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Subject:	Re: Help with C clearenv and setenv
To:	cygwin AT cygwin DOT com
References:	<CABHT962nB5jK2sNP9jGaVEbWGrvD72hBVN_q6xX9TKuq3yQ0Gg AT mail DOT gmail DOT com>
From:	Marco Atzeri <marco DOT atzeri AT gmail DOT com>
Message-ID:	<5f1c24df-3312-4497-9b39-7b96a85de982@gmail.com>
Date:	Thu, 31 May 2018 05:56:07 +0200
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On 5/30/2018 4:48 PM, Sam Habiel wrote:
> I have code for a database I am porting to Cygwin.
> 
> Part of that code is a clearenv() then a couple of setenvs. There is
> an ifdef for Cygwin, as it doesn't implement clearenv. It just sets
> environ = NULL. Well--that really breaks setenv! It returns a "Bad
> Poniter" error (-1).
> 
> What is the correct way to clear environment variables in Cygwin?
> 
> --Sam


not tested but it seems Cygwin is not the only platform
with problem on environ = NULL

environ = calloc(1, sizeof(*environ))

see
https://github.com/samba-team/samba/blob/master/source3/client/smbspool_krb5_wrapper.c

https://github.com/dovecot/core/blob/master/src/lib/env-util.c


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