급!!!!!! TCP/IP를 이용한 채팅 프로그램 소스(Server, Client ) 수정 좀 부탁드려요..

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>
 
void error_handling(char *message);
 
int main(int argc, char **argv)
{
    int serv_sock;
    int clnt_sock;
    int nPort = 8800;
    struct sockaddr_in serv_addr;
    struct sockaddr_in clnt_addr;
    int clnt_addr_size;
 
    if(argc!=2)
    {
        nPort = atoi(argv[1]);
        printf( "Port : %d\n", nPort);
    }
 
    serv_sock=socket(PF_INET, SOCK_STREAM, 0);
    printf("채팅방 생성.\n");
 
    if(serv_sock == -1)
        error_handling("socket() 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(nPort);
 
    if( bind(serv_sock, (struct sockaddr*) &serv_addr, sizeof(serv_addr))==-1)
    {
        printf("서버가 생성 되었습니다. \n", serv_sock);
        error_handling("bind() error");
    }
 
    if( listen(serv_sock, 5)==-1 )
        error_handling("listen() error");
 
    clnt_addr_size=sizeof(clnt_addr);
 
    for(; ;)
    {
        clnt_sock=accept(serv_sock, (struct sockaddr*) &clnt_addr, &clnt_addr_size);
        if(clnt_sock==-1)
        {
            error_handling("accept() error");
        }
 
        printf( "클라이언트가 접속 하였습니다.\n");
    }
 
 
    if( read(clnt_sock, (struct sockaddr*)&clnt_addr, sizeof(clnt_addr))==-0)
        error_handling("read() error");
        printf("%s > \n");
 
    if( write(clnt_sock, (struct sockaddr*)&clnt_addr, sizeof(clnt_addr))==-0)
        error_handling("write() error");
        printf("%s < \n");
 
    close(clnt_sock);
 
    return 0;
}
 
void error_handling(char *message)
{
    fputs(message, stderr);
    fputc('\n', stderr);
    exit(1);
}

#include <sys/socket.h>
 
void error_handling(char *message);
 
int main(int argc, char **argv)
{
    int sock;
    char message[30];
    int str_len;
 
    struct sockaddr_in serv_addr;
 
    if(argc!=3)
    {
        printf("User : %s <IP> <PORT>\n", argv[2]);
        exit(1);
    }
 
    sock=socket(PF_INET, SOCK_STREAM, 0);
    if(sock == -1)
        error_handling("socket() error");
 
    memset(&serv_addr, 0, sizeof(serv_addr));
    serv_addr.sin_family=AF_INET;
    serv_addr.sin_addr.s_addr=inet_addr(argv[1]);
    serv_addr.sin_port=htons(atoi(argv[2]));
 
    if( connect(sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr))==-1)
        error_handling("connect() error!");
 
    str_len=read(sock, message, sizeof(message)-1);
    if (str_len==-1)
        error_handling("read() error!");
    message[str_len]=0;
    printf("From Server : %s \n", message);
    close(sock);
}
 
void error_handling(char *message)
{
    fputs(message, stderr);
    fputc('\n', stderr);
    exit(1);
}