tools/testing/selftests/bpf/progs/test_global_func10.c

File Facts

System

Linux kernel

Corpus path

tools/testing/selftests/bpf/progs/test_global_func10.c

Extension

.c

Size

601 bytes

Lines

36

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

• stddef.h
• linux/bpf.h
• bpf/bpf_helpers.h
• bpf_misc.h

Detected Declarations

• struct Small
• struct Big
• function foo
• function __msg

Annotated Snippet

struct Small {
	long x;
};

struct Big {
	long x;
	long y;
};

__noinline int foo(const struct Big *big)
{
	if (!big)
		return 0;

	return bpf_get_prandom_u32() < big->y;
}

SEC("cgroup_skb/ingress")
__failure __msg("invalid read from stack")
int global_func10(struct __sk_buff *skb)
{
	const struct Small small = {.x = skb->len };

	return foo((struct Big *)&small) ? 1 : 0;
}

Annotation

• Immediate include surface: `stddef.h`, `linux/bpf.h`, `bpf/bpf_helpers.h`, `bpf_misc.h`.
• Detected declarations: `struct Small`, `struct Big`, `function foo`, `function __msg`.
• 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.