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1/*
2 * config.c
3 *
4 * Helper functions for parsing config items.
5 * Originally copied from GIT source.
6 *
7 * Copyright (C) Linus Torvalds, 2005
8 * Copyright (C) Johannes Schindelin, 2005
9 *
10 */
11#include "util.h"
12#include "cache.h"
13#include <subcmd/exec-cmd.h>
14#include "util/hist.h" /* perf_hist_config */
15#include "util/llvm-utils.h" /* perf_llvm_config */
16
17#define MAXNAME (256)
18
19#define DEBUG_CACHE_DIR ".debug"
20
21
22char buildid_dir[MAXPATHLEN]; /* root dir for buildid, binary cache */
23
24static FILE *config_file;
25static const char *config_file_name;
26static int config_linenr;
27static int config_file_eof;
28
29const char *config_exclusive_filename;
30
31static int get_next_char(void)
32{
33 int c;
34 FILE *f;
35
36 c = '\n';
37 if ((f = config_file) != NULL) {
38 c = fgetc(f);
39 if (c == '\r') {
40 /* DOS like systems */
41 c = fgetc(f);
42 if (c != '\n') {
43 ungetc(c, f);
44 c = '\r';
45 }
46 }
47 if (c == '\n')
48 config_linenr++;
49 if (c == EOF) {
50 config_file_eof = 1;
51 c = '\n';
52 }
53 }
54 return c;
55}
56
57static char *parse_value(void)
58{
59 static char value[1024];
60 int quote = 0, comment = 0, space = 0;
61 size_t len = 0;
62
63 for (;;) {
64 int c = get_next_char();
65
66 if (len >= sizeof(value) - 1)
67 return NULL;
68 if (c == '\n') {
69 if (quote)
70 return NULL;
71 value[len] = 0;
72 return value;
73 }
74 if (comment)
75 continue;
76 if (isspace(c) && !quote) {
77 space = 1;
78 continue;
79 }
80 if (!quote) {
81 if (c == ';' || c == '#') {
82 comment = 1;
83 continue;
84 }
85 }
86 if (space) {
87 if (len)
88 value[len++] = ' ';
89 space = 0;
90 }
91 if (c == '\\') {
92 c = get_next_char();
93 switch (c) {
94 case '\n':
95 continue;
96 case 't':
97 c = '\t';
98 break;
99 case 'b':
100 c = '\b';
101 break;
102 case 'n':
103 c = '\n';
104 break;
105 /* Some characters escape as themselves */
106 case '\\': case '"':
107 break;
108 /* Reject unknown escape sequences */
109 default:
110 return NULL;
111 }
112 value[len++] = c;
113 continue;
114 }
115 if (c == '"') {
116 quote = 1-quote;
117 continue;
118 }
119 value[len++] = c;
120 }
121}
122
123static inline int iskeychar(int c)
124{
125 return isalnum(c) || c == '-' || c == '_';
126}
127
128static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
129{
130 int c;
131 char *value;
132
133 /* Get the full name */
134 for (;;) {
135 c = get_next_char();
136 if (config_file_eof)
137 break;
138 if (!iskeychar(c))
139 break;
140 name[len++] = c;
141 if (len >= MAXNAME)
142 return -1;
143 }
144 name[len] = 0;
145 while (c == ' ' || c == '\t')
146 c = get_next_char();
147
148 value = NULL;
149 if (c != '\n') {
150 if (c != '=')
151 return -1;
152 value = parse_value();
153 if (!value)
154 return -1;
155 }
156 return fn(name, value, data);
157}
158
159static int get_extended_base_var(char *name, int baselen, int c)
160{
161 do {
162 if (c == '\n')
163 return -1;
164 c = get_next_char();
165 } while (isspace(c));
166
167 /* We require the format to be '[base "extension"]' */
168 if (c != '"')
169 return -1;
170 name[baselen++] = '.';
171
172 for (;;) {
173 int ch = get_next_char();
174
175 if (ch == '\n')
176 return -1;
177 if (ch == '"')
178 break;
179 if (ch == '\\') {
180 ch = get_next_char();
181 if (ch == '\n')
182 return -1;
183 }
184 name[baselen++] = ch;
185 if (baselen > MAXNAME / 2)
186 return -1;
187 }
188
189 /* Final ']' */
190 if (get_next_char() != ']')
191 return -1;
192 return baselen;
193}
194
195static int get_base_var(char *name)
196{
197 int baselen = 0;
198
199 for (;;) {
200 int c = get_next_char();
201 if (config_file_eof)
202 return -1;
203 if (c == ']')
204 return baselen;
205 if (isspace(c))
206 return get_extended_base_var(name, baselen, c);
207 if (!iskeychar(c) && c != '.')
