// 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"; /* Map value type: has BTF-managed field (bpf_timer) */ struct val { struct bpf_timer t; __u64 payload; }; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 1); __type(key, __u32); __type(value, struct val); } htab SEC(".maps"); int pid = 0; int update_err = 0; SEC("?fentry/bpf_obj_free_fields") int bpf_obj_free_fields(void *ctx) { __u32 key = 0; struct val value = { .payload = 1 }; if ((bpf_get_current_pid_tgid() >> 32) != pid) return 0; update_err = bpf_map_update_elem(&htab, &key, &value, BPF_ANY); return 0; }