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