[Bug nscd/14906] inotify failed when /etc/hosts file change

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https://sourceware.org/bugzilla/show_bug.cgi?id=14906

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=cf9313e7d1dd42addd6cf8c9277f0f18a62cdeff

commit cf9313e7d1dd42addd6cf8c9277f0f18a62cdeff
Author: Carlos O'Donell <carlos@systemhalted.org>
Date:   Fri Mar 13 09:49:24 2015 -0400

    Enhance nscd's inotify support (Bug 14906).

    In bug 14906 the user complains that the inotify support in nscd
    is not sufficient when it comes to detecting changes in the
    configurationfiles that should be watched for the various databases.

    The current nscd implementation uses inotify to watch for changes in
    the configuration files, but adds watches only for IN_DELETE_SELF and
    IN_MODIFY. These watches are insufficient to cover even the most basic
    uses by a system administrator. For example using emacs or vim to edit
    a configuration file should trigger a reload but it might not if
    the editors use move to atomically update the file. This atomic update
    changes the inode and thus removes the notification on the file (as
    inotify is based on inodes). Thus the inotify support in nscd for
    configuration files is insufficient to account for the average use
    cases of system administrators and users.

    The inotify support is significantly enhanced and described here:
    https://www.sourceware.org/ml/libc-alpha/2015-02/msg00504.html

    Tested on x86_64 with and without inotify support.

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

Summary of changes:
 ChangeLog                  |   24 +++
 NEWS                       |   12 +-
 nscd/cache.c               |   28 +++-
 nscd/connections.c         |  358 ++++++++++++++++++++++++++++++++------------
 nscd/nscd.h                |   60 +++++++-
 nss/nss_db/db-init.c       |   28 +---
 nss/nss_files/files-init.c |   46 +++---
 7 files changed, 398 insertions(+), 158 deletions(-)

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