使用/dev/poll的str_cli函数

void str_cli(FILE *fp, int sockfd)
{
    int        stdineof;
    char       buf[MAXLINE];
    int        n;
    int        wfd;
    struct pollfd    pollfd[];
    struct dvpoll    dopoll;
    int        i;
    int        result;
 
    wfd = open("/dev/poll", O_RDWR, );
 
    pollfd[].fd = fileno(fp);
    pollfd[].events = POLLIN;
    pollfd[].revents = ;
 
    pollfd[].fd = sockfd;
    pollfd[].events = POLLIN;
    pollfd[].revents = ;
 
    write(wfd, pollfd, sizeof(struct pollfd) * );
 
    stdineof = ;
    for ( ; ; ) {
        /* block until /dev/poll says something is ready */
        dopoll.dp_timeout = -;
        dopoll.dp_nfds = ;
        dopoll.dp_fds = pollfd;
        result = ioctl(wfd, DP_POLL, &dopoll);
 
        /* loop through ready file descriptors */
        for (i = ; i < result; i++) {
            if (dopoll.dp_fds[i].fd == sockfd) {
                /* socket is readable */
                if ( (n = read(sockfd, buf, MAXLINE)) == ) {
                    if (stdineof == )
                        return;        /* normal termination */
                    else
                        err_quit("str_cli: server terminated prematurely");
                }
 
                write(fileno(stdout), buf, n);
            } else {
                /* input is readable */
                if ( (n = read(fileno(fp), buf, MAXLINE)) == ) {
                    stdineof = ;
                    shutdown(sockfd, SHUT_WR);    /* send FIN */
                    continue;
                }
 
                writen(sockfd, buf, n);
            }
        }
    }
}