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lec-03-prg-01-tcp-echo-server.c
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lec-03-prg-01-tcp-echo-server.c
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#include<stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#define BUFFSIZE 200
#define CLNT_MAX 10
int g_client_socket[CLNT_MAX];
int g_client_count = 0;
int g_port = 65456;
void send_all(char * msg,int my_sock){
write(my_sock,msg,strlen(msg) + 1);
// for(int i = 0; i < g_client_count;i++){
// write(g_client_socket[i],msg,strlen(msg)+1);
// }
}
int main(int argc,char ** argv){
printf("> echo-server is activated\n");
int server_socket;
struct sockaddr_in server_addr;
int client_socket;
struct sockaddr_in client_addr;
int client_addr_size;
server_socket = socket(PF_INET,SOCK_STREAM,0);
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
server_addr.sin_port = htons(g_port);
bind(server_socket,(struct sockaddr *)&server_addr,sizeof(server_addr));
listen(server_socket,5);
int recv_len = 0;
char buff[BUFFSIZE];
// int flag = 0;
while(1){
client_addr_size = sizeof(client_addr);
client_socket = accept(server_socket,(struct sockaddr *)&client_addr,&client_addr_size);
//printf("client connected!!\n");
g_client_socket[g_client_count++] = client_socket;
printf("> client connected by IP address %s with Port number %d\n",inet_ntoa(client_addr.sin_addr),client_addr.sin_port);
while(1){
recv_len = read(client_socket,buff,BUFFSIZE);
if(recv_len == -1){
continue;
}
printf("> echoed: %s\n",buff);
send_all(buff,client_socket);
if(strcmp(buff,"quit") == 0){
//flag = 1;
break;
}
}
// if(flag){
// break;
// }
}
printf("> echo-server is de-activated\n");
return 1;
}