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win32.c: open_special

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* win32/win32.c (open_special): extract to open existing file with
  backup semantics.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51702 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2015-08-27 03:57:56 +00:00
parent dc05dfd496
commit f64d6357b6
1 changed files with 18 additions and 17 deletions
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35
win32/win32.c
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@ -1837,6 +1837,17 @@ get_final_path(HANDLE f, WCHAR *buf, DWORD len, DWORD flag)
return func(f, buf, len, flag);
}
/* License: Ruby's */
/* TODO: better name */
static HANDLE
open_special(const WCHAR *path, DWORD access, DWORD flags)
{
const DWORD share_mode =
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE;
return CreateFileW(path, access, share_mode, NULL, OPEN_EXISTING,
FILE_FLAG_BACKUP_SEMANTICS|flags, NULL);
}
//
// The idea here is to read all the directory names into a string table
// (separated by nulls) and when one of the other dir functions is called
@ -1867,8 +1878,7 @@ open_dir_handle(const WCHAR *filename, WIN32_FIND_DATAW *fd)
// Create the search pattern
//
fh = CreateFileW(filename, 0, 0, NULL, OPEN_EXISTING,
FILE_FLAG_BACKUP_SEMANTICS, NULL);
fh = open_special(filename, 0, 0);
if (fh != INVALID_HANDLE_VALUE) {
len = get_final_path(fh, fullname, numberof(fullname), 0);
CloseHandle(fh);
@ -4730,10 +4740,7 @@ reparse_symlink(const WCHAR *path, rb_w32_reparse_buffer_t *rp, size_t size)
return ENOSYS;
}
f = CreateFileW(path, 0, FILE_SHARE_READ|FILE_SHARE_WRITE,
NULL, OPEN_EXISTING,
FILE_FLAG_BACKUP_SEMANTICS|FILE_FLAG_OPEN_REPARSE_POINT,
NULL);
f = open_special(path, 0, FILE_FLAG_OPEN_REPARSE_POINT);
if (f == INVALID_HANDLE_VALUE) {
return GetLastError();
}
@ -4974,11 +4981,8 @@ rb_w32_getenv(const char *name)
static DWORD
get_volume_serial_number(const WCHAR *path)
{
const DWORD share_mode = FILE_SHARE_READ | FILE_SHARE_WRITE;
const DWORD creation = OPEN_EXISTING;
const DWORD flags = FILE_FLAG_BACKUP_SEMANTICS;
BY_HANDLE_FILE_INFORMATION st = {0};
HANDLE h = CreateFileW(path, 0, share_mode, NULL, creation, flags, NULL);
HANDLE h = open_special(path, 0, 0);
BOOL ret;
if (h == INVALID_HANDLE_VALUE) return 0;
@ -5011,10 +5015,9 @@ wrename(const WCHAR *oldpath, const WCHAR *newpath)
return -1;
}
if (oldatts & FILE_ATTRIBUTE_REPARSE_POINT) {
HANDLE fh = CreateFileW(oldpath, 0, 0, NULL, OPEN_EXISTING,
FILE_FLAG_BACKUP_SEMANTICS, NULL);
HANDLE fh = open_special(oldpath, 0, 0);
if (fh == INVALID_HANDLE_VALUE) {
int e = GetLastError();
DWORD e = GetLastError();
if (e == ERROR_CANT_RESOLVE_FILENAME) {
errno = ELOOP;
return -1;
@ -5367,8 +5370,7 @@ winnt_stat(const WCHAR *path, struct stati64 *st)
HANDLE f;
memset(st, 0, sizeof(*st));
f = CreateFileW(path, 0, 0, NULL, OPEN_EXISTING,
FILE_FLAG_BACKUP_SEMANTICS, NULL);
f = open_special(path, 0, 0);
if (f != INVALID_HANDLE_VALUE) {
WCHAR finalname[MAX_PATH];
const DWORD attr = stati64_handle(f, st);
@ -7084,8 +7086,7 @@ wutime(const WCHAR *path, const struct utimbuf *times)
const DWORD attr = GetFileAttributesW(path);
if (attr != (DWORD)-1 && (attr & FILE_ATTRIBUTE_READONLY))
SetFileAttributesW(path, attr & ~FILE_ATTRIBUTE_READONLY);
hFile = CreateFileW(path, GENERIC_WRITE, 0, 0, OPEN_EXISTING,
FILE_FLAG_BACKUP_SEMANTICS, 0);
hFile = open_special(path, GENERIC_WRITE, 0);
if (hFile == INVALID_HANDLE_VALUE) {
errno = map_errno(GetLastError());
ret = -1;