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struct addrinfo
{
int ai_flags;
int ai_family;
int ai_socktype;
int ai_protocol;
socklen_t ai_addrlen;
struct sockaddr *ai_addr;
char *ai_canonname;
struct addrinfo *ai_next;
};
extern int getaddrinfo(const char *name, const char *service, const struct addrinfo *req, struct addrinfo **pai);
extern void freeaddrinfo(struct addrinfo *ai);
extern int getnameinfo (struct sockaddr *sa, socklen_t salen, char *host, socklen_t hostlen, char *serv, socklen_t servlen, unsigned int flags);
const char *gai_strerror(int ecode);
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