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Commit | Line | Data |
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30a4f2a8 | 1 | /* |
bbc27441 | 2 | * Copyright (C) 1996-2014 The Squid Software Foundation and contributors |
e25c139f | 3 | * |
bbc27441 AJ |
4 | * Squid software is distributed under GPLv2+ license and includes |
5 | * contributions from numerous individuals and organizations. | |
6 | * Please see the COPYING and CONTRIBUTORS files for details. | |
30a4f2a8 | 7 | */ |
ed43818f | 8 | |
bbc27441 AJ |
9 | /* DEBUG: section 06 Disk I/O Routines */ |
10 | ||
582c2af2 | 11 | #include "squid.h" |
d841c88d | 12 | #include "comm/Loops.h" |
65914896 | 13 | #include "disk.h" |
c4ad1349 | 14 | #include "fd.h" |
528b2c61 | 15 | #include "fde.h" |
67679543 | 16 | #include "globals.h" |
8a89c28f | 17 | #include "Mem.h" |
0eb49b6d | 18 | #include "MemBuf.h" |
582c2af2 | 19 | #include "profiler/Profiler.h" |
e4f1fdae | 20 | #include "StatCounters.h" |
090089c4 | 21 | |
1a30fdf5 | 22 | #include <cerrno> |
21d845b1 | 23 | |
95d15928 | 24 | static PF diskHandleRead; |
25 | static PF diskHandleWrite; | |
24382924 | 26 | |
be266cb2 | 27 | #if _SQUID_WINDOWS_ || _SQUID_OS2_ |
1a94f598 | 28 | static int |
29 | diskWriteIsComplete(int fd) | |
30 | { | |
31 | return fd_table[fd].disk.write_q ? 0 : 1; | |
32 | } | |
62e76326 | 33 | |
1a94f598 | 34 | #endif |
35 | ||
04cece06 | 36 | void |
0673c0ba | 37 | disk_init(void) |
090089c4 | 38 | { |
60df005c | 39 | (void) 0; |
090089c4 | 40 | } |
41 | ||
59a09b98 FC |
42 | /* hack needed on SunStudio to avoid linkage convention mismatch */ |
43 | static void cxx_xfree(void *ptr) | |
44 | { | |
f673997d | 45 | xfree(ptr); |
59a09b98 FC |
46 | } |
47 | ||
1a94f598 | 48 | /* |
49 | * opens a disk file specified by 'path'. This function always | |
50 | * blocks! There is no callback. | |
51 | */ | |
684c2720 | 52 | int |
1a94f598 | 53 | file_open(const char *path, int mode) |
090089c4 | 54 | { |
090089c4 | 55 | int fd; |
88bfe092 | 56 | PROF_start(file_open); |
62e76326 | 57 | |
5d1a7121 | 58 | if (FILE_MODE(mode) == O_WRONLY) |
62e76326 | 59 | mode |= O_APPEND; |
60 | ||
b870e0b4 | 61 | errno = 0; |
62e76326 | 62 | |
0a0bf5db | 63 | fd = open(path, mode, 0644); |
62e76326 | 64 | |
95dc7ff4 | 65 | ++ statCounter.syscalls.disk.opens; |
62e76326 | 66 | |
0a0bf5db | 67 | if (fd < 0) { |
bf8fe701 | 68 | debugs(50, 3, "file_open: error opening file " << path << ": " << xstrerror()); |
62e76326 | 69 | fd = DISK_ERROR; |
2391a162 | 70 | } else { |
bf8fe701 | 71 | debugs(6, 5, "file_open: FD " << fd); |
62e76326 | 72 | commSetCloseOnExec(fd); |
73 | fd_open(fd, FD_FILE, path); | |
090089c4 | 74 | } |
62e76326 | 75 | |
88bfe092 | 76 | PROF_stop(file_open); |
2391a162 | 77 | return fd; |
0a0bf5db | 78 | } |
79 | ||
090089c4 | 80 | /* close a disk file. */ |
95d15928 | 81 | void |
b8d8561b | 82 | file_close(int fd) |
090089c4 | 83 | { |
76f87348 | 84 | fde *F = &fd_table[fd]; |
2391a162 | 85 | PF *read_callback; |
88bfe092 | 86 | PROF_start(file_close); |
25354045 | 87 | assert(fd >= 0); |
60c0b5a2 | 88 | assert(F->flags.open); |
62e76326 | 89 | |
2391a162 | 90 | if ((read_callback = F->read_handler)) { |
