[lkml]   [2003]   [Aug]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Subjectwhy are error messages suppressed if IP_RECVERR is not set?

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.



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:

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:48    [W:0.056 / U:6.616 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site