xref: /llvm-project/lldb/test/API/functionalities/process_group/TestChangeProcessGroup.py (revision 80fcecb13c388ff087a27a4b0e7ca3dd8c98eaa4) 
1"""Test that we handle inferiors which change their process group"""
2
3
4import os
5import lldb
6from lldbsuite.test.decorators import *
7from lldbsuite.test.lldbtest import *
8from lldbsuite.test import lldbutil
9
10
11class ChangeProcessGroupTestCase(TestBase):
12    NO_DEBUG_INFO_TESTCASE = True
13
14    def setUp(self):
15        # Call super's setUp().
16        TestBase.setUp(self)
17        # Find the line number to break for main.c.
18        self.line = line_number("main.c", "// Set breakpoint here")
19
20    @skipIfFreeBSD  # Times out on FreeBSD llvm.org/pr23731
21    @skipIfWindows  # setpgid call does not exist on Windows
22    @expectedFailureAndroid("http://llvm.org/pr23762", api_levels=[16])
23    @expectedFailureNetBSD
24    @skipIftvOS  # fork not available on tvOS.
25    @skipIfwatchOS  # fork not available on watchOS.
26    def test_setpgid(self):
27        self.build()
28        exe = self.getBuildArtifact("a.out")
29
30        # Use a file as a synchronization point between test and inferior.
31        pid_file_path = lldbutil.append_to_process_working_directory(
32            self, "pid_file_%d" % (int(time.time()))
33        )
34        self.addTearDownHook(
35            lambda: self.run_platform_command("rm %s" % (pid_file_path))
36        )
37
38        popen = self.spawnSubprocess(exe, [pid_file_path])
39
40        pid = lldbutil.wait_for_file_on_target(self, pid_file_path)
41
42        # make sure we cleanup the forked child also
43        def cleanupChild():
44            if lldb.remote_platform:
45                lldb.remote_platform.Kill(int(pid))
46            else:
47                if os.path.exists("/proc/" + pid):
48                    os.kill(int(pid), signal.SIGKILL)
49
50        self.addTearDownHook(cleanupChild)
51
52        # Create a target by the debugger.
53        target = self.dbg.CreateTarget(exe)
54        self.assertTrue(target, VALID_TARGET)
55
56        listener = lldb.SBListener("my.attach.listener")
57        error = lldb.SBError()
58        process = target.AttachToProcessWithID(listener, int(pid), error)
59        self.assertTrue(error.Success() and process, PROCESS_IS_VALID)
60
61        # set a breakpoint just before the setpgid() call
62        lldbutil.run_break_set_by_file_and_line(
63            self, "main.c", self.line, num_expected_locations=-1
64        )
65
66        thread = process.GetSelectedThread()
67
68        # release the child from its loop
69        value = thread.GetSelectedFrame().EvaluateExpression("release_child_flag = 1")
70        self.assertTrue(value.IsValid())
71        self.assertEqual(value.GetValueAsUnsigned(0), 1)
72        process.Continue()
73
74        # make sure the child's process group id is different from its pid
75        value = thread.GetSelectedFrame().EvaluateExpression("(int)getpgid(0)")
76        self.assertTrue(value.IsValid())
77        self.assertNotEqual(value.GetValueAsUnsigned(0), int(pid))
78
79        # step over the setpgid() call
80        thread.StepOver()
81        self.assertStopReason(thread.GetStopReason(), lldb.eStopReasonPlanComplete)
82
83        # verify that the process group has been set correctly
84        # this also checks that we are still in full control of the child
85        value = thread.GetSelectedFrame().EvaluateExpression("(int)getpgid(0)")
86        self.assertTrue(value.IsValid())
87        self.assertEqual(value.GetValueAsUnsigned(0), int(pid))
88
89        # run to completion
90        process.Continue()
91        self.assertState(process.GetState(), lldb.eStateExited)
92