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unix: add FcntlFstore on darwin

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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>
This commit is contained in:
Tobias Klauser
2020-09-18 12:13:43 +02:00
committed by Tobias Klauser
parent efd3b9a0ff
commit af09f7315a
2 changed files with 39 additions and 1 deletions
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6
unix/fcntl_darwin.go
View File

@@ -16,3 +16,9 @@ func FcntlFlock(fd uintptr, cmd int, lk *Flock_t) error {
_, err := fcntl(int(fd), cmd, int(uintptr(unsafe.Pointer(lk))))
return err
}
// FcntlFstore performs a fcntl syscall for the F_PREALLOCATE command.
func FcntlFstore(fd uintptr, cmd int, fstore *Fstore_t) error {
_, err := fcntl(int(fd), cmd, int(uintptr(unsafe.Pointer(fstore))))
return err
}

34
unix/syscall_darwin_test.go
View File

@@ -31,7 +31,7 @@ func stringsFromByteSlice(buf []byte) []string {
}
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 @@ func TestFclonefileat(t *testing.T) {
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)
}
}