Very Computer

by **Nelson Miguel Viei** » Fri, 24 Feb 1995 07:29:33

I'm new to C and UNIX :) How would I call another program from
within a C program

Thanks

--

2nd Year CompSci Honours | WEB page:
University of Manitoba | ftp://ftp.cc.umanitoba.ca
Winnipeg, Manitoba, Canada | /pub/umvieir2/index.html

by **James Knowle** » Fri, 24 Feb 1995 22:21:32

Newsgroups: comp.unix.programmer
Date: 22 Feb 1995 22:29:33 GMT
Organization: The University of Manitoba

I'm new to C and UNIX :) How would I call another program from
within a C program

Thanks

--

2nd Year CompSci Honours | WEB page:
University of Manitoba | ftp://ftp.cc.umanitoba.ca
Winnipeg, Manitoba, Canada | /pub/umvieir2/index.html

--------------------
check out the execlxxx series (execl, with variety of endings),
or the system() call. read up on the specifics before trying.
--------------------
disclaimer:----these are only MY opinions, and, anyway,
they're only my OPINIONS...
----

by **Brian B. Rodenbo** » Sun, 26 Feb 1995 09:14:13

Quote:
> I'm new to C and UNIX :) How would I call another program from
>within a C program

>Thanks

If you are referring to calling another executable program, the usual ways
are to use the system call (simple) or one of the family of exec calls.
There are a number of these, you have to choose the one that fits best. An
exec replaces the calling program entirely, so it is usually used in
conjunction with a fork call, with the child process doing the actual
exec. For most applications, system works pretty well. Check the man pages
on the various calls.

Brian Rodenborn
McDonnell-Douglas Aerospace

by **Brian B. Rodenbo** » Wed, 08 Mar 1995 03:15:22

Quote:
> I'm new to C and UNIX :) How would I call another program from
>within a C program

Check out system and the exec family. These are the normal ways of running
another (executable) program from within a C program. If you use one of the
exec calls, it replaces the calling program, so it is usually used with an
fork to spawn off a child process to do the exec.

Brian Rodenborn
McDonnell-Douglas Aerospace

by **Ken Shephe** » Mon, 22 May 1995 04:00:00

: Newsgroups: comp.unix.programmer
: Date: 22 Feb 1995 22:29:33 GMT
: Organization: The University of Manitoba

: I'm new to C and UNIX :) How would I call another program from
: within a C program

You can use the system() function...

int rc;
rc = system("ls -laxpi");

Each command you can call can define its own set of return codes.
If calling another c language program, it will set its return
code via the exit() function.

--
-------------------------------------------------------------------------------
Ken Shepherd __ __ ____ ___ ___ ____

/ / \ / / / / /__ / \/ /___ /
-------------------------------------------------------------------------------

by **Jose Barr** » Tue, 23 May 1995 04:00:00

: : Newsgroups: comp.unix.programmer
: : Date: 22 Feb 1995 22:29:33 GMT
: : Organization: The University of Manitoba

: : I'm new to C and UNIX :) How would I call another program from
: : within a C program

: You can use the system() function...

: int rc;
: rc = system("ls -laxpi");

: Each command you can call can define its own set of return codes.
: If calling another c language program, it will set its return
: code via the exit() function.

: [.sig deleted]

I guess, in this day and age, most people would recommend 'popen' instead
of 'system' .... thus try 'man popen'

Cheers!

Jose

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