I don't see what that has anything to do with unix or stdio? The read/write syscalls will happily transfer much larger buffers. If an application invokes the sy

I don't see what that has anything to do with unix or stdio? The read/write syscalls will happily transfer much larger buffers. If an application invokes the syscalls directly with 1-byte chunks it's on the application. userspace IO buffering to amortize syscall costs exists in pretty much every language.