The only reason I'm using pipes in the first place is because dnspython isn't thread safe. Otherwise I would be using threads and wouldn't have this problem. I don't know of another way to fork a process and have the child return a value. Plus there is up to 1000 pipes open at once. -Josh On Fri, 23 Jul 2004 09:13:31 -0500, David Phillips <david at acz.org> wrote: > Thomas T. Veldhouse writes: > > Why is that? It is much easier to differentiate between senders if > > you use sockets rather than pipes. There are other types than > > TCP sockets that would work in thiis case (i.e. Unix sockets). > > Sockets can be created via socket() or socketpair(). The latter provides no > way to differentiate between senders. Using sockets, the two most portable > methods are Unix domain sockets and internet sockets. > > Unix domain sockets require a name to be created on the filesystem. The OP > stated that he did not want to use a temporary file, so it is likely he did > not want to use the filesystem at all. This might be due to permission > issues, name conflicts (multiple instances of the program), etc. > > Internet sockets require binding to an IP address and port. Choosing a > unique port number could be problematic if there are multiple instances of > the program. Each child would need to be identified either by the IPC > protocol or via the port it is connecting from. The latter requires > connecting the sockets before forking and closing all the extra descriptors. > > If you simply want to differentiate by using extra file descriptors, then > using multiple pipes or socket pairs would be easiest. Care must be taken > to close extra file descriptors in each child. > > > > -- > David Phillips <david at acz.org> > http://david.acz.org/ > > _______________________________________________ > TCLUG Mailing List - Minneapolis/St. Paul, Minnesota > Help beta test TCLUG's potential new home: http://plone.mn-linux.org > Got pictures for TCLUG? Beta test http://plone.mn-linux.org/gallery > tclug-list at mn-linux.org > https://mailman.real-time.com/mailman/listinfo/tclug-list > _______________________________________________ TCLUG Mailing List - Minneapolis/St. Paul, Minnesota Help beta test TCLUG's potential new home: http://plone.mn-linux.org Got pictures for TCLUG? Beta test http://plone.mn-linux.org/gallery tclug-list at mn-linux.org https://mailman.real-time.com/mailman/listinfo/tclug-list