Undocumented behaviour - panic exiting with exit code 2?

[cachvico]

Curious why panic appears to exit with code 2 (https://golang.org/src/runtime/panic.go line 757)

I can't find any mention of this in the spec; this should probably be documented?

For example Supervisor treats exit codes 2 (and 0) as "expected" by default, which leads to processes not restarting on a Go panic.

Thanks,

Darren

[Rob Pike]

That's poor. Exit code 2 is supposed to mean 'incorrect arguments' in the Unix tradition.

Something like 127 or 255 would be better.

-rob

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[Rob Pike]

https://github.com/golang/go/issues/24284

[Ian Lance Taylor]

On Tue, Mar 6, 2018 at 3:55 PM, Rob Pike <r...@golang.org> wrote:
> That's poor. Exit code 2 is supposed to mean 'incorrect arguments' in the
> Unix tradition.
>
> Something like 127 or 255 would be better.

I think you actually set it to 2, back in June, 2008, in what is now
known as git revision aeb43984ec7c86aee220cc56146e0127de4ce2e3.

See the change to runtime.c in
https://github.com/golang/go/commit/aeb43984ec7c86aee220cc56146e0127de4ce2e3
.


I don't know what Supervisor is but if it is running on a Unix system
I don't think it should treat exit code 2 as success.

I don't think we should document the exit status of panic except to
say that it is non-zero.

Ian

> On Wed, Mar 7, 2018 at 10:39 AM, cachvico <darren....@gmail.com> wrote:
>>
>> Curious why panic appears to exit with code 2
>> (https://golang.org/src/runtime/panic.go line 757)
>>
>> I can't find any mention of this in the spec; this should probably be
>> documented?
>>
>> For example Supervisor treats exit codes 2 (and 0) as "expected" by
>> default, which leads to processes not restarting on a Go panic.
>>
>> Thanks,
>>
>> Darren
>>
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>
>

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[Rob Pike]

Largely in agreement. Moved the conversation to the bug.

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>
>
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