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"""Test that we handle inferiors that send signals to themselves"""
from __future__ import print_function
import os
import lldb
from lldbsuite.test.lldbtest import *
import lldbsuite.test.lldbutil as lldbutil
import re
@skipIfWindows # signals do not exist on Windows
class RaiseTestCase(TestBase):
mydir = TestBase.compute_mydir(__file__)
def test_sigstop(self):
self.build()
self.signal_test('SIGSTOP', False)
# passing of SIGSTOP is not correctly handled, so not testing that scenario: https://llvm.org/bugs/show_bug.cgi?id=23574
@skipIfDarwin # darwin does not support real time signals
@skipIfTargetAndroid()
def test_sigsigrtmin(self):
self.build()
self.signal_test('SIGRTMIN', True)
def launch(self, target, signal):
# launch the process, do not stop at entry point.
process = target.LaunchSimple([signal], None, self.get_process_working_directory())
self.assertTrue(process, PROCESS_IS_VALID)
self.assertEqual(process.GetState(), lldb.eStateStopped)
thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonBreakpoint)
self.assertTrue(thread.IsValid(), "Thread should be stopped due to a breakpoint")
return process
def set_handle(self, signal, pass_signal, stop_at_signal, notify_signal):
return_obj = lldb.SBCommandReturnObject()
self.dbg.GetCommandInterpreter().HandleCommand(
"process handle %s -p %s -s %s -n %s" % (signal, pass_signal, stop_at_signal, notify_signal),
return_obj)
self.assertTrue (return_obj.Succeeded() == True, "Setting signal handling failed")
def signal_test(self, signal, test_passing):
"""Test that we handle inferior raising signals"""
exe = os.path.join(os.getcwd(), "a.out")
# Create a target by the debugger.
target = self.dbg.CreateTarget(exe)
self.assertTrue(target, VALID_TARGET)
lldbutil.run_break_set_by_symbol(self, "main")
# launch
process = self.launch(target, signal)
signo = process.GetUnixSignals().GetSignalNumberFromName(signal)
# retrieve default signal disposition
return_obj = lldb.SBCommandReturnObject()
self.dbg.GetCommandInterpreter().HandleCommand("process handle %s " % signal, return_obj)
match = re.match('NAME *PASS *STOP *NOTIFY.*(false|true) *(false|true) *(false|true)',
return_obj.GetOutput(), re.IGNORECASE | re.DOTALL)
if not match:
self.fail('Unable to retrieve default signal disposition.')
default_pass = match.group(1)
default_stop = match.group(2)
default_notify = match.group(3)
# Make sure we stop at the signal
self.set_handle(signal, "false", "true", "true")
process.Continue()
self.assertEqual(process.GetState(), lldb.eStateStopped)
thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonSignal)
self.assertTrue(thread.IsValid(), "Thread should be stopped due to a signal")
self.assertTrue(thread.GetStopReasonDataCount() >= 1, "There was data in the event.")
self.assertEqual(thread.GetStopReasonDataAtIndex(0), signo,
"The stop signal was %s" % signal)
# Continue until we exit.
process.Continue()
self.assertEqual(process.GetState(), lldb.eStateExited)
self.assertEqual(process.GetExitStatus(), 0)
# launch again
process = self.launch(target, signal)
# Make sure we do not stop at the signal. We should still get the notification.
self.set_handle(signal, "false", "false", "true")
self.expect("process continue", substrs=["stopped and restarted", signal])
self.assertEqual(process.GetState(), lldb.eStateExited)
self.assertEqual(process.GetExitStatus(), 0)
# launch again
process = self.launch(target, signal)
# Make sure we do not stop at the signal, and we do not get the notification.
self.set_handle(signal, "false", "false", "false")
self.expect("process continue", substrs=["stopped and restarted"], matching=False)
self.assertEqual(process.GetState(), lldb.eStateExited)
self.assertEqual(process.GetExitStatus(), 0)
if not test_passing:
# reset signal handling to default
self.set_handle(signal, default_pass, default_stop, default_notify)
return
# launch again
process = self.launch(target, signal)
# Make sure we stop at the signal
self.set_handle(signal, "true", "true", "true")
process.Continue()
self.assertEqual(process.GetState(), lldb.eStateStopped)
thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonSignal)
self.assertTrue(thread.IsValid(), "Thread should be stopped due to a signal")
self.assertTrue(thread.GetStopReasonDataCount() >= 1, "There was data in the event.")
