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Date: Fri, 17 Oct 2014 16:51:19 +0200
From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: Cannot exec() program outside of /bin if PATH is unset
Message-ID: <20141017145119.GT2681@calimero.vinschen.de>
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References: <571726.85545.bm@smtp112.sbc.mail.ne1.yahoo.com> <20141010103446.GJ2681@calimero.vinschen.de> <CAO1jNwt5UyB9CDKJdotXUND--mg1sY-5Fu+-ZHf2atM5_=HArA@mail.gmail.com> <CAMCbSMrar1Zu4p6gN=gc8-XqE-8RUTmP3er0ujeN--CHKzCNAQ@mail.gmail.com> <816144.8551.bm@smtp119.sbc.mail.ne1.yahoo.com> <CAMCbSMpWKbSVhVu85_02fN3sgWXiFBkUzjOOAJ6+Jxot8X6E=Q@mail.gmail.com> <20141010153925.GL2681@calimero.vinschen.de> <20141014193045.GF2681@calimero.vinschen.de> <54403DCD.7090107@t-online.de> <20141017091025.GA10087@calimero.vinschen.de>
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On Oct 17 11:10, Corinna Vinschen wrote:
> On Oct 16 23:51, Christian Franke wrote:
> > Corinna Vinschen wrote:
> > >...
> > >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.
> >=20
> > For some reason, the SetDllDirectory() call has no effect for exec():
> >=20
> > Testcase:
> >=20
> > $ unset PATH
> >=20
> > $ uname -srvm
> > -bash: uname: No such file or directory
> >=20
> > $ /bin/uname -srvm
> > CYGWIN_NT-6.1-WOW64 1.7.33s(0.277/5/3) 20141014 19:44:03 i686
> >=20
> > $ /usr/sbin/alternatives
> > /usr/sbin/alternatives: error while loading shared libraries: ?: cannot=
 open
> > shared object file: No such file or directory
>=20
> Weird.  The same sequence of commands works fine for me on W8,
> W8.1 and W10 64 bit, under i686 as well as x86_64 Cygwin.=20=20
>=20
> [...]
>=20
> but it doesn't on Vista and W7, wow.
>=20
> The question now is, is it because the path given to SetDllDirectory
> is not propagated to child processes on older systems, or is it
> because the directory is only used in calls to LoadLibrary{Ex} on
> older systems.
>=20
> Stay tuned, I have to investigate this.

Ok, so prior to W8, the SetDllDirectory path is not propagated to child
processes :-|

I created a patch and a new snapshot on https://cygwin.com/snapshots/
which calls SetDllDirectory during initialization of every process.
Please give it a try.


Thanks,
Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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