<font size="2"><p>AfaIk,<br>No err checking is avail on that level. I suggest go one or two levels up in osi and negotiate protocol (I assume you have picked one already?), eg: hello, wait for hello in return, sending xxx bytes, wait for go ahead in return... So on.<br><br>Herman<br></p></font><hr><font size="2"><p><b> From: </b>Fulko Hew [fulko.hew@gmail.com]<br><b> Sent: </b>03/15/2010 09:47 PM AST<br><b> To: </b>TPM <tpm@to.pm.org><br><b> Subject: </b>[tpm] how to detect ICMP 'port unreachable'?<br></p></font><br>
<br>Does anyone know what I can do to detect an unreachable UDP port?<br><br>The application uses UDP to talk to the remote system. Just a simple<br>send/receive pair. But if the 'other end's application isn't there, ie,<br>
no listener, then the remote host returns an ICMP message saying<br>the port is unreachable. Trouble is that I can't seem to see that<br>as an error response to either the send, or receive or select (looking<br>at the 'error' bit list).<br>
<br>BTW. I'm not allowed to send or receive any other messages,<br>only check the return values for the normal transactions, send(),<br>receive(), select(), or possibly check some status that might be<br>buried somewhere within the system.<br>
<br>Does anyone have any ideas?<br><br>Thanks<br>Fulko<br><br><br><br><br>
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