Re: NetBSD bug/misbehavior in vdprintf

[Rob Newberry <robthedude%mac.com@localhost>]

>>> NetBSD's implementation of vdprintf makes a special check -- if the
>>> descriptor is in non-blocking mode, it needs to be a regular file (I
>>> think I read that code correctly).  But it apparently doesn't have this
>>> check problem for vfprintf.  I think it's been there a long time (since
>>> the introduction of vdprintf), but it makes vdprintf behave differently
>>> than vfprintf.  In my view, "vfprintf( FILE, ...)" and "vdprintf(
>>> fileno( FILE ), ... )" ought to behave the same -- but they don't (on
>>> NetBSD) if "fileno( FILE )" has been marked non-blocking and it's not a
>>> regular file.
>> 
>> You are right, it should work and I removed the test.
> 
> Isn't the situation a bit more complicated? Normally, stdio will ensure
> data isn't just lost for non-blocking sockets on the blocking condition.
> But I don't think the whole dprintf interface allows dealing with error
> conditions in any sane way.

Is the interface any different for fprintf than dprintf?  Does fprintf (by virtue of having a FILE* instead of just a descriptor) have the ability to deal with those errors better?