Source: syscall_nonlinux.go in package google.golang.org/grpc/internal/syscall

+build !linux appengine

* * Copyright 2018 gRPC authors. * * 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. *

Package syscall provides functionalities that grpc uses to get low-level operating system stats/info.

package syscall

import (
	"net"
	"sync"
	"time"

	"google.golang.org/grpc/grpclog"
)

var once sync.Once
var logger = grpclog.Component("core")

func log() {
	once.Do(func() {
		logger.Info("CPU time info is unavailable on non-linux environment.")
	})
}

GetCPUTime returns the how much CPU time has passed since the start of this process. It always returns 0 under non-linux environment.

func GetCPUTime() int64 {
	log()
	return 0
}

Rusage is an empty struct under non-linux environment.

type Rusage struct{}

GetRusage is a no-op function under non-linux environment.

func GetRusage() (rusage *Rusage) {
	log()
	return nil
}

CPUTimeDiff returns the differences of user CPU time and system CPU time used between two Rusage structs. It a no-op function for non-linux environment.

func CPUTimeDiff(first *Rusage, latest *Rusage) (float64, float64) {
	log()
	return 0, 0
}

SetTCPUserTimeout is a no-op function under non-linux environments

func SetTCPUserTimeout(conn net.Conn, timeout time.Duration) error {
	log()
	return nil
}

GetTCPUserTimeout is a no-op function under non-linux environments a negative return value indicates the operation is not supported

func GetTCPUserTimeout(conn net.Conn) (int, error) {
	log()
	return -1, nil