CORE(5)                 GENIX Programmer's Manual                 CORE(5)



      NAME
           core - format of memory image file

      DESCRIPTION
           UNIX writes out a memory image of a terminated process when  any  of
           various  errors  occur.   See signal(2) for the list of reasons; the
           most common are memory violations, illegal instructions, bus errors,
           and  user-generated quit signals.  The memory image is called `core'
           and is written in the process's working directory (provided  it  can
           be; normal access controls apply).

           The maximum size of a core file  is  limited  by  vlimit(2).   Files
           which would be larger than the limit are not created.

           The core file consists of the u. area, which currently consists of 4
           pages,    beginning    with   a   user   structure   as   given   in
           /usr/include/sys/user.h.  The kernel stack grows  from  the  end  of
           this  4  page region.  The remainder of the core file consists first
           of the text pages and then the data pages and the stack pages of the
           process image.

           In general the debugger ddt(1)  is  sufficient  to  deal  with  core
           images.

      SEE ALSO
           ddt(1), signal(2), vlimit(2)





























      Printed 11/16/83                                                        1