Date: Tue, 4 Apr 2006 21:33:04 -0400 From: "Jonathan Herriott" <herriojr@gmail.com> To: "usleepless@gmail.com" <usleepless@gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: C Program to execute programs in same console Message-ID: <6a56d69c0604041833y1f12fd43uc916f852128baeb5@mail.gmail.com> In-Reply-To: <c39ec84c0604041430m75e7f510h49f9cbecca89a35b@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>
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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 <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 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/
> > >
> > _______________________________________________
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> >
>
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