116 lines
3.4 KiB
C++
116 lines
3.4 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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// https://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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#include <linux/futex.h>
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#include <syscall.h>
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#include <uv.h>
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#include <iostream>
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#include "absl/flags/flag.h"
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#include "absl/log/initialize.h"
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#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:
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std::unique_ptr<sandbox2::Policy> ModifyPolicy(
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sandbox2::PolicyBuilder*) override {
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return sandbox2::PolicyBuilder()
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.AllowDynamicStartup()
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.AllowExit()
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.AllowFutexOp(FUTEX_WAKE_PRIVATE)
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.AllowSyscalls({__NR_epoll_create1, __NR_epoll_ctl, __NR_epoll_wait,
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__NR_eventfd2, __NR_pipe2})
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.AllowWrite()
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.BuildOrDie();
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}
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};
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absl::Status IdleBasic() {
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// Initialize sandbox2 and sapi
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UVSapiIdleBasicSandbox sandbox;
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SAPI_RETURN_IF_ERROR(sandbox.Init());
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uv::UVApi api(&sandbox);
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// Get remote pointer to the IdleCallback method
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void* function_ptr;
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SAPI_RETURN_IF_ERROR(
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sandbox.rpc_channel()->Symbol("IdleCallback", &function_ptr));
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sapi::v::RemotePtr idle_callback(function_ptr);
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// Allocate memory for the uv_idle_t object
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void* idle_voidptr;
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SAPI_RETURN_IF_ERROR(
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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());
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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));
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if (return_code != 0) {
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return absl::UnavailableError("sapi_uv_idle_init returned error " +
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return_code);
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}
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// Start idler
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SAPI_ASSIGN_OR_RETURN(return_code,
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api.sapi_uv_idle_start(&idler, &idle_callback));
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if (return_code != 0) {
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return absl::UnavailableError("sapi_uv_idle_start returned error " +
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return_code);
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}
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// Run loop
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SAPI_ASSIGN_OR_RETURN(return_code, api.sapi_uv_run(&loop, UV_RUN_DEFAULT));
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if (return_code != 0) {
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return absl::UnavailableError("uv_run returned error " + return_code);
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}
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// Close idler
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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
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// in the original example
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if (return_code != 0 && return_code != UV_EBUSY) {
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return absl::UnavailableError("uv_loop_close returned error " +
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return_code);
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}
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return absl::OkStatus();
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}
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} // namespace
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int main(int argc, char* argv[]) {
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absl::ParseCommandLine(argc, argv);
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absl::InitializeLog();
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if (absl::Status status = IdleBasic(); !status.ok()) {
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LOG(ERROR) << "IdleBasic failed: " << status.ToString();
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return EXIT_FAILURE;
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}
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return EXIT_SUCCESS;
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}
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