SCNHDR(4)            INTERACTIVE UNIX System            SCNHDR(4)



          NAME
               scnhdr - section header for a common object file

          SYNOPSIS
               #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 sec-
               tion within an object file has its own header.  The C struc-
               ture 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(4)].  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(1), fseek(3S), a.out(4).

















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