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getaddrinfo.3: Explain one use case for AI_ADDRCONFIG
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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@ -385,6 +385,13 @@ IPv4 address configured, and IPv6 addresses are returned
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only if the local system has at least one IPv6 address configured.
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The loopback address is not considered for this case as valid
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as a configured address.
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This flag is useful on, for example,
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IPv4-only systems, to ensure that
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.BR getaddrinfo ()
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does not return IPv6 socket addresses that would always fail in
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.BR connect (2)
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or
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.BR bind (2).
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.PP
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If
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.I hints.ai_flags
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