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glfw: Create a DLL file atomically by renaming the file

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Fixes #1393
This commit is contained in:
Hajime Hoshi 2020-11-02 03:22:30 +09:00
parent 3276c57976
commit b9907c03fa
1 changed files with 24 additions and 13 deletions
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37
internal/glfw/load_windows.go
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@ -46,6 +46,25 @@ func (d *dll) call(name string, args ...uintptr) uintptr {
return r
}
func writeDLLFile(name string) error {
f, err := gzip.NewReader(bytes.NewReader(glfwDLLCompressed))
if err != nil {
return err
}
defer f.Close()
out, err := os.Create(name)
if err != nil {
return err
}
defer out.Close()
if _, err := io.Copy(out, f); err != nil {
return err
}
return nil
}
func loadDLL() (*dll, error) {
cachedir, err := os.UserCacheDir()
if err != nil {
@ -63,22 +82,14 @@ func loadDLL() (*dll, error) {
return nil, err
}
f, err := gzip.NewReader(bytes.NewReader(glfwDLLCompressed))
if err != nil {
// Create a DLL as a temporary file and then rename it later.
// Without the temporary file, writing a DLL might fail in the process of writing and Ebiten cannot
// notice that the DLL file is incomplete.
if err := writeDLLFile(fn + ".tmp"); err != nil {
return nil, err
}
defer f.Close()
out, err := os.Create(fn)
if err != nil {
return nil, err
}
defer out.Close()
if _, err := io.Copy(out, f); err != nil {
return nil, err
}
if err := out.Sync(); err != nil {
if err := os.Rename(fn+".tmp", fn); err != nil {
return nil, err
}
}