| // 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"; |
