From fb60d7ef8d91cac45b51609cb22d0ecf31f225fd Mon Sep 17 00:00:00 2001
From: Emil Renner Berthing <systemd@esmil.dk>
Date: Thu, 18 Sep 2014 15:24:48 +0200
Subject: [PATCH 17/31] shared/missing.h: check for missing
 canonicalize_file_name

---
 configure.ac        | 3 ++-
 src/basic/missing.h | 6 ++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 8ff9b97..423dab1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -306,8 +306,9 @@ AC_SUBST(CAP_LIBS)
 
 AC_CHECK_FUNCS([memfd_create])
 AC_CHECK_FUNCS([__secure_getenv secure_getenv])
-AC_CHECK_DECLS([gettid, pivot_root, name_to_handle_at, setns, getrandom, renameat2, kcmp, LO_FLAGS_PARTSCAN],
+AC_CHECK_DECLS([gettid, pivot_root, canonicalize_file_name, name_to_handle_at, setns, getrandom, renameat2, kcmp, LO_FLAGS_PARTSCAN],
                [], [], [[
+#include <stdlib.h>
 #include <sys/types.h>
 #include <unistd.h>
 #include <sys/mount.h>
diff --git a/src/basic/missing.h b/src/basic/missing.h
index dc1f244..aaf017a 100644
--- a/src/basic/missing.h
+++ b/src/basic/missing.h
@@ -132,6 +132,12 @@ static inline int pivot_root(const char *new_root, const char *put_old) {
 }
 #endif
 
+#if !HAVE_DECL_CANONICALIZE_FILE_NAME
+static inline char *canonicalize_file_name(const char *path) {
+        return realpath(path, NULL);
+}
+#endif
+
 #ifndef __NR_memfd_create
 #  if defined __x86_64__
 #    define __NR_memfd_create 319
-- 
2.5.2