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CORE(5)                       File Formats Manual                      CORE(5)

       core - format of core image file

       UNIX  writes out a core image of a terminated process when any of vari-
       ous errors occur.  See signal(2) for the list of reasons; the most com-
       mon  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).

       The first 1024 bytes of the core image are a copy of the system's  per-
       user  data for the process, including the registers as they were at the
       time of the fault; see the system listings for the format of this area.
       The  remainder  represents  the actual contents of the user's core area
       when the core image was written.  If the  text  segment  is  write-pro-
       tected and shared, it is not dumped; otherwise the entire address space
       is dumped.

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

       adb(1), signal(2)