sandboxed-api/sandboxed_api/sandbox2/forkingclient.cc
Wiktor Garbacz 127176d72f Bulk IWYU and build_cleaner fixes
PiperOrigin-RevId: 559733768
Change-Id: Ia38f4c176e9f0abbfdb3a8f1109f482d8870eb0f
2023-08-24 06:23:36 -07:00

52 lines
1.7 KiB
C++

// Copyright 2019 Google LLC
//
// 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
//
// https://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 <cstdlib>
#include <memory>
#include "absl/log/check.h"
#include "absl/log/log.h"
#include "sandboxed_api/sandbox2/forkserver.h"
#include "sandboxed_api/sandbox2/sanitizer.h"
#include "sandboxed_api/util/raw_logging.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::WaitForSanitizer();
// 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_ = std::make_unique<ForkServer>(comms_);
}
pid_t pid = fork_server_worker_->ServeRequest();
if (pid == -1 && fork_server_worker_->IsTerminated()) {
VLOG(1) << "ForkServer Comms closed. Exiting";
exit(0);
}
return pid;
}
} // namespace sandbox2