[Bug nss/21915] nss_files can return with NSS_STATUS_SUCCESS and a clobbered errno value, causing getaddrinfo to fail

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https://sourceware.org/bugzilla/show_bug.cgi?id=21915

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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=f4a6be2582b8dfe8adfa68da3dd8decf566b3983

commit f4a6be2582b8dfe8adfa68da3dd8decf566b3983
Author: Florian Weimer <fweimer@redhat.com>
Date:   Fri Sep 1 09:34:29 2017 +0200

    getaddrinfo: Fix error handling in gethosts [BZ #21915] [BZ #21922]

    The old code uses errno as the primary indicator for success or
    failure.  This is wrong because errno is only set for specific
    combinations of the status return value and the h_errno variable.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                        |   14 +++++
 nss/Makefile                     |    7 +++
 nss/tst-nss-files-hosts-erange.c |  109 ++++++++++++++++++++++++++++++++++++++
 resolv/tst-resolv-basic.c        |   78 +++++++++++++++++++--------
 sysdeps/posix/getaddrinfo.c      |   42 +++++++--------
 5 files changed, 205 insertions(+), 45 deletions(-)
 create mode 100644 nss/tst-nss-files-hosts-erange.c

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