[omniORB] Need to know about omniORBs file descriptor allocation

[Sai-Lai Lo]

Jan Lessner <jan@c-lab.de> writes:

> For savely spawning processes from an omniORB server on Solaris, I need
> information over omniORB's file descriptor allocation (the fds must
> explicitely be closed before exec). In omniORB 2.2 I added an
> appropriate callback function for that ,informing me about allocation
> and deallocation of fds in strand_server::run and
> tcpsock_rendezvouser::run. But since many things concerning connection
> management have changed in omniORB 2.5, I'm afraid I need a hint where
> to put callbacks like that now. I don't find the old functions any more
> and I'm lost in the source code. It will take me ages to find out by
> myself, so I'd appriciate a little help from anyone who is familiar with
> this issue.
> 

Jan,

Instead of adding callback functions, I suggest you export a fd_set, in
omniORB namespace perhaps, to let your application determine what file
descriptors are in use at the moment.

Something like this:

class omniORB {
public:

   static fd_set fds;  // choose a better name
};


In tcpSocketMTfactory.cc:

fd_set omniORB::fds;          // Initialise this with FD_ZERO(&omniORB::fds);
                              // in ORB_init().
static omni_mutex fds_lock;

And redefine CLOSESOCKET:

#define CLOSESOCKET(sock)  do { omni_mutex_lock sync(fds_lock); \
                                FD_CLR(sock,&omniORB::fds); \
                              } while(0)


And define a new macro:

#define REGISTERSOCKET(sock) do { omni_mutex_lock sync(fds_lock); \
                                  FD_SET(sock,&omniORB::fds); \
                                } while(0)

And add a call to REGISTERSOCKET(sock) after the calls to socket() returns
with a valid socket, there is only 3 calls to socket() in
tcpSocketMTfactory.cc.


After your apps fork, just test for FD_ISSET() in omniORB::fds.

That is all you need to do I think.

Sai-Lai



-- 
Dr. Sai-Lai Lo                          |       Research Scientist
                                        |
E-mail:         S.Lo@orl.co.uk          |       Olivetti & Oracle Research Lab
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