1 /*
2 * win32_replacements.c - Replacements for various functions not available on
3 * Windows, such as fsync().
4 */
5
6 /*
7 * Copyright (C) 2013-2016 Eric Biggers
8 *
9 * This file is free software; you can redistribute it and/or modify it under
10 * the terms of the GNU Lesser General Public License as published by the Free
11 * Software Foundation; either version 3 of the License, or (at your option) any
12 * later version.
13 *
14 * This file is distributed in the hope that it will be useful, but WITHOUT
15 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
16 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
17 * details.
18 *
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this file; if not, see http://www.gnu.org/licenses/.
21 */
22
23 #ifdef __WIN32__
24
25 #ifdef HAVE_CONFIG_H
26 # include "config.h"
27 #endif
28
29 #include <errno.h>
30 #include <pthread.h>
31 #include <io.h> /* for _get_osfhandle() */
32 #include <fcntl.h>
33
34 #include "wimlib/win32_common.h"
35
36 #include "wimlib/assert.h"
37 #include "wimlib/glob.h"
38 #include "wimlib/error.h"
39 #include "wimlib/timestamp.h"
40 #include "wimlib/util.h"
41
42 static int
win32_error_to_errno(DWORD err_code)43 win32_error_to_errno(DWORD err_code)
44 {
45 /* This mapping is that used in Cygwin.
46 * Some of these choices are arbitrary. */
47 switch (err_code) {
48 case ERROR_ACCESS_DENIED:
49 return EACCES;
50 case ERROR_ACTIVE_CONNECTIONS:
51 return EAGAIN;
52 case ERROR_ALREADY_EXISTS:
53 return EEXIST;
54 case ERROR_BAD_DEVICE:
55 return ENODEV;
56 case ERROR_BAD_EXE_FORMAT:
57 return ENOEXEC;
58 case ERROR_BAD_NETPATH:
59 return ENOENT;
60 case ERROR_BAD_NET_NAME:
61 return ENOENT;
62 case ERROR_BAD_NET_RESP:
63 return ENOSYS;
64 case ERROR_BAD_PATHNAME:
65 return ENOENT;
66 case ERROR_BAD_PIPE:
67 return EINVAL;
68 case ERROR_BAD_UNIT:
69 return ENODEV;
70 case ERROR_BAD_USERNAME:
71 return EINVAL;
72 case ERROR_BEGINNING_OF_MEDIA:
73 return EIO;
74 case ERROR_BROKEN_PIPE:
75 return EPIPE;
76 case ERROR_BUSY:
77 return EBUSY;
78 case ERROR_BUS_RESET:
79 return EIO;
80 case ERROR_CALL_NOT_IMPLEMENTED:
81 return ENOSYS;
82 case ERROR_CANNOT_MAKE:
83 return EPERM;
84 case ERROR_CHILD_NOT_COMPLETE:
85 return EBUSY;
86 case ERROR_COMMITMENT_LIMIT:
87 return EAGAIN;
88 case ERROR_CRC:
89 return EIO;
90 case ERROR_DEVICE_DOOR_OPEN:
91 return EIO;
92 case ERROR_DEVICE_IN_USE:
93 return EAGAIN;
94 case ERROR_DEVICE_REQUIRES_CLEANING:
95 return EIO;
96 case ERROR_DIRECTORY:
97 return ENOTDIR;
98 case ERROR_DIR_NOT_EMPTY:
99 return ENOTEMPTY;
100 case ERROR_DISK_CORRUPT:
101 return EIO;
102 case ERROR_DISK_FULL:
103 return ENOSPC;
104 #ifdef ENOTUNIQ
105 case ERROR_DUP_NAME:
106 return ENOTUNIQ;
107 #endif
108 case ERROR_EAS_DIDNT_FIT:
109 return ENOSPC;
110 #ifdef ENOTSUP
111 case ERROR_EAS_NOT_SUPPORTED:
112 return ENOTSUP;
113 #endif
114 case ERROR_EA_LIST_INCONSISTENT:
115 return EINVAL;
116 case ERROR_EA_TABLE_FULL:
117 return ENOSPC;
118 case ERROR_END_OF_MEDIA:
119 return ENOSPC;
120 case ERROR_EOM_OVERFLOW:
121 return EIO;
