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Source file src/net/sockoptip_posix.go

Documentation: net

     1  // Copyright 2011 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  //go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || windows
     6  // +build aix darwin dragonfly freebsd linux netbsd openbsd solaris windows
     7  
     8  package net
     9  
    10  import (
    11  	"runtime"
    12  	"syscall"
    13  )
    14  
    15  func joinIPv4Group(fd *netFD, ifi *Interface, ip IP) error {
    16  	mreq := &syscall.IPMreq{Multiaddr: [4]byte{ip[0], ip[1], ip[2], ip[3]}}
    17  	if err := setIPv4MreqToInterface(mreq, ifi); err != nil {
    18  		return err
    19  	}
    20  	err := fd.pfd.SetsockoptIPMreq(syscall.IPPROTO_IP, syscall.IP_ADD_MEMBERSHIP, mreq)
    21  	runtime.KeepAlive(fd)
    22  	return wrapSyscallError("setsockopt", err)
    23  }
    24  
    25  func setIPv6MulticastInterface(fd *netFD, ifi *Interface) error {
    26  	var v int
    27  	if ifi != nil {
    28  		v = ifi.Index
    29  	}
    30  	err := fd.pfd.SetsockoptInt(syscall.IPPROTO_IPV6, syscall.IPV6_MULTICAST_IF, v)
    31  	runtime.KeepAlive(fd)
    32  	return wrapSyscallError("setsockopt", err)
    33  }
    34  
    35  func setIPv6MulticastLoopback(fd *netFD, v bool) error {
    36  	err := fd.pfd.SetsockoptInt(syscall.IPPROTO_IPV6, syscall.IPV6_MULTICAST_LOOP, boolint(v))
    37  	runtime.KeepAlive(fd)
    38  	return wrapSyscallError("setsockopt", err)
    39  }
    40  
    41  func joinIPv6Group(fd *netFD, ifi *Interface, ip IP) error {
    42  	mreq := &syscall.IPv6Mreq{}
    43  	copy(mreq.Multiaddr[:], ip)
    44  	if ifi != nil {
    45  		mreq.Interface = uint32(ifi.Index)
    46  	}
    47  	err := fd.pfd.SetsockoptIPv6Mreq(syscall.IPPROTO_IPV6, syscall.IPV6_JOIN_GROUP, mreq)
    48  	runtime.KeepAlive(fd)
    49  	return wrapSyscallError("setsockopt", err)
    50  }
    51  

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