self.assertEqual(thread.GetStopReasonDataAtIndex(0),
process.GetUnixSignals().GetSignalNumberFromName(signal),
"The stop signal was %s" % signal)
# Continue until we exit. The process should receive the signal.
process.Continue()
self.assertEqual(process.GetState(), lldb.eStateExited)
self.assertEqual(process.GetExitStatus(), signo)
# launch again
process = self.launch(target, signal)
# Make sure we do not stop at the signal. We should still get the notification. Process
# should receive the signal.
self.set_handle(signal, "true", "false", "true")
self.expect("process continue", substrs=["stopped and restarted", signal])
self.assertEqual(process.GetState(), lldb.eStateExited)
self.assertEqual(process.GetExitStatus(), signo)
# launch again
process = self.launch(target, signal)
# Make sure we do not stop at the signal, and we do not get the notification. Process
# should receive the signal.
self.set_handle(signal, "true", "false", "false")
self.expect("process continue", substrs=["stopped and restarted"], matching=False)
self.assertEqual(process.GetState(), lldb.eStateExited)
self.assertEqual(process.GetExitStatus(), signo)
# reset signal handling to default
self.set_handle(signal, default_pass, default_stop, default_notify)
@expectedFailureLinux("llvm.org/pr24530") # the signal the inferior generates gets lost
@expectedFailureDarwin("llvm.org/pr24530") # the signal the inferior generates gets lost
def test_restart_bug(self):
"""Test that we catch a signal in the edge case where the process receives it while we are
about to interrupt it"""
self.build()
exe = os.path.join(os.getcwd(), "a.out")
# Create a target by the debugger.
target = self.dbg.CreateTarget(exe)
self.assertTrue(target, VALID_TARGET)
bkpt = target.BreakpointCreateByName("main")
self.assertTrue(bkpt.IsValid(), VALID_BREAKPOINT)
# launch the inferior and don't wait for it to stop
self.dbg.SetAsync(True)
error = lldb.SBError()
listener = lldb.SBListener("my listener")
process = target.Launch (listener,
["SIGSTOP"], # argv
None, # envp
None, # stdin_path
None, # stdout_path
None, # stderr_path
None, # working directory
0, # launch flags
False, # Stop at entry
error) # error
self.assertTrue(process and process.IsValid(), PROCESS_IS_VALID)
event = lldb.SBEvent()
# Give the child enough time to reach the breakpoint,
# while clearing out all the pending events.
# The last WaitForEvent call will time out after 2 seconds.
while listener.WaitForEvent(2, event):
if self.TraceOn():
print("Process changing state to:", self.dbg.StateAsCString(process.GetStateFromEvent(event)))
# now the process should be stopped
self.assertEqual(process.GetState(), lldb.eStateStopped, PROCESS_STOPPED)
self.assertEqual(len(lldbutil.get_threads_stopped_at_breakpoint(process, bkpt)), 1,
"A thread should be stopped at breakpoint")
# Remove all breakpoints. This makes sure we don't have to single-step over them when we
# resume the process below
target.DeleteAllBreakpoints()
# resume the process and immediately try to set another breakpoint. When using the remote
# stub, this will trigger a request to stop the process just as it is about to stop
# naturally due to a SIGSTOP signal it raises. Make sure we do not lose this signal.
process.Continue()
self.assertTrue(target.BreakpointCreateByName("handler").IsValid(), VALID_BREAKPOINT)
# Clear the events again
while listener.WaitForEvent(2, event):
if self.TraceOn():
print("Process changing state to:", self.dbg.StateAsCString(process.GetStateFromEvent(event)))
# The process should be stopped due to a signal
self.assertEqual(process.GetState(), lldb.eStateStopped)
thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonSignal)
self.assertTrue(thread.IsValid(), "Thread should be stopped due to a signal")
self.assertTrue(thread.GetStopReasonDataCount() >= 1, "There was data in the event.")
signo = process.GetUnixSignals().GetSignalNumberFromName("SIGSTOP")
self.assertEqual(thread.GetStopReasonDataAtIndex(0), signo,
"The stop signal was %s" % signal)
# We are done
process.Kill()
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