In a correct way, you do this using .xs file, which then will be translated to c during make build process (xsubpp does the real translation). That *.xs file is actually a wrapper to your c file nad/or library.

There are some less "strict" ways to declare subroutines from C to make Perl to be able to use them, but I'll not say to you how to do that, because you'll shoot your leg...
(let me know if I should share my "easier" but not-supported experience with you)

Courage, the Cowardly Dog

In reply to Re: embedded perl calls c subroutines by Courage
in thread embedded perl calls c subroutines by Anonymous Monk

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