public void TestAttachToGameFail_AnotherTracer()
{
string parentPid = "1234";
string tracerPid = "9876";
string tracerName = "gdb";
var launcherFactory = CreateLauncherFactory(false);
var launcher = launcherFactory.Create(_debugEngine, LaunchOption.AttachToGame, "",
_gameBinary, _gameBinary, _gameLaunch);
_debuggerFactory.SetTargetAttachError("Operation not permitted");
_platformFactory.AddCommandOutput($"cat /proc/{_pid}/status",
"Name:\tgame\n" + $"Pid:\t{_pid}\n" +
$"PPid:\t{parentPid}\n" +
$"TracerPid:\t{tracerPid}\n" + "FDSize:\t256\n");
_platformFactory.AddCommandOutput($"cat /proc/{tracerPid}/comm", tracerName);
AttachException e =
Assert.ThrowsAsync <AttachException>(async() => await LaunchAsync(launcher));
Assert.That(e.Message,
Is.EqualTo(
ErrorStrings
.FailedToAttachToProcessOtherTracer(tracerName, tracerPid)));
CheckLldbListenerStops();
}
/// <summary>
/// Get a more detailed error message if attaching to the remote process failed.
///
/// At the moment, we handle specially only the case when another tracer is attached.
/// In that case, we detect and show which process is the tracer.
/// </summary>
/// <param name="lldbError">Error object from Lldb attach.</param>
/// <param name="platform">Lldb platform, used to run shell commands.</param>
/// <param name="processId">Process Id of the debuggee.</param>
/// <returns>Returns the error string.</returns>
string GetLldbAttachErrorDetails(SbError lldbError, SbPlatform platform, uint processId)
{
string lldbMessageWhenAlreadyTraced = "Operation not permitted";
// Compute the fallback error message.
string errorString = ErrorStrings.FailedToAttachToProcess(lldbError.GetCString());
// If the error does not need special handling, just return the default message.
if (platform == null || lldbError.GetCString() != lldbMessageWhenAlreadyTraced)
{
return(errorString);
}
// Let us detect if there is a debugger already attached and provide a better error
// message there.
string output = RunShellCommand($"cat /proc/{processId}/status", platform);
if (string.IsNullOrEmpty(output))
{
return(errorString);
}
Regex tracerRE = new Regex("[\\r\\n]TracerPid:\\W*([0-9]+)[\\r\\n]");
Regex parentRE = new Regex("[\\r\\n]PPid:\\W*([0-9]+)[\\r\\n]");
Regex firstLineRE = new Regex("^([^\\r\\n]*)([\\r\\n]|$)");
// Find the line with tracer pid in the proc-status file.
Match tracerMatch = tracerRE.Match(output);
Match parentMatch = parentRE.Match(output);
if (!tracerMatch.Success || !parentMatch.Success)
{
return(errorString);
}
string parentPid = parentMatch.Groups[1].Value;
string tracerPid = tracerMatch.Groups[1].Value;
// If there was no tracer, just show the default message.
if (tracerPid == "0")
{
return(errorString);
}
// If the tracer is the parent process, then the debuggee is tracing itself.
if (tracerPid == parentPid)
{
return(ErrorStrings.FailedToAttachToProcessSelfTrace);
}
// Try to find the tracer in the list of processes and report it in the error message.
string commOutput = RunShellCommand($"cat /proc/{tracerPid}/comm", platform);
if (string.IsNullOrEmpty(output))
{
return(errorString);
}
// Get the first line as the process name.
Match commMatch = firstLineRE.Match(commOutput);
string tracerName = commMatch.Success ? commMatch.Groups[1].Value : "<unkown>";
return(ErrorStrings.FailedToAttachToProcessOtherTracer(tracerName, tracerPid));
}