That is a typedef of a function. In this case the need was for portability -windows compiler versus maybe a linux C compiler.
No dataype declaration for the function. So, by default, the function will compile probably with a warning as a function that returns an integer.

So you do not worry about the platform, you will notice void * arguments. This lets you call COMPARE_ADDR with any datatypes as long as those datatypes are by reference (address of the object). It does not have a datatype for the function return. This kind of function typedef is usually done for situations where you want to call something to get a standard result, but windows and linux (example platform) do not have the same name for the function, but it may return { <0, 0, >0} for less than, equal to, or greater than.

Pretend example

Code:

#ifdef WIN32 
   COMPARE_ADDR=isequal;
#else
   COMPARE_ADDR=addr_foo;
#endif
/* see if the memory location of two variables is the same */
if  ( ! COMPARE_ADDR( &variable3, &variable1) {  /* if equal barf */
    errno=EINVAL;  /* invalid value error code */
    perror("Cannot continue, variables are identical and must not be identical\n");
    exit(1);   /* end program here */
}