From bcbb2e8649fb36bb1e38449506fbb4411e5d3847 Mon Sep 17 00:00:00 2001
From: Tatsuhiro Tsujikawa <tatsuhiro.t@gmail.com>
Date: Wed, 8 Oct 2014 23:44:38 +0900
Subject: [PATCH] src: Use fcntl and FD_CLOEXEC if O_CLOEXEC is undefined

We may run into race condition if execve is called at the same time
when fcntl is called.  But we just does this for now to compile
nghttp2 applications under older kernel.
---
 src/util.cc | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/src/util.cc b/src/util.cc
index 14a7ed07..9fa93326 100644
--- a/src/util.cc
+++ b/src/util.cc
@@ -539,10 +539,21 @@ int reopen_log_file(const char *path)
     fd = open(path, O_WRONLY | O_APPEND | O_CREAT | O_CLOEXEC,
               S_IRUSR | S_IWUSR | S_IRGRP);
   }
-#else // !__ANDROID__ && !ANDROID
+#elif defined O_CLOEXEC
+
   auto fd = open(path, O_WRONLY | O_APPEND | O_CREAT | O_CLOEXEC,
                  S_IRUSR | S_IWUSR | S_IRGRP);
-#endif // !__ANDROID__ && !ANDROID
+#else // !O_CLOEXEC
+
+  auto fd = open(path, O_WRONLY | O_APPEND | O_CREAT,
+                 S_IRUSR | S_IWUSR | S_IRGRP);
+
+  // We get race condition if execve is called at the same time.
+  if(fd != -1) {
+    fcntl(fd, F_SETFD, FD_CLOEXEC);
+  }
+
+#endif // !O_CLOEXEC
 
   if(fd == -1) {
     return -1;