ioctl(2) vs sys/ioctl.h

[Paul Goyette <paul%whooppee.com@localhost>]

Is there some reason why there is a discrepancy in the definition of 
ioctl()?

From man page ioctl(2)

        SYNOPSIS
             #include <sys/ioctl.h>

             int
             ioctl(int d, unsigned long request, void *argp);


Yet, from sys/ioctl.h we have

        __BEGIN_DECLS
        int     ioctl(int, unsigned long, ...);
        __END_DECLS


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