Re: printf 3

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Hi Jon,

On Tue, Oct 4, 2011 at 1:58 AM, Jon Grant <jg@xxxxxxxx> wrote:
> Hello
>
> Looking at this page:
> http://man7.org/linux/man-pages/online/pages/man3/printf.3.html
>
> "If an output error is encountered, a negative value is returned."
>
> I am thinking if this could be clarified. If I call printf(NULL), errno is
> set to EINVAL, and -1 is returned.
>
> Perhaps could be expanded to add:
>
> "If a parameter error is encountered, errno set to EINVAL, and -1 is
> returned. If an output error is encountered, errno set EIO and -1 returned.

The apparently vague wording is deliberate. Glibc may generally return
-1, but POSIX simply says "a negative value", and that's all that is
guaranteed to an application.

Cheers,

Michael


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Author of "The Linux Programming Interface"; http://man7.org/tlpi/
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