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Date: Thu, 31 May 2001 21:22:30 +0200
From: Theo van Klaveren <t.vanklaveren@student.utwente.nl>
To: freebsd-questions@freebsd.org
Subject: SU and PTYs
Message-ID: <20010531212230.A10596@phoenix.student.utwente.nl>
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Hi,

I'm trying to let a program get super-user rights by calling su in a
pseudo-terminal (the attached program demonstrates this). This however does not
work, because su gets stuck in ttywait.

Can anyone tell me what I'm doing wrong, or at least provide me with a program
that does do the trick?

Thanks in advance,
Theo

P.S. Please reply to me directly. I am not subscribed.

-- 
Theo van Klaveren <t.vanklaveren@student.utwente.nl>
http://home.student.utwente.nl/t.vanklaveren

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#include <stdlib.h>
#include <sys/types.h>
#include <libutil.h>
#include <stdio.h>
#include <unistd.h>

int
main (int argc, char **argv)
{
	int fd, fds;
	pid_t pid;

	if ((pid = forkpty(&fd, NULL, NULL, NULL)) < 0) {
		perror ("fork");
		exit (-1);
	}

	if (pid > 0) {
		write (fds, "mypasswd\n", strlen("mypasswd\n"));
		waitpid (pid, NULL, 0);
		_exit(0);
	} else {
		execlp ("su", "su", NULL);
	}

}

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