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

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

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/progs/uprobe_multi_session_recursive.c
Extension
.c
Size
931 bytes
Lines
44
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 <vmlinux.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include <stdbool.h>
#include "bpf_misc.h"

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

int pid = 0;

int idx_entry = 0;
int idx_return = 0;

__u64 test_uprobe_cookie_entry[6];
__u64 test_uprobe_cookie_return[3];

static int check_cookie(struct pt_regs *ctx)
{
	__u64 *cookie = bpf_session_cookie(ctx);

	if (bpf_session_is_return(ctx)) {
		if (idx_return >= ARRAY_SIZE(test_uprobe_cookie_return))
			return 1;
		test_uprobe_cookie_return[idx_return++] = *cookie;
		return 0;
	}

	if (idx_entry >= ARRAY_SIZE(test_uprobe_cookie_entry))
		return 1;
	*cookie = test_uprobe_cookie_entry[idx_entry];
	return idx_entry++ % 2;
}


SEC("uprobe.session//proc/self/exe:uprobe_session_recursive")
int uprobe_recursive(struct pt_regs *ctx)
{
	if (bpf_get_current_pid_tgid() >> 32 != pid)
		return 1;

	return check_cookie(ctx);
}

Annotation

Implementation Notes