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30a4f2a8 | 1 | /* |
262a0e14 | 2 | * $Id$ |
30a4f2a8 | 3 | * |
b510f3a1 | 4 | * DEBUG: section 06 Disk I/O Routines |
30a4f2a8 | 5 | * AUTHOR: Harvest Derived |
6 | * | |
2b6662ba | 7 | * SQUID Web Proxy Cache http://www.squid-cache.org/ |
e25c139f | 8 | * ---------------------------------------------------------- |
30a4f2a8 | 9 | * |
2b6662ba | 10 | * Squid is the result of efforts by numerous individuals from |
11 | * the Internet community; see the CONTRIBUTORS file for full | |
12 | * details. Many organizations have provided support for Squid's | |
13 | * development; see the SPONSORS file for full details. Squid is | |
14 | * Copyrighted (C) 2001 by the Regents of the University of | |
15 | * California; see the COPYRIGHT file for full details. Squid | |
16 | * incorporates software developed and/or copyrighted by other | |
17 | * sources; see the CREDITS file for full details. | |
30a4f2a8 | 18 | * |
19 | * This program is free software; you can redistribute it and/or modify | |
20 | * it under the terms of the GNU General Public License as published by | |
21 | * the Free Software Foundation; either version 2 of the License, or | |
22 | * (at your option) any later version. | |
26ac0430 | 23 | * |
30a4f2a8 | 24 | * This program is distributed in the hope that it will be useful, |
25 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
26 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
27 | * GNU General Public License for more details. | |
26ac0430 | 28 | * |
30a4f2a8 | 29 | * You should have received a copy of the GNU General Public License |
30 | * along with this program; if not, write to the Free Software | |
cbdec147 | 31 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. |
e25c139f | 32 | * |
30a4f2a8 | 33 | */ |
ed43818f | 34 | |
44a47c6e | 35 | #include "squid.h" |
528b2c61 | 36 | #include "fde.h" |
0eb49b6d | 37 | #include "MemBuf.h" |
090089c4 | 38 | |
95d15928 | 39 | static PF diskHandleRead; |
40 | static PF diskHandleWrite; | |
24382924 | 41 | |
ec4daaa5 | 42 | #if defined(_SQUID_WIN32_) || defined(_SQUID_OS2_) |
1a94f598 | 43 | static int |
44 | diskWriteIsComplete(int fd) | |
45 | { | |
46 | return fd_table[fd].disk.write_q ? 0 : 1; | |
47 | } | |
62e76326 | 48 | |
1a94f598 | 49 | #endif |
50 | ||
04cece06 | 51 | void |
0673c0ba | 52 | disk_init(void) |
090089c4 | 53 | { |
60df005c | 54 | (void) 0; |
090089c4 | 55 | } |
56 | ||
59a09b98 FC |
57 | /* hack needed on SunStudio to avoid linkage convention mismatch */ |
58 | static void cxx_xfree(void *ptr) | |
59 | { | |
f673997d | 60 | xfree(ptr); |
59a09b98 FC |
61 | } |
62 | ||
1a94f598 | 63 | /* |
64 | * opens a disk file specified by 'path'. This function always | |
65 | * blocks! There is no callback. | |
66 | */ | |
684c2720 | 67 | int |
1a94f598 | 68 | file_open(const char *path, int mode) |
090089c4 | 69 | { |
090089c4 | 70 | int fd; |
88bfe092 | 71 | PROF_start(file_open); |
62e76326 | 72 | |
5d1a7121 | 73 | if (FILE_MODE(mode) == O_WRONLY) |
62e76326 | 74 | mode |= O_APPEND; |
75 | ||
b870e0b4 | 76 | errno = 0; |
62e76326 | 77 | |
0a0bf5db | 78 | fd = open(path, mode, 0644); |
62e76326 | 79 | |
83704487 | 80 | statCounter.syscalls.disk.opens++; |
62e76326 | 81 | |
0a0bf5db | 82 | if (fd < 0) { |
