.po 1i
.TH CORE 5 Bell
.V 08/15/84 17:34:08
.\"@[$]core.5	1.4	08/15/84 17:34:08 - Zilog Inc.
.ad
.SH NAME
core \- format of core image file
.SH DESCRIPTION
ZEUS
writes a memory image of a terminated
process when any error occurs.
(See
.BR signal (2)
for the list of reasons.)
The most common errors are memory violations, illegal
instructions, and user-generated
quit signals.
The memory image, called core, is written in the process's
working directory, provided normal
access controls apply.
.PP
The first 2048 bytes of the memory 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.
The remainder represents the actual contents of
the user's memory when the image
was written.  If a user program is separate I & D, the code segment(s)
are not dumped, just the data segment(s). 
In the combined I & D case, all user segments are dumped.
In both cases the user's stack appears in the core file after all the
user segments.
.PP
The debugger
.BR adb (1)
is sufficient to deal with memory images.
.SH SEE ALSO
adb(1),
signal(2).
.SH LIMITATIONS
The name core is a throwback to an earlier era.