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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 "exec_cmd.h"
14
15#define MAXNAME (256)
16
17#define DEBUG_CACHE_DIR ".debug"
18
19
20char buildid_dir[MAXPATHLEN]; /* root dir for buildid, binary cache */
21
22static FILE *config_file;
23static const char *config_file_name;
24static int config_linenr;
25static int config_file_eof;
26
27static const char *config_exclusive_filename;
28
29static int get_next_char(void)
30{
31 int c;
32 FILE *f;
33
34 c = '\n';
35 if ((f = config_file) != NULL) {
36 c = fgetc(f);
37 if (c == '\r') {
38 /* DOS like systems */
39 c = fgetc(f);
40 if (c != '\n') {
41 ungetc(c, f);
42 c = '\r';
43 }
44 }
45 if (c == '\n')
46 config_linenr++;
47 if (c == EOF) {
48 config_file_eof = 1;
49 c = '\n';
50 }
51 }
52 return c;
53}
54
55static char *parse_value(void)
56{
57 static char value[1024];
58 int quote = 0, comment = 0, space = 0;
59 size_t len = 0;
60
61 for (;;) {
62 int c = get_next_char();
63
64 if (len >= sizeof(value) - 1)
65 return NULL;
66 if (c == '\n') {
67 if (quote)
68 return NULL;
69 value[len] = 0;
70 return value;
71 }
72 if (comment)
73 continue;
74 if (isspace(c) && !quote) {
75 space = 1;
76 continue;
77 }
78 if (!quote) {
79 if (c == ';' || c == '#') {
80 comment = 1;
81 continue;
82 }
83 }
84 if (space) {
85 if (len)
86 value[len++] = ' ';
87 space = 0;
88 }
89 if (c == '\\') {
90 c = get_next_char();
91 switch (c) {
92 case '\n':
93 continue;
94 case 't':
95 c = '\t';
96 break;
97 case 'b':
98 c = '\b';
99 break;
100 case 'n':
101 c = '\n';
102 break;
103 /* Some characters escape as themselves */
104 case '\\': case '"':
105 break;
106 /* Reject unknown escape sequences */
107 default:
108 return NULL;
109 }
110 value[len++] = c;
111 continue;
112 }
113 if (c == '"') {
114 quote = 1-quote;
115 continue;
116 }
117 value[len++] = c;
118 }
119}
120
121static inline int iskeychar(int c)
122{
123 return isalnum(c) || c == '-' || c == '_';
124}
125
126static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
127{
128 int c;
129 char *value;
130
131 /* Get the full name */
132 for (;;) {
133 c = get_next_char();
134 if (config_file_eof)
135 break;
136 if (!iskeychar(c))
137 break;
138 name[len++] = c;
139 if (len >= MAXNAME)
140 return -1;
141 }
142 name[len] = 0;
143 while (c == ' ' || c == '\t')
144 c = get_next_char();
145
146 value = NULL;
147 if (c != '\n') {
148 if (c != '=')
149 return -1;
150 value = parse_value();
151 if (!value)
152 return -1;
153 }
154 return fn(name, value, data);
155}
156
157static int get_extended_base_var(char *name, int baselen, int c)
158{
159 do {
160 if (c == '\n')
161 return -1;
162 c = get_next_char();
163 } while (isspace(c));
164
165 /* We require the format to be '[base "extension"]' */
166 if (c != '"')
167 return -1;
168 name[baselen++] = '.';
169
170 for (;;) {
171 int ch = get_next_char();
172
173 if (ch == '\n')
174 return -1;
175 if (ch == '"')
176 break;
177 if (ch == '\\') {
178 ch = get_next_char();
179 if (ch == '\n')
180 return -1;
181 }
182 name[baselen++] = ch;
183 if (baselen > MAXNAME / 2)
184 return -1;
185 }
186
187 /* Final ']' */
188 if (get_next_char() != ']')
189 return -1;
190 return baselen;
191}
192
193static int get_base_var(char *name)
194{
195 int baselen = 0;
196
197 for (;;) {
198 int c = get_next_char();
199 if (config_file_eof)
200 return -1;
201 if (c == ']')
202 return baselen;
203 if (isspace(c))
204 return get_extended_base_var(name, baselen, c);
205 if (!iskeychar(c) && c != '.')