62e76326 | 91 | F->read_handler = NULL; |
92 | read_callback(-1, F->read_data); | |
65d548bf | 93 | } |
62e76326 | 94 | |
0cd30ba5 | 95 | if (F->flags.write_daemon) { |
be266cb2 | 96 | #if _SQUID_WINDOWS_ || _SQUID_OS2_ |
62e76326 | 97 | /* |
98 | * on some operating systems, you can not delete or rename | |
99 | * open files, so we won't allow delayed close. | |
100 | */ | |
62e76326 | 101 | while (!diskWriteIsComplete(fd)) |
102 | diskHandleWrite(fd, NULL); | |
cd377065 | 103 | #else |
be4d35dc | 104 | F->flags.close_request = true; |
bf8fe701 | 105 | debugs(6, 2, "file_close: FD " << fd << ", delaying close"); |
62e76326 | 106 | PROF_stop(file_close); |
62e76326 | 107 | return; |
cd377065 | 108 | #endif |
62e76326 | 109 | |
fb247d78 | 110 | } |
62e76326 | 111 | |
65d548bf | 112 | /* |
113 | * Assert there is no write callback. Otherwise we might be | |
114 | * leaking write state data by closing the descriptor | |
115 | */ | |
116 | assert(F->write_handler == NULL); | |
62e76326 | 117 | |
42f99d0d | 118 | #if CALL_FSYNC_BEFORE_CLOSE |
62e76326 | 119 | |
42f99d0d | 120 | fsync(fd); |
62e76326 | 121 | |
42f99d0d | 122 | #endif |
62e76326 | 123 | |
95d15928 | 124 | close(fd); |
62e76326 | 125 | |
bf8fe701 | 126 | debugs(6, F->flags.close_request ? 2 : 5, "file_close: FD " << fd << " really closing\n"); |
62e76326 | 127 | |
6cf028ab | 128 | fd_close(fd); |
62e76326 | 129 | |
95dc7ff4 | 130 | ++ statCounter.syscalls.disk.closes; |
62e76326 | 131 | |
88bfe092 | 132 | PROF_stop(file_close); |
090089c4 | 133 | } |
134 | ||
f02b8498 | 135 | /* |
136 | * This function has the purpose of combining multiple writes. This is | |
137 | * to facilitate the ASYNC_IO option since it can only guarantee 1 | |
138 | * write to a file per trip around the comm.c select() loop. That's bad | |
139 | * because more than 1 write can be made to the access.log file per | |
140 | * trip, and so this code is purely designed to help batch multiple | |
141 | * sequential writes to the access.log file. Squid will never issue | |
142 | * multiple writes for any other file type during 1 trip around the | |
143 | * select() loop. --SLF | |
144 | */ | |
582b6456 | 145 | static void |
5fed1735 | 146 | diskCombineWrites(_fde_disk *fdd) |
090089c4 | 147 | { |
f02b8498 | 148 | /* |
149 | * We need to combine multiple write requests on an FD's write | |
150 | * queue But only if we don't need to seek() in between them, ugh! | |
151 | * XXX This currently ignores any seeks (file_offset) | |
152 | */ | |
62e76326 | 153 | |
26ac0430 | 154 | if (fdd->write_q != NULL && fdd->write_q->next != NULL) { |
b115733c | 155 | int len = 0; |
62e76326 | 156 | |
b115733c | 157 | for (dwrite_q *q = fdd->write_q; q != NULL; q = q->next) |
62e76326 | 158 | len += q->len - q->buf_offset; |
159 | ||
b115733c | 160 | dwrite_q *wq = (dwrite_q *)memAllocate(MEM_DWRITE_Q); |
62e76326 | 161 | |
162 | wq->buf = (char *)xmalloc(len); | |
163 | ||
164 | wq->len = 0; | |
165 | ||
166 | wq->buf_offset = 0; | |
167 | ||
168 | wq->next = NULL; | |
169 | ||
59a09b98 | 170 | wq->free_func = cxx_xfree; |
62e76326 | 171 | |
b115733c AJ |
172 | while (fdd->write_q != NULL) { |
173 | dwrite_q *q = fdd->write_q; | |
