34 lines
752 B
C
34 lines
752 B
C
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2020 Tessares SA <http://www.tessares.net> */
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#include "vmlinux.h"
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#include <bpf/bpf_helpers.h>
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__u64 inKey = 0;
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__u64 inValue = 0;
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__u32 inPid = 0;
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struct {
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__uint(type, BPF_MAP_TYPE_PERCPU_HASH);
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__uint(max_entries, 2);
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__type(key, __u64);
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__type(value, __u64);
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} hashmap1 SEC(".maps");
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SEC("tp/syscalls/sys_enter_getpgid")
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int sysenter_getpgid(const void *ctx)
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{
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/* Just do it for once, when called from our own test prog. This
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* ensures the map value is only updated for a single CPU.
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*/
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int cur_pid = bpf_get_current_pid_tgid() >> 32;
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if (cur_pid == inPid)
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bpf_map_update_elem(&hashmap1, &inKey, &inValue, BPF_NOEXIST);
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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