data seqments address

When a process forks a child, they share the text(code)  but the data seqments are different.I use variables: edata, end to get the addresses of data part of the child process and its parent process but they are the same. I think because they are offset address. Is there system call that can get the segment address?
Please tell me the way to show that the data seqments of one process and its child process are different.
pttthaoAsked:
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rbrCommented:
I think you can't since this is very system specific. Very processor ad unix flavour use a different memory controlling method. If you want to share memory between 2 processes you have to use shared memory.

Check
http://yara.ecn.purdue.edu/~pplinux/PPHOWTO/pphowto.html
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