Data streaming / sharing from client side in an IPC example

[Martin Schröder]

Hi,

Am 27.01.2014 15:03, schrieb Ajith Whowe:
> Dear all,
>
> I have reviewed available examples for the client server based 
> applications. Unfortunately could not find any example for which a 
> client sends a char array to the server side. Each time the client 
> sends a request and the server shares the data. Would it be possible 
> to find an example for that?
>
> For instance in the streammap example, the clients does the following 
> (writes basic protocal and message tag to the UTCB and waits for the 
> stream from the server would it be possible for the client to perform 
> the stream whereas the server waits for the input?:
>
> s << l4_umword_t 
> <http://os.inf.tu-dresden.de/L4Re/doc/group__l4__basic__types.html#ga1c2c4b333f75b1d05b59855910f2b9cb>(Opcode::Do_map)
> << (l4_addr_t 
> <http://os.inf.tu-dresden.de/L4Re/doc/group__l4__basic__types.html#ga4087b991c40c0d2fcde9ca331049a4d4>)addr;
Just insert the following line here:

             s << "message from client";

> s << L4::Ipc::Rcv_fpage::mem((l4_addr_t 
> <http://os.inf.tu-dresden.de/L4Re/doc/group__l4__basic__types.html#ga4087b991c40c0d2fcde9ca331049a4d4>)addr, 
> L4_PAGESHIFT 
> <http://os.inf.tu-dresden.de/L4Re/doc/group__l4__memory__api.html#gad2f7e71d6265b2735f730dc90c54539a>, 
> 0);
>
> The server on the other hand gets the protocol and base adress and 
> then does the streaming:
> l4_addr_t 
> <http://os.inf.tu-dresden.de/L4Re/doc/group__l4__basic__types.html#ga4087b991c40c0d2fcde9ca331049a4d4> 
> snd_base;
> ios >> snd_base;
and insert here:

             unsigned long len;
             char buf[100];
             len = sizeof(buf);
             ios >> L4::Ipc::Buf_cp_in<char>(buf, len);
             buf[len]='\0';
             printf ("Received from client: %s\n", buf);

> // put something into the page to read it out at the other side
> snprintf(page_to_map, sizeof(page_to_map), "Hello from the server!");
> printf("Sending to client\n");
> // send page
> ios << L4::Ipc::Snd_fpage::mem((l4_addr_t 
> <http://os.inf.tu-dresden.de/L4Re/doc/group__l4__basic__types.html#ga4087b991c40c0d2fcde9ca331049a4d4>)page_to_map, 
> L4_PAGESHIFT 
> <http://os.inf.tu-dresden.de/L4Re/doc/group__l4__memory__api.html#gad2f7e71d6265b2735f730dc90c54539a>,
> L4_FPAGE_RO 
> <http://os.inf.tu-dresden.de/L4Re/doc/group__l4__fpage__api.html#gga5d4f4972d58f72b2a33b6c139b5950a8a555326b01b4fe72916157bdc90307691>, 
> snd_base)
>
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