util: Add a wrapper around getuid()

So we can use it from JS in an upcoming commit.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/465

src/shell-util.c

@@ -638,6 +638,20 @@ shell_util_check_cloexec_fds (void)
   g_info ("Open fd CLOEXEC check complete");
 }
 
+/**
+ * shell_util_get_uid:
+ *
+ * A wrapper around getuid() so that it can be used from JavaScript. This
+ * function will always succeed.
+ *
+ * Returns: the real user ID of the calling process
+ */
+gint
+shell_util_get_uid (void)
+{
+  return getuid ();
+}
+
 static void
 on_systemd_call_cb (GObject      *source,
                     GAsyncResult *res,

src/shell-util.h

@@ -78,6 +78,8 @@ gboolean shell_util_has_x11_display_extension (MetaDisplay *display,
 
 char *shell_util_get_translated_folder_name (const char *name);
 
+gint shell_util_get_uid (void);
+
 G_END_DECLS
 
 #endif /* __SHELL_UTIL_H__ */