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A comment on Much faster incremental apt updates. Parent comment

Re:Much faster incremental apt updates by ars on Monday December 28, 2015 @01:01AM (#10800102)
I believe mmap is not fully portable without extra work, so they avoid it - debian runs on a LOT of different systems.
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Re:Much faster incremental apt updates by legulere on Monday December 28, 2015 @01:28AM (#10800169)
It was developed inside the original BSD and is part of POSIX. So it's supported on all unixes today. The only place it isn't supported is Windows.
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Re:Much faster incremental apt updates by icefox on Monday December 28, 2015 @09:56AM (#10801333)
It is everywhere even Windows. There is a little bit of weirdness on some older versions of Windows CE and some undefined behavior with edge conditions on some OS's if I recall, but you can find the capability everywhere. I added the map API to QFile back in the day and went through checking different OS's for compatibility. A quick google search here is a link to the windows method:

https://github.com/radekp/qt/blob/master/src/corelib/io/qfsf...

unix version: https://github.com/radekp/qt/blob/master/src/corelib/io/qfsf...

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