accept阻塞

一直以来以为accept阻塞的时候，若另有线程关闭相应的监听套接字，accept会立即返回。

今天先是在NDK上试，没反应。又在ARCHLINUX试了下，还是没反应。难道是我一直记的都是错的!!!!!!!!!!!!!!!!写下来，以做备忘，同时写一份非阻塞的ACCEPT

int tcp_accept_timed( int fd, int msecs )
{
    int rc, connfd;
    struct timeval tv;
    fd_set rset;
    struct sockaddr_in sin;
    socklen_t len;

    do
    {
        tv.tv_sec = msecs / 1000;
        tv.tv_usec = ( msecs % 1000 ) * 1000;

        FD_ZERO( &rset );
        FD_SET( fd, &rset );
    }
    while ( ( rc = select( fd + 1, &rset, NULL, NULL, &tv ) ) == -1 && errno == EINTR );
    if ( rc < 1 )
    {
        if ( rc == -1 )
        {
            perror( "select" );
        }
        return -1;
    }

    len = sizeof( struct sockaddr_in );
    memset( &sin, 0, len );
    connfd = accept( fd, ( struct sockaddr* )&sin, &len );
    if ( connfd == -1 )
    {
        perror( "accept" );
    }
    else
    {
        fprintf( stdout, "peer address ------ [%s:%d]
", inet_ntoa( sin.sin_addr ), ntohs( sin.sin_port ) );
    }

    return connfd;
}