Commit | Line | Data |
---|---|---|
059ec3d9 PH |
1 | /* A program to lock a file exactly as Exim would, for investigation of |
2 | interlocking problems. | |
3 | ||
4 | Options: -fcntl use fcntl() lock | |
5 | -flock use flock() lock | |
6 | -lockfile use lock file | |
7 | -mbx use mbx locking rules, with either fcntl() or flock() | |
8 | ||
9 | Default is -fcntl -lockfile. | |
10 | ||
11 | Argument: the name of the lock file | |
80fea873 JH |
12 | |
13 | Copyright (c) The Exim Maintainers 2016 | |
059ec3d9 PH |
14 | */ |
15 | ||
16 | #include "os.h" | |
17 | ||
18 | #include <stdio.h> | |
19 | #include <stdlib.h> | |
20 | #include <string.h> | |
21 | #include <signal.h> | |
22 | #include <errno.h> | |
23 | #include <time.h> | |
24 | #include <netdb.h> | |
25 | #include <fcntl.h> | |
26 | #include <unistd.h> | |
27 | #include <utime.h> | |
28 | #include <sys/utsname.h> | |
29 | #include <sys/stat.h> | |
30 | #include <sys/file.h> | |
31 | #include <pwd.h> | |
32 | ||
33 | /* Not all systems have flock() available. Those that do must define LOCK_SH | |
34 | in sys/file.h. */ | |
35 | ||
36 | #ifndef LOCK_SH | |
37 | #define NO_FLOCK | |
38 | #endif | |
39 | ||
40 | ||
41 | typedef int BOOL; | |
42 | #define FALSE 0 | |
43 | #define TRUE 1 | |
44 | ||
45 | ||
46 | /* Flag for timeout signal handler */ | |
47 | ||
48 | static int sigalrm_seen = FALSE; | |
49 | ||
50 | ||
51 | /* We need to pull in strerror() and os_non_restarting_signal() from the | |
52 | os.c source, if they are required for this OS. However, we don't need any of | |
53 | the other stuff in os.c, so force the other macros to omit it. */ | |
54 | ||
55 | #ifndef OS_RESTARTING_SIGNAL | |
56 | #define OS_RESTARTING_SIGNAL | |
57 | #endif | |
58 | ||
59 | #ifndef OS_STRSIGNAL | |
60 | #define OS_STRSIGNAL | |
61 | #endif | |
62 | ||
63 | #ifndef OS_STREXIT | |
64 | #define OS_STREXIT | |
65 | #endif | |
66 | ||
67 | #ifndef OS_LOAD_AVERAGE | |
68 | #define OS_LOAD_AVERAGE | |
69 | #endif | |
70 | ||
71 | #ifndef FIND_RUNNING_INTERFACES | |
72 | #define FIND_RUNNING_INTERFACES | |
73 | #endif | |
74 | ||
5bfb4cdf PP |
75 | #ifndef OS_GET_DNS_RESOLVER_RES |
76 | #define OS_GET_DNS_RESOLVER_RES | |
77 | #endif | |
78 | ||
059ec3d9 PH |
79 | #include "../src/os.c" |
80 | ||
81 | ||
82 | ||
83 | /************************************************* | |
84 | * Timeout handler * | |
85 | *************************************************/ | |
86 | ||
87 | static void | |
88 | sigalrm_handler(int sig) | |
89 | { | |
90 | sig = sig; /* Keep picky compilers happy */ | |
91 | sigalrm_seen = TRUE; | |
92 | } | |
93 | ||
94 | ||
95 | ||
96 | /************************************************* | |
97 | * Give usage and die * | |
98 | *************************************************/ | |
99 | ||
100 | static void | |
101 | usage(void) | |
102 | { | |
103 | printf("usage: exim_lock [-v] [-q] [-lockfile] [-fcntl] [-flock] [-mbx]\n" | |
104 | " [-retries <n>] [-interval <n>] [-timeout <n>] [-restore-times]\n" | |
105 | " <file name> [command]\n"); | |
106 | exit(1); | |
107 | } | |
108 | ||
109 | ||
110 | ||
111 | /************************************************* | |
112 | * Apply a lock to a file descriptor * | |
113 | *************************************************/ | |
114 | ||
115 | static int | |
116 | apply_lock(int fd, int fcntltype, BOOL dofcntl, int fcntltime, BOOL doflock, | |
117 | int flocktime) | |
118 | { | |
119 | int yield = 0; | |
