s6-linux-init and ttys in lxc containers

["Hoël Bézier" <hoelbezier@leanco.fr>]

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Hi,

I’m using s6 and s6-linux-init inside lxc containers.

My /sbin/init (created with s6-linux-init-maker) contains the following:

```
#!/bin/execlineb -S0

s6-linux-init -c "/etc/s6-linux-init/current" -m 0022 -p "/usr/bin:/bin" -C -- "$@"
```

Right after starting my container with `lxc-start -F <container-name>`, I get 
the following warning message:

s6-linux-init: warning: unable to ttyname stdout: No such device

I suspect this is due to the mechanism described on 
https://github.com/lxc/lxd/issues/1724#issuecomment-194412831, although I’m not 
using LXD, only lxc (which does not have a daemon running as root). Note that 
s6-linux-init has been compiled against the musl libc, so the musl ttyname C 
function may have the same issue as the glibc one.

That’s not a really serious issue, but I figured I’d still mention it here.

Hoël

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