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# $OpenLDAP$
## This work is part of OpenLDAP Software <http://www.openldap.org/>.
##
## Copyright 2020-2022 The OpenLDAP Foundation.
## All rights reserved.
##
## Redistribution and use in source and binary forms, with or without
## modification, are permitted only as authorized by the OpenLDAP
## Public License.
##
## A copy of this license is available in the file LICENSE in the
## top-level directory of the distribution or, alternatively, at
## <http://www.OpenLDAP.org/license.html>.
"""
This GDB script sets up the debugger to run the program and see if it finishes
of its own accord or is terminated by a signal (like SIGABRT/SIGSEGV). In the
latter case, it saves a full backtrace and core file.
These signals are considered part of normal operation and will not trigger the
above handling:
- SIGPIPE: normal in a networked environment
- SIGHUP: normally used to tell a process to shut down
"""
import os
import os.path
import gdb
def format_program(inferior=None, thread=None):
"Format program name and p(t)id"
if thread:
inferior = thread.inferior
elif inferior is None:
inferior = gdb.selected_inferior()
try:
name = os.path.basename(inferior.progspace.filename)
except AttributeError: # inferior has died already
name = "unknown"
if thread:
pid = ".".join(tid for tid in thread.ptid if tid)
else:
pid = inferior.pid
return "{}.{}".format(name, pid)
def stop_handler(event):
"Inferior stopped on a signal, record core, backtrace and exit"
if not isinstance(event, gdb.SignalEvent):
# Ignore breakpoints
return
thread = event.inferior_thread
identifier = format_program(thread=thread)
prefix = os.path.expandvars("${TESTDIR}/") + identifier
if event.stop_signal == "SIGHUP":
# TODO: start a timer to catch shutdown issues/deadlocks
gdb.execute("continue")
return
gdb.execute('generate-core-file {}.core'.format(prefix))
with open(prefix + ".backtrace", "w") as bt_file:
backtrace = gdb.execute("thread apply all backtrace full",
to_string=True)
bt_file.write(backtrace)
gdb.execute("continue")
# We or we could allow the runner to disable randomisation
gdb.execute("set disable-randomization off")
gdb.execute("handle SIGPIPE noprint")
gdb.execute("handle SIGINT pass")
gdb.events.stop.connect(stop_handler)
gdb.execute("run")
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