208 return -1;
209 if (baselen > MAXNAME / 2)
210 return -1;
211 name[baselen++] = tolower(c);
212 }
213}
214
215static int perf_parse_file(config_fn_t fn, void *data)
216{
217 int comment = 0;
218 int baselen = 0;
219 static char var[MAXNAME];
220
221 /* U+FEFF Byte Order Mark in UTF8 */
222 static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
223 const unsigned char *bomptr = utf8_bom;
224
225 for (;;) {
226 int line, c = get_next_char();
227
228 if (bomptr && *bomptr) {
229 /* We are at the file beginning; skip UTF8-encoded BOM
230 * if present. Sane editors won't put this in on their
231 * own, but e.g. Windows Notepad will do it happily. */
232 if ((unsigned char) c == *bomptr) {
233 bomptr++;
234 continue;
235 } else {
236 /* Do not tolerate partial BOM. */
237 if (bomptr != utf8_bom)
238 break;
239 /* No BOM at file beginning. Cool. */
240 bomptr = NULL;
241 }
242 }
243 if (c == '\n') {
244 if (config_file_eof)
245 return 0;
246 comment = 0;
247 continue;
248 }
249 if (comment || isspace(c))
250 continue;
251 if (c == '#' || c == ';') {
252 comment = 1;
253 continue;
254 }
255 if (c == '[') {
256 baselen = get_base_var(var);
257 if (baselen <= 0)
258 break;
259 var[baselen++] = '.';
260 var[baselen] = 0;
261 continue;
262 }
263 if (!isalpha(c))
264 break;
265 var[baselen] = tolower(c);
266
267 /*
268 * The get_value function might or might not reach the '\n',
269 * so saving the current line number for error reporting.
270 */
271 line = config_linenr;
272 if (get_value(fn, data, var, baselen+1) < 0) {
273 config_linenr = line;
274 break;
275 }
276 }
277 die("bad config file line %d in %s", config_linenr, config_file_name);
278}
279
280static int parse_unit_factor(const char *end, unsigned long *val)
281{
282 if (!*end)
283 return 1;
284 else if (!strcasecmp(end, "k")) {
285 *val *= 1024;
286 return 1;
287 }
288 else if (!strcasecmp(end, "m")) {
289 *val *= 1024 * 1024;
290 return 1;
291 }
292 else if (!strcasecmp(end, "g")) {
293 *val *= 1024 * 1024 * 1024;
294 return 1;
295 }
296 return 0;
297}
298
299static int perf_parse_llong(const char *value, long long *ret)
300{
301 if (value && *value) {
302 char *end;
303 long long val = strtoll(value, &end, 0);
304 unsigned long factor = 1;
305
306 if (!parse_unit_factor(end, &factor))
307 return 0;
308 *ret = val * factor;
309 return 1;
310 }
311 return 0;
312}
313
314static int perf_parse_long(const char *value, long *ret)
315{
316 if (value && *value) {
317 char *end;
318 long val = strtol(value, &end, 0);
319 unsigned long factor = 1;
320 if (!parse_unit_factor(end, &factor))
321 return 0;
322 *ret = val * factor;
323 return 1;
324 }
325 return 0;
326}
327
328static void die_bad_config(const char *name)
329{
330 if (config_file_name)
331 die("bad config value for '%s' in %s", name, config_file_name);
332 die("bad config value for '%s'", name);
333}
334
335u64 perf_config_u64(const char *name, const char *value)
336{
337 long long ret = 0;
338
339 if (!perf_parse_llong(value, &ret))
340 die_bad_config(name);
341 return (u64) ret;
342}
343
344int perf_config_int(const char *name, const char *value)
345{
346 long ret = 0;
347 if (!perf_parse_long(value, &ret))
348 die_bad_config(name);
349 return ret;
350}
351
352static int perf_config_bool_or_int(const char *name, const char *value, int *is_bool)
353{
354 *is_bool = 1;
355 if (!value)
356 return 1;
357 if (!*value)
358 return 0;
359 if (!strcasecmp(value, "true") || !strcasecmp(value, "yes") || !strcasecmp(value, "on"))
360 return 1;
361 if (!strcasecmp(value, "false") || !strcasecmp(value, "no") || !strcasecmp(value, "off"))
362 return 0;
363 *is_bool = 0;
364 return perf_config_int(name, value);
365}
366
367int perf_config_bool(const char *name, const char *value)
368{
369 int discard;
370 return !!perf_config_bool_or_int(name, value, &discard);
371}
372
373const char *perf_config_dirname(const char *name, const char *value)
374{
375 if (!name)
376 return NULL;
377 return value;
378}
379
380static int perf_default_core_config(const char *var __maybe_unused,
381 const char *value __maybe_unused)
382{
383 /* Add other config variables here. */
384 return 0;
385}
386
387static int perf_ui_config(const char *var, const char *value)
388{
389 /* Add other config variables here. */
390 if (!strcmp(var, "ui.show-headers")) {
391 symbol_conf.show_hist_headers = perf_config_bool(var, value);
392 return 0;
393 }
394 return 0;
395}
396
397int perf_default_config(const char *var, const char *value,
398 void *dummy __maybe_unused)
399{
400 if (!prefixcmp(var, "core."))
