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

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/progs/trace_dummy_st_ops.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/progs/trace_dummy_st_ops.c
Extension
.c
Size
476 bytes
Lines
22
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
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>

int val = 0;

SEC("fentry/test_1")
int BPF_PROG(fentry_test_1, __u64 *st_ops_ctx)
{
	__u64 state;

	/* Read the traced st_ops arg1 which is a pointer */
	bpf_probe_read_kernel(&state, sizeof(__u64), (void *)st_ops_ctx);
	/* Read state->val */
	bpf_probe_read_kernel(&val, sizeof(__u32), (void *)state);

	return 0;
}

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

Annotation

Implementation Notes