sandboxed-api/oss-internship-2020/libuv/examples/idle-basic.cc

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// Copyright 2020 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
//
// 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 <linux/futex.h>
#include <syscall.h>
#include <uv.h>
#include <iostream>
#include "sandboxed_api/util/flag.h"
#include "uv_sapi.sapi.h" // NOLINT(build/include)
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namespace {
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class UVSapiIdleBasicSandbox : public uv::UVSandbox {
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private:
std::unique_ptr<sandbox2::Policy> ModifyPolicy(
sandbox2::PolicyBuilder*) override {
return sandbox2::PolicyBuilder()
.AllowDynamicStartup()
.AllowExit()
.AllowFutexOp(FUTEX_WAKE_PRIVATE)
.AllowSyscalls({__NR_epoll_create1, __NR_epoll_ctl, __NR_epoll_wait,
__NR_eventfd2, __NR_pipe2})
.AllowWrite()
.BuildOrDie();
}
};
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absl::Status IdleBasic() {
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// Initialize sandbox2 and sapi
UVSapiIdleBasicSandbox sandbox;
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SAPI_RETURN_IF_ERROR(sandbox.Init());
uv::UVApi api(&sandbox);
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// Get remote pointer to the IdleCallback method
void* function_ptr;
SAPI_RETURN_IF_ERROR(
sandbox.rpc_channel()->Symbol("IdleCallback", &function_ptr));
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sapi::v::RemotePtr idle_callback(function_ptr);
// Allocate memory for the uv_idle_t object
void* idle_voidptr;
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SAPI_RETURN_IF_ERROR(
sandbox.rpc_channel()->Allocate(sizeof(uv_idle_t), &idle_voidptr));
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sapi::v::RemotePtr idler(idle_voidptr);
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int return_code;
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// Get default loop
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SAPI_ASSIGN_OR_RETURN(void* loop_voidptr, api.sapi_uv_default_loop());
sapi::v::RemotePtr loop(loop_voidptr);
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// Initialize idler
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SAPI_ASSIGN_OR_RETURN(return_code, api.sapi_uv_idle_init(&loop, &idler));
if (return_code != 0) {
return absl::UnavailableError("sapi_uv_idle_init returned error " +
return_code);
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}
// Start idler
SAPI_ASSIGN_OR_RETURN(return_code,
api.sapi_uv_idle_start(&idler, &idle_callback));
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if (return_code != 0) {
return absl::UnavailableError("sapi_uv_idle_start returned error " +
return_code);
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}
// Run loop
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SAPI_ASSIGN_OR_RETURN(return_code, api.sapi_uv_run(&loop, UV_RUN_DEFAULT));
if (return_code != 0) {
return absl::UnavailableError("uv_run returned error " + return_code);
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}
// Close idler
sapi::v::NullPtr null_ptr;
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SAPI_RETURN_IF_ERROR(api.sapi_uv_close(&idler, &null_ptr));
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// Close loop
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SAPI_ASSIGN_OR_RETURN(return_code, api.sapi_uv_loop_close(&loop));
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// UV_EBUSY is accepted because it is the return code of uv_loop_close
// in the original example
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if (return_code != 0 && return_code != UV_EBUSY) {
return absl::UnavailableError("uv_loop_close returned error " +
return_code);
}
return absl::OkStatus();
}
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} // namespace
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int main(int argc, char* argv[]) {
gflags::ParseCommandLineFlags(&argc, &argv, true);
google::InitGoogleLogging(argv[0]);
if (absl::Status status = IdleBasic(); !status.ok()) {
LOG(ERROR) << "IdleBasic failed: " << status.ToString();
return EXIT_FAILURE;
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}
return EXIT_SUCCESS;
}