Method _posix_spawn

Lib/subprocess.py:1785–1823

Execute program using os.posix_spawn().

(self, args, executable, env, restore_signals, close_fds,
                         p2cread, p2cwrite,
                         c2pread, c2pwrite,
                         errread, errwrite)

        def _posix_spawn(self, args, executable, env, restore_signals, close_fds,
                         p2cread, p2cwrite,
                         c2pread, c2pwrite,
                         errread, errwrite):
            """Execute program using os.posix_spawn()."""
            kwargs = {}
            if restore_signals:
                # See _Py_RestoreSignals() in Python/pylifecycle.c
                sigset = []
                for signame in ('SIGPIPE', 'SIGXFZ', 'SIGXFSZ'):
                    signum = getattr(signal, signame, None)
                    if signum is not None:
                        sigset.append(signum)
                kwargs['setsigdef'] = sigset

            file_actions = []
            for fd in (p2cwrite, c2pread, errread):
                if fd != -1:
                    file_actions.append((os.POSIX_SPAWN_CLOSE, fd))
            for fd, fd2 in (
                (p2cread, 0),
                (c2pwrite, 1),
                (errwrite, 2),
            ):
                if fd != -1:
                    file_actions.append((os.POSIX_SPAWN_DUP2, fd, fd2))

            if close_fds:
                file_actions.append((os.POSIX_SPAWN_CLOSEFROM, 3))

            if file_actions:
                kwargs['file_actions'] = file_actions

            self.pid = os.posix_spawn(executable, args, env, **kwargs)
            self._child_created = True

            self._close_pipe_fds(p2cread, p2cwrite,
                                 c2pread, c2pwrite,
                                 errread, errwrite)

        def _execute_child(self, args, executable, preexec_fn, close_fds,
                           pass_fds, cwd, env,