#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <sys/select.h>
void error_handling(char *message);
int main(int argc, char *argv[])
{
int serv_sock;
int clnt_sock;
struct sockaddr_in serv_addr;
struct sockaddr_in clnt_addr;
socklen_t clnt_addr_size;
fd_set rfd;
char message[] = "Hello Master HaKu!";
if (argc != 2)
{
printf("Usage: %s <port>\n", argv[0]);
exit(1);
}
serv_sock = socket(AF_INET, SOCK_STREAM, 0);
if (serv_sock == -1)
error_handling("sock() error");
memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
serv_addr.sin_port = htons(atoi(argv[1]));
if (bind(serv_sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr)) == -1)
error_handling("bind() error");
if (listen(serv_sock, 5) == -1)
error_handling("listen() error");
clnt_addr_size = sizeof(clnt_addr);
clnt_sock = accept(serv_sock, (struct sockaddr*)&clnt_addr, &clnt_addr_size);
if (clnt_sock == -1)
error_handling("accept() error");
write(clnt_sock, message, sizeof(message));
char readbuff[100];
char sendbuff[100];
int n = 0;
while (1) {
FD_ZERO(&rfd);
FD_SET(0, &rfd);
FD_SET(clnt_sock, &rfd);
if (select(clnt_sock+1, &rfd, NULL, NULL, NULL) > 0)
{
if (FD_ISSET(clnt_sock, &rfd))
{
memset(readbuff, 0, sizeof(readbuff));
read(clnt_sock, readbuff, sizeof(readbuff));
printf("recv:%s\n", readbuff);
}
if (FD_ISSET(0, &rfd))
{
memset(sendbuff, 0, sizeof(sendbuff));
read(0, sendbuff, sizeof(sendbuff));
printf("send:%s\n", sendbuff);
write(clnt_sock, sendbuff, sizeof(readbuff));
}
}
}
close(clnt_sock);
close(serv_sock);
return 0;
}
void error_handling(char *message)
{
fputs(message, stderr);
fputc('\n', stderr);
exit(1);
}
