Queryable Daemon

[MRAB]

Justin DeCell wrote:
> Hi All,
> 
> I was hoping for a little help with a project I'm working on. I'm 
> writing a daemon in python that I want to be queryable  (i.e. I should 
> be able to run foo -s and it will report some internal information about 
> the foo daemon if it's running) but I can't figure out a way get 
> information from that process from an external process. I was thinking 
> that there should be a way to open a file descriptor, have the daemon 
> write to that every so often and then have the query process just read 
> from that fd but it looks like on the process reading from an fd has to 
> be a child of the daemon for this to work. The only other way I thought 
> of would be to write to a file on disk every so often from the daemon 
> and just read the from the query process but it seems like there should 
> be a more elegant way to do this...
> 
> By the way I'm writing this for unix only so there's no need to worry 
> about compatibility with other os'.
> 
Instead of a file descriptor, how about a socket? A certain port at
"127.0.0.1"?