Date: Mon, 9 Apr 2007 10:35:08 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Garrett Cooper <youshi10@u.washington.edu> Cc: freebsd-hackers@freebsd.org Subject: Re: Discovering list of open files from "kernel level" without using utils like lsof Message-ID: <20070409152956.GB93087@dan.emsphone.com> In-Reply-To: <46192EFC.6030906@u.washington.edu> References: <46192EFC.6030906@u.washington.edu>
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In the last episode (Apr 08), Garrett Cooper said: > I'm trying to see whether it's possible to grab the list of > files open from a kernel level on FreeBSD, using a userland library > interface as opposed to lsof. > I'm trying to see if there's a simple tool that I could code in > C/C++ if necessary to spin down disks automatically to save power and > disk life. Plus, I think that lsof actually would probe the devices > and 'wake them up' instead of keeping them as-is. However, I could be > wrong so if I am please let me know. Take a look at how /usr/bin/fstat does it. There is apparently a "kern.file" sysctl that holds the open file table, but fstat digs through kernel memory. -- Dan Nelson dnelson@allantgroup.com
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