syscallcompat: move syscall wrapper to their own package

We will get more of them as OSX also lacks support for openat.

1 files changed, 12 insertions, 0 deletions

diff --git a/internal/syscallcompat/sys_darwin.go b/internal/syscallcompat/sys_darwin.go
new file mode 100644
index 0000000..d437170
--- /dev/null
+++ b/internal/syscallcompat/sys_darwin.go
@@ -0,0 +1,12 @@
+package syscallcompat
+
+// prealloc - preallocate space without changing the file size. This prevents
+// us from running out of space in the middle of an operation.
+func Prealloc(fd int, off int64, len int64) (err error) {
+	//
+	// Sorry, fallocate is not available on OSX at all and
+	// fcntl F_PREALLOCATE is not accessible from Go.
+	//
+	// See https://github.com/rfjakob/gocryptfs/issues/18 if you want to help.
+	return nil
+}