tcpsockopt_darwin.go

     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  // syscall.TCP_KEEPINTVL and syscall.TCP_KEEPCNT might be missing on some darwin architectures.
    14  const (
    15  	sysTCP_KEEPINTVL = 0x101
    16  	sysTCP_KEEPCNT   = 0x102
    17  )
    18  
    19  func setKeepAliveIdle(fd *netFD, d time.Duration) error {
    20  	if d == 0 {
    21  		d = defaultTCPKeepAliveIdle
    22  	} else if d < 0 {
    23  		return nil
    24  	}
    25  
    26  	// The kernel expects seconds so round to next highest second.
    27  	secs := int(roundDurationUp(d, time.Second))
    28  	err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, syscall.TCP_KEEPALIVE, secs)
    29  	runtime.KeepAlive(fd)
    30  	return wrapSyscallError("setsockopt", err)
    31  }
    32  
    33  func setKeepAliveInterval(fd *netFD, d time.Duration) error {
    34  	if d == 0 {
    35  		d = defaultTCPKeepAliveInterval
    36  	} else if d < 0 {
    37  		return nil
    38  	}
    39  
    40  	// The kernel expects seconds so round to next highest second.
    41  	secs := int(roundDurationUp(d, time.Second))
    42  	err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, sysTCP_KEEPINTVL, secs)
    43  	runtime.KeepAlive(fd)
    44  	return wrapSyscallError("setsockopt", err)
    45  }
    46  
    47  func setKeepAliveCount(fd *netFD, n int) error {
    48  	if n == 0 {
    49  		n = defaultTCPKeepAliveCount
    50  	} else if n < 0 {
    51  		return nil
    52  	}
    53  
    54  	err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, sysTCP_KEEPCNT, n)
    55  	runtime.KeepAlive(fd)
    56  	return wrapSyscallError("setsockopt", err)
    57  }
    58
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