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Date:	Mon, 15 Feb 2021 10:14:19 +0100
To:	Patrick Chkoreff <pc AT fexl DOT com>
Subject:	Re: setrlimit always fails
Message-ID:	<20210215091419.GJ4251@calimero.vinschen.de>
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From:	Corinna Vinschen via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	cygwin AT cygwin DOT com
Cc:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>, cygwin AT cygwin DOT com
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On Feb 12 10:11, Patrick Chkoreff wrote:
> Ken Brown via Cygwin wrote on 2/11/21 9:06 PM:
> 
> > Cygwin's setrlimit only supports a few resources, as you can see in the
> > source:
> > 
> > https://cygwin.com/git/?p=newlib-cygwin.git;a=blob;f=winsup/cygwin/resource.cc;h=97777e9d223466b7635b990d6c9e0bfb9e2e9a46;hb=HEAD#l201
> [...]
> I will say that my first attempt at compiling the Linux code under
> Cygwin went very well.  The only compiler error was in some code that
> calls strptime.  To fix that, I had to use some macros in a sequence
> like this:
> 
> #ifdef __CYGWIN__
> /* Ensure that strptime is accessible. */
> #define _XOPEN_SOURCE
> #endif
> 
> #include <stdint.h>
> ...
> #ifndef __CYGWIN__
> /* Ensure that strptime is accessible. */
> #define __USE_XOPEN
> #endif
> 
> #include <time.h>
> 
> 
> That seems to be the simplest I can make that.

That looks wrong.  The __USE_<standard> flags are internal flags from
GLibc and not supposed to be used by application code.  Check the Linux
man page for strptime, the usage of _XOPEN_SOURCE or another flag
including _XOPEN_SOURCE (e. g. _GNU_SOURCE) is required.  So this:

  #define _XOPEN_SOURCE
  #include <time.h>

should be sufficient.


Corinna
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