def _devFDImplementation(self):
        dname = "/dev/fd"
        result = [int(fd) for fd in self.listdir(dname)]
        return result
Sets a failure reason.
dataset/ETHPy150Open twisted/twisted/twisted/internet/process.py/_FDDetector._devFDImplementation--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/google/net/proto2/python/public/service.py/RpcController.SetFailed