github.com/graybobo/golang.org-package-offline-cache@v0.0.0-20200626051047-6608995c132f/x/net/ipv6/sockopt_ssmreq_unix.go (about)

     1  // Copyright 2014 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 freebsd linux
     6  
     7  package ipv6
     8  
     9  import (
    10  	"net"
    11  	"os"
    12  	"unsafe"
    13  )
    14  
    15  var freebsd32o64 bool
    16  
    17  func setsockoptGroupReq(fd int, opt *sockOpt, ifi *net.Interface, grp net.IP) error {
    18  	var gr sysGroupReq
    19  	if ifi != nil {
    20  		gr.Interface = uint32(ifi.Index)
    21  	}
    22  	gr.setGroup(grp)
    23  	var p unsafe.Pointer
    24  	var l sysSockoptLen
    25  	if freebsd32o64 {
    26  		var d [sysSizeofGroupReq + 4]byte
    27  		s := (*[sysSizeofGroupReq]byte)(unsafe.Pointer(&gr))
    28  		copy(d[:4], s[:4])
    29  		copy(d[8:], s[4:])
    30  		p = unsafe.Pointer(&d[0])
    31  		l = sysSizeofGroupReq + 4
    32  	} else {
    33  		p = unsafe.Pointer(&gr)
    34  		l = sysSizeofGroupReq
    35  	}
    36  	return os.NewSyscallError("setsockopt", setsockopt(fd, opt.level, opt.name, p, l))
    37  }
    38  
    39  func setsockoptGroupSourceReq(fd int, opt *sockOpt, ifi *net.Interface, grp, src net.IP) error {
    40  	var gsr sysGroupSourceReq
    41  	if ifi != nil {
    42  		gsr.Interface = uint32(ifi.Index)
    43  	}
    44  	gsr.setSourceGroup(grp, src)
    45  	var p unsafe.Pointer
    46  	var l sysSockoptLen
    47  	if freebsd32o64 {
    48  		var d [sysSizeofGroupSourceReq + 4]byte
    49  		s := (*[sysSizeofGroupSourceReq]byte)(unsafe.Pointer(&gsr))
    50  		copy(d[:4], s[:4])
    51  		copy(d[8:], s[4:])
    52  		p = unsafe.Pointer(&d[0])
    53  		l = sysSizeofGroupSourceReq + 4
    54  	} else {
    55  		p = unsafe.Pointer(&gsr)
    56  		l = sysSizeofGroupSourceReq
    57  	}
    58  	return os.NewSyscallError("setsockopt", setsockopt(fd, opt.level, opt.name, p, l))
    59  }