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The C language structure declaration currently used for the UNIX system a.out file header is shown below. This declaration may be found in the header file aouthdr.h.
   typedef struct aouthdr
   {
       short    magic;        /* magic number */
       short    vstamp;       /* version stamp */
       long     tsize;        /* text size in bytes, padded */
                              /* to full word boundary */
   
       long     dsize;        /* initialized data size */
   
       long     bsize;        /* uninitialized data size */
   
       long     entry;        /* entry point */
   
       long     text_start;   /* base of text for this file */
   
       long     data_start    /* base of data for this file */
   
   } AOUTHDR;