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