include/uapi/linux/udmabuf.h

File Facts

System

Linux kernel

Corpus path

include/uapi/linux/udmabuf.h

Extension

.h

Size

658 bytes

Lines

34

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.

• Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/types.h
• linux/ioctl.h

Detected Declarations

• struct udmabuf_create
• struct udmabuf_create_item
• struct udmabuf_create_list

Annotated Snippet

struct udmabuf_create {
	__u32 memfd;
	__u32 flags;
	__u64 offset;
	__u64 size;
};

struct udmabuf_create_item {
	__u32 memfd;
	__u32 __pad;
	__u64 offset;
	__u64 size;
};

struct udmabuf_create_list {
	__u32 flags;
	__u32 count;
	struct udmabuf_create_item list[];
};

#define UDMABUF_CREATE       _IOW('u', 0x42, struct udmabuf_create)
#define UDMABUF_CREATE_LIST  _IOW('u', 0x43, struct udmabuf_create_list)

#endif /* _UAPI_LINUX_UDMABUF_H */

Annotation

• Immediate include surface: `linux/types.h`, `linux/ioctl.h`.
• Detected declarations: `struct udmabuf_create`, `struct udmabuf_create_item`, `struct udmabuf_create_list`.
• Atlas domain: Core OS / Core Kernel Interface.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.