// Copyright 2024 The Prometheus Authors // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. package fileutil import ( "bufio" "errors" "os" ) var errDirectIOUnsupported = errors.New("direct IO is unsupported") type BufWriter interface { Write([]byte) (int, error) Flush() error Reset(f *os.File) error } // writer is a specialized wrapper around bufio.Writer. // It is used when Direct IO isn't enabled, as using directIOWriter in such cases is impractical. type writer struct { *bufio.Writer } func (b *writer) Reset(f *os.File) error { b.Writer.Reset(f) return nil }