206 return -1;
207 if (baselen > MAXNAME / 2)
208 return -1;
209 name[baselen++] = tolower(c);
210 }
211}
212
213static int perf_parse_file(config_fn_t fn, void *data)
214{
215 int comment = 0;
216 int baselen = 0;
217 static char var[MAXNAME];
218
219 /* U+FEFF Byte Order Mark in UTF8 */
220 static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
221 const unsigned char *bomptr = utf8_bom;
222
223 for (;;) {
224 int c = get_next_char();
225 if (bomptr && *bomptr) {
226 /* We are at the file beginning; skip UTF8-encoded BOM
227 * if present. Sane editors won't put this in on their
228 * own, but e.g. Windows Notepad will do it happily. */
229 if ((unsigned char) c == *bomptr) {
230 bomptr++;
231 continue;
232 } else {
233 /* Do not tolerate partial BOM. */
234 if (bomptr != utf8_bom)
235 break;
236 /* No BOM at file beginning. Cool. */
237 bomptr = NULL;
238 }
239 }
240 if (c == '\n') {
241 if (config_file_eof)
242 return 0;
243 comment = 0;
244 continue;
245 }
246 if (comment || isspace(c))
247 continue;
248 if (c == '#' || c == ';') {
249 comment = 1;
250 continue;
251 }
252 if (c == '[') {
253 baselen = get_base_var(var);
254 if (baselen <= 0)
255 break;
256 var[baselen++] = '.';
257 var[baselen] = 0;
258 continue;
259 }
260 if (!isalpha(c))
261 break;
262 var[baselen] = tolower(c);
263 if (get_value(fn, data, var, baselen+1) < 0)
264 break;
265 }
266 die("bad config file line %d in %s", config_linenr, config_file_name);
267}
268
269static int parse_unit_factor(const char *end, unsigned long *val)
270{
271 if (!*end)
272 return 1;
273 else if (!strcasecmp(end, "k")) {
274 *val *= 1024;
275 return 1;
276 }
277 else if (!strcasecmp(end, "m")) {
278 *val *= 1024 * 1024;
279 return 1;
280 }
281 else if (!strcasecmp(end, "g")) {
282 *val *= 1024 * 1024 * 1024;
283 return 1;
284 }
285 return 0;
286}
287
288static int perf_parse_long(const char *value, long *ret)
289{
290 if (value && *value) {
291 char *end;
292 long val = strtol(value, &end, 0);
293 unsigned long factor = 1;
294 if (!parse_unit_factor(end, &factor))
295 return 0;
296 *ret = val * factor;
297 return 1;
298 }
299 return 0;
300}
301
302static void die_bad_config(const char *name)
303{
304 if (config_file_name)
305 die("bad config value for '%s' in %s", name, config_file_name);
306 die("bad config value for '%s'", name);
307}
308
309int perf_config_int(const char *name, const char *value)
310{
311 long ret = 0;
312 if (!perf_parse_long(value, &ret))
313 die_bad_config(name);
314 return ret;
315}
316
317static int perf_config_bool_or_int(const char *name, const char *value, int *is_bool)
318{
319 *is_bool = 1;
320 if (!value)
321 return 1;
322 if (!*value)
323 return 0;
324 if (!strcasecmp(value, "true") || !strcasecmp(value, "yes") || !strcasecmp(value, "on"))
325 return 1;
326 if (!strcasecmp(value, "false") || !strcasecmp(value, "no") || !strcasecmp(value, "off"))
327 return 0;
328 *is_bool = 0;
329 return perf_config_int(name, value);
330}
331
332int perf_config_bool(const char *name, const char *value)
333{
334 int discard;
335 return !!perf_config_bool_or_int(name, value, &discard);
336}
337
338const char *perf_config_dirname(const char *name, const char *value)
339{
340 if (!name)
341 return NULL;
342 return value;
343}
344
345static int perf_default_core_config(const char *var __used, const char *value __used)
346{
347 /* Add other config variables here. */
348 return 0;
349}
350
351int perf_default_config(const char *var, const char *value, void *dummy __used)
352{
353 if (!prefixcmp(var, "core."))