122 case ERROR_EXE_MACHINE_TYPE_MISMATCH:
123 return ENOEXEC;
124 case ERROR_EXE_MARKED_INVALID:
125 return ENOEXEC;
126 case ERROR_FILEMARK_DETECTED:
127 return EIO;
128 case ERROR_FILENAME_EXCED_RANGE:
129 return ENAMETOOLONG;
130 case ERROR_FILE_CORRUPT:
131 return EEXIST;
132 case ERROR_FILE_EXISTS:
133 return EEXIST;
134 case ERROR_FILE_INVALID:
135 return ENXIO;
136 case ERROR_FILE_NOT_FOUND:
137 return ENOENT;
138 case ERROR_HANDLE_DISK_FULL:
139 return ENOSPC;
140 #ifdef ENODATA
141 case ERROR_HANDLE_EOF:
142 return ENODATA;
143 #endif
144 case ERROR_INVALID_ADDRESS:
145 return EINVAL;
146 case ERROR_INVALID_AT_INTERRUPT_TIME:
147 return EINTR;
148 case ERROR_INVALID_BLOCK_LENGTH:
149 return EIO;
150 case ERROR_INVALID_DATA:
151 return EINVAL;
152 case ERROR_INVALID_DRIVE:
153 return ENODEV;
154 case ERROR_INVALID_EA_NAME:
155 return EINVAL;
156 case ERROR_INVALID_EXE_SIGNATURE:
157 return ENOEXEC;
158 #ifdef EBADRQC
159 case ERROR_INVALID_FUNCTION:
160 return EBADRQC;
161 #endif
162 case ERROR_INVALID_HANDLE:
163 return EBADF;
164 case ERROR_INVALID_NAME:
165 return ENOENT;
166 case ERROR_INVALID_PARAMETER:
167 return EINVAL;
168 case ERROR_INVALID_SIGNAL_NUMBER:
169 return EINVAL;
170 case ERROR_IOPL_NOT_ENABLED:
171 return ENOEXEC;
172 case ERROR_IO_DEVICE:
173 return EIO;
174 case ERROR_IO_INCOMPLETE:
175 return EAGAIN;
176 case ERROR_IO_PENDING:
177 return EAGAIN;
178 case ERROR_LOCK_VIOLATION:
179 return EBUSY;
180 case ERROR_MAX_THRDS_REACHED:
181 return EAGAIN;
182 case ERROR_META_EXPANSION_TOO_LONG:
183 return EINVAL;
184 case ERROR_MOD_NOT_FOUND:
185 return ENOENT;
186 #ifdef EMSGSIZE
187 case ERROR_MORE_DATA:
188 return EMSGSIZE;
189 #endif
190 case ERROR_NEGATIVE_SEEK:
191 return EINVAL;
192 case ERROR_NETNAME_DELETED:
193 return ENOENT;
194 case ERROR_NOACCESS:
195 return EFAULT;
196 case ERROR_NONE_MAPPED:
197 return EINVAL;
198 case ERROR_NONPAGED_SYSTEM_RESOURCES:
199 return EAGAIN;
200 #ifdef ENOLINK
201 case ERROR_NOT_CONNECTED:
202 return ENOLINK;
203 #endif
204 case ERROR_NOT_ENOUGH_MEMORY:
205 return ENOMEM;
206 case ERROR_NOT_OWNER:
207 return EPERM;
208 #ifdef ENOMEDIUM
209 case ERROR_NOT_READY:
210 return ENOMEDIUM;
211 #endif
212 case ERROR_NOT_SAME_DEVICE:
213 return EXDEV;
214 case ERROR_NOT_SUPPORTED:
215 return ENOSYS;
216 case ERROR_NO_DATA:
217 return EPIPE;
218 case ERROR_NO_DATA_DETECTED:
219 return EIO;
220 #ifdef ENOMEDIUM
221 case ERROR_NO_MEDIA_IN_DRIVE:
222 return ENOMEDIUM;
223 #endif
224 #ifdef ENMFILE
225 case ERROR_NO_MORE_FILES:
226 return ENMFILE;
227 #endif
228 #ifdef ENMFILE
229 case ERROR_NO_MORE_ITEMS:
230 return ENMFILE;
231 #endif
232 case ERROR_NO_MORE_SEARCH_HANDLES:
233 return ENFILE;
234 case ERROR_NO_PROC_SLOTS:
235 return EAGAIN;
236 case ERROR_NO_SIGNAL_SENT:
237 return EIO;
238 case ERROR_NO_SYSTEM_RESOURCES:
239 return EFBIG;
240 case ERROR_NO_TOKEN:
241 return EINVAL;
242 case ERROR_OPEN_FAILED:
243 return EIO;
244 case ERROR_OPEN_FILES:
245 return EAGAIN;
246 case ERROR_OUTOFMEMORY:
247 return ENOMEM;
248 case ERROR_PAGED_SYSTEM_RESOURCES:
