Date: Fri, 08 Mar 2002 11:10:37 +0100 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: Terry Lambert <tlambert2@mindspring.com> Cc: Luigi Rizzo <rizzo@icir.org>, arch@FreeBSD.ORG Subject: Re: Proposed patch: kern.bootdev* sysctl variables Message-ID: <15269.1015582237@critter.freebsd.dk> In-Reply-To: Your message of "Fri, 08 Mar 2002 02:08:54 PST." <3C888DB6.8DF80EE7@mindspring.com>
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In message <3C888DB6.8DF80EE7@mindspring.com>, Terry Lambert writes: >Luigi Rizzo wrote: >> Any objection to the following patch to i386/i386/autoconf.c >> to let userland apps know [an approximation of] the name >> of the device the kernel was booted from ? >> >> The main use would be for startup scripts, such as >> /etc/rc, which could this way differentiate their >> behaviour based on the returned result. >> >> (I know it can be perfected by not assuming that >> any hard disk is /dev/ad, but you get the idea...) > >If you grabbed the actual boot information from the >tunables in the loader environment (using TUNABLE >macros), you could get the actual thing. But that might not be the real thing. The kernel will ask for a root if it's initial instruction is wrong, so you cannot return the hint from the bootloader unless you know for sure that you actually ended up using that. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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