From:	Maxximo <mssmsoft AT my-dejanews DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: I have a question, and need some help...
Date:	Wed, 28 Apr 1999 07:54:01 GMT
Organization:	Deja News - The Leader in Internet Discussion
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References:	<7g54u0$r65 AT newsops DOT execpc DOT com>
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To:	djgpp AT delorie DOT com
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In article <7g54u0$r65 AT newsops DOT execpc DOT com>,
  "Joshua Tacey" <josht AT softhouse DOT com> wrote:
> Hi everyone, I am sorta new to C, I have read a few books, but none of them
> cover in any debth. Executing other programs and such. So i have this
> question.
>
> In an install routine of a game that I am working on,
>
> I need for the User to type in a path for the files to go into and then have
> that path be passed as an argument to the program that the install program
> must execute. I need for the Origional Program (The Install One) to keep on
> running after the program it exec's is complete.

Your problem have two solution.

In standard C, you must:
	-create a new process (son) with fork()
	-in the son code, call the exec..() function
	-in the parent code, call the wait() function

like this:

	pid_t pid;
	int status;


	pid = fork();
	if (pid == 0) {	/* son code */
		execl("/this/is/new/program.exe", "program.exe", "argument", 0);
		exit(1);	/* only if exec fails */
	}

	/* parent code */
	if (pid < 0) {
		perror("fork");
	}
	else {
		wait(&status);
		/* see wait() manual page to know more about status */
	}


Under Djgpp, I think that you must use spawn() with the flag P_WAIT to
execute a son process and wait for its end. See the spawn() manual page for
more info.

I hope this help you.

Ciao
Maxximo










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