*****Listing 8*****



     typedef unsigned long signature;
     typedef struct header {
          signature signature;       /* special signature */
          int size;                  /* declare as int: 16 or 32 bit */
          struct header * fwd;       /* forward pointer */
          struct header * bwd;       /* backward pointer */
          long count;                /* event counter at allocation */
          unsigned short checksum;   /* checksum of data */
          char * name;               /* name pointer for event */
          } header;

     typedef struct trailer {
         signature signature;
         } trailer;

     static header root;
     static long   event_counter = 0L;

     #define SIGNATURE 0x12345678L

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