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This patch is downstream patch, which makes CUPS to reload resolver, if /etc/resolv.conf is changed. This patch was introduced as solution of [1], but it has served only as a workaround for glibc issue [2] until it gets fixed. Please remove this patch when glibc solves its bug and it gets into RHEL.


[1] https://bugzilla.redhat.com/show_bug.cgi?id=1325692
[2] https://sourceware.org/bugzilla/show_bug.cgi?id=984

The issue is fixed in RHEL 8.