Date: Tue, 14 Sep 2004 11:52:36 -0700 From: Brooks Davis <brooks@one-eyed-alien.net> To: "Conrad J. Sabatier" <conrads@cox.net> Cc: freebsd-emulation@freebsd.org Subject: Re: /dev, /proc support in a chrooted Linux emulation environment Message-ID: <20040914185236.GA31186@odin.ac.hmc.edu> In-Reply-To: <20040914133535.3aa9ee21@dolphin.local.net> References: <20040914133535.3aa9ee21@dolphin.local.net>
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[-- Attachment #1 --] On Tue, Sep 14, 2004 at 01:35:35PM -0500, Conrad J. Sabatier wrote: > I've been exploring running Linux binaries under a chrooted Linux shell > (entering the environment via "chroot /compat/linux /bin/bash"). I've > had remarkable success in installing and running quite a few rpms beyond > those found in the linux_base port, but have found that /dev support (as > well as /proc) doesn't work as expected when running Linux apps within > such an environment. > > Programs/scripts attempting to access, for example, /dev/null complain > about no such file or device. The same for /dev/ttyX, /dev/zero, etc. > > Similar problems occur attempting to use /proc/*. I'm also experiencing > some networking problems, mainly with DNS resolution, but for now, my > main concern is /dev and /proc. > > I realize that the method I'm using for running Linux apps is not what > was intended with FreeBSD's Linux emulation mode, but it's interesting > enough that I want to continue delving into it. My goal is to have as > near-complete a working Linux environment as possible, one that would > support running practically any Linux app within this chrooted > environment and would, for all intents and purposes, appear as a "real" > Linux to any programs running within it. > > Are there any suggestions as to how I might remedy some of these > problems? Or is this simply beyond the scope/capabilities of the Linux > emulator at this time? You can provide a fairly complete linux /proc with linprocfs. /dev is more difficult. You can try mounting devfs in your linux /dev which may work for many applications. For the moment, you can also make nodes like /dev/null and /dev/zero with mknod, but I believe that functionality will be going away. I suspect we will eventually need a lindevfs to make devices show up the way linux wants them to. -- Brooks -- Any statement of the form "X is the one, true Y" is FALSE. PGP fingerprint 655D 519C 26A7 82E7 2529 9BF0 5D8E 8BE9 F238 1AD4 [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (GNU/Linux) iD8DBQFBRz3zXY6L6fI4GtQRApofAKC3i/RY5cMEss8OO2/xE+0rt6x7YgCcCBPw L0q/jHuwM8FtZin4wj0ZPpw= =FEU1 -----END PGP SIGNATURE-----help
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