Only use fdatasync() on Linux

This function is not universally available, and since we don't have our
own autoconf script to check for it, just assume that we have it iff
we're on Linux.

1 files changed, 10 insertions, 4 deletions

diff --git a/gsystem-file-utils.c b/gsystem-file-utils.c
index 639caca..c758a1f 100644
--- a/gsystem-file-utils.c
+++ b/gsystem-file-utils.c
@@ -277,8 +277,8 @@ gs_file_map_readonly (GFile         *file,
  * @cancellable:
  * @error:
  *
- * Wraps the UNIX fdatasync() function, which ensures that the data in
- * @file is on non-volatile storage.
+ * Wraps the UNIX fsync() function (or fdatasync(), if available), which
+ * ensures that the data in @file is on non-volatile storage.
  */
 gboolean
 gs_file_sync_data (GFile          *file,
@@ -294,7 +294,13 @@ gs_file_sync_data (GFile          *file,
     goto out;
 
   do
-    res = fdatasync (fd);
+    {
+#ifdef __linux
+      res = fdatasync (fd);
+#else
+      res = fsync (fd);
+#endif
+    }
   while (G_UNLIKELY (res != 0 && errno == EINTR));
   if (res != 0)
     {
@@ -619,7 +625,7 @@ linkcopy_internal_attempt (GFile          *src,
       
   if (sync_data)
     {
-      /* Now, we need to fdatasync */
+      /* Now, we need to fsync */
       if (!gs_file_sync_data (tmp_dest, cancellable, error))
         goto out;
     }