tools/perf/util/cap.c

File Facts

System

Linux kernel

Corpus path

tools/perf/util/cap.c

Extension

.c

Size

1235 bytes

Lines

49

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.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• cap.h
• debug.h
• errno.h
• string.h
• sys/syscall.h
• unistd.h

Detected Declarations

• function perf_cap__capable

Annotated Snippet

if (header.version == _LINUX_CAPABILITY_VERSION_3) {
			cap_val = data[1].effective;
		} else {
			/* Capability beyond 32 is requested but only 32 are supported. */
			return false;
		}
	} else {
		cap_val = data[0].effective;
	}
	return (cap_val & (1 << (cap & 0x1f))) != 0;
}

Annotation

• Immediate include surface: `cap.h`, `debug.h`, `errno.h`, `string.h`, `sys/syscall.h`, `unistd.h`.
• Detected declarations: `function perf_cap__capable`.
• 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.