174 | ||
62e76326 | 175 | len = q->len - q->buf_offset; |
41d00cd3 | 176 | memcpy(wq->buf + wq->len, q->buf + q->buf_offset, len); |
62e76326 | 177 | wq->len += len; |
178 | fdd->write_q = q->next; | |
179 | ||
180 | if (q->free_func) | |
6ca34f6f | 181 | q->free_func(q->buf); |
62e76326 | 182 | |
b115733c AJ |
183 | memFree(q, MEM_DWRITE_Q); |
184 | }; | |
62e76326 | 185 | |
186 | fdd->write_q_tail = wq; | |
187 | ||
188 | fdd->write_q = wq; | |
0a0bf5db | 189 | } |
f02b8498 | 190 | } |
191 | ||
192 | /* write handler */ | |
193 | static void | |
194 | diskHandleWrite(int fd, void *notused) | |
195 | { | |
196 | int len = 0; | |
f02b8498 | 197 | fde *F = &fd_table[fd]; |
62e76326 | 198 | |
5fed1735 | 199 | _fde_disk *fdd = &F->disk; |
2391a162 | 200 | dwrite_q *q = fdd->write_q; |
201 | int status = DISK_OK; | |
be4d35dc | 202 | bool do_close; |
62e76326 | 203 | |
2391a162 | 204 | if (NULL == q) |
62e76326 | 205 | return; |
206 | ||
88bfe092 | 207 | PROF_start(diskHandleWrite); |
62e76326 | 208 | |
bf8fe701 | 209 | debugs(6, 3, "diskHandleWrite: FD " << fd); |
62e76326 | 210 | |
be4d35dc | 211 | F->flags.write_daemon = false; |
62e76326 | 212 | |
8350fe9b | 213 | assert(fdd->write_q != NULL); |
62e76326 | 214 | |
d377699f | 215 | assert(fdd->write_q->len > fdd->write_q->buf_offset); |
62e76326 | 216 | |
e2851fe7 AR |
217 | debugs(6, 3, "diskHandleWrite: FD " << fd << " writing " << |
218 | (fdd->write_q->len - fdd->write_q->buf_offset) << " bytes at " << | |
219 | fdd->write_q->file_offset); | |
62e76326 | 220 | |
b870e0b4 | 221 | errno = 0; |
62e76326 | 222 | |
cd748f27 | 223 | if (fdd->write_q->file_offset != -1) |
e2851fe7 | 224 | lseek(fd, fdd->write_q->file_offset, SEEK_SET); /* XXX ignore return? */ |
62e76326 | 225 | |
1f7c9178 | 226 | len = FD_WRITE_METHOD(fd, |
62e76326 | 227 | fdd->write_q->buf + fdd->write_q->buf_offset, |
228 | fdd->write_q->len - fdd->write_q->buf_offset); | |
229 | ||
bf8fe701 | 230 | debugs(6, 3, "diskHandleWrite: FD " << fd << " len = " << len); |
62e76326 | 231 | |
95dc7ff4 | 232 | ++ statCounter.syscalls.disk.writes; |
62e76326 | 233 | |
6cf028ab | 234 | fd_bytes(fd, len, FD_WRITE); |
62e76326 | 235 | |
0a0bf5db | 236 | if (len < 0) { |
62e76326 | 237 | if (!ignoreErrno(errno)) { |
238 | status = errno == ENOSPC ? DISK_NO_SPACE_LEFT : DISK_ERROR; | |
e0236918 | 239 | debugs(50, DBG_IMPORTANT, "diskHandleWrite: FD " << fd << ": disk write error: " << xstrerror()); |
bf8fe701 | 240 | |
62e76326 | 241 | /* |
242 | * If there is no write callback, then this file is | |
243 | * most likely something important like a log file, or | |
244 | * an interprocess pipe. Its not a swapfile. We feel | |
245 | * that a write failure on a log file is rather important, | |
246 | * and Squid doesn't otherwise deal with this condition. | |
247 | * So to get the administrators attention, we exit with | |
248 | * a fatal message. | |
249 | */ | |
250 | ||
251 | if (fdd->wrt_handle == NULL) | |
252 | fatal("Write failure -- check your disk space and cache.log"); | |
253 | ||
254 | /* | |
255 | * If there is a write failure, then we notify the | |
256 | * upper layer via the callback, at the end of this | |
