38 lines
999 B
Go
38 lines
999 B
Go
package checkpoint
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import (
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"os"
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"syscall"
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)
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const (
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_FILE_FLAG_WRITE_THROUGH = 0x80000000
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)
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func create(path string) (*os.File, error) {
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return createWriteThroughFile(path)
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}
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// createWriteThroughFile creates a file whose write operations do not go
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// through any intermediary cache, they go directly to disk.
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func createWriteThroughFile(path string) (*os.File, error) {
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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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h, err := syscall.CreateFile(
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pathp, // Path
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syscall.GENERIC_READ|syscall.GENERIC_WRITE, // Access Mode
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uint32(syscall.FILE_SHARE_READ|syscall.FILE_SHARE_WRITE), // Share Mode
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nil, // Security Attributes
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syscall.CREATE_ALWAYS, // Create Mode
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uint32(syscall.FILE_ATTRIBUTE_NORMAL|_FILE_FLAG_WRITE_THROUGH), // Flags and Attributes
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0) // Template File
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return os.NewFile(uintptr(h), path), err
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}
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