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由 Daniel P. Berrange 提交于
Currently when launching the LXC controller we first write out the plain, inactive XML configuration, then launch the controller, then replace the file with the live status XML configuration. By good fortune this hasn't caused any problems other than some misleading error messages during failure scenarios. This simplifies the code so it only writes out the XML once and always writes the live status XML. To do this we need to handshake with the child process, to make execution pause just before exec() so we can write the XML status with the child PID present.
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