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"""Test that we are able to evaluate expressions when the inferior is blocked in a syscall"""
from __future__ import print_function
import os
import lldb
from lldbsuite.test.lldbtest import *
import lldbsuite.test.lldbutil as lldbutil
class ExprSyscallTestCase(TestBase):
mydir = TestBase.compute_mydir(__file__)
@expectedFailureWindows("llvm.org/pr21765") # Also getpid() is not a function on Windows anyway
def test_setpgid(self):
self.build()
self.expr_syscall()
def expr_syscall(self):
exe = os.path.join(os.getcwd(), 'a.out')
# Create a target by the debugger.
target = self.dbg.CreateTarget(exe)
self.assertTrue(target, VALID_TARGET)
listener = lldb.SBListener("my listener")
# launch the inferior and don't wait for it to stop
self.dbg.SetAsync(True)
error = lldb.SBError()
process = target.Launch (listener,
None, # 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 syscall,
# while clearing out all the pending events.
# The last WaitForEvent call will time out after 2 seconds.
while listener.WaitForEvent(2, event):
pass
# now the process should be running (blocked in the syscall)
self.assertEqual(process.GetState(), lldb.eStateRunning, "Process is running")
# send the process a signal
process.SendAsyncInterrupt()
while listener.WaitForEvent(2, event):
pass
# as a result the process should stop
# in all likelihood we have stopped in the middle of the sleep() syscall
self.assertEqual(process.GetState(), lldb.eStateStopped, PROCESS_STOPPED)
thread = process.GetSelectedThread()
# try evaluating a couple of expressions in this state
self.expect("expr release_flag = 1", substrs = [" = 1"])
self.expect("print (int)getpid()", substrs = [str(process.GetProcessID())])
# and run the process to completion
process.Continue()
# process all events
while listener.WaitForEvent(10, event):
new_state = lldb.SBProcess.GetStateFromEvent(event)
if new_state == lldb.eStateExited:
break
self.assertEqual(process.GetState(), lldb.eStateExited)
self.assertEqual(process.GetExitStatus(), 0)
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