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Passing fds via pipes?!Passing fds via pipes?!Posted Jul 30, 2009 0:01 UTC (Thu) by i3839 (guest, #31386)In reply to: GNU + Linux = broken development model by nix Parent article: A tempest in a tty pot
> TTY users can be people who accept file descriptors via
> pipes and have no idea there are TTYs at the other end
How is this possible? Did you mean unix domain sockets instead of pipes?
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Passing fds via pipes?! Posted Jul 30, 2009 0:37 UTC (Thu) by nix (subscriber, #2304) [Link]
Wrong way round. An fd to a TTY can be passed over a unix-domain socket
and then used (which will trigger line discipline magic even though the app has no idea it's using it), so it's using a TTY even though it never opened it or looked at /dev/ptmx. (This is probably not common, but it makes a comprehensive audit of TTY users ridiculously hard, because use of AF_UNIX sockets *is* common and fd passing is not particularly rare. One variation of it, in which the fd is passed into the application as one of fds 0 to 2, is of course exceedingly common. You don't even need AF_UNIX sockets for that.)
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