From ccaa714a85dd7b73d2b144e59167f4fa086ab53a Mon Sep 17 00:00:00 2001
From: Otto van der Schaaf <oschaaf@we-amp.com>
Date: Mon, 27 Nov 2017 23:21:03 +0100
Subject: [PATCH] F_SETPIPE_SZ: check for existence before using (#1505)

Kernels before 2.6.35 do not have F_SETPIPE_SZ defined.

Fixes https://github.com/pagespeed/ngx_pagespeed/issues/1503
---
 src/ngx_event_connection.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/ngx_event_connection.cc b/src/ngx_event_connection.cc
index 1848f1b13..6ab88f9cd 100644
--- a/src/ngx_event_connection.cc
+++ b/src/ngx_event_connection.cc
@@ -57,7 +57,9 @@ bool NgxEventConnection::Init(ngx_cycle_t* cycle) {
     // See https://github.com/pagespeed/ngx_pagespeed/issues/1380
     // TODO(oschaaf): Consider implementing a queueing mechanism for retrying
     // failed writes.
+#ifdef F_SETPIPE_SZ
     fcntl(pipe_write_fd_, F_SETPIPE_SZ, 200*1024 /* minimal amount of bytes */);
+#endif
     return true;
   }
   close(file_descriptors[0]);