Implement restore_signals.

gevent/subprocess.py

@@ -1009,6 +1009,14 @@ class Popen(object):
                                     except:
                                         pass
 
+                            if restore_signals:
+                                # restore the documented signals back to sig_dfl;
+                                # not all will be defined on every platform
+                                for sig in 'SIGPIPE', 'SIGXFZ', 'SIGXFSZ':
+                                    sig = getattr(signal, sig, None)
+                                    if sig is not None:
+                                        signal.signal(sig, signal.SIG_DFL)
+
                             if env is None:
                                 os.execvp(executable, args)
                             else:

greentest/patched_tests_setup.py

@@ -218,9 +218,6 @@ if sys.version_info[:2] >= (3, 4):
         # Our monkey patch waits for the process with a watcher and so detects
         # the exit before the normal polling mechanism would
 
-        'test_subprocess.POSIXProcessTestCase.test_restore_signals',
-        # XXX: We don't implement the restore_signals option yet
-
         'test_subprocess.POSIXProcessTestCase.test_start_new_session',
         # XXX: We don't implement the start_new_session option yet