Add build system scaffolding and libc headers

1 files changed, 49 insertions, 0 deletions

diff --git a/include/arch/x86_64/linux/openat2.h b/include/arch/x86_64/linux/openat2.h
new file mode 100644
index 00000000..5041a70e
--- /dev/null
+++ b/include/arch/x86_64/linux/openat2.h
@@ -0,0 +1,49 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _LINUX_OPENAT2_H
+#define _LINUX_OPENAT2_H
+
+#include <linux/types.h>
+
+/*
+ * Arguments for how openat2(2) should open the target path. If only @flags and
+ * @mode are non-zero, then openat2(2) operates very similarly to openat(2).
+ *
+ * However, unlike openat(2), unknown or invalid bits in @flags result in
+ * -EINVAL rather than being silently ignored. @mode must be zero unless one of
+ * {O_CREAT, O_TMPFILE} are set.
+ *
+ * @flags: O_* flags.
+ * @mode: O_CREAT/O_TMPFILE file mode.
+ * @resolve: RESOLVE_* flags.
+ */
+struct open_how {
+	__u64 flags;
+	__u64 mode;
+	__u64 resolve;
+};
+
+/* how->resolve flags for openat2(2). */
+#define RESOLVE_NO_XDEV                     \
+	0x01 /* Block mount-point crossings \
+		(includes bind-mounts). */
+#define RESOLVE_NO_MAGICLINKS                        \
+	0x02 /* Block traversal through procfs-style \
+		"magic-links". */
+#define RESOLVE_NO_SYMLINKS                          \
+	0x04 /* Block traversal through all symlinks \
+		(implies OEXT_NO_MAGICLINKS) */
+#define RESOLVE_BENEATH                       \
+	0x08 /* Block "lexical" trickery like \
+		"..", symlinks, and absolute  \
+		paths which escape the dirfd. */
+#define RESOLVE_IN_ROOT                        \
+	0x10 /* Make all jumps to "/" and ".." \
+		be scoped inside the dirfd     \
+		(similar to chroot(2)). */
+#define RESOLVE_CACHED                               \
+	0x20 /* Only complete if resolution can be   \
+		completed through cached lookup. May \
+		return -EAGAIN if that's not         \
+		possible. */
+
+#endif /* _LINUX_OPENAT2_H */