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Date: Thu, 29 Nov 2018 11:27:55 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: _GNU_SOURCE doesn't enable cuserid() declaration
Message-ID: <20181129102755.GA30649@calimero.vinschen.de>
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References: <20181129022242 DOT 3llewsc7gottm6yv AT mars DOT tony DOT develop-help DOT com>
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On Nov 29 13:22, Tony Cook wrote:
> Linux stdio.h exposes the declaration of cuserid() both with standard
> version macros and with _GNU_SOURCE:
>=20
> tony AT mars:~/play$ cat testcuserid.c
> #define _GNU_SOURCE
> #include <stdio.h>
>=20
> int main() {
>   puts(cuserid(NULL));
>   return 0;
> }
> tony AT mars:~/play$ gcc -otestcuserid -Werror=3Dall testcuserid.c
> tony AT mars:~/play$ ./testcuserid
> tony
> tony AT mars:~/play$ uname -a
> Linux mars 4.9.0-8-amd64 #1 SMP Debian 4.9.110-3+deb9u4 (2018-08-21) x86_=
64 GNU/Linux
>=20
> while on Cygwin _GNU_SOURCE doesn't expose cuserid():

Thanks, I pushed a patch.

https://sourceware.org/git/?p=3Dnewlib-cygwin.git;a=3Dcommitdiff;h=3D09870c=
6e958c

Of course, that doesn't make cuserid more portable.  The rule given in
the Linux man page still applies:  "Do not use cuserid()."


Corinna

--=20
Corinna Vinschen
Cygwin Maintainer

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