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Message-ID: <54415863.20702@t-online.de>
Date: Fri, 17 Oct 2014 19:56:51 +0200
From: Christian Franke <Christian.Franke@t-online.de>
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To: cygwin@cygwin.com
Subject: Re: Cannot exec() program outside of /bin if PATH is unset
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> <20141017145119.GT2681@calimero.vinschen.de>
In-Reply-To: <20141017145119.GT2681@calimero.vinschen.de>
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Corinna Vinschen wrote:
> 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.
>>> For some reason, the SetDllDirectory() call has no effect for exec():
>>>
>>> Testcase:
>>>
>>> $ unset PATH
>>>
>>> $ uname -srvm
>>> -bash: uname: No such file or directory
>>>
>>> $ /bin/uname -srvm
>>> CYGWIN_NT-6.1-WOW64 1.7.33s(0.277/5/3) 20141014 19:44:03 i686
>>>
>>> $ /usr/sbin/alternatives
>>> /usr/sbin/alternatives: error while loading shared libraries: ?: cannot open
>>> shared object file: No such file or directory
>> 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.
>>
>> [...]
>>
>> but it doesn't on Vista and W7, wow.
>>
>> 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.
>>
>> 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.

Now works.

cygwin_patches_for_postfix_count++; postfix_patches_for_cygwin_count--; :-)

Thanks,
Christian


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