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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2014-2015 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package osutil
import (
"os"
"syscall"
)
const maxint = int64(^uint(0) >> 1)
var maxcp = maxint // overridden in testing
func doCopyFile(fin, fout fileish, fi os.FileInfo) error {
size := fi.Size()
var offset int64
for offset < size {
// sendfile is funny; it only copies up to maxint
// bytes at a time, but takes an int64 offset.
count := size - offset
if count > maxcp {
count = maxcp
}
if _, err := syscall.Sendfile(int(fout.Fd()), int(fin.Fd()), &offset, int(count)); err != nil {
return err
}
}
return nil
}
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