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Re: Confusing "Success" error message
From: |
Tim Rühsen |
Subject: |
Re: Confusing "Success" error message |
Date: |
Fri, 8 Nov 2019 15:50:43 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 |
On 11/8/19 3:03 PM, Andries E. Brouwer wrote:
> On Fri, Nov 08, 2019 at 09:55:48AM +0100, Tim Rühsen wrote:
>> On 11/8/19 12:03 AM, Andries E. Brouwer wrote:
>
>>> The hope is probably that errno is the errno from gethttp.
>>> But does time() preserve errno?
>>> And does datetime_str() preserve errno?
>>> It calls fmttime() which calls localtime() and strftime().
>>
>> Libc functions only touch errno if there *is* an error
>
> Libc functions are free to call other functions internally,
> and such internal calls may fail where the outer level call
> does not fail. So even if a libc function does not return
> an error, errno can have changed.
> If it is needed later, errno should be saved immediately after a
> failing system call.
>
> In this particular case I see
>
> % man localtime
> ERRORS
> EOVERFLOW
> The result cannot be represented.
>
> so under unusual circumstances datetime_str() can change errno.
Sure it does - but never to 0 (Success). And that is what the OP is
reporting.
Regards, Tim
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- Re: Confusing "Success" error message, (continued)
- Re: Confusing "Success" error message, Andries E. Brouwer, 2019/11/07
- Re: Confusing "Success" error message, Tim Rühsen, 2019/11/08
- Re: Confusing "Success" error message, Francesco Turco, 2019/11/08
- Re: Confusing "Success" error message, Francesco Turco, 2019/11/08
- Re: Confusing "Success" error message, Andries E. Brouwer, 2019/11/08
- Re: Confusing "Success" error message, Eli Zaretskii, 2019/11/08
- Re: Confusing "Success" error message, Andries E. Brouwer, 2019/11/08
- Re: Confusing "Success" error message, Eli Zaretskii, 2019/11/08
- Re: Confusing "Success" error message, Andries E. Brouwer, 2019/11/08
- Re: Confusing "Success" error message, Eli Zaretskii, 2019/11/08
- Re: Confusing "Success" error message,
Tim Rühsen <=
- Re: Confusing "Success" error message, Andries E. Brouwer, 2019/11/08