github.com/graybobo/golang.org-package-offline-cache@v0.0.0-20200626051047-6608995c132f/x/net/ipv4/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 ipv4
     8  
     9  import (
    10  	"net"
    11  	"os"
    12  	"unsafe"
    13  
    14  	"golang.org/x/net/internal/iana"
    15  )
    16  
    17  var freebsd32o64 bool
    18  
    19  func setsockoptGroupReq(fd, name int, ifi *net.Interface, grp net.IP) error {
    20  	var gr sysGroupReq
    21  	if ifi != nil {
    22  		gr.Interface = uint32(ifi.Index)
    23  	}
    24  	gr.setGroup(grp)
    25  	var p unsafe.Pointer
    26  	var l sysSockoptLen
    27  	if freebsd32o64 {
    28  		var d [sysSizeofGroupReq + 4]byte
    29  		s := (*[sysSizeofGroupReq]byte)(unsafe.Pointer(&gr))
    30  		copy(d[:4], s[:4])
    31  		copy(d[8:], s[4:])
    32  		p = unsafe.Pointer(&d[0])
    33  		l = sysSizeofGroupReq + 4
    34  	} else {
    35  		p = unsafe.Pointer(&gr)
    36  		l = sysSizeofGroupReq
    37  	}
    38  	return os.NewSyscallError("setsockopt", setsockopt(fd, iana.ProtocolIP, name, p, l))
    39  }
    40  
    41  func setsockoptGroupSourceReq(fd, name int, ifi *net.Interface, grp, src net.IP) error {
    42  	var gsr sysGroupSourceReq
    43  	if ifi != nil {
    44  		gsr.Interface = uint32(ifi.Index)
    45  	}
    46  	gsr.setSourceGroup(grp, src)
    47  	var p unsafe.Pointer
    48  	var l sysSockoptLen
    49  	if freebsd32o64 {
    50  		var d [sysSizeofGroupSourceReq + 4]byte
    51  		s := (*[sysSizeofGroupSourceReq]byte)(unsafe.Pointer(&gsr))
    52  		copy(d[:4], s[:4])
    53  		copy(d[8:], s[4:])
    54  		p = unsafe.Pointer(&d[0])
    55  		l = sysSizeofGroupSourceReq + 4
    56  	} else {
    57  		p = unsafe.Pointer(&gsr)
    58  		l = sysSizeofGroupSourceReq
    59  	}
    60  	return os.NewSyscallError("setsockopt", setsockopt(fd, iana.ProtocolIP, name, p, l))
    61  }