commit | 4bea6551ddb07f1d645d792779a49af325a97211 | [log] [tgz] |
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author | Colin Cross <ccross@android.com> | Tue Dec 21 13:54:40 2021 -0800 |
committer | Colin Cross <ccross@android.com> | Tue Jan 11 19:24:09 2022 -0800 |
tree | 2c5cebf96547ac0cd3df27997957a1c587d0cc25 | |
parent | 30dbe0193c149a30d043c378f4c810e114cde128 [diff] |
Add posix_strerror_r and ErrnoNumberAsString to libbase Calling strerror_r is tricky, as glibc provides the GNU version if _GNU_SOURCE is set, and musl libc only provides the posix version. Handle the complexity once in libbase to export a posix_strerror_r function, and move update_engine's ErrnoNumberAsString into libbase. Bug: 190084016 Test: m USE_HOST_MUSL=true host-native Test: atest --host libbase_test Change-Id: Ied24f5bb8cf34fc7948d129c368ee17adb1460e1
This library is a collection of convenience functions to make common tasks easier and less error-prone.
In this context, “error-prone” covers both “hard to do correctly” and “hard to do with good performance”, but as a general purpose library, libbase's primary focus is on making it easier to do things easily and correctly when a compromise has to be made between “simplest API” on the one hand and “fastest implementation” on the other. Though obviously the ideal is to have both.
The intention is to cover the 80% use cases, not be all things to all users.
If you have a routine that‘s really useful in your project, congratulations. But that doesn’t mean it should be here rather than just in your project.
The question for libbase is “should everyone be doing this?”/“does this make everyone's code cleaner/safer?”. Historically we've considered the bar for inclusion to be “are there at least three unrelated projects that would be cleaned up by doing so”.
If your routine is actually something from a future C++ standard (that isn‘t yet in libc++), or it’s widely used in another library, that helps show that there's precedent. Being able to say “so-and-so has used this API for n years” is a good way to reduce concerns about API choices.
Unlike most Android code, code in libbase has to build for Mac and Windows too.
Code here is also expected to have good test coverage.
By its nature, it‘s difficult to change libbase API. It’s often best to start using your routine just in your project, and let it “graduate” after you're certain that the API is solid.