120 | int save_errno; | |
121 | struct flock lock_data; | |
122 | lock_data.l_type = fcntltype; | |
123 | lock_data.l_whence = lock_data.l_start = lock_data.l_len = 0; | |
124 | ||
125 | sigalrm_seen = FALSE; | |
126 | ||
127 | if (dofcntl) | |
128 | { | |
129 | if (fcntltime > 0) | |
130 | { | |
131 | os_non_restarting_signal(SIGALRM, sigalrm_handler); | |
132 | alarm(fcntltime); | |
133 | yield = fcntl(fd, F_SETLKW, &lock_data); | |
134 | save_errno = errno; | |
135 | alarm(0); | |
136 | errno = save_errno; | |
137 | } | |
138 | else yield = fcntl(fd, F_SETLK, &lock_data); | |
139 | if (yield < 0) printf("exim_lock: fcntl() failed: %s\n", strerror(errno)); | |
140 | } | |
141 | ||
142 | #ifndef NO_FLOCK | |
143 | if (doflock && (yield >= 0)) | |
144 | { | |
145 | int flocktype = (fcntltype == F_WRLCK)? LOCK_EX : LOCK_SH; | |
146 | if (flocktime > 0) | |
147 | { | |
148 | os_non_restarting_signal(SIGALRM, sigalrm_handler); | |
149 | alarm(flocktime); | |
150 | yield = flock(fd, flocktype); | |
151 | save_errno = errno; | |
152 | alarm(0); | |
153 | errno = save_errno; | |
154 | } | |
155 | else yield = flock(fd, flocktype | LOCK_NB); | |
156 | if (yield < 0) printf("exim_lock: flock() failed: %s\n", strerror(errno)); | |
157 | } | |
158 | #endif | |
159 | ||
160 | return yield; | |
161 | } | |
162 | ||
163 | ||
164 | ||
165 | /************************************************* | |
166 | * The exim_lock program * | |
167 | *************************************************/ | |
168 | ||
169 | int main(int argc, char **argv) | |
170 | { | |
171 | int lock_retries = 10; | |
172 | int lock_interval = 3; | |
173 | int lock_fcntl_timeout = 0; | |
174 | int lock_flock_timeout = 0; | |
175 | int i, j, len; | |
176 | int fd = -1; | |
177 | int hd = -1; | |
178 | int md = -1; | |
179 | int yield = 0; | |
19050083 | 180 | time_t now = time(NULL); |
059ec3d9 PH |
181 | BOOL use_lockfile = FALSE; |
182 | BOOL use_fcntl = FALSE; | |
183 | BOOL use_flock = FALSE; | |
184 | BOOL use_mbx = FALSE; | |
185 | BOOL verbose = FALSE; | |
186 | BOOL quiet = FALSE; | |
187 | BOOL restore_times = FALSE; | |
188 | char *filename; | |
189 | char *lockname = NULL, *hitchname = NULL; | |
1ba28e2b PP |
190 | char *primary_hostname; |
191 | const char *command; | |
059ec3d9 PH |
192 | struct utsname s; |
193 | char buffer[256]; | |
194 | char tempname[256]; | |
195 | ||
196 | /* Decode options */ | |
197 | ||
198 | for (i = 1; i < argc; i++) | |
199 | { | |
200 | char *arg = argv[i]; | |
201 | if (*arg != '-') break; | |
202 | if (strcmp(arg, "-fcntl") == 0) use_fcntl = TRUE; | |
203 | else if (strcmp(arg, "-flock") == 0) use_flock = TRUE; | |
204 | else if (strcmp(arg, "-lockfile") == 0) use_lockfile = TRUE; | |
205 | else if (strcmp(arg, "-mbx") == 0) use_mbx = TRUE; | |
206 | else if (strcmp(arg, "-v") == 0) verbose = TRUE; | |
207 | else if (strcmp(arg, "-q") == 0) quiet = TRUE; | |
208 | else if (strcmp(arg, "-restore-times") == 0) restore_times = TRUE; | |
209 | else if (++i < argc) | |
210 | { | |
211 | int value = atoi(argv[i]); | |
212 | if (strcmp(arg, "-retries") == 0) lock_retries = value; | |
213 | else if (strcmp(arg, "-interval") == 0) lock_interval = value; | |
214 | else if (strcmp(arg, "-timeout") == 0) | |
215 | lock_fcntl_timeout = lock_flock_timeout = value; | |
216 | else usage(); | |
217 | } | |
218 | else usage(); | |
219 | } | |
220 | ||
c99b02de | 221 | if (quiet) verbose = FALSE; |
