src/net/sendfile_unix_alt.go

// Copyright 2011 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 dragonfly freebsd solaris

package net

import (
	"internal/poll"
	"io"
	"os"
)

// sendFile copies the contents of r to c using the sendfile
// system call to minimize copies.
//
// if handled == true, sendFile returns the number of bytes copied and any
// non-EOF error.
//
// if handled == false, sendFile performed no work.
func sendFile(c *netFD, r io.Reader) (written int64, err error, handled bool) {
	// FreeBSD, DragonFly and Solaris use 0 as the "until EOF" value.
	// If you pass in more bytes than the file contains, it will
	// loop back to the beginning ad nauseam until it's sent
	// exactly the number of bytes told to. As such, we need to
	// know exactly how many bytes to send.
	var remain int64 = 0

	lr, ok := r.(*io.LimitedReader)
	if ok {
		remain, r = lr.N, lr.R
		if remain <= 0 {
			return 0, nil, true
		}
	}
	f, ok := r.(*os.File)
	if !ok {
		return 0, nil, false
	}

	if remain == 0 {
		fi, err := f.Stat()
		if err != nil {
			return 0, err, false
		}

		remain = fi.Size()
	}

	// The other quirk with FreeBSD/DragonFly/Solaris's sendfile
	// implementation is that it doesn't use the current position
	// of the file -- if you pass it offset 0, it starts from
	// offset 0. There's no way to tell it "start from current
	// position", so we have to manage that explicitly.
	pos, err := f.Seek(0, io.SeekCurrent)
	if err != nil {
		return 0, err, false
	}

	written, err = poll.SendFile(&c.pfd, int(f.Fd()), pos, remain)

	if lr != nil {
		lr.N = remain - written
	}
	return written, wrapSyscallError("sendfile", err), written > 0
}