#include "unp.h" int main(int argc, char **argv) { int sockfd; struct sockaddr_in servaddr, cliaddr; sockfd = Socket(AF_INET, SOCK_DGRAM, 0); bzero(&servaddr, sizeof(servaddr)); servaddr.sin_family = AF_INET; servaddr.sin_addr.s_addr = htonl(INADDR_ANY); servaddr.sin_port = htons(SERV_PORT); Bind(sockfd, (SA *) &servaddr, sizeof(servaddr)); dg_echo(sockfd, (SA *) &cliaddr, sizeof(cliaddr)); }