From owner-freebsd-questions@FreeBSD.ORG Wed Apr 5 13:56:12 2006 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 6D00916A400 for ; Wed, 5 Apr 2006 13:56:12 +0000 (UTC) (envelope-from herriojr@gmail.com) Received: from nproxy.gmail.com (nproxy.gmail.com [64.233.182.186]) by mx1.FreeBSD.org (Postfix) with ESMTP id B3C9543D67 for ; Wed, 5 Apr 2006 13:56:02 +0000 (GMT) (envelope-from herriojr@gmail.com) Received: by nproxy.gmail.com with SMTP id m18so147416nfc for ; Wed, 05 Apr 2006 06:56:01 -0700 (PDT) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=oOShC99lOTRVswQFJYcap9bQGGI+8WjmIf5aNMRi3ZOgLrYgS7GO2p2DaDOSA4Pe0WYNxJ+daxiwZ3mwDqifGSB4BgRzzwkgtdvZOnSsCRv44Gm2xWfsF6YJ+et8BSoWxqOHMX5wdV3xGxZ/chcpYXs8lH1pjdhjDLWlErIEylQ= Received: by 10.49.49.8 with SMTP id b8mr1066879nfk; Tue, 04 Apr 2006 18:33:04 -0700 (PDT) Received: by 10.49.29.3 with HTTP; Tue, 4 Apr 2006 18:33:04 -0700 (PDT) Message-ID: <6a56d69c0604041833y1f12fd43uc916f852128baeb5@mail.gmail.com> Date: Tue, 4 Apr 2006 21:33:04 -0400 From: "Jonathan Herriott" To: "usleepless@gmail.com" In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline References: <6a56d69c0604031439o7c2eed8an5710dad733a0e97@mail.gmail.com> <20060403174519.4d478a95.wmoran@collaborativefusion.com> <20060403220419.GA5042@epia2.farid-hajji.net> <6a56d69c0604041402i456d33cfm2c6f571e5c558e@mail.gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: C Program to execute programs in same console X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 05 Apr 2006 13:56:12 -0000 usleep, What I am trying to do is execute the command in the calling shell.=20 So, if I were to execute my program, which changes the directory, it would do the following: > pwd /usr/home/username/ > ./myprog .. > pwd /usr/home/ That's basically what I'm looking for. Being able to modify the calling shell with a program. Thanks, Jon On 4/4/06, usleepless@gmail.com wrote: > Jon, > > i believe you are mixing up some concepts. > > 1. if i read your title "C Program to execute programs in same > console". i think this is easy, just use system("ls *.txt") and you > are done. i believe you can choose wat to do with the output, i am not > sure. > > 2. but you come up with the cd-command, which you want to change the > context of your parent shell. changing the home-dir of the current > process ( your program ) can be done with chdir. altering the context > of your parent-shell-process can not be done, except for setting > environment variables ( through the proper C calls ) > > but if you are running your program, your "shell" (interpreter) is > temporarily not there: your program is running the show. every > system,execvp or whatever call will give you a child-process with a > new shell, not the parent-shell-process. i believe you may set > environment variables in your parent shell with the appropiate library > calls, but not through a system/execvp call. > > so, maybe you should define what you really want to achieve. for > example, qdvd-author runs alls kinds of external programs to generate > thumbnails and slideshows for example. > > anybody please correct me if i am wrong. > > regards, > > usleep > > > On 4/4/06, Jonathan Herriott wrote: > > Thanks for the suggestion. I haven't tried it yet, but I'll post if I > > get it working. > > > > Thanks, > > Jon > > > > On 4/3/06, cpghost wrote: > > > On Mon, Apr 03, 2006 at 05:45:19PM -0400, Bill Moran wrote: > > > > On Mon, 3 Apr 2006 21:39:11 +0000 > > > > "Jonathan Herriott" wrote: > > > > > So, my question is how can I get it to execute a cd in the curren= t > > > > > shell using c code. You don't have to give me the code, just giv= e me > > > > > a term to search for or a function to look up. I'm sure someone = knows > > > > > how to do it here! > > > > > > > > Unless I'm misunderstanding your question, "man 2 chdir" should hel= p > > out. > > > > > > Hmmm... chdir(2) would not change the parent process' (the shell's > > > process) current working directory, only the current working director= y > > > of the process running the C program. > > > > > > Perhaps connecting to the shell via a pty, and then sending it a 'cd' > > > command could work? Of look at how expect(1) (/usr/ports/lang/expect) > > > implements this kind of stuff... > > > > > > Regards, > > > -cpghost. > > > > > > -- > > > Cordula's Web. http://www.cordula.ws/ > > > > > _______________________________________________ > > freebsd-questions@freebsd.org mailing list > > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd= .org" > > >