core(5) File Formats Manual core(5)Name
core - format of memory image file
Syntax
#include <sys/param.h>
Description
When certain errors result in a terminated process, a file is created that contains the memory image of a terminated process. A process
can terminate for several reasons; however, the most common causes are memory violations, illegal instructions, bus errors, and user-gener-
ated quit signals. The reference page contains a list of the causes.
The is created in the working directory of the terminated process (normal access controls apply). The maximum size of a cannot exceed the
limit imposed by
The file consists of the u. area, whose size (in pages) is defined by the UPAGES manifest in the <sys/param.h> file. The u. area starts
with a user structure as given in <sys/user.h>. The remainder of the file consists first of the data pages and then the stack pages of the
process image. The amount of data space image in the file is given (in pages) by the variable u_dsize in the u. area. The amount of stack
image in the file is given (in pages) by the variable u_ssize in the u. area. The size of a page is given by the constant NBPG (also from
<sys/param.h>).
See Alsodbx(1), sigvec(2), setrlimit(2)
RISC core(5)
Check Out this Related Man Page
CORE(5) BSD File Formats Manual CORE(5)NAME
core -- memory image file format
SYNOPSIS
#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 by default
core.pid, where pid is the process ID of the process, in the /cores directory, provided the terminated process had write permission in the
directory, and the directory existed.
The maximum size of a core file is limited by setrlimit(2). Files which would be larger than the limit are not created.
The core file consists of the Mach-O(5) header as described in the <mach-o/loader.h> file. The remainder of the core file consists of vari-
ous sections described in the Mach-O(5) header.
NOTE
Core dumps are disabled by default under Darwin/Mac OS X. To re-enable core dumps, a privileged user must do one of the following
* Edit /etc/launchd.conf or $HOME/.launchd.conf and add a line specifying the limit limit core unlimited
* A privileged user can also enable cores with launchctl limit core unlimited
* A privileged user can also enable core files by using ulimit(1) or limit(1) depending upon the shell.
SEE ALSO gdb(1), setrlimit(2), sigaction(2), Mach-O(5), launchd.conf(5), launchd.plist(5), sysctl(8)HISTORY
A core file format appeared in Version 6 AT&T UNIX.
BSD June 26, 2008 BSD
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