use platform specific stat if available, fallback to generic stat

ctime_windows.go

@@ -16,8 +16,12 @@ type timespecEx struct {
 
 // StatFile finds a Windows Timespec with ChangeTime.
 func StatFile(file *os.File) (Timespec, error) {
+	return statFile(syscall.Handle(file.Fd()))
+}
+
+func statFile(h syscall.Handle) (Timespec, error) {
 	var fileInfo fileBasicInfo
-	if err := getFileInformationByHandleEx(syscall.Handle(file.Fd()), &fileInfo); err != nil {
+	if err := getFileInformationByHandleEx(h, &fileInfo); err != nil {
 		return nil, err
 	}
 
@@ -29,9 +33,10 @@ func StatFile(file *os.File) (Timespec, error) {
 	return t, nil
 }
 
-func Stat(name string) (Timespec, error) {
+const hasPlatformSpecificStat = true
+
+func platformSpecficStat(name string) (Timespec, error) {
 	if findProcErr != nil {
-		// fail fast, don't bother opening the file
 		return nil, findProcErr
 	}
 
@@ -40,7 +45,8 @@ func Stat(name string) (Timespec, error) {
 		return nil, err
 	}
 	defer f.Close()
-	return StatFile(f)
+
+	return statFile(syscall.Handle(f.Fd()))
 }
 
 var (

times.go

@@ -11,6 +11,21 @@ func Get(fi os.FileInfo) Timespec {
 	return getTimespec(fi)
 }
 
+// Stat returns the Timespec for the given filename.
+func Stat(name string) (Timespec, error) {
+	if hasPlatformSpecificStat {
+		if ts, err := platformSpecficStat(name); err == nil {
+			return ts, nil
+		}
+	}
+
+	fi, err := os.Stat(name)
+	if err != nil {
+		return nil, err
+	}
+	return getTimespec(fi), nil
+}
+
 // Timespec provides access to file times.
 // ChangeTime() panics unless HasChangeTime() is true and
 // BirthTime() panics unless HasBirthTime() is true.

use_generic_stat.go

@@ -0,0 +1,5 @@
+// +build !windows
+
+package times
+
+const hasPlatformSpecificStat = false