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Message-ID: | <46C6FEDC.5020709@x-ray.at> |
Date: | Sat, 18 Aug 2007 16:14:52 +0200 |
From: | Reini Urban <rurban AT x-ray DOT at> |
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To: | cygwin AT cygwin DOT com |
Subject: | Re: empty PATH, LD_LOAD_PATH default |
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Reini Urban schrieb: Oops! s/LD_LOAD_PATH/LD_LIBRARY_PATH/g of course. > Reini Urban schrieb: >> I have a minor compatibility problem. >> >> In Linux and other unices it is valid to start a process with an empty >> path because the LD_LOAD_PATH is correctly set to resolve the path for >> dynamic libraries. >> I have this situation in perl TAINT-checked environments. >> Our dll loader cannot handle LD_LOAD_PATH because in the case of >> linked shared libs we don't have our own loader, besides doing the >> dynamic dlopen. >> >> So in linux et al. it is valid to do: >> $ PATH= ./someprog-with-dependent-so >> because linux has LD_LOAD_PATH and paths from /etc/ld.so.conf >> while under cygwin it will fail. >> >> Is there some fast way in the environment handling of the startup from >> cygwin processes before CreateProcess with a cygwin binary to detect >> an empty PATH, to mimic the behaviour of >> LD_LOAD_PATH=/usr/bin:$SYSTEMROOT/System32 >> Setting PATH to "/usr/bin/:$SYSTEMROOT:$SYSTEMROOT/System32" >> to resolve the dll's to please the kernel loader. > > $SYSTEMROOT:$SYSTEMROOT/System32 is not needed, since native windows > loads an exe with dll dependencies in $SYSTEMROOT/System32 and empty > PATH correctly. Some CreateProcess magic. > So only some similar /usr/bin magic is required. > >> Or is this a stupid idea? It would make process slower I assume if we >> want to detect the dependency of shared libs in processes to be created. >> >> I do not know how the situation of an empty PATH in cygwin >> should be handled. >> cygcheck does write "WARNING: PATH is not set at all!" >> Currently the process fails to start, which seems logic, but is a bit >> incompatible. -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
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