Hello! I have read gdb-5.3 source. I know it uses primarily on x86/alpha linux platform. But a debugger can only debug the unique process, not more processes simultaneously. I think it is more likely because Linux kernel doesn't support /proc interface for gdb. I want to debug 2~4 processes with a single gdb on SMP Linux. Can you give me a help? Wang. ______________________________________ =================================================================== ¶©·Ç³£Ð¦»°³é´ó½± ²ÊÆÁÊÖ»úÒ»ÌìÒ»²¿! (http://sms.sina.com.cn/act/fcxhhd.html)