Date: Sun, 21 Oct 2001 19:44:31 +1000 (EST) From: Bruce Evans <bde@zeta.org.au> 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 Message-ID: <20011021190723.I46880-100000@delplex.bde.org> In-Reply-To: <20011021071754.CF876380A@overcee.netplex.com.au>
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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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