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I don't believe puts is performing unbuffered I/O though. It's a libc function, not a direct syscall. Correct me if I'm wrong of course

The write(2) libc function is just a C wrapper for the syscall. It's the functions from stdio.h that are buffered.

Ah ok sorry I got confused by the comments nesting level. I thought we were talking about the OpenBSD's version which uses puts