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* autoload.cc (RETRY_COUNT): New define. 

(std_dll_init): Restructure loop to retry loading a DLL only if
	specific errors occur.  If these errors persist, try to load DLL
	with name only.
This commit is contained in:
Corinna Vinschen 2010-12-09 16:50:36 +00:00
parent 23dbdc2aaa
commit 0dcfb061cf
2 changed files with 39 additions and 14 deletions
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7
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,10 @@
2010-12-09 Corinna Vinschen <corinna@vinschen.de>
* autoload.cc (RETRY_COUNT): New define.
(std_dll_init): Restructure loop to retry loading a DLL only if
specific errors occur. If these errors persist, try to load DLL
with name only.
2010-12-08 Corinna Vinschen <corinna@vinschen.de>
* include/strings.h: Remove in favor of equivalent newlib file.

46
winsup/cygwin/autoload.cc
View File

@ -204,6 +204,8 @@ union retchain
long long ll;
};
#define RETRY_COUNT 10
/* The standard DLL initialization routine. */
__attribute__ ((used, noinline)) static long long
std_dll_init ()
@ -221,27 +223,43 @@ std_dll_init ()
while (InterlockedIncrement (&dll->here));
else if (!dll->handle)
{
HANDLE h;
fenv_t fpuenv;
fegetenv (&fpuenv);
WCHAR dll_path[MAX_PATH];
DWORD err = ERROR_SUCCESS;
/* http://www.microsoft.com/technet/security/advisory/2269637.mspx */
wcpcpy (wcpcpy (dll_path, windows_system_directory), dll->name);
dll->handle = NULL;
/* MSDN seems to imply that LoadLibrary can fail mysteriously, so,
since there have been reports of this in the mailing list, retry
several times before giving up. */
for (int i = 1; !dll->handle && i <= 5; i++)
if ((h = LoadLibraryW (dll_path)) != NULL)
dll->handle = h;
/* FIXME: This isn't quite right. Probably should check for specific
error codes. */
else if ((func->decoration & 1))
dll->handle = INVALID_HANDLE_VALUE;
else if (i < 5)
yield ();
else
api_fatal ("could not load %W, %E", dll_path);
several times before giving up. */
for (int i = 1; i <= RETRY_COUNT; i++)
{
/* If loading the library succeeds, just leave the loop. */
if ((dll->handle = LoadLibraryW (dll_path)) != NULL)
break;
/* Otherwise check error code returned by LoadLibrary. If the
error code is neither NOACCESS nor DLL_INIT_FAILED, break out
of the loop. */
err = GetLastError ();
if (err != ERROR_NOACCESS && err != ERROR_DLL_INIT_FAILED)
break;
if (i < RETRY_COUNT)
yield ();
}
if (!dll->handle)
{
/* If LoadLibrary with full path returns one of the weird errors
reported on the Cygwin mailing list, retry with only the DLL
name. Checking the error codes allows to restrict loading
with just the DLL name to this specific problem. */
if ((err == ERROR_NOACCESS || err == ERROR_DLL_INIT_FAILED)
&& (dll->handle = LoadLibraryW (dll->name)) != NULL)
;
else if ((func->decoration & 1))
dll->handle = INVALID_HANDLE_VALUE;
else
api_fatal ("could not load %W, %E", dll_path);
}
fesetenv (&fpuenv);
}