mirror of
https://github.com/facebookexperimental/reverie.git
synced 2024-10-23 20:59:52 +00:00
79 lines
2.3 KiB
Rust
79 lines
2.3 KiB
Rust
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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//! An example that counts system calls using a simple, global state.
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use reverie::{
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syscalls::{Syscall, SyscallInfo, Sysno},
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Error, GlobalTool, Guest, Pid, Tool,
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};
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use reverie_util::CommonToolArguments;
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use serde::{Deserialize, Serialize};
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use std::sync::atomic::{AtomicU64, Ordering};
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use structopt::StructOpt;
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#[derive(Debug, Serialize, Deserialize, Default)]
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struct CounterGlobal {
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num_syscalls: AtomicU64,
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}
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#[derive(Debug, Serialize, Deserialize, Default, Clone)]
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struct CounterLocal {}
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/// The message sent to the global state method.
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/// This contains the syscall number.
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#[derive(PartialEq, Debug, Eq, Clone, Copy, Serialize, Deserialize)]
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pub struct IncrMsg(Sysno);
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#[reverie::global_tool]
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impl GlobalTool for CounterGlobal {
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type Request = IncrMsg;
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type Response = ();
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async fn init_global_state(_: &Self::Config) -> Self {
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CounterGlobal {
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num_syscalls: AtomicU64::new(0),
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}
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}
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async fn receive_rpc(&self, _from: Pid, IncrMsg(sysno): IncrMsg) -> Self::Response {
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AtomicU64::fetch_add(&self.num_syscalls, 1, Ordering::SeqCst);
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tracing::info!("count at syscall ({:?}): {:?}", sysno, self.num_syscalls);
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}
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}
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#[reverie::tool]
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impl Tool for CounterLocal {
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type GlobalState = CounterGlobal;
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async fn handle_syscall_event<T: Guest<Self>>(
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&self,
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guest: &mut T,
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syscall: Syscall,
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) -> Result<i64, Error> {
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let sysno = syscall.number();
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let _ = guest.send_rpc(IncrMsg(sysno)).await?;
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guest.tail_inject(syscall).await
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}
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}
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#[tokio::main]
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async fn main() -> Result<(), Error> {
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let args = CommonToolArguments::from_args();
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let log_guard = args.init_tracing();
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let tracer = reverie_ptrace::TracerBuilder::<CounterLocal>::new(args.into())
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.spawn()
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.await?;
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let (status, global_state) = tracer.wait().await?;
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eprintln!(
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" [counter tool] Total system calls in process tree: {}",
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AtomicU64::load(&global_state.num_syscalls, Ordering::SeqCst)
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);
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drop(log_guard); // Flush logs before exiting.
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status.raise_or_exit()
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}
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