mirror of
https://github.com/seaweedfs/seaweedfs.git
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81 lines
2.4 KiB
Go
81 lines
2.4 KiB
Go
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Windows system calls.
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package os_overloads
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import (
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"syscall"
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"unsafe"
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"golang.org/x/sys/windows"
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)
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// windows api calls
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//sys CreateFile(name *uint16, access uint32, mode uint32, sa *SecurityAttributes, createmode uint32, attrs uint32, templatefile int32) (handle Handle, err error) [failretval==InvalidHandle] = CreateFileW
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func makeInheritSa() *syscall.SecurityAttributes {
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var sa syscall.SecurityAttributes
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sa.Length = uint32(unsafe.Sizeof(sa))
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sa.InheritHandle = 1
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return &sa
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}
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// opens the
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func Open(path string, mode int, perm uint32, setToTempAndDelete bool) (fd syscall.Handle, err error) {
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if len(path) == 0 {
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return syscall.InvalidHandle, windows.ERROR_FILE_NOT_FOUND
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}
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pathp, err := syscall.UTF16PtrFromString(path)
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if err != nil {
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return syscall.InvalidHandle, err
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}
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var access uint32
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switch mode & (windows.O_RDONLY | windows.O_WRONLY | windows.O_RDWR) {
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case windows.O_RDONLY:
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access = windows.GENERIC_READ
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case windows.O_WRONLY:
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access = windows.GENERIC_WRITE
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case windows.O_RDWR:
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access = windows.GENERIC_READ | windows.GENERIC_WRITE
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}
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if mode&windows.O_CREAT != 0 {
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access |= windows.GENERIC_WRITE
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}
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if mode&windows.O_APPEND != 0 {
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access &^= windows.GENERIC_WRITE
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access |= windows.FILE_APPEND_DATA
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}
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sharemode := uint32(windows.FILE_SHARE_READ | windows.FILE_SHARE_WRITE)
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var sa *syscall.SecurityAttributes
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if mode&windows.O_CLOEXEC == 0 {
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sa = makeInheritSa()
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}
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var createmode uint32
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switch {
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case mode&(windows.O_CREAT|windows.O_EXCL) == (windows.O_CREAT | windows.O_EXCL):
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createmode = windows.CREATE_NEW
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case mode&(windows.O_CREAT|windows.O_TRUNC) == (windows.O_CREAT | windows.O_TRUNC):
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createmode = windows.CREATE_ALWAYS
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case mode&windows.O_CREAT == windows.O_CREAT:
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createmode = windows.OPEN_ALWAYS
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case mode&windows.O_TRUNC == windows.O_TRUNC:
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createmode = windows.TRUNCATE_EXISTING
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default:
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createmode = windows.OPEN_EXISTING
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}
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var h syscall.Handle
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var e error
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if setToTempAndDelete {
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h, e = syscall.CreateFile(pathp, access, sharemode, sa, createmode, (windows.FILE_ATTRIBUTE_TEMPORARY | FILE_FLAG_DELETE_ON_CLOSE), 0)
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} else {
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h, e = syscall.CreateFile(pathp, access, sharemode, sa, createmode, windows.FILE_ATTRIBUTE_NORMAL, 0)
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}
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return h, e
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}
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