<div>이게 서버 소스..</div> <div>#include <stdio.h><br>#include <sys/types.h><br>#include <sys/socket.h><br>#include <unistd.h><br>#include <stdlib.h><br>#include <errno.h><br>#include <arpa/inet.h><br>#include <netinet/in.h><br>#include <string.h><br>#include <signal.h><br>#define Maxlen 1024<br>#define ERR_EXIT(m) \<br>    do { \<br>        perror(m); \<br>        exit(EXIT_FAILURE); \<br>    } while (0)</div> <div>void do_service(int);</div> <div>int main(void)<br>{<br>    long maxlen;<br>    signal(SIGCHLD, SIG_IGN);//좀비 프로세스 이용<br>    int listenfd; //used for listening<br>    if ((listenfd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)<br>        //  listenfd = socket(AF_INET, SOCK_STREAM, 0)<br>        ERR_EXIT("socket error");</div> <div>    struct sockaddr_in servaddr;<br>    memset(&servaddr, 0, sizeof(servaddr));<br>    servaddr.sin_family = AF_INET;//Internet Address cluster<br>    servaddr.sin_port = htons(4567);//Port Number<br>    //servaddr.sin_addr.s_addr = htonl(INADDR_ANY);//IP address<br>    servaddr.sin_addr.s_addr = inet_addr("127.0.0.1"); <br>    /* inet_aton("127.0.0.1", &servaddr.sin_addr); */</div> <div>    int on = 1;<br>    if (setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)<br>        ERR_EXIT("setsockopt error");</div> <div>    if (bind(listenfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0)<br>        ERR_EXIT("bind error");</div> <div>    if (listen(listenfd, SOMAXCONN) < 0) <br>        ERR_EXIT("listen error");</div> <div>    struct sockaddr_in peeraddr; //construct the struct for sockaddr_in<br>    socklen_t peerlen = sizeof(peeraddr); //needs to be initialized<br>    int conn; // connected sockfd</div> <div>    pid_t pid;</div> <div>    while (1)<br>    {<br>        if ((conn = accept(listenfd, (struct sockaddr *)&peeraddr, &peerlen)) < 0)<br>            ERR_EXIT("accept error");<br>        printf("recv connect ip=%s port=%d\n", inet_ntoa(peeraddr.sin_addr),<br>               ntohs(peeraddr.sin_port));</div> <div>        pid = fork();<br>        if (pid == -1)<br>            ERR_EXIT("fork error");<br>        if (pid == 0)<br>        {<br>            // 자식 프로세스<br>            close(listenfd);<br>            do_service(conn);<br>            exit(EXIT_SUCCESS);<br>        }<br>        else<br>            close(conn); //부모 프로세스<br>    }</div> <div>    return 0;<br>}</div> <div>void do_service(int conn)<br>{<br>    char recvbuf[1024];<br>    long maxlen;<br>    while (1)<br>    {<br>        memset(recvbuf, 0, sizeof(recvbuf));<br>        int ret = read(conn, recvbuf, sizeof(recvbuf));<br>        if (ret == 0)   //클라이언트 종료<br>        {<br>            printf("client close\n");<br>            break;<br>        }<br>        else if (ret == -1)<br>            ERR_EXIT("read error");<br>        fputs(recvbuf, stdout);<br>        //printf("msg received from client:%s\n",recvbuf );<br>        write(conn, "msg received\n", 1024);<br>    }<br>}</div> <div>=======================</div> <div>#include <stdio.h><br>#include <sys/types.h><br>#include <sys/socket.h><br>#include <unistd.h><br>#include <stdlib.h><br>#include <errno.h><br>#include <arpa/inet.h><br>#include <netinet/in.h><br>#include <string.h></div> <div><br>#define ERR_EXIT(m) \<br>    do { \<br>        perror(m); \<br>        exit(EXIT_FAILURE); \<br>    } while (0)</div> <div> </div> <div><br>int main(int argc,char* argv[])<br>{<br>    int sock,rec_len;<br>    struct sockaddr_in servaddr;<br>    char sendbuf[1024] = {0};<br>    char recvbuf[1024] = {0};<br>    char ipaddress[20];<br>    /*if(argc!=2)<br>    {<br>        printf("parameter wrong:which should be like this --ppclient 127.0.0.1 4567\n");<br>        exit(0);<br>    }*/</div> <div><br>      if(argc!=4)<br>    {<br>        printf("parameter wrong:which should be like this --ppclient 127.0.0.1 4567\n");<br>        exit(0);<br>    }<br>    if ((sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)<br>        //  listenfd = socket(AF_INET, SOCK_STREAM, 0)<br>        ERR_EXIT("socket error");</div> <div> </div> <div>    memset(&servaddr, 0, sizeof(servaddr));<br>    servaddr.sin_family = AF_INET;<br>    //servaddr.sin_port = htons(4567);</div> <div>    servaddr.sin_port=htons(atoi(argv[3]));</div> <div>    //servaddr.sin_addr.s_addr = inet_addr("127.0.0.1");<br>    /* inet_aton("127.0.0.1", &servaddr.sin_addr); */</div> <div><br>    memset(ipaddress,0,sizeof(ipaddress));<br>    //sprintf(ipaddress,"%s",argv[1]);<br>    sprintf(ipaddress,"%s",argv[2]);<br>    if(inet_aton(ipaddress,&servaddr.sin_addr)==0)<br>    {<br>        printf("inet_aton error for :%s\n",ipaddress);<br>        exit(0);<br>    }</div> <div>    if (connect(sock, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0)<br>        ERR_EXIT("connect error");</div> <div>    printf("send msg to server:\n");</div> <div>    <br>    while (fgets(sendbuf, sizeof(sendbuf), stdin) != NULL)<br>    {</div> <div>        write(sock, sendbuf, strlen(sendbuf));<br>        read(sock, recvbuf, sizeof(recvbuf));</div> <div>        //printf("Received msg:%s\n",recvbuf);<br>        fputs(recvbuf, stdout);</div> <div>        memset(sendbuf, 0, sizeof(sendbuf));<br>        memset(recvbuf, 0, sizeof(recvbuf));<br>    }</div> <div><br>    close(sock);</div> <div><br>    return 0;<br>}</div> <div>이게 클라이언트 소스인데요</div> <div>클라이언트를 리눅스에서 컴파일해서 실행하면</div> <div>parameter wrong:which should be like this --ppclient 127.0.0.1 4567</div> <div>이렇게 뜨는데 포트가 열려있지않다는 말인가요??</div> <div>해결방법좀 알려주세요 ㅠㅠ </div>