X-Recipient: archive-cygwin AT delorie DOT com DomainKey-Signature: a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id :list-unsubscribe:list-subscribe:list-archive:list-post :list-help:sender:date:from:to:subject:message-id:reply-to :references:mime-version:content-type:in-reply-to; q=dns; s= default; b=RjDHhLF06hDbyA/qS++bPYFZAfg+oB0YabJD/J1q+sXR9Ad6dcHOo iUbpy4rl4+jQzkrbZHc5L02AZXaoStuV/3H/0qky1u21znri1o+R/FHj1FtfAm/U rwzmAXDuXq3k+P7G+Ui+EZIXggSQH5wG/MDAAN+mAlprYNhACKdDDM= DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id :list-unsubscribe:list-subscribe:list-archive:list-post :list-help:sender:date:from:to:subject:message-id:reply-to :references:mime-version:content-type:in-reply-to; s=default; bh=Y2XDsmrCDwkux4mzhyeRqc3g2aA=; b=x/KIFAvieEHbPDTRD8NT3kltFC3m pIzVGHsdG3HH0in9/EagOysceEr5OZLrGTG7J8PEZVAUd1LA6kkisUenvMhtGXUM 9PkVcQa1JHo8aSaobUNebtwAs45OsJrgys2P8tqqwIYhB94dyLO/+VetWb3hQI9W /U+94NGpiw1ckBA= Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com Delivered-To: mailing list cygwin AT cygwin DOT com Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-5.9 required=5.0 tests=AWL,BAYES_00 autolearn=ham version=3.3.2 X-HELO: calimero.vinschen.de Date: Tue, 14 Oct 2014 21:30:45 +0200 From: Corinna Vinschen To: cygwin AT cygwin DOT com Subject: Re: Cannot exec() program outside of /bin if PATH is unset Message-ID: <20141014193045.GF2681@calimero.vinschen.de> Reply-To: cygwin AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com References: <20141009100317 DOT GI29235 AT calimero DOT vinschen DOT de> <54369ADE DOT 7060201 AT redhat DOT com> <20141009162906 DOT GA25389 AT calimero DOT vinschen DOT de> <571726 DOT 85545 DOT bm AT smtp112 DOT sbc DOT mail DOT ne1 DOT yahoo DOT com> <20141010103446 DOT GJ2681 AT calimero DOT vinschen DOT de>

<816144 DOT 8551 DOT bm AT smtp119 DOT sbc DOT mail DOT ne1 DOT yahoo DOT com> <20141010153925 DOT GL2681 AT calimero DOT vinschen DOT de> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="q56cwELb5ReCVVQh" Content-Disposition: inline In-Reply-To: <20141010153925.GL2681@calimero.vinschen.de> User-Agent: Mutt/1.5.23 (2014-03-12) --q56cwELb5ReCVVQh Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Oct 10 17:39, Corinna Vinschen wrote: > On Oct 10 14:13, Arjen Markus wrote: > > 2014-10-10 13:22 GMT+02:00 : > > >>2014-10-10 13:24 GMT+02:00 Jan Nijtmans <...>: > > >>> 2014-10-10 12:34 GMT+02:00 Corinna Vinschen <...>: > > >>>> On Oct 9 11:46, tednolan.net wrote: > > >>>>> I'm pretty sure I've got some programs loading Tcl extensions that > > >>>>> cd into the directory with the extension dlls, load the extension= and then > > >>>>> change back to where ever they were. > > >>>> > > >>>> Hmm. If so, it's quite a weird way to handle this, rather than > > >>>> loading the modules with full path. > > >>>> > > >>>> Is that a Tcl "feature", or is it how certain Tcl apps are impleme= nted? > > >>>> I can't really believe the former... > > >>> > > >>> This is certainly not a Tcl "feature"! The standard Tcl extension > > >>> mechanism always uses the full path