tools/testing/selftests/filesystems/empty_mntns/empty_mntns.h

File Facts

System

Linux kernel

Corpus path

tools/testing/selftests/filesystems/empty_mntns/empty_mntns.h

Extension

.h

Size

491 bytes

Lines

26

Domain

Support Tooling And Documentation

Bucket

tools

Inferred role

Support Tooling And Documentation: implementation source

Status

source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

• Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

• errno.h
• stdlib.h
• ../statmount/statmount.h

Detected Declarations

• function count_mounts

Annotated Snippet

#ifndef EMPTY_MNTNS_H
#define EMPTY_MNTNS_H

#include <errno.h>
#include <stdlib.h>

#include "../statmount/statmount.h"

#ifndef UNSHARE_EMPTY_MNTNS
#define UNSHARE_EMPTY_MNTNS	0x00100000
#endif

#ifndef CLONE_EMPTY_MNTNS
#define CLONE_EMPTY_MNTNS	(1ULL << 37)
#endif

static inline ssize_t count_mounts(void)
{
	uint64_t list[4096];

	return listmount(LSMT_ROOT, 0, 0, list, sizeof(list) / sizeof(list[0]), 0);
}

#endif /* EMPTY_MNTNS_H */

Annotation

• Immediate include surface: `errno.h`, `stdlib.h`, `../statmount/statmount.h`.
• Detected declarations: `function count_mounts`.
• Atlas domain: Support Tooling And Documentation / tools.
• 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.