From 50e092a967e3e8baac75dd09f69ec2a94f70f889 Mon Sep 17 00:00:00 2001
From: Thomas Haller <thaller@redhat.com>
Date: Tue, 11 Sep 2018 16:06:25 +0200
Subject: [PATCH] build: add configure check for having memfd_create() API

---
 config.h.meson | 4 ++++
 configure.ac   | 6 ++++++
 meson.build    | 1 +
 3 files changed, 11 insertions(+)

diff --git a/config.h.meson b/config.h.meson
index e79f9dcb5..c8f980552 100644
--- a/config.h.meson
+++ b/config.h.meson
@@ -19,6 +19,10 @@
 /* Gettext package */
 #mesondefine GETTEXT_PACKAGE
 
+/* Define to 1 if you have the declaration of `memfd_create', and to 0 if you
+   don't. */
+#mesondefine HAVE_DECL_MEMFD_CREATE
+
 /* Define to 1 if you have the declaration of `reallocarray', and to 0 if
    you don't. */
 #mesondefine HAVE_DECL_REALLOCARRAY
diff --git a/configure.ac b/configure.ac
index 946f6b35e..aac2a3234 100644
--- a/configure.ac
+++ b/configure.ac
@@ -81,6 +81,12 @@ AC_CHECK_DECLS([
 #include <malloc.h>
 ]])
 
+AC_CHECK_DECLS([
+	memfd_create],
+	[], [], [[
+#include <sys/mman.h>
+]])
+
 AC_CHECK_HEADERS(sys/auxv.h)
 
 AC_CHECK_DECLS([getrandom],
diff --git a/meson.build b/meson.build
index c7c0bfc58..9bfc6bb3e 100644
--- a/meson.build
+++ b/meson.build
@@ -115,6 +115,7 @@ config_h.set('HAVE_SECURE_GETENV', cc.has_function('secure_getenv'))
 config_h.set('HAVE___SECURE_GETENV', cc.has_function('__secure_getenv'))
 config_h.set10('HAVE_DECL_REALLOCARRAY', cc.has_function('reallocarray', prefix: '#include <malloc.h>'))
 config_h.set10('HAVE_DECL_EXPLICIT_BZERO', cc.has_function('explicit_bzero', prefix: '#include <string.h>'))
+config_h.set10('HAVE_DECL_MEMFD_CREATE', cc.has_function('memfd_create', prefix: '#include <sys/mman.h>'))
 
 # types
 config_h.set('SIZEOF_DEV_T', cc.sizeof('dev_t', prefix: '#include <sys/types.h>'))