Re: Permission to task and proc

[Phil Muldoon <pmuldoon at redhat dot com>]

> In "Create a Frysk session" when FryskSessionDruid start up, all the 
> processes in "Available Process Groups" box are owned by the currenty user,
> and process owned by other users are not listed.  I read
> frysk-gui/frysk/gui/druid/CreateFryskSessionDruid.java, but still not
> know how these processes filtered.  Could anybody here clarify it for
> me?
>
>   
They basically use Proc.getUID() and Proc.getGID() and match it against 
the current users.

Those apis are just a reflection of the /proc/$$/status UID and GID.

I wrote this, but as I have to read status which has some supplemental 
information that stat does not, it was supposed to be a stop-gap 
measure. I don't know of a syscall to do the same thing. :(

It's demand only read too (ie the status file only gets read on 
getUID/getGID not on refresh, so one must be careful of that).

Regards

Phil