Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!mips!zorba!dtynan
From: guy@auspex.UUCP (Guy Harris)
Newsgroups: comp.unix
Subject: Re: Does anyone have a tar or cpio that will use remote devices?
Message-ID: <3567@zorba.Tynan.COM>
Date: 7 Mar 90 23:44:37 GMT
References: <3534@zorba.Tynan.COM> <3535@zorba.Tynan.COM> <3546@zorba.Tynan.COM>
Sender: dtynan@zorba.Tynan.COM
Organization: Auspex Systems, Santa Clara
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Approved: dtynan@zorba.Tynan.COM

>>just a note -- sV RFS allows one to remote-mount the entire /dev directory...
>
>What happens if the kernels are different?  Is there any protection
>against, say, /dev/lp having world read/write and major/minor numbers
>corresponding to /dev/mem?

No, but there doesn't have to be.  If you mount a "/dev" directory from
another machine, all accesses to devices in that directory go over the
wire and access the remote machine's devices, using the *remote*
machine's interpretation of the major and minor numbers.  So, even if
"/dev/lp" on the remote machine had the same major/minor as "/dev/mem"
on your machine, using "/mnt/dev/lp" or whatever would refer to the
printer on the remote machine, not physical memory on your machine.