Commit | Line | Data |
---|---|---|
2f1de3dd | 1 | /* update-game-score.c --- Update a score file |
294981c7 | 2 | |
ba318903 | 3 | Copyright (C) 2002-2014 Free Software Foundation, Inc. |
294981c7 GM |
4 | |
5 | Author: Colin Walters <walters@debian.org> | |
2f1de3dd CW |
6 | |
7 | This file is part of GNU Emacs. | |
8 | ||
294981c7 | 9 | GNU Emacs is free software: you can redistribute it and/or modify |
2f1de3dd | 10 | it under the terms of the GNU General Public License as published by |
294981c7 GM |
11 | the Free Software Foundation, either version 3 of the License, or |
12 | (at your option) any later version. | |
2f1de3dd CW |
13 | |
14 | GNU Emacs is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
294981c7 GM |
20 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
21 | ||
2f1de3dd | 22 | |
89cc1591 | 23 | /* This program allows a game to securely and atomically update a |
8eec804f CW |
24 | score file. It should be installed setuid, owned by an appropriate |
25 | user like `games'. | |
26 | ||
27 | Alternatively, it can be compiled without HAVE_SHARED_GAME_DIR | |
28 | defined, and in that case it will store scores in the user's home | |
29 | directory (it should NOT be setuid). | |
2f1de3dd | 30 | |
294981c7 | 31 | Created 2002/03/22. |
2f1de3dd CW |
32 | */ |
33 | ||
c42d6dbd EZ |
34 | #include <config.h> |
35 | ||
2f1de3dd CW |
36 | #include <unistd.h> |
37 | #include <errno.h> | |
d70efef4 | 38 | #include <inttypes.h> |
0c6d656d | 39 | #include <limits.h> |
d70efef4 | 40 | #include <stdbool.h> |
2f1de3dd CW |
41 | #include <string.h> |
42 | #include <stdlib.h> | |
43 | #include <stdio.h> | |
44 | #include <time.h> | |
cd553ffb | 45 | #include <pwd.h> |
2f1de3dd CW |
46 | #include <ctype.h> |
47 | #include <fcntl.h> | |
48 | #include <sys/stat.h> | |
15142f27 | 49 | #include <getopt.h> |
5b400482 | 50 | |
7c4026b6 EZ |
51 | #ifdef WINDOWSNT |
52 | #include "ntlib.h" | |
53 | #endif | |
54 | ||
d70efef4 PE |
55 | #ifndef min |
56 | # define min(a,b) ((a) < (b) ? (a) : (b)) | |
57 | #endif | |
58 | ||
2f1de3dd | 59 | #define MAX_ATTEMPTS 5 |
8eec804f | 60 | #define MAX_DATA_LEN 1024 |
5795b420 | 61 | |
845ca893 | 62 | static _Noreturn void |
873fbd0b | 63 | usage (int err) |
2f1de3dd | 64 | { |
ec3b5374 | 65 | fprintf (stdout, "Usage: update-game-score [-m MAX] [-r] [-d DIR] game/scorefile SCORE DATA\n"); |
a5d107f3 RS |
66 | fprintf (stdout, " update-game-score -h\n"); |
67 | fprintf (stdout, " -h\t\tDisplay this help.\n"); | |
68 | fprintf (stdout, " -m MAX\t\tLimit the maximum number of scores to MAX.\n"); | |
69 | fprintf (stdout, " -r\t\tSort the scores in increasing order.\n"); | |
70 | fprintf (stdout, " -d DIR\t\tStore scores in DIR (only if not setuid).\n"); | |
71 | exit (err); | |
2f1de3dd CW |
72 | } |
73 | ||
b23b5a5b PE |
74 | static int lock_file (const char *filename, void **state); |
75 | static int unlock_file (const char *filename, void *state); | |
2f1de3dd CW |
76 | |
77 | struct score_entry | |
78 | { | |
d70efef4 | 79 | intmax_t score; |
cd553ffb | 80 | char *username; |
2f1de3dd CW |
81 | char *data; |
82 | }; | |
83 | ||
d70efef4 PE |
