I created an app to run with the sole purpose of crashing. I achieved this by calling NSAssert(NO,@"Force Crash") in the AppDelegate.
I then forked a copy of ios-sim and added my broken app as a launch argument.
I then executed the lldb next command.
As you can see since the error is nil exit(EXIT_FAILURE); is never called, and hence exit(EXIT_SUCCESS) is called.
I also ran ios-sim through this process_events.py script and here were the results.
#!/usr/bin/python
#----------------------------------------------------------------------
# Be sure to add the python path that points to the LLDB shared library.
# On MacOSX csh, tcsh:
# setenv PYTHONPATH /Applications/Xcode.app/Contents/SharedFrameworks/LLDB.framework/Resources/Python
# On MacOSX sh, bash:
# export PYTHONPATH=/Applications/Xcode.app/Contents/SharedFrameworks/LLDB.framework/Resources/Python
#----------------------------------------------------------------------
import commands
import optparse
import os
import platform
import sys
#----------------------------------------------------------------------
# Code that auto imports LLDB
#----------------------------------------------------------------------
try:
# Just try for LLDB in case PYTHONPATH is already correctly setup
import lldb
except ImportError:
lldb_python_dirs = list()
# lldb is not in the PYTHONPATH, try some defaults for the current platform
platform_system = platform.system()
if platform_system == 'Darwin':
# On Darwin, try the currently selected Xcode directory
xcode_dir = commands.getoutput("xcode-select --print-path")
if xcode_dir:
lldb_python_dirs.append(os.path.realpath(xcode_dir + '/../SharedFrameworks/LLDB.framework/Resources/Python'))
lldb_python_dirs.append(xcode_dir + '/Library/PrivateFrameworks/LLDB.framework/Resources/Python')
lldb_python_dirs.append('/System/Library/PrivateFrameworks/LLDB.framework/Resources/Python')
success = False
for lldb_python_dir in lldb_python_dirs:
if os.path.exists(lldb_python_dir):
if not (sys.path.__contains__(lldb_python_dir)):
sys.path.append(lldb_python_dir)
try:
import lldb
except ImportError:
pass
else:
print 'imported lldb from: "%s"' % (lldb_python_dir)
success = True
break
if not success:
print "error: couldn't locate the 'lldb' module, please set PYTHONPATH correctly"
sys.exit(1)
def print_threads(process, options):
if options.show_threads:
for thread in process:
print '%s %s' % (thread, thread.GetFrameAtIndex(0))
def run_commands(command_interpreter, commands):
return_obj = lldb.SBCommandReturnObject()
for command in commands:
command_interpreter.HandleCommand( command, return_obj )
if return_obj.Succeeded():
print return_obj.GetOutput()
else:
print return_obj
if options.stop_on_error:
break
def main(argv):
description='''Debugs a program using the LLDB python API and uses asynchronous broadcast events to watch for process state changes.'''
epilog='''Examples:
#----------------------------------------------------------------------
# Run "/bin/ls" with the arguments "-lAF /tmp/", and set a breakpoint
# at "malloc" and backtrace and read all registers each time we stop
#----------------------------------------------------------------------
% ./process_events.py --breakpoint malloc --stop-command bt --stop-command 'register read' -- /bin/ls -lAF /tmp/
'''
optparse.OptionParser.format_epilog = lambda self, formatter: self.epilog
parser = optparse.OptionParser(description=description, prog='process_events',usage='usage: process_events [options] program [arg1 arg2]', epilog=epilog)
parser.add_option('-v', '--verbose', action='store_true', dest='verbose', help="Enable verbose logging.", default=False)
parser.add_option('-b', '--breakpoint', action='append', type='string', metavar='BPEXPR', dest='breakpoints', help='Breakpoint commands to create after the target has been created, the values will be sent to the "_regexp-break" command which supports breakpoints by name, file:line, and address.')