257 | * function. Meanwhile, flush all pending buffers | |
258 | * here. Let the upper layer decide how to handle the | |
259 | * failure. This will prevent experiencing multiple, | |
260 | * repeated write failures for the same FD because of | |
261 | * the queued data. | |
262 | */ | |
263 | do { | |
264 | fdd->write_q = q->next; | |
265 | ||
266 | if (q->free_func) | |
6ca34f6f | 267 | q->free_func(q->buf); |
62e76326 | 268 | |
269 | if (q) { | |
270 | memFree(q, MEM_DWRITE_Q); | |
271 | q = NULL; | |
272 | } | |
273 | } while ((q = fdd->write_q)); | |
274 | } | |
275 | ||
276 | len = 0; | |
0a0bf5db | 277 | } |
62e76326 | 278 | |
8350fe9b | 279 | if (q != NULL) { |
62e76326 | 280 | /* q might become NULL from write failure above */ |
281 | q->buf_offset += len; | |
282 | ||
283 | if (q->buf_offset > q->len) | |
e0236918 | 284 | debugs(50, DBG_IMPORTANT, "diskHandleWriteComplete: q->buf_offset > q->len (" << |
bf8fe701 | 285 | q << "," << (int) q->buf_offset << ", " << q->len << ", " << |
286 | len << " FD " << fd << ")"); | |
287 | ||
62e76326 | 288 | assert(q->buf_offset <= q->len); |
289 | ||
290 | if (q->buf_offset == q->len) { | |
291 | /* complete write */ | |
292 | fdd->write_q = q->next; | |
293 | ||
294 | if (q->free_func) | |
6ca34f6f | 295 | q->free_func(q->buf); |
62e76326 | 296 | |
297 | if (q) { | |
298 | memFree(q, MEM_DWRITE_Q); | |
299 | q = NULL; | |
300 | } | |
301 | } | |
090089c4 | 302 | } |
62e76326 | 303 | |
de866d20 | 304 | if (fdd->write_q == NULL) { |
62e76326 | 305 | /* no more data */ |
306 | fdd->write_q_tail = NULL; | |
de866d20 | 307 | } else { |
62e76326 | 308 | /* another block is queued */ |
309 | diskCombineWrites(fdd); | |
d841c88d | 310 | Comm::SetSelect(fd, COMM_SELECT_WRITE, diskHandleWrite, NULL, 0); |
be4d35dc | 311 | F->flags.write_daemon = true; |
4a86108c | 312 | } |
62e76326 | 313 | |
0cd30ba5 | 314 | do_close = F->flags.close_request; |
62e76326 | 315 | |
25354045 | 316 | if (fdd->wrt_handle) { |
62e76326 | 317 | DWCB *callback = fdd->wrt_handle; |
318 | void *cbdata; | |
319 | fdd->wrt_handle = NULL; | |
320 | ||
321 | if (cbdataReferenceValidDone(fdd->wrt_handle_data, &cbdata)) { | |
322 | callback(fd, status, len, cbdata); | |
323 | /* | |
324 | * NOTE, this callback can close the FD, so we must | |
325 | * not touch 'F', 'fdd', etc. after this. | |
326 | */ | |
327 | PROF_stop(diskHandleWrite); | |
328 | return; | |
329 | /* XXX But what about close_request??? */ | |
330 | } | |
25354045 | 331 | } |
62e76326 | 332 | |
68c21f71 | 333 | if (do_close) |
62e76326 | 334 | file_close(fd); |
335 | ||
88bfe092 | 336 | PROF_stop(diskHandleWrite); |
090089c4 | 337 | } |
338 | ||
090089c4 | 339 | /* write block to a file */ |
340 | /* write back queue. Only one writer at a time. */ | |
341 | /* call a handle when writing is complete. */ | |
e3ef2b09 | 342 | void |
3ebcfaa1 | 343 | file_write(int fd, |
62e76326 | 344 | off_t file_offset, |
345 | void const *ptr_to_buf, | |
346 | int len, | |
347 | DWCB * handle, | |
348 | void *handle_data, | |
349 | FREE * free_func) | |
090089c4 | 350 | { |
c6ac7aae | 351 | dwrite_q *wq = NULL; |
48cc3fcf | 352 | fde *F = &fd_table[fd]; |
88bfe092 | 353 | PROF_start(file_write); |
