
244	ptr = memmove(ptr + 1, ptr, strlen(ptr) - 1);
245	*ptr = '.';
246
247	tofd = mkstemp(tmp);
248	if (tofd < 0)
249		goto out;
250
251	if (fchmod(tofd, mode))
252		goto out_close_to;
253
254	if (st.st_size == 0) { /* /proc? do it slowly... */
255		err = slow_copyfile(from, tmp, nsi);
256		goto out_close_to;
257	}
258
259	nsinfo__mountns_enter(nsi, &nsc);
260	fromfd = open(from, O_RDONLY);
261	nsinfo__mountns_exit(&nsc);
262	if (fromfd < 0)
263		goto out_close_to;
264
265	err = copyfile_offset(fromfd, 0, tofd, 0, st.st_size);
266
267	close(fromfd);
268out_close_to:
269	close(tofd);
270	if (!err)
271		err = link(tmp, to);
272	unlink(tmp);
273out:
274	free(tmp);
275	return err;
276}
277
278int copyfile_ns(const char *from, const char *to, struct nsinfo *nsi)
279{
280	return copyfile_mode_ns(from, to, 0755, nsi);
281}
282
283int copyfile_mode(const char *from, const char *to, mode_t mode)
284{
285	return copyfile_mode_ns(from, to, mode, NULL);
286}
287
288int copyfile(const char *from, const char *to)
289{
290	return copyfile_mode(from, to, 0755);
 
 
 
 
 
 
 
 
 
 
 
 
 
291}
292
293static ssize_t ion(bool is_read, int fd, void *buf, size_t n)
294{
295	void *buf_start = buf;
296	size_t left = n;
297
298	while (left) {
299		/* buf must be treated as const if !is_read. */
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, const void *buf, size_t n)
328{
329	/* ion does not modify buf. */
330	return ion(false, fd, (void *)buf, n);
331}
332
333size_t hex_width(u64 v)
334{
335	size_t n = 1;
336
337	while ((v >>= 4))
338		++n;
339
340	return n;
341}
342
 
 
 
 
 
 
 
 
 
 
 
343/*
344 * While we find nice hex chars, build a long_val.
345 * Return number of chars processed.
346 */
347int hex2u64(const char *ptr, u64 *long_val)
348{
349	char *p;
 
350
351	*long_val = strtoull(ptr, &p, 16);
 
 
 
 
 
 
 
 
352
353	return p - ptr;
354}
355
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
356int perf_event_paranoid(void)
357{
358	int value;
359
360	if (sysctl__read_int("kernel/perf_event_paranoid", &value))
361		return INT_MAX;
362
363	return value;
364}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
365static int
366fetch_ubuntu_kernel_version(unsigned int *puint)
367{
368	ssize_t len;
369	size_t line_len = 0;
370	char *ptr, *line = NULL;
371	int version, patchlevel, sublevel, err;
372	FILE *vsig;
373
374	if (!puint)
375		return 0;
376
377	vsig = fopen("/proc/version_signature", "r");
378	if (!vsig) {
379		pr_debug("Open /proc/version_signature failed: %s\n",
380			 strerror(errno));
381		return -1;
382	}
383
384	len = getline(&line, &line_len, vsig);
385	fclose(vsig);
386	err = -1;
387	if (len <= 0) {
388		pr_debug("Reading from /proc/version_signature failed: %s\n",
389			 strerror(errno));
390		goto errout;
391	}
392
393	ptr = strrchr(line, ' ');
394	if (!ptr) {
395		pr_debug("Parsing /proc/version_signature failed: %s\n", line);
396		goto errout;
397	}
398
399	err = sscanf(ptr + 1, "%d.%d.%d",
400		     &version, &patchlevel, &sublevel);
401	if (err != 3) {
402		pr_debug("Unable to get kernel version from /proc/version_signature '%s'\n",
403			 line);
404		goto errout;
405	}
406
407	*puint = (version << 16) + (patchlevel << 8) + sublevel;
 
408	err = 0;
409errout:
410	free(line);
411	return err;
412}
413
414int
415fetch_kernel_version(unsigned int *puint, char *str,
416		     size_t str_size)
417{
418	struct utsname utsname;
419	int version, patchlevel, sublevel, err;
420	bool int_ver_ready = false;
421
422	if (access("/proc/version_signature", R_OK) == 0)
423		if (!fetch_ubuntu_kernel_version(puint))
424			int_ver_ready = true;
425
426	if (uname(&utsname))
427		return -1;
428
429	if (str && str_size) {
430		strncpy(str, utsname.release, str_size);
431		str[str_size - 1] = '\0';
432	}
433
434	if (!puint || int_ver_ready)
435		return 0;
436
437	err = sscanf(utsname.release, "%d.%d.%d",
438		     &version, &patchlevel, &sublevel);
439
440	if (err != 3) {
441		pr_debug("Unable to get kernel version from uname '%s'\n",
442			 utsname.release);
443		return -1;
444	}
445
446	*puint = (version << 16) + (patchlevel << 8) + sublevel;
 
447	return 0;
448}
449
450const char *perf_tip(const char *dirpath)
451{
452	struct strlist *tips;
453	struct str_node *node;
454	char *tip = NULL;
455	struct strlist_config conf = {
456		.dirname = dirpath,
457		.file_only = true,
458	};
459
460	tips = strlist__new("tips.txt", &conf);
461	if (tips == NULL)
462		return errno == ENOENT ? NULL :
463			"Tip: check path of tips.txt or get more memory! ;-p";
464
465	if (strlist__nr_entries(tips) == 0)
466		goto out;
467
468	node = strlist__entry(tips, random() % strlist__nr_entries(tips));
469	if (asprintf(&tip, "Tip: %s", node->s) < 0)
470		tip = (char *)"Tip: get more memory! ;-)";
471
472out:
473	strlist__delete(tips);
474
475	return tip;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
476}
v4.10.11
 
  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}