Very Computer

by **Eric Phillip** » Wed, 01 Jul 1998 04:00:00

Hello. I need some help with something. I would like to run the WHOIS
program in the background, and get the output from that program. How
would I go about doing this in C?

--
Eric Phillips

by **Eric Phillip** » Wed, 01 Jul 1998 04:00:00

That is the part that I need the help with. Getting the stdout. How do I
get that? or how would I go about writing it to the file?

> >Hello. I need some help with something. I would like to run the WHOIS
> >program in the background, and get the output from that program. How
> >would I go about doing this in C?

> I'm not that expert on this, but I would guess that one could
> use the C system function to execute the Unix whois command in the
> background writing its output to a file and then moving the file
> upon completion. What the file contained would be indicative of
> success or failure, and it's existance would indicate completion.

> No doubt someone else will shread this approach, and give you a good
> answer. :-)

> Chuck Demas
> Needham, Mass.

> --
> Eat Healthy | _ _ | Nothing would be done at all,

> Die Anyway | v | That no one could find fault with it.

--
Eric Phillips

by **Charles Dem** » Thu, 02 Jul 1998 04:00:00

Quote:>Hello. I need some help with something. I would like to run the WHOIS
>program in the background, and get the output from that program. How
>would I go about doing this in C?

I'm not that expert on this, but I would guess that one could
use the C system function to execute the Unix whois command in the
background writing its output to a file and then moving the file
upon completion. What the file contained would be indicative of
success or failure, and it's existance would indicate completion.

No doubt someone else will shread this approach, and give you a good
answer. :-)

Chuck Demas
Needham, Mass.

--
Eat Healthy | _ _ | Nothing would be done at all,

Die Anyway | v | That no one could find fault with it.

by **Barry Margoli** » Thu, 02 Jul 1998 04:00:00

Quote:>Hello. I need some help with something. I would like to run the WHOIS
>program in the background, and get the output from that program. How
>would I go about doing this in C?

Use the popen(3) function.

--

GTE Internetworking, Powered by BBN, Cambridge, MA
*** DON'T SEND TECHNICAL QUESTIONS DIRECTLY TO ME, post them to newsgroups.

by **Johan Hellstro** » Thu, 02 Jul 1998 04:00:00

> >Hello. I need some help with something. I would like to run the WHOIS
> >program in the background, and get the output from that program. How
> >would I go about doing this in C?

> Use the popen(3) function.

... or the underlying pipe(), close()-dup() or dup2().

/JAH

by **mattr..** » Thu, 02 Jul 1998 04:00:00

On Tue, 30 Jun 1998 17:54:17 +0000, Eric Phillips

>Hello. I need some help with something. I would like to run the WHOIS
>program in the background, and get the output from that program. How
>would I go about doing this in C?

>--
>Eric Phillips

You should be able to use popen() to open a pipe connection to the
command you want to run. It returns a FILE *, so you treat it just
like an fopen().

example:

FILE *whoiscmd = popen( "whois", "r" );
------
Matt

------
- These views are my own, not necessarily those of my company.

by **Mark Brow** » Thu, 02 Jul 1998 04:00:00

> That is the part that I need the help with. Getting the stdout. How do I
> get that? or how would I go about writing it to the file?

Since the string passed to system() is interpreted by a shell, you can
probably say

system("command > file");

for appropriate command and file and read the file. That said, it is
probably simpler and safer to use the Unix-specific popen(). There
are some examples of the use of popen() in the comp.unix.programmer
FAQ, which is avalible from
http://www.erlenstar.demon.co.uk/unix/faq_toc.html or via FTP from
rtfm.mit.edu.

--

http://www.tardis.ed.ac.uk/~broonie/
EUFS http://www.eusa.ed.ac.uk/societies/filmsoc/

by **Roger Boo** » Fri, 03 Jul 1998 04:00:00

: That is the part that I need the help with. Getting the stdout. How do I
: get that? or how would I go about writing it to the file?

I hate to just recommend a book, however, check out _Advanced Programming
in the UNIX Environment_ by Stevens, assuming you are doing this on
Unix. Basicly it comes down to using fork() and dup(). If you need it
I have some code to do this (in C) but it is a bit much to post.

Roger
---------------------------------------------------------------------------
"Cryptography is like literacy in the Dark Ages. Infinitely potent, for
good and ill... yet basically an intellectual construct, an idea, which by
its nature will resist efforts to restrict it to bureaucrats and others who
deem only themselves worthy of such Privilege."
_ A thinking man's Creed for Crypto/ vbm.
---------------------------------------------------------------------------

Very Computer

Reading Output from another program

Reading Output from another program

Reading Output from another program

Reading Output from another program

Reading Output from another program

Reading Output from another program

Reading Output from another program

Reading Output from another program

Reading Output from another program