SCNHDR(F)                            UNIX System V



     Name
          scnhdr - section header for a common object file


     Syntax
          #include  <scnhdr.h>


     Description
          Every common object file has a table of section  headers  to
          specify  the  layout  of  the  data  within  the file.  Each
          section within an object file has its  own  header.   The  C
          structure appears below.

          struct  scnhdr
          {
                  char            s_name[SYMNMLEN]; /* section name */
                  long            s_paddr;     /* physical address */
                  long            s_vaddr;     /* virtual address */
                  long            s_size;      /* section size */
                  long            s_scnptr;    /* file ptr to raw data */
                  long            s_relptr;    /* file ptr to relocation */
                  long            s_lnnoptr;   /* file ptr to line numbers */
                  unsigned short  s_nreloc;    /* # reloc entries */
                  unsigned short  s_nlnno;     /* # line number entries */
                  long            s_flags;     /* flags */
          } ;

          File pointers are byte offsets into the file;  they  can  be
          used  as the offset in a call to FSEEK [see ldfcn(F)].  If a
          section is initialized, the file contains the actual  bytes.
          An  uninitialized  section  is somewhat different.  It has a
          size, symbols defined in it, and symbols that refer  to  it.
          But  it  can  have  no  relocation entries, line numbers, or
          data.  Consequently, an uninitialized  section  has  no  raw
          data  in  the  object  file,  and  the  values for s_scnptr,
          s_relptr, s_lnnoptr, s_nreloc, and s_nlnno are zero.


     See Also
          ld(CP), fseek(S), a.out(F)


     (printed 2/15/90)                                  SCNHDR(F)