bf8fe701 | 83 | debugs(50, 3, "file_open: error opening file " << path << ": " << xstrerror()); |
62e76326 | 84 | fd = DISK_ERROR; |
2391a162 | 85 | } else { |
bf8fe701 | 86 | debugs(6, 5, "file_open: FD " << fd); |
62e76326 | 87 | commSetCloseOnExec(fd); |
88 | fd_open(fd, FD_FILE, path); | |
090089c4 | 89 | } |
62e76326 | 90 | |
88bfe092 | 91 | PROF_stop(file_open); |
2391a162 | 92 | return fd; |
0a0bf5db | 93 | } |
94 | ||
2391a162 | 95 | |
090089c4 | 96 | /* close a disk file. */ |
95d15928 | 97 | void |
b8d8561b | 98 | file_close(int fd) |
090089c4 | 99 | { |
76f87348 | 100 | fde *F = &fd_table[fd]; |
2391a162 | 101 | PF *read_callback; |
88bfe092 | 102 | PROF_start(file_close); |
25354045 | 103 | assert(fd >= 0); |
60c0b5a2 | 104 | assert(F->flags.open); |
62e76326 | 105 | |
2391a162 | 106 | if ((read_callback = F->read_handler)) { |
62e76326 | 107 | F->read_handler = NULL; |
108 | read_callback(-1, F->read_data); | |
65d548bf | 109 | } |
62e76326 | 110 | |
0cd30ba5 | 111 | if (F->flags.write_daemon) { |
ec4daaa5 | 112 | #if defined(_SQUID_WIN32_) || defined(_SQUID_OS2_) |
62e76326 | 113 | /* |
114 | * on some operating systems, you can not delete or rename | |
115 | * open files, so we won't allow delayed close. | |
116 | */ | |
117 | ||
118 | while (!diskWriteIsComplete(fd)) | |
119 | diskHandleWrite(fd, NULL); | |
120 | ||
cd377065 | 121 | #else |
62e76326 | 122 | |
123 | F->flags.close_request = 1; | |
124 | ||
bf8fe701 | 125 | debugs(6, 2, "file_close: FD " << fd << ", delaying close"); |
62e76326 | 126 | |
127 | PROF_stop(file_close); | |
128 | ||
129 | return; | |
130 | ||
cd377065 | 131 | #endif |
62e76326 | 132 | |
fb247d78 | 133 | } |
62e76326 | 134 | |
65d548bf | 135 | /* |
136 | * Assert there is no write callback. Otherwise we might be | |
137 | * leaking write state data by closing the descriptor | |
138 | */ | |
139 | assert(F->write_handler == NULL); | |
62e76326 | 140 | |
42f99d0d | 141 | #if CALL_FSYNC_BEFORE_CLOSE |
62e76326 | 142 | |
42f99d0d | 143 | fsync(fd); |
62e76326 | 144 | |
42f99d0d | 145 | #endif |
62e76326 | 146 | |
95d15928 | 147 | close(fd); |
62e76326 | 148 | |
bf8fe701 | 149 | debugs(6, F->flags.close_request ? 2 : 5, "file_close: FD " << fd << " really closing\n"); |
62e76326 | 150 | |
6cf028ab | 151 | fd_close(fd); |
62e76326 | 152 | |
83704487 | 153 | statCounter.syscalls.disk.closes++; |
62e76326 | 154 | |
88bfe092 | 155 | PROF_stop(file_close); |
090089c4 | 156 | } |
157 | ||
f02b8498 | 158 | /* |
159 | * This function has the purpose of combining multiple writes. This is | |
160 | * to facilitate the ASYNC_IO option since it can only guarantee 1 | |
161 | * write to a file per trip around the comm.c select() loop. That's bad | |
162 | * because more than 1 write can be made to the access.log file per | |
163 | * trip, and so this code is purely designed to help batch multiple | |
164 | * sequential writes to the access.log file. Squid will never issue | |
165 | * multiple writes for any other file type during 1 trip around the | |
166 | * select() loop. --SLF | |
167 | */ | |
582b6456 | 168 | static void |
f02b8498 | 169 | diskCombineWrites(struct _fde_disk *fdd) |
090089c4 | 170 | { |
f02b8498 | 171 | /* |
172 | * We need to combine multiple write requests on an FD's write | |
173 | * queue But only if we don't need to seek() in between them, ugh! | |
