Lennart Poettering
b411228199
In PID 1 we write status information to /dev/console regularly, but we cannot keep it open continously, due to the kernel's SAK logic (which would kill PID 1 if user hits SAK). But closing/reopening it all the time really sucks for tty types that have no window size management (such as serial terminals/hvc0 and suchlike), because it also means the TTY is fully closed most of the time, and that resets the window sizes to 0/0. Now, we reinitialize the window size on every reopen, but that is a bit expensive for simple status output. Hence, cache the window size in the usualy $COLUMNS/$ROWS environment variables. We don't inherit these to our payloads anyway, hence these are free to us to use.
System and Service Manager
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