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net: socket: Define NI_MAXHOST for compatibility
Not in POSIX. Linux man getnameinfo says about it: "In order to assist the programmer in choosing reasonable sizes for the supplied buffers, <netdb.h> defines the constants #define NI_MAXHOST 1025 #define NI_MAXSERV 32 Since glibc 2.8, these definitions are exposed only if suitable feature test macros are defined, namely: _GNU_SOURCE, _DEFAULT_SOURCE (since glibc 2.19), or (in glibc versions up to and including 2.19) _BSD_SOURCE or _SVID_SOURCE." Signed-off-by: Paul Sokolovsky <email@example.com>
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