simply because Tcl > > >>> cannot depend on platform-specific ways to search for > > >>> such libraries elsewhere. > > >>> > > >>> I'm willing to test this;I don't believe such a change > > >>> will break anything in my Tcl environment. > > >>> > > >>> Regards, > > >>> Jan Nijtmans > > > > > > Hmm, > > > > > > It's been a while, but I think it is something like the extension is > > > a DLL, but it depends on another DLL. Consider for instance, mysqltc= l. > > > If you want to deploy that, you need the mysqltcl.dll and the mysql d= ll, > > > so you either have to be in the same dir when you load the extension, > > > or put that dir in PATH. > > > > > > Unfortunately, I can't run a test release on my work machine, or take > > > my work progs home. > >=20 > > Right, that makes sense. There is indeed no way for the package > > manager to handle that scenario without external help, such as a PATH > > variable that includes the various directories these extra DLLs reside > > in. >=20 > There might be a potential workaround. Given that Cygwin Tcl calls > dlopen to load DLLs, we have this somewhat under control. >=20 > The default DLL search algorithm searches the application dir for > dependent DLLs. But there's a LoadLibraryEx flag called > LOAD_WITH_ALTERED_SEARCH_PATH. When using this flag, and the DLL is > given with full path, the application dir in the DLL search path is > replaced by the directory of the DLL. Thus, dependent DLLs will be > searched in the same dir the original DLL has been loaded from. >=20 > This could be utilized in dlopen. If the DLL is given with no path, and > if LoadLibrary failes, create the full path to the DLL and call > LoadLibraryEx (full_path, LOAD_WITH_ALTERED_SEARCH_PATH). DLLs in /bin > are taken care of by the SetDllDirectory call we're talking about here. I implemented this in the latest snapshot. It calls SetDllDirectory on Cygwin's /bin, and dlopen addiotnally tries to load the DLL with LoadLibraryEx(LOAD_WITH_ALTERED_SEARCH_PATH) if all else failed. Please give the latest snapshot from https://cygwin.com/snapshots/ a try. Thanks, Corinna --=20 Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Maintainer cygwin AT cygwin DOT com Red Hat --q56cwELb5ReCVVQh Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBAgAGBQJUPXnkAAoJEPU2Bp2uRE+gl/AP/j+P63MJrS9P/39Yi9sLVfIL ZdS1dooZhW4yXI4YUXWg3oy2rFXeOPw58QKVYg/DEIz1NY7lI8ObcGk3ea1PdNAW CtDCCkP4nlCRPdgrVSqMN4ggxGnMIuCOCb+C1AU+8MPrVMWfSqnLFnXG2R5CXpg1 0NR8dkJaIMjiQ+URI8AhGuWVzACa2sZpOe/2nh9Aw+RqdUNTUCSFqd857eTqw9d+ jdfpR2cFDx339XLBMJDdBYiYhF+Y01aTXmkiumZ+Sr7HXKDuovBl9QWMSAQqwGCb hR2zm//GwKmMEJmiCQEg1Zrut7jqVW/eWQDmBXdm5k1hkQnS+o/1suPaexmgbVC/ w5tw6jg2mamdmuBJ5DEy5zfbdjmcjCeydV17F3yJAPFxMmNpDxtoAlBUQk7VGlkJ 3cURFXSIhxAJJEPhSHqXlxvxM/kQyAHKYA1Ga2DJNS030WNd/R6P638Mg2u9tWvb T3v1EO1fDa+gsaDuxjklmQL0q2HECZumBGRjw31fTEYHeKSlKi25CCLO3eESJuDk A3ohnXFdq0yHjzG1bt2p5owYgFffK0M84+F+U/qpQfPkx+aFuEvMyOsfsedi7nNP TCIwNLVdPjHxvfR54CqOiq5Cy1rHZ3xF2WzlHqCR30ZqeVWtfKTx5otNDawFwKlb 44MSKzWHxxbTs4e9smh0 =6orh -----END PGP SIGNATURE----- --q56cwELb5ReCVVQh--