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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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12345678910111213141516171819202122232425262728293031323334353637383940/* SPDX-License-Identifier: GPL-2.0 *//* Copyright (c) 2021 Hengqi Chen */
#include "vmlinux.h"#include <bpf/bpf_helpers.h>#include <bpf/bpf_tracing.h>
const volatile pid_t my_pid = 0;int value = 0;
SEC("raw_tp/sys_enter")int tailcall_1(void *ctx){ value = 42; return 0;}
struct { __uint(type, BPF_MAP_TYPE_PROG_ARRAY); __uint(max_entries, 2); __uint(key_size, sizeof(__u32)); __array(values, int (void *));} prog_array_init SEC(".maps") = { .values = { [1] = (void *)&tailcall_1, },};
SEC("raw_tp/sys_enter")int entry(void *ctx){ pid_t pid = bpf_get_current_pid_tgid() >> 32;
if (pid != my_pid) return 0;
bpf_tail_call(ctx, &prog_array_init, 1); return 0;}