ProFTPD Developer's Guide: API Unions

ProFTPD Version 1.2

 union align {

   char *cp;
   void (*f)();
   long l;
   FILE *fp;
   double d;

 }

 union block_hdr {

   union align a;

   /* actual header */
   struct {
             
     char *endp;
     union block_hdr *next;
     char *first_avail;

   } h;

 }