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分享看了下os.Exit的代码，当code为0时可以执行某些函数？
```
func Exit(code int) {
if code == 0 {
// Give race detector a chance to fail the program.
// Racy programs do not have the right to finish successfully.
runtime_beforeExit()
}
syscall.Exit(code)
}
func runtime_beforeExit() // implemented in runtime
```
看了源代码，当code为0时，执行runtime_beforeExit()函数，而runtime_beforeExit()函数又没有定义什么功能，我能自定义这个函数吗
func Exit(code int) {
if code == 0 {
// Give race detector a chance to fail the program.
// Racy programs do not have the right to finish successfully.
runtime_beforeExit()
}
syscall.Exit(code)
}
func runtime_beforeExit() // implemented in runtime
```
看了源代码，当code为0时，执行runtime_beforeExit()函数，而runtime_beforeExit()函数又没有定义什么功能，我能自定义这个函数吗
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