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#include <stdio.h>
#include <sys/socket.h>
#include <netdb.h>
int main(int argc,char *argv[]) {
int i;
struct sockaddr sa;
int sl=sizeof(sa);
char host[256];
getpeername(0,&sa,&sl);
getnameinfo(&sa,sl,host,256,0,0,NI_NUMERICHOST);
puts(host);
}
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