hal can't startup

[qiang.wang]

Hi,
  I compiled hal ver 0.4.2 on my system, but it can't be started up. And
it crashed at hald.c line 480.
sigterm_iochn = g_io_channel_unix_new(sigterm_unix_signal_pipe_fds[0]);
It returned sigterm_iochn with NULL. I wrote a test case
g_io_channel_unix_new works properly. The only difference is that in
hald.c it's called in a daemon. Then i run hald as a common process,
g_io_channel_unix_new returned a non null value. But hald doesn't work
properly, after a minute it crashed...
  Then i compiled a hal ver 0.4.8, it works fine on my system. While i
looked into the source code, i found that there's nothing difference in
the hald.c file between ver 0.4.2 and ver 0.4.8. And in the  main
function before the line 480, there's nothing relating with the other
part of haldaemon's code, I was totally confused about this.
  does anyone know what's going on in it?
  Thanks

-__-?