unix_events.py 文件源码

def _start(self, args, shell, stdin, stdout, stderr, bufsize, **kwargs):
        stdin_w = None
        if stdin == subprocess.PIPE:
            # Use a socket pair for stdin, since not all platforms
            # support selecting read events on the write end of a
            # socket (which we use in order to detect closing of the
            # other end).  Notably this is needed on AIX, and works
            # just fine on other platforms.
            stdin, stdin_w = self._loop._socketpair()

            # Mark the write end of the stdin pipe as non-inheritable,
            # needed by close_fds=False on Python 3.3 and older
            # (Python 3.4 implements the PEP 446, socketpair returns
            # non-inheritable sockets)
            _set_inheritable(stdin_w.fileno(), False)
        self._proc = subprocess.Popen(
            args, shell=shell, stdin=stdin, stdout=stdout, stderr=stderr,
            universal_newlines=False, bufsize=bufsize, **kwargs)
        if stdin_w is not None:
            stdin.close()
            self._proc.stdin = open(stdin_w.detach(), 'wb', buffering=bufsize)