sandboxed-api/sandboxed_api/sandbox2/forkingclient.cc

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// Copyright 2019 Google LLC. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "sandboxed_api/sandbox2/forkingclient.h"
#include <unistd.h>
#include <glog/logging.h>
#include "sandboxed_api/sandbox2/sanitizer.h"
#include "absl/memory/memory.h"
namespace sandbox2 {
pid_t ForkingClient::WaitAndFork() {
// We don't instantiate the Fork-Server until the first Fork() call takes
// place (in order to conserve resources, and avoid calling Fork-Server
// initialization routines).
if (!fork_server_worker_) {
sanitizer::WaitForTsan();
// Perform that check once only, because it's quite CPU-expensive.
int n = sanitizer::GetNumberOfThreads(getpid());
CHECK_NE(n, -1) << "sanitizer::GetNumberOfThreads failed";
CHECK_EQ(n, 1) << "Too many threads (" << n
<< ") during sandbox2::Client::WaitAndFork()";
fork_server_worker_ = absl::make_unique<ForkServer>(comms_);
}
return fork_server_worker_->ServeRequest();
}
} // namespace sandbox2