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inotify: fix race
[linux-2.6.22.y-op.git] / scripts / kconfig / confdata.c
blob664fe29dacef5b3f9e0d36353fe0968bccc01347
1 /*
2 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
3 * Released under the terms of the GNU GPL v2.0.
4 */
5
6 #include <sys/stat.h>
7 #include <ctype.h>
8 #include <fcntl.h>
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include <string.h>
12 #include <time.h>
13 #include <unistd.h>
14
15 #define LKC_DIRECT_LINK
16 #include "lkc.h"
17
18 static void conf_warning(const char *fmt, ...)
19 __attribute__ ((format (printf, 1, 2)));
20
21 static const char *conf_filename;
22 static int conf_lineno, conf_warnings, conf_unsaved;
23
24 const char conf_defname[] = "arch/$ARCH/defconfig";
25
26 static void conf_warning(const char *fmt, ...)
27 {
28 va_list ap;
29 va_start(ap, fmt);
30 fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
31 vfprintf(stderr, fmt, ap);
32 fprintf(stderr, "\n");
33 va_end(ap);
34 conf_warnings++;
35 }
36
37 const char *conf_get_configname(void)
38 {
39 char *name = getenv("KCONFIG_CONFIG");
40
41 return name ? name : ".config";
42 }
43
44 static char *conf_expand_value(const char *in)
45 {
46 struct symbol *sym;
47 const char *src;
48 static char res_value[SYMBOL_MAXLENGTH];
49 char *dst, name[SYMBOL_MAXLENGTH];
50
51 res_value[0] = 0;
52 dst = name;
53 while ((src = strchr(in, '$'))) {
54 strncat(res_value, in, src - in);
55 src++;
56 dst = name;
57 while (isalnum(*src) || *src == '_')
58 *dst++ = *src++;
59 *dst = 0;
60 sym = sym_lookup(name, 0);
61 sym_calc_value(sym);
62 strcat(res_value, sym_get_string_value(sym));
63 in = src;
64 }
65 strcat(res_value, in);
66
67 return res_value;
68 }
69
70 char *conf_get_default_confname(void)
71 {
72 struct stat buf;
73 static char fullname[PATH_MAX+1];
74 char *env, *name;
75
76 name = conf_expand_value(conf_defname);
77 env = getenv(SRCTREE);
78 if (env) {
79 sprintf(fullname, "%s/%s", env, name);
80 if (!stat(fullname, &buf))
81 return fullname;
82 }
83 return name;
84 }
85
86 int conf_read_simple(const char *name, int def)
87 {
88 FILE *in = NULL;
89 char line[1024];
90 char *p, *p2;
91 struct symbol *sym;
92 int i, def_flags;
93
94 if (name) {
95 in = zconf_fopen(name);
96 } else {
97 struct property *prop;
98
99 name = conf_get_configname();
100 in = zconf_fopen(name);
101 if (in)
102 goto load;
103 sym_add_change_count(1);
104 if (!sym_defconfig_list)
105 return 1;
106
107 for_all_defaults(sym_defconfig_list, prop) {
108 if (expr_calc_value(prop->visible.expr) == no ||
109 prop->expr->type != E_SYMBOL)
110 continue;
111 name = conf_expand_value(prop->expr->left.sym->name);
112 in = zconf_fopen(name);
113 if (in) {
114 printf(_("#\n"
115 "# using defaults found in %s\n"
116 "#\n"), name);
117 goto load;
118 }
119 }
120 }
121 if (!in)
122 return 1;
123
124 load:
125 conf_filename = name;
126 conf_lineno = 0;
127 conf_warnings = 0;
128 conf_unsaved = 0;
129
130 def_flags = SYMBOL_DEF << def;
131 for_all_symbols(i, sym) {
132 sym->flags |= SYMBOL_CHANGED;
133 sym->flags &= ~(def_flags|SYMBOL_VALID);
134 if (sym_is_choice(sym))
135 sym->flags |= def_flags;
136 switch (sym->type) {
137 case S_INT:
138 case S_HEX:
139 case S_STRING:
140 if (sym->def[def].val)
141 free(sym->def[def].val);
142 default:
143 sym->def[def].val = NULL;
144 sym->def[def].tri = no;
145 }
146 }
147
148 while (fgets(line, sizeof(line), in)) {
149 conf_lineno++;
150 sym = NULL;
151 switch (line[0]) {
152 case '#':
153 if (memcmp(line + 2, "CONFIG_", 7))
154 continue;
155 p = strchr(line + 9, ' ');
156 if (!p)
157 continue;
158 *p++ = 0;
159 if (strncmp(p, "is not set", 10))