84 | #define MAX_SCORES min (PTRDIFF_MAX, SIZE_MAX / sizeof (struct score_entry)) |
85 | ||
b23b5a5b | 86 | static int read_scores (const char *filename, struct score_entry **scores, |
d70efef4 PE |
87 | ptrdiff_t *count, ptrdiff_t *alloc); |
88 | static int push_score (struct score_entry **scores, ptrdiff_t *count, | |
89 | ptrdiff_t *size, struct score_entry const *newscore); | |
90 | static void sort_scores (struct score_entry *scores, ptrdiff_t count, | |
91 | bool reverse); | |
b23b5a5b | 92 | static int write_scores (const char *filename, |
d70efef4 | 93 | const struct score_entry *scores, ptrdiff_t count); |
cf398788 | 94 | |
845ca893 | 95 | static _Noreturn void |
873fbd0b | 96 | lose (const char *msg) |
cf398788 | 97 | { |
a5d107f3 | 98 | fprintf (stderr, "%s\n", msg); |
65396510 | 99 | exit (EXIT_FAILURE); |
cf398788 | 100 | } |
2f1de3dd | 101 | |
845ca893 | 102 | static _Noreturn void |
873fbd0b | 103 | lose_syserr (const char *msg) |
d99fabf0 | 104 | { |
a5d107f3 | 105 | fprintf (stderr, "%s: %s\n", msg, strerror (errno)); |
65396510 | 106 | exit (EXIT_FAILURE); |
d99fabf0 CW |
107 | } |
108 | ||
b23b5a5b | 109 | static char * |
f57e2426 | 110 | get_user_id (void) |
cd553ffb | 111 | { |
a5d107f3 | 112 | struct passwd *buf = getpwuid (getuid ()); |
d70efef4 | 113 | if (!buf || strchr (buf->pw_name, ' ') || strchr (buf->pw_name, '\n')) |
cd553ffb | 114 | { |
d70efef4 PE |
115 | intmax_t uid = getuid (); |
116 | char *name = malloc (sizeof uid * CHAR_BIT / 3 + 4); | |
0c6d656d | 117 | if (name) |
d70efef4 | 118 | sprintf (name, "%"PRIdMAX, uid); |
cd553ffb CW |
119 | return name; |
120 | } | |
121 | return buf->pw_name; | |
122 | } | |
123 | ||
b23b5a5b | 124 | static const char * |
d70efef4 | 125 | get_prefix (bool running_suid, const char *user_prefix) |
8eec804f | 126 | { |
d99fabf0 | 127 | if (!running_suid && user_prefix == NULL) |
a5d107f3 | 128 | lose ("Not using a shared game directory, and no prefix given."); |
d99fabf0 CW |
129 | if (running_suid) |
130 | { | |
131 | #ifdef HAVE_SHARED_GAME_DIR | |
132 | return HAVE_SHARED_GAME_DIR; | |
133 | #else | |
a5d107f3 | 134 | lose ("This program was compiled without HAVE_SHARED_GAME_DIR,\n and should not be suid."); |
d99fabf0 CW |
135 | #endif |
136 | } | |
137 | return user_prefix; | |
8eec804f CW |
138 | } |
139 | ||
2f1de3dd | 140 | int |
873fbd0b | 141 | main (int argc, char **argv) |
2f1de3dd | 142 | { |
d70efef4 PE |
143 | int c; |
144 | bool running_suid; | |
2f1de3dd | 145 | void *lockstate; |
d70efef4 PE |
146 | char *scorefile; |
147 | char *nl; | |
988e88ab | 148 | const char *prefix, *user_prefix = NULL; |
2f1de3dd CW |
149 | struct stat buf; |
150 | struct score_entry *scores; | |
d70efef4 PE |
151 | struct score_entry newscore; |
152 | bool reverse = false; | |
153 | ptrdiff_t scorecount, scorealloc; | |
154 | ptrdiff_t max_scores = MAX_SCORES; | |
2f1de3dd | 155 | |
a5d107f3 | 156 | srand (time (0)); |
2f1de3dd | 157 | |
a5d107f3 | 158 | while ((c = getopt (argc, argv, "hrm:d:")) != -1) |
2f1de3dd CW |
159 | switch (c) |
160 | { | |
161 | case 'h': | |
65396510 | 162 | usage (EXIT_SUCCESS); |
2f1de3dd | 163 | break; |
d99fabf0 CW |
