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70 lines
2.4 KiB
70 lines
2.4 KiB
9 years ago
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// +build windows
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/*
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* Minio Cloud Storage, (C) 2015 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package disk
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import (
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"syscall"
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"unsafe"
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)
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// Stat returns total and free bytes available in a directory, e.g. `C:\`.
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// It returns free space available to the user (including quota limitations)
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//
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// https://msdn.microsoft.com/en-us/library/windows/desktop/aa364937(v=vs.85).aspx
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func Stat(path string) (total, free int64, err error) {
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kernel32, err := syscall.LoadLibrary("Kernel32.dll")
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if err != nil {
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return 0, 0, err
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}
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defer syscall.FreeLibrary(kernel32)
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// https://msdn.microsoft.com/en-us/library/windows/desktop/aa364937(v=vs.85).aspx
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// Retrieves information about the amount of space that is available on a disk volume,
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// which is the total amount of space, the total amount of free space, and the total
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// amount of free space available to the user that is associated with the calling thread.
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GetDiskFreeSpaceEx, err := syscall.GetProcAddress(syscall.Handle(kernel32), "GetDiskFreeSpaceExW")
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if err != nil {
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return 0, 0, err
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}
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lpFreeBytesAvailable := int64(0)
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lpTotalNumberOfBytes := int64(0)
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lpTotalNumberOfFreeBytes := int64(0)
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// Extract values safely
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// BOOL WINAPI GetDiskFreeSpaceEx(
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// _In_opt_ LPCTSTR lpDirectoryName,
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// _Out_opt_ PULARGE_INTEGER lpFreeBytesAvailable,
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// _Out_opt_ PULARGE_INTEGER lpTotalNumberOfBytes,
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// _Out_opt_ PULARGE_INTEGER lpTotalNumberOfFreeBytes
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// );
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r1, _, e1 := syscall.Syscall6(uintptr(GetDiskFreeSpaceEx), 4,
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uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(path))),
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uintptr(unsafe.Pointer(&lpFreeBytesAvailable)),
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uintptr(unsafe.Pointer(&lpTotalNumberOfBytes)),
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uintptr(unsafe.Pointer(&lpTotalNumberOfFreeBytes)), 0, 0)
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if e1 != 0 {
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return 0, 0, error(e1)
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}
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if r1 == 0 {
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return 0, 0, syscall.EINVAL
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}
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total = int64(lpTotalNumberOfBytes)
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free = int64(lpFreeBytesAvailable)
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return total, free, nil
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}
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