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core(5) [opendarwin man page]

CORE(5) 						      BSD File Formats Manual							   CORE(5)

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 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 various 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 privlaged user must edit /etc/hostconfig to contain the line: COREDUMPS=-YES- SEE ALSO
gdb(1), setrlimit(2), sigaction(2), Mach-O(5), sysctl(8) HISTORY
A core file format appeared in Version 6 AT&T UNIX. BSD
March 18, 2002 BSD

Check Out this Related Man Page

gcore(1)						    BSD General Commands Manual 						  gcore(1)

gcore -- get core images of running processes SYNOPSIS
gcore [-s] [-v] [-b size] [-o path | -c pathformat] pid DESCRIPTION
The gcore program creates a core file image of the process specified by pid. The resulting core file can be used with a debugger, e.g. lldb(1), to examine the state of the process. The following options are available: -s Suspend the process while the core file is captured. -v Report progress on the dump as it proceeds. -b size Limit the size of the core file to size MiBytes. The following options control the name of the core file: -o path Write the core file to path. -c pathformat Write the core file to pathformat. The pathformat string is treated as a pathname that may contain various special characters which cause the interpolation of strings representing specific attributes of the process into the name. Each special character is introduced by the % character. The format characters and their meanings are: N The name of the program being dumped, as reported by ps(1). U The uid of the process being dumped, converted to a string. P The pid of the process being dumped, converted to a string. T The time when the core file was taken, converted to ISO 8601 format. % Output a percent character. The default file name used by gcore is %N-%P-%T. By default, the core file will be written to a directory whose name is determined from the kern.corefile MIB. This can be printed or modified using sysctl(8). The directory where the core file is to be written must be accessible to the owner of the target process. gcore will not overwrite an existing file, nor will it create missing directories in the path. EXIT_STATUS The gcore utility exits 0 on success, and >0 if an error occurs. FILES
/cores/%N-%P-%T default pathname for the corefile. BUGS
With the -b flag, gcore writes out as much data as it can up to the specified limit, even if that results in an incomplete core image. Such a partial core dump may confuse subsequent programs that attempt to parse the contents of such files. SEE ALSO
lldb(1), core(5), Mach-O(5), sysctl(8), sudo(8). Darwin May 31, 2019 Darwin
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