gdb attach 之后没反应？

pppStar

root@dev:/mnt/nfs/video# ./arm-gdb ./video 793  
GNU gdb 6.8
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "arm-linux"...
Attaching to program: /mnt/nfs/video/video, process 793
Reading symbols from /lib/libpthread.so.0...done.
[Thread debugging using libthread_db enabled]
[New Thread 0x4001f1e0 (LWP 793)]

没反应？