1// Copyright 2012 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5package runtime_test
6
7import (
8	. "runtime"
9	"syscall"
10	"testing"
11	"time"
12	"unsafe"
13)
14
15var pid, tid int
16
17func init() {
18	// Record pid and tid of init thread for use during test.
19	// The call to LockOSThread is just to exercise it;
20	// we can't test that it does anything.
21	// Instead we're testing that the conditions are good
22	// for how it is used in init (must be on main thread).
23	pid, tid = syscall.Getpid(), syscall.Gettid()
24	LockOSThread()
25
26	sysNanosleep = func(d time.Duration) {
27		// Invoke a blocking syscall directly; calling time.Sleep()
28		// would deschedule the goroutine instead.
29		ts := syscall.NsecToTimespec(d.Nanoseconds())
30		for {
31			if err := syscall.Nanosleep(&ts, &ts); err != syscall.EINTR {
32				return
33			}
34		}
35	}
36}
37
38func TestLockOSThread(t *testing.T) {
39	if pid != tid {
40		t.Fatalf("pid=%d but tid=%d", pid, tid)
41	}
42}
43
44// Test that error values are negative.
45// Use a misaligned pointer to get -EINVAL.
46func TestMincoreErrorSign(t *testing.T) {
47	var dst byte
48	v := Mincore(unsafe.Add(unsafe.Pointer(new(int32)), 1), 1, &dst)
49
50	const EINVAL = 0x16
51	if v != -EINVAL {
52		t.Errorf("mincore = %v, want %v", v, -EINVAL)
53	}
54}
55
56func TestKernelStructSize(t *testing.T) {
57	// Check that the Go definitions of structures exchanged with the kernel are
58	// the same size as what the kernel defines.
59	if have, want := unsafe.Sizeof(Siginfo{}), uintptr(SiginfoMaxSize); have != want {
60		t.Errorf("Go's siginfo struct is %d bytes long; kernel expects %d", have, want)
61	}
62	if have, want := unsafe.Sizeof(Sigevent{}), uintptr(SigeventMaxSize); have != want {
63		t.Errorf("Go's sigevent struct is %d bytes long; kernel expects %d", have, want)
64	}
65}
66