Re: su: Cannot drop the controlling terminal

On Fri, 2024-12-13 at 15:00 -0600, Bruce Dubbs wrote:
> On 12/13/24 12:54, "Ray" ([email protected] via lfs-support Mailing List) wrote:
> > Hi all,
> > 
> > In the chroot environment I see the following error when trying  to run the
> > tests as the tester user.
> > 
> > su: Cannot drop the controlling terminal

                int err = -1;

#ifdef USE_PAM
                /* When PAM is used, we are on the child */
                err = setsid ();
#else
                /* Otherwise, we cannot use setsid */
                int fd = open ("/dev/tty", O_RDWR);

                if (fd >= 0) {
                        err = ioctl (fd, TIOCNOTTY, (char *) NULL);
                        (void) close (fd);
                } else if (ENXIO == errno) {
                        /* There are no controlling terminal already */
                        err = 0;
                }
#endif                          /* USE_PAM */

                if (-1 == err) {
                        (void) fprintf (stderr,
                                        _("%s: Cannot drop the controlling terminal\n"),
                                        Prog);
                        exit (1);
                }

We don't have PAM here, so USE_PAM should be undefined.

Now it looks to me $LFS/dev isn't mounted correctly (so /dev/tty is
unavailable in the chroot).  But IIRC it should already cause some
packages fail to build before the first attempt to use su.


-- 
Xi Ruoyao <[email protected]>
School of Aerospace Science and Technology, Xidian University

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