include/uapi/linux/openat2.h

Source file repositories/reference/linux-study-clean/include/uapi/linux/openat2.h

File Facts

System
Linux kernel
Corpus path
include/uapi/linux/openat2.h
Extension
.h
Size
1729 bytes
Lines
51
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct open_how {
	__u64 flags;
	__u64 mode;
	__u64 resolve;
};

/*
 * how->flags bits exclusive to openat2(2). These live in the upper 32 bits
 * of @flags so that they cannot be expressed by open(2) / openat(2), whose
 * @flags argument is a C int.
 */
#define OPENAT2_REGULAR		((__u64)1 << 32) /* Only open regular files. */

/* 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 /* _UAPI_LINUX_OPENAT2_H */

Annotation

Implementation Notes