401 return perf_default_core_config(var, value);
402
403 if (!prefixcmp(var, "hist."))
404 return perf_hist_config(var, value);
405
406 if (!prefixcmp(var, "ui."))
407 return perf_ui_config(var, value);
408
409 if (!prefixcmp(var, "call-graph."))
410 return perf_callchain_config(var, value);
411
412 if (!prefixcmp(var, "llvm."))
413 return perf_llvm_config(var, value);
414
415 /* Add other config variables here. */
416 return 0;
417}
418
419static int perf_config_from_file(config_fn_t fn, const char *filename, void *data)
420{
421 int ret;
422 FILE *f = fopen(filename, "r");
423
424 ret = -1;
425 if (f) {
426 config_file = f;
427 config_file_name = filename;
428 config_linenr = 1;
429 config_file_eof = 0;
430 ret = perf_parse_file(fn, data);
431 fclose(f);
432 config_file_name = NULL;
433 }
434 return ret;
435}
436
437const char *perf_etc_perfconfig(void)
438{
439 static const char *system_wide;
440 if (!system_wide)
441 system_wide = system_path(ETC_PERFCONFIG);
442 return system_wide;
443}
444
445static int perf_env_bool(const char *k, int def)
446{
447 const char *v = getenv(k);
448 return v ? perf_config_bool(k, v) : def;
449}
450
451static int perf_config_system(void)
452{
453 return !perf_env_bool("PERF_CONFIG_NOSYSTEM", 0);
454}
455
456static int perf_config_global(void)
457{
458 return !perf_env_bool("PERF_CONFIG_NOGLOBAL", 0);
459}
460
461int perf_config(config_fn_t fn, void *data)
462{
463 int ret = 0, found = 0;
464 const char *home = NULL;
465
466 /* Setting $PERF_CONFIG makes perf read _only_ the given config file. */
467 if (config_exclusive_filename)
468 return perf_config_from_file(fn, config_exclusive_filename, data);
469 if (perf_config_system() && !access(perf_etc_perfconfig(), R_OK)) {
470 ret += perf_config_from_file(fn, perf_etc_perfconfig(),
471 data);
472 found += 1;
473 }
474
475 home = getenv("HOME");
476 if (perf_config_global() && home) {
477 char *user_config = strdup(mkpath("%s/.perfconfig", home));
478 struct stat st;
479
480 if (user_config == NULL) {
481 warning("Not enough memory to process %s/.perfconfig, "
482 "ignoring it.", home);
483 goto out;
484 }
485
486 if (stat(user_config, &st) < 0)
487 goto out_free;
488
489 if (st.st_uid && (st.st_uid != geteuid())) {
490 warning("File %s not owned by current user or root, "
491 "ignoring it.", user_config);
492 goto out_free;
493 }
494
495 if (!st.st_size)
496 goto out_free;
497
498 ret += perf_config_from_file(fn, user_config, data);
499 found += 1;
500out_free:
501 free(user_config);
502 }
503out:
504 if (found == 0)
505 return -1;
506 return ret;
507}
508
509/*
510 * Call this to report error for your variable that should not
511 * get a boolean value (i.e. "[my] var" means "true").
