<20091102203348.gc6...@calimero.vinschen.de> <4aef5b7c.90...@cygwin.com> Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0
> Date: Mon=2C 2 Nov 2009 17:21:48 -0500 > From: Larry Hall > Subject: Re: Shall dlopen("foo") succeeed if only "foo.dll" exists? > > On 11/02/2009 03:33 PM=2C Corinna Vinschen wrote: >> On Nov 2 14:17=2C Larry Hall (Cygwin) wrote: >>> On 11/02/2009 11:48 AM=2C Corinna Vinschen wrote: >>>> For 1.7 our choice is to keep dlopen() checking for the .dll suffix to >>>> be more Windows-like=2C or to be more Linux-like by dropping the check= for >>>> the .dll suffix so that dlopen() fails if the filename isn't specified >>>> fully. >>> >>> OK=2C I'll admit I'm responding with a question without actually lookin= g at the >>> code and so one can feel free to ignore me. However the thought that ca= me >>> to my mind is=2C should it really matter if dlopen() checks? What does = the check >>> give us that just passing the name along to LoadLibrary() doesn't? At f= irst >>> impression=2C doing the check just prematurely rejects names without >>> the DLL suffix >>> that would otherwise be accepted by Windows. Since there's a source >>> level change >>> that (typically) needs to happen to make the code work on Windows as op= posed >>> to Linux/Unix=2C what benefit are we getting from this added check? >> >> Good question=2C that's exactly why I'm asking. >> >> Answer: Nothing but *maybe* a less surprising behaviour in terms of >> POSIX compatibility. Allowing automatic file extension is not part of >> the standards and not even mentioned as a possible option. Sure=2C if >> that's nothing to worry about=2C we can stick to the current behaviour. > > Ah=2C now that's starting to ring a bell. OK=2C I understand why it was p= ut in. > > I guess I would come down on the side that we're stuck with Windows > implementation here (OK=2C not entirely true but...) so trying to circumv= ent > something that Windows allows probably just makes things more difficult. > For instance=2C going back to my comment about the need to make a source > level change here anyway=2C if we don't do checking in dlopen()=2C such a > change could be avoided. I'm thinking of a case where foo.so is the Linux > name and the makefile is altered (instead) to generate foo.so.dll for > Cygwin. OK=2C I expect this isn't going to be the average case by any > stretch of the imagination but it still seems like it's a nice "feature" = that > someone might want to leverage. The only advantage I can see to leaving > the current checks in place is to be more dogged in our attempts to be > POSIX compliant. I don't object to POSIX but in this case=2C I'm wonderin= g > if it really doesn't have any merit. > But this does not seem to be about POSIX compliance=2C insted it seems (to = me) to be about non-POSIX non-compliance=2C for which we have no requirement. ...Karl =20 _________________________________________________________________ Bing brings you maps=2C menus=2C and reviews organized in one place. http://www.bing.com/search?q=3Drestaurants&form=3DMFESRP&publ=3DWLHMTAG&cre= a=3DTEXT_MFESRP_Local_MapsMenu_Resturants_1x1= -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple