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