text: // Copyright 2009 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 amd64,dragonfly
  
  package unix
  
  import (
  	"syscall"
  	"unsafe"
  )
  
  func Getpagesize() int { return 4096 }
  
  func TimespecToNsec(ts Timespec) int64 { return int64(ts.Sec)*1e9 + int64(ts.Nsec) }
  
  func NsecToTimespec(nsec int64) (ts Timespec) {
  	ts.Sec = nsec / 1e9
  	ts.Nsec = nsec % 1e9
  	return
  }
  
  func NsecToTimeval(nsec int64) (tv Timeval) {
  	nsec += 999 // round up to microsecond
  	tv.Usec = nsec % 1e9 / 1e3
  	tv.Sec = int64(nsec / 1e9)
  	return
  }
  
  func SetKevent(k *Kevent_t, fd, mode, flags int) {
  	k.Ident = uint64(fd)
  	k.Filter = int16(mode)
  	k.Flags = uint16(flags)
  }
  
  func (iov *Iovec) SetLen(length int) {
  	iov.Len = uint64(length)
  }
  
  func (msghdr *Msghdr) SetControllen(length int) {
  	msghdr.Controllen = uint32(length)
  }
  
  func (cmsg *Cmsghdr) SetLen(length int) {
  	cmsg.Len = uint32(length)
  }
  
  func sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
  	var writtenOut uint64 = 0
  	_, _, e1 := Syscall9(SYS_SENDFILE, uintptr(infd), uintptr(outfd), uintptr(*offset), uintptr(count), 0, uintptr(unsafe.Pointer(&writtenOut)), 0, 0, 0)
  
  	written = int(writtenOut)
  
  	if e1 != 0 {
  		err = e1
  	}
  	return
  }
  
  func Syscall9(num, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr, err syscall.Errno)
  