Linux에서 Socket 프로그래밍의 간단한 예

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#define SERVPORT 3333 
#define BACKLOG 10 
main()
{
 int sockfd,client_fd ,sin_size; 
struct sockaddr_in my_addr; 
struct sockaddr_in remote_addr; 
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) 
{
 perror("socket error"); exit(1);
 }
 my_addr.sin_family=AF_INET;
 my_addr.sin_port=htons(SERVPORT);
my_addr.sin_addr.s_addr = INADDR_ANY;
 bzero(&(my_addr.sin_zero),8);
 if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)) == -1) 
{
 perror("bind error");
 exit(1);
 }
 if (listen(sockfd, BACKLOG) == -1) 
{
 perror("listen error");
 exit(1);
 }
 while(1) {
 sin_size = sizeof(struct sockaddr_in);
 if ((client_fd = accept(sockfd, (struct sockaddr *)&remote_addr, &sin_size)) == -1) 
{
 perror("accept error");
 continue;
}
 printf("received a connection from %s
", inet_ntoa(remote_addr.sin_addr));
if (!fork()) 
{
time_t timep;
time (&timep);
char temp[100]="Hello,you are connected!the time now is:";
char * t=ctime(&timep);
strcat(temp,t);
 if (send(client_fd, temp, 100, 0) == -1)
 perror("send error");
close(client_fd);
exit(0);
}
 close(client_fd);
 }
 }

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#define SERVPORT 3333 
#define BACKLOG 10 
main()
{
 int sockfd,client_fd ,sin_size; 
struct sockaddr_in my_addr; 
struct sockaddr_in remote_addr; 
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) 
{
 perror("socket error"); exit(1);
 }
 my_addr.sin_family=AF_INET;
 my_addr.sin_port=htons(SERVPORT);
my_addr.sin_addr.s_addr = INADDR_ANY;
 bzero(&(my_addr.sin_zero),8);
 if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)) == -1) 
{
 perror("bind error");
 exit(1);
 }
 if (listen(sockfd, BACKLOG) == -1) 
{
 perror("listen error");
 exit(1);
 }
 while(1) {
 sin_size = sizeof(struct sockaddr_in);
 if ((client_fd = accept(sockfd, (struct sockaddr *)&remote_addr, &sin_size)) == -1) 
{
 perror("accept error");
 continue;
}
 printf("received a connection from %s
", inet_ntoa(remote_addr.sin_addr));
if (!fork()) 
{
time_t timep;
time (&timep);
char temp[1024]="\r
\r
 :";
char * t=ctime(&timep);
strcat(temp,t);
strcat(temp,"");
send(client_fd,"HTTP/1.1 200 OK\r
Server:HWS\r
Content-Length:1024\r
Content-Type:text/html;charset=utf-8\r
", 90, 0);
send(client_fd, temp, 1024, 0);

close(client_fd);

exit(0);
}
 close(client_fd);
 }
 }