random:w32: Don't emit message for diskperf when it's not useful.

* random/rndw32.c (slow_gatherer): Suppress emitting by log_info.

--

Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>

1 files changed, 9 insertions, 2 deletions

diff --git a/random/rndw32.c b/random/rndw32.c
index b3f63d20..ada7c5c0 100644
--- a/random/rndw32.c
+++ b/random/rndw32.c
@@ -624,8 +624,15 @@ slow_gatherer ( void (*add)(const void*, size_t, enum random_origins),
         }
       else
         {
-          log_info ("NOTE: you should run 'diskperf -y' "
-                    "to enable the disk statistics\n");
+          DWORD err_code = GetLastError ();
+
+          if (err_code == 0x32)
+            /* If it's ERROR_NOT_SUPPORTED, skip the message, as it
+               won't work.  */
+            ;
+          else
+            log_info ("NOTE: you should run 'diskperf -y' "
+                      "to enable the disk statistics\n");
         }
       CloseHandle (hDevice);
     }