how to debug socket child process with bind function inside?

[Dan Yu Liu]

hello all:
 i met a program to debug socket child process with bind function.
I knew the method to debug a child process using DDD.
but when i use the same method to debug the socket child process.
i met the binding problem, because socket program cannot bind one port
twice.
the method i used like this:
first open DDD twice $>ddd program1 & ddd program1
then find the pid number returned by fork function
and use DDD command attach to process!
but it was fail, the reason is the parent program already use the
bind function to the PORT, the child program cannot bind the PORT again!


what should I do?

Thank you very much!