1 files changed, 24 insertions, 0 deletions
diff --git a/libsbutil/sb_exists.c b/libsbutil/sb_exists.c
new file mode 100644
index 0000000..c2171fe
--- /dev/null
+++ b/libsbutil/sb_exists.c
@@ -0,0 +1,24 @@
+/*
+ * Copyright 2023 Gentoo Authors
+ * Distributed under the terms of the GNU General Public License v2
+ */
+
+#include "headers.h"
+#include "sbutil.h"
+
+/* Wrapper for faccessat to work around buggy behavior on musl */
+int sb_exists(int dirfd, const char *pathname, int flags)
+{
+	struct stat64 buf;
+
+	if (sbio_faccessat(dirfd, pathname, F_OK, flags|AT_EACCESS) == 0)
+		return 0;
+
+	/* musl's faccessat gives EINVAL when the kernel does not support
+	 * faccessat2 and AT_SYMLINK_NOFOLLOW is set.
+	 * https://www.openwall.com/lists/musl/2023/06/19/1 */
+	if (errno != EINVAL)
+		return -1;
+
+	return fstatat64(dirfd, pathname, &buf, flags);
+}