174 | * XXX This currently ignores any seeks (file_offset) | |
175 | */ | |
62e76326 | 176 | |
26ac0430 | 177 | if (fdd->write_q != NULL && fdd->write_q->next != NULL) { |
b115733c | 178 | int len = 0; |
62e76326 | 179 | |
b115733c | 180 | for (dwrite_q *q = fdd->write_q; q != NULL; q = q->next) |
62e76326 | 181 | len += q->len - q->buf_offset; |
182 | ||
b115733c | 183 | dwrite_q *wq = (dwrite_q *)memAllocate(MEM_DWRITE_Q); |
62e76326 | 184 | |
185 | wq->buf = (char *)xmalloc(len); | |
186 | ||
187 | wq->len = 0; | |
188 | ||
189 | wq->buf_offset = 0; | |
190 | ||
191 | wq->next = NULL; | |
192 | ||
59a09b98 | 193 | wq->free_func = cxx_xfree; |
62e76326 | 194 | |
b115733c AJ |
195 | while (fdd->write_q != NULL) { |
196 | dwrite_q *q = fdd->write_q; | |
197 | ||
62e76326 | 198 | len = q->len - q->buf_offset; |
41d00cd3 | 199 | memcpy(wq->buf + wq->len, q->buf + q->buf_offset, len); |
62e76326 | 200 | wq->len += len; |
201 | fdd->write_q = q->next; | |
202 | ||
203 | if (q->free_func) | |
204 | (q->free_func) (q->buf); | |
205 | ||
b115733c AJ |
206 | memFree(q, MEM_DWRITE_Q); |
207 | }; | |
62e76326 | 208 | |
209 | fdd->write_q_tail = wq; | |
210 | ||
211 | fdd->write_q = wq; | |
0a0bf5db | 212 | } |
f02b8498 | 213 | } |
214 | ||
215 | /* write handler */ | |
216 | static void | |
217 | diskHandleWrite(int fd, void *notused) | |
218 | { | |
219 | int len = 0; | |
f02b8498 | 220 | fde *F = &fd_table[fd]; |
62e76326 | 221 | |
f02b8498 | 222 | struct _fde_disk *fdd = &F->disk; |
2391a162 | 223 | dwrite_q *q = fdd->write_q; |
224 | int status = DISK_OK; | |
2391a162 | 225 | int do_close; |
62e76326 | 226 | |
2391a162 | 227 | if (NULL == q) |
62e76326 | 228 | return; |
229 | ||
88bfe092 | 230 | PROF_start(diskHandleWrite); |
62e76326 | 231 | |
bf8fe701 | 232 | debugs(6, 3, "diskHandleWrite: FD " << fd); |
62e76326 | 233 | |
2391a162 | 234 | F->flags.write_daemon = 0; |
62e76326 | 235 | |
8350fe9b | 236 | assert(fdd->write_q != NULL); |
62e76326 | 237 | |
d377699f | 238 | assert(fdd->write_q->len > fdd->write_q->buf_offset); |
62e76326 | 239 | |
4a7a3d56 | 240 | debugs(6, 3, "diskHandleWrite: FD " << fd << " writing " << (fdd->write_q->len - fdd->write_q->buf_offset) << " bytes"); |
62e76326 | 241 | |
b870e0b4 | 242 | errno = 0; |
62e76326 | 243 | |
cd748f27 | 244 | if (fdd->write_q->file_offset != -1) |
62e76326 | 245 | lseek(fd, fdd->write_q->file_offset, SEEK_SET); |
246 | ||
1f7c9178 | 247 | len = FD_WRITE_METHOD(fd, |
62e76326 | 248 | fdd->write_q->buf + fdd->write_q->buf_offset, |
249 | fdd->write_q->len - fdd->write_q->buf_offset); | |
250 | ||
bf8fe701 | 251 | debugs(6, 3, "diskHandleWrite: FD " << fd << " len = " << len); |
62e76326 | 252 | |
83704487 | 253 | statCounter.syscalls.disk.writes++; |
62e76326 | 254 | |
6cf028ab | 255 | fd_bytes(fd, len, FD_WRITE); |
62e76326 | 256 | |
0a0bf5db | 257 | if (len < 0) { |
62e76326 | 258 | if (!ignoreErrno(errno)) { |
259 | status = errno == ENOSPC ? DISK_NO_SPACE_LEFT : DISK_ERROR; | |
bf8fe701 | 260 | debugs(50, 1, "diskHandleWrite: FD " << fd << ": disk write error: " << xstrerror()); |
261 | ||
62e76326 | 262 | /* |
263 | * If there is no write callback, then this file is | |
264 | * most likely something important like a log file, or | |
