令Apache中沉睡的无用进程自动退出的方法

    127.0.0.1 - - [05/May/2011:10:54:07 +0800] "OPTIONS * HTTP/1.0" 200 -
    127.0.0.1 - - [05/May/2011:10:54:08 +0800] "OPTIONS * HTTP/1.0" 200 -
    127.0.0.1 - - [05/May/2011:10:54:09 +0800] "OPTIONS * HTTP/1.0" 200 -
    127.0.0.1 - - [05/May/2011:10:54:10 +0800] "OPTIONS * HTTP/1.0" 200 -

static apr_status_t pod_signal_internal(ap_pod_t *pod)
    {
        apr_status_t rv;
        char char_of_death = '!';
        apr_size_t one = 1;
    
        rv = apr_file_write(pod->pod_out, &char_of_death, &one);
        if (rv != APR_SUCCESS) {
            ap_log_error(APLOG_MARK, APLOG_WARNING, rv, ap_server_conf,
                         "write pipe_of_death");
        }
    
        return rv;
    }

static apr_status_t dummy_connection(ap_pod_t *pod)
    {
    //...有省略
        /* Create the request string. We include a User-Agent so that
         * adminstrators can track down the cause of the odd-looking
         * requests in their logs.
         */
        srequest = apr_pstrcat(p, "OPTIONS * HTTP/1.0\r\nUser-Agent: ",
                               ap_get_server_banner(),
                               " (internal dummy connection)\r\n\r\n", NULL);
    //...有省略
    }

static void child_main(int child_num_arg)
    {
    //...有省略
    
        while (!die_now && !shutdown_pending) {
    //...有省略
            //1. listen
            //2. accept
            //3. process request
    
            /* Check the pod and the generation number after processing a
             * connection so that we'll go away if a graceful restart occurred
             * while we were processing the connection or we are the lucky
             * idle server process that gets to die.
             */
            if (ap_mpm_pod_check(pod) == APR_SUCCESS) { /* selected as idle? */
                die_now = 1;
            }
    //...有省略
       }
    //...有省略
    }