160 continue;
161 if (def == S_DEF_USER) {
162 sym = sym_find(line + 9);
163 if (!sym) {
164 conf_warning("trying to assign nonexistent symbol %s", line + 9);
165 break;
166 }
167 } else {
168 sym = sym_lookup(line + 9, 0);
169 if (sym->type == S_UNKNOWN)
170 sym->type = S_BOOLEAN;
171 }
172 if (sym->flags & def_flags) {
173 conf_warning("trying to reassign symbol %s", sym->name);
174 break;
175 }
176 switch (sym->type) {
177 case S_BOOLEAN:
178 case S_TRISTATE:
179 sym->def[def].tri = no;
180 sym->flags |= def_flags;
181 break;
182 default:
183 ;
184 }
185 break;
186 case 'C':
187 if (memcmp(line, "CONFIG_", 7)) {
188 conf_warning("unexpected data");
189 continue;
190 }
191 p = strchr(line + 7, '=');
192 if (!p)
193 continue;
194 *p++ = 0;
195 p2 = strchr(p, '\n');
196 if (p2) {
197 *p2-- = 0;
198 if (*p2 == '\r')
199 *p2 = 0;
200 }
201 if (def == S_DEF_USER) {
202 sym = sym_find(line + 7);
203 if (!sym) {
204 conf_warning("trying to assign nonexistent symbol %s", line + 7);
205 break;
206 }
207 } else {
208 sym = sym_lookup(line + 7, 0);
209 if (sym->type == S_UNKNOWN)
210 sym->type = S_OTHER;
211 }
212 if (sym->flags & def_flags) {
213 conf_warning("trying to reassign symbol %s", sym->name);
214 break;
215 }
216 switch (sym->type) {
217 case S_TRISTATE:
218 if (p[0] == 'm') {
219 sym->def[def].tri = mod;
220 sym->flags |= def_flags;
221 break;
222 }
223 case S_BOOLEAN:
224 if (p[0] == 'y') {
225 sym->def[def].tri = yes;
226 sym->flags |= def_flags;
227 break;
228 }
229 if (p[0] == 'n') {
230 sym->def[def].tri = no;
231 sym->flags |= def_flags;
232 break;
233 }
234 conf_warning("symbol value '%s' invalid for %s", p, sym->name);
235 break;
236 case S_OTHER:
237 if (*p != '"') {
238 for (p2 = p; *p2 && !isspace(*p2); p2++)
239 ;
240 sym->type = S_STRING;
241 goto done;
242 }
243 case S_STRING:
244 if (*p++ != '"')
245 break;
246 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
247 if (*p2 == '"') {
248 *p2 = 0;
249 break;
250 }
251 memmove(p2, p2 + 1, strlen(p2));
252 }
253 if (!p2) {
254 conf_warning("invalid string found");
255 continue;
256 }
257 case S_INT:
258 case S_HEX:
259 done:
260 if (sym_string_valid(sym, p)) {
261 sym->def[def].val = strdup(p);
262 sym->flags |= def_flags;
263 } else {
264 conf_warning("symbol value '%s' invalid for %s", p, sym->name);
265 continue;
266 }
267 break;
268 default:
269 ;
270 }
271 break;
272 case '\r':
273 case '\n':
274 break;
275 default:
276 conf_warning("unexpected data");
277 continue;
278 }
279 if (sym && sym_is_choice_value(sym)) {
280 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
281 switch (sym->def[def].tri) {
282 case no:
283 break;
284 case mod:
285 if (cs->def[def].tri == yes) {
286 conf_warning("%s creates inconsistent choice state", sym->name);
287 cs->flags &= ~def_flags;
288 }
289 break;
290 case yes:
291 if (cs->def[def].tri != no) {
292 conf_warning("%s creates inconsistent choice state", sym->name);
293 cs->flags &= ~def_flags;
294 } else
295 cs->def[def].val = sym;
296 break;
297 }
298 cs->def[def].tri = E_OR(cs->def[def].tri, sym->def[def].tri);
299 }
300 }
301 fclose(in);
302
303 if (modules_sym)
304 sym_calc_value(modules_sym);
305 return 0;
306 }
307
308 int conf_read(const char *name)
309 {
310 struct symbol *sym;
311 struct property *prop;
312 struct expr *e;
313 int i, flags;
314
315 sym_set_change_count(0);
316
317 if (conf_read_simple(name, S_DEF_USER))
318 return 1;
319
320 for_all_symbols(i, sym) {
321 sym_calc_value(sym);
322 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
323 goto sym_ok;
324 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
