2.9BSD/usr/man/cat5/core.5

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

NAME
     core - format of core image file

DESCRIPTION
     UNIX writes out a core image of a terminated process when
     any of various errors occur.  See _s_i_g_n_a_l(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 _c_o_r_e 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 regis-
     ters 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 _a_d_b(1) is sufficient to deal with
     core images.

SEE ALSO
     adb(1), pstat(1), signal(2)

Printed 5/17/83                                                 1