48 lines
1.3 KiB
Go
48 lines
1.3 KiB
Go
// hd-idle - spin down idle hard disks
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// Copyright (C) 2018 Andoni del Olmo
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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 as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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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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package sgio
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import (
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"fmt"
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"github.com/benmcclelland/sgio"
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"os"
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"syscall"
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"unsafe"
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)
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const SgDxferNone = -1
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func openDevice(fname string) (*os.File, error) {
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f, err := os.OpenFile(fname, os.O_RDONLY, 0)
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if err != nil {
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return nil, err
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}
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var version uint32
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if (ioctl(f.Fd(), sgio.SG_GET_VERSION_NUM, uintptr(unsafe.Pointer(&version))) != nil) || (version < 30000) {
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return nil, fmt.Errorf("device does not appear to be an sg device")
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}
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return f, nil
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}
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func ioctl(fd, cmd, ptr uintptr) error {
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_, _, err := syscall.Syscall(syscall.SYS_IOCTL, fd, cmd, ptr)
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if err != 0 {
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return err
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}
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return nil
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}
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