059ec3d9 PH |
222 | |
223 | /* Can't use flock() if the OS doesn't provide it */ | |
224 | ||
225 | #ifdef NO_FLOCK | |
226 | if (use_flock) | |
227 | { | |
228 | printf("exim_lock: can't use flock() because it was not available in the\n" | |
229 | " operating system when exim_lock was compiled\n"); | |
230 | exit(1); | |
231 | } | |
232 | #endif | |
233 | ||
234 | /* Default is to use lockfiles and fcntl(). */ | |
235 | ||
236 | if (!use_lockfile && !use_fcntl && !use_flock && !use_mbx) | |
237 | use_lockfile = use_fcntl = TRUE; | |
238 | ||
239 | /* Default fcntl() for use with mbx */ | |
240 | ||
241 | if (use_mbx && !use_fcntl && !use_flock) use_fcntl = TRUE; | |
242 | ||
243 | /* Unset unused timeouts */ | |
244 | ||
245 | if (!use_fcntl) lock_fcntl_timeout = 0; | |
246 | if (!use_flock) lock_flock_timeout = 0; | |
247 | ||
248 | /* A file name is required */ | |
249 | ||
250 | if (i >= argc) usage(); | |
251 | ||
252 | filename = argv[i++]; | |
253 | ||
254 | /* Expand file names starting with ~ */ | |
255 | ||
256 | if (*filename == '~') | |
257 | { | |
258 | struct passwd *pw; | |
259 | ||
260 | if (*(++filename) == '/') | |
261 | pw = getpwuid(getuid()); | |
262 | else | |
263 | { | |
264 | char *s = buffer; | |
265 | while (*filename != 0 && *filename != '/') | |
266 | *s++ = *filename++; | |
267 | *s = 0; | |
268 | pw = getpwnam(buffer); | |
269 | } | |
270 | ||
271 | if (pw == NULL) | |
272 | { | |
273 | printf("exim_lock: unable to expand file name %s\n", argv[i-1]); | |
274 | exit(1); | |
275 | } | |
276 | ||
277 | if ((int)strlen(pw->pw_dir) + (int)strlen(filename) + 1 > sizeof(buffer)) | |
278 | { | |
279 | printf("exim_lock: expanded file name %s%s is too long", pw->pw_dir, | |
280 | filename); | |
281 | exit(1); | |
282 | } | |
283 | ||
284 | strcpy(buffer, pw->pw_dir); | |
285 | strcat(buffer, filename); | |
286 | filename = buffer; | |
287 | } | |
288 | ||
289 | /* If using a lock file, prepare by creating the lock file name and | |
290 | the hitching post name. */ | |
291 | ||
292 | if (use_lockfile) | |
293 | { | |
294 | if (uname(&s) < 0) | |
295 | { | |
296 | printf("exim_lock: failed to find host name using uname()\n"); | |
297 | exit(1); | |
298 | } | |
299 | primary_hostname = s.nodename; | |
300 | ||
301 | len = (int)strlen(filename); | |
302 | lockname = malloc(len + 8); | |
303 | sprintf(lockname, "%s.lock", filename); | |
304 | hitchname = malloc(len + 32 + (int)strlen(primary_hostname)); | |
19050083 JH |
305 | |
306 | /* Presumably, this must match appendfile.c */ | |
059ec3d9 | 307 | sprintf(hitchname, "%s.%s.%08x.%08x", lockname, primary_hostname, |
19050083 | 308 | (unsigned int)now, (unsigned int)getpid()); |
059ec3d9 PH |
309 | |
310 | if (verbose) | |
311 | printf("exim_lock: lockname = %s\n hitchname = %s\n", lockname, | |
312 | hitchname); | |
313 | } | |
314 | ||
315 | /* Locking retry loop */ | |
316 | ||
317 | for (j = 0; j < lock_retries; j++) | |
318 | { | |
319 | int sleep_before_retry = TRUE; | |
bf83d8d3 PP |
320 | struct stat statbuf, ostatbuf, lstatbuf, statbuf2; |
321 | int mbx_tmp_oflags; | |
059ec3d9 PH |
322 | |
323 | /* Try to build a lock file if so configured */ | |
324 | ||
325 | if (use_lockfile) | |
326 | { | |
c99b02de | 327 | int rc, rc2; |
059ec3d9 PH |
328 | if (verbose) printf("exim_lock: creating lock file\n"); |
329 | hd = open(hitchname, O_WRONLY | O_CREAT | O_EXCL, 0440); | |
330 | if (hd < 0) | |
331 | { | |
