# include < stdio. h>
# include < string . h>
# include < sys/ socket . h>
# include < netinet/ in. h>
# define MAXDATASIZE 1024
# define SERVERPORT 8000
# define MAXCONN_NUM 10
int main( )
{
char buf[ MAXDATASIZE] ;
int sockfd, new_fd, numbytes;
struct sockaddr_in server_addr;
struct sockaddr_in client_addr;
int sin_size;
if ( ( sockfd = socket ( AF_INET , SOCK_STREAM , 0) ) = = - 1) {
perror ( "socket error" ) ;
return 1;
}
memset ( & client_addr, 0, sizeof ( struct sockaddr ) ) ;
server_addr. sin_family = AF_INET ;
server_addr. sin_port = htons ( SERVERPORT) ;
server_addr. sin_addr. s_addr = INADDR_ANY ;
if ( bind ( sockfd, ( struct sockaddr * ) & server_addr, sizeof ( struct sockaddr ) ) = = - 1) {
perror ( "bind error" ) ;
return 1;
}
if ( listen ( sockfd, MAXCONN_NUM) = = - 1) {
perror ( "listen error" ) ;
return 1;
}
while ( 1) {
sin_size = sizeof ( struct sockaddr_in ) ;
if ( ( new_fd = accept ( sockfd, ( struct sockaddr * ) & client_addr, & sin_size) ) = = - 1) {
perror ( "accept error" ) ;
continue ;
}
printf ( "server: got connection from %s/n" , inet_ntoa( client_addr. sin_addr) ) ;
if ( ( numbytes = recv ( new_fd, buf, MAXDATASIZE, 0) ) = = - 1) {
perror ( "recv error" ) ;
return 1;
}
if ( numbytes) {
buf[ numbytes] = '/0' ;
printf ( "received: %s/n" , buf) ;
sleep ( 3) ;
}
printf ( "send: hi~~/n" ) ;
if ( send ( new_fd, "hi~~" , 5, 0) = = - 1) {
perror ( "send error" ) ;
return 1;
}
close ( new_fd) ;
}
return 0;
}