github.com/graybobo/golang.org-package-offline-cache@v0.0.0-20200626051047-6608995c132f/x/net/ipv4/sockopt_asmreq_unix.go (about)

     1  // Copyright 2012 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  // +build darwin dragonfly freebsd netbsd openbsd
     6  
     7  package ipv4
     8  
     9  import (
    10  	"net"
    11  	"os"
    12  	"unsafe"
    13  
    14  	"golang.org/x/net/internal/iana"
    15  )
    16  
    17  func setsockoptIPMreq(fd, name int, ifi *net.Interface, grp net.IP) error {
    18  	mreq := sysIPMreq{Multiaddr: [4]byte{grp[0], grp[1], grp[2], grp[3]}}
    19  	if err := setIPMreqInterface(&mreq, ifi); err != nil {
    20  		return err
    21  	}
    22  	return os.NewSyscallError("setsockopt", setsockopt(fd, iana.ProtocolIP, name, unsafe.Pointer(&mreq), sysSizeofIPMreq))
    23  }
    24  
    25  func getsockoptInterface(fd, name int) (*net.Interface, error) {
    26  	var b [4]byte
    27  	l := sysSockoptLen(4)
    28  	if err := getsockopt(fd, iana.ProtocolIP, name, unsafe.Pointer(&b[0]), &l); err != nil {
    29  		return nil, os.NewSyscallError("getsockopt", err)
    30  	}
    31  	ifi, err := netIP4ToInterface(net.IPv4(b[0], b[1], b[2], b[3]))
    32  	if err != nil {
    33  		return nil, err
    34  	}
    35  	return ifi, nil
    36  }
    37  
    38  func setsockoptInterface(fd, name int, ifi *net.Interface) error {
    39  	ip, err := netInterfaceToIP4(ifi)
    40  	if err != nil {
    41  		return err
    42  	}
    43  	var b [4]byte
    44  	copy(b[:], ip)
    45  	return os.NewSyscallError("setsockopt", setsockopt(fd, iana.ProtocolIP, name, unsafe.Pointer(&b[0]), sysSockoptLen(4)))
    46  }