332 | printf("exim_lock: failed to create hitching post %s: %s\n", hitchname, | |
333 | strerror(errno)); | |
334 | exit(1); | |
335 | } | |
336 | ||
337 | /* Apply hitching post algorithm. */ | |
338 | ||
c99b02de JH |
339 | if ((rc = link(hitchname, lockname)) != 0) |
340 | rc2 = fstat(hd, &statbuf); | |
f1e894f3 | 341 | (void)close(hd); |
059ec3d9 PH |
342 | unlink(hitchname); |
343 | ||
c99b02de | 344 | if (rc != 0 && (rc2 != 0 || statbuf.st_nlink != 2)) |
059ec3d9 PH |
345 | { |
346 | printf("exim_lock: failed to link hitching post to lock file\n"); | |
347 | hd = -1; | |
348 | goto RETRY; | |
349 | } | |
350 | ||
351 | if (!quiet) printf("exim_lock: lock file successfully created\n"); | |
352 | } | |
353 | ||
354 | /* We are done if no other locking required. */ | |
355 | ||
356 | if (!use_fcntl && !use_flock && !use_mbx) break; | |
357 | ||
358 | /* Open the file for writing. */ | |
359 | ||
360 | fd = open(filename, O_RDWR + O_APPEND); | |
361 | if (fd < 0) | |
362 | { | |
363 | printf("exim_lock: failed to open %s for writing: %s\n", filename, | |
364 | strerror(errno)); | |
365 | yield = 1; | |
366 | goto CLEAN_UP; | |
367 | } | |
368 | ||
369 | /* If there is a timeout, implying blocked locking, we don't want to | |
370 | sleep before any retries after this. */ | |
371 | ||
372 | if (lock_fcntl_timeout > 0 || lock_flock_timeout > 0) | |
373 | sleep_before_retry = FALSE; | |
374 | ||
375 | /* Lock using fcntl. There are pros and cons to using a blocking call vs | |
376 | a non-blocking call and retries. Exim is non-blocking by default, but setting | |
377 | a timeout changes it to blocking. */ | |
378 | ||
379 | if (!use_mbx && (use_fcntl || use_flock)) | |
380 | { | |
381 | if (apply_lock(fd, F_WRLCK, use_fcntl, lock_fcntl_timeout, use_flock, | |
382 | lock_flock_timeout) >= 0) | |
383 | { | |
384 | if (!quiet) | |
385 | { | |
386 | if (use_fcntl) printf("exim_lock: fcntl() lock successfully applied\n"); | |
387 | if (use_flock) printf("exim_lock: flock() lock successfully applied\n"); | |
388 | } | |
389 | break; | |
390 | } | |
391 | else goto RETRY; /* Message already output */ | |
392 | } | |
393 | ||
394 | /* Lock using MBX rules. This is complicated and is documented with the | |
395 | source of the c-client library that goes with Pine and IMAP. What has to | |
396 | be done to interwork correctly is to take out a shared lock on the mailbox, | |
397 | and an exclusive lock on a /tmp file. */ | |
398 | ||
399 | else | |
400 | { | |
401 | if (apply_lock(fd, F_RDLCK, use_fcntl, lock_fcntl_timeout, use_flock, | |
402 | lock_flock_timeout) >= 0) | |
403 | { | |
404 | if (!quiet) | |
405 | { | |
406 | if (use_fcntl) | |
407 | printf("exim_lock: fcntl() read lock successfully applied\n"); | |
408 | if (use_flock) | |
409 | printf("exim_lock: fcntl() read lock successfully applied\n"); | |
410 | } | |
411 | } | |
412 | else goto RETRY; /* Message already output */ | |
413 | ||
414 | if (fstat(fd, &statbuf) < 0) | |
415 | { | |
416 | printf("exim_lock: fstat() of %s failed: %s\n", filename, | |
417 | strerror(errno)); | |
418 | yield = 1; | |
419 | goto CLEAN_UP; | |
420 | } | |
421 | ||
422 | /* Set up file in /tmp and check its state if already existing. */ | |
423 | ||
424 | sprintf(tempname, "/tmp/.%lx.%lx", (long)statbuf.st_dev, | |
425 | (long)statbuf.st_ino); | |
426 | ||
427 | if (lstat(tempname, &statbuf) >= 0) | |
428 | { | |
429 | if ((statbuf.st_mode & S_IFMT) == S_IFLNK) | |
