rumpclient_prefork
if ((rf = rumpclient_prefork()) == NULL)
struct rumpclient_fork *rumpclient_prefork(void);
if (!(rf = rumpclient_prefork()))
if ((rf = rumpclient_prefork()) == NULL)
if ((rf = rumpclient_prefork()) == NULL)
if ((rf = rumpclient_prefork()) == NULL)
if ((rf = rumpclient_prefork()) == NULL)