tools/testing/selftests/bpf/progs/test_usdt_multispec.c
Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/progs/test_usdt_multispec.c
File Facts
- System
- Linux kernel
- Corpus path
tools/testing/selftests/bpf/progs/test_usdt_multispec.c- Extension
.c- Size
- 679 bytes
- Lines
- 31
- 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.hbpf/bpf_helpers.hbpf/usdt.bpf.h
Detected Declarations
function BPF_USDT
Annotated Snippet
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include <bpf/usdt.bpf.h>
/* this file is linked together with test_usdt.c to validate that usdt.bpf.h
* can be included in multiple .bpf.c files forming single final BPF object
* file
*/
extern int my_pid;
int usdt_100_called;
int usdt_100_sum;
SEC("usdt//proc/self/exe:test:usdt_100")
int BPF_USDT(usdt_100, int x)
{
if (my_pid != (bpf_get_current_pid_tgid() >> 32))
return 0;
__sync_fetch_and_add(&usdt_100_called, 1);
__sync_fetch_and_add(&usdt_100_sum, x);
return 0;
}
char _license[] SEC("license") = "GPL";
Annotation
- Immediate include surface: `vmlinux.h`, `bpf/bpf_helpers.h`, `bpf/usdt.bpf.h`.
- Detected declarations: `function BPF_USDT`.
- 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.