249 return EAGAIN;
250 case ERROR_PAGEFILE_QUOTA:
251 return EAGAIN;
252 case ERROR_PATH_NOT_FOUND:
253 return ENOENT;
254 case ERROR_PIPE_BUSY:
255 return EBUSY;
256 case ERROR_PIPE_CONNECTED:
257 return EBUSY;
258 #ifdef ECOMM
259 case ERROR_PIPE_LISTENING:
260 return ECOMM;
261 case ERROR_PIPE_NOT_CONNECTED:
262 return ECOMM;
263 #endif
264 case ERROR_POSSIBLE_DEADLOCK:
265 return EDEADLOCK;
266 case ERROR_PRIVILEGE_NOT_HELD:
267 return EPERM;
268 case ERROR_PROCESS_ABORTED:
269 return EFAULT;
270 case ERROR_PROC_NOT_FOUND:
271 return ESRCH;
272 #ifdef ENONET
273 case ERROR_REM_NOT_LIST:
274 return ENONET;
275 #endif
276 case ERROR_SECTOR_NOT_FOUND:
277 return EINVAL;
278 case ERROR_SEEK:
279 return EINVAL;
280 case ERROR_SETMARK_DETECTED:
281 return EIO;
282 case ERROR_SHARING_BUFFER_EXCEEDED:
283 return ENOLCK;
284 case ERROR_SHARING_VIOLATION:
285 return EBUSY;
286 case ERROR_SIGNAL_PENDING:
287 return EBUSY;
288 case ERROR_SIGNAL_REFUSED:
289 return EIO;
290 #ifdef ELIBBAD
291 case ERROR_SXS_CANT_GEN_ACTCTX:
292 return ELIBBAD;
293 #endif
294 case ERROR_THREAD_1_INACTIVE:
295 return EINVAL;
296 case ERROR_TOO_MANY_LINKS:
297 return EMLINK;
298 case ERROR_TOO_MANY_OPEN_FILES:
299 return EMFILE;
300 case ERROR_WAIT_NO_CHILDREN:
301 return ECHILD;
302 case ERROR_WORKING_SET_QUOTA:
303 return EAGAIN;
304 case ERROR_WRITE_PROTECT:
305 return EROFS;
306 default:
307 return -1;
308 }
309 }
310
311 static void
set_errno_from_win32_error(DWORD err)312 set_errno_from_win32_error(DWORD err)
313 {
314 errno = win32_error_to_errno(err);
315 }
316
317 static void
set_errno_from_GetLastError(void)318 set_errno_from_GetLastError(void)
319 {
320 set_errno_from_win32_error(GetLastError());
321 }
322
323 /* Replacement for POSIX fsync() */
324 int
fsync(int fd)325 fsync(int fd)
326 {
327 HANDLE h;
328
329 h = (HANDLE)_get_osfhandle(fd);
330 if (h == INVALID_HANDLE_VALUE)
331 goto err;
332 if (!FlushFileBuffers(h))
333 goto err_set_errno;
334 return 0;
335 err_set_errno:
336 set_errno_from_GetLastError();
337 err:
338 return -1;
339 }
340
341 /* Use the Win32 API to get the number of processors. */
342 unsigned
get_available_cpus(void)343 get_available_cpus(void)
344 {
345 SYSTEM_INFO sysinfo;
346 GetSystemInfo(&sysinfo);
347 return sysinfo.dwNumberOfProcessors;
348 }
349
350 /* Use the Win32 API to get the amount of available memory. */
351 u64
get_available_memory(void)352 get_available_memory(void)
353 {
354 MEMORYSTATUSEX status = {
355 .dwLength = sizeof(status),
356 };
357 GlobalMemoryStatusEx(&status);
358 return (u64)min(status.ullTotalPhys, status.ullTotalVirtual) * 85 / 100;
359 }
360
361 /* Replacement for POSIX-2008 realpath(). Warning: partial functionality only
362 * (resolved_path must be NULL). Also I highly doubt that GetFullPathName
363 * really does the right thing under all circumstances. */
364 wchar_t *
realpath(const wchar_t * path,wchar_t * resolved_path)365 realpath(const wchar_t *path, wchar_t *resolved_path)
366 {
367 DWORD ret;
368 DWORD err;
369 wimlib_assert(resolved_path == NULL);
370
