CORE(4)              INTERACTIVE UNIX System              CORE(4)



          NAME
               core - format of core image file

          DESCRIPTION
               The UNIX system writes out a core image of a terminated pro-
               cess 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 core image is called core and is written in
               the process's working directory (provided it can be; normal
               access controls apply).  A process with an effective user ID
               different from the real user ID will not produce a core
               image.

               The first section of the core image is a copy of the
               system's per-user data for the process, including the regis-
               ters as they were at the time of the fault.  The size of
               this section depends on the parameter USIZE, which is
               defined in <sys/param.h>.  The remainder represents the
               actual contents of the user's core area when the core image
               was written.  If the text segment is read-only and shared,
               or separated from data space, it is not dumped.

               The format of the information in the first section is
               described by the user structure of the system, defined in
               <sys/user.h>.  Not included in this file are the locations
               of the registers.  These are outlined in <sys/reg.h>.

          SEE ALSO
               sdb(1), setuid(2), signal(2).
               crash(1M) in the INTERACTIVE UNIX System User's/System
               Administrator's Reference Manual.























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