430 | { | |
431 | printf("exim_lock: symbolic link on lock name %s\n", tempname); | |
432 | yield = 1; | |
433 | goto CLEAN_UP; | |
434 | } | |
435 | if (statbuf.st_nlink > 1) | |
436 | { | |
437 | printf("exim_lock: hard link to lock name %s\n", tempname); | |
438 | yield = 1; | |
439 | goto CLEAN_UP; | |
440 | } | |
441 | } | |
442 | ||
bf83d8d3 PP |
443 | mbx_tmp_oflags = O_RDWR | O_CREAT; |
444 | #ifdef O_NOFOLLOW | |
445 | mbx_tmp_oflags |= O_NOFOLLOW; | |
446 | #endif | |
447 | md = open(tempname, mbx_tmp_oflags, 0600); | |
059ec3d9 PH |
448 | if (md < 0) |
449 | { | |
450 | printf("exim_lock: failed to create mbx lock file %s: %s\n", | |
451 | tempname, strerror(errno)); | |
452 | goto CLEAN_UP; | |
bf83d8d3 PP |
453 | } |
454 | ||
455 | /* security fixes from 2010-05 */ | |
456 | if (lstat(tempname, &lstatbuf) < 0) | |
457 | { | |
458 | printf("exim_lock: failed to lstat(%s) after opening it: %s\n", | |
459 | tempname, strerror(errno)); | |
460 | goto CLEAN_UP; | |
461 | } | |
462 | if (fstat(md, &statbuf2) < 0) | |
463 | { | |
464 | printf("exim_lock: failed to fstat() open fd of \"%s\": %s\n", | |
465 | tempname, strerror(errno)); | |
466 | goto CLEAN_UP; | |
467 | } | |
468 | if ((statbuf2.st_nlink > 1) || | |
469 | (lstatbuf.st_nlink > 1) || | |
470 | (!S_ISREG(lstatbuf.st_mode)) || | |
471 | (lstatbuf.st_dev != statbuf2.st_dev) || | |
472 | (lstatbuf.st_ino != statbuf2.st_ino)) | |
473 | { | |
474 | printf("exim_lock: race condition exploited against us when " | |
475 | "locking \"%s\"\n", tempname); | |
476 | goto CLEAN_UP; | |
059ec3d9 PH |
477 | } |
478 | ||
ff790e47 | 479 | (void)chmod(tempname, 0600); |
059ec3d9 PH |
480 | |
481 | if (apply_lock(md, F_WRLCK, use_fcntl, lock_fcntl_timeout, use_flock, | |
482 | lock_flock_timeout) >= 0) | |
483 | { | |
484 | if (!quiet) | |
485 | { | |
486 | if (use_fcntl) | |
487 | printf("exim_lock: fcntl() lock successfully applied to mbx " | |
488 | "lock file %s\n", tempname); | |
489 | if (use_flock) | |
490 | printf("exim_lock: flock() lock successfully applied to mbx " | |
491 | "lock file %s\n", tempname); | |
492 | } | |
493 | ||
494 | /* This test checks for a race condition */ | |
495 | ||
496 | if (lstat(tempname, &statbuf) != 0 || | |
497 | fstat(md, &ostatbuf) != 0 || | |
498 | statbuf.st_dev != ostatbuf.st_dev || | |
499 | statbuf.st_ino != ostatbuf.st_ino) | |
500 | { | |
501 | if (!quiet) printf("exim_lock: mbx lock file %s changed between " | |
502 | "creation and locking\n", tempname); | |
503 | goto RETRY; | |
504 | } | |
505 | else break; | |
506 | } | |
507 | else goto RETRY; /* Message already output */ | |
508 | } | |
509 | ||
510 | /* Clean up before retrying */ | |
511 | ||
512 | RETRY: | |
513 | ||
514 | if (md >= 0) | |
515 | { | |
516 | if (close(md) < 0) | |
517 | printf("exim_lock: close %s failed: %s\n", tempname, strerror(errno)); | |
518 | else | |
519 | if (!quiet) printf("exim_lock: %s closed\n", tempname); | |
520 | md = -1; | |
521 | } | |
522 | ||
523 | if (fd >= 0) | |
524 | { | |
525 | if (close(fd) < 0) | |
526 | printf("exim_lock: close failed: %s\n", strerror(errno)); | |
527 | else | |
528 | if (!quiet) printf("exim_lock: file closed\n"); | |
529 | fd = -1; | |
530 | } | |
531 | ||
532 | if (hd >= 0) | |
533 | { | |
534 | if (unlink(lockname) < 0) | |
535 | printf("exim_lock: unlink of %s failed: %s\n", lockname, strerror(errno)); | |
536 | else | |
