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* fhandler_registry.cc (perf_data_files): New table. 

(PERF_DATA_FILE_COUNT): New constant.
	(fhandler_registry::exists): Add check for HKEY_PERFORMANCE_DATA
	value names.
	(fhandler_registry::fstat): For HKEY_PERFORMANCE_DATA, return
	default values only.
	(fhandler_registry::readdir): For HKEY_PERFORMANCE_DATA, list
	names from perf_data_files only.
	(fhandler_registry::fill_filebuf): Use larger buffer to speed up
	access to HKEY_PERFORMANCE_DATA values.  Remove check for possible
	subkey.  Add RegCloseKey ().
	(open_key): Replace goto by break, remove label.  Do not try to
	open subkey of HKEY_PERFORMANCE_DATA.  Add missing RegCloseKey ()
	after open subkey error.
This commit is contained in:
Corinna Vinschen 2008-12-19 14:31:40 +00:00
parent 292c99741d
commit 887eb76fca
2 changed files with 77 additions and 13 deletions
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17
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,20 @@
2008-12-19 Christian Franke <franke@computer.org>
* fhandler_registry.cc (perf_data_files): New table.
(PERF_DATA_FILE_COUNT): New constant.
(fhandler_registry::exists): Add check for HKEY_PERFORMANCE_DATA
value names.
(fhandler_registry::fstat): For HKEY_PERFORMANCE_DATA, return
default values only.
(fhandler_registry::readdir): For HKEY_PERFORMANCE_DATA, list
names from perf_data_files only.
(fhandler_registry::fill_filebuf): Use larger buffer to speed up
access to HKEY_PERFORMANCE_DATA values. Remove check for possible
subkey. Add RegCloseKey ().
(open_key): Replace goto by break, remove label. Do not try to
open subkey of HKEY_PERFORMANCE_DATA. Add missing RegCloseKey ()
after open subkey error.
2008-12-19 Corinna Vinschen <corinna@vinschen.de>
* path.cc (path_conv::check): Handle incoming DOS paths non-POSIXy,

73
winsup/cygwin/fhandler_registry.cc
View File

@ -75,6 +75,22 @@ static const char *special_dot_files[] =
static const int SPECIAL_DOT_FILE_COUNT =
(sizeof (special_dot_files) / sizeof (const char *)) - 1;
/* Value names for HKEY_PERFORMANCE_DATA.
*
* CAUTION: Never call RegQueryValueEx (HKEY_PERFORMANCE_DATA, "Add", ...).
* It WRITES data and may destroy the perfc009.dat file. Same applies to
* name prefixes "Ad" and "A".
*/
static const char * const perf_data_files[] =
{
"@",
"Costly",
"Global"
};
static const int PERF_DATA_FILE_COUNT =
sizeof (perf_data_files) / sizeof (perf_data_files[0]);
static HKEY open_key (const char *name, REGSAM access, DWORD wow64, bool isValue);
/* Return true if char must be encoded.
@ -273,6 +289,24 @@ fhandler_registry::exists ()
if (hKey == (HKEY) INVALID_HANDLE_VALUE)
return 0;
if (hKey == HKEY_PERFORMANCE_DATA)
{
/* RegEnumValue () returns garbage for this key.
RegQueryValueEx () returns a PERF_DATA_BLOCK even
if a value does not contain any counter objects.
So allow access to the generic names and to
(blank separated) lists of counter numbers.
Never allow access to "Add", see above comment. */
for (int i = 0; i < PERF_DATA_FILE_COUNT && file_type == 0; i++)
{
if (strcasematch (perf_data_files[i], file))
file_type = -1;
}
if (file_type == 0 && !file[strspn (file, " 0123456789")])
file_type = -1;
goto out;
}
if (!val_only && dec_file[0])
{
while (ERROR_SUCCESS ==
@ -376,7 +410,11 @@ fhandler_registry::fstat (struct __stat64 *buf)
open_key (path, STANDARD_RIGHTS_READ | KEY_QUERY_VALUE, wow64,
(file_type < 0) ? true : false);
if (hKey != (HKEY) INVALID_HANDLE_VALUE)
if (hKey == HKEY_PERFORMANCE_DATA)
/* RegQueryInfoKey () always returns write time 0,
RegQueryValueEx () does not return required buffer size. */
;
else if (hKey != (HKEY) INVALID_HANDLE_VALUE)
{
FILETIME ftLastWriteTime;
DWORD subkey_count;
@ -474,6 +512,18 @@ fhandler_registry::readdir (DIR *dir, dirent *de)
res = 0;
goto out;
}
if ((HKEY) dir->__handle == HKEY_PERFORMANCE_DATA)
{
/* RegEnumValue () returns garbage for this key,
simulate only a minimal listing of the generic names. */
if (dir->__d_position >= SPECIAL_DOT_FILE_COUNT + PERF_DATA_FILE_COUNT)
goto out;
strcpy (de->d_name, perf_data_files[dir->__d_position - SPECIAL_DOT_FILE_COUNT]);
dir->__d_position++;
res = 0;
goto out;
}
retry:
if (dir->__d_position & REG_ENUM_VALUES_MASK)
/* For the moment, the type of key is ignored here. when write access is added,
@ -782,23 +832,21 @@ fhandler_registry::fill_filebuf ()
bufalloc = 0;
do
{
bufalloc += 1000;
bufalloc += 16 * 1024;
filebuf = (char *) crealloc_abort (filebuf, bufalloc);
size = bufalloc;
error = RegQueryValueEx (handle, value_name, NULL, &type,
(BYTE *) filebuf, &size);
if (error != ERROR_SUCCESS && error != ERROR_MORE_DATA)
{
if (error != ERROR_FILE_NOT_FOUND)
{
seterrno_from_win_error (__FILE__, __LINE__, error);
return true;
}
goto value_not_found;
seterrno_from_win_error (__FILE__, __LINE__, error);
return false;
}
}
while (error == ERROR_MORE_DATA);
filesize = size;
/* RegQueryValueEx () opens HKEY_PERFORMANCE_DATA. */
RegCloseKey (handle);
}
return true;
value_not_found:
@ -851,9 +899,9 @@ open_key (const char *name, REGSAM access, DWORD wow64, bool isValue)
if (*name)
name++;
if (*name == 0 && isValue == true)
goto out;
break;
if (val_only || !component[0])
if (val_only || !component[0] || hKey == HKEY_PERFORMANCE_DATA)
{
set_errno (ENOENT);
if (parentOpened)
@ -874,14 +922,14 @@ open_key (const char *name, REGSAM access, DWORD wow64, bool isValue)
REG_OPTION_BACKUP_RESTORE,
effective_access | wow64, NULL,
&hKey, NULL);
if (parentOpened)
RegCloseKey (hParentKey);
if (error != ERROR_SUCCESS)
{
hKey = (HKEY) INVALID_HANDLE_VALUE;
seterrno_from_win_error (__FILE__, __LINE__, error);
return hKey;
}
if (parentOpened)
RegCloseKey (hParentKey);
hParentKey = hKey;
parentOpened = true;
}
@ -895,7 +943,6 @@ open_key (const char *name, REGSAM access, DWORD wow64, bool isValue)
hParentKey = hKey;
}
}
out:
return hKey;
}