325 /* check that calculated value agrees with saved value */
326 switch (sym->type) {
327 case S_BOOLEAN:
328 case S_TRISTATE:
329 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
330 break;
331 if (!sym_is_choice(sym))
332 goto sym_ok;
333 default:
334 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
335 goto sym_ok;
336 break;
337 }
338 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
339 /* no previous value and not saved */
340 goto sym_ok;
341 conf_unsaved++;
342 /* maybe print value in verbose mode... */
343 sym_ok:
344 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
345 if (sym->visible == no)
346 sym->flags &= ~SYMBOL_DEF_USER;
347 switch (sym->type) {
348 case S_STRING:
349 case S_INT:
350 case S_HEX:
351 if (!sym_string_within_range(sym, sym->def[S_DEF_USER].val))
352 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
353 default:
354 break;
355 }
356 }
357 if (!sym_is_choice(sym))
358 continue;
359 prop = sym_get_choice_prop(sym);
360 flags = sym->flags;
361 for (e = prop->expr; e; e = e->left.expr)
362 if (e->right.sym->visible != no)
363 flags &= e->right.sym->flags;
364 sym->flags &= flags | ~SYMBOL_DEF_USER;
365 }
366
367 sym_add_change_count(conf_warnings || conf_unsaved);
368
369 return 0;
370 }
371
372 int conf_write(const char *name)
373 {
374 FILE *out;
375 struct symbol *sym;
376 struct menu *menu;
377 const char *basename;
378 char dirname[128], tmpname[128], newname[128];
379 int type, l;
380 const char *str;
381 time_t now;
382 int use_timestamp = 1;
383 char *env;
384
385 dirname[0] = 0;
386 if (name && name[0]) {
387 struct stat st;
388 char *slash;
389
390 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
391 strcpy(dirname, name);
392 strcat(dirname, "/");
393 basename = conf_get_configname();
394 } else if ((slash = strrchr(name, '/'))) {
395 int size = slash - name + 1;
396 memcpy(dirname, name, size);
397 dirname[size] = 0;
398 if (slash[1])
399 basename = slash + 1;
400 else
401 basename = conf_get_configname();
402 } else
403 basename = name;
404 } else
405 basename = conf_get_configname();
406
407 sprintf(newname, "%s%s", dirname, basename);
408 env = getenv("KCONFIG_OVERWRITECONFIG");
409 if (!env || !*env) {
410 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
411 out = fopen(tmpname, "w");
412 } else {
413 *tmpname = 0;
414 out = fopen(newname, "w");
415 }
416 if (!out)
417 return 1;
418
419 sym = sym_lookup("KERNELVERSION", 0);
420 sym_calc_value(sym);
421 time(&now);
422 env = getenv("KCONFIG_NOTIMESTAMP");
423 if (env && *env)
424 use_timestamp = 0;
425
426 fprintf(out, _("#\n"
427 "# Automatically generated make config: don't edit\n"
428 "# Linux kernel version: %s\n"
429 "%s%s"
430 "#\n"),
431 sym_get_string_value(sym),
432 use_timestamp ? "# " : "",
433 use_timestamp ? ctime(&now) : "");
434
435 if (!conf_get_changed())
436 sym_clear_all_valid();
437
438 menu = rootmenu.list;
439 while (menu) {
440 sym = menu->sym;
441 if (!sym) {
442 if (!menu_is_visible(menu))
443 goto next;
444 str = menu_get_prompt(menu);
445 fprintf(out, "\n"
446 "#\n"
447 "# %s\n"
448 "#\n", str);
449 } else if (!(sym->flags & SYMBOL_CHOICE)) {
450 sym_calc_value(sym);
451 if (!(sym->flags & SYMBOL_WRITE))
452 goto next;
453 sym->flags &= ~SYMBOL_WRITE;
454 type = sym->type;
455 if (type == S_TRISTATE) {
456 sym_calc_value(modules_sym);
457 if (modules_sym->curr.tri == no)
458 type = S_BOOLEAN;
459 }
460 switch (type) {
461 case S_BOOLEAN:
462 case S_TRISTATE:
463 switch (sym_get_tristate_value(sym)) {
464 case no:
465 fprintf(out, "# CONFIG_%s is not set\n", sym->name);
466 break;
467 case mod:
468 fprintf(out, "CONFIG_%s=m\n", sym->name);
469 break;
