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Redirect STDIN before exec call

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I need to write a quick interface program (c or c++) to replace a perl script. The problem is that it has to do some redirection. I need to redirect STDIN to a file and then redirect STDOUT to a file then exec a program. (This is actually a call to qmail queue which takes input form STDIN and STDOUT). How do I redirect STDIN and STDOUT and then make the call.
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