sys_signalfd4    2155 fs/compat.c    	return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
sys_signalfd4     265 fs/signalfd.c  	return sys_signalfd4(ufd, user_mask, sizemask, 0);
sys_signalfd4     616 include/linux/syscalls.h asmlinkage long sys_signalfd4(int ufd, sigset_t __user *user_mask, size_t sizemask, int flags);