470 case yes:
471 fprintf(out, "CONFIG_%s=y\n", sym->name);
472 break;
473 }
474 break;
475 case S_STRING:
476 str = sym_get_string_value(sym);
477 fprintf(out, "CONFIG_%s=\"", sym->name);
478 while (1) {
479 l = strcspn(str, "\"\\");
480 if (l) {
481 fwrite(str, l, 1, out);
482 str += l;
483 }
484 if (!*str)
485 break;
486 fprintf(out, "\\%c", *str++);
487 }
488 fputs("\"\n", out);
489 break;
490 case S_HEX:
491 str = sym_get_string_value(sym);
492 if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
493 fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
494 break;
495 }
496 case S_INT:
497 str = sym_get_string_value(sym);
498 fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
499 break;
500 }
501 }
502
503 next:
504 if (menu->list) {
505 menu = menu->list;
506 continue;
507 }
508 if (menu->next)
509 menu = menu->next;
510 else while ((menu = menu->parent)) {
511 if (menu->next) {
512 menu = menu->next;
513 break;
514 }
515 }
516 }
517 fclose(out);
518
519 if (*tmpname) {
520 strcat(dirname, basename);
521 strcat(dirname, ".old");
522 rename(newname, dirname);
523 if (rename(tmpname, newname))
524 return 1;
525 }
526
527 printf(_("#\n"
528 "# configuration written to %s\n"
529 "#\n"), newname);
530
531 sym_set_change_count(0);
532
533 return 0;
534 }
535
536 int conf_split_config(void)
537 {
538 char *name, path[128];
539 char *s, *d, c;
540 struct symbol *sym;
541 struct stat sb;
542 int res, i, fd;
543
544 name = getenv("KCONFIG_AUTOCONFIG");
545 if (!name)
546 name = "include/config/auto.conf";
547 conf_read_simple(name, S_DEF_AUTO);
548
549 if (chdir("include/config"))
550 return 1;
551
552 res = 0;
553 for_all_symbols(i, sym) {
554 sym_calc_value(sym);
555 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
556 continue;
557 if (sym->flags & SYMBOL_WRITE) {
558 if (sym->flags & SYMBOL_DEF_AUTO) {
559 /*
560 * symbol has old and new value,
561 * so compare them...
562 */
563 switch (sym->type) {
564 case S_BOOLEAN:
565 case S_TRISTATE:
566 if (sym_get_tristate_value(sym) ==
567 sym->def[S_DEF_AUTO].tri)
568 continue;
569 break;
570 case S_STRING:
571 case S_HEX:
572 case S_INT:
573 if (!strcmp(sym_get_string_value(sym),
574 sym->def[S_DEF_AUTO].val))
575 continue;
576 break;
577 default:
578 break;
579 }
580 } else {
581 /*
582 * If there is no old value, only 'no' (unset)
583 * is allowed as new value.
584 */
585 switch (sym->type) {
586 case S_BOOLEAN:
587 case S_TRISTATE:
588 if (sym_get_tristate_value(sym) == no)
589 continue;
590 break;
591 default:
592 break;
593 }
594 }
595 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
596 /* There is neither an old nor a new value. */
597 continue;
598 /* else
599 * There is an old value, but no new value ('no' (unset)
600 * isn't saved in auto.conf, so the old value is always
601 * different from 'no').
602 */
603
604 /* Replace all '_' and append ".h" */
605 s = sym->name;
606 d = path;
607 while ((c = *s++)) {
608 c = tolower(c);
609 *d++ = (c == '_') ? '/' : c;
610 }
611 strcpy(d, ".h");
612
613 /* Assume directory path already exists. */
614 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
615 if (fd == -1) {
616 if (errno != ENOENT) {
617 res = 1;
618 break;
619 }
620 /*
621 * Create directory components,
622 * unless they exist already.
623 */
624 d = path;
625 while ((d = strchr(d, '/'))) {
626 *d = 0;
627 if (stat(path, &sb) && mkdir(path, 0755)) {
628 res = 1;
629 goto out;
630 }
631 *d++ = '/';
632 }
633 /* Try it again. */
634 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
635 if (fd == -1) {
636 res = 1;
637 break;
638 }
639 }
640 close(fd);
641 }
642 out:
643 if (chdir("../.."))
