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Date: Fri, 13 Jan 2006 07:54:12 -0700
From: Eric Blake <ebb9 AT byu DOT net>
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Subject: Re: Define _POSIX_SOURCE in cygwin's features.h?
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According to Christopher Faylor on 1/12/2006 12:24 PM:
> This particular application was ircd.  It was testing _POSIX_SOURCE (and
> a few other defines) to determine whether it should use setsid or a
> two-argument version of setpgrp, e.g.:
> 
> #ifdef _POSIX_SOURCE
>     setsid ();
> #else
>     setpgr(..., ...);
> #endif

That is a bug in ircd.  It is ircd's responsibility to define
_POSIX_SOURCE itself if it wants strict POSIX compliance.  In other words,
if ircd wants to guarantee that it will compile on all POSIX-compliant
systems, it should have defined _POSIX_SOURCE and then it could blindly
use setsid() without any further heartburn.  But it is possible to be
portable to more systems than just those that are POSIX-compliant, so the
better approach for ircd would have been to do an autoconf test for the
existance of setsid, whether or not _POSIX_SOURCE was defined, and not a
test for the existance of _POSIX_SOURCE.

- --
Life is short - so eat dessert first!

Eric Blake             ebb9 AT byu DOT net
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