nlist.h

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struct nlist {
    union {
        char      *n_name;   /* for use when in-core */
        long       n_strx;   /* index into file string table */
    } n_un;
    unsigned char  n_type;   /* type flag; see below */
    unsigned char  n_sect;   /* section number or NO_SECT */
    short          n_desc;   /* see the header file stab.h */
    unsigned       n_value;  /* value of this symbol table entry
                    (or stab offset) */
};

#define N_STAB  0xe0  /* if any bits are set, this is a symbolic
             debugging entry */
#define N_TYPE  0x1e  /* mask for the type bits */
#define N_EXT   0x01  /* external symbol bit; set for external
             symbols */

#define N_UNDF  0x0   /* undefined; n_sect == NO_SECT */
#define N_ABS   0x2   /* absolute; n_sect == NO_SECT */
#define N_SECT  0xe   /* defined in section number n_sect */
#define N_INDR  0xa   /* indirect */

#define NO_SECT     0   /* the symbol isn't in any section */
#define MAX_SECT  255   /* 1 through 255 inclusive */

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