리눅스에서 채팅프로그램을 돌려는데..

이게 서버 소스..

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <string.h>
#include <signal.h>
#define Maxlen 1024
#define ERR_EXIT(m) \
    do { \
        perror(m); \
        exit(EXIT_FAILURE); \
    } while (0)

void do_service(int);

int main(void)
{
    long maxlen;
    signal(SIGCHLD, SIG_IGN);//좀비 프로세스 이용
    int listenfd; //used for listening
    if ((listenfd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
        // listenfd = socket(AF_INET, SOCK_STREAM, 0)
        ERR_EXIT("socket error");

    struct sockaddr_in servaddr;
    memset(&servaddr, 0, sizeof(servaddr));
    servaddr.sin_family = AF_INET;//Internet Address cluster
    servaddr.sin_port = htons(4567);//Port Number
    //servaddr.sin_addr.s_addr = htonl(INADDR_ANY);//IP address
    servaddr.sin_addr.s_addr = inet_addr("127.0.0.1");
    /* inet_aton("127.0.0.1", &servaddr.sin_addr); */

    int on = 1;
    if (setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
        ERR_EXIT("setsockopt error");

if (bind(listenfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0)
ERR_EXIT("bind error");

if (listen(listenfd, SOMAXCONN) < 0)
ERR_EXIT("listen error");

    struct sockaddr_in peeraddr; //construct the struct for sockaddr_in
    socklen_t peerlen = sizeof(peeraddr); //needs to be initialized
    int conn; // connected sockfd

pid_t pid;

    while (1)
    {
        if ((conn = accept(listenfd, (struct sockaddr *)&peeraddr, &peerlen)) < 0)
            ERR_EXIT("accept error");
        printf("recv connect ip=%s port=%d\n", inet_ntoa(peeraddr.sin_addr),
               ntohs(peeraddr.sin_port));

        pid = fork();
        if (pid == -1)
            ERR_EXIT("fork error");
        if (pid == 0)
        {
            // 자식 프로세스
            close(listenfd);
            do_service(conn);
            exit(EXIT_SUCCESS);
        }
        else
            close(conn); //부모 프로세스
    }

return 0;
}

void do_service(int conn)
{
    char recvbuf[1024];
    long maxlen;
    while (1)
    {
        memset(recvbuf, 0, sizeof(recvbuf));
        int ret = read(conn, recvbuf, sizeof(recvbuf));
        if (ret == 0)   //클라이언트 종료
        {
            printf("client close\n");
            break;
        }
        else if (ret == -1)
            ERR_EXIT("read error");
        fputs(recvbuf, stdout);
        //printf("msg received from client:%s\n",recvbuf );
        write(conn, "msg received\n", 1024);
    }
}

=======================

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <string.h>

#define ERR_EXIT(m) \
    do { \
        perror(m); \
        exit(EXIT_FAILURE); \
    } while (0)

int main(int argc,char* argv[])
{
    int sock,rec_len;
    struct sockaddr_in servaddr;
    char sendbuf[1024] = {0};
    char recvbuf[1024] = {0};
    char ipaddress[20];
    /*if(argc!=2)
    {
        printf("parameter wrong:which should be like this --ppclient 127.0.0.1 4567\n");
        exit(0);
    }*/

      if(argc!=4)
    {
        printf("parameter wrong:which should be like this --ppclient 127.0.0.1 4567\n");
        exit(0);
    }
    if ((sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
        // listenfd = socket(AF_INET, SOCK_STREAM, 0)
        ERR_EXIT("socket error");

    memset(&servaddr, 0, sizeof(servaddr));
    servaddr.sin_family = AF_INET;
    //servaddr.sin_port = htons(4567);

servaddr.sin_port=htons(atoi(argv[3]));

//servaddr.sin_addr.s_addr = inet_addr("127.0.0.1");
/* inet_aton("127.0.0.1", &servaddr.sin_addr); */

    memset(ipaddress,0,sizeof(ipaddress));
    //sprintf(ipaddress,"%s",argv[1]);
    sprintf(ipaddress,"%s",argv[2]);
    if(inet_aton(ipaddress,&servaddr.sin_addr)==0)
    {
        printf("inet_aton error for :%s\n",ipaddress);
        exit(0);
    }

if (connect(sock, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0)
ERR_EXIT("connect error");

printf("send msg to server:\n");

    while (fgets(sendbuf, sizeof(sendbuf), stdin) != NULL)
    {

write(sock, sendbuf, strlen(sendbuf));
read(sock, recvbuf, sizeof(recvbuf));

//printf("Received msg:%s\n",recvbuf);
fputs(recvbuf, stdout);

        memset(sendbuf, 0, sizeof(sendbuf));
        memset(recvbuf, 0, sizeof(recvbuf));
    }

close(sock);

return 0;
}

이게 클라이언트 소스인데요

클라이언트를 리눅스에서 컴파일해서 실행하면

parameter wrong:which should be like this --ppclient 127.0.0.1 4567

이렇게 뜨는데 포트가 열려있지않다는 말인가요??

해결방법좀 알려주세요 ㅠㅠ