164 | case 'd': |
165 | user_prefix = optarg; | |
166 | break; | |
2f1de3dd CW |
167 | case 'r': |
168 | reverse = 1; | |
169 | break; | |
170 | case 'm': | |
d70efef4 PE |
171 | { |
172 | intmax_t m = strtoimax (optarg, 0, 10); | |
173 | if (m < 0) | |
174 | usage (EXIT_FAILURE); | |
175 | max_scores = min (m, MAX_SCORES); | |
176 | } | |
2f1de3dd CW |
177 | break; |
178 | default: | |
65396510 | 179 | usage (EXIT_FAILURE); |
2f1de3dd CW |
180 | } |
181 | ||
d70efef4 | 182 | if (argc - optind != 3) |
65396510 | 183 | usage (EXIT_FAILURE); |
5795b420 | 184 | |
a5d107f3 | 185 | running_suid = (getuid () != geteuid ()); |
5795b420 | 186 | |
a5d107f3 | 187 | prefix = get_prefix (running_suid, user_prefix); |
8eec804f | 188 | |
a5d107f3 | 189 | scorefile = malloc (strlen (prefix) + strlen (argv[optind]) + 2); |
2f1de3dd | 190 | if (!scorefile) |
a5d107f3 | 191 | lose_syserr ("Couldn't allocate score file"); |
8eec804f | 192 | |
a5d107f3 RS |
193 | strcpy (scorefile, prefix); |
194 | strcat (scorefile, "/"); | |
195 | strcat (scorefile, argv[optind]); | |
d99fabf0 | 196 | |
d70efef4 PE |
197 | newscore.score = strtoimax (argv[optind + 1], 0, 10); |
198 | ||
199 | newscore.data = argv[optind + 2]; | |
200 | if (strlen (newscore.data) > MAX_DATA_LEN) | |
201 | newscore.data[MAX_DATA_LEN] = '\0'; | |
202 | nl = strchr (newscore.data, '\n'); | |
203 | if (nl) | |
204 | *nl = '\0'; | |
205 | ||
206 | newscore.username = get_user_id (); | |
207 | if (! newscore.username) | |
a5d107f3 | 208 | lose_syserr ("Couldn't determine user id"); |
177c0ea7 | 209 | |
a5d107f3 RS |
210 | if (stat (scorefile, &buf) < 0) |
211 | lose_syserr ("Failed to access scores file"); | |
177c0ea7 | 212 | |
a5d107f3 RS |
213 | if (lock_file (scorefile, &lockstate) < 0) |
214 | lose_syserr ("Failed to lock scores file"); | |
177c0ea7 | 215 | |
d70efef4 | 216 | if (read_scores (scorefile, &scores, &scorecount, &scorealloc) < 0) |
2f1de3dd | 217 | { |
a5d107f3 RS |
218 | unlock_file (scorefile, lockstate); |
219 | lose_syserr ("Failed to read scores file"); | |
2f1de3dd | 220 | } |
d70efef4 PE |
221 | if (push_score (&scores, &scorecount, &scorealloc, &newscore) < 0) |
222 | { | |
223 | unlock_file (scorefile, lockstate); | |
224 | lose_syserr ("Failed to add score"); | |
225 | } | |
24e9e996 | 226 | sort_scores (scores, scorecount, reverse); |
8eec804f | 227 | /* Limit the number of scores. If we're using reverse sorting, then |
f0d80d43 PE |
228 | also increment the beginning of the array, to skip over the |
229 | *smallest* scores. Otherwise, just decrementing the number of | |
230 | scores suffices, since the smallest is at the end. */ | |
d70efef4 | 231 | if (scorecount > max_scores) |
f0d80d43 PE |
232 | { |
233 | if (reverse) | |
d70efef4 PE |
234 | scores += scorecount - max_scores; |
235 | scorecount = max_scores; | |
f0d80d43 | 236 | } |
a5d107f3 | 237 | if (write_scores (scorefile, scores, scorecount) < 0) |
2f1de3dd | 238 | { |
a5d107f3 RS |
239 | unlock_file (scorefile, lockstate); |
240 | lose_syserr ("Failed to write scores file"); | |
2f1de3dd | 241 | } |
d70efef4 PE |
242 | if (unlock_file (scorefile, lockstate) < 0) |