354 return perf_default_core_config(var, value);
355
356 /* Add other config variables here. */
357 return 0;
358}
359
360static int perf_config_from_file(config_fn_t fn, const char *filename, void *data)
361{
362 int ret;
363 FILE *f = fopen(filename, "r");
364
365 ret = -1;
366 if (f) {
367 config_file = f;
368 config_file_name = filename;
369 config_linenr = 1;
370 config_file_eof = 0;
371 ret = perf_parse_file(fn, data);
372 fclose(f);
373 config_file_name = NULL;
374 }
375 return ret;
376}
377
378static const char *perf_etc_perfconfig(void)
379{
380 static const char *system_wide;
381 if (!system_wide)
382 system_wide = system_path(ETC_PERFCONFIG);
383 return system_wide;
384}
385
386static int perf_env_bool(const char *k, int def)
387{
388 const char *v = getenv(k);
389 return v ? perf_config_bool(k, v) : def;
390}
391
392static int perf_config_system(void)
393{
394 return !perf_env_bool("PERF_CONFIG_NOSYSTEM", 0);
395}
396
397static int perf_config_global(void)
398{
399 return !perf_env_bool("PERF_CONFIG_NOGLOBAL", 0);
400}
401
402int perf_config(config_fn_t fn, void *data)
403{
404 int ret = 0, found = 0;
405 const char *home = NULL;
406
407 /* Setting $PERF_CONFIG makes perf read _only_ the given config file. */
408 if (config_exclusive_filename)
409 return perf_config_from_file(fn, config_exclusive_filename, data);
410 if (perf_config_system() && !access(perf_etc_perfconfig(), R_OK)) {
411 ret += perf_config_from_file(fn, perf_etc_perfconfig(),
412 data);
413 found += 1;
414 }
415
416 home = getenv("HOME");
417 if (perf_config_global() && home) {
418 char *user_config = strdup(mkpath("%s/.perfconfig", home));
419 struct stat st;
420
421 if (user_config == NULL) {
422 warning("Not enough memory to process %s/.perfconfig, "
423 "ignoring it.", home);
424 goto out;
425 }
426
427 if (stat(user_config, &st) < 0)
428 goto out_free;
429
430 if (st.st_uid && (st.st_uid != geteuid())) {
431 warning("File %s not owned by current user or root, "
432 "ignoring it.", user_config);
433 goto out_free;
434 }
435
436 if (!st.st_size)
437 goto out_free;
438
439 ret += perf_config_from_file(fn, user_config, data);
440 found += 1;
441out_free:
442 free(user_config);
443 }
444out:
445 if (found == 0)
446 return -1;
447 return ret;
448}
449
450/*
451 * Call this to report error for your variable that should not
452 * get a boolean value (i.e. "[my] var" means "true").
453 */
454int config_error_nonbool(const char *var)
455{
456 return error("Missing value for '%s'", var);
457}
458
459struct buildid_dir_config {
460 char *dir;
461};
462
463static int buildid_dir_command_config(const char *var, const char *value,
464 void *data)
465{
466 struct buildid_dir_config *c = data;
467 const char *v;
468
469 /* same dir for all commands */
470 if (!prefixcmp(var, "buildid.") && !strcmp(var + 8, "dir")) {
471 v = perf_config_dirname(var, value);
472 if (!v)
473 return -1;
474 strncpy(c->dir, v, MAXPATHLEN-1);
475 c->dir[MAXPATHLEN-1] = '\0';
476 }
477 return 0;
478}
479
480static void check_buildid_dir_config(void)
481{
482 struct buildid_dir_config c;
483 c.dir = buildid_dir;
484 perf_config(buildid_dir_command_config, &c);
485}
486
487void set_buildid_dir(void)
488{
489 buildid_dir[0] = '\0';
490
491 /* try config file */
492 check_buildid_dir_config();
493
494 /* default to $HOME/.debug */
495 if (buildid_dir[0] == '\0') {
496 char *v = getenv("HOME");
497 if (v) {
498 snprintf(buildid_dir, MAXPATHLEN-1, "%s/%s",
499 v, DEBUG_CACHE_DIR);
500 } else {
501 strncpy(buildid_dir, DEBUG_CACHE_DIR, MAXPATHLEN-1);
502 }
503 buildid_dir[MAXPATHLEN-1] = '\0';
504 }
505 /* for communicating with external commands */
506 setenv("PERF_BUILDID_DIR", buildid_dir, 1);
507}
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 "util/stat.h" /* perf_stat__set_big_num */
21#include "build-id.h"
22#include "debug.h"
23#include "config.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
377int perf_config_u8(u8 *dest, const char *name, const char *value)
