[glib] Skip the writable test if the file is not writable

[Matthias Clasen <matthiasc src gnome org>]

commit 0e55346420e74a562b42d14a136c07a4bbd9d955
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Apr 13 08:19:35 2011 -0400

    Skip the writable test if the file is not writable
    
    Since make distcheck operates on a readonly source tree.

 glib/tests/mappedfile.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)
---
diff --git a/glib/tests/mappedfile.c b/glib/tests/mappedfile.c
index 2678fd2..b9f2aa1 100644
--- a/glib/tests/mappedfile.c
+++ b/glib/tests/mappedfile.c
@@ -1,5 +1,9 @@
+#include <config.h>
 #include <glib.h>
 #include <string.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
 
 static void
 test_empty (void)
@@ -38,6 +42,12 @@ test_writable (void)
   const gchar *old = "MMMMMMMMMMMMMMMMMMMMMMMMM";
   const gchar *new = "abcdefghijklmnopqrstuvxyz";
 
+  if (access (SRCDIR "/4096-random-bytes", W_OK) != 0)
+    {
+      g_test_message ("Skipping writable mapping test");
+      return;
+    }
+
   error = NULL;
   file = g_mapped_file_new (SRCDIR "/4096-random-bytes", TRUE, &error);
   g_assert_no_error (error);