Date: Wed, 5 Apr 2006 08:29:45 +0200 From: usleepless@gmail.com To: "Jonathan Herriott" <herriojr@gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: C Program to execute programs in same console Message-ID: <c39ec84c0604042329w728bd4a4wc249c6dc2c89cb12@mail.gmail.com> In-Reply-To: <6a56d69c0604041833y1f12fd43uc916f852128baeb5@mail.gmail.com> References: <6a56d69c0604031439o7c2eed8an5710dad733a0e97@mail.gmail.com> <20060403174519.4d478a95.wmoran@collaborativefusion.com> <20060403220419.GA5042@epia2.farid-hajji.net> <6a56d69c0604041402i456d33cfm2c6f571e5c558e@mail.gmail.com> <c39ec84c0604041430m75e7f510h49f9cbecca89a35b@mail.gmail.com> <6a56d69c0604041833y1f12fd43uc916f852128baeb5@mail.gmail.com>
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Hi Jon,
could you give another example ( not cd ) of a command which you would
like to execute in the calling shell?
regards,
usleep
On 4/5/06, Jonathan Herriott <herriojr@gmail.com> wrote:
> usleep,
>
> What I am trying to do is execute the command in the calling shell.
> 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 <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 <herriojr@gmail.com> 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 <cpghost@cordula.ws> 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" <herriojr@gmail.com> wrote:
> > > > > > So, my question is how can I get it to execute a cd in the
> current
> > > > > > shell using c code. You don't have to give me the code, just g=
ive
> me
> > > > > > a term to search for or a function to look up. I'm sure someon=
e
> knows
> > > > > > how to do it here!
> > > > >
> > > > > Unless I'm misunderstanding your question, "man 2 chdir" should
> help
> > > out.
> > > >
> > > > Hmmm... chdir(2) would not change the parent process' (the shell's
> > > > process) current working directory, only the current working
> directory
> > > > of the process running the C program.
> > > >
> > > > Perhaps connecting to the shell via a pty, and then sending it a 'c=
d'
> > > > command could work? Of look at how expect(1) (/usr/ports/lang/expec=
t)
> > > > 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"
> > >
> >
>
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