2 files changed, 16 insertions, 10 deletions
diff --git a/Changes b/Changes
index b85c71a..d882029 100644
--- a/Changes
+++ b/Changes
@@ -30,4 +30,5 @@ TODO: openbsd requites stdint.h for intptr_t - why posix?
         - "fix" demo.c so that it works as non-root.
         - suppoert utimes seperately from futimes, as some systems have
           utimes but not futimes.
+        - use _POSIX_MEMLOCK_RANGE for mlock.
 
diff --git a/eio.c b/eio.c
index 4963fc1..862b5ad 100644
--- a/eio.c
+++ b/eio.c
@@ -81,7 +81,7 @@
 # include <signal.h>
 # include <dirent.h>
 
-#if _POSIX_MEMLOCK || _POSIX_MAPPED_FILES
+#if _POSIX_MEMLOCK || _POSIX_MEMLOCK_RANGE || _POSIX_MAPPED_FILES
 # include <sys/mman.h>
 #endif
 
@@ -1433,19 +1433,10 @@ eio_page_align (void **addr, size_t *length)
 }
 
 #if !_POSIX_MEMLOCK
-# define eio__mlock(a,b) ((errno = ENOSYS), -1)
 # define eio__mlockall(a) ((errno = ENOSYS), -1)
 #else
 
 static int
-eio__mlock (void *addr, size_t length)
-{
-  eio_page_align (&addr, &length);
-
-  return mlock (addr, length);
-}
-
-static int
 eio__mlockall (int flags)
 {
   #if __GLIBC__ == 2 && __GLIBC_MINOR__ <= 7
@@ -1465,6 +1456,20 @@ eio__mlockall (int flags)
 }
 #endif
 
+#if !_POSIX_MEMLOCK_RANGE
+# define eio__mlock(a,b) ((errno = ENOSYS), -1)
+#else
+
+static int
+eio__mlock (void *addr, size_t length)
+{
+  eio_page_align (&addr, &length);
+
+  return mlock (addr, length);
+}
+
+#endif
+
 #if !(_POSIX_MAPPED_FILES && _POSIX_SYNCHRONIZED_IO)
 # define eio__msync(a,b,c) ((errno = ENOSYS), -1)
 #else