How Can I Execute Code When a Go Program Terminates?

Executing Code on Program Termination in Go

While Go allows defining init functions that execute before the main function, there is no built-in mechanism to execute code at program termination.

Why atexit was Not Adopted in Go

The Go development team considered adopting the C atexit functionality but rejected the idea. These are some of the reasons:

• Potential hang-ups in multi-threaded, long-running server programs due to the need to run global destructors that may not be immediately required.
• Introduction of additional threads of control and potential interference if the program terminates while holding a lock.

Alternatives to os.AtExit

The recommended approach is to use a wrapper program that invokes the target program and performs cleanup tasks upon completion. This approach provides full reliability regardless of how the program exits.

Another option is to define a special "exit" function similar to the init function. However, this approach has limitations and will not work if the program is killed by the kernel or experiences a crash.

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