512 */
513int config_error_nonbool(const char *var)
514{
515 return error("Missing value for '%s'", var);
516}
517
518struct buildid_dir_config {
519 char *dir;
520};
521
522static int buildid_dir_command_config(const char *var, const char *value,
523 void *data)
524{
525 struct buildid_dir_config *c = data;
526 const char *v;
527
528 /* same dir for all commands */
529 if (!strcmp(var, "buildid.dir")) {
530 v = perf_config_dirname(var, value);
531 if (!v)
532 return -1;
533 strncpy(c->dir, v, MAXPATHLEN-1);
534 c->dir[MAXPATHLEN-1] = '\0';
535 }
536 return 0;
537}
538
539static void check_buildid_dir_config(void)
540{
541 struct buildid_dir_config c;
542 c.dir = buildid_dir;
543 perf_config(buildid_dir_command_config, &c);
544}
545
546void set_buildid_dir(const char *dir)
547{
548 if (dir)
549 scnprintf(buildid_dir, MAXPATHLEN-1, "%s", dir);
550
551 /* try config file */
552 if (buildid_dir[0] == '\0')
553 check_buildid_dir_config();
554
555 /* default to $HOME/.debug */
556 if (buildid_dir[0] == '\0') {
557 char *v = getenv("HOME");
558 if (v) {
559 snprintf(buildid_dir, MAXPATHLEN-1, "%s/%s",
560 v, DEBUG_CACHE_DIR);
561 } else {
562 strncpy(buildid_dir, DEBUG_CACHE_DIR, MAXPATHLEN-1);
563 }
564 buildid_dir[MAXPATHLEN-1] = '\0';
565 }
566 /* for communicating with external commands */
567 setenv("PERF_BUILDID_DIR", buildid_dir, 1);
568}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * config.c
4 *
5 * Helper functions for parsing config items.
6 * Originally copied from GIT source.
7 *
8 * Copyright (C) Linus Torvalds, 2005
9 * Copyright (C) Johannes Schindelin, 2005
10 *
11 */
12#include <errno.h>
13#include <sys/param.h>
14#include "cache.h"
15#include "callchain.h"
16#include <subcmd/exec-cmd.h>
17#include "util/event.h" /* proc_map_timeout */
18#include "util/hist.h" /* perf_hist_config */
19#include "util/llvm-utils.h" /* perf_llvm_config */
20#include "build-id.h"
21#include "debug.h"
22#include "config.h"
23#include "debug.h"
24#include <sys/types.h>
25#include <sys/stat.h>
26#include <stdlib.h>
27#include <unistd.h>
28#include <linux/string.h>
29#include <linux/zalloc.h>
30#include <linux/ctype.h>
31
32#define MAXNAME (256)
33
34#define DEBUG_CACHE_DIR ".debug"
35
36
37char buildid_dir[MAXPATHLEN]; /* root dir for buildid, binary cache */
38
39static FILE *config_file;
40static const char *config_file_name;
41static int config_linenr;
42static int config_file_eof;
43static struct perf_config_set *config_set;
44
45const char *config_exclusive_filename;
46
47static int get_next_char(void)
48{
49 int c;
50 FILE *f;
51
52 c = '\n';
53 if ((f = config_file) != NULL) {
54 c = fgetc(f);
55 if (c == '\r') {
56 /* DOS like systems */
57 c = fgetc(f);
58 if (c != '\n') {
59 ungetc(c, f);
60 c = '\r';
61 }
62 }
63 if (c == '\n')
64 config_linenr++;
65 if (c == EOF) {
66 config_file_eof = 1;
67 c = '\n';
68 }
69 }
70 return c;
71}
72
73static char *parse_value(void)
74{
75 static char value[1024];
76 int quote = 0, comment = 0, space = 0;
77 size_t len = 0;
78
79 for (;;) {
80 int c = get_next_char();
81
82 if (len >= sizeof(value) - 1)
83 return NULL;
84 if (c == '\n') {
85 if (quote)
86 return NULL;
87 value[len] = 0;
88 return value;
89 }
90 if (comment)
91 continue;
92 if (isspace(c) && !quote) {
93 space = 1;
94 continue;
95 }
96 if (!quote) {
97 if (c == ';' || c == '#') {
98 comment = 1;
99 continue;
100 }
101 }
102 if (space) {
103 if (len)
104 value[len++] = ' ';
105 space = 0;
106 }
107 if (c == '\\') {
108 c = get_next_char();
109 switch (c) {
110 case '\n':
