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package hack
import (
"fmt"
"os"
"path/filepath"
"runtime"
"testing"
"time"
"golang.org/x/sys/unix"
"gotest.tools/v3/assert"
)
func openThisFile() (*os.File, error) {
_, file, _, ok := runtime.Caller(1)
if ok {
return os.Open(filepath.Base(file))
}
return nil, fmt.Errorf("unable to determine test filename")
}
func TestUnsetFileFinalizer(t *testing.T) {
// open the file and reset the finalizer
f, err := openThisFile()
assert.NilError(t, err)
fd := f.Fd()
// if something has changed in the os.File struct, this test will fail
// and the code in UnsetFileFinalizer will need to be updated
err = UnsetFileFinalizer(f)
assert.NilError(t, err)
// force garbage collection to run finalizer
runtime.GC()
time.Sleep(500 * time.Millisecond)
// check the file descriptor is still open
_, err = unix.FcntlInt(fd, unix.F_GETFL, 0)
assert.NilError(t, err)
assert.NilError(t, f.Close())
// open the file without resetting the finalizer
f, err = openThisFile()
assert.NilError(t, err)
fd = f.Fd()
runtime.GC()
// check the file descriptor is closed
for {
_, err = unix.FcntlInt(fd, unix.F_GETFL, 0)
if err == nil {
continue
}
assert.Error(t, err, "bad file descriptor")
break
}
}
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