Change the c code to the go code

[Bidhan (Bidhan Bastola)]

Can you please change this C code to go code ?

#include <stdio.h>
#include <string.h>

float get_cpu_clock_speed () {

FILE* fp ;
char buffer [1024];
size_t bytes_read;
char* match ;
float clock_speed ;

fp = fopen ("/proc/cpuinfo", "r");
bytes_read = fread(buffer, 1, sizeof (buffer), fp);
fclose (fp);

if (bytes_read == 0 || bytes_read == sizeof (buffer))
	return 0;

buffer[bytes_read] = ’\0’;
match = strstr (buffer, "cpu MHz");
if (match == NULL)
	return 0;
sscanf (match, "cpu MHz : %f", &clock_speed);
return clock_speed;

}

int main()
{
printf(“CPU clock speed: %4.0f MHz\n”, get_cpu_clock_speed() );
return 0;
}

[lutzhorn]

No.

Please first describe what this C code is doing. And then show us what you have tried to convert it to Go. Does your code work? If not, how does it fail?

[Bidhan (Bidhan Bastola)]

This code is retreiving the information about the cpu that is created on /proc/cpuinfo filesystem in Linux where the line starts with cpu MHz.

func get_cpu_clock_speed () {
file, err := os.Open(/proc/cpuinfo)
if err != nil {
log.Fatal(err)
}
defer file.Close()

buf := make([]byte, 1024)
for {
	n, err := file.Read(buf)
	if err != nil && err != io.EOF {
		panic(err)
	}
	if n==0 {
		break
	}

}

This is all i tried to convert it.
How can i extract the information from that file system and store it in buffer so that i can use it to get the line started with cpu MHz.

[lutzhorn]

So you basically want to execute this?

$ cat /proc/cpuinfo | grep 'cpu MHz'
cpu MHz         : 800.000
cpu MHz         : 800.000
cpu MHz         : 800.000
cpu MHz         : 800.000

[Bidhan (Bidhan Bastola)]

i am working on a project to make monitoring tool. So in /proc/cpuinfo i want to extract the information where the line starts with vendor_id, model name , cpu MHz and so on
I am also new for go programming language. So i was wondering if you could help me

[lutzhorn]

Try this:

package main

import (
	"bufio"
	"fmt"
	"log"
	"os"
	"strings"
)

func main() {
	// Open /proc/cpuinfo for reading, close it after we are done.
	file, err := os.Open("/proc/cpuinfo")
	if err != nil {
		log.Fatal(err)
	}
	defer file.Close()

	// Create a scanner that reads line by line.
	scanner := bufio.NewScanner(file)

	// Iterate over the lines.
	for scanner.Scan() {
		line := scanner.Text()

		// If the line has the prefix "cpu MHz", print the line.
		if strings.HasPrefix(line, "cpu MHz") {
			fmt.Println(line)
		}
	}

	if err := scanner.Err(); err != nil {
		log.Fatal(err)
	}
}

[Bidhan (Bidhan Bastola)]

It works
Thank you so much

[lutzhorn]

I hope you understand what the code does. Take a look at the package documentation for a description of what the functions I use do.

[Bidhan (Bidhan Bastola)]

Can you please help me with parsing the uptime value from proc file system which is updated in every 5 second??

[lutzhorn]

Do you mean this?

$ cat /proc/uptime
334147.08 464782.69

[Bidhan (Bidhan Bastola)]

Yes… Can you please help me to write a go code to extract it which will be updated in every 5 sec

[lutzhorn]

Please open a new topic about this.

Please include the Go code you have tried and describe what information you want to get from /proc/uptime.

[Bidhan (Bidhan Bastola)]

Extract the uptime information from proc file system in linux using Go
This is the new topic for the discussion
Please review it