From 584fd91d2d294883e6896dbd64a2176528e94581 Mon Sep 17 00:00:00 2001
From: Sebastian Falbesoner <sebastian.falbesoner@gmail.com>
Date: Mon, 22 Feb 2021 00:25:17 +0100
Subject: init: only use pipe2 if availabile, check in configure

---
 configure.ac     | 2 ++
 src/shutdown.cpp | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index c0e3b32e3b..426b184e5d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -925,6 +925,8 @@ AC_CHECK_DECLS([strnlen])
 dnl Check for daemon(3), unrelated to --with-daemon (although used by it)
 AC_CHECK_DECLS([daemon])
 
+AC_CHECK_DECLS([pipe2])
+
 AC_CHECK_DECLS([le16toh, le32toh, le64toh, htole16, htole32, htole64, be16toh, be32toh, be64toh, htobe16, htobe32, htobe64],,,
 		[#if HAVE_ENDIAN_H
                  #include <endian.h>
diff --git a/src/shutdown.cpp b/src/shutdown.cpp
index df5f996022..6a73e0b2d8 100644
--- a/src/shutdown.cpp
+++ b/src/shutdown.cpp
@@ -32,7 +32,7 @@ static int g_shutdown_pipe[2] = {-1, -1};
 bool InitShutdownState()
 {
 #ifndef WIN32
-#if HAVE_O_CLOEXEC
+#if HAVE_O_CLOEXEC && HAVE_DECL_PIPE2
     // If we can, make sure that the file descriptors are closed on exec()
     // to prevent interference.
     if (pipe2(g_shutdown_pipe, O_CLOEXEC) != 0) {
-- 
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