[Bug network/5010] sunrpc service cleanup causes unwanted port mapper traffic

["cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=5010

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=37fb019cb02656d0ce0b8d40d56fe8c42f0d1658

commit 37fb019cb02656d0ce0b8d40d56fe8c42f0d1658
Author: Florian Weimer <fweimer@redhat.com>
Date:   Tue Feb 28 15:22:13 2017 +0100

    sunrpc: Do not unregister services if not registered [BZ #5010]

    The change in commit 718946816cf60374f9d8f674d3ed649fdb33205a
    has no effect because of two bugs which cancel each other out:
    The svc_is_mapped condition is inverted, and svc_is_mapped
    always returns false because the check is performed after
    the service has already been unregistered.  As a result,
    pmap_unset is called unconditionally, as before.

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

Summary of changes:
 ChangeLog                 |   12 ++
 sunrpc/Makefile           |    3 +
 sunrpc/svc.c              |   14 +--
 sunrpc/tst-svc_register.c |  299 +++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 316 insertions(+), 12 deletions(-)
 create mode 100644 sunrpc/tst-svc_register.c

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