tools/testing/selftests/bpf/urandom_read_lib1.c
Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/urandom_read_lib1.c
File Facts
- System
- Linux kernel
- Corpus path
tools/testing/selftests/bpf/urandom_read_lib1.c- Extension
.c- Size
- 912 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.
Dependency Surface
sdt.hbpf/libbpf_internal.h
Detected Declarations
function urandlib_read_with_semafunction urandlib_api_v1function urandlib_api_v2function urandlib_api_sameoffset
Annotated Snippet
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
#define _SDT_HAS_SEMAPHORES 1
#include "sdt.h"
#define SHARED 1
#include "bpf/libbpf_internal.h"
#define SEC(name) __attribute__((section(name), used))
unsigned short urandlib_read_with_sema_semaphore SEC(".probes");
void urandlib_read_with_sema(int iter_num, int iter_cnt, int read_sz)
{
STAP_PROBE3(urandlib, read_with_sema, iter_num, iter_cnt, read_sz);
}
COMPAT_VERSION(urandlib_api_v1, urandlib_api, LIBURANDOM_READ_1.0.0)
int urandlib_api_v1(void)
{
return 1;
}
DEFAULT_VERSION(urandlib_api_v2, urandlib_api, LIBURANDOM_READ_2.0.0)
int urandlib_api_v2(void)
{
return 2;
}
COMPAT_VERSION(urandlib_api_sameoffset, urandlib_api_sameoffset, LIBURANDOM_READ_1.0.0)
DEFAULT_VERSION(urandlib_api_sameoffset, urandlib_api_sameoffset, LIBURANDOM_READ_2.0.0)
int urandlib_api_sameoffset(void)
{
return 3;
}
Annotation
- Immediate include surface: `sdt.h`, `bpf/libbpf_internal.h`.
- Detected declarations: `function urandlib_read_with_sema`, `function urandlib_api_v1`, `function urandlib_api_v2`, `function urandlib_api_sameoffset`.
- 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.