/usr/bin/gcore is in gdb-minimal 7.7-0ubuntu3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 | #!/bin/sh
# Copyright (C) 2003-2014 Free Software Foundation, Inc.
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# Script to generate a core file of a running program.
# It starts up gdb, attaches to the given PID and invokes the gcore command.
#
if [ "$#" -eq "0" ]
then
echo "usage: gcore [-o filename] pid"
exit 2
fi
# Need to check for -o option, but set default basename to "core".
name=core
if [ "$1" = "-o" ]
then
if [ "$#" -lt "3" ]
then
# Not enough arguments.
echo "usage: gcore [-o filename] pid"
exit 2
fi
name=$2
# Shift over to start of pid list
shift; shift
fi
# Attempt to fetch the absolute path to the gcore script that was
# called.
binary_path=`dirname "$0"`
if test "x$binary_path" = x. ; then
# We got "." back as a path. This means the user executed
# the gcore script locally (i.e. ./gcore) or called the
# script via a shell interpreter (i.e. sh gcore).
binary_basename=`basename "$0"`
# If the gcore script was called like "sh gcore" and the script
# lives in the current directory, "which" will not give us "gcore".
# So first we check if the script is in the current directory
# before using the output of "which".
if test -f "$binary_basename" ; then
# We have a local gcore script in ".". This covers the case of
# doing "./gcore" or "sh gcore".
binary_path="."
else
# The gcore script was not found in ".", which means the script
# was called from somewhere else in $PATH by "sh gcore".
# Extract the correct path now.
binary_path_from_env=`which "$0"`
binary_path=`dirname "$binary_path_from_env"`
fi
fi
# Check if the GDB binary is in the expected path. If not, just
# quit with a message.
if [ ! -f "$binary_path"/gdb ]; then
echo "gcore: GDB binary (${binary_path}/gdb) not found"
exit 1
fi
# Initialise return code.
rc=0
# Loop through pids
for pid in $*
do
# `</dev/null' to avoid touching interactive terminal if it is
# available but not accessible as GDB would get stopped on SIGTTIN.
$binary_path/gdb </dev/null --nx --batch \
-ex "set pagination off" -ex "set height 0" -ex "set width 0" \
-ex "attach $pid" -ex "gcore $name.$pid" -ex detach -ex quit
if [ -r $name.$pid ] ; then
rc=0
else
echo "gcore: failed to create $name.$pid"
rc=1
break
fi
done
exit $rc
|