android_dev_diag_monitor.py 文件源码

def _mkfifo(self, fifo_path):
        try:
            if os.path.exists(fifo_path):
                # self._run_shell_cmd("rm %s " % fifo_path, wait=True)
                os.remove(fifo_path)
            os.mknod(fifo_path, 0o666 | stat.S_IFIFO)
        except OSError as err:
            if err.errno == errno.EEXIST:   # if already exists, skip this step
                pass
                # print "Fifo file already exists, skipping..."
            elif err.errno == errno.EPERM:  # not permitted, try shell command
                # print "Not permitted to create fifo file, try to switch to
                # root..."
                retcode = self._run_shell_cmd(
                    "mknod %s p" %
                    fifo_path, wait=True)
                if retcode != 0:
                    raise RuntimeError("mknod returns %s" % str(retcode))
            else:
                raise err