371 ret = GetFullPathNameW(path, 0, NULL, NULL);
372 if (!ret) {
373 err = GetLastError();
374 goto fail_win32;
375 }
376
377 resolved_path = MALLOC(ret * sizeof(wchar_t));
378 if (!resolved_path)
379 goto out;
380 ret = GetFullPathNameW(path, ret, resolved_path, NULL);
381 if (!ret) {
382 err = GetLastError();
383 FREE(resolved_path);
384 resolved_path = NULL;
385 goto fail_win32;
386 }
387 goto out;
388 fail_win32:
389 set_errno_from_win32_error(err);
390 out:
391 return resolved_path;
392 }
393
394 /* A quick hack to get reasonable rename() semantics on Windows, in particular
395 * deleting the destination file instead of failing with ERROR_FILE_EXISTS and
396 * working around any processes that may have the destination file open.
397 *
398 * Note: This is intended to be called when overwriting a regular file with an
399 * updated copy and is *not* a fully POSIX compliant rename(). For that you may
400 * wish to take a look at Cygwin's implementation, but be prepared...
401 *
402 * Return 0 on success, -1 on regular error, or 1 if the destination file was
403 * deleted but the source could not be renamed and therefore should not be
404 * deleted.
405 */
406 int
win32_rename_replacement(const wchar_t * srcpath,const wchar_t * dstpath)407 win32_rename_replacement(const wchar_t *srcpath, const wchar_t *dstpath)
408 {
409 wchar_t *tmpname;
410
411 /* Normally, MoveFileExW() with the MOVEFILE_REPLACE_EXISTING flag does
412 * what we want. */
413
414 if (MoveFileExW(srcpath, dstpath, MOVEFILE_REPLACE_EXISTING))
415 return 0;
416
417 /* MoveFileExW() failed. One way this can happen is if any process has
418 * the destination file open, in which case ERROR_ACCESS_DENIED is
419 * produced. This can commonly happen if there is a backup or antivirus
420 * program monitoring or scanning the files. This behavior is very
421 * different from the behavior of POSIX rename(), which simply unlinks
422 * the destination file and allows other processes to keep it open! */
423
424 if (GetLastError() != ERROR_ACCESS_DENIED)
425 goto err_set_errno;
426
427 /* We can work around the above-mentioned problem by renaming the
428 * destination file to yet another temporary file, then "deleting" it,
429 * which on Windows will in fact not actually delete it immediately but
430 * rather mark it for deletion when the last handle to it is closed. */
431 {
432 static const wchar_t orig_suffix[5] = L".orig";
433 const size_t num_rand_chars = 9;
434 wchar_t *p;
435
436 size_t dstlen = wcslen(dstpath);
437
438 tmpname = alloca(sizeof(wchar_t) *
439 (dstlen + ARRAY_LEN(orig_suffix) + num_rand_chars + 1));
440 p = tmpname;
441 p = wmempcpy(p, dstpath, dstlen);
442 p = wmempcpy(p, orig_suffix, ARRAY_LEN(orig_suffix));
443 get_random_alnum_chars(p, num_rand_chars);
444 p += num_rand_chars;
445 *p = L'\0';
446 }
447
448 if (!MoveFile(dstpath, tmpname))
449 goto err_set_errno;
450
451 if (!DeleteFile(tmpname)) {
452 set_errno_from_GetLastError();
453 WARNING_WITH_ERRNO("Failed to delete original file "
454 "(moved to \"%ls\")", tmpname);
455 }
456
