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To:	"gs-cygwin DOT com AT gluelogic DOT com" <gs-cygwin DOT com AT gluelogic DOT com>,
	Roland Mainz
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CC:	"cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject:	RE: [EXTERNAL] Re: Will all SIDs fit into |SECURITY_MAX_SID_SIZE|
	bytes ? / was: Re: Switching groups with newgrp - how to get the new group
	with |GetTokenInformation()| ?
Thread-Topic:	[EXTERNAL] Re: Will all SIDs fit into |SECURITY_MAX_SID_SIZE|
	bytes ? / was: Re: Switching groups with newgrp - how to get the new group
	with |GetTokenInformation()| ?
Thread-Index:	AQHaZ1NggkN+p9YFxEeTd4L0uiSEPbEbjcqAgAAYjgCAASdCMA==
Date:	Mon, 26 Feb 2024 16:12:00 +0000
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From:	"Lavrentiev, Anton \(NIH/NLM/NCBI\) \[C\] via Cygwin" <cygwin AT cygwin DOT com>
Reply-To:	"Lavrentiev, Anton \(NIH/NLM/NCBI\) \[C\]" <lavr AT ncbi DOT nlm DOT nih DOT gov>
Sender:	"Cygwin" <cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com>

> A robust solution which also reduces syscalls does not necessarily
> require a precise answer here.
> 
> I suggest writing a wrapper function which has on the stack
>   CSTR sidbuf[SECURITY_MAX_SID_SIZE];
> and calls LookupAccountNameA() passing sidbuf as Sid.
> If it succeeds, then malloc() returned cbSid value and copy sidbuf[].
> If it fails because the buffer is too small, then malloc() the returned
> cbSid value and call LookupAccountNameA() again.
> 
> Doing the above will keep memory use to a minimum, and will generally
> call LookupAccountNameA() once per wrapper func invocation rather than
> twice.

+1 !

Anton Lavrentiev
Contractor NIH/NLM/NCBI


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