bastion 0.53.2

client-go/filelock_windows.go

@@ -0,0 +1,25 @@
+//go:build windows
+
+package main
+
+import (
+	"os"
+
+	"golang.org/x/sys/windows"
+)
+
+// flockFile takes an exclusive lock on f (blocking) via LockFileEx. Released
+// by closing f (Windows releases file locks with the handle).
+func flockFile(f *os.File) error {
+	var ol windows.Overlapped
+	return windows.LockFileEx(windows.Handle(f.Fd()), windows.LOCKFILE_EXCLUSIVE_LOCK, 0, 1, 0, &ol)
+}
+
+// flockFileNB is flockFile without the wait — LOCKFILE_FAIL_IMMEDIATELY. Present
+// so the package builds on Windows; the singleton itself is Linux-only today
+// (singleton.go).
+func flockFileNB(f *os.File) error {
+	var ol windows.Overlapped
+	return windows.LockFileEx(windows.Handle(f.Fd()),
+		windows.LOCKFILE_EXCLUSIVE_LOCK|windows.LOCKFILE_FAIL_IMMEDIATELY, 0, 1, 0, &ol)
+}