GCORE(1)		     GNU Development Tools		      GCORE(1)


NAME
       gcore - Generate a core file of a running program

SYNOPSIS
       gcore [-a] [-o prefix] [-d directory] pid1 [pid2...pidN]

DESCRIPTION
       Generate core dumps of one or more running programs with process IDs
       pid1, pid2, etc.	 A core file produced by gcore is equivalent to one
       produced by the kernel when the process crashes (and when "ulimit -c"
       was used to set up an appropriate core dump limit).  However, unlike
       after a crash, after gcore finishes its job the program remains running
       without any change.

OPTIONS
       -a  Dump all memory mappings.  The actual effect of this option depends
	   on the Operating System.  On GNU/Linux, it will disable
	   "use-coredump-filter" and enable "dump-excluded-mappings".

       -o prefix
	   The optional argument prefix specifies the prefix to be used when
	   composing the file names of the core dumps.	The file name is
	   composed as prefix.pid, where pid is the process ID of the running
	   program being analyzed by gcore.  If not specified, prefix defaults
	   to gcore.

       -d directory
	   Use directory as the data directory when invoking GDB for running
	   the gcore command. This argument is optional.

ENVIRONMENT
SEE ALSO
       The full documentation for GDB is maintained as a Texinfo manual.  If
       the "info" and "gdb" programs and GDB's Texinfo documentation are
       properly installed at your site, the command

	       info gdb

       should give you access to the complete manual.

       Using GDB: A Guide to the GNU Source-Level Debugger, Richard M.
       Stallman and Roland H. Pesch, July 1991.

COPYRIGHT
       Copyright (c) 1988-2024 Free Software Foundation, Inc.

       Permission is granted to copy, distribute and/or modify this document
       under the terms of the GNU Free Documentation License, Version 1.3 or
       any later version published by the Free Software Foundation; with the
       Invariant Sections being "Free Software" and "Free Software Needs Free
       Documentation", with the Front-Cover Texts being "A GNU Manual," and
       with the Back-Cover Texts as in (a) below.

       (a) The FSF's Back-Cover Text is: "You are free to copy and modify this
       GNU Manual.  Buying copies from GNU Press supports the FSF in
       developing GNU and promoting software freedom."

gdb-16.3			  2025-04-20			      GCORE(1)