email.py 文件源码

def _invoke(self, cmdline):
        if sys.platform[:3] == 'win':
            closefds = False
            startupinfo = subprocess.STARTUPINFO()
            startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
        else:
            closefds = True
            startupinfo = None

        if (os.environ.get('DISPLAY') or sys.platform[:3] == 'win' or
                                                    sys.platform == 'darwin'):
            inout = file(os.devnull, 'r+')
        else:
            # for TTY programs, we need stdin/out
            inout = None

        # if possible, put the child precess in separate process group,
        # so keyboard interrupts don't affect child precess as well as
        # Python
        setsid = getattr(os, 'setsid', None)
        if not setsid:
            setsid = getattr(os, 'setpgrp', None)

        pipe = subprocess.Popen(cmdline, stdin=inout, stdout=inout,
                                stderr=inout, close_fds=closefds,
                                preexec_fn=setsid, startupinfo=startupinfo)

        # It is assumed that this kind of tools (gnome-open, kfmclient,
        # exo-open, xdg-open and open for OSX) immediately exit after lauching
        # the specific application
        returncode = pipe.wait()
        if hasattr(self, 'fixreturncode'):
            returncode = self.fixreturncode(returncode)
        return not returncode