Zabbix

//go:build linux

// +build linux

​

/*

** Zabbix

** Copyright (C) 2001-2025 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 proc

​

import (

    "bytes"

    "fmt"

    "io"

    "os"

    "strconv"

    "strings"

    "syscall"

​

    "golang.zabbix.com/agent2/pkg/procfs"

)

​

func read2k(filename string) (data []byte, err error) {

    fd, err := syscall.Open(filename, syscall.O_RDONLY, 0)

    if err != nil {

        return

    }

    var n int

    b := make([]byte, 2048)

    if n, err = syscall.Read(fd, b); err == nil {

        data = b[:n]

    }

    syscall.Close(fd)

    return

}

​

func getProcessName(pid string) (name string, err error) {

    var data []byte

    if data, err = read2k("/proc/" + pid + "/stat"); err != nil {

        return

    }

    var left, right int

    if right = bytes.LastIndexByte(data, ')'); right == -1 {

        return "", fmt.Errorf("cannot find process name ending position in /proc/%s/stat", pid)

    }

    if left = bytes.IndexByte(data[:right], '('); left == -1 {

        return "", fmt.Errorf("cannot find process name starting position in /proc/%s/stat", pid)

    }

    return string(data[left+1 : right]), nil