as to why it's not possible for AF_INET... it's obviously not going to work between different hosts (we are, in effect, passing pointers to opened struct file instances; descriptors are converted to such pointers on the sending end and pointers are inserted into descriptor table by recepient; resulting descriptor numbers are stored in ancillary data returned to userland). And doing that when both ends are on the same host would result in a headache from hell, since we'd need all garbage-collecting machinery for AF_UNIX to apply to AF_INET as well.
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