// SPDX-License-Identifier: GPL-2.0 // Copyright (c) 2019 Facebook #include #include #include "bpf_helpers.h" struct { __u32 type; __u32 max_entries; __u32 *key; __u64 *value; } info_map SEC(".maps") = { .type = BPF_MAP_TYPE_ARRAY, .max_entries = 1, }; struct { __u32 type; __u32 max_entries; __u32 *key; __u64 *value; } status_map SEC(".maps") = { .type = BPF_MAP_TYPE_ARRAY, .max_entries = 1, }; SEC("send_signal_demo") int bpf_send_signal_test(void *ctx) { __u64 *info_val, *status_val; __u32 key = 0, pid, sig; int ret; status_val = bpf_map_lookup_elem(&status_map, &key); if (!status_val || *status_val != 0) return 0; info_val = bpf_map_lookup_elem(&info_map, &key); if (!info_val || *info_val == 0) return 0; sig = *info_val >> 32; pid = *info_val & 0xffffFFFF; if ((bpf_get_current_pid_tgid() >> 32) == pid) { ret = bpf_send_signal(sig); if (ret == 0) *status_val = 1; } return 0; } char __license[] SEC("license") = "GPL";