457 if (!MoveFile(srcpath, dstpath)) {
458 set_errno_from_GetLastError();
459 WARNING_WITH_ERRNO("Atomic semantics not respected in "
460 "failed rename() (new file is at \"%ls\")",
461 srcpath);
462 return 1;
463 }
464
465 return 0;
466
467 err_set_errno:
468 set_errno_from_GetLastError();
469 return -1;
470 }
471
472 /* This really could be replaced with _wcserror_s, but this doesn't seem to
473 * actually be available in MSVCRT.DLL on Windows XP (perhaps it's statically
474 * linked in by Visual Studio...?). */
475 int
win32_strerror_r_replacement(int errnum,wchar_t * buf,size_t buflen)476 win32_strerror_r_replacement(int errnum, wchar_t *buf, size_t buflen)
477 {
478 static pthread_mutex_t strerror_lock = PTHREAD_MUTEX_INITIALIZER;
479
480 pthread_mutex_lock(&strerror_lock);
481 mbstowcs(buf, strerror(errnum), buflen);
482 buf[buflen - 1] = '\0';
483 pthread_mutex_unlock(&strerror_lock);
484 return 0;
485 }
486
487 #define MAX_IO_AMOUNT 1048576
488
489 static int
do_pread_or_pwrite(int fd,void * buf,size_t count,off_t offset,bool is_pwrite)490 do_pread_or_pwrite(int fd, void *buf, size_t count, off_t offset,
491 bool is_pwrite)
492 {
493 HANDLE h;
494 LARGE_INTEGER orig_offset;
495 DWORD result = 0xFFFFFFFF;
496 LARGE_INTEGER relative_offset;
497 OVERLAPPED overlapped;
498 BOOL bret;
499 DWORD err = 0;
500
501 h = (HANDLE)_get_osfhandle(fd);
502 if (h == INVALID_HANDLE_VALUE)
503 goto error;
504
505 if (GetFileType(h) == FILE_TYPE_PIPE) {
506 errno = ESPIPE;
507 goto error;
508 }
509
510 /* Get original position */
511 relative_offset.QuadPart = 0;
512 if (!SetFilePointerEx(h, relative_offset, &orig_offset, FILE_CURRENT)) {
513 err = GetLastError();
514 win32_error(err, L"Failed to get original file position");
515 goto error;
516 }
517
518 memset(&overlapped, 0, sizeof(overlapped));
519 overlapped.Offset = offset;
520 overlapped.OffsetHigh = offset >> 32;
521
522 /* Do the read or write at the specified offset */
523 count = min(count, MAX_IO_AMOUNT);
524 SetLastError(0);
525 if (is_pwrite)
526 bret = WriteFile(h, buf, count, &result, &overlapped);
527 else
528 bret = ReadFile(h, buf, count, &result, &overlapped);
529 if (!bret) {
530 err = GetLastError();
531 win32_error(err, L"Failed to %s %zu bytes at offset %"PRIu64,
532 (is_pwrite ? "write" : "read"), count, offset);
533 goto error;
534 }
535
536 wimlib_assert(result <= count);
537
538 /* Restore the original position */
539 if (!SetFilePointerEx(h, orig_offset, NULL, FILE_BEGIN)) {
540 err = GetLastError();
541 win32_error(err, L"Failed to restore file position to %"PRIu64,
542 offset);
543 goto error;
544 }
545
546 return result;
547
548 error:
549 if (err)
550 set_errno_from_win32_error(err);
551 return -1;
552 }
553
554 /* Dumb Windows implementation of pread(). It temporarily changes the file
555 * offset, so it is not safe to use with readers/writers on the same file
556 * descriptor. */
557 ssize_t
win32_pread(int fd,void * buf,size_t count,off_t offset)558 win32_pread(int fd, void *buf, size_t count, off_t offset)
559 {
