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package cluster
// poc_test.go contains proof of concept tests for the byte-range locking logic.
// This goes directly to an underlying filesystem without going through gocryptfs.
import (
"syscall"
"testing"
"golang.org/x/sys/unix"
"github.com/rfjakob/gocryptfs/v2/tests/test_helpers"
)
// Check that byte-range locks work on an empty file
func TestPoCFcntlFlock(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")
}
}
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