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Unix Version 7 - man page for core (v7 section 5)

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CORE(5) 										  CORE(5)

       core - format of core image file

       UNIX  writes  out  a  core 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 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-protected
       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)

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