RE: Sock_recvmsg() blocks and is not killable

["Jitesh Shah" <jitesh.shah@xxxxxxxxxx>]

Adil,

 

Thanks for your response. The problem is not what you might be thinking. The problem is that the recv function is itself blocked till a valid packet is received. The recv function doesnt exit until a valid packet is received. The condition when a packet of size less than equal zero byte is received simply doesnt occur.

 

I dunno if it helps to add that I am using linux kernel 2.4.19.

 

Regards

 

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From: Adil Mujeeb [mailto:mujeeb.adil@xxxxxxxxx]
Sent: Thursday, January 26, 2006 9:47 AM
To: Jitesh Shah
Cc: kernelnewbies@xxxxxxxxxxxx
Subject: Re: Sock_recvmsg() blocks and is not killable

Replace the following code

        while(len <= 0)
        {
              len = recv(g_socket, data_buff, rx_buff_size, 0);
        }
       
        if(get_pending_signal(current))
        {
            break;
        }

like this :     
        while(len <= 0)
        {
              len = recv(g_socket, data_buff, rx_buff_size, 0);
          /* check signal here*/
          if(get_pending_signal(current))
             {
             signal_flag = 1; /*add a flag for signal, to keep ur logic */
                  break;
             }
        }
       
        if(signal_flag)
        {
            break;
        }

Hope it will work
Rgds,
Adil