BSD 2.11 - man page for core (bsd section 5)

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CORE(5) 										  CORE(5)

       core - format of memory image file

       #include <sys/param.h>

       The  UNIX  System  writes  out  a memory image of a terminated process when any of various
       errors occur.  See sigvec(2) for the list of reasons; the most common  are  memory  viola-
       tions,  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 core file consists of the u.  area, whose size (in 64 byte `clicks') is defined by the
       USIZE manifest in the <sys/param.h> file.  The u.  area starts with a  user  structure  as
       given in <sys/user.h>.  The rest of the u.  area consists of the kernel stack for the ter-
       minated process which includes (among other things) the processor registers at the time of
       the fault; see the system listings for the format of this area.	The remainder of the core
       file consists first of the data pages and then the stack pages of the process image.   The
       amount  of  data space image in the core file is given (in clicks) by the variable u_dsize
       in the u.  area.  If the text segment was not write-only and and shared it is included  as
       the  first etext bytes of the data image where etext is taken from the symbol table of the
       object file which generated the memory image.  The amount of stack image in the core  file
       is given (in clicks) by the variable u_ssize in the u.  area.

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

       adb(1), sigvec(2), stack(5)

3rd Berkeley Distribution		 January 26, 1987				  CORE(5)
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