Date: Sun, 13 Aug 2017 03:12:33 +0700 From: Eugene Grosbein <eugen@grosbein.net> To: Farhan Khan <khanzf@gmail.com>, freebsd-hackers@freebsd.org Subject: Re: Monitor kernel variable with ddb(4) Message-ID: <598F6131.3090002@grosbein.net> In-Reply-To: <CAFd4kYCrRgdhc76peh3-vGcS1CQ9RJUWAPJX5_hR7hMNkqiQeQ@mail.gmail.com> References: <CAFd4kYCrRgdhc76peh3-vGcS1CQ9RJUWAPJX5_hR7hMNkqiQeQ@mail.gmail.com>
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13.08.2017 2:42, Farhan Khan пишет: > Hi all, > > I am trying to figure out where a net80211's vap flags are modified. I see > that memory is originally allocated here: > http://src.illumos.org/source/xref/freebsd-head/sys/net/if.c#445. However, > I cannot figure out where the ifp->if_flags and if->if_drv_flags are ever > modified in the kernel. > > Someone suggested using ddb(4), so I entered the live debugger using sysctl > debug.kdb.enter=1 > > I then set a breakpoint at if_alloc. > > However, I cannot seem to figure out the next steps to monitor where the > ifp->if_flags or if->if_drv_flags are updated. > > Full explanation - My kernel module is immediately unloading, but I am not > certain why. I traced it back in the ieee80211 code to those flags, but not > sure where they are updated. > > Any ideas? Thank you! What driver do you use? There are lots of kernel level files that change ifp->if_flags and if->if_drv_flags: $ grep -lER '\<if(_drv)?_flags =' /usr/src/sys | wc -l 148 Perhaps, you need ieee80211_vap_setup() function in the /usr/src/sys/net80211/ieee80211.c or if_setdrvflagbits() in the /usr/src/sys/net/if.c or one of many driver source files in /usr/src/sys/dev
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