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From: Keith Thompson <kst-u@mib.org>
Newsgroups: comp.lang.c
Subject: Re: How to read a data file whose size is unknown in C?
Date: Sun, 16 Aug 2015 17:28:19 -0700
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Robert Wessel <robertwessel2@yahoo.com> writes:
[...]
> Actually MS is very clear that fileno(), without the underscore, is
> depreciated:

Deprecated.

> https://msdn.microsoft.com/en-us/library/ms235401(v=vs.140).aspx

Which says:

    This POSIX function is deprecated. Use the ISO C++ conformant
    _fileno instead.

fileno() is declared in <stdio.h>, but is not specified by ISO C
(or C++), so a conforming implementation cannot define it there.
But POSIX defines a mechanism (defining one of several macros, such
as _POSIX_C_SOURCE) that lets fileno() be declared in <stdio.h>
without violating any ISO C rules.

Microsoft apparently has decided that using reserved names for
POSIX-like functions is a better approach -- which strikes me as
quite arrogant.  (The "P" in POSIX standard for "Portable".)

Personally I would have preferred it if *all* POSIX-specific
functions were declared in POSIX-specific headers, but POSIX had
to deal with a great deal of existing practice.

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
Working, but not speaking, for JetHead Development, Inc.
"We must do something.  This is something.  Therefore, we must do this."
    -- Antony Jay and Jonathan Lynn, "Yes Minister"