《UNIX网络编程01》 第十一章 高级名字与地址转换 getaddrinfo

#include<unistd.h>
#include<netdb.h>
#include<sys/utsname.h>

int main()
{
struct addrinfo hints,*res;
bzero(&hints,sizeof(hints));

struct utsname Name;
uname(&Name);
int nRet = getaddrinfo(Name.nodename,"ftp",&hints,&res);

//int nRet = getaddrinfo("127.0.0.1","23",&hints,&res);
if(0 != nRet)
{
printf("error:%s\n",(char*)gai_strerror(nRet));
}
else
{
struct addrinfo *tmp = res;
for(; NULL != tmp; tmp=tmp->ai_next)
{
struct sockaddr_in *pAddr;
pAddr = (struct sockaddr_in *)tmp->ai_addr;
printf("port:%d\n",ntohs(pAddr->sin_port));

printf("ai_addrlen:%d\n",tmp->ai_addrlen);
printf("ai_canonname:%s\n",tmp->ai_canonname);
printf("ai_family:%d\n",tmp->ai_family);
printf("ai_flags:%d\n",tmp->ai_flags);
printf("ai_protocol:%d\n",tmp->ai_protocol);
printf("ai_socktype:%d\n\n",tmp->ai_socktype);
}

freeaddrinfo(res);
}

return 0;
}