560 return do_pread_or_pwrite(fd, buf, count, offset, false);
561 }
562
563 /* Dumb Windows implementation of pwrite(). It temporarily changes the file
564 * offset, so it is not safe to use with readers/writers on the same file
565 * descriptor. */
566 ssize_t
win32_pwrite(int fd,const void * buf,size_t count,off_t offset)567 win32_pwrite(int fd, const void *buf, size_t count, off_t offset)
568 {
569 return do_pread_or_pwrite(fd, (void*)buf, count, offset, true);
570 }
571
572 /* Replacement for read() which doesn't hide the Win32 error code */
573 ssize_t
win32_read(int fd,void * buf,size_t count)574 win32_read(int fd, void *buf, size_t count)
575 {
576 HANDLE h = (HANDLE)_get_osfhandle(fd);
577 DWORD result = 0xFFFFFFFF;
578
579 if (h == INVALID_HANDLE_VALUE)
580 return -1;
581
582 count = min(count, MAX_IO_AMOUNT);
583 SetLastError(0);
584 if (!ReadFile(h, buf, count, &result, NULL)) {
585 DWORD err = GetLastError();
586 win32_error(err,
587 L"Error reading %zu bytes from fd %d", count, fd);
588 set_errno_from_win32_error(err);
589 return -1;
590 }
591
592 wimlib_assert(result <= count);
593 return result;
594 }
595
596 /* Replacement for write() which doesn't hide the Win32 error code */
597 ssize_t
win32_write(int fd,const void * buf,size_t count)598 win32_write(int fd, const void *buf, size_t count)
599 {
600 HANDLE h = (HANDLE)_get_osfhandle(fd);
601 DWORD result = 0xFFFFFFFF;
602
603 if (h == INVALID_HANDLE_VALUE)
604 return -1;
605
606 count = min(count, MAX_IO_AMOUNT);
607 SetLastError(0);
608 if (!WriteFile(h, buf, count, &result, NULL)) {
609 DWORD err = GetLastError();
610 win32_error(err,
611 L"Error writing %zu bytes to fd %d", count, fd);
612 set_errno_from_win32_error(err);
613 return -1;
614 }
615
616 wimlib_assert(result <= count);
617 return result;
618 }
619
620 /* Replacement for glob() in Windows native builds that operates on wide
621 * characters. */
622 int
win32_wglob(const wchar_t * pattern,int flags,int (* errfunc)(const wchar_t * epath,int eerrno),glob_t * pglob)623 win32_wglob(const wchar_t *pattern, int flags,
624 int (*errfunc)(const wchar_t *epath, int eerrno),
625 glob_t *pglob)
626 {
627 WIN32_FIND_DATAW dat;
628 DWORD err;
629 HANDLE hFind;
630 int ret;
631 size_t nspaces;
632 int errno_save;
633
634 const wchar_t *backslash, *end_slash;
635 size_t prefix_len;
636
637 backslash = wcsrchr(pattern, L'\\');
638 end_slash = wcsrchr(pattern, L'/');
639
640 if (backslash > end_slash)
641 end_slash = backslash;
642
643 if (end_slash)
644 prefix_len = end_slash - pattern + 1;
645 else
646 prefix_len = 0;
647
648 /* This function does not support all functionality of the POSIX glob(),
649 * so make sure the parameters are consistent with supported
650 * functionality. */
651 wimlib_assert(errfunc == NULL);
652 wimlib_assert((flags & GLOB_ERR) == GLOB_ERR);
653 wimlib_assert((flags & ~(GLOB_NOSORT | GLOB_ERR)) == 0);
654
655 hFind = FindFirstFileW(pattern, &dat);
656 if (hFind == INVALID_HANDLE_VALUE) {
657 err = GetLastError();
658 if (err == ERROR_FILE_NOT_FOUND) {
659 errno = 0;
660 return GLOB_NOMATCH;
