cubefs

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// +build !linux appengine
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/*
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 *
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 * Copyright 2018 gRPC authors.
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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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 *
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 */
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// Package syscall provides functionalities that grpc uses to get low-level
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// operating system stats/info.
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package syscall
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import (
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	"net"
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	"sync"
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	"time"
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	"google.golang.org/grpc/grpclog"
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)
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var once sync.Once
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var logger = grpclog.Component("core")
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func log() {
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	once.Do(func() {
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		logger.Info("CPU time info is unavailable on non-linux or appengine environment.")
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	})
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}
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// GetCPUTime returns the how much CPU time has passed since the start of this process.
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// It always returns 0 under non-linux or appengine environment.
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func GetCPUTime() int64 {
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	log()
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	return 0
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}
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// Rusage is an empty struct under non-linux or appengine environment.
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type Rusage struct{}
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// GetRusage is a no-op function under non-linux or appengine environment.
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func GetRusage() *Rusage {
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	log()
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	return nil
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}
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// CPUTimeDiff returns the differences of user CPU time and system CPU time used
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// between two Rusage structs. It a no-op function for non-linux or appengine environment.
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func CPUTimeDiff(first *Rusage, latest *Rusage) (float64, float64) {
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	log()
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	return 0, 0
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}
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// SetTCPUserTimeout is a no-op function under non-linux or appengine environments
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func SetTCPUserTimeout(conn net.Conn, timeout time.Duration) error {
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	log()
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	return nil
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}
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// GetTCPUserTimeout is a no-op function under non-linux or appengine environments
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// a negative return value indicates the operation is not supported
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func GetTCPUserTimeout(conn net.Conn) (int, error) {
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	log()
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	return -1, nil
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}
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