Re: printf 3
From: Michael Kerrisk <hidden>
Date: 2011-10-04 05:46:21
Possibly related (same subject, not in this thread)
- 2011-10-05 · Re: printf 3 · Michael Kerrisk <hidden>
- 2011-10-05 · Re: printf 3 · Jon Grant <hidden>
- 2011-10-03 · printf 3 · Jon Grant <hidden>
Hi Jon, On Tue, Oct 4, 2011 at 1:58 AM, Jon Grant [off-list ref] 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/ -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html