111 continue;
112 case 't':
113 c = '\t';
114 break;
115 case 'b':
116 c = '\b';
117 break;
118 case 'n':
119 c = '\n';
120 break;
121 /* Some characters escape as themselves */
122 case '\\': case '"':
123 break;
124 /* Reject unknown escape sequences */
125 default:
126 return NULL;
127 }
128 value[len++] = c;
129 continue;
130 }
131 if (c == '"') {
132 quote = 1-quote;
133 continue;
134 }
135 value[len++] = c;
136 }
137}
138
139static inline int iskeychar(int c)
140{
141 return isalnum(c) || c == '-' || c == '_';
142}
143
144static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
145{
146 int c;
147 char *value;
148
149 /* Get the full name */
150 for (;;) {
151 c = get_next_char();
152 if (config_file_eof)
153 break;
154 if (!iskeychar(c))
155 break;
156 name[len++] = c;
157 if (len >= MAXNAME)
158 return -1;
159 }
160 name[len] = 0;
161 while (c == ' ' || c == '\t')
162 c = get_next_char();
163
164 value = NULL;
165 if (c != '\n') {
166 if (c != '=')
167 return -1;
168 value = parse_value();
169 if (!value)
170 return -1;
171 }
172 return fn(name, value, data);
173}
174
175static int get_extended_base_var(char *name, int baselen, int c)
176{
177 do {
178 if (c == '\n')
179 return -1;
180 c = get_next_char();
181 } while (isspace(c));
182
183 /* We require the format to be '[base "extension"]' */
184 if (c != '"')
185 return -1;
186 name[baselen++] = '.';
187
188 for (;;) {
189 int ch = get_next_char();
190
191 if (ch == '\n')
192 return -1;
193 if (ch == '"')
194 break;
195 if (ch == '\\') {
196 ch = get_next_char();
197 if (ch == '\n')
198 return -1;
199 }
200 name[baselen++] = ch;
201 if (baselen > MAXNAME / 2)
202 return -1;
203 }
204
205 /* Final ']' */
206 if (get_next_char() != ']')
207 return -1;
208 return baselen;
209}
210
211static int get_base_var(char *name)
212{
213 int baselen = 0;
214
215 for (;;) {
216 int c = get_next_char();
217 if (config_file_eof)
218 return -1;
219 if (c == ']')
220 return baselen;
221 if (isspace(c))
222 return get_extended_base_var(name, baselen, c);
223 if (!iskeychar(c) && c != '.')
224 return -1;
225 if (baselen > MAXNAME / 2)
226 return -1;
227 name[baselen++] = tolower(c);
228 }
229}
230
231static int perf_parse_file(config_fn_t fn, void *data)
232{
233 int comment = 0;
234 int baselen = 0;
235 static char var[MAXNAME];
236
237 /* U+FEFF Byte Order Mark in UTF8 */
238 static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
239 const unsigned char *bomptr = utf8_bom;
240
241 for (;;) {
242 int line, c = get_next_char();
243
244 if (bomptr && *bomptr) {
245 /* We are at the file beginning; skip UTF8-encoded BOM
246 * if present. Sane editors won't put this in on their
247 * own, but e.g. Windows Notepad will do it happily. */
248 if ((unsigned char) c == *bomptr) {
249 bomptr++;
250 continue;
251 } else {
252 /* Do not tolerate partial BOM. */
253 if (bomptr != utf8_bom)
254 break;
255 /* No BOM at file beginning. Cool. */
256 bomptr = NULL;
257 }
258 }
259 if (c == '\n') {
260 if (config_file_eof)
261 return 0;
262 comment = 0;
263 continue;
264 }
265 if (comment || isspace(c))
266 continue;
267 if (c == '#' || c == ';') {
268 comment = 1;
269 continue;
270 }
271 if (c == '[') {
272 baselen = get_base_var(var);
273 if (baselen <= 0)
274 break;
275 var[baselen++] = '.';
276 var[baselen] = 0;
277 continue;
278 }
279 if (!isalpha(c))
280 break;
281 var[baselen] = tolower(c);
282
283 /*
284 * The get_value function might or might not reach the '\n',
285 * so saving the current line number for error reporting.
