// 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";