From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris Friesen Subject: why are error messages suppressed if IP_RECVERR is not set? Date: Mon, 25 Aug 2003 11:08:43 -0400 Sender: netdev-bounce@oss.sgi.com Message-ID: <3F4A267B.1000405@nortelnetworks.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: To: Linux Kernel Mailing List , netdev@oss.sgi.com Errors-to: netdev-bounce@oss.sgi.com List-Id: netdev.vger.kernel.org I'm tracking down an issue where we are sending udp packets and they are being dropped (I suspect) in the device queue. In ip_build_xmit() we get the error code back saying that the packet was dropped, but unless IP_RECVERR is set, it seems that this error is hidden from userspace. I notice that the man page says that sendto will never give an errno of ENOBUFS, but if you turn on IP_RECVERR this is exactly what will happen. I guess I have two questions then: 1) why do we hide the fact that we've dropped the packet, and 2) why doesn't the man page talk about the IP_RECVERR option? I'm using 2.4.18, if it matters. Thanks, Chris -- Chris Friesen | MailStop: 043/33/F10 Nortel Networks | work: (613) 765-0557 3500 Carling Avenue | fax: (613) 765-2986 Nepean, ON K2H 8E9 Canada | email: cfriesen@nortelnetworks.com