[ECOS] =?big5?q?=A6^=C2=D0:=20[ECOS]=20Re:=20Question=20about=20TCP=20layer=20in?==?big5?q?=20RedBoot?=

[Hunag Sun I <hsy04081 at yahoo dot com dot tw>]

Thanks for your sharing.

Sam

--- Grant Edwards <grante@visi.com> 弧

> 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
> 
> [Private support is available for a fee.]
> 
> 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
> 
> -- 
> Before posting, please read the FAQ:
> http://ecos.sourceware.org/fom/ecos
> and search the list archive:
> http://ecos.sourceware.org/ml/ecos-discuss
> 
> 


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