243 | lose_syserr ("Failed to unlock scores file"); | |
65396510 | 244 | exit (EXIT_SUCCESS); |
2f1de3dd CW |
245 | } |
246 | ||
b23b5a5b | 247 | static int |
873fbd0b | 248 | read_score (FILE *f, struct score_entry *score) |
2f1de3dd CW |
249 | { |
250 | int c; | |
98a428c1 EZ |
251 | if ((c = getc (f)) != EOF) |
252 | ungetc (c, f); | |
a5d107f3 | 253 | if (feof (f)) |
2f1de3dd | 254 | return 1; |
98a428c1 | 255 | for (score->score = 0; (c = getc (f)) != EOF && isdigit (c); ) |
cd553ffb | 256 | { |
d70efef4 PE |
257 | if (INTMAX_MAX / 10 < score->score) |
258 | return -1; | |
cd553ffb | 259 | score->score *= 10; |
d70efef4 PE |
260 | if (INTMAX_MAX - (c - '0') < score->score) |
261 | return -1; | |
262 | score->score += c - '0'; | |
cd553ffb | 263 | } |
a5d107f3 RS |
264 | while ((c = getc (f)) != EOF |
265 | && isspace (c)) | |
cd553ffb CW |
266 | ; |
267 | if (c == EOF) | |
268 | return -1; | |
a5d107f3 | 269 | ungetc (c, f); |
cd553ffb CW |
270 | #ifdef HAVE_GETDELIM |
271 | { | |
7605f1bd | 272 | size_t count = 0; |
dc217d01 | 273 | score->username = 0; |
a5d107f3 | 274 | if (getdelim (&score->username, &count, ' ', f) < 1 |
cd553ffb CW |
275 | || score->username == NULL) |
276 | return -1; | |
1d4328ff | 277 | /* Trim the space */ |
a5d107f3 | 278 | score->username[strlen (score->username)-1] = '\0'; |
2f1de3dd | 279 | } |
cd553ffb CW |
280 | #else |
281 | { | |
d70efef4 PE |
282 | ptrdiff_t unameread = 0; |
283 | ptrdiff_t unamelen = 30; | |
a5d107f3 | 284 | char *username = malloc (unamelen); |
f5bceaf8 CW |
285 | if (!username) |
286 | return -1; | |
177c0ea7 | 287 | |
d70efef4 | 288 | while ((c = getc (f)) != EOF && c != ' ') |
cd553ffb | 289 | { |
d70efef4 PE |
290 | if (unameread >= unamelen - 1) |
291 | { | |
292 | ptrdiff_t unamelen_max = min (PTRDIFF_MAX, SIZE_MAX); | |
293 | if (unamelen <= unamelen_max / 2) | |
294 | unamelen *= 2; | |
295 | else if (unamelen < unamelen_max) | |
296 | unamelen = unamelen_max; | |
297 | else | |
298 | { | |
299 | errno = ENOMEM; | |
300 | return -1; | |
301 | } | |
302 | username = realloc (username, unamelen); | |
303 | if (!username) | |
304 | return -1; | |
305 | } | |
cd553ffb CW |
306 | username[unameread] = c; |
307 | unameread++; | |
308 | } | |
177c0ea7 | 309 | if (c == EOF) |
f5bceaf8 CW |
310 | return -1; |
311 | username[unameread] = '\0'; | |
cd553ffb CW |
312 | score->username = username; |
313 | } | |
314 | #endif | |
2f1de3dd CW |
315 | #ifdef HAVE_GETLINE |
316 | score->data = NULL; | |
7605f1bd | 317 | errno = 0; |
2f1de3dd | 318 | { |
7605f1bd | 319 | size_t len; |
a5d107f3 | 320 | if (getline (&score->data, &len, f) < 0) |
2f1de3dd | 321 | return -1; |
a5d107f3 | 322 | score->data[strlen (score->data)-1] = '\0'; |
2f1de3dd CW |
323 | } |
324 | #else | |
cd553ffb | 325 | { |
d70efef4 PE |
326 | ptrdiff_t cur = 0; |
327 | ptrdiff_t len = 16; | |
a5d107f3 | 328 | char *buf = malloc (len); |
cd553ffb CW |
329 | if (!buf) |
330 | return -1; | |
a5d107f3 | 331 | while ((c = getc (f)) != EOF |
f5bceaf8 | 332 | && c != '\n') |
cd553ffb CW |
333 | { |
334 | if (cur >= len-1) | |
335 | { | |
d70efef4 PE |
336 | if (min (PTRDIFF_MAX, SIZE_MAX) / 2 < len) |
