Re: [PATCH][BZ #14719] Return EAI_SYSTEM from getaddrinfo if we run out of fds

["Dmitry V. Levin" <ldv at altlinux dot org>]

On Mon, Apr 08, 2013 at 10:57:13AM +0530, Siddhesh Poyarekar wrote:
> On Mon, Apr 08, 2013 at 07:36:14AM +0400, Dmitry V. Levin wrote:
> > There is a slightly different case when it also shouldn't be EAI_SYSTEM:
> > 
> > $ strace -econnect,sendto ./t
> > ...
> > connect(3, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("192.0.43.10")}, 16) = 0
> > sendto(3, "\317I\1\0\0\1\0\0\0\0\0\0\7example\3net\0\0\1\0\1", 29, MSG_NOSIGNAL, NULL, 0) = -1 EPERM (Operation not permitted)
> > ...
> > System error: Resource temporarily unavailable
> > +++ exited with 1 +++
> > 
> > Such an environment could be constructed, e.g. by filtering outgoing
> > packets using iptables (-j REJECT --reject-with icmp-net-unreachable).
> > 
> 
> Have you tried this with the patch I posted[1] last week?  I get
> EAI_NONAME with my patch.

Yes, your patch passes the first (unshare -n) test: if connect fails with
ENETUNREACH, getaddrinfo returns EAI_NONAME with errno set to ECONNREFUSED.

But if sendto fails with EPERM, getaddrinfo returns EAI_SYSTEM with errno
set to EAGAIN.


-- 
ldv

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