On Wed, Oct 22, 2014 at 06:50:37AM -0600, Alan Robertson wrote: > On 10/22/2014 03:33 AM, Dejan Muhamedagic wrote: > > Hi Alan, > > > > On Mon, Oct 20, 2014 at 02:52:13PM -0600, Alan Robertson wrote: > >> For the Assimilation code I use the full pathname of the binary from > >> /proc to tell if it's "one of mine". That's not perfect if you're using > >> an interpreted language. It works quite well for compiled languages. > > Yes, though not perfect, that may be good enough. I supposed that > > the probability that the very same program gets the same recycled > > pid is rather low. (Or is it?) > From my 'C' code I could touch the lock file to match the timestamp of > the /proc/pid/stat (or /proc/pid/exe) symlink -- and verify that they > match. If there is no /proc/pid/stat, then you won't get that extra > safeguard. But as you suggest, it decreases the probability by orders > of magnitude even without the > > The /proc/pid/exe symlink appears to have the same timestamp as > /proc/pid/stat
Hmm, not here: $ sudo ls -lt /proc/1 ... lrwxrwxrwx 1 root root 0 Aug 27 13:51 exe -> /sbin/init dr-x------ 2 root root 0 Aug 27 13:51 fd -r--r--r-- 1 root root 0 Aug 27 13:20 cmdline -r--r--r-- 1 root root 0 Aug 27 13:18 stat And the process (init) has been running since July: $ ps auxw | grep -w [i]nit root 1 0.0 0.0 10540 780 ? Ss Jul07 1:03 init [3] Interesting. > Does anyone know which OSes have either or both of those /proc names? Nope, not me. Cheers, Dejan > -- AlanRobertson > al...@unix.sh > > > _______________________________________________________ > Linux-HA-Dev: Linux-HA-Dev@lists.linux-ha.org > http://lists.linux-ha.org/mailman/listinfo/linux-ha-dev > Home Page: http://linux-ha.org/ _______________________________________________________ Linux-HA-Dev: Linux-HA-Dev@lists.linux-ha.org http://lists.linux-ha.org/mailman/listinfo/linux-ha-dev Home Page: http://linux-ha.org/
