sys_signalfd4     500 include/linux/syscalls.h asmlinkage long sys_signalfd4(int ufd, sigset_t __user *user_mask, size_t sizemask, int flags);
sys_signalfd4     236 include/uapi/asm-generic/unistd.h __SC_COMP(__NR_signalfd4, sys_signalfd4, compat_sys_signalfd4)
sys_signalfd4     236 tools/include/uapi/asm-generic/unistd.h __SC_COMP(__NR_signalfd4, sys_signalfd4, compat_sys_signalfd4)