Zabbix

/*

** Zabbix

** Copyright (C) 2001-2022 Zabbix SIA

**

** This program is free software; you can redistribute it and/or modify

** it under the terms of the GNU General Public License as published by

** the Free Software Foundation; either version 2 of the License, or

** (at your option) any later version.

**

** This program is distributed in the hope that it will be useful,

** but WITHOUT ANY WARRANTY; without even the implied warranty of

** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

** GNU General Public License for more details.

**

** You should have received a copy of the GNU General Public License

** along with this program; if not, write to the Free Software

** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

**/

​

package kernel

​

import (

    "bufio"

    "fmt"

    "strconv"

    "strings"

)

​

// getFirstNum  - get first number from file

func getFirstNum(key string) (max uint64, err error) {

    fileName := "/proc"

    switch key {

    case "kernel.maxproc":

        fileName += "/sys/kernel/pid_max"

    case "kernel.maxfiles":

        fileName += "/sys/fs/file-max"

    case "kernel.openfiles":

        fileName += "/sys/fs/file-nr"

    }

​

    file, err := stdOs.Open(fileName)

    if err == nil {

        var line []byte

        var long bool

​

        reader := bufio.NewReader(file)

​

        if line, long, err = reader.ReadLine(); err == nil && !long {

            if key == "kernel.openfiles" {

                max, err = strconv.ParseUint(strings.Split(string(line), "\t")[0], 10, 64)

            } else {

                max, err = strconv.ParseUint(string(line), 10, 64)

            }

        }

​

        file.Close()

    }

​

    if err != nil {

        err = fmt.Errorf("Cannot obtain data from %s.", fileName)

    }

​

    return