GCORE(1)                FreeBSD General Commands Manual               GCORE(1)

NAME
     gcore - get core images of running process

SYNOPSIS
     gcore [-f] [-k] [-c core] [executable] pid

DESCRIPTION
     The gcore utility creates a core image of the specified process, suitable
     for use with gdb(1).  By default, the core is written to the file
     "core.<pid>".  The process identifier, pid, must be given on the command
     line.

     The following options are available:

     -c      Write the core file to the specified file instead of
             "core.<pid>".

     -f      Dumps all available segments, excluding only malformed and
             undumpable segments.  Unlike the default invocation, this flag
             dumps mappings of devices which may invalidate the state of
             device transactions or trigger other unexpected behavior.  As a
             result, this flag should only be used when the behavior of the
             application and any devices it has mapped is fully understood and
             any side effects can be controlled or tolerated.

     -k      Use the ptrace(2) PT_COREDUMP kernel facility to write the core
             dump, instead of reading the process' memory and constructing the
             dump file in gcore itself.  This is faster, and the dump is
             written by the same kernel code that writes core dumps upon fatal
             signals.

FILES
     core.<pid>         the core image

HISTORY
     A gcore utility appeared in 4.2BSD.

BUGS
     Because of the ptrace(2) usage gcore may not work with processes which
     are actively being investigated with truss(1) or gdb(1).  Additionally,
     interruptable sleeps may exit with EINTR.

     The gcore utility is not compatible with the original 4.2BSD version.

FreeBSD 13.1-RELEASE-p6         April 24, 2021         FreeBSD 13.1-RELEASE-p6