unsigned long fd, unsigned long pgoff);
asmlinkage int sys_execve(char *name, char **argv, char **envp);
asmlinkage int sys_pipe(unsigned long *fildes);
-asmlinkage int sys_ptrace(long request, long pid, long addr, long data);
struct pt_regs;
struct sigaction;
asmlinkage long sys_rt_sigaction(int sig,