378{
379 long ret = 0;
380
381 if (!perf_parse_long(value, &ret)) {
382 bad_config(name);
383 return -1;
384 }
385 *dest = ret;
386 return 0;
387}
388
389static int perf_config_bool_or_int(const char *name, const char *value, int *is_bool)
390{
391 int ret;
392
393 *is_bool = 1;
394 if (!value)
395 return 1;
396 if (!*value)
397 return 0;
398 if (!strcasecmp(value, "true") || !strcasecmp(value, "yes") || !strcasecmp(value, "on"))
399 return 1;
400 if (!strcasecmp(value, "false") || !strcasecmp(value, "no") || !strcasecmp(value, "off"))
401 return 0;
402 *is_bool = 0;
403 return perf_config_int(&ret, name, value) < 0 ? -1 : ret;
404}
405
406int perf_config_bool(const char *name, const char *value)
407{
408 int discard;
409 return !!perf_config_bool_or_int(name, value, &discard);
410}
411
412static const char *perf_config_dirname(const char *name, const char *value)
413{
414 if (!name)
415 return NULL;
416 return value;
417}
418
419static int perf_buildid_config(const char *var, const char *value)
420{
421 /* same dir for all commands */
422 if (!strcmp(var, "buildid.dir")) {
423 const char *dir = perf_config_dirname(var, value);
424
425 if (!dir) {
426 pr_err("Invalid buildid directory!\n");
427 return -1;
428 }
429 strncpy(buildid_dir, dir, MAXPATHLEN-1);
430 buildid_dir[MAXPATHLEN-1] = '\0';
431 }
432
433 return 0;
434}
435
436static int perf_default_core_config(const char *var __maybe_unused,
437 const char *value __maybe_unused)
438{
439 if (!strcmp(var, "core.proc-map-timeout"))
440 proc_map_timeout = strtoul(value, NULL, 10);
441
442 /* Add other config variables here. */
443 return 0;
444}
445
446static int perf_ui_config(const char *var, const char *value)
447{
448 /* Add other config variables here. */
449 if (!strcmp(var, "ui.show-headers"))
450 symbol_conf.show_hist_headers = perf_config_bool(var, value);
451
452 return 0;
453}
454
455static int perf_stat_config(const char *var, const char *value)
456{
457 if (!strcmp(var, "stat.big-num"))
458 perf_stat__set_big_num(perf_config_bool(var, value));
459
460 /* Add other config variables here. */
461 return 0;
462}
463
464int perf_default_config(const char *var, const char *value,
465 void *dummy __maybe_unused)
466{
467 if (strstarts(var, "core."))
468 return perf_default_core_config(var, value);
469
470 if (strstarts(var, "hist."))
471 return perf_hist_config(var, value);
472
473 if (strstarts(var, "ui."))
474 return perf_ui_config(var, value);
475
476 if (strstarts(var, "call-graph."))
477 return perf_callchain_config(var, value);
478
479 if (strstarts(var, "llvm."))
480 return perf_llvm_config(var, value);
481
482 if (strstarts(var, "buildid."))
483 return perf_buildid_config(var, value);
484
485 if (strstarts(var, "stat."))
486 return perf_stat_config(var, value);
487
488 /* Add other config variables here. */
489 return 0;
490}
491
492static int perf_config_from_file(config_fn_t fn, const char *filename, void *data)
493{
494 int ret;
495 FILE *f = fopen(filename, "r");
496
497 ret = -1;
498 if (f) {
499 config_file = f;
500 config_file_name = filename;
501 config_linenr = 1;
502 config_file_eof = 0;
503 ret = perf_parse_file(fn, data);
504 fclose(f);
505 config_file_name = NULL;
506 }
507 return ret;
508}
509
510const char *perf_etc_perfconfig(void)
511{
512 static const char *system_wide;
513 if (!system_wide)
514 system_wide = system_path(ETC_PERFCONFIG);
515 return system_wide;
516}
517
518static int perf_env_bool(const char *k, int def)
519{
520 const char *v = getenv(k);
521 return v ? perf_config_bool(k, v) : def;
522}
523
524static int perf_config_system(void)
525{
526 return !perf_env_bool("PERF_CONFIG_NOSYSTEM", 0);
527}
528
529static int perf_config_global(void)
530{
531 return !perf_env_bool("PERF_CONFIG_NOGLOBAL", 0);
532}
533
534static struct perf_config_section *find_section(struct list_head *sections,
535 const char *section_name)
536{
537 struct perf_config_section *section;
538
