cpuinfo_linux.go

Documentation: internal/sysinfo

     1  // Copyright 2023 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package sysinfo
     6  
     7  import (
     8  	"bufio"
     9  	"bytes"
    10  	"io"
    11  	"os"
    12  	"strings"
    13  )
    14  
    15  func readLinuxProcCPUInfo(buf []byte) error {
    16  	f, err := os.Open("/proc/cpuinfo")
    17  	if err != nil {
    18  		return err
    19  	}
    20  	defer f.Close()
    21  
    22  	_, err = io.ReadFull(f, buf)
    23  	if err != nil && err != io.ErrUnexpectedEOF {
    24  		return err
    25  	}
    26  
    27  	return nil
    28  }
    29  
    30  func osCpuInfoName() string {
    31  	modelName := ""
    32  	cpuMHz := ""
    33  
    34  	// The 512-byte buffer is enough to hold the contents of CPU0
    35  	buf := make([]byte, 512)
    36  	err := readLinuxProcCPUInfo(buf)
    37  	if err != nil {
    38  		return ""
    39  	}
    40  
    41  	scanner := bufio.NewScanner(bytes.NewReader(buf))
    42  	for scanner.Scan() {
    43  		line := scanner.Text()
    44  		if !strings.Contains(line, ":") {
    45  			continue
    46  		}
    47  
    48  		field := strings.SplitN(line, ": ", 2)
    49  		switch strings.TrimSpace(field[0]) {
    50  		case "Model Name", "model name":
    51  			modelName = field[1]
    52  		case "CPU MHz", "cpu MHz":
    53  			cpuMHz = field[1]
    54  		}
    55  	}
    56  
    57  	if modelName == "" {
    58  		return ""
    59  	}
    60  
    61  	if cpuMHz == "" {
    62  		return modelName
    63  	}
    64  
    65  	// The modelName field already contains the frequency information,
    66  	// so the cpuMHz field information is not needed.
    67  	// modelName filed example:
    68  	//	Intel(R) Core(TM) i7-10700 CPU @ 2.90GHz
    69  	f := [...]string{"GHz", "MHz"}
    70  	for _, v := range f {
    71  		if strings.Contains(modelName, v) {
    72  			return modelName
    73  		}
    74  	}
    75  
    76  	return modelName + " @ " + cpuMHz + "MHz"
    77  }
    78
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