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Subject:	Re: Sv: TMP/TEMP environment variable and /tmp
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From:	Thomas Wolff <towo AT towo DOT net>
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Date:	Thu, 17 Sep 2020 17:23:31 +0200
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Am 17.09.2020 um 14:12 schrieb Kristian Ivarsson via Cygwin:
>>>>> 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.
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