48cc3fcf | 354 | assert(fd >= 0); |
60c0b5a2 | 355 | assert(F->flags.open); |
090089c4 | 356 | /* if we got here. Caller is eligible to write. */ |
e6ccf245 | 357 | wq = (dwrite_q *)memAllocate(MEM_DWRITE_Q); |
d377699f | 358 | wq->file_offset = file_offset; |
e6ccf245 | 359 | wq->buf = (char *)ptr_to_buf; |
090089c4 | 360 | wq->len = len; |
d377699f | 361 | wq->buf_offset = 0; |
090089c4 | 362 | wq->next = NULL; |
ed7f0b6a | 363 | wq->free_func = free_func; |
62e76326 | 364 | |
fa80a8ef | 365 | if (!F->disk.wrt_handle_data) { |
62e76326 | 366 | F->disk.wrt_handle = handle; |
367 | F->disk.wrt_handle_data = cbdataReference(handle_data); | |
fa80a8ef | 368 | } else { |
62e76326 | 369 | /* Detect if there is multiple concurrent users of this fd.. we only support one callback */ |
370 | assert(F->disk.wrt_handle_data == handle_data && F->disk.wrt_handle == handle); | |
fa80a8ef | 371 | } |
62e76326 | 372 | |
090089c4 | 373 | /* add to queue */ |
48cc3fcf | 374 | if (F->disk.write_q == NULL) { |
62e76326 | 375 | /* empty queue */ |
376 | F->disk.write_q = F->disk.write_q_tail = wq; | |
090089c4 | 377 | } else { |
62e76326 | 378 | F->disk.write_q_tail->next = wq; |
379 | F->disk.write_q_tail = wq; | |
090089c4 | 380 | } |
62e76326 | 381 | |
0cd30ba5 | 382 | if (!F->flags.write_daemon) { |
62e76326 | 383 | diskHandleWrite(fd, NULL); |
429fdbec | 384 | } |
62e76326 | 385 | |
88bfe092 | 386 | PROF_stop(file_write); |
090089c4 | 387 | } |
388 | ||
23b2b404 | 389 | /* |
390 | * a wrapper around file_write to allow for MemBuf to be file_written | |
391 | * in a snap | |
392 | */ | |
137ee196 | 393 | void |
394 | file_write_mbuf(int fd, off_t off, MemBuf mb, DWCB * handler, void *handler_data) | |
395 | { | |
2fe7eff9 | 396 | file_write(fd, off, mb.buf, mb.size, handler, handler_data, mb.freeFunc()); |
137ee196 | 397 | } |
090089c4 | 398 | |
399 | /* Read from FD */ | |
582b6456 | 400 | static void |
401 | diskHandleRead(int fd, void *data) | |
090089c4 | 402 | { |
e6ccf245 | 403 | dread_ctrl *ctrl_dat = (dread_ctrl *)data; |
edd2eb63 | 404 | fde *F = &fd_table[fd]; |
090089c4 | 405 | int len; |
2391a162 | 406 | int rc = DISK_OK; |
65d548bf | 407 | /* |
408 | * FD < 0 indicates premature close; we just have to free | |
409 | * the state data. | |
410 | */ | |
62e76326 | 411 | |
65d548bf | 412 | if (fd < 0) { |
62e76326 | 413 | memFree(ctrl_dat, MEM_DREAD_CTRL); |
414 | return; | |
65d548bf | 415 | } |
62e76326 | 416 | |
88bfe092 | 417 | PROF_start(diskHandleRead); |
62e76326 | 418 | |
034b5ea4 | 419 | #if WRITES_MAINTAIN_DISK_OFFSET |
711982d8 | 420 | if (F->disk.offset != ctrl_dat->offset) { |
034b5ea4 AR |
421 | #else |
422 | { | |
423 | #endif | |
4a7a3d56 | 424 | debugs(6, 3, "diskHandleRead: FD " << fd << " seeking to offset " << ctrl_dat->offset); |
62e76326 | 425 | lseek(fd, ctrl_dat->offset, SEEK_SET); /* XXX ignore return? */ |
95dc7ff4 | 426 | ++ statCounter.syscalls.disk.seeks; |
62e76326 | 427 | F->disk.offset = ctrl_dat->offset; |
711982d8 | 428 | } |
62e76326 | 429 | |
b870e0b4 | 430 | errno = 0; |
1f7c9178 | 431 | len = FD_READ_METHOD(fd, ctrl_dat->buf, ctrl_dat->req_len); |
62e76326 | 432 | |
015b507a | 433 | if (len > 0) |
