67 lines
2.2 KiB
Go
67 lines
2.2 KiB
Go
//+build windows
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package file
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import (
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"os"
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"syscall"
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)
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// OpenFile is the generalized open call; most users will use Open or Create
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// instead. It opens the named file with specified flag (O_RDONLY etc.) and
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// perm (before umask), if applicable. If successful, methods on the returned
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// File can be used for I/O. If there is an error, it will be of type
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// *PathError.
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//
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// Under both Unix and Windows this will allow open files to be
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// renamed and or deleted.
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func OpenFile(path string, mode int, perm os.FileMode) (*os.File, error) {
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// This code copied from syscall_windows.go in the go source and then
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// modified to support renaming and deleting open files by adding
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// FILE_SHARE_DELETE.
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//
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// https://docs.microsoft.com/en-us/windows/desktop/api/fileapi/nf-fileapi-createfilea#file_share_delete
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if len(path) == 0 {
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return nil, syscall.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 nil, err
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}
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var access uint32
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switch mode & (syscall.O_RDONLY | syscall.O_WRONLY | syscall.O_RDWR) {
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case syscall.O_RDONLY:
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access = syscall.GENERIC_READ
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case syscall.O_WRONLY:
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access = syscall.GENERIC_WRITE
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case syscall.O_RDWR:
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access = syscall.GENERIC_READ | syscall.GENERIC_WRITE
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}
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if mode&syscall.O_CREAT != 0 {
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access |= syscall.GENERIC_WRITE
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}
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if mode&syscall.O_APPEND != 0 {
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access &^= syscall.GENERIC_WRITE
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access |= syscall.FILE_APPEND_DATA
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}
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sharemode := uint32(syscall.FILE_SHARE_READ | syscall.FILE_SHARE_WRITE | syscall.FILE_SHARE_DELETE)
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var createmode uint32
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switch {
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case mode&(syscall.O_CREAT|syscall.O_EXCL) == (syscall.O_CREAT | syscall.O_EXCL):
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createmode = syscall.CREATE_NEW
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case mode&(syscall.O_CREAT|syscall.O_TRUNC) == (syscall.O_CREAT | syscall.O_TRUNC):
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createmode = syscall.CREATE_ALWAYS
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case mode&syscall.O_CREAT == syscall.O_CREAT:
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createmode = syscall.OPEN_ALWAYS
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case mode&syscall.O_TRUNC == syscall.O_TRUNC:
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createmode = syscall.TRUNCATE_EXISTING
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default:
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createmode = syscall.OPEN_EXISTING
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}
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h, e := syscall.CreateFile(pathp, access, sharemode, nil, createmode, syscall.FILE_ATTRIBUTE_NORMAL, 0)
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if e != nil {
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return nil, e
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}
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return os.NewFile(uintptr(h), path), nil
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}
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