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

File Facts

System

Linux kernel

Corpus path

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

Extension

.c

Size

550 bytes

Lines

29

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

• vmlinux.h
• errno.h
• bpf/bpf_helpers.h
• bpf/bpf_tracing.h

Detected Declarations

• function BPF_PROG

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0

/*
 * Copyright (C) 2025 Microsoft Corporation
 *
 * Author: Blaise Boscaccy <bboscaccy@linux.microsoft.com>
 */

#include "vmlinux.h"
#include <errno.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>

char _license[] SEC("license") = "GPL";

__u32 monitored_tid;

SEC("lsm.s/bpf")
int BPF_PROG(bpf, int cmd, union bpf_attr *attr, unsigned int size, bool kernel)
{
	__u32 tid;

	tid = bpf_get_current_pid_tgid() & 0xFFFFFFFF;
	if (!kernel || tid != monitored_tid)
		return 0;
	else
		return -EINVAL;
}

Annotation

• Immediate include surface: `vmlinux.h`, `errno.h`, `bpf/bpf_helpers.h`, `bpf/bpf_tracing.h`.
• Detected declarations: `function BPF_PROG`.
• 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.