[ECOS] Re: Question about TCP layer in RedBoot
Grant Edwards
grante@visi.com
Thu Oct 6 18:12:00 GMT 2005
I've sent the answer to your question to the list so that
others might also benefit from it.
http://www.catb.org/~esr/faqs/smart-questions.html#forum
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On Fri, Oct 07, 2005 at 01:47:34AM +0800, Hunag Sun I wrote:
> Firstly, thank you for replying. In TCP layer,there are no
> APIs,like bind(),accept(),socket(), these are necessary for
> "server" application.
Those are necessary for the BSD/Posix API. They are not
necessary for a server application as long as there is a way to
accomplish the same thing.
> I can't see any server application and these APIs in
> ./packages/redboot/current/src/net.
Look in net_io.c
In net_io_init() there's a call to __tcp_listen() to set up a
tcp socket listing on a port.
In net_io_test(), there's code that checks for new connections.
In _net_io_getc_nonblock() there's code that checks for rx data
and then calls __tcp_read().
In general look for __tcp_xxxx() functions.
> Could you tell how to find them out or any way possiable for
> my "server" implementation.
Here's a rough outline:
1) Declare a tcp_socket_t structure.
2) Call __tcp_listen() to attach that structure to a port.
3) Check the socket structure state field once in a while.
When it changes to _ESTABLISHED, you've got a connection.
4) Periodically check for rx data, if there is some, call
__tcp_read() to read data and then __tcp_write() to write
data.
5) When you're done, call __tcp_close()
6) Wait for the state to transition to _CLOSED.
7) If you want to accept a new connection, goto 2)
--
Grant Edwards
grante@visi.com
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