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Source file src/github.com/prometheus/procfs/internal/util/readfile.go

Documentation: github.com/prometheus/procfs/internal/util

     1  // Copyright 2019 The Prometheus Authors
     2  // Licensed under the Apache License, Version 2.0 (the "License");
     3  // you may not use this file except in compliance with the License.
     4  // You may obtain a copy of the License at
     5  //
     6  // http://www.apache.org/licenses/LICENSE-2.0
     7  //
     8  // Unless required by applicable law or agreed to in writing, software
     9  // distributed under the License is distributed on an "AS IS" BASIS,
    10  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package util
    15  
    16  import (
    17  	"io"
    18  	"os"
    19  )
    20  
    21  // ReadFileNoStat uses io.ReadAll to read contents of entire file.
    22  // This is similar to os.ReadFile but without the call to os.Stat, because
    23  // many files in /proc and /sys report incorrect file sizes (either 0 or 4096).
    24  // Reads a max file size of 1024kB.  For files larger than this, a scanner
    25  // should be used.
    26  func ReadFileNoStat(filename string) ([]byte, error) {
    27  	const maxBufferSize = 1024 * 1024
    28  
    29  	f, err := os.Open(filename)
    30  	if err != nil {
    31  		return nil, err
    32  	}
    33  	defer f.Close()
    34  
    35  	reader := io.LimitReader(f, maxBufferSize)
    36  	return io.ReadAll(reader)
    37  }
    38  

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