1 files changed, 57 insertions, 0 deletions
diff --git a/sysdeps/mach/msync.c b/sysdeps/mach/msync.c
new file mode 100644
index 0000000000..cf62960b4f
--- /dev/null
+++ b/sysdeps/mach/msync.c
@@ -0,0 +1,57 @@
+/* msync -- Synchronize mapped memory to external storage.  Mach version.
+   Copyright (C) 2002 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <errno.h>
+#include <mach.h>
+
+/* Some Mach variants have vm_msync and some don't.  Those that have it
+   define the VM_SYNC_* bits when we include <mach/mach_types.h>.  */
+
+#ifndef VM_SYNC_SYNCHRONOUS
+# include <sysdeps/generic/msync.c>
+#else
+
+/* Synchronize the region starting at ADDR and extending LEN bytes with the
+   file it maps.  Filesystem operations on a file being mapped are
+   unpredictable before this is done.  */
+
+int
+msync (__ptr_t addr, size_t len, int flags)
+{
+  vm_sync_t sync_flags = 0;
+  kern_return_t err;
+
+  if (flags & MS_SYNC)
+    sync_flags |= VM_SYNC_SYNCHRONOUS;
+  if (flags & MS_ASYNC)
+    sync_flags |= VM_SYNC_ASYNCHRONOUS;
+  if (flags & MS_INVALIDATE)
+    sync_flags |= VM_SYNC_INVALIDATE;
+
+  if (err = __vm_msync (__mach_task_self (),
+			(vm_address_t) addr, (vm_size_t) len, sync_flags))
+    {
+      errno = err;
+      return -1;
+    }
+  return 0;
+}
+#endif