537 | if (!quiet) printf("exim_lock: lock file removed\n"); | |
538 | hd = -1; | |
539 | } | |
540 | ||
541 | /* If a blocking call timed out, break the retry loop if the total time | |
542 | so far is not less than than retries * interval. */ | |
543 | ||
544 | if (sigalrm_seen && | |
545 | (j + 1) * ((lock_fcntl_timeout > lock_flock_timeout)? | |
546 | lock_fcntl_timeout : lock_flock_timeout) >= | |
547 | lock_retries * lock_interval) | |
548 | j = lock_retries; | |
549 | ||
550 | /* Wait a bit before retrying, except when it was a blocked fcntl() that | |
551 | caused the problem. */ | |
552 | ||
553 | if (j < lock_retries && sleep_before_retry) | |
554 | { | |
555 | printf(" ... waiting\n"); | |
556 | sleep(lock_interval); | |
557 | } | |
558 | } | |
559 | ||
560 | if (j >= lock_retries) | |
561 | { | |
562 | printf("exim_lock: locking failed too many times\n"); | |
563 | yield = 1; | |
564 | goto CLEAN_UP; | |
565 | } | |
566 | ||
567 | if (!quiet) printf("exim_lock: locking %s succeeded: ", filename); | |
568 | ||
569 | /* If there are no further arguments, run the user's shell; otherwise | |
570 | the next argument is a command to run. */ | |
571 | ||
572 | if (i >= argc) | |
573 | { | |
574 | command = getenv("SHELL"); | |
575 | if (command == NULL || *command == 0) command = "/bin/sh"; | |
576 | if (!quiet) printf("running %s ...\n", command); | |
577 | } | |
578 | else | |
579 | { | |
580 | command = argv[i]; | |
581 | if (!quiet) printf("running the command ...\n"); | |
582 | } | |
583 | ||
584 | /* Run the command, saving and restoring the times if required. */ | |
585 | ||
586 | if (restore_times) | |
587 | { | |
588 | struct stat strestore; | |
589 | struct utimbuf ut; | |
590 | stat(filename, &strestore); | |
1ac6b2e7 | 591 | i = system(command); |
059ec3d9 PH |
592 | ut.actime = strestore.st_atime; |
593 | ut.modtime = strestore.st_mtime; | |
594 | utime(filename, &ut); | |
595 | } | |
1ac6b2e7 JH |
596 | else i = system(command); |
597 | ||
598 | if(i && !quiet) printf("warning: nonzero status %d\n", i); | |
059ec3d9 PH |
599 | |
600 | /* Remove the locks and exit. Unlink the /tmp file if we can get an exclusive | |
601 | lock on the mailbox. This should be a non-blocking lock call, as there is no | |
602 | point in waiting. */ | |
603 | ||
604 | CLEAN_UP: | |
605 | ||
606 | if (md >= 0) | |
607 | { | |
608 | if (apply_lock(fd, F_WRLCK, use_fcntl, 0, use_flock, 0) >= 0) | |
609 | { | |
610 | if (!quiet) printf("exim_lock: %s unlinked - no sharers\n", tempname); | |
611 | unlink(tempname); | |
612 | } | |
613 | else if (!quiet) | |
614 | printf("exim_lock: %s not unlinked - unable to get exclusive mailbox lock\n", | |
615 | tempname); | |
616 | if (close(md) < 0) | |
617 | printf("exim_lock: close %s failed: %s\n", tempname, strerror(errno)); | |
618 | else | |
619 | if (!quiet) printf("exim_lock: %s closed\n", tempname); | |
620 | } | |
621 | ||
622 | if (fd >= 0) | |
623 | { | |
624 | if (close(fd) < 0) | |
625 | printf("exim_lock: close %s failed: %s\n", filename, strerror(errno)); | |
626 | else | |
627 | if (!quiet) printf("exim_lock: %s closed\n", filename); | |
628 | } | |
629 | ||
630 | if (hd >= 0) | |
631 | { | |
632 | if (unlink(lockname) < 0) | |
633 | printf("exim_lock: unlink %s failed: %s\n", lockname, strerror(errno)); | |
634 | else | |
635 | if (!quiet) printf("exim_lock: lock file removed\n"); | |
636 | } | |
637 | ||
638 | return yield; | |
639 | } | |
640 | ||
641 | /* End */ |