parser.add_option('-a', '--arch', type='string', dest='arch', help='The architecture to use when creating the debug target.', default=None)
parser.add_option('--platform', type='string', metavar='platform', dest='platform', help='Specify the platform to use when creating the debug target. Valid values include "localhost", "darwin-kernel", "ios-simulator", "remote-freebsd", "remote-macosx", "remote-ios", "remote-linux".', default=None)
parser.add_option('-l', '--launch-command', action='append', type='string', metavar='CMD', dest='launch_commands', help='LLDB command interpreter commands to run once after the process has launched. This option can be specified more than once.', default=[])
parser.add_option('-s', '--stop-command', action='append', type='string', metavar='CMD', dest='stop_commands', help='LLDB command interpreter commands to run each time the process stops. This option can be specified more than once.', default=[])
parser.add_option('-c', '--crash-command', action='append', type='string', metavar='CMD', dest='crash_commands', help='LLDB command interpreter commands to run in case the process crashes. This option can be specified more than once.', default=[])
parser.add_option('-x', '--exit-command', action='append', type='string', metavar='CMD', dest='exit_commands', help='LLDB command interpreter commands to run once after the process has exited. This option can be specified more than once.', default=[])
parser.add_option('-T', '--no-threads', action='store_false', dest='show_threads', help="Don't show threads when process stops.", default=True)
parser.add_option('--ignore-errors', action='store_false', dest='stop_on_error', help="Don't stop executing LLDB commands if the command returns an error. This applies to all of the LLDB command interpreter commands that get run for launch, stop, crash and exit.", default=True)
parser.add_option('-n', '--run-count', type='int', dest='run_count', metavar='N', help='How many times to run the process in case the process exits.', default=1)
parser.add_option('-t', '--event-timeout', type='int', dest='event_timeout', metavar='SEC', help='Specify the timeout in seconds to wait for process state change events.', default=lldb.UINT32_MAX)
parser.add_option('-e', '--environment', action='append', type='string', metavar='ENV', dest='env_vars', help='Environment variables to set in the inferior process when launching a process.')
parser.add_option('-d', '--working-dir', type='string', metavar='DIR', dest='working_dir', help='The the current working directory when launching a process.', default=None)
parser.add_option('-p', '--attach-pid', type='int', dest='attach_pid', metavar='PID', help='Specify a process to attach to by process ID.', default=-1)
parser.add_option('-P', '--attach-name', type='string', dest='attach_name', metavar='PROCESSNAME', help='Specify a process to attach to by name.', default=None)
parser.add_option('-w', '--attach-wait', action='store_true', dest='attach_wait', help='Wait for the next process to launch when attaching to a process by name.', default=False)
try:
(options, args) = parser.parse_args(argv)
except:
return
attach_info = None
launch_info = None
exe = None
if args:
exe = args.pop(0)
launch_info = lldb.SBLaunchInfo (args)
if options.env_vars:
launch_info.SetEnvironmentEntries(options.env_vars, True)
if options.working_dir:
launch_info.SetWorkingDirectory(options.working_dir)
elif options.attach_pid != -1:
if options.run_count == 1:
attach_info = lldb.SBAttachInfo (options.attach_pid)
else:
print "error: --run-count can't be used with the --attach-pid option"
sys.exit(1)
elif not options.attach_name is None:
if options.run_count == 1:
attach_info = lldb.SBAttachInfo (options.attach_name, options.attach_wait)
else:
print "error: --run-count can't be used with the --attach-name option"
sys.exit(1)
else:
print 'error: a program path for a program to debug and its arguments are required'
sys.exit(1)
# Create a new debugger instance
debugger = lldb.SBDebugger.Create()
debugger.SetAsync (True)
command_interpreter = debugger.GetCommandInterpreter()
# Create a target from a file and arch
if exe:
print "Creating a target for '%s'" % exe
error = lldb.SBError()
target = debugger.CreateTarget (exe, options.arch, options.platform, True, error)
if target:
