| // Copyright 2019 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package net |
| |
| import ( |
| "runtime" |
| "syscall" |
| "time" |
| ) |
| |
| func setNoDelay(fd *netFD, noDelay bool) error { |
| b := make([]byte, 4) |
| if noDelay { |
| b[0] = 1 |
| } |
| err := fd.sock.SetSockOpt(syscall.SOL_TCP, syscall.TCP_NODELAY, b) |
| runtime.KeepAlive(fd) |
| return err |
| } |
| |
| func setKeepAlivePeriod(fd *netFD, d time.Duration) error { |
| // The socket option expects seconds so round to next highest second. |
| secs := uint32((d + time.Second - 1) / time.Second) |
| |
| b := make([]byte, 4) |
| putUint32(b, secs) |
| |
| if err := fd.sock.SetSockOpt(syscall.SOL_TCP, syscall.TCP_KEEPINTVL, b); err != nil { |
| return wrapSyscallError("setsockopt", err) |
| } |
| err := fd.sock.SetSockOpt(syscall.SOL_TCP, syscall.TCP_KEEPIDLE, b) |
| runtime.KeepAlive(fd) |
| return wrapSyscallError("setsockopt", err) |
| } |
| |
| func putUint32(b []byte, v uint32) { |
| _ = b[3] // early bounds check to guarantee safety of writes below |
| b[0] = byte(v) |
| b[1] = byte(v >> 8) |
| b[2] = byte(v >> 16) |
| b[3] = byte(v >> 24) |
| } |
