From owner-freebsd-hackers@FreeBSD.ORG  Thu Mar 31 07:37:23 2005
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 8669516A4CE
	for <freebsd-hackers@freebsd.org>;
	Thu, 31 Mar 2005 07:37:23 +0000 (GMT)
Received: from mail17.syd.optusnet.com.au (mail17.syd.optusnet.com.au
	[211.29.132.198])
	by mx1.FreeBSD.org (Postfix) with ESMTP id D0A6B43D49
	for <freebsd-hackers@freebsd.org>;
	Thu, 31 Mar 2005 07:37:22 +0000 (GMT)
	(envelope-from PeterJeremy@optushome.com.au)
Received: from cirb503493.alcatel.com.au
	(c211-30-75-229.belrs2.nsw.optusnet.com.au [211.30.75.229])
	j2V7bLYk030667
	(version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=NO);
	Thu, 31 Mar 2005 17:37:21 +1000
Received: from cirb503493.alcatel.com.au (localhost.alcatel.com.au
	[127.0.0.1])j2V7bK7l075665;	Thu, 31 Mar 2005 17:37:20 +1000 (EST)
	(envelope-from pjeremy@cirb503493.alcatel.com.au)
Received: (from pjeremy@localhost)j2V7bKjt075664;
	Thu, 31 Mar 2005 17:37:20 +1000 (EST)	(envelope-from pjeremy)
Date: Thu, 31 Mar 2005 17:37:20 +1000
From: Peter Jeremy <PeterJeremy@optushome.com.au>
To: zean zean <fbsd.hackers@gmail.com>
Message-ID: <20050331073720.GE71384@cirb503493.alcatel.com.au>
References: <a9e342b5050330101771e53d6f@mail.gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <a9e342b5050330101771e53d6f@mail.gmail.com>
User-Agent: Mutt/1.4.2i
cc: freebsd-hackers@freebsd.org
Subject: Re: the best form to wait the finish of execution of a child...
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 31 Mar 2005 07:37:23 -0000

On Wed, 2005-Mar-30 14:17:43 -0400, zean zean wrote:
>Excuse for my badly English.  which is the best form to wait  the
>finish of execution of a child.

That's virtually impossible to answer as a general case.  The best
form depends on exactly what you want to do.

>My idea is:
>
>pid_t chilpid;
>
>while(childpid != wait(&status))
>;


If you want to wait for a specific pid, look at waitpid() or wait4():
	if (waitpid(childpid, &status, 0) == -1) {
		handle error
	}

-- 
Peter Jeremy