# Set any breakpoints that were specified in the args if we are launching. We use the
# command line command to take advantage of the shorthand breakpoint creation
if launch_info and options.breakpoints:
for bp in options.breakpoints:
debugger.HandleCommand( "_regexp-break %s" % (bp))
run_commands(command_interpreter, ['breakpoint list'])
for run_idx in range(options.run_count):
# Launch the process. Since we specified synchronous mode, we won't return
# from this function until we hit the breakpoint at main
error = lldb.SBError()
if launch_info:
if options.run_count == 1:
print 'Launching "%s"...' % (exe)
else:
print 'Launching "%s"... (launch %u of %u)' % (exe, run_idx + 1, options.run_count)
process = target.Launch (launch_info, error)
else:
if options.attach_pid != -1:
print 'Attaching to process %i...' % (options.attach_pid)
else:
if options.attach_wait:
print 'Waiting for next to process named "%s" to launch...' % (options.attach_name)
else:
print 'Attaching to existing process named "%s"...' % (options.attach_name)
process = target.Attach (attach_info, error)
# Make sure the launch went ok
if process and process.GetProcessID() != lldb.LLDB_INVALID_PROCESS_ID:
pid = process.GetProcessID()
listener = debugger.GetListener()
# sign up for process state change events
stop_idx = 0
done = False
while not done:
event = lldb.SBEvent()
if listener.WaitForEvent (options.event_timeout, event):
if lldb.SBProcess.EventIsProcessEvent(event):
state = lldb.SBProcess.GetStateFromEvent (event)
if state == lldb.eStateInvalid:
# Not a state event
print 'process event = %s' % (event)
else:
print "process state changed event: %s" % (lldb.SBDebugger.StateAsCString(state))
if state == lldb.eStateStopped:
if stop_idx == 0:
if launch_info:
print "process %u launched" % (pid)
run_commands(command_interpreter, ['breakpoint list'])
else:
print "attached to process %u" % (pid)
for m in target.modules:
print m
if options.breakpoints:
for bp in options.breakpoints:
debugger.HandleCommand( "_regexp-break %s" % (bp))
run_commands(command_interpreter, ['breakpoint list'])
run_commands (command_interpreter, options.launch_commands)
else:
if options.verbose:
print "process %u stopped" % (pid)
run_commands (command_interpreter, options.stop_commands)
stop_idx += 1
print_threads (process, options)
print "continuing process %u" % (pid)
process.Continue()
elif state == lldb.eStateExited:
exit_desc = process.GetExitDescription()
if exit_desc:
print "process %u exited with status %u: %s" % (pid, process.GetExitStatus (), exit_desc)
else:
print "process %u exited with status %u" % (pid, process.GetExitStatus ())
run_commands (command_interpreter, options.exit_commands)
done = True
elif state == lldb.eStateCrashed:
print "process %u crashed" % (pid)
print_threads (process, options)
run_commands (command_interpreter, options.crash_commands)
done = True
elif state == lldb.eStateDetached:
print "process %u detached" % (pid)
done = True
elif state == lldb.eStateRunning:
# process is running, don't say anything, we will always get one of these after resuming
if options.verbose:
print "process %u resumed" % (pid)
elif state == lldb.eStateUnloaded:
print "process %u unloaded, this shouldn't happen" % (pid)
done = True
elif state == lldb.eStateConnected:
print "process connected"
elif state == lldb.eStateAttaching:
print "process attaching"
elif state == lldb.eStateLaunching:
print "process launching"
else:
print 'event = %s' % (event)
else:
# timeout waiting for an event
print "no process event for %u seconds, killing the process..." % (options.event_timeout)
done = True
# Now that we are done dump the stdout and stderr
process_stdout = process.GetSTDOUT(1024)
if process_stdout:
print "Process STDOUT:\n%s" % (process_stdout)
while process_stdout:
process_stdout = process.GetSTDOUT(1024)
print process_stdout
process_stderr = process.GetSTDERR(1024)
if process_stderr:
print "Process STDERR:\n%s" % (process_stderr)
while process_stderr:
process_stderr = process.GetSTDERR(1024)
print process_stderr
process.Kill() # kill the process
else:
if error:
print error
else:
if launch_info:
print 'error: launch failed'
else:
print 'error: attach failed'
lldb.SBDebugger.Terminate()
if __name__ == '__main__':
main(sys.argv[1:])
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