Return to BSD News archive
Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!munnari.OZ.AU!spool.mu.edu!newspump.sol.net!www.nntp.primenet.com!nntp.primenet.com!arclight.uoregon.edu!news.uoregon.edu!news.rediris.es!acebo.sdi.uam.es!newsmasters
From: txomsy@bossa-nova.cnb.uam.es (Jose R. Valverde)
Newsgroups: comp.unix.bsd.misc
Subject: Re: Programming Ques. - Fork and Wait
Date: 8 Oct 1996 16:59:01 GMT
Organization: EMBnet/CNB
Lines: 30
Message-ID: <53e18l$m2s@acebo.sdi.uam.es>
References: <532p4u$al0@cssun.cs.usm.my> <5357bg$lff@cssun.cs.usm.my>
<53aijp$3ko@innocence.interface-business.de>
NNTP-Posting-Host: bossa-nova.cnb.uam.es
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
X-Newsreader: knews 0.9.8
In article <53aijp$3ko@innocence.interface-business.de>,
j@ida.interface-business.de (J Wunsch) writes:
> cyfok@network4.cs.usm.my (Chee-Youn Fok) wrote:
>
>> Sorry for my previous posting which didn't come with the question.
>> ACtually I would like to ask whether is it possible to implement the
>> algorithm ? Since what I heard is that we can't pass value to the child
>> process which is created by the parent process.
>
> Of course, you can pass a value down to the child. If you've got the
> value ready before fork()ing, the child will (of course) inherit it.
> Otherwise, you gotta use one of the various IPC methods. For BSD-like
.....
>
> Passing up a value from the child to its parent, however, always
> requires IPC.
>
Pardon?
For the kind of problem proposed there may be other possibilities.
If you know the value, you can pass it as an argument to a child process
called with exec after the fork().
You can get an integer result from a child just looking at its
status code.
In this case this might do the trick without IPC.
jr