syscall_arg__val
val = syscall_arg__val(&arg, arg.idx);
val = syscall_arg__val(&arg, arg.idx);
unsigned long syscall_arg__val(struct syscall_arg *arg, u8 idx);
int cmd = syscall_arg__val(arg, 1);
int fd = syscall_arg__val(arg, 0);
int type = syscall_arg__val(arg, 2);
pid = syscall_arg__val(arg, arg->idx == 3 ? 0 : 1); /* idx1 -> pid1, idx2 -> pid2 */
int option = syscall_arg__val(arg, 0);
int option = syscall_arg__val(arg, 0);
int domain = syscall_arg__val(arg, 0);