From e33593d30d9dee6fd6b0e7c0d01832e478815d88 Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher
Date: Sun, 3 Dec 2017 17:53:14 +0100
Subject: syscallcompat: add Fstatat + emulation + test

Fstatat has recently been added to x/sys/unix. Make
it available for use in gocryptfs.
---
 internal/syscallcompat/emulate.go | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

(limited to 'internal/syscallcompat/emulate.go')

diff --git a/internal/syscallcompat/emulate.go b/internal/syscallcompat/emulate.go
index 96776e2..e5aeae7 100644
--- a/internal/syscallcompat/emulate.go
+++ b/internal/syscallcompat/emulate.go
@@ -210,3 +210,23 @@ func emulateMkdirat(dirfd int, path string, mode uint32) (err error) {
 	}
 	return syscall.Mkdir(path, mode)
 }
+
+// emulateFstatat emulates the syscall for platforms that don't have it
+// in the kernel (darwin).
+func emulateFstatat(dirfd int, path string, stat *unix.Stat_t, flags int) (err error) {
+	if !filepath.IsAbs(path) {
+		chdirMutex.Lock()
+		defer chdirMutex.Unlock()
+		cwd, err := syscall.Open(".", syscall.O_RDONLY, 0)
+		if err != nil {
+			return err
+		}
+		defer syscall.Close(cwd)
+		err = syscall.Fchdir(dirfd)
+		if err != nil {
+			return err
+		}
+		defer syscall.Fchdir(cwd)
+	}
+	return unix.Lstat(path, stat)
+}
-- 
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