CORE
Section: File Formats (5)
Index
Return to Main Contents
BSD mandoc
BSD 4
NAME
core
- memory image file format
SYNOPSIS
Fd #include <sys/param.h>
DESCRIPTION
A small number of signals which cause abnormal termination of a process
also cause a record of the process's in-core state to be written
to disk for later examination by one of the available debuggers.
(See
sigaction(2).)
This memory image is written to a file named
programname.core
in the working directory;
provided the terminated process had write permission in the directory,
and provided the abnormality did not cause
a system crash.
(In this event, the decision to save the core file is arbitrary, see
savecore(8).)
The maximum size of a
programname.core
file is limited by
setrlimit(2).
Files which would be larger than the limit are not created.
The
programname.core
file consists of the
Fa u .
area, whose size (in pages) is
defined by the
UPAGES
manifest in the
Aq Pa sys/param.h
file. The
Fa u .
area starts with a
Fa user
structure as given in
Aq Pa sys/user.h .
The remainder of the
programname.core
file consists of the data pages followed by
the stack pages of the process image.
The amount of data space image in the
programname.core
file is given (in pages) by the
variable
Fa u_dsize
in the
Fa u .
area.
The amount of stack image in the core file is given (in pages) by the
variable
Fa u_ssize
in the
u
area.
The size of a ``page'' is given by the constant
NBPG
(also from
Aq Pa sys/param.h ) .
SEE ALSO
adb(1),
dbx(1),
gdb(1),
kgdb(1),
sigaction(2),
setrlimit(2)
HISTORY
A
core
file format appeared in
AT&T System
v6 .
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- SEE ALSO
-
- HISTORY
-
This document was created by
man2html,
using the manual pages.
Time: 21:44:07 GMT, August 05, 2022