661 } else {
662 set_errno_from_win32_error(err);
663 return GLOB_ABORTED;
664 }
665 }
666 pglob->gl_pathc = 0;
667 pglob->gl_pathv = NULL;
668 nspaces = 0;
669 do {
670 wchar_t *path;
671 if (pglob->gl_pathc == nspaces) {
672 size_t new_nspaces;
673 wchar_t **pathv;
674
675 new_nspaces = nspaces * 2 + 1;
676 pathv = REALLOC(pglob->gl_pathv,
677 new_nspaces * sizeof(pglob->gl_pathv[0]));
678 if (!pathv)
679 goto oom;
680 pglob->gl_pathv = pathv;
681 nspaces = new_nspaces;
682 }
683 size_t filename_len = wcslen(dat.cFileName);
684 size_t len_needed = prefix_len + filename_len;
685
686 path = MALLOC((len_needed + 1) * sizeof(wchar_t));
687 if (!path)
688 goto oom;
689
690 wmemcpy(path, pattern, prefix_len);
691 wmemcpy(path + prefix_len, dat.cFileName, filename_len + 1);
692 pglob->gl_pathv[pglob->gl_pathc++] = path;
693 } while (FindNextFileW(hFind, &dat));
694 err = GetLastError();
695 CloseHandle(hFind);
696 if (err != ERROR_NO_MORE_FILES) {
697 set_errno_from_win32_error(err);
698 ret = GLOB_ABORTED;
699 goto fail_globfree;
700 }
701 return 0;
702
703 oom:
704 CloseHandle(hFind);
705 errno = ENOMEM;
706 ret = GLOB_NOSPACE;
707 fail_globfree:
708 errno_save = errno;
709 globfree(pglob);
710 errno = errno_save;
711 return ret;
712 }
713
714 void
globfree(glob_t * pglob)715 globfree(glob_t *pglob)
716 {
717 size_t i;
718 for (i = 0; i < pglob->gl_pathc; i++)
719 FREE(pglob->gl_pathv[i]);
720 FREE(pglob->gl_pathv);
721 }
722
723 /* Replacement for fopen(path, "a") that doesn't prevent other processes from
724 * reading the file */
725 FILE *
win32_open_logfile(const wchar_t * path)726 win32_open_logfile(const wchar_t *path)
727 {
728 HANDLE h;
729 int fd;
730 FILE *fp;
731
732 h = CreateFile(path, FILE_APPEND_DATA, FILE_SHARE_VALID_FLAGS,
733 NULL, OPEN_ALWAYS, 0, NULL);
734 if (h == INVALID_HANDLE_VALUE)
735 return NULL;
736
737 fd = _open_osfhandle((intptr_t)h, O_APPEND);
738 if (fd < 0) {
739 CloseHandle(h);
740 return NULL;
741 }
742
743 fp = fdopen(fd, "a");
744 if (!fp) {
745 close(fd);
746 return NULL;
747 }
748
749 return fp;
750 }
751
752 #define RtlGenRandom SystemFunction036
753 BOOLEAN WINAPI RtlGenRandom(PVOID RandomBuffer, ULONG RandomBufferLength);
754
755 /*
756 * Generate @n cryptographically secure random bytes (thread-safe)
757 *
758 * This is the Windows version. It uses RtlGenRandom() (actually called
759 * SystemFunction036) from advapi32.dll.
760 */
761 void
get_random_bytes(void * p,size_t n)762 get_random_bytes(void *p, size_t n)
763 {
764 while (n != 0) {
765 u32 count = min(n, UINT32_MAX);
766
767 if (!RtlGenRandom(p, count)) {
768 win32_error(GetLastError(),
769 L"RtlGenRandom() failed (count=%u)", count);
770 wimlib_assert(0);
771 count = 0;
772 }
773 p += count;
774 n -= count;
775 }
776 }
777
778 /* Retrieve the current time as a WIM timestamp. */
779 u64
now_as_wim_timestamp(void)780 now_as_wim_timestamp(void)
781 {
782 FILETIME ft;
783
784 GetSystemTimeAsFileTime(&ft);
785
786 return ((u64)ft.dwHighDateTime << 32) | ft.dwLowDateTime;
787 }
788
789 #endif /* __WIN32__ */
790