tools/testing/selftests/bpf/progs/fexit_sleep.c
Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/progs/fexit_sleep.c
File Facts
- System
- Linux kernel
- Corpus path
tools/testing/selftests/bpf/progs/fexit_sleep.c- Extension
.c- Size
- 589 bytes
- Lines
- 33
- 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/bpf_tracing.hbpf_misc.h
Detected Declarations
function nanosleep_fentryfunction nanosleep_fexit
Annotated Snippet
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2021 Facebook */
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include "bpf_misc.h"
char LICENSE[] SEC("license") = "GPL";
int pid = 0;
int fentry_cnt = 0;
int fexit_cnt = 0;
SEC("fentry/" SYS_PREFIX "sys_nanosleep")
int nanosleep_fentry(void *ctx)
{
if (bpf_get_current_pid_tgid() >> 32 != pid)
return 0;
fentry_cnt++;
return 0;
}
SEC("fexit/" SYS_PREFIX "sys_nanosleep")
int nanosleep_fexit(void *ctx)
{
if (bpf_get_current_pid_tgid() >> 32 != pid)
return 0;
fexit_cnt++;
return 0;
}
Annotation
- Immediate include surface: `vmlinux.h`, `bpf/bpf_helpers.h`, `bpf/bpf_tracing.h`, `bpf_misc.h`.
- Detected declarations: `function nanosleep_fentry`, `function nanosleep_fexit`.
- 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.