539 list_for_each_entry(section, sections, node)
540 if (!strcmp(section->name, section_name))
541 return section;
542
543 return NULL;
544}
545
546static struct perf_config_item *find_config_item(const char *name,
547 struct perf_config_section *section)
548{
549 struct perf_config_item *item;
550
551 list_for_each_entry(item, §ion->items, node)
552 if (!strcmp(item->name, name))
553 return item;
554
555 return NULL;
556}
557
558static struct perf_config_section *add_section(struct list_head *sections,
559 const char *section_name)
560{
561 struct perf_config_section *section = zalloc(sizeof(*section));
562
563 if (!section)
564 return NULL;
565
566 INIT_LIST_HEAD(§ion->items);
567 section->name = strdup(section_name);
568 if (!section->name) {
569 pr_debug("%s: strdup failed\n", __func__);
570 free(section);
571 return NULL;
572 }
573
574 list_add_tail(§ion->node, sections);
575 return section;
576}
577
578static struct perf_config_item *add_config_item(struct perf_config_section *section,
579 const char *name)
580{
581 struct perf_config_item *item = zalloc(sizeof(*item));
582
583 if (!item)
584 return NULL;
585
586 item->name = strdup(name);
587 if (!item->name) {
588 pr_debug("%s: strdup failed\n", __func__);
589 free(item);
590 return NULL;
591 }
592
593 list_add_tail(&item->node, §ion->items);
594 return item;
595}
596
597static int set_value(struct perf_config_item *item, const char *value)
598{
599 char *val = strdup(value);
600
601 if (!val)
602 return -1;
603
604 zfree(&item->value);
605 item->value = val;
606 return 0;
607}
608
609static int collect_config(const char *var, const char *value,
610 void *perf_config_set)
611{
612 int ret = -1;
613 char *ptr, *key;
614 char *section_name, *name;
615 struct perf_config_section *section = NULL;
616 struct perf_config_item *item = NULL;
617 struct perf_config_set *set = perf_config_set;
618 struct list_head *sections;
619
620 if (set == NULL)
621 return -1;
622
623 sections = &set->sections;
624 key = ptr = strdup(var);
625 if (!key) {
626 pr_debug("%s: strdup failed\n", __func__);
627 return -1;
628 }
629
630 section_name = strsep(&ptr, ".");
631 name = ptr;
632 if (name == NULL || value == NULL)
633 goto out_free;
634
635 section = find_section(sections, section_name);
636 if (!section) {
637 section = add_section(sections, section_name);
638 if (!section)
639 goto out_free;
640 }
641
642 item = find_config_item(name, section);
643 if (!item) {
644 item = add_config_item(section, name);
645 if (!item)
646 goto out_free;
647 }
648
649 /* perf_config_set can contain both user and system config items.
650 * So we should know where each value is from.
651 * The classification would be needed when a particular config file
652 * is overwrited by setting feature i.e. set_config().
653 */
654 if (strcmp(config_file_name, perf_etc_perfconfig()) == 0) {
655 section->from_system_config = true;
656 item->from_system_config = true;
657 } else {
658 section->from_system_config = false;
659 item->from_system_config = false;
660 }
661
662 ret = set_value(item, value);
663
664out_free:
665 free(key);
666 return ret;
667}
668
669int perf_config_set__collect(struct perf_config_set *set, const char *file_name,
670 const char *var, const char *value)
671{
672 config_file_name = file_name;
673 return collect_config(var, value, set);
674}
675
676static int perf_config_set__init(struct perf_config_set *set)
677{
678 int ret = -1;
679 const char *home = NULL;
680 char *user_config;
681 struct stat st;
682
683 /* Setting $PERF_CONFIG makes perf read _only_ the given config file. */
684 if (config_exclusive_filename)
685 return perf_config_from_file(collect_config, config_exclusive_filename, set);
686 if (perf_config_system() && !access(perf_etc_perfconfig(), R_OK)) {
687 if (perf_config_from_file(collect_config, perf_etc_perfconfig(), set) < 0)
688 goto out;
689 }
690
691 home = getenv("HOME");
692
693 /*
694 * Skip reading user config if:
695 * - there is no place to read it from (HOME)
