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Subject: Re: TMP/TEMP environment variable and /tmp
Date: Thu, 17 Sep 2020 23:07:18 +0200
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From: Kristian Ivarsson via Cygwin <cygwin AT cygwin DOT com>
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>>>>>> Does anyone know the rational with this behaviour and what can be
>>>>>> done to get hold of the (real) Windows TMP/TEMP
>>>>>> environment-variable-values (in a
>>>>>> (hopefully) platform independent way) ?
>>>>> so if you are making your custom tree, try to stick on that
>>>>> expectation and have both directories.
>>>> In general, you are free to set TMP to a directory of your choice,
>>>> that's the purpose of that variable, no need to sync it with some root.
>>>> There is a comment in /etc/profile:
>>>>    # TMP and TEMP as defined in the Windows environment
>>>>    # can have unexpected consequences for cygwin apps, but it does not
>>>> explain what consequences that might be; probably some trouble with
>>>> ACL/access permissions for temporary files.
>>> Nowadays that would be $LOCALAPPDATA/Temp, or if you really insist, the
>>> content of /proc/registry/HKEY_CURRENT_USER/Environment/TMP (or TEMP),
>>> after similarly expanding environment variable references found in that.
>>> 
>>> The fact that getting Windows' idea of the user's TEMP directory is not
>>> immediately platform independent may well have been part of the rationale
>>> for not even trying that.
>> 
>> Well, at least it's up to the user
>> 
>> If the user sets its TMP-variable to "C:\Jabba Dabba Dooo" or "/jabba dabba doo", I expect the value of getenv("TMP") should be just that and regardless of OS the value returned is whatever the variable is set to and not magically changed to "/tmp"
> Of course and that's not happening, no worries. The issue was that TMP is set in /etc/profile and not inherited from the Windows environment.

Well, where my Cygwin-compiled-application is running, there’s no Cygwin-installation and thus no /etc/profile so it cannot be set there (if /etc/profile is not a built in resource in every executable), so there must be some text-value inside the compiled executables used in some manner somehow

Best regards,
Kristian

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