The problem then is how tee finds out the pid of the producer process?

The monitor could use a syntax similar to strace. 

limit_output 1_000_000 monitored_process.exe

[download]

Having launched the monitored process puts limit_output in a position to monitor and control it.

Update: Ah shoot. I think you already mentioned this.

In reply to Re^4: Windows-specific: Limiting output of created files by ikegami
in thread Windows-specific: Limiting output of created files by rovf

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