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Subject: Re: issetugid - not declared when _XOPEN_SOURCE is also defined
To: cygwin AT cygwin DOT com
References: <d61199c7-85d2-039d-58cb-29fb8d6ff369 AT gmail DOT com>
From: cyg Simple <cygsimple AT gmail DOT com>
Message-ID: <9bb90c12-b50b-faf9-b309-f916dd84bebe@gmail.com>
Date: Wed, 9 Nov 2016 14:41:04 -0500
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On 11/9/2016 1:13 PM, cyg Simple wrote:
> The following program demonstrates the issue.  Should issetugid be
> declared with this scenario?
> 
> /*****************************************************/
> #define _XOPEN_SOURCE 1  /* Causes declare warning */
> #define __BSD_VISIBLE 1
> #include <unistd.h>
> 
> int main(int argc, char ** argv) {
> 	int result;
> 	result = issetugid();
> }
> /****************************************************/
> 

Because when _XOPEN_SOURCE is 1 _DEFAULT_SOURCE doesn't get set which
then #undef __BSD_VISIBLE and and sets it to 0.  See
/usr/include/sys/features.h.

If I #define _DEFAULT_SOURCE 1 before the #include then the above code
works.  However, should it?

-- 
cyg Simple

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