You proposed > write() is atomic, but may not write the number of bytes asked to write. as an alternative formulation, but I'm not sure what that's even suppo

You proposed > write() is atomic, but may not write the number of bytes asked to write. as an alternative formulation, but I'm not sure what that's even supposed to mean, semantically. "Atomic" literally means "indivisible" (well, "cannot cut" or "un-cuttable"). So either "all of it" or "none of it". Can you expound?