How to kill the child process when terminating the main process in Go language

php Xiaobian Yuzai will introduce to you how to kill the child process when terminating the main process in Go language. In development, we often encounter situations where we need to run multiple child processes at the same time. However, when the main process ends, if the child process is not terminated properly, resource leaks or other problems may result. Therefore, it is very important to master how to correctly kill the child process when terminating the main process in Go language. In the following article, we will introduce several common methods to achieve this goal and discuss their advantages and disadvantages.

Question content

I want to terminate the child process when the main process terminates.

I am using exec.Command() to run the child process

But the main process may be terminated with an unexpected error, so I want to make sure the child process is terminated as well.

How to archive in Go language?

Workaround

You may want to use commandcontext instead and cancel the context in main when the process is terminating. Here are two examples: the first is a simple demonstration of terminating a process after a short timeout, and the second is terminating a child process when the process catches an external termination signal from the operating system:

package main

import (
    "context"
    "os/exec"
    "time"
)

func main() {
    // terminate the command based on time.Duration
    ctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
    defer cancel()

    if err := exec.CommandContext(ctx, "sleep", "5").Run(); err != nil {
        // This will fail after 100 milliseconds. The 5 second sleep
        // will be interrupted.
    }

    // or use os signals to cancel the context
    ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt)
    defer stop()
}

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