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.

Dependency Surface

Detected Declarations

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

Implementation Notes