337 | { | |
338 | errno = ENOMEM; | |
339 | return -1; | |
340 | } | |
a5d107f3 | 341 | if (!(buf = realloc (buf, len *= 2))) |
cd553ffb CW |
342 | return -1; |
343 | } | |
344 | buf[cur] = c; | |
345 | cur++; | |
346 | } | |
347 | score->data = buf; | |
5795b420 | 348 | score->data[cur] = '\0'; |
cd553ffb | 349 | } |
2f1de3dd | 350 | #endif |
2f1de3dd CW |
351 | return 0; |
352 | } | |
353 | ||
b23b5a5b | 354 | static int |
d70efef4 PE |
355 | read_scores (const char *filename, struct score_entry **scores, |
356 | ptrdiff_t *count, ptrdiff_t *alloc) | |
2f1de3dd | 357 | { |
d70efef4 PE |
358 | int readval = -1; |
359 | ptrdiff_t scorecount = 0; | |
360 | ptrdiff_t cursize = 0; | |
361 | struct score_entry *ret = 0; | |
362 | struct score_entry entry; | |
a5d107f3 | 363 | FILE *f = fopen (filename, "r"); |
98a428c1 | 364 | int retval = -1; |
177c0ea7 | 365 | if (!f) |
2f1de3dd | 366 | return -1; |
d70efef4 PE |
367 | while ((readval = read_score (f, &entry)) == 0) |
368 | if (push_score (&ret, &scorecount, &cursize, &entry) < 0) | |
369 | return -1; | |
dc217d01 | 370 | if (readval > 0 && fclose (f) == 0) |
98a428c1 EZ |
371 | { |
372 | *count = scorecount; | |
d70efef4 | 373 | *alloc = cursize; |
98a428c1 EZ |
374 | *scores = ret; |
375 | retval = 0; | |
376 | } | |
98a428c1 | 377 | return retval; |
2f1de3dd CW |
378 | } |
379 | ||
b23b5a5b | 380 | static int |
873fbd0b | 381 | score_compare (const void *a, const void *b) |
2f1de3dd CW |
382 | { |
383 | const struct score_entry *sa = (const struct score_entry *) a; | |
384 | const struct score_entry *sb = (const struct score_entry *) b; | |
385 | return (sb->score > sa->score) - (sb->score < sa->score); | |
386 | } | |
387 | ||
b23b5a5b | 388 | static int |
873fbd0b | 389 | score_compare_reverse (const void *a, const void *b) |
2f1de3dd | 390 | { |
d70efef4 | 391 | return score_compare (b, a); |
2f1de3dd CW |
392 | } |
393 | ||
394 | int | |
d70efef4 PE |
395 | push_score (struct score_entry **scores, ptrdiff_t *count, ptrdiff_t *size, |
396 | struct score_entry const *newscore) | |
2f1de3dd | 397 | { |
d70efef4 PE |
398 | struct score_entry *newscores = *scores; |
399 | if (*count == *size) | |
400 | { | |
401 | ptrdiff_t newsize = *size; | |
402 | if (newsize <= 0) | |
403 | newsize = 1; | |
404 | else if (newsize <= MAX_SCORES / 2) | |
405 | newsize *= 2; | |
406 | else if (newsize < MAX_SCORES) | |
407 | newsize = MAX_SCORES; | |
408 | else | |
409 | { | |
410 | errno = ENOMEM; | |
411 | return -1; | |
412 | } | |
413 | newscores = realloc (newscores, sizeof *newscores * newsize); | |
414 | if (!newscores) | |
415 | return -1; | |
416 | *scores = newscores; | |
417 | *size = newsize; | |
418 | } | |
419 | newscores[*count] = *newscore; | |
2f1de3dd | 420 | (*count) += 1; |
2f1de3dd CW |
421 | return 0; |
422 | } | |
177c0ea7 | 423 | |
b23b5a5b | 424 | static void |
d70efef4 | 425 | sort_scores (struct score_entry *scores, ptrdiff_t count, bool reverse) |
2f1de3dd | 426 | { |
d70efef4 PE |
427 | qsort (scores, count, sizeof *scores, |
428 | reverse ? score_compare_reverse : score_compare); | |
2f1de3dd CW |
429 | } |
