#include "wimlib/file_io.h"
#include "wimlib/glob.h"
#include "wimlib/error.h"
+#include "wimlib/wildcard.h"
#include "wimlib/util.h"
/* Replacement for POSIX fsync() */
return -1;
}
-/* Use the Win32 API to get the number of processors */
+/* Use the Win32 API to get the number of processors. */
unsigned
win32_get_number_of_processors(void)
{
return sysinfo.dwNumberOfProcessors;
}
+/* Use the Win32 API to get the amount of available memory. */
+u64
+win32_get_avail_memory(void)
+{
+ MEMORYSTATUSEX status = {
+ .dwLength = sizeof(status),
+ };
+ GlobalMemoryStatusEx(&status);
+ return status.ullTotalPhys;
+}
+
/* Replacement for POSIX-2008 realpath(). Warning: partial functionality only
* (resolved_path must be NULL). Also I highly doubt that GetFullPathName
* really does the right thing under all circumstances. */
ret = GetFullPathNameW(path, ret, resolved_path, NULL);
if (!ret) {
err = GetLastError();
- free(resolved_path);
+ FREE(resolved_path);
resolved_path = NULL;
goto fail_win32;
}
return resolved_path;
}
-/* rename() on Windows fails if the destination file exists. And we need to
- * make it work on wide characters. Fix it. */
+/* A quick hack to get reasonable rename() semantics on Windows, in particular
+ * deleting the destination file instead of failing with ERROR_FILE_EXISTS and
+ * working around any processes that may have the destination file open.
+ *
+ * Note: This is intended to be called when overwriting a regular file with an
+ * updated copy and is *not* a fully POSIX compliant rename(). For that you may
+ * wish to take a look at Cygwin's implementation, but be prepared...
+ *
+ * Return 0 on success, -1 on regular error, or 1 if the destination file was
+ * deleted but the source could not be renamed and therefore should not be
+ * deleted.
+ */
int
-win32_rename_replacement(const wchar_t *oldpath, const wchar_t *newpath)
+win32_rename_replacement(const wchar_t *srcpath, const wchar_t *dstpath)
{
- if (MoveFileExW(oldpath, newpath, MOVEFILE_REPLACE_EXISTING)) {
+ wchar_t *tmpname;
+
+ /* Normally, MoveFileExW() with the MOVEFILE_REPLACE_EXISTING flag does
+ * what we want. */
+
+ if (MoveFileExW(srcpath, dstpath, MOVEFILE_REPLACE_EXISTING))
return 0;
- } else {
+
+ /* MoveFileExW() failed. One way this can happen is if any process has
+ * the destination file open, in which case ERROR_ACCESS_DENIED is
+ * produced. This can commonly happen if there is a backup or antivirus
+ * program monitoring or scanning the files. This behavior is very
+ * different from the behavior of POSIX rename(), which simply unlinks
+ * the destination file and allows other processes to keep it open! */
+
+ if (GetLastError() != ERROR_ACCESS_DENIED)
+ goto err_set_errno;
+
+ /* We can work around the above-mentioned problem by renaming the
+ * destination file to yet another temporary file, then "deleting" it,
+ * which on Windows will in fact not actually delete it immediately but
+ * rather mark it for deletion when the last handle to it is closed. */
+ {
+ static const wchar_t orig_suffix[5] = L".orig";
+ const size_t num_rand_chars = 9;
+ wchar_t *p;
+
+ size_t dstlen = wcslen(dstpath);
+
+ tmpname = alloca(sizeof(wchar_t) *
+ (dstlen + ARRAY_LEN(orig_suffix) + num_rand_chars + 1));
+ p = tmpname;
+ p = wmempcpy(p, dstpath, dstlen);
+ p = wmempcpy(p, orig_suffix, ARRAY_LEN(orig_suffix));
+ randomize_char_array_with_alnum(p, num_rand_chars);
+ p += num_rand_chars;
+ *p = L'\0';
+ }
+
+ if (!MoveFile(dstpath, tmpname))
+ goto err_set_errno;
+
+ if (!DeleteFile(tmpname)) {
set_errno_from_GetLastError();
- return -1;
+ WARNING_WITH_ERRNO("Failed to delete original file "
+ "(moved to \"%ls\")", tmpname);
}
-}
-/* Replacement for POSIX fnmatch() (partial functionality only) */
-int
-fnmatch(const wchar_t *pattern, const wchar_t *string, int flags)
-{
- if (PathMatchSpecW(string, pattern))
- return 0;
- else
- return FNM_NOMATCH;
+ if (!MoveFile(srcpath, dstpath)) {
+ set_errno_from_GetLastError();
+ WARNING_WITH_ERRNO("Atomic semantics not respected in "
+ "failed rename() (new file is at \"%ls\")",
+ srcpath);
+ return 1;
+ }
+
+ return 0;
+
+err_set_errno:
+ set_errno_from_GetLastError();
+ return -1;
}
/* truncate() replacement */
return do_pread_or_pwrite(fd, (void*)buf, count, offset, true);
}
-/* Dumb Windows implementation of writev(). It writes the vectors one at a
- * time. */
-ssize_t writev(int fd, const struct iovec *iov, int iovcnt)
-{
- ssize_t total_bytes_written = 0;
-
- if (iovcnt <= 0) {
- errno = EINVAL;
- return -1;
- }
- for (int i = 0; i < iovcnt; i++) {
- ssize_t bytes_written;
-
- bytes_written = write(fd, iov[i].iov_base, iov[i].iov_len);
- if (bytes_written >= 0)
- total_bytes_written += bytes_written;
- if (bytes_written != iov[i].iov_len) {
- if (total_bytes_written == 0)
- total_bytes_written = -1;
- break;
- }
- }
- return total_bytes_written;
-}
-
int
win32_get_file_and_vol_ids(const wchar_t *path, u64 *ino_ret, u64 *dev_ret)
{
HANDLE hFind;
int ret;
size_t nspaces;
+ int errno_save;
const wchar_t *backslash, *end_slash;
size_t prefix_len;
errno = 0;
return GLOB_NOMATCH;
} else {
- /* The other possible error codes for FindFirstFile()
- * are undocumented. */
- errno = EIO;
+ set_errno_from_win32_error(err);
return GLOB_ABORTED;
}
}
} while (FindNextFileW(hFind, &dat));
err = GetLastError();
CloseHandle(hFind);
- if (err == ERROR_NO_MORE_FILES) {
- errno = 0;
- return 0;
- } else {
- /* Other possible error codes for FindNextFile() are
- * undocumented */
- errno = EIO;
+ if (err != ERROR_NO_MORE_FILES) {
+ set_errno_from_win32_error(err);
ret = GLOB_ABORTED;
goto fail_globfree;
}
+ return 0;
+
oom:
CloseHandle(hFind);
errno = ENOMEM;
ret = GLOB_NOSPACE;
fail_globfree:
+ errno_save = errno;
globfree(pglob);
+ errno = errno_save;
return ret;
}
{
size_t i;
for (i = 0; i < pglob->gl_pathc; i++)
- free(pglob->gl_pathv[i]);
- free(pglob->gl_pathv);
+ FREE(pglob->gl_pathv[i]);
+ FREE(pglob->gl_pathv);
}
#endif /* __WIN32__ */
git://wimlib.net / wimlib / blobdiff