From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham
	autolearn_force=no version=3.4.4
X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 103376,cceb19dbd864b8da
X-Google-Attributes: gid103376,public
X-Google-ArrivalTime: 2001-07-01 12:52:37 PST
Path: 
 archiver1.google.com!newsfeed.google.com!newsfeed.stanford.edu!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!newsfeed.icl.net!newsfeed00.sul.t-online.de!t-online.de!news-lei1.dfn.de!news-nue1.dfn.de!news-han1.dfn.de!news.fh-hannover.de!news.cid.net!news.enyo.de!news1.enyo.de!not-for-mail
From: Florian Weimer <fw@deneb.enyo.de>
Newsgroups: comp.lang.ada
Subject: Re: Unix-daemons in Ada
Date: 01 Jul 2001 21:51:39 +0200
Organization: Enyo's not your organization
Message-ID: <878zi8whpw.fsf@deneb.enyo.de>
References: <87sngg3jp8.fsf@520075220525-0001.dialin.t-online.de>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Xref: archiver1.google.com comp.lang.ada:9301
Date: 2001-07-01T21:51:39+02:00
List-Id: <comp.lang.ada>

Stefan Nobis <stefan@snobis.de> writes:

> I'm learning Ada and i tried to write a simple Unix daemon in Ada (a very
> simple web server). I want the main process, which is attached to a tty, to
> exit, something like
> 
> if (fork()) exit 0;
> else do_real_work();
> 
> in C.

Usually, you can't call fork() from Ada and do complicated things in
the child process (besides an execve()).  This has to do with the fact
that most fork() implementations don't duplicate the whole process
(only the current thread of execution), and that the runtime might
have stored PIDs which become outdated after this operation.

So it's best to detach *before* the Ada runtime is initialized.  How
you can achieve this depends on your Ada implementation.