+++ /dev/null
-#include <sys/types.h> /* predefined types */
-#include <unistd.h> /* include unix standard library */
-#include <arpa/inet.h> /* IP addresses conversion utilities */
-#include <sys/socket.h> /* socket library */
-#include <stdio.h> /* include standard I/O library */
-
-int main(int argc, char *argv[])
-{
- int sock_fd;
- int i, nread;
- struct sockaddr_in serv_add;
- char buffer[MAXLINE];
- ...
- /* create socket */
- if ( (sock_fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
- perror("Socket creation error");
- return -1;
- }
- /* initialize address */
- memset((void *) &serv_add, 0, sizeof(serv_add)); /* clear server address */
- serv_add.sin_family = AF_INET; /* address type is INET */
- serv_add.sin_port = htons(13); /* daytime post is 13 */
- /* build address using inet_pton */
- if ( (inet_pton(AF_INET, argv[optind], &serv_add.sin_addr)) <= 0) {
- perror("Address creation error");
- return -1;
- }
- /* extablish connection */
- if (connect(sock_fd, (struct sockaddr *)&serv_add, sizeof(serv_add)) < 0) {
- perror("Connection error");
- return -1;
- }
- /* read daytime from server */
- while ( (nread = read(sock_fd, buffer, MAXLINE)) > 0) {
- buffer[nread]=0;
- if (fputs(buffer, stdout) == EOF) { /* write daytime */
- perror("fputs error");
- return -1;
- }
- }
- /* error on read */
- if (nread < 0) {
- perror("Read error");
- return -1;
- }
- /* normal exit */
- return 0;
-}