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f8a2729c32
Allow disabling global fork-server with a flag. PiperOrigin-RevId: 340860588 Change-Id: I184603dc3a81eb90f715053e14fb3b8d66a6f104
55 lines
1.7 KiB
C++
55 lines
1.7 KiB
C++
// Copyright 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef SANDBOXED_API_SANDBOX2_FORK_CLIENT_H_
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#define SANDBOXED_API_SANDBOX2_FORK_CLIENT_H_
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#include <sys/types.h>
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#include "absl/base/thread_annotations.h"
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#include "absl/synchronization/mutex.h"
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namespace sandbox2 {
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// Envvar indicating that this process should not start the fork-server.
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constexpr inline char kForkServerDisableEnv[] = "SANDBOX2_NOFORKSERVER";
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class Comms;
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class ForkRequest;
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class ForkClient {
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public:
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ForkClient(pid_t pid, Comms* comms) : pid_(pid), comms_(comms) {}
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ForkClient(const ForkClient&) = delete;
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ForkClient& operator=(const ForkClient&) = delete;
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// Sends the fork request over the supplied Comms channel.
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pid_t SendRequest(const ForkRequest& request, int exec_fd, int comms_fd,
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int user_ns_fd = -1, pid_t* init_pid = nullptr);
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pid_t pid() { return pid_; }
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private:
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// Pid of the ForkServer.
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pid_t pid_;
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// Comms channel connecting with the ForkServer. Not owned by the object.
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Comms* comms_ ABSL_GUARDED_BY(comms_mutex_);
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// Mutex locking transactions (requests) over the Comms channel.
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absl::Mutex comms_mutex_;
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};
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} // namespace sandbox2
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#endif // SANDBOXED_API_SANDBOX2_FORK_CLIENT_H_
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