Re: concept prove patch for ktrace output to all file types


On Thu, 28 Jun 2007, Howard Su wrote:

This is a concept prove patch for ktrace. In order to make ktrace write to stdout, /dev/xxx, fifo file, pipe, I changed ktrace syscall to accepting a file handler instead of a file name.

I just get a workable kernel patch. And i make as small as possible changes
to userland code. Now you can do something like:
#mkfifo foo
in session A: #kdump -f foo
in session B: #ktrace -f foo ls

Then, you can see a real time output like truss did.

Before moving forward (hacking userland), i want to get some feedback if my changes in kernel part is the right direction to do. Appreciate your time.

PS: The patch can be clearly apply to today's current.

What happens to processes associated with the same or other ktrace sessions if one ktrace session stalls due to a fifo or pipe buffer filling?

Robert N M Watson
Computer Laboratory
University of Cambridge
_______________________________________________
freebsd-current@xxxxxxxxxxx mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-current
To unsubscribe, send any mail to "freebsd-current-unsubscribe@xxxxxxxxxxx"