linux-kernel - Re: udev missing events?

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Message-ID: <y0mr4v9mg16.fsf@fche.csb>
Date:	Fri, 27 Apr 2012 09:59:49 -0400
From:	fche@...hat.com (Frank Ch. Eigler)
To:	Jim Paris <jim@...n.com>
Cc:	linux-hotplug@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Milan Broz <mbroz@...hat.com>
Subject: Re: udev missing events?


Jim Paris <jim@...n.com> writes:

> [...]
> To try to track it further, I wrote a systemtap script (available at
> http://jim.sh/~jim/tmp/monitor.stp).  It dumps the result of
> netlink_broadcast_filtered at lib/kobject_uevent.c:248 [...]

By the way, your monitor.stp contains this bit:

   /* I don't know how to do this better, indexing envp
   if ($env->envp_idx > 0) printf("  %s\n", $env->envp[0]$)
   if ($env->envp_idx > 1) printf("  %s\n", $env->envp[1]$)
   [...]
   if ($env->envp_idx > 9) printf("  %s\n", $env->envp[9]$)
   if ($env->envp_idx > 10) printf("..... more\n")

More idiomatic would be as follows (stap version 0.9.9+):

   for (i=0; i<$env->envp_idx; i++) {
       printf("  %s\n", $env->envp[i]$)
   }

- FChE
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