Re: 2.6.7-rc2-mm2 udp multicast problem (sendto hangs)

[Denis Vlasenko]

On Wednesday 23 June 2004 12:56, Martin Zwickel wrote:
> if I use MSG_DONTWAIT with sendto, I get temporarily unavailable resources
> (many!):
>
> sendto(sendfd): Resource temporarily unavailable
>
> but isn't udp supposed to not block?

Think about what will happen if you will try to spew
udp packets continuously:

while(1)
	sendto(...);

They will pile up in queue and eventually it will fill up.
Then kernel may either drop excess packets silently
or return you EAGAIN.
-- 
vda
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