I've got a bunch of servers running this Linux app. I'd like for them to be able to generate a GUID with a low probability of collision. I'm sure I could just pull 128 bytes out of /dev/urandom and that would probably be fine, but is there a simple & easy way to generate a GUID that is more equivalent to the Win32 one? Specifically, one that takes into account space (well, MAC address), time, and randomness? I don't want to call off the box for it, I just want something like CreateGuid()
This Internet Draft describes one type of UUID in great details and I have used a similar approach with great success when I needed a UUID implementation and could not link to an existing library for architectural reasons.
This article provides a good overview.
There is libuuid.
If you are going to use something then an Internet standard would be a good idea:
Check out RFC (Request For Comment).
The one I know that is specific to GUID is: RFC 4122
There is a Boost version available.
来源：https://stackoverflow.com/questions/153676/guids-in-a-c-linux-gcc-app