265 | * an interprocess pipe. Its not a swapfile. We feel | |
266 | * that a write failure on a log file is rather important, | |
267 | * and Squid doesn't otherwise deal with this condition. | |
268 | * So to get the administrators attention, we exit with | |
269 | * a fatal message. | |
270 | */ | |
271 | ||
272 | if (fdd->wrt_handle == NULL) | |
273 | fatal("Write failure -- check your disk space and cache.log"); | |
274 | ||
275 | /* | |
276 | * If there is a write failure, then we notify the | |
277 | * upper layer via the callback, at the end of this | |
278 | * function. Meanwhile, flush all pending buffers | |
279 | * here. Let the upper layer decide how to handle the | |
280 | * failure. This will prevent experiencing multiple, | |
281 | * repeated write failures for the same FD because of | |
282 | * the queued data. | |
283 | */ | |
284 | do { | |
285 | fdd->write_q = q->next; | |
286 | ||
287 | if (q->free_func) | |
288 | (q->free_func) (q->buf); | |
289 | ||
290 | if (q) { | |
291 | memFree(q, MEM_DWRITE_Q); | |
292 | q = NULL; | |
293 | } | |
294 | } while ((q = fdd->write_q)); | |
295 | } | |
296 | ||
297 | len = 0; | |
0a0bf5db | 298 | } |
62e76326 | 299 | |
8350fe9b | 300 | if (q != NULL) { |
62e76326 | 301 | /* q might become NULL from write failure above */ |
302 | q->buf_offset += len; | |
303 | ||
304 | if (q->buf_offset > q->len) | |
bf8fe701 | 305 | debugs(50, 1, "diskHandleWriteComplete: q->buf_offset > q->len (" << |
306 | q << "," << (int) q->buf_offset << ", " << q->len << ", " << | |
307 | len << " FD " << fd << ")"); | |
308 | ||
62e76326 | 309 | |
310 | assert(q->buf_offset <= q->len); | |
311 | ||
312 | if (q->buf_offset == q->len) { | |
313 | /* complete write */ | |
314 | fdd->write_q = q->next; | |
315 | ||
316 | if (q->free_func) | |
317 | (q->free_func) (q->buf); | |
318 | ||
319 | if (q) { | |
320 | memFree(q, MEM_DWRITE_Q); | |
321 | q = NULL; | |
322 | } | |
323 | } | |
090089c4 | 324 | } |
62e76326 | 325 | |
de866d20 | 326 | if (fdd->write_q == NULL) { |
62e76326 | 327 | /* no more data */ |
328 | fdd->write_q_tail = NULL; | |
de866d20 | 329 | } else { |
62e76326 | 330 | /* another block is queued */ |
331 | diskCombineWrites(fdd); | |
332 | commSetSelect(fd, COMM_SELECT_WRITE, diskHandleWrite, NULL, 0); | |
333 | F->flags.write_daemon = 1; | |
4a86108c | 334 | } |
62e76326 | 335 | |
0cd30ba5 | 336 | do_close = F->flags.close_request; |
62e76326 | 337 | |
25354045 | 338 | if (fdd->wrt_handle) { |
62e76326 | 339 | DWCB *callback = fdd->wrt_handle; |
340 | void *cbdata; | |
341 | fdd->wrt_handle = NULL; | |
342 | ||
343 | if (cbdataReferenceValidDone(fdd->wrt_handle_data, &cbdata)) { | |
344 | callback(fd, status, len, cbdata); | |
345 | /* | |
346 | * NOTE, this callback can close the FD, so we must | |
347 | * not touch 'F', 'fdd', etc. after this. | |
348 | */ | |
349 | PROF_stop(diskHandleWrite); | |
350 | return; | |
351 | /* XXX But what about close_request??? */ | |
352 | } | |
25354045 | 353 | } |
62e76326 | 354 | |
68c21f71 | 355 | if (do_close) |
62e76326 | 356 | file_close(fd); |
357 | ||
88bfe092 | 358 | PROF_stop(diskHandleWrite); |
090089c4 | 359 | } |
360 | ||
361 | ||
090089c4 | 362 | /* write block to a file */ |
363 | /* write back queue. Only one writer at a time. */ | |
364 | /* call a handle when writing is complete. */ | |
