Working of exec family of functions

Applications Programming
1

Hi,
I am studying exec family of functions.Its man page says,it replaces the current process image with a new process image. If it replaces the binary,then after returning back,how does it get the previous parameters of the process which called exec?As replacing process image means replacing all its memory sections.
Thanks
Radha

2

exec doesn't return unless it fails to load the new image.

Regards,
Alister

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Regards,
Alister