fix signal.SIGHUP is not available on Windows

Author: rhysd

covimerage/cli.py

@@ -149,10 +149,12 @@ def run(ctx, args, wrap_profile, profile_file, write_data, data_file,
     try:
         proc = subprocess.Popen(cmd)
 
-        def forward_signals(signalnum, stackframe):
-            """Forward SIGHUP to the subprocess."""
-            proc.send_signal(signalnum)
-        signal.signal(signal.SIGHUP, forward_signals)
+        # signal.SIGHUP does not exist on Windows
+        if hasattr(signal, 'SIGHUP'):
+            def forward_signals(signalnum, stackframe):
+                """Forward SIGHUP to the subprocess."""
+                proc.send_signal(signalnum)
+            signal.signal(signal.SIGHUP, forward_signals)
 
         try:
             exit_code = proc.wait()

tests/test_cli.py

@@ -773,6 +773,7 @@ def test_run_report_without_data(tmpdir, runner, devnull):
     assert result.exit_code == 1
 
 
+@pytest.mark.skipif(sys.platform == 'win32', reason='SIGHUP is not available on Windows')
 def test_run_forwards_sighup(devnull):
     proc = subprocess.Popen([
             sys.executable, '-m', 'covimerage', 'run',