696 * - we are asked not to (PERF_CONFIG_NOGLOBAL=1)
697 */
698 if (!home || !*home || !perf_config_global())
699 return 0;
700
701 user_config = strdup(mkpath("%s/.perfconfig", home));
702 if (user_config == NULL) {
703 pr_warning("Not enough memory to process %s/.perfconfig, ignoring it.", home);
704 goto out;
705 }
706
707 if (stat(user_config, &st) < 0) {
708 if (errno == ENOENT)
709 ret = 0;
710 goto out_free;
711 }
712
713 ret = 0;
714
715 if (st.st_uid && (st.st_uid != geteuid())) {
716 pr_warning("File %s not owned by current user or root, ignoring it.", user_config);
717 goto out_free;
718 }
719
720 if (st.st_size)
721 ret = perf_config_from_file(collect_config, user_config, set);
722
723out_free:
724 free(user_config);
725out:
726 return ret;
727}
728
729struct perf_config_set *perf_config_set__new(void)
730{
731 struct perf_config_set *set = zalloc(sizeof(*set));
732
733 if (set) {
734 INIT_LIST_HEAD(&set->sections);
735 perf_config_set__init(set);
736 }
737
738 return set;
739}
740
741static int perf_config__init(void)
742{
743 if (config_set == NULL)
744 config_set = perf_config_set__new();
745
746 return config_set == NULL;
747}
748
749int perf_config(config_fn_t fn, void *data)
750{
751 int ret = 0;
752 char key[BUFSIZ];
753 struct perf_config_section *section;
754 struct perf_config_item *item;
755
756 if (config_set == NULL && perf_config__init())
757 return -1;
758
759 perf_config_set__for_each_entry(config_set, section, item) {
760 char *value = item->value;
761
762 if (value) {
763 scnprintf(key, sizeof(key), "%s.%s",
764 section->name, item->name);
765 ret = fn(key, value, data);
766 if (ret < 0) {
767 pr_err("Error: wrong config key-value pair %s=%s\n",
768 key, value);
769 /*
770 * Can't be just a 'break', as perf_config_set__for_each_entry()
771 * expands to two nested for() loops.
772 */
773 goto out;
774 }
775 }
776 }
777out:
778 return ret;
779}
780
781void perf_config__exit(void)
782{
783 perf_config_set__delete(config_set);
784 config_set = NULL;
785}
786
787void perf_config__refresh(void)
788{
789 perf_config__exit();
790 perf_config__init();
791}
792
793static void perf_config_item__delete(struct perf_config_item *item)
794{
795 zfree(&item->name);
796 zfree(&item->value);
797 free(item);
798}
799
800static void perf_config_section__purge(struct perf_config_section *section)
801{
802 struct perf_config_item *item, *tmp;
803
804 list_for_each_entry_safe(item, tmp, §ion->items, node) {
805 list_del_init(&item->node);
806 perf_config_item__delete(item);
807 }
808}
809
810static void perf_config_section__delete(struct perf_config_section *section)
811{
812 perf_config_section__purge(section);
813 zfree(§ion->name);
814 free(section);
815}
816
817static void perf_config_set__purge(struct perf_config_set *set)
818{
819 struct perf_config_section *section, *tmp;
820
821 list_for_each_entry_safe(section, tmp, &set->sections, node) {
822 list_del_init(§ion->node);
823 perf_config_section__delete(section);
824 }
825}
826
827void perf_config_set__delete(struct perf_config_set *set)
828{
829 if (set == NULL)
830 return;
831
832 perf_config_set__purge(set);
833 free(set);
834}
835
836/*
837 * Call this to report error for your variable that should not
838 * get a boolean value (i.e. "[my] var" means "true").
839 */
840int config_error_nonbool(const char *var)
841{
842 pr_err("Missing value for '%s'", var);
843 return -1;
844}
845
846void set_buildid_dir(const char *dir)
847{
848 if (dir)
849 scnprintf(buildid_dir, MAXPATHLEN, "%s", dir);
850
851 /* default to $HOME/.debug */
852 if (buildid_dir[0] == '\0') {
853 char *home = getenv("HOME");
854
855 if (home) {
856 snprintf(buildid_dir, MAXPATHLEN, "%s/%s",
857 home, DEBUG_CACHE_DIR);
858 } else {
859 strncpy(buildid_dir, DEBUG_CACHE_DIR, MAXPATHLEN-1);
860 }
861 buildid_dir[MAXPATHLEN-1] = '\0';
862 }
863 /* for communicating with external commands */
864 setenv("PERF_BUILDID_DIR", buildid_dir, 1);
865}