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

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

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/progs/tailcall_sleepable.c
Extension
.c
Size
753 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 <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
#include "bpf_test_utils.h"

struct {
	__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
	__uint(max_entries, 1);
	__uint(key_size, sizeof(__u32));
	__array(values, void (void));
} jmp_table SEC(".maps");

SEC("?uprobe")
int uprobe_normal(void *ctx)
{
	bpf_tail_call_static(ctx, &jmp_table, 0);
	return 0;
}

SEC("?uprobe.s")
int uprobe_sleepable_1(void *ctx)
{
	bpf_tail_call_static(ctx, &jmp_table, 0);
	return 0;
}

int executed = 0;
int my_pid = 0;

SEC("?uprobe.s")
int uprobe_sleepable_2(void *ctx)
{
	int pid = bpf_get_current_pid_tgid() >> 32;

	if (pid != my_pid)
		return 0;

	executed++;
	return 0;
}

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

Annotation

Implementation Notes