public void ProcessWithActiveHandle()
{
using (var cleaner = new TestFileCleaner())
{
const int MAX_TRIES = 10;
// It is tricky to get an open handle conflict- give it a few tries
for (int i = 0; i < MAX_TRIES; i++)
{
string testFile = cleaner.CreateTestFile(nameof(ProcessWithActiveHandle));
// Create an open handle on the test file. Note that this must come first as
// the redirect (>>) will refuse to execute if there is already an open handle.
Process process = null;
ProcessStartInfo startInfo = new ProcessStartInfo
{
FileName = "cmd",
Arguments = $"/K copy con >> {testFile}",
WindowStyle = ProcessWindowStyle.Hidden
};
try
{
process = Process.Start(startInfo);
// The existing cmd handle won't let us access much
using (var handle = FileMethods.CreateFile(testFile, CreationDisposition.OpenExisting,
DesiredAccess.ReadAttributes, ShareModes.ReadWrite | ShareModes.Delete))
{
var ids = FileMethods.GetProcessIds(handle);
if (ids.Count() == 0)
{
continue;
}
// If this ends up being problematic (i.e. antivirus gets us a count of 2)
// we can look to see we have an id that matches the known process and that we
// don't contain our own process id.
ids.Should().HaveCount(1);
((int)(ulong)ids.First()).Should().Be(process.Id);
return;
}
}
finally
{
process?.CloseMainWindow();
}
}
false.Should().BeTrue($"Did not get a locked file in {MAX_TRIES} tries.");
}
}
