1 #include <sys/types.h> /* predefined types */
2 #include <unistd.h> /* include unix standard library */
3 #include <arpa/inet.h> /* IP addresses conversion utilities */
4 #include <sys/socket.h> /* socket library */
5 #include <stdio.h> /* include standard I/O library */
9 int main(int argc, char *argv[])
12 * Variables definition
16 struct sockaddr_in serv_add;
21 if ( (list_fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
22 perror("Socket creation error");
25 /* initialize address */
26 memset((void *)&serv_add, 0, sizeof(serv_add)); /* clear server address */
27 serv_add.sin_family = AF_INET; /* address type is INET */
28 serv_add.sin_port = htons(13); /* daytime port is 13 */
29 serv_add.sin_addr.s_addr = htonl(INADDR_ANY); /* connect from anywhere */
31 if (bind(list_fd, (struct sockaddr *)&serv_add, sizeof(serv_add)) < 0) {
35 /* listen on socket */
36 if (listen(list_fd, BACKLOG) < 0 ) {
37 perror("listen error");
40 /* write daytime to client */
42 if ( (conn_fd = accept(list_fd, (struct sockaddr *) NULL, NULL)) <0 ) {
43 perror("accept error");
47 snprintf(buffer, sizeof(buffer), "%.24s\r\n", ctime(&timeval));
48 if ( (write(conn_fd, buffer, strlen(buffer))) < 0 ) {
49 perror("write error");