Is there a way to get "EINVAL" style string

[Jon Grant <jg-hus3n9K41k0@public.gmane.org>]

Hello

I was looking at the man pages looking for a way to get a string of the 
errno value meaning. This is kind of a user question.

This API returns "returns a pointer to a string that describes the error 
code":

http://man7.org/linux/man-pages/man3/strerror.3.html

However, this is a description, e.g. "Invalid argument".  Is there a 
function that would return "EINVAL" or "ENOENT" as the string?

Could I suggest that the text on the man page be updated to clarify what 
would be returned:

"returns a pointer to a string that describes the error code. e.g. 
"Invalid argument" if EINVAL was the errnum."

Best regards, Jon
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