1388 			   pid_t tracee, int status, void *args);
1390 void start_tracer(struct __test_metadata *_metadata, int fd, pid_t tracee,  in start_tracer()  argument
1404 		ret = ptrace(PTRACE_ATTACH, tracee, NULL, 0);  in start_tracer()
1406 		kill(tracee, SIGKILL);  in start_tracer()
1411 	ret = ptrace(PTRACE_SETOPTIONS, tracee, NULL, ptrace_syscall ?  in start_tracer()
1416 		kill(tracee, SIGKILL);  in start_tracer()
1419 		     tracee, NULL, 0);  in start_tracer()
1430 		if (wait(&status) != tracee)  in start_tracer()
1439 		tracer_func(_metadata, tracee, status, args);  in start_tracer()
1442 			     tracee, NULL, 0);  in start_tracer()
1458 	pid_t tracee = getpid();  in setup_trace_fixture()  local
1469 		start_tracer(_metadata, pipefd[1], tracee, func, args,  in setup_trace_fixture()
1501 void tracer_poke(struct __test_metadata *_metadata, pid_t tracee, int status,  in tracer_poke()  argument
1508 	ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg);  in tracer_poke()
1512 		kill(tracee, SIGKILL);  in tracer_poke()
1519 	ret = ptrace(PTRACE_POKEDATA, tracee, info->poke_addr, 0x1001);  in tracer_poke()
1659 int get_syscall(struct __test_metadata *_metadata, pid_t tracee)  in get_syscall()  argument
1663 	EXPECT_EQ(0, ptrace(PTRACE_GETREGS, tracee, 0, &regs)) {  in get_syscall()
1672 	EXPECT_EQ(0, ptrace(PTRACE_GETREGSET, tracee, NT_PRSTATUS, &iov)) {  in get_syscall()
1687 		    pid_t tracee, int syscall, int result)  in change_syscall()  argument
1692 	ret = ptrace(PTRACE_GETREGS, tracee, 0, &regs);  in change_syscall()
1697 	ret = ptrace(PTRACE_GETREGSET, tracee, NT_PRSTATUS, &iov);  in change_syscall()
1719 		ret = ptrace(PTRACE_SET_SYSCALL, tracee, NULL, syscall);  in change_syscall()
1730 		ret = ptrace(PTRACE_SETREGSET, tracee, NT_ARM_SYSTEM_CALL,  in change_syscall()
1750 	ret = ptrace(PTRACE_SETREGS, tracee, 0, &regs);  in change_syscall()
1754 	ret = ptrace(PTRACE_SETREGSET, tracee, NT_PRSTATUS, &iov);  in change_syscall()
1759 void tracer_syscall(struct __test_metadata *_metadata, pid_t tracee,  in tracer_syscall()  argument
1766 	ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg);  in tracer_syscall()
1773 		EXPECT_EQ(__NR_getpid, get_syscall(_metadata, tracee));  in tracer_syscall()
1774 		change_syscall(_metadata, tracee, __NR_getppid, 0);  in tracer_syscall()
1778 		EXPECT_EQ(__NR_gettid, get_syscall(_metadata, tracee));  in tracer_syscall()
1779 		change_syscall(_metadata, tracee, -1, 45000);  in tracer_syscall()
1783 		EXPECT_EQ(__NR_openat, get_syscall(_metadata, tracee));  in tracer_syscall()
1784 		change_syscall(_metadata, tracee, -1, -ESRCH);  in tracer_syscall()
1788 		EXPECT_EQ(__NR_getppid, get_syscall(_metadata, tracee));  in tracer_syscall()
1793 			kill(tracee, SIGKILL);  in tracer_syscall()
1799 void tracer_ptrace(struct __test_metadata *_metadata, pid_t tracee,  in tracer_ptrace()  argument
1813 	ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg);  in tracer_ptrace()
1821 	nr = get_syscall(_metadata, tracee);  in tracer_ptrace()
1824 		change_syscall(_metadata, tracee, __NR_getppid, 0);  in tracer_ptrace()
1826 		change_syscall(_metadata, tracee, -1, 45000);  in tracer_ptrace()
1828 		change_syscall(_metadata, tracee, -1, -ESRCH);  in tracer_ptrace()