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Fixes a segfault in nscd when using nss-myhostname.
Nscd expects that an NSS module's gethostbyname4_r function returns
its first result in the pre-allocated gaih_addrtuple denoted by **pat.
(See nscd/aicache.c in the Glibc sources.) However, nss-myhostname
doesn't fill in **pat but allocates the first result in ‘buffer’, then
sets *pat. So nscd crashes (e.g. when running ‘getent ahosts
my-machine’).
Hard to tell if this is a bug in nscd, since there doesn't seem to be
a proper API spec for gethostbyname4_r. But in any case, this patch
fixes the crash by copying the first result to **pat.
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Converted from html to xml and changed the style to fit into the other
manpages.
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Note that there are still some rome for cleanups. In particular,
the .la files are now installed, which we probably don't want; and
some of the macros in Makefile.am are likely redundan.
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Also update the licence in the source files.
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In order to merge into the systemd repos.
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