1 /* Subroutines declaration */
2 void ServEcho(int sockfd);
3 /* Program beginning */
4 int main(int argc, char *argv[])
8 struct sockaddr_in serv_add;
11 if ( (list_fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
12 perror("Socket creation error");
15 /* initialize address */
16 memset((void *)&serv_add, 0, sizeof(serv_add)); /* clear server address */
17 serv_add.sin_family = AF_INET; /* address type is INET */
18 serv_add.sin_port = htons(13); /* daytime port is 13 */
19 serv_add.sin_addr.s_addr = htonl(INADDR_ANY); /* connect from anywhere */
21 if (bind(list_fd, (struct sockaddr *)&serv_add, sizeof(serv_add)) < 0) {
25 /* listen on socket */
26 if (listen(list_fd, BACKLOG) < 0 ) {
27 perror("listen error");
30 /* handle echo to client */
32 /* accept connection */
33 if ( (conn_fd = accept(list_fd, NULL, NULL)) < 0) {
34 perror("accept error");
37 /* fork to handle connection */
38 if ( (pid = fork()) < 0 ){
42 if (pid == 0) { /* child */
43 close(list_fd); /* close listening socket */
44 SockEcho(conn_fd); /* handle echo */
47 close(conn_fd); /* close connected socket */
50 /* normal exit, never reached */