// SPDX-License-Identifier: GPL-2.0 // Copyright (c) 2019 Facebook #include <linux/ptrace.h> #include <linux/bpf.h> #include <bpf/bpf_helpers.h> #include <bpf/bpf_tracing.h> struct { __uint(type, BPF_MAP_TYPE_ARRAY); __type(key, int); __type(value, int); __uint(max_entries, 1); } my_pid_map SEC(".maps"); struct { __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); __type(key, int); __type(value, int); } perf_buf_map SEC(".maps"); SEC("tp/raw_syscalls/sys_enter") int handle_sys_enter(void *ctx) { int zero = 0, *my_pid, cur_pid; int cpu = bpf_get_smp_processor_id(); my_pid = bpf_map_lookup_elem(&my_pid_map, &zero); if (!my_pid) return 1; cur_pid = bpf_get_current_pid_tgid() >> 32; if (cur_pid != *my_pid) return 1; bpf_perf_event_output(ctx, &perf_buf_map, BPF_F_CURRENT_CPU, &cpu, sizeof(cpu)); return 1; } char _license[] SEC("license") = "GPL";