// SPDX-License-Identifier: GPL-2.0 /* Copyright (C) 2022. Huawei Technologies Co., Ltd */ #include <linux/bpf.h> #include <bpf/bpf_helpers.h> #include <bpf/bpf_tracing.h> char _license[] SEC("license") = "GPL"; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 1); __uint(key_size, sizeof(__u32)); __uint(value_size, sizeof(__u32)); } htab SEC(".maps"); int pid = 0; int update_err = 0; SEC("?fentry/lookup_elem_raw") int lookup_elem_raw(void *ctx) { __u32 key = 0, value = 1; if ((bpf_get_current_pid_tgid() >> 32) != pid) return 0; update_err = bpf_map_update_elem(&htab, &key, &value, 0); return 0; }