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* net.cc (call_gaa): New thread function to call GetAdaptersAddresses.

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(get_adapters_addresses): Call call_gaa.  If necessary, call it as
	child thread.  Explain why that's necessary.
This commit is contained in:
Corinna Vinschen 2012-03-08 16:02:44 +00:00
parent efb1f061f1
commit 3e25449aa5
2 changed files with 56 additions and 15 deletions
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6
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,9 @@
2012-03-08 Václav Zeman <vhaisman@gmail.com>
* net.cc (call_gaa): New thread function to call GetAdaptersAddresses.
(get_adapters_addresses): Call call_gaa. If necessary, call it as
child thread. Explain why that's necessary.
2012-03-08 Václav Zeman <vhaisman@gmail.com>
* path.cc (readlink): Avoid calling strlen() twice.

65
winsup/cygwin/net.cc
View File

@ -1650,36 +1650,71 @@ ip_addr_prefix (PIP_ADAPTER_UNICAST_ADDRESS pua, PIP_ADAPTER_PREFIX pap)
#define GAA_FLAG_INCLUDE_ALL_INTERFACES 0x0100
#endif
bool
get_adapters_addresses (PIP_ADAPTER_ADDRESSES *pa_ret, ULONG family)
struct gaa_wa {
ULONG family;
PIP_ADAPTER_ADDRESSES *pa_ret;
};
DWORD WINAPI
call_gaa (LPVOID param)
{
DWORD ret, size = 0;
gaa_wa *p = (gaa_wa *) param;
PIP_ADAPTER_ADDRESSES pa0 = NULL;
if (!pa_ret)
return ERROR_BUFFER_OVERFLOW
== GetAdaptersAddresses (family, GAA_FLAG_INCLUDE_PREFIX
if (!p->pa_ret)
return GetAdaptersAddresses (p->family, GAA_FLAG_INCLUDE_PREFIX
| GAA_FLAG_INCLUDE_ALL_INTERFACES,
NULL, NULL, &size);
NULL, NULL, &size);
do
{
ret = GetAdaptersAddresses (family, GAA_FLAG_INCLUDE_PREFIX
| GAA_FLAG_INCLUDE_ALL_INTERFACES,
ret = GetAdaptersAddresses (p->family, GAA_FLAG_INCLUDE_PREFIX
| GAA_FLAG_INCLUDE_ALL_INTERFACES,
NULL, pa0, &size);
if (ret == ERROR_BUFFER_OVERFLOW
&& !(pa0 = (PIP_ADAPTER_ADDRESSES) realloc (pa0, size)))
break;
}
while (ret == ERROR_BUFFER_OVERFLOW);
if (ret != ERROR_SUCCESS)
if (pa0)
{
if (pa0)
free (pa0);
*pa_ret = NULL;
return false;
if (ret != ERROR_SUCCESS)
{
free (pa0);
*p->pa_ret = pa0;
}
else
*p->pa_ret = pa0;
}
*pa_ret = pa0;
return true;
return ret;
}
bool
get_adapters_addresses (PIP_ADAPTER_ADDRESSES *pa_ret, ULONG family)
{
DWORD ret;
gaa_wa param = { family, pa_ret ?: NULL };
if ((uintptr_t) &param >= (uintptr_t) 0x80000000L)
{
/* Starting with Windows Vista, GetAdaptersAddresses fails with error 998,
if it's running in a thread with a stack located in the large address
area. So, if we're running in a pthread with such a stack, we call
GetAdaptersAddresses in a child thread with an OS-allocated stack,
which is guaranteed to be located in the lower address area. */
HANDLE thr = CreateThread (NULL, 0, call_gaa, &param, 0, NULL);
if (!thr)
{
debug_printf ("CreateThread: %E");
return false;
}
WaitForSingleObject (thr, INFINITE);
GetExitCodeThread (thr, &ret);
CloseHandle (thr);
}
else
ret = call_gaa (&param);
return ret == ERROR_SUCCESS || (!pa_ret && ret == ERROR_BUFFER_OVERFLOW);
}
#define WS_IFF_UP 1