[Bug nscd/16639] systemctl start nscd.service should return non-zero status on failure

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https://sourceware.org/bugzilla/show_bug.cgi?id=16639

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=532a60357ef4c5852cc1bf836cfd9d6f093ef204

commit 532a60357ef4c5852cc1bf836cfd9d6f093ef204
Author: Siddhesh Poyarekar <siddhesh@redhat.com>
Date:   Mon Mar 3 22:51:39 2014 +0530

    nscd: Improved support for tracking startup failure in nscd service (BZ
#16639)

    Currently, the nscd parent process parses commandline options and
    configuration, forks on startup and immediately exits with a success.
    If the child process encounters some error after this, it goes
    undetected and any services started up after it may have to repeatedly
    check to make sure that the nscd service did actually start up and is
    serving requests.

    To make this process more reliable, I have added a pipe between the
    parent and child process, through which the child process sends a
    notification to the parent informing it of its status.  The parent
    waits for this status and once it receives it, exits with the
    corresponding exit code.  So if the child service sends a success
    status (0), the parent exits with a success status.  Similarly for
    error conditions, the child sends the non-zero status code, which the
    parent passes on as the exit code.

    This, along with setting the nscd service type to forking in its
    systemd configuration file, allows systemd to be certain that the nscd
    service is ready and is accepting connections.

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

Summary of changes:
 ChangeLog          |   22 +++++++++++
 nscd/connections.c |   48 ++++++++++++-----------
 nscd/nscd.c        |  108 +++++++++++++++++++++++++++++++++++++++++++++++++--
 nscd/nscd.h        |    2 +
 nscd/selinux.c     |   18 ++++----
 5 files changed, 161 insertions(+), 37 deletions(-)

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