fdio: Add glnx_file_replace_contents_at()

Sort of similar to `g_file_replace_contents()` but `*at()`.  Will be
used for further conversion of OSTree to `*at()`.

1 files changed, 22 insertions, 0 deletions

diff --git a/glnx-fdio.h b/glnx-fdio.h
index 47368df..a380c1f 100644
--- a/glnx-fdio.h
+++ b/glnx-fdio.h
@@ -63,6 +63,28 @@ glnx_file_get_contents_utf8_at (int                   dfd,
                                 GCancellable         *cancellable,
                                 GError              **error);
 
+/**
+ * GLnxFileReplaceFlags:
+ * @GLNX_FILE_REPLACE_DATASYNC_NEW: Call fdatasync() even if the file did not exist
+ * @GLNX_FILE_REPLACE_NODATASYNC: Never call fdatasync()
+ *
+ * Flags controlling file replacement.
+ */
+typedef enum {
+  GLNX_FILE_REPLACE_DATASYNC_NEW = (1 << 0),
+  GLNX_FILE_REPLACE_NODATASYNC = (1 << 1),
+} GLnxFileReplaceFlags;
+
+gboolean
+glnx_file_replace_contents_at (int                   dfd,
+                               const char           *subpath,
+                               const guint8         *buf,
+                               gsize                 len,
+                               int                   mode,
+                               GLnxFileReplaceFlags  flags,
+                               GCancellable         *cancellable,
+                               GError              **error);
+
 char *
 glnx_readlinkat_malloc (int            dfd,
                         const char    *subpath,