github.com/code-reading/golang@v0.0.0-20220303082512-ba5bc0e589a3/go/src/net/tcpsockopt_dragonfly.go (about) 1 // Copyright 2009 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package net 6 7 import ( 8 "runtime" 9 "syscall" 10 "time" 11 ) 12 13 func setKeepAlivePeriod(fd *netFD, d time.Duration) error { 14 // The kernel expects milliseconds so round to next highest 15 // millisecond. 16 msecs := int(roundDurationUp(d, time.Millisecond)) 17 if err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, syscall.TCP_KEEPINTVL, msecs); err != nil { 18 return wrapSyscallError("setsockopt", err) 19 } 20 err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, syscall.TCP_KEEPIDLE, msecs) 21 runtime.KeepAlive(fd) 22 return wrapSyscallError("setsockopt", err) 23 }