| //go:build !linux |
| // +build !linux |
| |
| /* |
| * |
| * 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 environments.") |
| }) |
| } |
| |
| // GetCPUTime returns the how much CPU time has passed since the start of this |
| // process. It always returns 0 under non-linux environments. |
| func GetCPUTime() int64 { |
| log() |
| return 0 |
| } |
| |
| // Rusage is an empty struct under non-linux environments. |
| type Rusage struct{} |
| |
| // GetRusage is a no-op function under non-linux environments. |
| func GetRusage() *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 environments. |
| 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 |
| } |