62e76326 | 434 | F->disk.offset += len; |
435 | ||
95dc7ff4 | 436 | ++ statCounter.syscalls.disk.reads; |
62e76326 | 437 | |
4f92c80c | 438 | fd_bytes(fd, len, FD_READ); |
62e76326 | 439 | |
0a0bf5db | 440 | if (len < 0) { |
62e76326 | 441 | if (ignoreErrno(errno)) { |
d841c88d | 442 | Comm::SetSelect(fd, COMM_SELECT_READ, diskHandleRead, ctrl_dat, 0); |
62e76326 | 443 | PROF_stop(diskHandleRead); |
444 | return; | |
445 | } | |
446 | ||
e0236918 | 447 | debugs(50, DBG_IMPORTANT, "diskHandleRead: FD " << fd << ": " << xstrerror()); |
62e76326 | 448 | len = 0; |
449 | rc = DISK_ERROR; | |
090089c4 | 450 | } else if (len == 0) { |
62e76326 | 451 | rc = DISK_EOF; |
090089c4 | 452 | } |
62e76326 | 453 | |
fa80a8ef | 454 | if (cbdataReferenceValid(ctrl_dat->client_data)) |
62e76326 | 455 | ctrl_dat->handler(fd, ctrl_dat->buf, len, rc, ctrl_dat->client_data); |
456 | ||
fa80a8ef | 457 | cbdataReferenceDone(ctrl_dat->client_data); |
62e76326 | 458 | |
db1cd23c | 459 | memFree(ctrl_dat, MEM_DREAD_CTRL); |
62e76326 | 460 | |
88bfe092 | 461 | PROF_stop(diskHandleRead); |
090089c4 | 462 | } |
463 | ||
090089c4 | 464 | /* start read operation */ |
62e76326 | 465 | /* buffer must be allocated from the caller. |
26ac0430 | 466 | * It must have at least req_len space in there. |
090089c4 | 467 | * call handler when a reading is complete. */ |
2391a162 | 468 | void |
d377699f | 469 | file_read(int fd, char *buf, int req_len, off_t offset, DRCB * handler, void *client_data) |
090089c4 | 470 | { |
471 | dread_ctrl *ctrl_dat; | |
88bfe092 | 472 | PROF_start(file_read); |
711982d8 | 473 | assert(fd >= 0); |
e6ccf245 | 474 | ctrl_dat = (dread_ctrl *)memAllocate(MEM_DREAD_CTRL); |
090089c4 | 475 | ctrl_dat->fd = fd; |
476 | ctrl_dat->offset = offset; | |
477 | ctrl_dat->req_len = req_len; | |
478 | ctrl_dat->buf = buf; | |
090089c4 | 479 | ctrl_dat->end_of_file = 0; |
480 | ctrl_dat->handler = handler; | |
fa80a8ef | 481 | ctrl_dat->client_data = cbdataReference(client_data); |
0a0bf5db | 482 | diskHandleRead(fd, ctrl_dat); |
88bfe092 | 483 | PROF_stop(file_read); |
090089c4 | 484 | } |
c8f4eac4 | 485 | |
486 | void | |
487 | safeunlink(const char *s, int quiet) | |
488 | { | |
95dc7ff4 | 489 | ++ statCounter.syscalls.disk.unlinks; |
c8f4eac4 | 490 | |
491 | if (unlink(s) < 0 && !quiet) | |
e0236918 | 492 | debugs(50, DBG_IMPORTANT, "safeunlink: Couldn't delete " << s << ": " << xstrerror()); |
c8f4eac4 | 493 | } |
494 | ||
495 | /* | |
496 | * Same as rename(2) but complains if something goes wrong; | |
26ac0430 | 497 | * the caller is responsible for handing and explaining the |
c8f4eac4 | 498 | * consequences of errors. |
499 | */ | |
500 | int | |
501 | xrename(const char *from, const char *to) | |
502 | { | |
bf8fe701 | 503 | debugs(21, 2, "xrename: renaming " << from << " to " << to); |
be266cb2 | 504 | #if _SQUID_OS2_ || _SQUID_WINDOWS_ |
6ca34f6f | 505 | remove(to); |
c8f4eac4 | 506 | #endif |
507 | ||
508 | if (0 == rename(from, to)) | |
509 | return 0; | |
510 | ||
bf8fe701 | 511 | debugs(21, errno == ENOENT ? 2 : 1, "xrename: Cannot rename " << from << " to " << to << ": " << xstrerror()); |
c8f4eac4 | 512 | |
513 | return -1; | |
514 | } | |
515 |