退出时出现错误代码？ [英] Exit with error code in go?

问题描述

退出的文档说明程序立即终止，延迟功能不运行。和log.Fatal只是调用Exit。对于不是令人发指的错误，终止程序而不运行延迟的功能似乎是极端的。

我应该传递一些状态，表示出现错误，然后在某个点我知道我可以安全地退出所有延迟的函数已经运行了，然后调用Exit（1）？

解决方案

p>我在大多数真正的主要包中按照这些方式做了一些事情，所以采用 return err 约定尽快，并且正确终止：

  func main（）{
 if err：= run ）; err！= nil {
 fmt.Fprintf（os.Stderr，error：％v\\\
，err）
 os.Exit（1）
} 
} 
 
 func run（）error {
 err：= something（）
 if err！= nil {
 return err 
} 
 // etc 
} 
  

What's the idiomatic way to exit a program with some error code?

The documentation for Exit says "The program terminates immediately; deferred functions are not run.", and log.Fatal just calls Exit. For things that aren't heinous errors, terminating the program without running deferred functions seems extreme.

Am I supposed to pass around some state that indicate that there's been an error, and then call Exit(1) at some point where I know that I can exit safely, with all deferred functions having been run?

解决方案

I do something along these lines in most of my real main packages, so that the return err convention is adopted as soon as possible, and has a proper termination:

func main() {
    if err := run(); err != nil {
        fmt.Fprintf(os.Stderr, "error: %v\n", err)
        os.Exit(1)
    }
}

func run() error {
    err := something()
    if err != nil {
        return err
    }
    // etc
}

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