From 3f4e1e7274993b32b4dab8bdabdc9b645993923c Mon Sep 17 00:00:00 2001
From: Yichao Yu <yyc1992@gmail.com>
Date: Wed, 15 Jun 2016 21:28:48 -0400
Subject: [PATCH] Check if O_CLOEXEC exists before using.

---
 src/cgmemmgr.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/cgmemmgr.cpp b/src/cgmemmgr.cpp
index d5850b2265013..b0e0c3d79eea6 100644
--- a/src/cgmemmgr.cpp
+++ b/src/cgmemmgr.cpp
@@ -260,9 +260,16 @@ static int self_mem_fd = -1;
 
 static int init_self_mem()
 {
+#ifdef O_CLOEXEC
     int fd = open("/proc/self/mem", O_RDWR | O_SYNC | O_CLOEXEC);
     if (fd == -1)
         return -1;
+#else
+    int fd = open("/proc/self/mem", O_RDWR | O_SYNC);
+    if (fd == -1)
+        return -1;
+    fcntl(fd, F_SETFD, FD_CLOEXEC);
+#endif
     // buffer to check if write works;
     volatile uint64_t buff = 0;
     uint64_t v = 0x12345678;