1 files changed, 8 insertions, 8 deletions
diff --git a/src/ioutil_AdvertisedFiles.h b/src/ioutil_AdvertisedFiles.h
index ed937e1..ef4952b 100644
--- a/src/ioutil_AdvertisedFiles.h
+++ b/src/ioutil_AdvertisedFiles.h
@@ -28,11 +28,11 @@ extern "C"
      - an arbitrary additional description of the file contents */
 typedef struct
 {
-  char *thorn;
-  char *varname;
-  char *mimetype;
-  char *slice;
-  char *description;
+  const char *thorn;
+  const char *varname;
+  const char *mimetype;
+  const char *slice;
+  const char *description;
 } ioAdvertisedFileDesc;
 
 
@@ -42,19 +42,19 @@ typedef struct
    unadvertising, or notification when the contents of the file changed. */
 typedef struct
 {
-  int (*advertise) (cGH *GH,
+  int (*advertise) (const cGH *GH,
                     const char *filename,
                     const ioAdvertisedFileDesc *description);
 } ioAdvertisedFileListenerCallbacks;
 
 
 /* register a new listener with its own callbacks for file advertising */
-int IOUtil_RegisterAdvertisedFileListener (cGH *GH,
+int IOUtil_RegisterAdvertisedFileListener (const cGH *GH,
                                            const char *listener,
                            const ioAdvertisedFileListenerCallbacks *callbacks);
 
 /* advertise a file */
-int IOUtil_AdvertiseFile (cGH *GH,
+int IOUtil_AdvertiseFile (const cGH *GH,
                           const char *filename,
                           const ioAdvertisedFileDesc *desc);