e3ef2b09 | 365 | void |
3ebcfaa1 | 366 | file_write(int fd, |
62e76326 | 367 | off_t file_offset, |
368 | void const *ptr_to_buf, | |
369 | int len, | |
370 | DWCB * handle, | |
371 | void *handle_data, | |
372 | FREE * free_func) | |
090089c4 | 373 | { |
c6ac7aae | 374 | dwrite_q *wq = NULL; |
48cc3fcf | 375 | fde *F = &fd_table[fd]; |
88bfe092 | 376 | PROF_start(file_write); |
48cc3fcf | 377 | assert(fd >= 0); |
60c0b5a2 | 378 | assert(F->flags.open); |
090089c4 | 379 | /* if we got here. Caller is eligible to write. */ |
e6ccf245 | 380 | wq = (dwrite_q *)memAllocate(MEM_DWRITE_Q); |
d377699f | 381 | wq->file_offset = file_offset; |
e6ccf245 | 382 | wq->buf = (char *)ptr_to_buf; |
090089c4 | 383 | wq->len = len; |
d377699f | 384 | wq->buf_offset = 0; |
090089c4 | 385 | wq->next = NULL; |
ed7f0b6a | 386 | wq->free_func = free_func; |
62e76326 | 387 | |
fa80a8ef | 388 | if (!F->disk.wrt_handle_data) { |
62e76326 | 389 | F->disk.wrt_handle = handle; |
390 | F->disk.wrt_handle_data = cbdataReference(handle_data); | |
fa80a8ef | 391 | } else { |
62e76326 | 392 | /* Detect if there is multiple concurrent users of this fd.. we only support one callback */ |
393 | assert(F->disk.wrt_handle_data == handle_data && F->disk.wrt_handle == handle); | |
fa80a8ef | 394 | } |
62e76326 | 395 | |
090089c4 | 396 | /* add to queue */ |
48cc3fcf | 397 | if (F->disk.write_q == NULL) { |
62e76326 | 398 | /* empty queue */ |
399 | F->disk.write_q = F->disk.write_q_tail = wq; | |
090089c4 | 400 | } else { |
62e76326 | 401 | F->disk.write_q_tail->next = wq; |
402 | F->disk.write_q_tail = wq; | |
090089c4 | 403 | } |
62e76326 | 404 | |
0cd30ba5 | 405 | if (!F->flags.write_daemon) { |
62e76326 | 406 | diskHandleWrite(fd, NULL); |
429fdbec | 407 | } |
62e76326 | 408 | |
88bfe092 | 409 | PROF_stop(file_write); |
090089c4 | 410 | } |
411 | ||
23b2b404 | 412 | /* |
413 | * a wrapper around file_write to allow for MemBuf to be file_written | |
414 | * in a snap | |
415 | */ | |
137ee196 | 416 | void |
417 | file_write_mbuf(int fd, off_t off, MemBuf mb, DWCB * handler, void *handler_data) | |
418 | { | |
2fe7eff9 | 419 | file_write(fd, off, mb.buf, mb.size, handler, handler_data, mb.freeFunc()); |
137ee196 | 420 | } |
090089c4 | 421 | |
422 | /* Read from FD */ | |
582b6456 | 423 | static void |
424 | diskHandleRead(int fd, void *data) | |
090089c4 | 425 | { |
e6ccf245 | 426 | dread_ctrl *ctrl_dat = (dread_ctrl *)data; |
edd2eb63 | 427 | fde *F = &fd_table[fd]; |
090089c4 | 428 | int len; |
2391a162 | 429 | int rc = DISK_OK; |
65d548bf | 430 | /* |
431 | * FD < 0 indicates premature close; we just have to free | |
432 | * the state data. | |
433 | */ | |
62e76326 | 434 | |
65d548bf | 435 | if (fd < 0) { |
62e76326 | 436 | memFree(ctrl_dat, MEM_DREAD_CTRL); |
437 | return; | |
65d548bf | 438 | } |
62e76326 | 439 | |
88bfe092 | 440 | PROF_start(diskHandleRead); |
62e76326 | 441 | |
711982d8 | 442 | if (F->disk.offset != ctrl_dat->offset) { |
4a7a3d56 | 443 | debugs(6, 3, "diskHandleRead: FD " << fd << " seeking to offset " << ctrl_dat->offset); |
62e76326 | 444 | lseek(fd, ctrl_dat->offset, SEEK_SET); /* XXX ignore return? */ |
445 | statCounter.syscalls.disk.seeks++; | |
446 | F->disk.offset = ctrl_dat->offset; | |
711982d8 | 447 | } |
62e76326 | 448 | |
b870e0b4 | 449 | errno = 0; |
