Re: [PATCH v2] daemon: correctly handle soft accept() errors in service_loop

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Hridoy Ahmed

> On 28 Jun 2025, at 2:06 AM, Carlo Marcelo Arenas Belón <carenas@xxxxxxxxx> wrote:
> 
> On Fri, Jun 27, 2025 at 01:19:18PM -0800, Junio C Hamano wrote:
>> Carlo Marcelo Arenas Belón <carenas@xxxxxxxxx> writes:
>> 
>>> On Fri, Jun 27, 2025 at 09:38:47AM -0800, Phillip Wood wrote:
>>>> 
>>>>> On 26/06/2025 18:21, Carlo Marcelo Arenas Belón wrote:
>>>>>> 
>>>>>> diff --git a/daemon.c b/daemon.c
>>>>>> index d1be61fd57..f113839781 100644
>>>>>> --- a/daemon.c
>>>>>> +++ b/daemon.c
>>>>>> @@ -1145,6 +1145,7 @@ static int service_loop(struct socketlist *socklist)
>>>>>>          for (size_t i = 0; i < socklist->nr; i++) {
>>>>>>              if (pfd[i].revents & POLLIN) {
>>>>>> +                int incoming;
>>>>>>                  union {
>>>>>>                      struct sockaddr sa;
>>>>>>                      struct sockaddr_in sai;
>>>>>> @@ -1153,11 +1154,19 @@ static int service_loop(struct socketlist *socklist)
>>>>>>  #endif
>>>>>>                  } ss;
>>>>>>                  socklen_t sslen = sizeof(ss);
>>>>>> -                int incoming = accept(pfd[i].fd, &ss.sa, &sslen);
>>>>> 
>>>>> Why is the declaration of incoming moved but retry is declared here?
>>> 
>>> Separating the declaration and assignment for incoming is needed so we can
>>> insert a label for goto; moving it up just removes distractions so the rest
>>> of the logic is clearly in view.
>>> 
>>> Obviously that includes the definition and assignment for retry.
>>> 
>>> How would you suggest to arrange this better?
>> 
>> I think what Phillip meant was more like this, perhaps.
>> 
>>        socklen_t sslen = sizeof(ss);
>> -        int incoming = accept(pfd[i].fd, &ss.sa, &sslen);
>> +        int incoming;
>> +        int retry = 3;
>> +
>> +        incoming = accept(pfd[i].fd, &ss.sa, &sslen);
>>        if (incoming < 0) {
>>            ...
> 
> That seems unnecessarily restrictive just to minimize churn and leaves the
> deflaration of incoming strangely sitting in between two assignments, which
> while it doesn't trigger -Wdeclaration-after-statement seems to go against
> its spirit.
> 
> Will include in a v3 with all other suggestions, but frankly think that the
> original was overall cleaner.
> 
> Carlo
> 





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