1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
| // SPDX-License-Identifier: GPL-2.0
| /* Copyright (c) 2020 Tessares SA <http://www.tessares.net> */
|
| #include "vmlinux.h"
| #include <bpf/bpf_helpers.h>
|
| __u64 inKey = 0;
| __u64 inValue = 0;
| __u32 inPid = 0;
|
| struct {
| __uint(type, BPF_MAP_TYPE_PERCPU_HASH);
| __uint(max_entries, 2);
| __type(key, __u64);
| __type(value, __u64);
| } hashmap1 SEC(".maps");
|
|
| SEC("tp/syscalls/sys_enter_getpgid")
| int sysenter_getpgid(const void *ctx)
| {
| /* Just do it for once, when called from our own test prog. This
| * ensures the map value is only updated for a single CPU.
| */
| int cur_pid = bpf_get_current_pid_tgid() >> 32;
|
| if (cur_pid == inPid)
| bpf_map_update_elem(&hashmap1, &inKey, &inValue, BPF_NOEXIST);
|
| return 0;
| }
|
| char _license[] SEC("license") = "GPL";
|
|
