#pragma once #include <_cheader.h> #include _Begin_C_Header extern int getnameinfo(const struct sockaddr *addr, socklen_t addrlen, char *host, socklen_t hostlen, char *serv, socklen_t servlen, int flags); extern int getaddrinfo(const char *node, const char *service, const struct addrinfo *hints, struct addrinfo **res); extern void freeaddrinfo(struct addrinfo *res); #define NI_NUMERICHOST 1 #define NI_MAXHOST 255 _End_C_Header