From: "Iñaki Baz Castillo" Date: 2010-01-05T00:49:04+09:00 Subject: Re: How to know the childs PID of a given process? El Lunes, 4 de Enero de 2010, Daniel Berger escribió: > On Jan 4, 7:21 am, Iñaki Baz Castillo wrote: > > El Lunes, 4 de Enero de 2010, Robert Klemme escribió: > > > On 01/04/2010 11:52 AM, Iñaki Baz Castillo wrote: > > > > Hi, I know that a Ruby process with PID 1000 (under Linux) has forked > > > > 4 times. How could I know the PID of those childs from any other ruby > > > > interpreter? This is, I just know the PID of the parent (1000). > > > > > > > > Of course I could do some hack as inspecting the output of "ps" and > > > > inspecting the pid/ppid, but I'd prfer a ppure Ruby method for this. > > > > > > > > Thanks for any suggestion. > > > > > > The typical approach is that the forking parent records PIDs of its > > > children. If that information needs to be propagated you can either > > > write it to a file or make it available via DRb. > > > > > > If you need multiple Ruby processes to collaborate I would probably > > > turn to DRb anyway. In that case you might not even need to record > > > PIDs but you could have a coordinator where processes register and > > > unregister or which starts processes itself. It depends on your use > > > case. > > > > Thanks a lot. The fact is that I'd like not to modify the program whose > > processes I want to monitor, so I was looking for something as "ps". > > http://github.com/djberg96/sys-proctable Really interesting, thanks a lot! -- Iñaki Baz Castillo