From owner-freebsd-hackers@FreeBSD.ORG  Thu Sep  8 20:54:32 2005
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
X-Original-To: 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 1C6FD16A41F
	for <freebsd-hackers@freebsd.org>; Thu,  8 Sep 2005 20:54:32 +0000 (GMT)
	(envelope-from victor.cruceru@gmail.com)
Received: from wproxy.gmail.com (wproxy.gmail.com [64.233.184.205])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 9406943D49
	for <freebsd-hackers@freebsd.org>; Thu,  8 Sep 2005 20:54:31 +0000 (GMT)
	(envelope-from victor.cruceru@gmail.com)
Received: by wproxy.gmail.com with SMTP id 36so1679490wra
	for <freebsd-hackers@freebsd.org>; Thu, 08 Sep 2005 13:54:31 -0700 (PDT)
DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com;
	h=received:message-id:date:from:reply-to:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references;
	b=hHlm23dthZgYe6/+/ZCzrM1hDN79O/w8yNwbrEqjHeHENlH4oXS/Z1Bl6+XFVrhzBnwn3g0OrIGp3mLYnO7KHG6a99huHRQE4rAg/VWXikL5pHdy47JzvGXwGEstLLpHoZ2Or1FMuyB3rgsrwS+fmHWvYQTJWLkoN9EyswP/vCc=
Received: by 10.54.97.2 with SMTP id u2mr1073801wrb;
	Thu, 08 Sep 2005 13:54:30 -0700 (PDT)
Received: by 10.54.103.8 with HTTP; Thu, 8 Sep 2005 13:54:30 -0700 (PDT)
Message-ID: <494025505090813545451dae6@mail.gmail.com>
Date: Thu, 8 Sep 2005 23:54:30 +0300
From: victor cruceru <victor.cruceru@gmail.com>
To: erkan kolemen <erkankolemen@yahoo.com>
In-Reply-To: <20050908203521.84843.qmail@web33405.mail.mud.yahoo.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline
References: <494025505090813027dc0d6d3@mail.gmail.com>
	<20050908203521.84843.qmail@web33405.mail.mud.yahoo.com>
Cc: freebsd-hackers@freebsd.org
Subject: Re: fok() execve() -> No child processes
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
Reply-To: soc-victor@freebsd.org
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, 08 Sep 2005 20:54:32 -0000

Well, I suppose that execve is successful. if not you should call
_exit() instead of exit() in the child process (you should not return
from e_x_e_c if the exec fails)
Also your application should not  ignore SIGCHLD.
See man vfork and especially man wait.=20
victor cruceru

On 9/8/05, erkan kolemen <erkankolemen@yahoo.com> wrote:
> i tried and still same error.
>=20
> thanks.
>=20
> --- victor cruceru <victor.cruceru@gmail.com> wrote:
>=20
> > Try to replace vfrork with fork and check if you'll
> > get the same behavior.
> > victor cruceru
> >
> >
> > On 9/8/05, erkan kolemen <erkankolemen@yahoo.com>
> > wrote:
> > > Following code fails. I debugged it and saw that:
> > it
> > > produces "No child processes" error while wait().
> > >
> > > is it possible, parent still is not start to wait
> > but
> > > child finished. After that CPU schedules parents.
> > It
> > > try to start wait but child has finished.
> > >
> > > is it possible... What can i do for that?
> > >
> > > static int e_x_e_c(char *cmd[])
> > > {
> > >        pid_t pid;
> > >        int stat;
> > >
> > >        switch((pid =3D vfork())) {
> > >                case -1:
> > >                        syslog(LOG_ERR, "fork: %s",
> > > strerror(errno));
> > >                        return -16;
> > >                        break;
> > >                case 0:
> > >                        if(execve(cmd[0], cmd,
> > NULL)
> > > =3D=3D -1) {
> > >                                syslog(LOG_ERR,
> > > "execve: %s", strerror(errno));
> > >                                return -15;
> > >                        }
> > >                        break;
> > >                default:
> > >                        if (wait(&stat) =3D=3D -1) {
> > >                                slog(1, LOG_ERR);
> > >                                return -14;
> > >                        }
> > >
> > >                        if (WIFSIGNALED(stat)) {
> > >                                syslog(LOG_NOTICE,
> > "%s
> > > is signalled", cmdline[0]);
> > >                                return -13;
> > >                        }
> > >
> > >                        if (WIFSTOPPED(stat)) {
> > >                                syslog(LOG_NOTICE,
> > "%s
> > > is stopped", cmdline[0]);
> > >                                return -12;
> > >                        }
> > >
> > >                        if (WIFEXITED(stat))
> > >                                return
> > > WEXITSTATUS(stat);
> > >                        break;
> > >        }
> > >        return -11;
> > > }
> > >
> > >
> > >
> > >
> > >
> > >
> >
> ______________________________________________________
> > > Click here to donate to the Hurricane Katrina
> > relief effort.
> > > http://store.yahoo.com/redcross-donate3/
> > > _______________________________________________
> > > freebsd-hackers@freebsd.org mailing list
> > >
> >
> http://lists.freebsd.org/mailman/listinfo/freebsd-hackers
> > > To unsubscribe, send any mail to
> > "freebsd-hackers-unsubscribe@freebsd.org"
> > >
> >
>=20
>=20
>=20
>=20
>=20
> ______________________________________________________
> Click here to donate to the Hurricane Katrina relief effort.
> http://store.yahoo.com/redcross-donate3/
>