286 */
287 line = config_linenr;
288 if (get_value(fn, data, var, baselen+1) < 0) {
289 config_linenr = line;
290 break;
291 }
292 }
293 pr_err("bad config file line %d in %s\n", config_linenr, config_file_name);
294 return -1;
295}
296
297static int parse_unit_factor(const char *end, unsigned long *val)
298{
299 if (!*end)
300 return 1;
301 else if (!strcasecmp(end, "k")) {
302 *val *= 1024;
303 return 1;
304 }
305 else if (!strcasecmp(end, "m")) {
306 *val *= 1024 * 1024;
307 return 1;
308 }
309 else if (!strcasecmp(end, "g")) {
310 *val *= 1024 * 1024 * 1024;
311 return 1;
312 }
313 return 0;
314}
315
316static int perf_parse_llong(const char *value, long long *ret)
317{
318 if (value && *value) {
319 char *end;
320 long long val = strtoll(value, &end, 0);
321 unsigned long factor = 1;
322
323 if (!parse_unit_factor(end, &factor))
324 return 0;
325 *ret = val * factor;
326 return 1;
327 }
328 return 0;
329}
330
331static int perf_parse_long(const char *value, long *ret)
332{
333 if (value && *value) {
334 char *end;
335 long val = strtol(value, &end, 0);
336 unsigned long factor = 1;
337 if (!parse_unit_factor(end, &factor))
338 return 0;
339 *ret = val * factor;
340 return 1;
341 }
342 return 0;
343}
344
345static void bad_config(const char *name)
346{
347 if (config_file_name)
348 pr_warning("bad config value for '%s' in %s, ignoring...\n", name, config_file_name);
349 else
350 pr_warning("bad config value for '%s', ignoring...\n", name);
351}
352
353int perf_config_u64(u64 *dest, const char *name, const char *value)
354{
355 long long ret = 0;
356
357 if (!perf_parse_llong(value, &ret)) {
358 bad_config(name);
359 return -1;
360 }
361
362 *dest = ret;
363 return 0;
364}
365
366int perf_config_int(int *dest, const char *name, const char *value)
367{
368 long ret = 0;
369 if (!perf_parse_long(value, &ret)) {
370 bad_config(name);
371 return -1;
372 }
373 *dest = ret;
374 return 0;
375}
376
377static int perf_config_bool_or_int(const char *name, const char *value, int *is_bool)
378{
379 int ret;
380
381 *is_bool = 1;
382 if (!value)
383 return 1;
384 if (!*value)
385 return 0;
386 if (!strcasecmp(value, "true") || !strcasecmp(value, "yes") || !strcasecmp(value, "on"))
387 return 1;
388 if (!strcasecmp(value, "false") || !strcasecmp(value, "no") || !strcasecmp(value, "off"))
389 return 0;
390 *is_bool = 0;
391 return perf_config_int(&ret, name, value) < 0 ? -1 : ret;
392}
393
394int perf_config_bool(const char *name, const char *value)
395{
396 int discard;
397 return !!perf_config_bool_or_int(name, value, &discard);
398}
399
400static const char *perf_config_dirname(const char *name, const char *value)
401{
402 if (!name)
403 return NULL;
404 return value;
405}
406
407static int perf_buildid_config(const char *var, const char *value)
408{
409 /* same dir for all commands */
410 if (!strcmp(var, "buildid.dir")) {
411 const char *dir = perf_config_dirname(var, value);
412
413 if (!dir) {
414 pr_err("Invalid buildid directory!\n");
415 return -1;
416 }
417 strncpy(buildid_dir, dir, MAXPATHLEN-1);
418 buildid_dir[MAXPATHLEN-1] = '\0';
419 }
420
421 return 0;
422}
423
424static int perf_default_core_config(const char *var __maybe_unused,
425 const char *value __maybe_unused)
426{
427 if (!strcmp(var, "core.proc-map-timeout"))
428 proc_map_timeout = strtoul(value, NULL, 10);
429
430 /* Add other config variables here. */
431 return 0;
432}
433
434static int perf_ui_config(const char *var, const char *value)
435{
436 /* Add other config variables here. */
437 if (!strcmp(var, "ui.show-headers"))
438 symbol_conf.show_hist_headers = perf_config_bool(var, value);
439
440 return 0;
441}
442
443int perf_default_config(const char *var, const char *value,
444 void *dummy __maybe_unused)
445{
446 if (strstarts(var, "core."))
447 return perf_default_core_config(var, value);
448
449 if (strstarts(var, "hist."))
450 return perf_hist_config(var, value);
451
452 if (strstarts(var, "ui."))
453 return perf_ui_config(var, value);
454
455 if (strstarts(var, "call-graph."))
456 return perf_callchain_config(var, value);
457
458 if (strstarts(var, "llvm."))
459 return perf_llvm_config(var, value);
460
461 if (strstarts(var, "buildid."))
