- Use a RAII object to close the FD.
- Use sys::StrError instead of thread-unsafe strerror calls.
- Recover gracefully if read returns zero. This works around an issue on
DragonFlyBSD where /dev/null has an st_size of 136 but we can't read 136 bytes
from it.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100106 91177308-0d34-0410-b5e6-96231b3b80d8