asmlinkage int sys_vfork(long r10, long r11, long r12, long r13,
long mof, long srp, struct pt_regs *regs);
asmlinkage int sys_pipe(unsigned long __user *fildes);
-asmlinkage int sys_ptrace(long request, long pid, long addr, long data);
struct sigaction;
asmlinkage long sys_rt_sigaction(int sig,
const struct sigaction __user *act,