462 return perf_buildid_config(var, value);
463
464 /* Add other config variables here. */
465 return 0;
466}
467
468static int perf_config_from_file(config_fn_t fn, const char *filename, void *data)
469{
470 int ret;
471 FILE *f = fopen(filename, "r");
472
473 ret = -1;
474 if (f) {
475 config_file = f;
476 config_file_name = filename;
477 config_linenr = 1;
478 config_file_eof = 0;
479 ret = perf_parse_file(fn, data);
480 fclose(f);
481 config_file_name = NULL;
482 }
483 return ret;
484}
485
486const char *perf_etc_perfconfig(void)
487{
488 static const char *system_wide;
489 if (!system_wide)
490 system_wide = system_path(ETC_PERFCONFIG);
491 return system_wide;
492}
493
494static int perf_env_bool(const char *k, int def)
495{
496 const char *v = getenv(k);
497 return v ? perf_config_bool(k, v) : def;
498}
499
500static int perf_config_system(void)
501{
502 return !perf_env_bool("PERF_CONFIG_NOSYSTEM", 0);
503}
504
505static int perf_config_global(void)
506{
507 return !perf_env_bool("PERF_CONFIG_NOGLOBAL", 0);
508}
509
510static struct perf_config_section *find_section(struct list_head *sections,
511 const char *section_name)
512{
513 struct perf_config_section *section;
514
515 list_for_each_entry(section, sections, node)
516 if (!strcmp(section->name, section_name))
517 return section;
518
519 return NULL;
520}
521
522static struct perf_config_item *find_config_item(const char *name,
523 struct perf_config_section *section)
524{
525 struct perf_config_item *item;
526
527 list_for_each_entry(item, §ion->items, node)
528 if (!strcmp(item->name, name))
529 return item;
530
531 return NULL;
532}
533
534static struct perf_config_section *add_section(struct list_head *sections,
535 const char *section_name)
536{
537 struct perf_config_section *section = zalloc(sizeof(*section));
538
539 if (!section)
540 return NULL;
541
542 INIT_LIST_HEAD(§ion->items);
543 section->name = strdup(section_name);
544 if (!section->name) {
545 pr_debug("%s: strdup failed\n", __func__);
546 free(section);
547 return NULL;
548 }
549
550 list_add_tail(§ion->node, sections);
551 return section;
552}
553
554static struct perf_config_item *add_config_item(struct perf_config_section *section,
555 const char *name)
556{
557 struct perf_config_item *item = zalloc(sizeof(*item));
558
559 if (!item)
560 return NULL;
561
562 item->name = strdup(name);
563 if (!item->name) {
564 pr_debug("%s: strdup failed\n", __func__);
565 free(item);
566 return NULL;
567 }
568
569 list_add_tail(&item->node, §ion->items);
570 return item;
571}
572
573static int set_value(struct perf_config_item *item, const char *value)
574{
575 char *val = strdup(value);
576
577 if (!val)
578 return -1;
579
580 zfree(&item->value);
581 item->value = val;
582 return 0;
583}
584
585static int collect_config(const char *var, const char *value,
586 void *perf_config_set)
587{
588 int ret = -1;
589 char *ptr, *key;
590 char *section_name, *name;
591 struct perf_config_section *section = NULL;
592 struct perf_config_item *item = NULL;
593 struct perf_config_set *set = perf_config_set;
594 struct list_head *sections;
595
596 if (set == NULL)
597 return -1;
598
599 sections = &set->sections;
600 key = ptr = strdup(var);
601 if (!key) {
602 pr_debug("%s: strdup failed\n", __func__);
603 return -1;
604 }
605
606 section_name = strsep(&ptr, ".");
607 name = ptr;
608 if (name == NULL || value == NULL)
609 goto out_free;
610
611 section = find_section(sections, section_name);
612 if (!section) {
613 section = add_section(sections, section_name);
614 if (!section)
615 goto out_free;
616 }
617
618 item = find_config_item(name, section);
619 if (!item) {
620 item = add_config_item(section, name);
621 if (!item)
622 goto out_free;
623 }
624
625 /* perf_config_set can contain both user and system config items.
626 * So we should know where each value is from.
627 * The classification would be needed when a particular config file
628 * is overwrited by setting feature i.e. set_config().
