Hello,
> But,
> There can also be a background user program. What happens on that case.
> eg,
> int main()
> {
> scanf(...);
> }
>
> and i run it as ./my &
Yeah i know what a background process is, but as told to you
before, it's a concept of shell and is not implemented by the
OS/kernel. By writing './my &' at the shell prompt, you are telling
shell to run my as a background process. The POSIX theory you refered
to doesn't refer to this kind of process as this process does have a
controlling terminal and can safely read/write from/to the terminal.
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