RLIMIT_RTTIME
[RLIMIT_RTTIME] = {"Max realtime timeout", "us"},
[RLIMIT_RTTIME] = { RLIM_INFINITY, RLIM_INFINITY }, \
soft = task_rlimit(p, RLIMIT_RTTIME);
hard = task_rlimit_max(p, RLIMIT_RTTIME);
soft = task_rlimit(tsk, RLIMIT_RTTIME);
unsigned long hard = task_rlimit_max(tsk, RLIMIT_RTTIME);
tsk->signal->rlim[RLIMIT_RTTIME].rlim_cur = soft;