asmlinkage int sys_pipe(unsigned long r4, unsigned long r5,
unsigned long r6, unsigned long r7,
struct pt_regs regs);
-asmlinkage int sys_ptrace(long request, long pid, long addr, long data);
asmlinkage ssize_t sys_pread_wrapper(unsigned int fd, char *buf,
size_t count, long dummy, loff_t pos);
asmlinkage ssize_t sys_pwrite_wrapper(unsigned int fd, const char *buf,