tidy up some common code

lib/hcl-x.h

@@ -487,13 +487,24 @@ HCL_EXPORT int hcl_sys_send_iov (
 );
 
 HCL_EXPORT int hcl_sys_open_pipes (
-	int          pfd[2]
+	int          pfd[2],
+	int          nonblock
 );
 
 HCL_EXPORT void hcl_sys_close_pipes (
 	int          pfd[2]
 );
 
+HCL_EXPORT int hcl_sys_set_nonblock (
+	int          fd,
+	int          v
+);
+
+HCL_EXPORT int hcl_sys_set_cloexec (
+	int          fd,
+	int          v
+);
+
 #if defined(__cplusplus)
 }
 #endif