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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" "Socket::GetAddrInfo::Emul" \- Pure Perl emulation of "getaddrinfo" and "getnameinfo" using IPv4\-only legacy resolvers .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\f(CW\*(C`Socket::GetAddrInfo\*(C'\fR attempts to provide the \f(CW\*(C`getaddrinfo\*(C'\fR and \&\f(CW\*(C`getnameinfo\*(C'\fR functions by some \s-1XS\s0 code that calls the real functions in \&\fIlibc\fR. If for some reason this cannot be done; either there is no C compiler, or \fIlibc\fR does not provide these functions, then they will be emulated using the legacy resolvers \f(CW\*(C`gethostbyname\*(C'\fR, etc... These emulations are not a complete replacement of the real functions, because they only support IPv4 (the \f(CW\*(C`AF_INET\*(C'\fR socket family). In this case, the following restrictions will apply. .SS "getaddrinfo" .IX Subsection "getaddrinfo" .IP "\(bu" 4 If the \f(CW\*(C`family\*(C'\fR hint is supplied, it must be \f(CW\*(C`AF_INET\*(C'\fR. Any other value will result in an error thrown by \f(CW\*(C`croak\*(C'\fR. .IP "\(bu" 4 The only supported \f(CW\*(C`flags\*(C'\fR hint values are \f(CW\*(C`AI_PASSIVE\*(C'\fR, \f(CW\*(C`AI_CANONNAME\*(C'\fR, \&\f(CW\*(C`AI_NUMERICSERV\*(C'\fR and \f(CW\*(C`AI_NUMERICHOST\*(C'\fR. .Sp The flags \f(CW\*(C`AI_V4MAPPED\*(C'\fR and \f(CW\*(C`AI_ALL\*(C'\fR are recognised but ignored, as they do not apply to \f(CW\*(C`AF_INET\*(C'\fR lookups. Since this function only returns \f(CW\*(C`AF_INET\*(C'\fR addresses, it does not need to probe the system for configured addresses in other families, so the \f(CW\*(C`AI_ADDRCONFIG\*(C'\fR flag is also ignored. .Sp Note that \f(CW\*(C`AI_NUMERICSERV\*(C'\fR is an extension not defined by \s-1RFC 2553,\s0 but is provided by most OSes. It is possible (though unlikely) that even the native \&\s-1XS\s0 implementation does not recognise this constant. .SS "getnameinfo" .IX Subsection "getnameinfo" .IP "\(bu" 4 If the sockaddr family of \f(CW$addr\fR is anything other than \f(CW\*(C`AF_INET\*(C'\fR, an error will be thrown with \f(CW\*(C`croak\*(C'\fR. .IP "\(bu" 4 The only supported \f(CW$flags\fR values are \f(CW\*(C`NI_NUMERICHOST\*(C'\fR, \f(CW\*(C`NI_NUMERICSERV\*(C'\fR, \&\f(CW\*(C`NI_NOFQDN\*(C'\fR, \f(CW\*(C`NI_NAMEREQD\*(C'\fR and \f(CW\*(C`NI_DGRAM\*(C'\fR. .SH "IDN SUPPORT" .IX Header "IDN SUPPORT" This pure-perl emulation provides the \s-1IDN\s0 constants such as \f(CW\*(C`AI_IDN\*(C'\fR and \&\f(CW\*(C`NI_IDN\*(C'\fR, but the \f(CW\*(C`getaddrinfo\*(C'\fR and \f(CW\*(C`getnameinfo\*(C'\fR functions will croak if passed these flags. This should allow a program to probe for their support, and fall back to some other behaviour instead. .SH "AUTHOR" .IX Header "AUTHOR" Paul Evans