/*
 *
 * 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 (
	
	
	
	

	
	
)

var logger = grpclog.Component("core")

// GetCPUTime returns the how much CPU time has passed since the start of this process.
func () int64 {
	var  unix.Timespec
	if  := unix.ClockGettime(unix.CLOCK_PROCESS_CPUTIME_ID, &);  != nil {
		logger.Fatal()
	}
	return .Nano()
}

// Rusage is an alias for syscall.Rusage under linux environment.
type Rusage = syscall.Rusage

// GetRusage returns the resource usage of current process.
func () *Rusage {
	 := new(Rusage)
	syscall.Getrusage(syscall.RUSAGE_SELF, )
	return 
}

// CPUTimeDiff returns the differences of user CPU time and system CPU time used
// between two Rusage structs.
func ( *Rusage,  *Rusage) (float64, float64) {
	var (
		  = .Utime.Sec - .Utime.Sec
		 = .Utime.Usec - .Utime.Usec
		  = .Stime.Sec - .Stime.Sec
		 = .Stime.Usec - .Stime.Usec
	)

	 := float64() + float64()*1.0e-6
	 := float64() + float64()*1.0e-6

	return , 
}

// SetTCPUserTimeout sets the TCP user timeout on a connection's socket
func ( net.Conn,  time.Duration) error {
	,  := .(*net.TCPConn)
	if ! {
		// not a TCP connection. exit early
		return nil
	}
	,  := .SyscallConn()
	if  != nil {
		return fmt.Errorf("error getting raw connection: %v", )
	}
	 = .Control(func( uintptr) {
		 = syscall.SetsockoptInt(int(), syscall.IPPROTO_TCP, unix.TCP_USER_TIMEOUT, int(/time.Millisecond))
	})
	if  != nil {
		return fmt.Errorf("error setting option on socket: %v", )
	}

	return nil
}

// GetTCPUserTimeout gets the TCP user timeout on a connection's socket
func ( net.Conn) ( int,  error) {
	,  := .(*net.TCPConn)
	if ! {
		 = fmt.Errorf("conn is not *net.TCPConn. got %T", )
		return
	}
	,  := .SyscallConn()
	if  != nil {
		 = fmt.Errorf("error getting raw connection: %v", )
		return
	}
	 = .Control(func( uintptr) {
		,  = syscall.GetsockoptInt(int(), syscall.IPPROTO_TCP, unix.TCP_USER_TIMEOUT)
	})
	if  != nil {
		 = fmt.Errorf("error getting option on socket: %v", )
		return
	}

	return
}