unix: add FcntlFstore on darwin
This allows to perform a fcntl syscall with the F_PREALLOCATE command.
See man fcntl(2) on macOS for details.
Change-Id: I21f95b91269513064859425ab7adc42a73d6adb5
Reviewed-on: https://go-review.googlesource.com/c/sys/+/255917
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
diff --git a/unix/syscall_darwin_test.go b/unix/syscall_darwin_test.go
index e7f6bdd..d9f1013 100644
--- a/unix/syscall_darwin_test.go
+++ b/unix/syscall_darwin_test.go
@@ -31,7 +31,7 @@
}
func createTestFile(t *testing.T, dir string) (f *os.File, cleanup func() error) {
- file, err := ioutil.TempFile(dir, "TestClonefile")
+ file, err := ioutil.TempFile(dir, t.Name())
if err != nil {
t.Fatal(err)
}
@@ -185,3 +185,35 @@
t.Errorf("Fclonefileat: got %q, expected %q", clonedData, testData)
}
}
+
+func TestFcntlFstore(t *testing.T) {
+ f, err := ioutil.TempFile("", t.Name())
+ if err != nil {
+ t.Fatal(err)
+ }
+ defer os.Remove(f.Name())
+ defer f.Close()
+
+ fstore := &unix.Fstore_t{
+ Flags: unix.F_ALLOCATEALL,
+ Posmode: unix.F_PEOFPOSMODE,
+ Offset: 0,
+ Length: 1 << 10,
+ }
+ err = unix.FcntlFstore(f.Fd(), unix.F_PREALLOCATE, fstore)
+ if err == unix.EOPNOTSUPP {
+ t.Skipf("fcntl with F_PREALLOCATE not supported, skipping test")
+ } else if err != nil {
+ t.Fatalf("FcntlFstore: %v", err)
+ }
+
+ st, err := f.Stat()
+ if err != nil {
+ t.Fatal(err)
+ }
+
+ if st.Size() != 0 {
+ t.Errorf("FcntlFstore: got size = %d, want %d", st.Size(), 0)
+ }
+
+}
