core(4)								       core(4)

NAME    [Toc]    [Back]

     core - format of core image file

SYNOPSIS    [Toc]    [Back]

     #include <core.out.h>

DESCRIPTION    [Toc]    [Back]

     The IRIX system 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).  A	process	with an	effective user ID different
     from the real user	ID does	not produce a core image.

     The format	of the core image is defined by	<core.out.h>.  It consists of
     a header, maps, descriptors, and section data.

     The header	data includes the process name (as in ps(1)), the signal that
     caused the	core dump, the descriptor array, and the corefile location of
     the map array.

     Each descriptor defines the length	of useful process data.	 One
     descriptor	defines	the general-purpose registers at the time of the core
     dump for example.	The data is present in the core	image at the file
     location given in the descriptor only if the IVALID flag is set in	the
     descriptor.

     Each map defines the virtual address and length of	a section of the
     process at	the time of the	core dump.  The	data is	present	in the core
     image at the file location	given in the descriptor	only if	the VDUMPED
     flag is set in the	map.  The process's stack and data sections are
     normally written in the core image.  The process's	text is	not normally
     written in	the core image.

NOTE    [Toc]    [Back]

     Core image	format designed	by Silicon Graphics, Inc.

SEE ALSO    [Toc]    [Back]

     dbx(1), ps(1), setuid(2), signal(2).


									PPPPaaaaggggeeee 1111