Method test_setsid

Lib/test/test_os/test_posix.py:2052–2081

(self)

                                                    signal.NSIG+1])

    def test_setsid(self):
        rfd, wfd = os.pipe()
        self.addCleanup(os.close, rfd)
        try:
            os.set_inheritable(wfd, True)

            code = textwrap.dedent(f"""
                import os
                fd = {wfd}
                sid = os.getsid(0)
                os.write(fd, str(sid).encode())
            """)

            try:
                pid = self.spawn_func(sys.executable,
                                      [sys.executable, "-c", code],
                                      os.environ, setsid=True)
            except NotImplementedError as exc:
                self.skipTest(f"setsid is not supported: {exc!r}")
            except PermissionError as exc:
                self.skipTest(f"setsid failed with: {exc!r}")
        finally:
            os.close(wfd)

        support.wait_process(pid, exitcode=0)

        output = os.read(rfd, 100)
        child_sid = int(output)
        parent_sid = os.getsid(os.getpid())
        self.assertNotEqual(parent_sid, child_sid)

    @unittest.skipUnless(hasattr(signal, 'pthread_sigmask'),
                         'need signal.pthread_sigmask()')