mirror of https://gitee.com/openkylin/linux.git
48 lines
985 B
C
48 lines
985 B
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2019 Facebook
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#include <linux/bpf.h>
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#include <linux/version.h>
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#include "bpf_helpers.h"
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struct {
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__uint(type, BPF_MAP_TYPE_ARRAY);
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__uint(max_entries, 1);
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__type(key, __u32);
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__type(value, __u64);
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} info_map SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_ARRAY);
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__uint(max_entries, 1);
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__type(key, __u32);
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__type(value, __u64);
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} status_map SEC(".maps");
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SEC("send_signal_demo")
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int bpf_send_signal_test(void *ctx)
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{
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__u64 *info_val, *status_val;
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__u32 key = 0, pid, sig;
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int ret;
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status_val = bpf_map_lookup_elem(&status_map, &key);
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if (!status_val || *status_val != 0)
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return 0;
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info_val = bpf_map_lookup_elem(&info_map, &key);
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if (!info_val || *info_val == 0)
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return 0;
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sig = *info_val >> 32;
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pid = *info_val & 0xffffFFFF;
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if ((bpf_get_current_pid_tgid() >> 32) == pid) {
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ret = bpf_send_signal(sig);
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if (ret == 0)
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*status_val = 1;
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}
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return 0;
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}
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char __license[] SEC("license") = "GPL";
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