1f7c9178 | 450 | len = FD_READ_METHOD(fd, ctrl_dat->buf, ctrl_dat->req_len); |
62e76326 | 451 | |
015b507a | 452 | if (len > 0) |
62e76326 | 453 | F->disk.offset += len; |
454 | ||
83704487 | 455 | statCounter.syscalls.disk.reads++; |
62e76326 | 456 | |
4f92c80c | 457 | fd_bytes(fd, len, FD_READ); |
62e76326 | 458 | |
0a0bf5db | 459 | if (len < 0) { |
62e76326 | 460 | if (ignoreErrno(errno)) { |
461 | commSetSelect(fd, COMM_SELECT_READ, diskHandleRead, ctrl_dat, 0); | |
462 | PROF_stop(diskHandleRead); | |
463 | return; | |
464 | } | |
465 | ||
bf8fe701 | 466 | debugs(50, 1, "diskHandleRead: FD " << fd << ": " << xstrerror()); |
62e76326 | 467 | len = 0; |
468 | rc = DISK_ERROR; | |
090089c4 | 469 | } else if (len == 0) { |
62e76326 | 470 | rc = DISK_EOF; |
090089c4 | 471 | } |
62e76326 | 472 | |
fa80a8ef | 473 | if (cbdataReferenceValid(ctrl_dat->client_data)) |
62e76326 | 474 | ctrl_dat->handler(fd, ctrl_dat->buf, len, rc, ctrl_dat->client_data); |
475 | ||
fa80a8ef | 476 | cbdataReferenceDone(ctrl_dat->client_data); |
62e76326 | 477 | |
db1cd23c | 478 | memFree(ctrl_dat, MEM_DREAD_CTRL); |
62e76326 | 479 | |
88bfe092 | 480 | PROF_stop(diskHandleRead); |
090089c4 | 481 | } |
482 | ||
483 | ||
484 | /* start read operation */ | |
62e76326 | 485 | /* buffer must be allocated from the caller. |
26ac0430 | 486 | * It must have at least req_len space in there. |
090089c4 | 487 | * call handler when a reading is complete. */ |
2391a162 | 488 | void |
d377699f | 489 | file_read(int fd, char *buf, int req_len, off_t offset, DRCB * handler, void *client_data) |
090089c4 | 490 | { |
491 | dread_ctrl *ctrl_dat; | |
88bfe092 | 492 | PROF_start(file_read); |
711982d8 | 493 | assert(fd >= 0); |
e6ccf245 | 494 | ctrl_dat = (dread_ctrl *)memAllocate(MEM_DREAD_CTRL); |
090089c4 | 495 | ctrl_dat->fd = fd; |
496 | ctrl_dat->offset = offset; | |
497 | ctrl_dat->req_len = req_len; | |
498 | ctrl_dat->buf = buf; | |
090089c4 | 499 | ctrl_dat->end_of_file = 0; |
500 | ctrl_dat->handler = handler; | |
fa80a8ef | 501 | ctrl_dat->client_data = cbdataReference(client_data); |
0a0bf5db | 502 | diskHandleRead(fd, ctrl_dat); |
88bfe092 | 503 | PROF_stop(file_read); |
090089c4 | 504 | } |
c8f4eac4 | 505 | |
506 | void | |
507 | safeunlink(const char *s, int quiet) | |
508 | { | |
509 | statCounter.syscalls.disk.unlinks++; | |
510 | ||
511 | if (unlink(s) < 0 && !quiet) | |
bf8fe701 | 512 | debugs(50, 1, "safeunlink: Couldn't delete " << s << ": " << xstrerror()); |
c8f4eac4 | 513 | } |
514 | ||
515 | /* | |
516 | * Same as rename(2) but complains if something goes wrong; | |
26ac0430 | 517 | * the caller is responsible for handing and explaining the |
c8f4eac4 | 518 | * consequences of errors. |
519 | */ | |
520 | int | |
521 | xrename(const char *from, const char *to) | |
522 | { | |
bf8fe701 | 523 | debugs(21, 2, "xrename: renaming " << from << " to " << to); |
c8f4eac4 | 524 | #if defined (_SQUID_OS2_) || defined (_SQUID_WIN32_) |
525 | ||
526 | remove | |
26ac0430 | 527 | (to); |
c8f4eac4 | 528 | |
529 | #endif | |
530 | ||
531 | if (0 == rename(from, to)) | |
532 | return 0; | |
533 | ||
bf8fe701 | 534 | debugs(21, errno == ENOENT ? 2 : 1, "xrename: Cannot rename " << from << " to " << to << ": " << xstrerror()); |
c8f4eac4 | 535 | |
536 | return -1; | |
537 | } | |
538 |