int main() {
int sockfd; int len;
struct sockaddr_in address; int result; char string[256]; char rcv[256];
/* Create a socket for the client. */
sockfd = socket(AF_INET, SOCK_STREAM, 0);
/* Name the socket, as agreed with the server. */
address.sin_family = AF_INET;
address.sin_addr.s_addr = inet_addr(\ address.sin_port = htons(9734); len = sizeof(address);
/* Now connect our socket to the server's socket. */
result = connect(sockfd, (struct sockaddr *)&address, len);
if(result == -1) {
perror(\ exit(1); }
/* We can now read/write via sockfd. */
printf(\ fgets(string,sizeof(string),stdin);
write(sockfd, string, sizeof(string)); read(sockfd, rcv, sizeof(rcv)); printf(\ close(sockfd); exit(0); }
//程序清单 8-2
/* Make the necessary includes and set up the variables. */
36
#include
int main() {
int server_sockfd, client_sockfd; int server_len, client_len; struct sockaddr_in server_address; struct sockaddr_in client_address; char string[256]; char *ans = \
/* Create an unnamed socket for the server. */
server_sockfd = socket(AF_INET, SOCK_STREAM, 0);
/* Name the socket. */
server_address.sin_family = AF_INET;
server_address.sin_addr.s_addr = inet_addr(\ server_address.sin_port = htons(9734); server_len = sizeof(server_address);
bind(server_sockfd, (struct sockaddr *)&server_address, server_len);
/* Create a connection queue and wait for clients. */
listen(server_sockfd, 5); while(1) { char ch;
printf(\
/* Accept a connection. */
client_len = sizeof(client_address); client_sockfd = accept(server_sockfd,
(struct sockaddr *)&client_address, &client_len);
printf(\
37
printf(\
= %u\\n\
/* We can now read/write to client on client_sockfd. */
read(client_sockfd, string, sizeof(string));
printf(\ write(client_sockfd, ans, sizeof(ans)); close(client_sockfd); }
close(server_sockfd); }
38