Re: timegm(3): behavior is not described in case of error

["Michael Kerrisk (man-pages)" <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

Hello Vincent,

On 10/25/2016 06:58 AM, Vincent Lefevre wrote:
> In the timegm(3) man page, the behavior is not described in case of
> error, i.e. if the result is not representable in a time_t (e.g.,
> with a huge year).
> 
> The glibc manual says:
> 
>      'timegm' is functionally identical to 'mktime' except it always
>      takes the input values to be Coordinated Universal Time (UTC)
>      regardless of any local time zone setting.
> 
> So, I assume that (time_t) -1 is returned in such a case, just like
> mktime.

Yes.

> The man page could add a sentence like the glibc manual one, or
> explicitly say what happens in case of error like in the mktime(3)
> man page.

I've added such a sentence. (Changes are pushed to Git.) 
Thanks for the report!

Cheers,

Michael

> This is mainly for the timegm() function. For the timelocal() function,
> the man page already says:
> 
>     The timelocal() function is equivalent to the POSIX standard
>     function mktime(3). [...]
> 


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
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