Isn't stdout usually line buffered (or fully buffered). Does zig do something to turn this buffering off, or do we now have two sets of buffering? If so, how does one flush the underlying stream?
That buffering is done by libc not the OS. So no buffering if you write directly to stdout's OS file descriptor. In C, you'll observe the buffered IO if you use printf(3)/fprintf(3)/fwrite(3), but not if you used write(2) directly.
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Take off every Zig!