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

[Dmitry V. Levin]

Hi,

On Tue, Oct 23, 2012 at 05:18:35PM +0530, Siddhesh Poyarekar wrote:
> 
> As described in the bug report, the current behaviour for getaddrinfo
> when it runs out of file descriptors is to return EAI_NOTFOUND, which
> is incorrect.  Since a system error has occurred, it should be
> returning EAI_SYSTEM so that the real cause of the failure could be
> seen from errno.  Attached patch does that.  Tested on x86_64 Fedora
> 16 for AF_INET, AF_UNSPEC and AF_INET6.  OK to commit?
> 
> Regards,
> Siddhesh
> 
> ChangeLog:
> 
> 	[BZ #14719]
> 	* nss/getXXbyYY_r.c (INTERNAL (REENTRANT_NAME)): Set h_errno to
> 	NETDB_INTERNAL when NSS_STATUS_UNAVAIL.
> 	* resolv/nss_dns/dns-host.c (_nss_dns_gethostbyname3_r): Set
> 	h_errno to NETDB_INTERNAL when errno is EMFILE or ENFILE.
> 	(_nss_dns_gethostbyname4_r): Likewise.
> 	* sysdeps/posix/getaddrinfo.c (gaih_inet): Set result to
> 	EAI_SYSTEM if NSS_STATUS_UNAVAIL.

As a side effect of this change, ECONNREFUSED results to EAI_SYSTEM
instead of EAI_AGAIN.  Caught by gnulib's test-getaddrinfo which now fails
when no network is available:
http://git.savannah.gnu.org/cgit/gnulib.git/tree/tests/test-getaddrinfo.c
Other apps may rely on getaddrinfo returning EAI_AGAIN in case of
ECONNREFUSED, so this is a regression.


-- 
ldv
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