629 */
630 if (strcmp(config_file_name, perf_etc_perfconfig()) == 0) {
631 section->from_system_config = true;
632 item->from_system_config = true;
633 } else {
634 section->from_system_config = false;
635 item->from_system_config = false;
636 }
637
638 ret = set_value(item, value);
639
640out_free:
641 free(key);
642 return ret;
643}
644
645int perf_config_set__collect(struct perf_config_set *set, const char *file_name,
646 const char *var, const char *value)
647{
648 config_file_name = file_name;
649 return collect_config(var, value, set);
650}
651
652static int perf_config_set__init(struct perf_config_set *set)
653{
654 int ret = -1;
655 const char *home = NULL;
656 char *user_config;
657 struct stat st;
658
659 /* Setting $PERF_CONFIG makes perf read _only_ the given config file. */
660 if (config_exclusive_filename)
661 return perf_config_from_file(collect_config, config_exclusive_filename, set);
662 if (perf_config_system() && !access(perf_etc_perfconfig(), R_OK)) {
663 if (perf_config_from_file(collect_config, perf_etc_perfconfig(), set) < 0)
664 goto out;
665 }
666
667 home = getenv("HOME");
668
669 /*
670 * Skip reading user config if:
671 * - there is no place to read it from (HOME)
672 * - we are asked not to (PERF_CONFIG_NOGLOBAL=1)
673 */
674 if (!home || !*home || !perf_config_global())
675 return 0;
676
677 user_config = strdup(mkpath("%s/.perfconfig", home));
678 if (user_config == NULL) {
679 pr_warning("Not enough memory to process %s/.perfconfig, ignoring it.", home);
680 goto out;
681 }
682
683 if (stat(user_config, &st) < 0) {
684 if (errno == ENOENT)
685 ret = 0;
686 goto out_free;
687 }
688
689 ret = 0;
690
691 if (st.st_uid && (st.st_uid != geteuid())) {
692 pr_warning("File %s not owned by current user or root, ignoring it.", user_config);
693 goto out_free;
694 }
695
696 if (st.st_size)
697 ret = perf_config_from_file(collect_config, user_config, set);
698
699out_free:
700 free(user_config);
701out:
702 return ret;
703}
704
705struct perf_config_set *perf_config_set__new(void)
706{
707 struct perf_config_set *set = zalloc(sizeof(*set));
708
709 if (set) {
710 INIT_LIST_HEAD(&set->sections);
711 perf_config_set__init(set);
712 }
713
714 return set;
715}
716
717static int perf_config__init(void)
718{
719 if (config_set == NULL)
720 config_set = perf_config_set__new();
721
722 return config_set == NULL;
723}
724
725int perf_config(config_fn_t fn, void *data)
726{
727 int ret = 0;
728 char key[BUFSIZ];
729 struct perf_config_section *section;
730 struct perf_config_item *item;
731
732 if (config_set == NULL && perf_config__init())
733 return -1;
734
735 perf_config_set__for_each_entry(config_set, section, item) {
736 char *value = item->value;
737
738 if (value) {
739 scnprintf(key, sizeof(key), "%s.%s",
740 section->name, item->name);
741 ret = fn(key, value, data);
742 if (ret < 0) {
743 pr_err("Error: wrong config key-value pair %s=%s\n",
744 key, value);
745 /*
746 * Can't be just a 'break', as perf_config_set__for_each_entry()
747 * expands to two nested for() loops.
748 */
749 goto out;
750 }
751 }
752 }
753out:
754 return ret;
755}
756
757void perf_config__exit(void)
758{
759 perf_config_set__delete(config_set);
760 config_set = NULL;
761}
762
763void perf_config__refresh(void)
764{
765 perf_config__exit();
766 perf_config__init();
767}
768
769static void perf_config_item__delete(struct perf_config_item *item)
770{
771 zfree(&item->name);
772 zfree(&item->value);
773 free(item);
774}
775
776static void perf_config_section__purge(struct perf_config_section *section)
777{
778 struct perf_config_item *item, *tmp;
779
780 list_for_each_entry_safe(item, tmp, §ion->items, node) {
781 list_del_init(&item->node);
782 perf_config_item__delete(item);
783 }
784}
785
786static void perf_config_section__delete(struct perf_config_section *section)
787{
788 perf_config_section__purge(section);
789 zfree(§ion->name);
790 free(section);
791}
792
793static void perf_config_set__purge(struct perf_config_set *set)
794{
795 struct perf_config_section *section, *tmp;
796
797 list_for_each_entry_safe(section, tmp, &set->sections, node) {
798 list_del_init(§ion->node);
799 perf_config_section__delete(section);
800 }
801}
802
803void perf_config_set__delete(struct perf_config_set *set)
804{
805 if (set == NULL)
806 return;
807
808 perf_config_set__purge(set);
809 free(set);
810}
811
812/*
813 * Call this to report error for your variable that should not
814 * get a boolean value (i.e. "[my] var" means "true").
815 */
816int config_error_nonbool(const char *var)
817{
818 pr_err("Missing value for '%s'", var);
819 return -1;
820}
821
822void set_buildid_dir(const char *dir)
823{
824 if (dir)
825 scnprintf(buildid_dir, MAXPATHLEN, "%s", dir);
826
827 /* default to $HOME/.debug */
828 if (buildid_dir[0] == '\0') {
829 char *home = getenv("HOME");
830
831 if (home) {
832 snprintf(buildid_dir, MAXPATHLEN, "%s/%s",
833 home, DEBUG_CACHE_DIR);
834 } else {
835 strncpy(buildid_dir, DEBUG_CACHE_DIR, MAXPATHLEN-1);
836 }
837 buildid_dir[MAXPATHLEN-1] = '\0';
838 }
839 /* for communicating with external commands */
840 setenv("PERF_BUILDID_DIR", buildid_dir, 1);
841}