> On 2015-11-12 01:30, Theo de Raadt wrote: > >> I find this conversation puzzling, since even back in BSD 4.3, read() > >> was > >> actually implemented by memory mapping the underlying file. > > > > That is an wildly incorrect description of the 4.3 BSD buffer cache, > > furthermore 4.3 lacked a working mmap() to hit the coherency issue. > > Wait, so if you make a read-only mmap(), will the buffer in OpenBSD be > "unified" in the sense that fwrite():s always will be immediately > visible in the memory mapped version?
My reply is specifically about what Howard said. > (This is what I understood that Howard suggested would apply from BSD > 4.3 and on and Theo now said not was correct, so, my question is if that > behavior was introduced later in OpenBSD.) I made none of the claims you are composing.
