如何重定向Tornado/VXWorks shell输出？

import sys

class Logger(object):
    def __init__(self, filename):
        self.stdout = sys.stdout
        sys.stdout = self
        self.logfile = open(filename, 'w')

    def write(self, data):
        self.stdout.write(data)
        self.logfile.write(data)

    def flush(self):
        pass

logger = Logger('output.log')

#include <vxWorks.h>
#include <ioLib.h>

void redirectOutput(int deviceId)
{
    int stdioFd = iosDevCreate("/tty", deviceId, 0, 0);
    iosDevRedirect(stdioFd, IOS_STDOUT);
    iosDevRedirect(stdioFd, IOS_STDERR);
}

import os

logfile = open('output.log', 'w')
os.dup2(logfile.fileno(), 1)  # 重定向标准输出
os.dup2(logfile.fileno(), 2)  # 重定向标准错误输出