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// 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.

// +build netbsd freebsd dragonfly linux

package netpoll

import "syscall"

// just support ipv4

func SetKeepAlive(fd, secs int) error {

// open keep-alive

if err := syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_KEEPALIVE, 1); err != nil {

return err

}

// tcp_keepalive_intvl

if err := syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, syscall.TCP_KEEPINTVL, secs); err != nil {

return err

}

// tcp_keepalive_probes

// if err := syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, syscall.TCP_KEEPCNT, 1); err != nil {

// return err

// }

// tcp_keepalive_time

return syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, syscall.TCP_KEEPIDLE, secs)

}