golang query process name

Golang is a powerful programming language that supports low-level API calls for many operating systems. As a Golang programmer, you often need to manage and monitor processes running on the operating system. In this article, we will explore how to query process names using Golang.

1. Definition of process name

A process refers to a program being executed in the operating system. Each process has a unique process ID (PID) and a process name. The process name is the identifier of the process in the system, usually the name of the application. For example, "chrome.exe" in Windows systems represents a running instance of the Google Chrome browser.

In the Linux system, the process name is not only the name of the application, but also includes the status and other information of the process. For example, "sshd: user@pts/0" indicates a running SSH server process that is communicating with the operating terminal (pts/0) of the user named "user".

2. Query the process name

To query the name of the running process, we need to use Golang's os and syscall software packages. The syscall software package provides a system call interface that can access the underlying functions of the operating system.

1. Get the process ID

We can use Golang’s os software package to get the PID of the current process. The following is a sample code:

package main

import (
    "fmt"
    "os"
)

func main() {
    pid := os.Getpid()
    fmt.Printf("Current process ID: %d
", pid)
}

2. Use syscall to obtain the process name

We can use the Getpgid function of the syscall software package to obtain the PGID (Process Group ID) of the specified process. We can then use the stat file in the /proc file system to parse the name and status of the process.

The following is the sample code:

package main

import (
    "fmt"
    "os"
    "syscall"
)

func getProcessName(pid int) (string, error) {
    pgid, err := syscall.Getpgid(pid)
    if err != nil {
        return "", err
    }
    statFile := fmt.Sprintf("/proc/%d/stat", pgid)
    f, err := os.Open(statFile)
    if err != nil {
        return "", err
    }
    defer f.Close()
    var comm string
    fmt.Fscanf(f, "%d (%s)", &pgid, &comm)
    return comm, nil
}

func main() {
    pid := os.Getpid()
    name, err := getProcessName(pid)
    if err != nil {
        fmt.Println(err)
        return
    }
    fmt.Printf("PID %d, Process name: %s
", pid, name)
}

In the above code, we use the fmt.Fscanf function to read the name of the process from the stat file. This function is similar to the fmt.Scanf function, but allows us to specify a format string to read data.

When reading the process name, we need to use brackets to surround the name because there are brackets around the name in the stat file format.

3. Summary

In this article, we learned how to use Golang to query the process name. We use the os and syscall packages to get the PID of the current process and the PGID of the specified process, and then use the stat file in the /proc file system to parse the name and status.

The powerful functions of Golang allow us to more easily manage and monitor processes running on the operating system. If you want to further learn Golang's process management technology, you can check out relevant documents and tutorials, and refer to Golang official documentation and code examples.

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