1 files changed, 11 insertions, 0 deletions
diff --git a/winsup/cygwin/miscfuncs.cc b/winsup/cygwin/miscfuncs.cc
index 26686bd2b..474843a19 100644
--- a/winsup/cygwin/miscfuncs.cc
+++ b/winsup/cygwin/miscfuncs.cc
@@ -361,3 +361,14 @@ create_pipe (PHANDLE hr,PHANDLE hw, LPSECURITY_ATTRIBUTES sa, DWORD n)
       break;
   return false;
 }
+
+#undef FlushFileBuffers
+bool
+flush_file_buffers (HANDLE h)
+{
+  DWORD ftype = GetFileType (h);
+  /* Per MSDN, FlushFileBuffers on named pipes might block.  This is the last
+     we want it to do, especially when printing debug output  as when calling
+     system_printf. */
+  return (ftype != FILE_TYPE_PIPE) ? FlushFileBuffers (h) : true;
+}