macos: fix O_DIRECT build failure

O_DIRECT has no direct equivalent on MacOS
(check out https://github.com/libuv/libuv/issues/1600 for details).

Just define it to zero there.

2 files changed, 8 insertions, 0 deletions

diff --git a/internal/syscallcompat/sys_darwin.go b/internal/syscallcompat/sys_darwin.go
index 7f2c541..74681db 100644
--- a/internal/syscallcompat/sys_darwin.go
+++ b/internal/syscallcompat/sys_darwin.go
@@ -9,6 +9,10 @@ import (
 	"github.com/hanwen/go-fuse/fuse"
 )
 
+// O_DIRECT means oncached I/O on Linux. No direct equivalent on MacOS and defined
+// to zero there.
+const O_DIRECT = 0
+
 // 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.
diff --git a/internal/syscallcompat/sys_linux.go b/internal/syscallcompat/sys_linux.go
index b5b949e..b6f18d2 100644
--- a/internal/syscallcompat/sys_linux.go
+++ b/internal/syscallcompat/sys_linux.go
@@ -14,6 +14,10 @@ import (
 
 const _FALLOC_FL_KEEP_SIZE = 0x01
 
+// O_DIRECT means oncached I/O on Linux. No direct equivalent on MacOS and defined
+// to zero there.
+const O_DIRECT = syscall.O_DIRECT
+
 var preallocWarn sync.Once
 
 // EnospcPrealloc preallocates ciphertext space without changing the file