Linux Programming

<pre>


Could some kind person help me to analyze this code ?

It is a modification of 

http://people.csail.mit.edu/albert/bluez-intro/


I have few basic concerns 
1. I am not sure  how "client" server gels included in the FULL  implementation.
The resource , and many "free source code " copies of it do not include the actual
FULL implementations. 

2. I am not sure How EACH USAGE OF "so9cket"  interacts.

3,  My code sort of works until 

  //client = accept(server_socket, (struct sockaddr *)&rem_addr, &opt);

When the above code is uncommented  the code execution  (in debug mode ) STOPS  at that line. 

I have no reasonable  description of the ""accept" function and  NOT KNOW how to debug / step thru it – it is  "bluez ?"  library code. 

'I am not sure if "server_socket" belongs to this function...

Part of code :


    //HERE
    // temporary initialize client to fail code 
    client = -1;
    // select SPC_CA
    //rem_addr  = "01:23:45:67:89:AB"; // ,SPP_C_addr[19];
    // accept one connection
    // verify passed paramaters ??
    text = "verify  server_socket ";
    text += QString ::number(server_socket);
    text += Q_FUNC_INFO;
    text += " @ line ";
    text += QString::number(__LINE__);
    qDebug() << text;
#ifdef BYPASS
    text = " (struct sockaddr *)&rem_addr ";
    //text += QString ::number(server_socket);
    //text += rem_addr.rc_bdaddr.toString();
    text += Q_FUNC_INFO;
    text += " @ line ";
    text += QString::number(__LINE__);
    qDebug() << text;
#endif

    //client = accept(server_socket, (struct sockaddr *)&rem_addr, &opt);




    text = "verify  server_socket ";
    text += QString ::number(server_socket);
    text += Q_FUNC_INFO;
    text += " @ line ";
    text += QString::number(__LINE__);
    qDebug() << text;



    if(client < 0 )
    {
//#ifdef C_CODE_TRACE
   text = " FAILED accept one connection";
   text += Q_FUNC_INFO;
   text += " @ line ";
   text += QString::number(__LINE__);
   text += " client  ";
   text += QString::number(client );


   qDebug() << text;

//#endif


    }
    else
    {
#ifdef C_CODE_TRACE
   text = "SUCCESS  accept one connection";
   text += Q_FUNC_INFO;
   text += " @ line ";
   text += QString::number(__LINE__);
   text += " client  ";
   text += QString::number(client );

   qDebug() << text;
#endif

    }





    ba2str( &rem_addr.rc_bdaddr, buf );
    fprintf(stderr, "Verify accepted rem address connection from %s\n", buf);



    memset(buf, 0, sizeof(buf));
    // read data from the client
    bytes_read = read(client, buf, sizeof(buf));
    if( bytes_read > 0 ) {
    printf("received [%s]\n", buf);
    }
    else
    {
#ifdef C_CODE_TRACE
   text = "NO DATA received -  accept one connection";
   text += Q_FUNC_INFO;
   text += " @ line ";
   text += QString::number(__LINE__);
   qDebug() << text;
#endif
    }


    // close connection
    // close(client);
   return 0;


Here is my partial  debug output 




"hci_read_remote_name   SPP-CA"
"hci_read_remote_name  address   98:D3:31:F8:39:33"
"Success contains / found SPP-CA    98:D3:31:F8:39:33"
"Success contains / found SPP-CA    98:D3:31:F8:39:33"
"temporary return    "
"int MainWindow_C_CODE_FORM::C_CODE_server() @ line 68"
"OK allocated server socket 27int MainWindow_C_CODE_FORM::C_CODE_server() @ line 90"
"int MainWindow_C_CODE_FORM::C_CODE_server() @ line 97"
"SUCCESS bound to server int MainWindow_C_CODE_FORM::C_CODE_server() @ line 137"
"SUCCESS listen_mode int MainWindow_C_CODE_FORM::C_CODE_server() @ line 161"
"verify  server_socket 27int MainWindow_C_CODE_FORM::C_CODE_server() @ line 176"
"verify  server_socket 27int MainWindow_C_CODE_FORM::C_CODE_server() @ line 197"
" FAILED accept one connectionint MainWindow_C_CODE_FORM::C_CODE_server() @ line 208 client  -1"
Verify accepted rem address connection from 98:D3:31:F8:39:33
"NO DATA received -  accept one connectionint MainWindow_C_CODE_FORM::C_CODE_server() @ line 255"
"SUCCESS  server activated   "


Thanks 

sudo setcap CAP_NET_ADMIN=eip /path/to/your/executable

CAP_NET_ADMIN=eip

user@localhost:~# read -ep "command: " cmd ; "$cmd"

command: id ; date
-bash: id ; date : command not found