arch/s390/include/uapi/asm/ipcbuf.h

File Facts

System

Linux kernel

Corpus path

arch/s390/include/uapi/asm/ipcbuf.h

Extension

.h

Size

702 bytes

Lines

32

Domain

Architecture Layer

Bucket

arch/s390

Inferred role

Architecture Layer: implementation source

Status

source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

• CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/posix_types.h

Detected Declarations

• struct ipc64_perm

Annotated Snippet

#ifndef __S390_IPCBUF_H__
#define __S390_IPCBUF_H__

#include <linux/posix_types.h>

/*
 * The user_ipc_perm structure for S/390 architecture.
 * Note extra padding because this structure is passed back and forth
 * between kernel and user space.
 *
 * Pad space is left for:
 * - 32-bit mode_t and seq
 * - 2 miscellaneous 32-bit values
 */

struct ipc64_perm
{
	__kernel_key_t		key;
	__kernel_uid32_t	uid;
	__kernel_gid32_t	gid;
	__kernel_uid32_t	cuid;
	__kernel_gid32_t	cgid;
	__kernel_mode_t		mode;
	unsigned short		__pad1;
	unsigned short		seq;
	unsigned long		__unused1;
	unsigned long		__unused2;
};

#endif /* __S390_IPCBUF_H__ */

Annotation

• Immediate include surface: `linux/posix_types.h`.
• Detected declarations: `struct ipc64_perm`.
• Atlas domain: Architecture Layer / arch/s390.
• 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.