echo "$wanip"

#!/bin/sh
# fixip.sh
#fix vicp ip

export PATH="/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/phlinux"

disUrl='http://192.168.2.1/userRpm/StatusRpm.htm?Disconnect=断%20开&wan=1'
conUrl='http://192.168.2.1/userRpm/StatusRpm.htm?Connect=连%20接&wan=1'
wg='wget -q --user=admin --password=admin -O - '

c=0
while [ "$c" -lt "5" ]
do
  wip=`wan.sh`
  vicp=`nslookup myhome.vicp.net | tail -n2 | grep "Address" | awk '{print $2}'`

  if [ "$wip" == "$vicp" ]; then
    echo "Match done."
    exit 0
  fi

  echo "my wan ip : "$wip
  echo "myhome.vicp.net : "$vicp
  echo "Fix ip ..."

  if [ -n wip ]; then
    echo "  disconnect PPPoe ..."
    `$wg $disUrl > /dev/null`
    sleep 3
  fi

  echo "  connect PPPoE ..."
  `$wg $conUrl > /dev/null`
  sleep 37

  c=`expr $c + 1`
done

  buffer_prepare_copy(hctx->response, 1024);
  if (-1 == (n = read(hctx->fd, hctx->response->ptr, hctx->response->size - 1))) {
   if (errno == EAGAIN || errno == EINTR) {
    /* would block, wait for signal */
    return FDEVENT_HANDLED_NOT_FINISHED;
   }
......
  } else {
   http_chunk_append_mem(srv, con, hctx->response->ptr, hctx->response->used);
   joblist_append(srv, con);
  }

mod_cgi通过hctx->fd从cgi读取数据，然后由http_chunk_append_men()提交到后台，但chunk_append却没有限制内存的使用，当从cgi读取的速度快过提交给client速度时内存用量就会不断增加。本来想通过signal来同步cgi的采样，但这样太麻烦而且会破坏mod_cgi的结构，试着在read(hctx->fd...前加个阻塞判断：
if (http_chunkqueue_length(server *srv, connection *con) > 102400) {
  return FDEVENT_HANDLED_NOT_FINISHED;
}
if (-1==(n=read(hctx->fd...

然后在spca5shot里每采样一frame加个sleep(1)，运行几天看效果再说