Add compat mode for systems without openat(2)

1 files changed, 28 insertions, 0 deletions

diff --git a/Compat.h b/Compat.h
index e513b1d3..c8942735 100644
--- a/Compat.h
+++ b/Compat.h
@@ -7,7 +7,11 @@ Released under the GNU GPLv2, see the COPYING file
 in the source distribution for its full text.
 */
 
+#include "config.h" // IWYU pragma: keep
+
+#include <fcntl.h>
 #include <stddef.h>
+#include <unistd.h>
 #include <sys/stat.h>
 
 
@@ -22,6 +26,30 @@ int Compat_fstatat(int dirfd,
                    struct stat* statbuf,
                    int flags);
 
+#ifdef HAVE_OPENAT
+
+typedef int openat_arg_t;
+
+static inline void Compat_openatArgClose(openat_arg_t dirfd) {
+   close(dirfd);
+}
+
+static inline int Compat_openat(openat_arg_t dirfd, const char* pathname, int flags) {
+   return openat(dirfd, pathname, flags);
+}
+
+#else /* HAVE_OPENAT */
+
+typedef const char* openat_arg_t;
+
+static inline void Compat_openatArgClose(openat_arg_t dirpath) {
+   (void)dirpath;
+}
+
+int Compat_openat(openat_arg_t dirpath, const char* pathname, int flags);
+
+#endif /* HAVE_OPENAT */
+
 int Compat_readlinkat(int dirfd,
                    const char* dirpath,
                    const char* pathname,