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   gai_strerror    ( 3 )

сетевой адрес и перевод услуг (network address and service translation)

Примечание (Note)

getaddrinfo() supports the address%scope-id notation for
       specifying the IPv6 scope-ID.


       AI_ADDRCONFIG, AI_ALL, and AI_V4MAPPED are available since glibc
       2.3.3.  AI_NUMERICSERV is available since glibc 2.3.4.


       According to POSIX.1, specifying hints as NULL should cause
       ai_flags to be assumed as 0.  The GNU C library instead assumes a
       value of (AI_V4MAPPED | AI_ADDRCONFIG) for this case, since this
       value is considered an improvement on the specification.