[Bug 206146] fileno(3) should be implemented as a function; need to check other functions as well

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206146

            Bug ID: 206146
           Summary: fileno(3) should be implemented as a function; need to
                    check other functions as well
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: standards
          Assignee: freebsd-standards at FreeBSD.org
          Reporter: delphij at FreeBSD.org

Currently, fileno(3) is implemented as a macro in stdio.h:

#define fileno(p)       (!__isthreaded ? __sfileno(p) : (fileno)(p))

Per discussion with lichray, because this is a macro, it could cause namespace
collision with C++ programs that uses the same name, and that could potentially
a problem when porting applications to FreeBSD.

POSIX, on the other hand, defines fileno as a function.

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