From owner-cvs-all  Sun Oct 21  2:45:35 2001
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Date: Sun, 21 Oct 2001 19:44:31 +1000 (EST)
From: Bruce Evans <bde@zeta.org.au>
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To: Peter Wemm <peter@wemm.org>
Cc: Brian Somers <brian@FreeBSD.org>, <cvs-committers@FreeBSD.org>,
	<cvs-all@FreeBSD.org>
Subject: Re: cvs commit: src/sys/conf Makefile.i386 
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On Sun, 21 Oct 2001, Peter Wemm wrote:

> Brian Somers wrote:
> > brian       2001/10/17 06:57:32 PDT
> >
> >   Modified files:
> >     sys/conf             Makefile.i386
> >   Log:
> >   Change kern.bootfile when mv'ing the kernel
> ...
> This is incomplete..
> what if it is the second 'make install'?

This part is handled by the confusing logic.

> Nothing is supposed to be using this sysctl, it's purely informational
> these days, and even then it has only part of the story.  The booted kernel
> may not even be reachable (eg: on an EFI filesystem or pulled in via tftp).

_kvm_open() still uses getbootfile() unconditionally, so it's hard to
tell what uses the sysctl.

getbootfile() is also used by:
- savecore: doesn't use libkvm or kldsym, so it can only get the symbols
  from the kernel file.  More fundamentally, it can't save the kernel
  file if the kernel file is unreachable.
- syslogd: the name of the kernel file is used as a prefix.  If I kept
  kernels in the standard place, then I would have complained about the
  bloatage of syslogd output caused by renaming the kernel from /kernel
  to /boot/${NAME_OF_MY_KERNEL}/kernel
- trpt: doesn't use libkvm or kldsym.  It apparently never got converted
  to use libkvm.
- kgmon: uses libkvm, but bogusly calls getbootfile() itself instead of
  asking kvm_openfiles() for the default.

Related problems:
- gprof: needs to read the bootfile if used on kernels, since it doesn't
  use kldsym.  The bootfile name must be specified on the command line
  for kernels.  I normally use `sysctl -n kern.bootfile` to get it.

Not-so-related problems:
- kgmon: the change of the default output file name from gmon.out to
  <progam name>.gmon has not reached here, so you have to tell gprof
  the gmon filename too.

Bruce


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