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# -*- cperl -*-
# Copyright (C) 2004-2006 MySQL AB
#
# 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; version 2 of the License.
#
# 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, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
package My::CoreDump;
use strict;
use Carp;
use My::Platform;
use File::Temp qw/ tempfile tempdir /;
sub _gdb {
my ($core_name)= @_;
print "\nTrying 'gdb' to get a backtrace\n";
return unless -f $core_name;
# Find out name of binary that generated core
`gdb -c '$core_name' --batch 2>&1` =~
/Core was generated by `([^\s\'\`]+)/;
my $binary= $1 or return;
print "Core generated by '$binary'\n";
# Create tempfile containing gdb commands
my ($tmp, $tmp_name) = tempfile();
print $tmp
"bt\n",
"thread apply all bt\n",
"quit\n";
close $tmp or die "Error closing $tmp_name: $!";
# Run gdb
my $gdb_output=
`gdb '$binary' -c '$core_name' -x '$tmp_name' --batch 2>&1`;
unlink $tmp_name or die "Error removing $tmp_name: $!";
return if $? >> 8;
return unless $gdb_output;
print <<EOF, $gdb_output, "\n";
Output from gdb follows. The first stack trace is from the failing thread.
The following stack traces are from all threads (so the failing one is
duplicated).
--------------------------
EOF
return 1;
}
sub _dbx {
my ($core_name)= @_;
print "\nTrying 'dbx' to get a backtrace\n";
return unless -f $core_name;
# Find out name of binary that generated core
`echo | dbx - '$core_name' 2>&1` =~
/Corefile specified executable: "([^"]+)"/;
my $binary= $1 or return;
print "Core generated by '$binary'\n";
# Find all threads
my @thr_ids = `echo threads | dbx '$binary' '$core_name' 2>&1` =~ /t@\d+/g;
# Create tempfile containing dbx commands
my ($tmp, $tmp_name) = tempfile();
foreach my $thread (@thr_ids) {
print $tmp "where $thread\n";
}
print $tmp "exit\n";
close $tmp or die "Error closing $tmp_name: $!";
# Run dbx
my $dbx_output=
`cat '$tmp_name' | dbx '$binary' '$core_name' 2>&1`;
unlink $tmp_name or die "Error removing $tmp_name: $!";
return if $? >> 8;
return unless $dbx_output;
print <<EOF, $dbx_output, "\n";
Output from dbx follows. Stack trace is printed for all threads in order,
above this you should see info about which thread was the failing one.
----------------------------
EOF
return 1;
}
sub show {
my ($class, $core_name)= @_;
# We try dbx first; gdb itself may coredump if run on a Sun Studio
# compiled binary on Solaris.
my @debuggers =
(
\&_dbx,
\&_gdb,
# TODO...
);
# Try debuggers until one succeeds
foreach my $debugger (@debuggers){
if ($debugger->($core_name)){
return;
}
}
return;
}
1;
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