rt_sigprocmask   3019 kernel/signal.c SYSCALL_DEFINE4(rt_sigprocmask, int, how, sigset_t __user *, nset,
rt_sigprocmask   3050 kernel/signal.c COMPAT_SYSCALL_DEFINE4(rt_sigprocmask, int, how, compat_sigset_t __user *, nset,