644 return 1;
645
646 return res;
647 }
648
649 int conf_write_autoconf(void)
650 {
651 struct symbol *sym;
652 const char *str;
653 char *name;
654 FILE *out, *out_h;
655 time_t now;
656 int i, l;
657
658 sym_clear_all_valid();
659
660 file_write_dep("include/config/auto.conf.cmd");
661
662 if (conf_split_config())
663 return 1;
664
665 out = fopen(".tmpconfig", "w");
666 if (!out)
667 return 1;
668
669 out_h = fopen(".tmpconfig.h", "w");
670 if (!out_h) {
671 fclose(out);
672 return 1;
673 }
674
675 sym = sym_lookup("KERNELVERSION", 0);
676 sym_calc_value(sym);
677 time(&now);
678 fprintf(out, "#\n"
679 "# Automatically generated make config: don't edit\n"
680 "# Linux kernel version: %s\n"
681 "# %s"
682 "#\n",
683 sym_get_string_value(sym), ctime(&now));
684 fprintf(out_h, "/*\n"
685 " * Automatically generated C config: don't edit\n"
686 " * Linux kernel version: %s\n"
687 " * %s"
688 " */\n"
689 "#define AUTOCONF_INCLUDED\n",
690 sym_get_string_value(sym), ctime(&now));
691
692 for_all_symbols(i, sym) {
693 sym_calc_value(sym);
694 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
695 continue;
696 switch (sym->type) {
697 case S_BOOLEAN:
698 case S_TRISTATE:
699 switch (sym_get_tristate_value(sym)) {
700 case no:
701 break;
702 case mod:
703 fprintf(out, "CONFIG_%s=m\n", sym->name);
704 fprintf(out_h, "#define CONFIG_%s_MODULE 1\n", sym->name);
705 break;
706 case yes:
707 fprintf(out, "CONFIG_%s=y\n", sym->name);
708 fprintf(out_h, "#define CONFIG_%s 1\n", sym->name);
709 break;
710 }
711 break;
712 case S_STRING:
713 str = sym_get_string_value(sym);
714 fprintf(out, "CONFIG_%s=\"", sym->name);
715 fprintf(out_h, "#define CONFIG_%s \"", sym->name);
716 while (1) {
717 l = strcspn(str, "\"\\");
718 if (l) {
719 fwrite(str, l, 1, out);
720 fwrite(str, l, 1, out_h);
721 str += l;
722 }
723 if (!*str)
724 break;
725 fprintf(out, "\\%c", *str);
726 fprintf(out_h, "\\%c", *str);
727 str++;
728 }
729 fputs("\"\n", out);
730 fputs("\"\n", out_h);
731 break;
732 case S_HEX:
733 str = sym_get_string_value(sym);
734 if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
735 fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
736 fprintf(out_h, "#define CONFIG_%s 0x%s\n", sym->name, str);
737 break;
738 }
739 case S_INT:
740 str = sym_get_string_value(sym);
741 fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
742 fprintf(out_h, "#define CONFIG_%s %s\n", sym->name, str);
743 break;
744 default:
745 break;
746 }
747 }
748 fclose(out);
749 fclose(out_h);
750
751 name = getenv("KCONFIG_AUTOHEADER");
752 if (!name)
753 name = "include/linux/autoconf.h";
754 if (rename(".tmpconfig.h", name))
755 return 1;
756 name = getenv("KCONFIG_AUTOCONFIG");
757 if (!name)
758 name = "include/config/auto.conf";
759 /*
760 * This must be the last step, kbuild has a dependency on auto.conf
761 * and this marks the successful completion of the previous steps.
762 */
763 if (rename(".tmpconfig", name))
764 return 1;
765
766 return 0;
767 }
768
769 static int sym_change_count;
770 static void (*conf_changed_callback)(void);
771
772 void sym_set_change_count(int count)
773 {
774 int _sym_change_count = sym_change_count;
775 sym_change_count = count;
776 if (conf_changed_callback &&
777 (bool)_sym_change_count != (bool)count)
778 conf_changed_callback();
779 }
780
781 void sym_add_change_count(int count)
782 {
783 sym_set_change_count(count + sym_change_count);
784 }
785
786 bool conf_get_changed(void)
787 {
788 return sym_change_count;
789 }
790
791 void conf_set_changed_callback(void (*fn)(void))
792 {
793 conf_changed_callback = fn;
794 }
linux v2.6.22.y-op