Subject: Re: another kdump problem
To: None <Charles-Hannum@deshaw.com>
From: Niklas Hallqvist <email@example.com>
Date: 09/05/1995 20:43:02
>>>>> "Charles" == Charles Hannum <Charles-Hannum@deshaw.com> writes:
Niklas> 3 When not in append mode and when running on a kernel
Niklas> that supports the sysctls, ktrace will output a header
Niklas> containing a magic number and the emulation/syscall table in
Niklas> the ktrace.out dump.
Charles> I'm not sure this is right. When appending or using `-i' to
Charles> trace children, more than one process may be represented in
Charles> the ktrace file. It seems to me that you need a special
Charles> record for the syscall list, tagged with a pid and recorded
Charles> internally to kdump(1) by pid, and allow for the syscall list
Charles> to be replaced (i.e. after execve(2)).
But I do, in a way. I dump *all* syscall lists into the file
initially. Kdump maintains a pid->emulation mapping, with a default
of the native "netbsd" emulation used when a new pid is seen.
Whenever an EMUL record is seen in the stream the mapping is changed.
This works fine as all syscall lists are available.
Niklas Hallqvist Phone: +46-(0)31-40 75 00
Applitron Datasystem Fax: +46-(0)31-83 39 50
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