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Make multiple attempts to open the tap device on Windows.

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This commit is contained in:
Adam Ierymenko 2014-03-27 18:50:10 -07:00
parent e3239d23f4
commit 881ff08269
1 changed files with 12 additions and 3 deletions
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15
node/EthernetTap.cpp
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@ -1287,6 +1287,7 @@ EthernetTap::EthernetTap(
CloseHandle(processInfo.hProcess);
CloseHandle(processInfo.hThread);
}
Sleep(250);
{
STARTUPINFOA startupInfo;
startupInfo.cb = sizeof(startupInfo);
@ -1309,14 +1310,22 @@ EthernetTap::EthernetTap(
}
if (devconLog != INVALID_HANDLE_VALUE)
CloseHandle(devconLog);
Sleep(250);
}
// Open the tap, which is in this weird Windows analog of /dev
char tapPath[4096];
Utils::snprintf(tapPath,sizeof(tapPath),"\\\\.\\Global\\%s.tap",_myDeviceInstanceId.c_str());
_tap = CreateFileA(tapPath,GENERIC_READ|GENERIC_WRITE,0,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_SYSTEM|FILE_FLAG_OVERLAPPED,NULL);
if (_tap == INVALID_HANDLE_VALUE)
throw std::runtime_error(std::string("unable to open tap device ")+tapPath);
for(int openTrials=0;;) {
// Try multiple times, since there seem to be reports from the field
// of driver init timing issues. Blech.
_tap = CreateFileA(tapPath,GENERIC_READ|GENERIC_WRITE,0,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_SYSTEM|FILE_FLAG_OVERLAPPED,NULL);
if (_tap == INVALID_HANDLE_VALUE) {
if (++openTrials >= 3)
throw std::runtime_error(std::string("unable to open tap device ")+tapPath);
else Sleep(500);
} else break;
}
// Set media status to enabled
uint32_t tmpi = 1;