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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package runtime_test
import (
. "runtime"
"syscall"
"testing"
"time"
"unsafe"
)
var pid, tid int
func init() {
// Record pid and tid of init thread for use during test.
// The call to LockOSThread is just to exercise it;
// we can't test that it does anything.
// Instead we're testing that the conditions are good
// for how it is used in init (must be on main thread).
pid, tid = syscall.Getpid(), syscall.Gettid()
LockOSThread()
sysNanosleep = func(d time.Duration) {
// Invoke a blocking syscall directly; calling time.Sleep()
// would deschedule the goroutine instead.
ts := syscall.NsecToTimespec(d.Nanoseconds())
for {
if err := syscall.Nanosleep(&ts, &ts); err != syscall.EINTR {
return
}
}
}
}
func TestLockOSThread(t *testing.T) {
if pid != tid {
t.Fatalf("pid=%d but tid=%d", pid, tid)
}
}
// Test that error values are negative.
// Use a misaligned pointer to get -EINVAL.
func TestMincoreErrorSign(t *testing.T) {
var dst byte
v := Mincore(unsafe.Add(unsafe.Pointer(new(int32)), 1), 1, &dst)
const EINVAL = 0x16
if v != -EINVAL {
t.Errorf("mincore = %v, want %v", v, -EINVAL)
}
}
func TestKernelStructSize(t *testing.T) {
// Check that the Go definitions of structures exchanged with the kernel are
// the same size as what the kernel defines.
if have, want := unsafe.Sizeof(Siginfo{}), uintptr(SiginfoMaxSize); have != want {
t.Errorf("Go's siginfo struct is %d bytes long; kernel expects %d", have, want)
}
if have, want := unsafe.Sizeof(Sigevent{}), uintptr(SigeventMaxSize); have != want {
t.Errorf("Go's sigevent struct is %d bytes long; kernel expects %d", have, want)
}
}