hunk.code_window: 	// prevent file links from being embedded in iframes
   	w.Header().Set("X-Frame-Options", "DENY")
   	w.Header().Set("Content-Security-Policy", "Frame-ancestors 'none'")
   	io.Copy(w, fileReader)
   	return nil
   }
hunk.labels: keep keep keep keep keep replace keep keep keep
hunk.after_edit: 	http.ServeContent(w, r, filename, lastModification, fileReader)
  
hunk.file_path: api4/file.go
hunk.type: replace
file: // Copyright 2014 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  
  // +build darwin freebsd linux
  
  package ipv4
  
  import (
  	"net"
  	"unsafe"
  
  	"golang.org/x/net/internal/socket"
  )
  
  func (so *sockOpt) getIPMreqn(c *socket.Conn) (*net.Interface, error) {
  	b := make([]byte, so.Len)
  	if _, err := so.Get(c, b); err != nil {
  		return nil, err
  	}
  	mreqn := (*ipMreqn)(unsafe.Pointer(&b[0]))
  	if mreqn.Ifindex == 0 {
  		return nil, nil
  	}
  	ifi, err := net.InterfaceByIndex(int(mreqn.Ifindex))
  	if err != nil {
  		return nil, err
  	}
  	return ifi, nil
  }
  
  func (so *sockOpt) setIPMreqn(c *socket.Conn, ifi *net.Interface, grp net.IP) error {
  	var mreqn ipMreqn
  	if ifi != nil {
  		mreqn.Ifindex = int32(ifi.Index)
  	}
  	if grp != nil {
  		mreqn.Multiaddr = [4]byte{grp[0], grp[1], grp[2], grp[3]}
  	}
  	b := (*[sizeofIPMreqn]byte)(unsafe.Pointer(&mreqn))[:sizeofIPMreqn]
  	return so.Set(c, b)
  }
  