等待一个非子进程结束

Question

Hi I am working on a simple code that will monitor a process and restart the process in case the process crashes. I have written a small sample code.

This is my external process

package main

import (
    "fmt"
    "time"
)

func main() {
    for {
        time.Sleep(1000 * time.Millisecond)
        fmt.Println("hello")
    }
}

This is the code that monitors it.

package main

import (
    "fmt"
    "os"
)

func main() {
    p, e := os.FindProcess(<processid>)
    fmt.Println(e)
    fmt.Println(p.Wait())
    fmt.Println("done")
}

The challenge here is that since the first process is not a child process of the second one, it does not wait and directly exits. Please let me know if anyone has any ideas around this.

Thanks.

Answer 1

Monitoring process exits because p.Wait() does not block.

From the docs:

On most operating systems, the Process must be a child of the current process or an error will be returned.

You can perhaps poll the process pool to check if the process still exists.