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-rw-r--r--tests/cluster/cluster_test.go37
1 files changed, 37 insertions, 0 deletions
diff --git a/tests/cluster/cluster_test.go b/tests/cluster/cluster_test.go
index 2e969ce..def03f1 100644
--- a/tests/cluster/cluster_test.go
+++ b/tests/cluster/cluster_test.go
@@ -10,8 +10,11 @@ import (
"math/rand"
"os"
"sync"
+ "syscall"
"testing"
+ "golang.org/x/sys/unix"
+
"github.com/rfjakob/gocryptfs/v2/tests/test_helpers"
)
@@ -109,3 +112,37 @@ func TestClusterConcurrentRW(t *testing.T) {
go readThread(f2)
wg.Wait()
}
+
+// Check that byte-range locks work on an empty file
+func TestFcntlFlock(t *testing.T) {
+ path := test_helpers.TmpDir + "/" + t.Name()
+
+ fd1, err := syscall.Open(path, syscall.O_CREAT|syscall.O_WRONLY|syscall.O_EXCL, 0600)
+ if err != nil {
+ t.Fatal(err)
+ }
+ defer syscall.Close(fd1)
+
+ // F_OFD_SETLK locks on the same fd always succeed, so we have to
+ // open a 2nd time.
+ fd2, err := syscall.Open(path, syscall.O_RDWR, 0)
+ if err != nil {
+ t.Fatal(err)
+ }
+ defer syscall.Close(fd2)
+
+ lk := unix.Flock_t{
+ Type: unix.F_WRLCK,
+ Whence: unix.SEEK_SET,
+ Start: 0,
+ Len: 0,
+ }
+ err = unix.FcntlFlock(uintptr(fd1), unix.F_OFD_SETLK, &lk)
+ if err != nil {
+ t.Fatal(err)
+ }
+ err = unix.FcntlFlock(uintptr(fd2), unix.F_OFD_SETLK, &lk)
+ if err == nil {
+ t.Fatal("double-lock succeeded but should have failed")
+ }
+}