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a862771d1a
mptcp_connect.c is a startup tutorial of MPTCP programming, however there is a lack of ai_protocol(IPPROTO_MPTCP) usage. Add comment for getaddrinfo MPTCP support. This patch first uses IPPROTO_MPTCP to get addrinfo, and if glibc version is too old, it falls back to using IPPROTO_TCP. Co-developed-by: Geliang Tang <geliang@kernel.org> Signed-off-by: Geliang Tang <geliang@kernel.org> Signed-off-by: zhenwei pi <pizhenwei@bytedance.com> Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Link: https://patch.msgid.link/20250413-net-next-mptcp-sched-mib-sft-misc-v2-8-0f83a4350150@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>