430 | ||
b23b5a5b | 431 | static int |
d70efef4 PE |
432 | write_scores (const char *filename, const struct score_entry *scores, |
433 | ptrdiff_t count) | |
2f1de3dd | 434 | { |
e0fdb694 | 435 | int fd; |
177c0ea7 | 436 | FILE *f; |
d70efef4 | 437 | ptrdiff_t i; |
a5d107f3 | 438 | char *tempfile = malloc (strlen (filename) + strlen (".tempXXXXXX") + 1); |
2f1de3dd CW |
439 | if (!tempfile) |
440 | return -1; | |
a5d107f3 RS |
441 | strcpy (tempfile, filename); |
442 | strcat (tempfile, ".tempXXXXXX"); | |
e0fdb694 PE |
443 | fd = mkostemp (tempfile, 0); |
444 | if (fd < 0) | |
445 | return -1; | |
dc217d01 PE |
446 | if (fchmod (fd, 0644) != 0) |
447 | return -1; | |
e0fdb694 PE |
448 | f = fdopen (fd, "w"); |
449 | if (! f) | |
2f1de3dd CW |
450 | return -1; |
451 | for (i = 0; i < count; i++) | |
d70efef4 PE |
452 | if (fprintf (f, "%"PRIdMAX" %s %s\n", |
453 | scores[i].score, scores[i].username, scores[i].data) | |
454 | < 0) | |
2f1de3dd | 455 | return -1; |
dc217d01 | 456 | if (fclose (f) != 0) |
2f1de3dd | 457 | return -1; |
dc217d01 | 458 | if (rename (tempfile, filename) != 0) |
2f1de3dd | 459 | return -1; |
8eec804f | 460 | return 0; |
2f1de3dd | 461 | } |
177c0ea7 | 462 | |
b23b5a5b | 463 | static int |
873fbd0b | 464 | lock_file (const char *filename, void **state) |
2f1de3dd CW |
465 | { |
466 | int fd; | |
7c4f6873 | 467 | struct stat buf; |
2f1de3dd | 468 | int attempts = 0; |
988e88ab | 469 | const char *lockext = ".lockfile"; |
a5d107f3 | 470 | char *lockpath = malloc (strlen (filename) + strlen (lockext) + 60); |
2f1de3dd CW |
471 | if (!lockpath) |
472 | return -1; | |
a5d107f3 RS |
473 | strcpy (lockpath, filename); |
474 | strcat (lockpath, lockext); | |
2f1de3dd CW |
475 | *state = lockpath; |
476 | trylock: | |
477 | attempts++; | |
dc217d01 | 478 | /* If the lock is over an hour old, delete it. */ |
a5d107f3 | 479 | if (stat (lockpath, &buf) == 0 |
dc217d01 | 480 | && 60 * 60 < time (0) - buf.st_ctime) |
a5d107f3 | 481 | unlink (lockpath); |
00a7e408 RS |
482 | fd = open (lockpath, O_CREAT | O_EXCL, 0600); |
483 | if (fd < 0) | |
2f1de3dd CW |
484 | { |
485 | if (errno == EEXIST) | |
486 | { | |
487 | /* Break the lock; we won't corrupt the file, but we might | |
488 | lose some scores. */ | |
489 | if (attempts > MAX_ATTEMPTS) | |
7c4f6873 | 490 | { |
a5d107f3 | 491 | unlink (lockpath); |
7c4f6873 CW |
492 | attempts = 0; |
493 | } | |
a5d107f3 | 494 | sleep ((rand () % 2)+1); |
2f1de3dd CW |
495 | goto trylock; |
496 | } | |
497 | else | |
498 | return -1; | |
499 | } | |
a5d107f3 | 500 | close (fd); |
2f1de3dd CW |
501 | return 0; |
502 | } | |
177c0ea7 | 503 | |
b23b5a5b | 504 | static int |
873fbd0b | 505 | unlock_file (const char *filename, void *state) |
2f1de3dd CW |
506 | { |
507 | char *lockpath = (char *) state; | |
2f1de3dd | 508 | int saved_errno = errno; |
d70efef4 PE |
509 | int ret = unlink (lockpath); |
510 | int unlink_errno = errno; | |
a5d107f3 | 511 | free (lockpath); |
d70efef4 | 512 | errno = ret < 0 ? unlink_errno : saved_errno; |
2f1de3dd CW |
513 | return ret; |
514 | } | |
ab5796a9 | 515 | |
65396510 | 516 | /* update-game-score.c ends here */ |